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IRegistry","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"newVotingPower","type":"uint256"}],"name":"removeVotesWhenRevokingDelegatedVotes","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"hash","type":"bytes32"}],"name":"resetHotFixRecord","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"lesser","type":"uint256"},{"internalType":"uint256","name":"greater","type":"uint256"}],"name":"revokeUpvote","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"revokeVotes","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"securityCouncil","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_approver","type":"address"}],"name":"setApprover","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"baselineQuorumFactor","type":"uint256"}],"name":"setBaselineQuorumFactor","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"baselineUpdateFactor","type":"uint256"}],"name":"setBaselineUpdateFactor","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"_concurrentProposals","type":"uint256"}],"name":"setConcurrentProposals","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"destination","type":"address"},{"internalType":"bytes4","name":"functionId","type":"bytes4"},{"internalType":"uint256","name":"threshold","type":"uint256"}],"name":"setConstitution","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"_dequeueFrequency","type":"uint256"}],"name":"setDequeueFrequency","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"executionStageDuration","type":"uint256"}],"name":"setExecutionStageDuration","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"timeWindow","type":"uint256"}],"name":"setHotfixExecutionTimeWindow","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"_minDeposit","type":"uint256"}],"name":"setMinDeposit","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"participationBaseline","type":"uint256"}],"name":"setParticipationBaseline","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"participationFloor","type":"uint256"}],"name":"setParticipationFloor","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"_queueExpiry","type":"uint256"}],"name":"setQueueExpiry","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"referendumStageDuration","type":"uint256"}],"name":"setReferendumStageDuration","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"registryAddress","type":"address"}],"name":"setRegistry","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_council","type":"address"}],"name":"setSecurityCouncil","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"stageDurations","outputs":[{"internalType":"uint256","name":"approval","type":"uint256"},{"internalType":"uint256","name":"referendum","type":"uint256"},{"internalType":"uint256","name":"execution","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"proposalId","type":"uint256"},{"internalType":"uint256","name":"lesser","type":"uint256"},{"internalType":"uint256","name":"greater","type":"uint256"}],"name":"upvote","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"validatorAddressFromCurrentSet","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"validatorSignerAddressFromCurrentSet","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"uint256","name":"index","type":"uint256"},{"internalType":"uint256","name":"blockNumber","type":"uint256"}],"name":"validatorSignerAddressFromSet","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"proposalId","type":"uint256"},{"internalType":"uint256","name":"index","type":"uint256"},{"internalType":"enum Proposals.VoteValue","name":"value","type":"uint8"}],"name":"vote","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"proposalId","type":"uint256"},{"internalType":"uint256","name":"index","type":"uint256"},{"internalType":"uint256","name":"yesVotes","type":"uint256"},{"internalType":"uint256","name":"noVotes","type":"uint256"},{"internalType":"uint256","name":"abstainVotes","type":"uint256"}],"name":"votePartially","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"withdraw","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"}],"conflicting_implementations":null,"certified":false,"additional_sources":[{"file_path":"contracts/common/interfaces/IRegistry.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\ninterface IRegistry {\n function setAddressFor(string calldata, address) external;\n function getAddressForOrDie(bytes32) external view returns (address);\n function getAddressFor(bytes32) external view returns (address);\n function getAddressForStringOrDie(string calldata identifier) external view returns (address);\n function getAddressForString(string calldata identifier) external view returns (address);\n function isOneOf(bytes32[] calldata, address) external view returns (bool);\n}\n"},{"file_path":"contracts/common/interfaces/IFreezer.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\ninterface IFreezer {\n function freeze(address target) external;\n function unfreeze(address target) external;\n function isFrozen(address) external view returns (bool);\n}\n"},{"file_path":"contracts/governance/Proposals.sol","source_code":"pragma solidity ^0.5.13;\n\nimport \"openzeppelin-solidity/contracts/math/SafeMath.sol\";\nimport \"openzeppelin-solidity/contracts/utils/Address.sol\";\nimport \"solidity-bytes-utils/contracts/BytesLib.sol\";\n\nimport \"../common/FixidityLib.sol\";\n\n/**\n * @title A library operating on Celo Governance proposals.\n */\nlibrary Proposals {\n using FixidityLib for FixidityLib.Fraction;\n using SafeMath for uint256;\n using BytesLib for bytes;\n\n enum Stage {\n None,\n Queued,\n Approval,\n Referendum,\n Execution,\n Expiration\n }\n\n enum VoteValue {\n None,\n Abstain,\n No,\n Yes\n }\n\n struct StageDurations {\n uint256 approval;\n uint256 referendum;\n uint256 execution;\n }\n\n struct VoteTotals {\n uint256 yes;\n uint256 no;\n uint256 abstain;\n }\n\n struct Transaction {\n uint256 value;\n address destination;\n bytes data;\n }\n\n struct Proposal {\n address proposer;\n uint256 deposit;\n uint256 timestamp;\n VoteTotals votes;\n Transaction[] transactions;\n bool approved;\n uint256 networkWeight;\n string descriptionUrl;\n }\n\n /**\n * @notice Constructs a proposal.\n * @param proposal The proposal struct to be constructed.\n * @param values The values of CELO to be sent in the proposed transactions.\n * @param destinations The destination addresses of the proposed transactions.\n * @param data The concatenated data to be included in the proposed transactions.\n * @param dataLengths The lengths of each transaction's data.\n * @param proposer The proposer.\n * @param deposit The proposal deposit.\n */\n function make(\n Proposal storage proposal,\n uint256[] memory values,\n address[] memory destinations,\n bytes memory data,\n uint256[] memory dataLengths,\n address proposer,\n uint256 deposit\n ) public {\n require(\n values.length == destinations.length && destinations.length == dataLengths.length,\n \"Array length mismatch\"\n );\n uint256 transactionCount = values.length;\n\n proposal.proposer = proposer;\n proposal.deposit = deposit;\n // solhint-disable-next-line not-rely-on-time\n proposal.timestamp = now;\n\n uint256 dataPosition = 0;\n delete proposal.transactions;\n for (uint256 i = 0; i < transactionCount; i = i.add(1)) {\n proposal.transactions.push(\n Transaction(values[i], destinations[i], data.slice(dataPosition, dataLengths[i]))\n );\n dataPosition = dataPosition.add(dataLengths[i]);\n }\n }\n\n /**\n * @notice Adds or changes a vote on a proposal.\n * @param proposal The proposal struct.\n * @param previousYesVotes The previous yes votes weight.\n * @param previousNoVotes The previous no votes weight.\n * @param previousAbstainVotes The previous abstain votes weight.\n * @param yesVotes The current yes votes weight.\n * @param noVotes The current no votes weight.\n * @param abstainVotes The current abstain votes weight.\n */\n function updateVote(\n Proposal storage proposal,\n uint256 previousYesVotes,\n uint256 previousNoVotes,\n uint256 previousAbstainVotes,\n uint256 yesVotes,\n uint256 noVotes,\n uint256 abstainVotes\n ) public {\n // Subtract previous vote.\n proposal.votes.yes = proposal.votes.yes.sub(previousYesVotes);\n proposal.votes.no = proposal.votes.no.sub(previousNoVotes);\n proposal.votes.abstain = proposal.votes.abstain.sub(previousAbstainVotes);\n\n // Add new vote.\n proposal.votes.yes = proposal.votes.yes.add(yesVotes);\n proposal.votes.no = proposal.votes.no.add(noVotes);\n proposal.votes.abstain = proposal.votes.abstain.add(abstainVotes);\n }\n\n /**\n * @notice Executes the proposal.\n * @param proposal The proposal struct.\n * @dev Reverts if any transaction fails.\n */\n function execute(Proposal storage proposal) public {\n executeTransactions(proposal.transactions);\n }\n\n /**\n * @notice Returns a specified transaction in a proposal.\n * @param proposal The proposal struct.\n * @param index The index of the specified transaction in the proposal's transaction list.\n * @return Transaction value.\n * @return Transaction destination.\n * @return Transaction data.\n */\n function getTransaction(\n Proposal storage proposal,\n uint256 index\n ) public view returns (uint256, address, bytes memory) {\n require(index < proposal.transactions.length, \"getTransaction: bad index\");\n Transaction storage transaction = proposal.transactions[index];\n return (transaction.value, transaction.destination, transaction.data);\n }\n\n function setDescriptionUrl(Proposal storage proposal, string memory descriptionUrl) internal {\n require(bytes(descriptionUrl).length != 0, \"Description url must have non-zero length\");\n proposal.descriptionUrl = descriptionUrl;\n }\n\n /**\n * @notice Executes the proposal.\n * @param proposal The proposal struct.\n * @dev Reverts if any transaction fails.\n */\n function executeMem(Proposal memory proposal) internal {\n executeTransactions(proposal.transactions);\n }\n\n /**\n * @notice Executes a list of transactions.\n * @param transactions The transactions to execute.\n */\n function executeTransactions(Transaction[] memory transactions) internal {\n for (uint256 i = 0; i < transactions.length; i = i.add(1)) {\n require(\n externalCall(\n transactions[i].destination,\n transactions[i].value,\n transactions[i].data.length,\n transactions[i].data\n ),\n \"Proposal execution failed\"\n );\n }\n }\n\n /**\n * @notice Computes the support ratio for a proposal with the quorum condition:\n * If the total number of votes (yes + no + abstain) is less than the required number of votes,\n * \"no\" votes are added to increase particiption to this level. The ratio of yes / (yes + no)\n * votes is returned.\n * @param proposal The proposal struct.\n * @param quorum The minimum participation at which \"no\" votes are not added.\n * @return The support ratio with the quorum condition.\n */\n function getSupportWithQuorumPadding(\n Proposal storage proposal,\n FixidityLib.Fraction memory quorum\n ) internal view returns (FixidityLib.Fraction memory) {\n uint256 yesVotes = proposal.votes.yes;\n if (yesVotes == 0) {\n return FixidityLib.newFixed(0);\n }\n uint256 noVotes = proposal.votes.no;\n uint256 totalVotes = yesVotes.add(noVotes).add(proposal.votes.abstain);\n uint256 requiredVotes = quorum\n .multiply(FixidityLib.newFixed(proposal.networkWeight))\n .fromFixed();\n if (requiredVotes > totalVotes) {\n noVotes = noVotes.add(requiredVotes.sub(totalVotes));\n }\n return FixidityLib.newFixedFraction(yesVotes, yesVotes.add(noVotes));\n }\n\n /**\n * @notice Constructs a proposal for use in memory.\n * @param values The values of CELO to be sent in the proposed transactions.\n * @param destinations The destination addresses of the proposed transactions.\n * @param data The concatenated data to be included in the proposed transactions.\n * @param dataLengths The lengths of each transaction's data.\n * @param proposer The proposer.\n * @param deposit The proposal deposit.\n * @return The constructed proposal struct.\n */\n function makeMem(\n uint256[] memory values,\n address[] memory destinations,\n bytes memory data,\n uint256[] memory dataLengths,\n address proposer,\n uint256 deposit\n ) internal view returns (Proposal memory) {\n require(\n values.length == destinations.length && destinations.length == dataLengths.length,\n \"Array length mismatch\"\n );\n uint256 transactionCount = values.length;\n\n Proposal memory proposal;\n proposal.proposer = proposer;\n proposal.deposit = deposit;\n // solhint-disable-next-line not-rely-on-time\n proposal.timestamp = now;\n\n uint256 dataPosition = 0;\n proposal.transactions = new Transaction[](transactionCount);\n for (uint256 i = 0; i < transactionCount; i = i.add(1)) {\n proposal.transactions[i] = Transaction(\n values[i],\n destinations[i],\n data.slice(dataPosition, dataLengths[i])\n );\n dataPosition = dataPosition.add(dataLengths[i]);\n }\n return proposal;\n }\n\n /**\n * @notice Returns the number of votes cast on the proposal over the total number\n * of votes in the network as a fraction.\n * @param proposal The proposal struct.\n * @return The participation of the proposal.\n */\n function getParticipation(\n Proposal storage proposal\n ) internal view returns (FixidityLib.Fraction memory) {\n uint256 totalVotes = proposal.votes.yes.add(proposal.votes.no).add(proposal.votes.abstain);\n return FixidityLib.newFixedFraction(totalVotes, proposal.networkWeight);\n }\n\n /**\n * @notice Returns an unpacked proposal struct with its transaction count.\n * @param proposal The proposal struct.\n * @return proposer\n * @return deposit\n * @return timestamp\n * @return transaction Transaction count.\n * @return description Description url.\n * @return networkWeight Network weight.\n * @return Approval status.\n */\n function unpack(\n Proposal storage proposal\n ) internal view returns (address, uint256, uint256, uint256, string storage, uint256, bool) {\n return (\n proposal.proposer,\n proposal.deposit,\n proposal.timestamp,\n proposal.transactions.length,\n proposal.descriptionUrl,\n proposal.networkWeight,\n proposal.approved\n );\n }\n\n /**\n * @notice Returns the referendum vote totals for a proposal.\n * @param proposal The proposal struct.\n * @return The yes vote totals.\n * @return The no vote totals.\n * @return The abstain vote totals.\n */\n function getVoteTotals(\n Proposal storage proposal\n ) internal view returns (uint256, uint256, uint256) {\n return (proposal.votes.yes, proposal.votes.no, proposal.votes.abstain);\n }\n\n /**\n * @notice Returns whether or not a proposal has been approved.\n * @param proposal The proposal struct.\n * @return Whether or not the proposal has been approved.\n */\n function isApproved(Proposal storage proposal) internal view returns (bool) {\n return proposal.approved;\n }\n\n /**\n * @notice Returns whether or not a proposal exists.\n * @param proposal The proposal struct.\n * @return Whether or not the proposal exists.\n */\n function exists(Proposal storage proposal) internal view returns (bool) {\n return proposal.timestamp > 0;\n }\n\n // call has been separated into its own function in order to take advantage\n // of the Solidity's code generator to produce a loop that copies tx.data into memory.\n /**\n * @notice Executes a function call.\n * @param value The value of CELO to be sent with the function call.\n * @param destination The destination address of the function call.\n * @param dataLength The length of the data to be included in the function call.\n * @param data The data to be included in the function call.\n */\n function externalCall(\n address destination,\n uint256 value,\n uint256 dataLength,\n bytes memory data\n ) private returns (bool) {\n bool result;\n\n if (dataLength > 0) require(Address.isContract(destination), \"Invalid contract address\");\n\n /* solhint-disable no-inline-assembly */\n assembly {\n /* solhint-disable max-line-length */\n let x := mload(0x40) // \"Allocate\" memory for output (0x40 is where \"free memory\" pointer is stored by convention)\n let d := add(data, 32) // First 32 bytes are the padded length of data, so exclude that\n result := call(\n sub(gas, 34710), // 34710 is the value that solidity is currently emitting\n // It includes callGas (700) + callVeryLow (3, to pay for SUB) + callValueTransferGas (9000) +\n // callNewAccountGas (25000, in case the destination address does not exist and needs creating)\n destination,\n value,\n d,\n dataLength, // Size of the input (in bytes) - this is what fixes the padding problem\n x,\n 0 // Output is ignored, therefore the output size is zero\n )\n /* solhint-enable max-line-length */\n }\n /* solhint-enable no-inline-assembly */\n return result;\n }\n}\n"},{"file_path":"lib/openzeppelin-contracts/contracts/GSN/Context.sol","source_code":"pragma solidity ^0.5.0;\n\n/*\n * @dev Provides information about the current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg.data, they should not be accessed in such a direct\n * manner, since when dealing with GSN meta-transactions the account sending and\n * paying for execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, library-like contracts.\n */\ncontract Context {\n // Empty internal constructor, to prevent people from mistakenly deploying\n // an instance of this contract, which should be used via inheritance.\n constructor () internal { }\n // solhint-disable-previous-line no-empty-blocks\n\n function _msgSender() internal view returns (address payable) {\n return msg.sender;\n }\n\n function _msgData() internal view returns (bytes memory) {\n this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691\n return msg.data;\n }\n}\n"},{"file_path":"contracts/governance/interfaces/IGovernance.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\ninterface IGovernance {\n // constitution\n function setConstitution(address destination, bytes4 functionId, uint256 threshold) external;\n function getConstitution(address destination, bytes4 functionId) external view returns (uint256);\n\n // proposal\n function propose(\n uint256[] calldata values,\n address[] calldata destinations,\n bytes calldata data,\n uint256[] calldata dataLengths,\n string calldata descriptionUrl\n ) external payable returns (uint256);\n function getProposal(\n uint256 proposalId\n ) external view returns (address, uint256, uint256, uint256, string memory, uint256, bool);\n function proposalCount() external view returns (uint256);\n\n // upvote\n function upvote(uint256 proposalId, uint256 lesser, uint256 greater) external returns (bool);\n function getUpvotes(uint256 proposalId) external view returns (uint256);\n\n // approve\n function approve(uint256 proposalId, uint256 index) external returns (bool);\n function isApproved(uint256 proposalId) external view returns (bool);\n\n // voting\n // TODO: Enable once we migrate out of 0.5\n // function vote(\n // uint256 proposalId,\n // uint256 index,\n // Proposals.VoteValue value\n // ) external returns (bool);\n function votePartially(\n uint256 proposalId,\n uint256 index,\n uint256 yesVotes,\n uint256 noVotes,\n uint256 abstainVotes\n ) external returns (bool);\n function removeVotesWhenRevokingDelegatedVotes(\n address account,\n uint256 maxAmountAllowed\n ) external;\n function isVoting(address account) external view returns (bool);\n function getVoteTotals(uint256 proposalId) external view returns (uint256, uint256, uint256);\n function getAmountOfGoldUsedForVoting(address account) external view returns (uint256);\n\n // referendum\n function getReferendumStageDuration() external view returns (uint256);\n\n // execution\n function execute(uint256 proposalId, uint256 index) external returns (bool);\n}\n"},{"file_path":"lib/openzeppelin-contracts/contracts/math/Math.sol","source_code":"pragma solidity ^0.5.0;\n\n/**\n * @dev Standard math utilities missing in the Solidity language.\n */\nlibrary Math {\n /**\n * @dev Returns the largest of two numbers.\n */\n function max(uint256 a, uint256 b) internal pure returns (uint256) {\n return a >= b ? a : b;\n }\n\n /**\n * @dev Returns the smallest of two numbers.\n */\n function min(uint256 a, uint256 b) internal pure returns (uint256) {\n return a < b ? a : b;\n }\n\n /**\n * @dev Returns the average of two numbers. The result is rounded towards\n * zero.\n */\n function average(uint256 a, uint256 b) internal pure returns (uint256) {\n // (a + b) / 2 can overflow, so we distribute\n return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);\n }\n}\n"},{"file_path":"contracts/common/linkedlists/SortedLinkedList.sol","source_code":"pragma solidity ^0.5.13;\n\nimport \"openzeppelin-solidity/contracts/math/SafeMath.sol\";\nimport \"./LinkedList.sol\";\n\n/**\n * @title Maintains a sorted list of unsigned ints keyed by bytes32.\n */\nlibrary SortedLinkedList {\n using SafeMath for uint256;\n using LinkedList for LinkedList.List;\n\n struct List {\n LinkedList.List list;\n mapping(bytes32 => uint256) values;\n }\n\n /**\n * @notice Inserts an element into a doubly linked list.\n * @param list A storage pointer to the underlying list.\n * @param key The key of the element to insert.\n * @param value The element value.\n * @param lesserKey The key of the element less than the element to insert.\n * @param greaterKey The key of the element greater than the element to insert.\n */\n function insert(\n List storage list,\n bytes32 key,\n uint256 value,\n bytes32 lesserKey,\n bytes32 greaterKey\n ) internal {\n require(\n key != bytes32(0) && key != lesserKey && key != greaterKey && !contains(list, key),\n \"invalid key\"\n );\n require(\n (lesserKey != bytes32(0) || greaterKey != bytes32(0)) || list.list.numElements == 0,\n \"greater and lesser key zero\"\n );\n require(contains(list, lesserKey) || lesserKey == bytes32(0), \"invalid lesser key\");\n require(contains(list, greaterKey) || greaterKey == bytes32(0), \"invalid greater key\");\n (lesserKey, greaterKey) = getLesserAndGreater(list, value, lesserKey, greaterKey);\n list.list.insert(key, lesserKey, greaterKey);\n list.values[key] = value;\n }\n\n /**\n * @notice Removes an element from the doubly linked list.\n * @param list A storage pointer to the underlying list.\n * @param key The key of the element to remove.\n */\n function remove(List storage list, bytes32 key) internal {\n list.list.remove(key);\n list.values[key] = 0;\n }\n\n /**\n * @notice Updates an element in the list.\n * @param list A storage pointer to the underlying list.\n * @param key The element key.\n * @param value The element value.\n * @param lesserKey The key of the element will be just left of `key` after the update.\n * @param greaterKey The key of the element will be just right of `key` after the update.\n * @dev Note that only one of \"lesserKey\" or \"greaterKey\" needs to be correct to reduce friction.\n */\n function update(\n List storage list,\n bytes32 key,\n uint256 value,\n bytes32 lesserKey,\n bytes32 greaterKey\n ) internal {\n require(contains(list, key), \"key not in list\");\n require(key != bytes32(0) && key != lesserKey && key != greaterKey, \"invalid key\");\n require(\n (lesserKey != bytes32(0) || greaterKey != bytes32(0)) || list.list.numElements == 1,\n \"greater and lesser key zero\"\n );\n\n bytes32 oldLesserKey = list.list.elements[key].previousKey;\n bytes32 oldGreaterKey = list.list.elements[key].nextKey;\n\n if (isValueBetween(list, value, oldLesserKey, oldGreaterKey)) {\n list.values[key] = value;\n } else {\n remove(list, key);\n insert(list, key, value, lesserKey, greaterKey);\n }\n }\n\n /**\n * @notice Inserts an element at the tail of the doubly linked list.\n * @param list A storage pointer to the underlying list.\n * @param key The key of the element to insert.\n */\n function push(List storage list, bytes32 key) internal {\n insert(list, key, 0, bytes32(0), list.list.tail);\n }\n\n /**\n * @notice Removes N elements from the head of the list and returns their keys.\n * @param list A storage pointer to the underlying list.\n * @param n The number of elements to pop.\n * @return The keys of the popped elements.\n */\n function popN(List storage list, uint256 n) internal returns (bytes32[] memory) {\n require(n <= list.list.numElements, \"not enough elements\");\n bytes32[] memory keys = new bytes32[](n);\n for (uint256 i = 0; i < n; i = i.add(1)) {\n bytes32 key = list.list.head;\n keys[i] = key;\n remove(list, key);\n }\n return keys;\n }\n\n /**\n * @notice Returns whether or not a particular key is present in the sorted list.\n * @param list A storage pointer to the underlying list.\n * @param key The element key.\n * @return Whether or not the key is in the sorted list.\n */\n function contains(List storage list, bytes32 key) internal view returns (bool) {\n return list.list.contains(key);\n }\n\n /**\n * @notice Returns the value for a particular key in the sorted list.\n * @param list A storage pointer to the underlying list.\n * @param key The element key.\n * @return The element value.\n */\n function getValue(List storage list, bytes32 key) internal view returns (uint256) {\n return list.values[key];\n }\n\n /**\n * @notice Gets all elements from the doubly linked list.\n * @param list A storage pointer to the underlying list.\n * @return Array of all keys in the list.\n * @return Values corresponding to keys, which will be ordered largest to smallest.\n */\n function getElements(\n List storage list\n ) internal view returns (bytes32[] memory, uint256[] memory) {\n bytes32[] memory keys = getKeys(list);\n uint256[] memory values = new uint256[](keys.length);\n for (uint256 i = 0; i < keys.length; i = i.add(1)) {\n values[i] = list.values[keys[i]];\n }\n return (keys, values);\n }\n\n /**\n * @notice Gets all element keys from the doubly linked list.\n * @param list A storage pointer to the underlying list.\n * @return All element keys from head to tail.\n */\n function getKeys(List storage list) internal view returns (bytes32[] memory) {\n return list.list.getKeys();\n }\n\n /**\n * @notice Returns first N greatest elements of the list.\n * @param list A storage pointer to the underlying list.\n * @param n The number of elements to return.\n * @return The keys of the first n elements.\n * @dev Reverts if n is greater than the number of elements in the list.\n */\n function headN(List storage list, uint256 n) internal view returns (bytes32[] memory) {\n return list.list.headN(n);\n }\n\n /**\n * @notice Returns the keys of the elements greaterKey than and less than the provided value.\n * @param list A storage pointer to the underlying list.\n * @param value The element value.\n * @param lesserKey The key of the element which could be just left of the new value.\n * @param greaterKey The key of the element which could be just right of the new value.\n * @return The correct lesserKey keys.\n * @return The correct greaterKey keys.\n */\n function getLesserAndGreater(\n List storage list,\n uint256 value,\n bytes32 lesserKey,\n bytes32 greaterKey\n ) private view returns (bytes32, bytes32) {\n // Check for one of the following conditions and fail if none are met:\n // 1. The value is less than the current lowest value\n // 2. The value is greater than the current greatest value\n // 3. The value is just greater than the value for `lesserKey`\n // 4. The value is just less than the value for `greaterKey`\n if (lesserKey == bytes32(0) && isValueBetween(list, value, lesserKey, list.list.tail)) {\n return (lesserKey, list.list.tail);\n } else if (\n greaterKey == bytes32(0) && isValueBetween(list, value, list.list.head, greaterKey)\n ) {\n return (list.list.head, greaterKey);\n } else if (\n lesserKey != bytes32(0) &&\n isValueBetween(list, value, lesserKey, list.list.elements[lesserKey].nextKey)\n ) {\n return (lesserKey, list.list.elements[lesserKey].nextKey);\n } else if (\n greaterKey != bytes32(0) &&\n isValueBetween(list, value, list.list.elements[greaterKey].previousKey, greaterKey)\n ) {\n return (list.list.elements[greaterKey].previousKey, greaterKey);\n } else {\n require(false, \"get lesser and greater failure\");\n }\n }\n\n /**\n * @notice Returns whether or not a given element is between two other elements.\n * @param list A storage pointer to the underlying list.\n * @param value The element value.\n * @param lesserKey The key of the element whose value should be lesserKey.\n * @param greaterKey The key of the element whose value should be greaterKey.\n * @return True if the given element is between the two other elements.\n */\n function isValueBetween(\n List storage list,\n uint256 value,\n bytes32 lesserKey,\n bytes32 greaterKey\n ) private view returns (bool) {\n bool isLesser = lesserKey == bytes32(0) || list.values[lesserKey] <= value;\n bool isGreater = greaterKey == bytes32(0) || list.values[greaterKey] >= value;\n return isLesser && isGreater;\n }\n}\n"},{"file_path":"contracts/common/linkedlists/IntegerSortedLinkedList.sol","source_code":"pragma solidity ^0.5.13;\n\nimport \"openzeppelin-solidity/contracts/math/SafeMath.sol\";\n\nimport \"./SortedLinkedList.sol\";\n\n/**\n * @title Maintains a sorted list of unsigned ints keyed by uint256.\n */\nlibrary IntegerSortedLinkedList {\n using SafeMath for uint256;\n using SortedLinkedList for SortedLinkedList.List;\n\n /**\n * @notice Inserts an element into a doubly linked list.\n * @param list A storage pointer to the underlying list.\n * @param key The key of the element to insert.\n * @param value The element value.\n * @param lesserKey The key of the element less than the element to insert.\n * @param greaterKey The key of the element greater than the element to insert.\n */\n function insert(\n SortedLinkedList.List storage list,\n uint256 key,\n uint256 value,\n uint256 lesserKey,\n uint256 greaterKey\n ) public {\n list.insert(bytes32(key), value, bytes32(lesserKey), bytes32(greaterKey));\n }\n\n /**\n * @notice Removes an element from the doubly linked list.\n * @param list A storage pointer to the underlying list.\n * @param key The key of the element to remove.\n */\n function remove(SortedLinkedList.List storage list, uint256 key) public {\n list.remove(bytes32(key));\n }\n\n /**\n * @notice Updates an element in the list.\n * @param list A storage pointer to the underlying list.\n * @param key The element key.\n * @param value The element value.\n * @param lesserKey The key of the element will be just left of `key` after the update.\n * @param greaterKey The key of the element will be just right of `key` after the update.\n * @dev Note that only one of \"lesserKey\" or \"greaterKey\" needs to be correct to reduce friction.\n */\n function update(\n SortedLinkedList.List storage list,\n uint256 key,\n uint256 value,\n uint256 lesserKey,\n uint256 greaterKey\n ) public {\n list.update(bytes32(key), value, bytes32(lesserKey), bytes32(greaterKey));\n }\n\n /**\n * @notice Inserts an element at the end of the doubly linked list.\n * @param list A storage pointer to the underlying list.\n * @param key The key of the element to insert.\n */\n function push(SortedLinkedList.List storage list, uint256 key) public {\n list.push(bytes32(key));\n }\n\n /**\n * @notice Removes N elements from the head of the list and returns their keys.\n * @param list A storage pointer to the underlying list.\n * @param n The number of elements to pop.\n * @return The keys of the popped elements.\n */\n function popN(SortedLinkedList.List storage list, uint256 n) public returns (uint256[] memory) {\n bytes32[] memory byteKeys = list.popN(n);\n uint256[] memory keys = new uint256[](byteKeys.length);\n for (uint256 i = 0; i < byteKeys.length; i = i.add(1)) {\n keys[i] = uint256(byteKeys[i]);\n }\n return keys;\n }\n\n /**\n * @notice Returns whether or not a particular key is present in the sorted list.\n * @param list A storage pointer to the underlying list.\n * @param key The element key.\n * @return Whether or not the key is in the sorted list.\n */\n function contains(SortedLinkedList.List storage list, uint256 key) public view returns (bool) {\n return list.contains(bytes32(key));\n }\n\n /**\n * @notice Returns the value for a particular key in the sorted list.\n * @param list A storage pointer to the underlying list.\n * @param key The element key.\n * @return The element value.\n */\n function getValue(SortedLinkedList.List storage list, uint256 key) public view returns (uint256) {\n return list.getValue(bytes32(key));\n }\n\n /**\n * @notice Gets all elements from the doubly linked list.\n * @param list A storage pointer to the underlying list.\n * @return Array of all keys in the list.\n * @return Values corresponding to keys, which will be ordered largest to smallest.\n */\n function getElements(\n SortedLinkedList.List storage list\n ) public view returns (uint256[] memory, uint256[] memory) {\n bytes32[] memory byteKeys = list.getKeys();\n uint256[] memory keys = new uint256[](byteKeys.length);\n uint256[] memory values = new uint256[](byteKeys.length);\n for (uint256 i = 0; i < byteKeys.length; i = i.add(1)) {\n keys[i] = uint256(byteKeys[i]);\n values[i] = list.values[byteKeys[i]];\n }\n return (keys, values);\n }\n}\n"},{"file_path":"contracts/identity/interfaces/IRandom.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\ninterface IRandom {\n function revealAndCommit(bytes32, bytes32, address) external;\n function randomnessBlockRetentionWindow() external view returns (uint256);\n function random() external view returns (bytes32);\n function getBlockRandomness(uint256) external view returns (bytes32);\n}\n"},{"file_path":"lib/mento-core/contracts/interfaces/IReserve.sol","source_code":"pragma solidity ^0.5.13;\n\ninterface IReserve {\n function setTobinTaxStalenessThreshold(uint256) external;\n\n function addToken(address) external returns (bool);\n\n function removeToken(address, uint256) external returns (bool);\n\n function transferGold(address payable, uint256) external returns (bool);\n\n function transferExchangeGold(address payable, uint256) external returns (bool);\n\n function getReserveGoldBalance() external view returns (uint256);\n\n function getUnfrozenReserveGoldBalance() external view returns (uint256);\n\n function getOrComputeTobinTax() external returns (uint256, uint256);\n\n function getTokens() external view returns (address[] memory);\n\n function getReserveRatio() external view returns (uint256);\n\n function addExchangeSpender(address) external;\n\n function removeExchangeSpender(address, uint256) external;\n\n function addSpender(address) external;\n\n function removeSpender(address) external;\n}\n"},{"file_path":"contracts/governance/interfaces/IEpochRewards.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\ninterface IEpochRewards {\n function updateTargetVotingYield() external;\n function calculateTargetEpochRewards() external view returns (uint256, uint256, uint256, uint256);\n function getTargetVotingYieldParameters() external view returns (uint256, uint256, uint256);\n function getRewardsMultiplierParameters() external view returns (uint256, uint256, uint256);\n function getCommunityRewardFraction() external view returns (uint256);\n function getCarbonOffsettingFraction() external view returns (uint256);\n function getTargetVotingGoldFraction() external view returns (uint256);\n function getRewardsMultiplier() external view returns (uint256);\n function carbonOffsettingPartner() external view returns (address);\n}\n"},{"file_path":"lib/solidity-bytes-utils/contracts/BytesLib.sol","source_code":"/*\n * @title Solidity Bytes Arrays Utils\n * @author Gonçalo Sá \n *\n * @dev Bytes tightly packed arrays utility library for ethereum contracts written in Solidity.\n * The library lets you concatenate, slice and type cast bytes arrays both in memory and storage.\n */\n\npragma solidity ^0.5.0;\n\n\nlibrary BytesLib {\n function concat(\n bytes memory _preBytes,\n bytes memory _postBytes\n )\n internal\n pure\n returns (bytes memory)\n {\n bytes memory tempBytes;\n\n assembly {\n // Get a location of some free memory and store it in tempBytes as\n // Solidity does for memory variables.\n tempBytes := mload(0x40)\n\n // Store the length of the first bytes array at the beginning of\n // the memory for tempBytes.\n let length := mload(_preBytes)\n mstore(tempBytes, length)\n\n // Maintain a memory counter for the current write location in the\n // temp bytes array by adding the 32 bytes for the array length to\n // the starting location.\n let mc := add(tempBytes, 0x20)\n // Stop copying when the memory counter reaches the length of the\n // first bytes array.\n let end := add(mc, length)\n\n for {\n // Initialize a copy counter to the start of the _preBytes data,\n // 32 bytes into its memory.\n let cc := add(_preBytes, 0x20)\n } lt(mc, end) {\n // Increase both counters by 32 bytes each iteration.\n mc := add(mc, 0x20)\n cc := add(cc, 0x20)\n } {\n // Write the _preBytes data into the tempBytes memory 32 bytes\n // at a time.\n mstore(mc, mload(cc))\n }\n\n // Add the length of _postBytes to the current length of tempBytes\n // and store it as the new length in the first 32 bytes of the\n // tempBytes memory.\n length := mload(_postBytes)\n mstore(tempBytes, add(length, mload(tempBytes)))\n\n // Move the memory counter back from a multiple of 0x20 to the\n // actual end of the _preBytes data.\n mc := end\n // Stop copying when the memory counter reaches the new combined\n // length of the arrays.\n end := add(mc, length)\n\n for {\n let cc := add(_postBytes, 0x20)\n } lt(mc, end) {\n mc := add(mc, 0x20)\n cc := add(cc, 0x20)\n } {\n mstore(mc, mload(cc))\n }\n\n // Update the free-memory pointer by padding our last write location\n // to 32 bytes: add 31 bytes to the end of tempBytes to move to the\n // next 32 byte block, then round down to the nearest multiple of\n // 32. If the sum of the length of the two arrays is zero then add \n // one before rounding down to leave a blank 32 bytes (the length block with 0).\n mstore(0x40, and(\n add(add(end, iszero(add(length, mload(_preBytes)))), 31),\n not(31) // Round down to the nearest 32 bytes.\n ))\n }\n\n return tempBytes;\n }\n\n function concatStorage(bytes storage _preBytes, bytes memory _postBytes) internal {\n assembly {\n // Read the first 32 bytes of _preBytes storage, which is the length\n // of the array. (We don't need to use the offset into the slot\n // because arrays use the entire slot.)\n let fslot := sload(_preBytes_slot)\n // Arrays of 31 bytes or less have an even value in their slot,\n // while longer arrays have an odd value. The actual length is\n // the slot divided by two for odd values, and the lowest order\n // byte divided by two for even values.\n // If the slot is even, bitwise and the slot with 255 and divide by\n // two to get the length. If the slot is odd, bitwise and the slot\n // with -1 and divide by two.\n let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2)\n let mlength := mload(_postBytes)\n let newlength := add(slength, mlength)\n // slength can contain both the length and contents of the array\n // if length < 32 bytes so let's prepare for that\n // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage\n switch add(lt(slength, 32), lt(newlength, 32))\n case 2 {\n // Since the new array still fits in the slot, we just need to\n // update the contents of the slot.\n // uint256(bytes_storage) = uint256(bytes_storage) + uint256(bytes_memory) + new_length\n sstore(\n _preBytes_slot,\n // all the modifications to the slot are inside this\n // next block\n add(\n // we can just add to the slot contents because the\n // bytes we want to change are the LSBs\n fslot,\n add(\n mul(\n div(\n // load the bytes from memory\n mload(add(_postBytes, 0x20)),\n // zero all bytes to the right\n exp(0x100, sub(32, mlength))\n ),\n // and now shift left the number of bytes to\n // leave space for the length in the slot\n exp(0x100, sub(32, newlength))\n ),\n // increase length by the double of the memory\n // bytes length\n mul(mlength, 2)\n )\n )\n )\n }\n case 1 {\n // The stored value fits in the slot, but the combined value\n // will exceed it.\n // get the keccak hash to get the contents of the array\n mstore(0x0, _preBytes_slot)\n let sc := add(keccak256(0x0, 0x20), div(slength, 32))\n\n // save new length\n sstore(_preBytes_slot, add(mul(newlength, 2), 1))\n\n // The contents of the _postBytes array start 32 bytes into\n // the structure. Our first read should obtain the `submod`\n // bytes that can fit into the unused space in the last word\n // of the stored array. To get this, we read 32 bytes starting\n // from `submod`, so the data we read overlaps with the array\n // contents by `submod` bytes. Masking the lowest-order\n // `submod` bytes allows us to add that value directly to the\n // stored value.\n\n let submod := sub(32, slength)\n let mc := add(_postBytes, submod)\n let end := add(_postBytes, mlength)\n let mask := sub(exp(0x100, submod), 1)\n\n sstore(\n sc,\n add(\n and(\n fslot,\n 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00\n ),\n and(mload(mc), mask)\n )\n )\n\n for {\n mc := add(mc, 0x20)\n sc := add(sc, 1)\n } lt(mc, end) {\n sc := add(sc, 1)\n mc := add(mc, 0x20)\n } {\n sstore(sc, mload(mc))\n }\n\n mask := exp(0x100, sub(mc, end))\n\n sstore(sc, mul(div(mload(mc), mask), mask))\n }\n default {\n // get the keccak hash to get the contents of the array\n mstore(0x0, _preBytes_slot)\n // Start copying to the last used word of the stored array.\n let sc := add(keccak256(0x0, 0x20), div(slength, 32))\n\n // save new length\n sstore(_preBytes_slot, add(mul(newlength, 2), 1))\n\n // Copy over the first `submod` bytes of the new data as in\n // case 1 above.\n let slengthmod := mod(slength, 32)\n let mlengthmod := mod(mlength, 32)\n let submod := sub(32, slengthmod)\n let mc := add(_postBytes, submod)\n let end := add(_postBytes, mlength)\n let mask := sub(exp(0x100, submod), 1)\n\n sstore(sc, add(sload(sc), and(mload(mc), mask)))\n \n for { \n sc := add(sc, 1)\n mc := add(mc, 0x20)\n } lt(mc, end) {\n sc := add(sc, 1)\n mc := add(mc, 0x20)\n } {\n sstore(sc, mload(mc))\n }\n\n mask := exp(0x100, sub(mc, end))\n\n sstore(sc, mul(div(mload(mc), mask), mask))\n }\n }\n }\n\n function slice(\n bytes memory _bytes,\n uint _start,\n uint _length\n )\n internal\n pure\n returns (bytes memory)\n {\n require(_bytes.length >= (_start + _length));\n\n bytes memory tempBytes;\n\n assembly {\n switch iszero(_length)\n case 0 {\n // Get a location of some free memory and store it in tempBytes as\n // Solidity does for memory variables.\n tempBytes := mload(0x40)\n\n // The first word of the slice result is potentially a partial\n // word read from the original array. To read it, we calculate\n // the length of that partial word and start copying that many\n // bytes into the array. The first word we copy will start with\n // data we don't care about, but the last `lengthmod` bytes will\n // land at the beginning of the contents of the new array. When\n // we're done copying, we overwrite the full first word with\n // the actual length of the slice.\n let lengthmod := and(_length, 31)\n\n // The multiplication in the next line is necessary\n // because when slicing multiples of 32 bytes (lengthmod == 0)\n // the following copy loop was copying the origin's length\n // and then ending prematurely not copying everything it should.\n let mc := add(add(tempBytes, lengthmod), mul(0x20, iszero(lengthmod)))\n let end := add(mc, _length)\n\n for {\n // The multiplication in the next line has the same exact purpose\n // as the one above.\n let cc := add(add(add(_bytes, lengthmod), mul(0x20, iszero(lengthmod))), _start)\n } lt(mc, end) {\n mc := add(mc, 0x20)\n cc := add(cc, 0x20)\n } {\n mstore(mc, mload(cc))\n }\n\n mstore(tempBytes, _length)\n\n //update free-memory pointer\n //allocating the array padded to 32 bytes like the compiler does now\n mstore(0x40, and(add(mc, 31), not(31)))\n }\n //if we want a zero-length slice let's just return a zero-length array\n default {\n tempBytes := mload(0x40)\n\n mstore(0x40, add(tempBytes, 0x20))\n }\n }\n\n return tempBytes;\n }\n\n function toAddress(bytes memory _bytes, uint _start) internal pure returns (address) {\n require(_bytes.length >= (_start + 20));\n address tempAddress;\n\n assembly {\n tempAddress := div(mload(add(add(_bytes, 0x20), _start)), 0x1000000000000000000000000)\n }\n\n return tempAddress;\n }\n\n function toUint8(bytes memory _bytes, uint _start) internal pure returns (uint8) {\n require(_bytes.length >= (_start + 1));\n uint8 tempUint;\n\n assembly {\n tempUint := mload(add(add(_bytes, 0x1), _start))\n }\n\n return tempUint;\n }\n\n function toUint16(bytes memory _bytes, uint _start) internal pure returns (uint16) {\n require(_bytes.length >= (_start + 2));\n uint16 tempUint;\n\n assembly {\n tempUint := mload(add(add(_bytes, 0x2), _start))\n }\n\n return tempUint;\n }\n\n function toUint32(bytes memory _bytes, uint _start) internal pure returns (uint32) {\n require(_bytes.length >= (_start + 4));\n uint32 tempUint;\n\n assembly {\n tempUint := mload(add(add(_bytes, 0x4), _start))\n }\n\n return tempUint;\n }\n\n function toUint(bytes memory _bytes, uint _start) internal pure returns (uint256) {\n require(_bytes.length >= (_start + 32));\n uint256 tempUint;\n\n assembly {\n tempUint := mload(add(add(_bytes, 0x20), _start))\n }\n\n return tempUint;\n }\n\n function toBytes32(bytes memory _bytes, uint _start) internal pure returns (bytes32) {\n require(_bytes.length >= (_start + 32));\n bytes32 tempBytes32;\n\n assembly {\n tempBytes32 := mload(add(add(_bytes, 0x20), _start))\n }\n\n return tempBytes32;\n }\n\n function equal(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bool) {\n bool success = true;\n\n assembly {\n let length := mload(_preBytes)\n\n // if lengths don't match the arrays are not equal\n switch eq(length, mload(_postBytes))\n case 1 {\n // cb is a circuit breaker in the for loop since there's\n // no said feature for inline assembly loops\n // cb = 1 - don't breaker\n // cb = 0 - break\n let cb := 1\n\n let mc := add(_preBytes, 0x20)\n let end := add(mc, length)\n\n for {\n let cc := add(_postBytes, 0x20)\n // the next line is the loop condition:\n // while(uint(mc < end) + cb == 2)\n } eq(add(lt(mc, end), cb), 2) {\n mc := add(mc, 0x20)\n cc := add(cc, 0x20)\n } {\n // if any of these checks fails then arrays are not equal\n if iszero(eq(mload(mc), mload(cc))) {\n // unsuccess:\n success := 0\n cb := 0\n }\n }\n }\n default {\n // unsuccess:\n success := 0\n }\n }\n\n return success;\n }\n\n function equalStorage(\n bytes storage _preBytes,\n bytes memory _postBytes\n )\n internal\n view\n returns (bool)\n {\n bool success = true;\n\n assembly {\n // we know _preBytes_offset is 0\n let fslot := sload(_preBytes_slot)\n // Decode the length of the stored array like in concatStorage().\n let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2)\n let mlength := mload(_postBytes)\n\n // if lengths don't match the arrays are not equal\n switch eq(slength, mlength)\n case 1 {\n // slength can contain both the length and contents of the array\n // if length < 32 bytes so let's prepare for that\n // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage\n if iszero(iszero(slength)) {\n switch lt(slength, 32)\n case 1 {\n // blank the last byte which is the length\n fslot := mul(div(fslot, 0x100), 0x100)\n\n if iszero(eq(fslot, mload(add(_postBytes, 0x20)))) {\n // unsuccess:\n success := 0\n }\n }\n default {\n // cb is a circuit breaker in the for loop since there's\n // no said feature for inline assembly loops\n // cb = 1 - don't breaker\n // cb = 0 - break\n let cb := 1\n\n // get the keccak hash to get the contents of the array\n mstore(0x0, _preBytes_slot)\n let sc := keccak256(0x0, 0x20)\n\n let mc := add(_postBytes, 0x20)\n let end := add(mc, mlength)\n\n // the next line is the loop condition:\n // while(uint(mc < end) + cb == 2)\n for {} eq(add(lt(mc, end), cb), 2) {\n sc := add(sc, 1)\n mc := add(mc, 0x20)\n } {\n if iszero(eq(sload(sc), mload(mc))) {\n // unsuccess:\n success := 0\n cb := 0\n }\n }\n }\n }\n }\n default {\n // unsuccess:\n success := 0\n }\n }\n\n return success;\n }\n}\n"},{"file_path":"lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol","source_code":"pragma solidity ^0.5.0;\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP. Does not include\n * the optional functions; to access them see {ERC20Detailed}.\n */\ninterface IERC20 {\n /**\n * @dev Returns the amount of tokens in existence.\n */\n function totalSupply() external view returns (uint256);\n\n /**\n * @dev Returns the amount of tokens owned by `account`.\n */\n function balanceOf(address account) external view returns (uint256);\n\n /**\n * @dev Moves `amount` tokens from the caller's account to `recipient`.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * Emits a {Transfer} event.\n */\n function transfer(address recipient, uint256 amount) external returns (bool);\n\n /**\n * @dev Returns the remaining number of tokens that `spender` will be\n * allowed to spend on behalf of `owner` through {transferFrom}. This is\n * zero by default.\n *\n * This value changes when {approve} or {transferFrom} are called.\n */\n function allowance(address owner, address spender) external view returns (uint256);\n\n /**\n * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * IMPORTANT: Beware that changing an allowance with this method brings the risk\n * that someone may use both the old and the new allowance by unfortunate\n * transaction ordering. One possible solution to mitigate this race\n * condition is to first reduce the spender's allowance to 0 and set the\n * desired value afterwards:\n * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n *\n * Emits an {Approval} event.\n */\n function approve(address spender, uint256 amount) external returns (bool);\n\n /**\n * @dev Moves `amount` tokens from `sender` to `recipient` using the\n * allowance mechanism. `amount` is then deducted from the caller's\n * allowance.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * Emits a {Transfer} event.\n */\n function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);\n\n /**\n * @dev Emitted when `value` tokens are moved from one account (`from`) to\n * another (`to`).\n *\n * Note that `value` may be zero.\n */\n event Transfer(address indexed from, address indexed to, uint256 value);\n\n /**\n * @dev Emitted when the allowance of a `spender` for an `owner` is set by\n * a call to {approve}. `value` is the new allowance.\n */\n event Approval(address indexed owner, address indexed spender, uint256 value);\n}\n"},{"file_path":"contracts/common/interfaces/IFeeCurrencyWhitelist.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\ninterface IFeeCurrencyWhitelist {\n function initialize() external;\n function addToken(address) external;\n function getWhitelist() external view returns (address[] memory);\n}\n"},{"file_path":"contracts/common/linkedlists/LinkedList.sol","source_code":"pragma solidity ^0.5.13;\n\nimport \"openzeppelin-solidity/contracts/math/SafeMath.sol\";\n\n/**\n * @title Maintains a doubly linked list keyed by bytes32.\n * @dev Following the `next` pointers will lead you to the head, rather than the tail.\n */\nlibrary LinkedList {\n using SafeMath for uint256;\n\n struct Element {\n bytes32 previousKey;\n bytes32 nextKey;\n bool exists;\n }\n\n struct List {\n bytes32 head;\n bytes32 tail;\n uint256 numElements;\n mapping(bytes32 => Element) elements;\n }\n\n /**\n * @notice Inserts an element into a doubly linked list.\n * @param list A storage pointer to the underlying list.\n * @param key The key of the element to insert.\n * @param previousKey The key of the element that comes before the element to insert.\n * @param nextKey The key of the element that comes after the element to insert.\n */\n function insert(List storage list, bytes32 key, bytes32 previousKey, bytes32 nextKey) internal {\n require(key != bytes32(0), \"Key must be defined\");\n require(!contains(list, key), \"Can't insert an existing element\");\n require(\n previousKey != key && nextKey != key,\n \"Key cannot be the same as previousKey or nextKey\"\n );\n\n Element storage element = list.elements[key];\n element.exists = true;\n\n if (list.numElements == 0) {\n list.tail = key;\n list.head = key;\n } else {\n require(\n previousKey != bytes32(0) || nextKey != bytes32(0),\n \"Either previousKey or nextKey must be defined\"\n );\n\n element.previousKey = previousKey;\n element.nextKey = nextKey;\n\n if (previousKey != bytes32(0)) {\n require(\n contains(list, previousKey),\n \"If previousKey is defined, it must exist in the list\"\n );\n Element storage previousElement = list.elements[previousKey];\n require(previousElement.nextKey == nextKey, \"previousKey must be adjacent to nextKey\");\n previousElement.nextKey = key;\n } else {\n list.tail = key;\n }\n\n if (nextKey != bytes32(0)) {\n require(contains(list, nextKey), \"If nextKey is defined, it must exist in the list\");\n Element storage nextElement = list.elements[nextKey];\n require(nextElement.previousKey == previousKey, \"previousKey must be adjacent to nextKey\");\n nextElement.previousKey = key;\n } else {\n list.head = key;\n }\n }\n\n list.numElements = list.numElements.add(1);\n }\n\n /**\n * @notice Inserts an element at the tail of the doubly linked list.\n * @param list A storage pointer to the underlying list.\n * @param key The key of the element to insert.\n */\n function push(List storage list, bytes32 key) internal {\n insert(list, key, bytes32(0), list.tail);\n }\n\n /**\n * @notice Removes an element from the doubly linked list.\n * @param list A storage pointer to the underlying list.\n * @param key The key of the element to remove.\n */\n function remove(List storage list, bytes32 key) internal {\n Element storage element = list.elements[key];\n require(key != bytes32(0) && contains(list, key), \"key not in list\");\n if (element.previousKey != bytes32(0)) {\n Element storage previousElement = list.elements[element.previousKey];\n previousElement.nextKey = element.nextKey;\n } else {\n list.tail = element.nextKey;\n }\n\n if (element.nextKey != bytes32(0)) {\n Element storage nextElement = list.elements[element.nextKey];\n nextElement.previousKey = element.previousKey;\n } else {\n list.head = element.previousKey;\n }\n\n delete list.elements[key];\n list.numElements = list.numElements.sub(1);\n }\n\n /**\n * @notice Updates an element in the list.\n * @param list A storage pointer to the underlying list.\n * @param key The element key.\n * @param previousKey The key of the element that comes before the updated element.\n * @param nextKey The key of the element that comes after the updated element.\n */\n function update(List storage list, bytes32 key, bytes32 previousKey, bytes32 nextKey) internal {\n require(\n key != bytes32(0) && key != previousKey && key != nextKey && contains(list, key),\n \"key on in list\"\n );\n remove(list, key);\n insert(list, key, previousKey, nextKey);\n }\n\n /**\n * @notice Returns whether or not a particular key is present in the sorted list.\n * @param list A storage pointer to the underlying list.\n * @param key The element key.\n * @return Whether or not the key is in the sorted list.\n */\n function contains(List storage list, bytes32 key) internal view returns (bool) {\n return list.elements[key].exists;\n }\n\n /**\n * @notice Returns the keys of the N elements at the head of the list.\n * @param list A storage pointer to the underlying list.\n * @param n The number of elements to return.\n * @return The keys of the N elements at the head of the list.\n * @dev Reverts if n is greater than the number of elements in the list.\n */\n function headN(List storage list, uint256 n) internal view returns (bytes32[] memory) {\n require(n <= list.numElements, \"not enough elements\");\n bytes32[] memory keys = new bytes32[](n);\n bytes32 key = list.head;\n for (uint256 i = 0; i < n; i = i.add(1)) {\n keys[i] = key;\n key = list.elements[key].previousKey;\n }\n return keys;\n }\n\n /**\n * @notice Gets all element keys from the doubly linked list.\n * @param list A storage pointer to the underlying list.\n * @return All element keys from head to tail.\n */\n function getKeys(List storage list) internal view returns (bytes32[] memory) {\n return headN(list, list.numElements);\n }\n}\n"},{"file_path":"contracts/common/UsingPrecompiles.sol","source_code":"pragma solidity ^0.5.13;\n\nimport \"openzeppelin-solidity/contracts/math/SafeMath.sol\";\nimport \"../common/interfaces/ICeloVersionedContract.sol\";\nimport \"../common/interfaces/IEpochManager.sol\";\nimport \"../../contracts-0.8/common/IsL2Check.sol\";\n\ncontract UsingPrecompiles is IsL2Check {\n using SafeMath for uint256;\n\n address constant TRANSFER = address(0xff - 2);\n address constant FRACTION_MUL = address(0xff - 3);\n address constant PROOF_OF_POSSESSION = address(0xff - 4);\n address constant GET_VALIDATOR = address(0xff - 5);\n address constant NUMBER_VALIDATORS = address(0xff - 6);\n address constant EPOCH_SIZE = address(0xff - 7);\n address constant BLOCK_NUMBER_FROM_HEADER = address(0xff - 8);\n address constant HASH_HEADER = address(0xff - 9);\n address constant GET_PARENT_SEAL_BITMAP = address(0xff - 10);\n address constant GET_VERIFIED_SEAL_BITMAP = address(0xff - 11);\n uint256 constant DAY = 86400;\n\n /**\n * @notice calculate a * b^x for fractions a, b to `decimals` precision\n * @param aNumerator Numerator of first fraction\n * @param aDenominator Denominator of first fraction\n * @param bNumerator Numerator of exponentiated fraction\n * @param bDenominator Denominator of exponentiated fraction\n * @param exponent exponent to raise b to\n * @param _decimals precision\n * @return Numerator of the computed quantity (not reduced).\n * @return Denominator of the computed quantity (not reduced).\n * @dev This function will be deprecated in L2.\n */\n function fractionMulExp(\n uint256 aNumerator,\n uint256 aDenominator,\n uint256 bNumerator,\n uint256 bDenominator,\n uint256 exponent,\n uint256 _decimals\n ) public view onlyL1 returns (uint256, uint256) {\n require(aDenominator != 0 && bDenominator != 0, \"a denominator is zero\");\n uint256 returnNumerator;\n uint256 returnDenominator;\n bool success;\n bytes memory out;\n (success, out) = FRACTION_MUL.staticcall(\n abi.encodePacked(aNumerator, aDenominator, bNumerator, bDenominator, exponent, _decimals)\n );\n require(success, \"error calling fractionMulExp precompile\");\n returnNumerator = getUint256FromBytes(out, 0);\n returnDenominator = getUint256FromBytes(out, 32);\n return (returnNumerator, returnDenominator);\n }\n\n /**\n * @notice Returns the current epoch size in blocks.\n * @return The current epoch size in blocks.\n * @dev This function will be deprecated in L2.\n */\n function getEpochSize() public view onlyL1 returns (uint256) {\n bytes memory out;\n bool success;\n (success, out) = EPOCH_SIZE.staticcall(abi.encodePacked(true));\n require(success, \"error calling getEpochSize precompile\");\n return getUint256FromBytes(out, 0);\n }\n\n /**\n * @notice Returns the epoch number at a block.\n * @param blockNumber Block number where epoch number is calculated.\n * @return Epoch number.\n * @dev This function will be deprecated in L2.\n */\n function getEpochNumberOfBlock(uint256 blockNumber) public view onlyL1 returns (uint256) {\n return epochNumberOfBlock(blockNumber, getEpochSize());\n }\n\n /**\n * @notice Returns the epoch number at a block.\n * @return Current epoch number.\n * @dev This function will be deprecated in L2.\n */\n function getEpochNumber() public view onlyL1 returns (uint256) {\n return getEpochNumberOfBlock(block.number);\n }\n\n /**\n * @notice Gets a validator signer address from the current validator set.\n * @param index Index of requested validator in the validator set.\n * @return Address of validator signer at the requested index.\n * @dev This function will be deprecated in L2.\n */\n function validatorSignerAddressFromCurrentSet(\n uint256 index\n ) public view onlyL1 returns (address) {\n bytes memory out;\n bool success;\n (success, out) = GET_VALIDATOR.staticcall(abi.encodePacked(index, uint256(block.number)));\n require(success, \"error calling validatorSignerAddressFromCurrentSet precompile\");\n return address(uint160(getUint256FromBytes(out, 0)));\n }\n\n /**\n * @notice Gets a validator signer address from the validator set at the given block number.\n * @param index Index of requested validator in the validator set.\n * @param blockNumber Block number to retrieve the validator set from.\n * @return Address of validator signer at the requested index.\n * @dev This function will be deprecated in L2.\n */\n function validatorSignerAddressFromSet(\n uint256 index,\n uint256 blockNumber\n ) public view onlyL1 returns (address) {\n bytes memory out;\n bool success;\n (success, out) = GET_VALIDATOR.staticcall(abi.encodePacked(index, blockNumber));\n require(success, \"error calling validatorSignerAddressFromSet precompile\");\n return address(uint160(getUint256FromBytes(out, 0)));\n }\n\n /**\n * @notice Gets the size of the current elected validator set.\n * @return Size of the current elected validator set.\n * @dev This function will be deprecated in L2.\n */\n function numberValidatorsInCurrentSet() public view onlyL1 returns (uint256) {\n bytes memory out;\n bool success;\n (success, out) = NUMBER_VALIDATORS.staticcall(abi.encodePacked(uint256(block.number)));\n require(success, \"error calling numberValidatorsInCurrentSet precompile\");\n return getUint256FromBytes(out, 0);\n }\n\n /**\n * @notice Gets the size of the validator set that must sign the given block number.\n * @param blockNumber Block number to retrieve the validator set from.\n * @return Size of the validator set.\n * @dev This function will be deprecated in L2.\n */\n function numberValidatorsInSet(uint256 blockNumber) public view onlyL1 returns (uint256) {\n bytes memory out;\n bool success;\n (success, out) = NUMBER_VALIDATORS.staticcall(abi.encodePacked(blockNumber));\n require(success, \"error calling numberValidatorsInSet precompile\");\n return getUint256FromBytes(out, 0);\n }\n\n /**\n * @notice Checks a BLS proof of possession.\n * @param sender The address signed by the BLS key to generate the proof of possession.\n * @param blsKey The BLS public key that the validator is using for consensus, should pass proof\n * of possession. 48 bytes.\n * @param blsPop The BLS public key proof-of-possession, which consists of a signature on the\n * account address. 96 bytes.\n * @return True upon success.\n * @dev This function will be deprecated in L2.\n */\n function checkProofOfPossession(\n address sender,\n bytes memory blsKey,\n bytes memory blsPop\n ) public view onlyL1 returns (bool) {\n bool success;\n (success, ) = PROOF_OF_POSSESSION.staticcall(abi.encodePacked(sender, blsKey, blsPop));\n return success;\n }\n\n /**\n * @notice Parses block number out of header.\n * @param header RLP encoded header\n * @return Block number.\n * @dev This function will be deprecated in L2.\n */\n function getBlockNumberFromHeader(bytes memory header) public view onlyL1 returns (uint256) {\n bytes memory out;\n bool success;\n (success, out) = BLOCK_NUMBER_FROM_HEADER.staticcall(abi.encodePacked(header));\n require(success, \"error calling getBlockNumberFromHeader precompile\");\n return getUint256FromBytes(out, 0);\n }\n\n /**\n * @notice Computes hash of header.\n * @param header RLP encoded header\n * @return Header hash.\n * @dev This function will be deprecated in L2.\n */\n function hashHeader(bytes memory header) public view onlyL1 returns (bytes32) {\n bytes memory out;\n bool success;\n (success, out) = HASH_HEADER.staticcall(abi.encodePacked(header));\n require(success, \"error calling hashHeader precompile\");\n return getBytes32FromBytes(out, 0);\n }\n\n /**\n * @notice Gets the parent seal bitmap from the header at the given block number.\n * @param blockNumber Block number to retrieve. Must be within 4 epochs of the current number.\n * @return Bitmap parent seal with set bits at indices corresponding to signing validators.\n * @dev This function will be deprecated in L2.\n */\n function getParentSealBitmap(uint256 blockNumber) public view onlyL1 returns (bytes32) {\n bytes memory out;\n bool success;\n (success, out) = GET_PARENT_SEAL_BITMAP.staticcall(abi.encodePacked(blockNumber));\n require(success, \"error calling getParentSealBitmap precompile\");\n return getBytes32FromBytes(out, 0);\n }\n\n /**\n * @notice Verifies the BLS signature on the header and returns the seal bitmap.\n * The validator set used for verification is retrieved based on the parent hash field of the\n * header. If the parent hash is not in the blockchain, verification fails.\n * @param header RLP encoded header\n * @return Bitmap parent seal with set bits at indices correspoinding to signing validators.\n * @dev This function will be deprecated in L2.\n */\n function getVerifiedSealBitmapFromHeader(\n bytes memory header\n ) public view onlyL1 returns (bytes32) {\n bytes memory out;\n bool success;\n (success, out) = GET_VERIFIED_SEAL_BITMAP.staticcall(abi.encodePacked(header));\n require(success, \"error calling getVerifiedSealBitmapFromHeader precompile\");\n return getBytes32FromBytes(out, 0);\n }\n\n /**\n * @notice Returns the minimum number of required signers for a given block number.\n * @dev Computed in celo-blockchain as int(math.Ceil(float64(2*valSet.Size()) / 3))\n * @dev This function will be deprecated in L2.\n */\n function minQuorumSize(uint256 blockNumber) public view onlyL1 returns (uint256) {\n return numberValidatorsInSet(blockNumber).mul(2).add(2).div(3);\n }\n\n /**\n * @notice Computes byzantine quorum from current validator set size\n * @return Byzantine quorum of validators.\n * @dev This function will be deprecated in L2.\n */\n function minQuorumSizeInCurrentSet() public view onlyL1 returns (uint256) {\n return minQuorumSize(block.number);\n }\n\n /**\n * @notice Returns the epoch number at a block.\n * @param blockNumber Block number where epoch number is calculated.\n * @param epochSize The epoch size in blocks.\n * @return Epoch number.\n */\n function epochNumberOfBlock(\n uint256 blockNumber,\n uint256 epochSize\n ) internal pure returns (uint256) {\n // Follows GetEpochNumber from celo-blockchain/blob/master/consensus/istanbul/utils.go\n uint256 epochNumber = blockNumber / epochSize;\n if (blockNumber % epochSize == 0) {\n return epochNumber;\n } else {\n return epochNumber.add(1);\n }\n }\n\n /**\n * @notice Converts bytes to uint256.\n * @param bs byte[] data\n * @param start offset into byte data to convert\n * @return uint256 data\n */\n function getUint256FromBytes(bytes memory bs, uint256 start) internal pure returns (uint256) {\n return uint256(getBytes32FromBytes(bs, start));\n }\n\n /**\n * @notice Converts bytes to bytes32.\n * @param bs byte[] data\n * @param start offset into byte data to convert\n * @return bytes32 data\n */\n function getBytes32FromBytes(bytes memory bs, uint256 start) internal pure returns (bytes32) {\n require(bs.length >= start.add(32), \"slicing out of range\");\n bytes32 x;\n assembly {\n x := mload(add(bs, add(start, 32)))\n }\n return x;\n }\n}\n"},{"file_path":"contracts/governance/interfaces/IValidators.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\ninterface IValidators {\n function registerValidator(bytes calldata) external returns (bool);\n function registerValidatorNoBls(bytes calldata ecdsaPublicKey) external returns (bool);\n function deregisterValidator(uint256) external returns (bool);\n function affiliate(address) external returns (bool);\n function deaffiliate() external returns (bool);\n function registerValidatorGroup(uint256) external returns (bool);\n function deregisterValidatorGroup(uint256) external returns (bool);\n function addMember(address) external returns (bool);\n function addFirstMember(address, address, address) external returns (bool);\n function removeMember(address) external returns (bool);\n function reorderMember(address, address, address) external returns (bool);\n function updateCommission() external;\n function setNextCommissionUpdate(uint256) external;\n function resetSlashingMultiplier() external;\n\n // only owner\n function setCommissionUpdateDelay(uint256) external;\n function setMaxGroupSize(uint256) external returns (bool);\n function setMembershipHistoryLength(uint256) external returns (bool);\n function setGroupLockedGoldRequirements(uint256, uint256) external returns (bool);\n function setValidatorLockedGoldRequirements(uint256, uint256) external returns (bool);\n function setSlashingMultiplierResetPeriod(uint256) external;\n\n // only registered contract\n function updateEcdsaPublicKey(address, address, bytes calldata) external returns (bool);\n function mintStableToEpochManager(uint256 amount) external;\n\n // only slasher\n function forceDeaffiliateIfValidator(address) external;\n function halveSlashingMultiplier(address) external;\n\n // view functions\n function maxGroupSize() external view returns (uint256);\n function getCommissionUpdateDelay() external view returns (uint256);\n function getMembershipHistory(\n address\n ) external view returns (uint256[] memory, address[] memory, uint256, uint256);\n function getAccountLockedGoldRequirement(address) external view returns (uint256);\n function meetsAccountLockedGoldRequirements(address) external view returns (bool);\n function getValidator(\n address account\n ) external view returns (bytes memory, bytes memory, address, uint256, address);\n function getValidatorsGroup(address account) external view returns (address affiliation);\n function getValidatorGroup(\n address\n )\n external\n view\n returns (address[] memory, uint256, uint256, uint256, uint256[] memory, uint256, uint256);\n function getGroupNumMembers(address) external view returns (uint256);\n function getTopGroupValidators(address, uint256) external view returns (address[] memory);\n function getTopGroupValidatorsAccounts(address, uint256) external view returns (address[] memory);\n function getGroupsNumMembers(\n address[] calldata accounts\n ) external view returns (uint256[] memory);\n function getNumRegisteredValidators() external view returns (uint256);\n function groupMembershipInEpoch(address, uint256, uint256) external view returns (address);\n\n function getValidatorLockedGoldRequirements() external view returns (uint256, uint256);\n function getGroupLockedGoldRequirements() external view returns (uint256, uint256);\n function getRegisteredValidators() external view returns (address[] memory);\n function getRegisteredValidatorGroups() external view returns (address[] memory);\n function isValidatorGroup(address) external view returns (bool);\n function isValidator(address) external view returns (bool);\n function getValidatorGroupSlashingMultiplier(address) external view returns (uint256);\n function getMembershipInLastEpoch(address) external view returns (address);\n function getMembershipInLastEpochFromSigner(address) external view returns (address);\n function computeEpochReward(\n address account,\n uint256 score,\n uint256 maxPayment\n ) external view returns (uint256);\n function getMembershipHistoryLength() external view returns (uint256);\n}\n"},{"file_path":"contracts/common/ExtractFunctionSignature.sol","source_code":"pragma solidity ^0.5.13;\n\nlibrary ExtractFunctionSignature {\n /**\n * @notice Extracts the first four bytes of a byte array.\n * @param input The byte array.\n * @return The first four bytes of `input`.\n */\n function extractFunctionSignature(bytes memory input) internal pure returns (bytes4) {\n return (bytes4(input[0]) |\n (bytes4(input[1]) >> 8) |\n (bytes4(input[2]) >> 16) |\n (bytes4(input[3]) >> 24));\n }\n}\n"},{"file_path":"lib/mento-core/contracts/interfaces/IExchange.sol","source_code":"pragma solidity ^0.5.13;\n\ninterface IExchange {\n function buy(\n uint256,\n uint256,\n bool\n ) external returns (uint256);\n\n function sell(\n uint256,\n uint256,\n bool\n ) external returns (uint256);\n\n function exchange(\n uint256,\n uint256,\n bool\n ) external returns (uint256);\n\n function setUpdateFrequency(uint256) external;\n\n function getBuyTokenAmount(uint256, bool) external view returns (uint256);\n\n function getSellTokenAmount(uint256, bool) external view returns (uint256);\n\n function getBuyAndSellBuckets(bool) external view returns (uint256, uint256);\n}\n"},{"file_path":"contracts/common/FixidityLib.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\n/**\n * @title FixidityLib\n * @author Gadi Guy, Alberto Cuesta Canada\n * @notice This library provides fixed point arithmetic with protection against\n * overflow.\n * All operations are done with uint256 and the operands must have been created\n * with any of the newFrom* functions, which shift the comma digits() to the\n * right and check for limits, or with wrap() which expects a number already\n * in the internal representation of a fraction.\n * When using this library be sure to use maxNewFixed() as the upper limit for\n * creation of fixed point numbers.\n * @dev All contained functions are pure and thus marked internal to be inlined\n * on consuming contracts at compile time for gas efficiency.\n */\nlibrary FixidityLib {\n struct Fraction {\n uint256 value;\n }\n\n uint256 private constant FIXED1_UINT = 1000000000000000000000000;\n\n /**\n * @notice Number of positions that the comma is shifted to the right.\n */\n function digits() internal pure returns (uint8) {\n return 24;\n }\n\n /**\n * @notice This is 1 in the fixed point units used in this library.\n * @dev Test fixed1() equals 10^digits()\n * Hardcoded to 24 digits.\n */\n function fixed1() internal pure returns (Fraction memory) {\n return Fraction(FIXED1_UINT);\n }\n\n /**\n * @notice Wrap a uint256 that represents a 24-decimal fraction in a Fraction\n * struct.\n * @param x Number that already represents a 24-decimal fraction.\n * @return A Fraction struct with contents x.\n */\n function wrap(uint256 x) internal pure returns (Fraction memory) {\n return Fraction(x);\n }\n\n /**\n * @notice Unwraps the uint256 inside of a Fraction struct.\n */\n function unwrap(Fraction memory x) internal pure returns (uint256) {\n return x.value;\n }\n\n /**\n * @notice The amount of decimals lost on each multiplication operand.\n * @dev Test mulPrecision() equals sqrt(fixed1)\n */\n function mulPrecision() internal pure returns (uint256) {\n return 1000000000000;\n }\n\n /**\n * @notice Maximum value that can be converted to fixed point. Optimize for deployment.\n * @dev\n * Test maxNewFixed() equals maxUint256() / fixed1()\n */\n function maxNewFixed() internal pure returns (uint256) {\n return 115792089237316195423570985008687907853269984665640564;\n }\n\n /**\n * @notice Converts a uint256 to fixed point Fraction\n * @dev Test newFixed(0) returns 0\n * Test newFixed(1) returns fixed1()\n * Test newFixed(maxNewFixed()) returns maxNewFixed() * fixed1()\n * Test newFixed(maxNewFixed()+1) fails\n */\n function newFixed(uint256 x) internal pure returns (Fraction memory) {\n require(x <= maxNewFixed(), \"can't create fixidity number larger than maxNewFixed()\");\n return Fraction(x * FIXED1_UINT);\n }\n\n /**\n * @notice Converts a uint256 in the fixed point representation of this\n * library to a non decimal. All decimal digits will be truncated.\n */\n function fromFixed(Fraction memory x) internal pure returns (uint256) {\n return x.value / FIXED1_UINT;\n }\n\n /**\n * @notice Converts two uint256 representing a fraction to fixed point units,\n * equivalent to multiplying dividend and divisor by 10^digits().\n * @param numerator numerator must be <= maxNewFixed()\n * @param denominator denominator must be <= maxNewFixed() and denominator can't be 0\n * @dev\n * Test newFixedFraction(1,0) fails\n * Test newFixedFraction(0,1) returns 0\n * Test newFixedFraction(1,1) returns fixed1()\n * Test newFixedFraction(1,fixed1()) returns 1\n */\n function newFixedFraction(\n uint256 numerator,\n uint256 denominator\n ) internal pure returns (Fraction memory) {\n Fraction memory convertedNumerator = newFixed(numerator);\n Fraction memory convertedDenominator = newFixed(denominator);\n return divide(convertedNumerator, convertedDenominator);\n }\n\n /**\n * @notice Returns the integer part of a fixed point number.\n * @dev\n * Test integer(0) returns 0\n * Test integer(fixed1()) returns fixed1()\n * Test integer(newFixed(maxNewFixed())) returns maxNewFixed()*fixed1()\n */\n function integer(Fraction memory x) internal pure returns (Fraction memory) {\n return Fraction((x.value / FIXED1_UINT) * FIXED1_UINT); // Can't overflow\n }\n\n /**\n * @notice Returns the fractional part of a fixed point number.\n * In the case of a negative number the fractional is also negative.\n * @dev\n * Test fractional(0) returns 0\n * Test fractional(fixed1()) returns 0\n * Test fractional(fixed1()-1) returns 10^24-1\n */\n function fractional(Fraction memory x) internal pure returns (Fraction memory) {\n return Fraction(x.value - (x.value / FIXED1_UINT) * FIXED1_UINT); // Can't overflow\n }\n\n /**\n * @notice x+y.\n * @dev The maximum value that can be safely used as an addition operator is defined as\n * maxFixedAdd = maxUint256()-1 / 2, or\n * 57896044618658097711785492504343953926634992332820282019728792003956564819967.\n * Test add(maxFixedAdd,maxFixedAdd) equals maxFixedAdd + maxFixedAdd\n * Test add(maxFixedAdd+1,maxFixedAdd+1) throws\n */\n function add(Fraction memory x, Fraction memory y) internal pure returns (Fraction memory) {\n uint256 z = x.value + y.value;\n require(z >= x.value, \"add overflow detected\");\n return Fraction(z);\n }\n\n /**\n * @notice x-y.\n * @dev\n * Test subtract(6, 10) fails\n */\n function subtract(Fraction memory x, Fraction memory y) internal pure returns (Fraction memory) {\n require(x.value >= y.value, \"substraction underflow detected\");\n return Fraction(x.value - y.value);\n }\n\n /**\n * @notice x*y. If any of the operators is higher than the max multiplier value it\n * might overflow.\n * @dev The maximum value that can be safely used as a multiplication operator\n * (maxFixedMul) is calculated as sqrt(maxUint256()*fixed1()),\n * or 340282366920938463463374607431768211455999999999999\n * Test multiply(0,0) returns 0\n * Test multiply(maxFixedMul,0) returns 0\n * Test multiply(0,maxFixedMul) returns 0\n * Test multiply(fixed1()/mulPrecision(),fixed1()*mulPrecision()) returns fixed1()\n * Test multiply(maxFixedMul,maxFixedMul) is around maxUint256()\n * Test multiply(maxFixedMul+1,maxFixedMul+1) fails\n */\n function multiply(Fraction memory x, Fraction memory y) internal pure returns (Fraction memory) {\n if (x.value == 0 || y.value == 0) return Fraction(0);\n if (y.value == FIXED1_UINT) return x;\n if (x.value == FIXED1_UINT) return y;\n\n // Separate into integer and fractional parts\n // x = x1 + x2, y = y1 + y2\n uint256 x1 = integer(x).value / FIXED1_UINT;\n uint256 x2 = fractional(x).value;\n uint256 y1 = integer(y).value / FIXED1_UINT;\n uint256 y2 = fractional(y).value;\n\n // (x1 + x2) * (y1 + y2) = (x1 * y1) + (x1 * y2) + (x2 * y1) + (x2 * y2)\n uint256 x1y1 = x1 * y1;\n if (x1 != 0) require(x1y1 / x1 == y1, \"overflow x1y1 detected\");\n\n // x1y1 needs to be multiplied back by fixed1\n // solium-disable-next-line mixedcase\n uint256 fixed_x1y1 = x1y1 * FIXED1_UINT;\n if (x1y1 != 0) require(fixed_x1y1 / x1y1 == FIXED1_UINT, \"overflow x1y1 * fixed1 detected\");\n x1y1 = fixed_x1y1;\n\n uint256 x2y1 = x2 * y1;\n if (x2 != 0) require(x2y1 / x2 == y1, \"overflow x2y1 detected\");\n\n uint256 x1y2 = x1 * y2;\n if (x1 != 0) require(x1y2 / x1 == y2, \"overflow x1y2 detected\");\n\n x2 = x2 / mulPrecision();\n y2 = y2 / mulPrecision();\n uint256 x2y2 = x2 * y2;\n if (x2 != 0) require(x2y2 / x2 == y2, \"overflow x2y2 detected\");\n\n // result = fixed1() * x1 * y1 + x1 * y2 + x2 * y1 + x2 * y2 / fixed1();\n Fraction memory result = Fraction(x1y1);\n result = add(result, Fraction(x2y1)); // Add checks for overflow\n result = add(result, Fraction(x1y2)); // Add checks for overflow\n result = add(result, Fraction(x2y2)); // Add checks for overflow\n return result;\n }\n\n /**\n * @notice 1/x\n * @dev\n * Test reciprocal(0) fails\n * Test reciprocal(fixed1()) returns fixed1()\n * Test reciprocal(fixed1()*fixed1()) returns 1 // Testing how the fractional is truncated\n * Test reciprocal(1+fixed1()*fixed1()) returns 0 // Testing how the fractional is truncated\n * Test reciprocal(newFixedFraction(1, 1e24)) returns newFixed(1e24)\n */\n function reciprocal(Fraction memory x) internal pure returns (Fraction memory) {\n require(x.value != 0, \"can't call reciprocal(0)\");\n return Fraction((FIXED1_UINT * FIXED1_UINT) / x.value); // Can't overflow\n }\n\n /**\n * @notice x/y. If the dividend is higher than the max dividend value, it\n * might overflow. You can use multiply(x,reciprocal(y)) instead.\n * @dev The maximum value that can be safely used as a dividend (maxNewFixed) is defined as\n * divide(maxNewFixed,newFixedFraction(1,fixed1())) is around maxUint256().\n * This yields the value 115792089237316195423570985008687907853269984665640564.\n * Test maxNewFixed equals maxUint256()/fixed1()\n * Test divide(maxNewFixed,1) equals maxNewFixed*(fixed1)\n * Test divide(maxNewFixed+1,multiply(mulPrecision(),mulPrecision())) throws\n * Test divide(fixed1(),0) fails\n * Test divide(maxNewFixed,1) = maxNewFixed*(10^digits())\n * Test divide(maxNewFixed+1,1) throws\n */\n function divide(Fraction memory x, Fraction memory y) internal pure returns (Fraction memory) {\n require(y.value != 0, \"can't divide by 0\");\n uint256 X = x.value * FIXED1_UINT;\n require(X / FIXED1_UINT == x.value, \"overflow at divide\");\n return Fraction(X / y.value);\n }\n\n /**\n * @notice x > y\n */\n function gt(Fraction memory x, Fraction memory y) internal pure returns (bool) {\n return x.value > y.value;\n }\n\n /**\n * @notice x >= y\n */\n function gte(Fraction memory x, Fraction memory y) internal pure returns (bool) {\n return x.value >= y.value;\n }\n\n /**\n * @notice x < y\n */\n function lt(Fraction memory x, Fraction memory y) internal pure returns (bool) {\n return x.value < y.value;\n }\n\n /**\n * @notice x <= y\n */\n function lte(Fraction memory x, Fraction memory y) internal pure returns (bool) {\n return x.value <= y.value;\n }\n\n /**\n * @notice x == y\n */\n function equals(Fraction memory x, Fraction memory y) internal pure returns (bool) {\n return x.value == y.value;\n }\n\n /**\n * @notice x <= 1\n */\n function isProperFraction(Fraction memory x) internal pure returns (bool) {\n return lte(x, fixed1());\n }\n}\n"},{"file_path":"contracts/governance/interfaces/ILockedGold.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\ninterface ILockedGold {\n function lock() external payable;\n function incrementNonvotingAccountBalance(address, uint256) external;\n function decrementNonvotingAccountBalance(address, uint256) external;\n\n function unlock(uint256) external;\n function relock(uint256, uint256) external;\n function withdraw(uint256) external;\n function slash(\n address account,\n uint256 penalty,\n address reporter,\n uint256 reward,\n address[] calldata lessers,\n address[] calldata greaters,\n uint256[] calldata indices\n ) external;\n function addSlasher(string calldata slasherIdentifier) external;\n\n function getAccountTotalLockedGold(address) external view returns (uint256);\n function getTotalLockedGold() external view returns (uint256);\n function getPendingWithdrawals(\n address\n ) external view returns (uint256[] memory, uint256[] memory);\n function getPendingWithdrawal(\n address account,\n uint256 index\n ) external view returns (uint256, uint256);\n function getTotalPendingWithdrawals(address) external view returns (uint256);\n function isSlasher(address) external view returns (bool);\n\n function getAccountTotalDelegatedFraction(address account) external view returns (uint256);\n\n function getAccountTotalGovernanceVotingPower(address account) external view returns (uint256);\n function unlockingPeriod() external view returns (uint256);\n function getAccountNonvotingLockedGold(address account) external view returns (uint256);\n}\n"},{"file_path":"lib/mento-core/contracts/interfaces/IStableToken.sol","source_code":"pragma solidity ^0.5.13;\n\n/**\n * @title This interface describes the functions specific to Celo Stable Tokens, and in the\n * absence of interface inheritance is intended as a companion to IERC20.sol and ICeloToken.sol.\n */\ninterface IStableToken {\n function mint(address, uint256) external returns (bool);\n\n function burn(uint256) external returns (bool);\n\n function setInflationParameters(uint256, uint256) external;\n\n function valueToUnits(uint256) external view returns (uint256);\n\n function unitsToValue(uint256) external view returns (uint256);\n\n function getInflationParameters()\n external\n view\n returns (\n uint256,\n uint256,\n uint256,\n uint256\n );\n\n // NOTE: duplicated with IERC20.sol, remove once interface inheritance is supported.\n function balanceOf(address) external view returns (uint256);\n}\n"},{"file_path":"contracts/common/interfaces/ICeloVersionedContract.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\ninterface ICeloVersionedContract {\n /**\n * @notice Returns the storage, major, minor, and patch version of the contract.\n * @return Storage version of the contract.\n * @return Major version of the contract.\n * @return Minor version of the contract.\n * @return Patch version of the contract.\n */\n function getVersionNumber() external pure returns (uint256, uint256, uint256, uint256);\n}\n"},{"file_path":"contracts/common/libraries/ReentrancyGuard.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.8.20;\n\n/**\n * @title Helps contracts guard against reentrancy attacks.\n * @author Remco Bloemen , Eenae \n * @dev If you mark a function `nonReentrant`, you should also\n * mark it `external`.\n */\ncontract ReentrancyGuard {\n /// @dev counter to allow mutex lock with only one SSTORE operation\n uint256 private _guardCounter;\n\n /**\n * @dev Prevents a contract from calling itself, directly or indirectly.\n * Calling a `nonReentrant` function from another `nonReentrant`\n * function is not supported. It is possible to prevent this from happening\n * by making the `nonReentrant` function external, and make it call a\n * `private` function that does the actual work.\n */\n modifier nonReentrant() {\n _guardCounter += 1;\n uint256 localCounter = _guardCounter;\n _;\n require(localCounter == _guardCounter, \"reentrant call\");\n }\n\n constructor() public {\n // The counter starts at one to prevent changing it from zero to a non-zero\n // value, which is a more expensive operation.\n _guardCounter = 1;\n }\n}\n"},{"file_path":"contracts/stability/interfaces/ISortedOracles.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\ninterface ISortedOracles {\n function addOracle(address, address) external;\n function removeOracle(address, address, uint256) external;\n function report(address, uint256, address, address) external;\n function removeExpiredReports(address, uint256) external;\n function isOldestReportExpired(address token) external view returns (bool, address);\n function numRates(address) external view returns (uint256);\n function medianRate(address) external view returns (uint256, uint256);\n function numTimestamps(address) external view returns (uint256);\n function medianTimestamp(address) external view returns (uint256);\n}\n"},{"file_path":"contracts/governance/interfaces/ILockedCelo.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\ninterface ILockedCelo {\n function lock() external payable;\n function incrementNonvotingAccountBalance(address, uint256) external;\n function decrementNonvotingAccountBalance(address, uint256) external;\n\n function unlock(uint256) external;\n function relock(uint256, uint256) external;\n function withdraw(uint256) external;\n function slash(\n address account,\n uint256 penalty,\n address reporter,\n uint256 reward,\n address[] calldata lessers,\n address[] calldata greaters,\n uint256[] calldata indices\n ) external;\n function addSlasher(string calldata slasherIdentifier) external;\n\n function getAccountNonvotingLockedGold(address account) external view returns (uint256);\n function getAccountTotalLockedCelo(address) external view returns (uint256);\n function getTotalLockedCelo() external view returns (uint256);\n function getPendingWithdrawals(\n address\n ) external view returns (uint256[] memory, uint256[] memory);\n function getPendingWithdrawal(\n address account,\n uint256 index\n ) external view returns (uint256, uint256);\n function getTotalPendingWithdrawals(address) external view returns (uint256);\n function isSlasher(address) external view returns (bool);\n\n function getAccountTotalDelegatedFraction(address account) external view returns (uint256);\n\n function getAccountTotalGovernanceVotingPower(address account) external view returns (uint256);\n function unlockingPeriod() external view returns (uint256);\n function getAccountNonvotingLockedCelo(address account) external view returns (uint256);\n\n function getAccountTotalLockedGold(address account) external view returns (uint256);\n}\n"},{"file_path":"contracts/common/PrecompilesOverride.sol","source_code":"pragma solidity ^0.5.13;\n\nimport \"./interfaces/ICeloVersionedContract.sol\";\nimport \"../../contracts-0.8/common/IsL2Check.sol\";\nimport \"./UsingRegistry.sol\";\n\nimport \"./UsingPrecompiles.sol\";\n\n/**\n * @title PrecompilesOverride Contract\n * @notice This contract allows for a smoother transition from L1 to L2\n * by abstracting away the usingPrecompile contract, and taking care of the L1 to L2 switching logic.\n **/\ncontract PrecompilesOverride is UsingPrecompiles, UsingRegistry {\n /**\n * @notice Returns the epoch number at a block.\n * @param blockNumber Block number where epoch number is calculated.\n * @return Epoch number.\n */\n function getEpochNumberOfBlock(uint256 blockNumber) public view returns (uint256) {\n if (isL2()) {\n return getEpochManager().getEpochNumberOfBlock(blockNumber);\n } else {\n return epochNumberOfBlock(blockNumber, getEpochSize());\n }\n }\n\n /**\n * @notice Returns the epoch number at a block.\n * @return Current epoch number.\n */\n function getEpochNumber() public view returns (uint256) {\n return getEpochNumberOfBlock(block.number);\n }\n\n /**\n * @notice Gets a validator signer address from the current validator set.\n * @param index Index of requested validator in the validator set.\n * @return Address of validator signer at the requested index.\n */\n function validatorSignerAddressFromCurrentSet(uint256 index) public view returns (address) {\n if (isL2()) {\n return getEpochManager().getElectedSignerByIndex(index);\n } else {\n return super.validatorSignerAddressFromCurrentSet(index);\n }\n }\n\n /**\n * @notice Gets a validator address from the current validator set.\n * @param index Index of requested validator in the validator set.\n * @return Address of validator at the requested index.\n */\n function validatorAddressFromCurrentSet(uint256 index) public view onlyL2 returns (address) {\n return getEpochManager().getElectedAccountByIndex(index);\n }\n\n /**\n * @notice Gets the size of the current elected validator set.\n * @return Size of the current elected validator set.\n */\n function numberValidatorsInCurrentSet() public view returns (uint256) {\n if (isL2()) {\n return getEpochManager().numberOfElectedInCurrentSet();\n } else {\n return super.numberValidatorsInCurrentSet();\n }\n }\n}\n"},{"file_path":"lib/openzeppelin-contracts/contracts/ownership/Ownable.sol","source_code":"pragma solidity ^0.5.0;\n\nimport \"../GSN/Context.sol\";\n/**\n * @dev Contract module which provides a basic access control mechanism, where\n * there is an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * This module is used through inheritance. It will make available the modifier\n * `onlyOwner`, which can be applied to your functions to restrict their use to\n * the owner.\n */\ncontract Ownable is Context {\n address private _owner;\n\n event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n /**\n * @dev Initializes the contract setting the deployer as the initial owner.\n */\n constructor () internal {\n address msgSender = _msgSender();\n _owner = msgSender;\n emit OwnershipTransferred(address(0), msgSender);\n }\n\n /**\n * @dev Returns the address of the current owner.\n */\n function owner() public view returns (address) {\n return _owner;\n }\n\n /**\n * @dev Throws if called by any account other than the owner.\n */\n modifier onlyOwner() {\n require(isOwner(), \"Ownable: caller is not the owner\");\n _;\n }\n\n /**\n * @dev Returns true if the caller is the current owner.\n */\n function isOwner() public view returns (bool) {\n return _msgSender() == _owner;\n }\n\n /**\n * @dev Leaves the contract without owner. It will not be possible to call\n * `onlyOwner` functions anymore. Can only be called by the current owner.\n *\n * NOTE: Renouncing ownership will leave the contract without an owner,\n * thereby removing any functionality that is only available to the owner.\n */\n function renounceOwnership() public onlyOwner {\n emit OwnershipTransferred(_owner, address(0));\n _owner = address(0);\n }\n\n /**\n * @dev Transfers ownership of the contract to a new account (`newOwner`).\n * Can only be called by the current owner.\n */\n function transferOwnership(address newOwner) public onlyOwner {\n _transferOwnership(newOwner);\n }\n\n /**\n * @dev Transfers ownership of the contract to a new account (`newOwner`).\n */\n function _transferOwnership(address newOwner) internal {\n require(newOwner != address(0), \"Ownable: new owner is the zero address\");\n emit OwnershipTransferred(_owner, newOwner);\n _owner = newOwner;\n }\n}\n"},{"file_path":"contracts/governance/interfaces/IElection.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\ninterface IElection {\n function vote(\n address group,\n uint256 value,\n address lesser,\n address greater\n ) external returns (bool);\n function activate(address group) external returns (bool);\n function revokeActive(\n address group,\n uint256 value,\n address lesser,\n address greater,\n uint256 index\n ) external returns (bool);\n function revokeAllActive(\n address group,\n address lesser,\n address greater,\n uint256 index\n ) external returns (bool);\n function revokePending(\n address group,\n uint256 value,\n address lesser,\n address greater,\n uint256 index\n ) external returns (bool);\n function markGroupIneligible(address group) external;\n function markGroupEligible(address group, address lesser, address greater) external;\n function allowedToVoteOverMaxNumberOfGroups(address account) external returns (bool);\n function forceDecrementVotes(\n address account,\n uint256 value,\n address[] calldata lessers,\n address[] calldata greaters,\n uint256[] calldata indices\n ) external returns (uint256);\n function setAllowedToVoteOverMaxNumberOfGroups(bool flag) external;\n\n // only owner\n function setElectableValidators(uint256 min, uint256 max) external returns (bool);\n function setMaxNumGroupsVotedFor(uint256 _maxNumGroupsVotedFor) external returns (bool);\n function setElectabilityThreshold(uint256 threshold) external returns (bool);\n\n // only VM\n function distributeEpochRewards(\n address group,\n uint256 value,\n address lesser,\n address greater\n ) external;\n\n // view functions\n function electValidatorSigners() external view returns (address[] memory);\n function electValidatorAccounts() external view returns (address[] memory);\n function electNValidatorSigners(\n uint256 minElectableValidators,\n uint256 maxElectableValidators\n ) external view returns (address[] memory);\n function electNValidatorAccounts(\n uint256 minElectableValidators,\n uint256 maxElectableValidators\n ) external view returns (address[] memory);\n function getElectableValidators() external view returns (uint256, uint256);\n function getElectabilityThreshold() external view returns (uint256);\n function getNumVotesReceivable(address group) external view returns (uint256);\n function getTotalVotes() external view returns (uint256);\n function getActiveVotes() external view returns (uint256);\n function getTotalVotesByAccount(address account) external view returns (uint256);\n function getPendingVotesForGroupByAccount(\n address group,\n address account\n ) external view returns (uint256);\n function getActiveVotesForGroupByAccount(\n address group,\n address account\n ) external view returns (uint256);\n function getTotalVotesForGroupByAccount(\n address group,\n address account\n ) external view returns (uint256);\n function getActiveVoteUnitsForGroupByAccount(\n address group,\n address account\n ) external view returns (uint256);\n function getTotalVotesForGroup(address group) external view returns (uint256);\n function getActiveVotesForGroup(address group) external view returns (uint256);\n function getPendingVotesForGroup(address group) external view returns (uint256);\n function getGroupEligibility(address group) external view returns (bool);\n function getGroupEpochRewardsBasedOnScore(\n address group,\n uint256 totalEpochRewards,\n uint256 groupScore\n ) external view returns (uint256);\n function getGroupsVotedForByAccount(address account) external view returns (address[] memory);\n function getEligibleValidatorGroups() external view returns (address[] memory);\n function getTotalVotesForEligibleValidatorGroups()\n external\n view\n returns (address[] memory, uint256[] memory);\n function getCurrentValidatorSigners() external view returns (address[] memory);\n function canReceiveVotes(address group, uint256 value) external view returns (bool);\n function hasActivatablePendingVotes(address account, address group) external view returns (bool);\n function validatorSignerAddressFromCurrentSet(uint256 index) external view returns (address);\n function numberValidatorsInCurrentSet() external view returns (uint256);\n function owner() external view returns (address);\n}\n"},{"file_path":"contracts/common/interfaces/IEpochManager.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\ninterface IEpochManager {\n function initializeSystem(\n uint256 firstEpochNumber,\n uint256 firstEpochBlock,\n address[] calldata firstElected\n ) external;\n function startNextEpochProcess() external;\n function finishNextEpochProcess(\n address[] calldata groups,\n address[] calldata lessers,\n address[] calldata greaters\n ) external;\n function setToProcessGroups() external;\n function processGroup(address group, address lesser, address greater) external;\n function sendValidatorPayment(address) external;\n function getCurrentEpoch() external view returns (uint256, uint256, uint256, uint256);\n function getEpochByNumber(\n uint256 epochNumber\n ) external view returns (uint256, uint256, uint256, uint256);\n function getEpochByBlockNumber(\n uint256 blockNumber\n ) external view returns (uint256, uint256, uint256, uint256);\n function getEpochNumberOfBlock(uint256) external view returns (uint256);\n function getCurrentEpochNumber() external view returns (uint256);\n function numberOfElectedInCurrentSet() external view returns (uint256);\n function getElectedAccounts() external view returns (address[] memory);\n function getElectedAccountByIndex(uint256 index) external view returns (address);\n function getElectedSigners() external view returns (address[] memory);\n function getElectedSignerByIndex(uint256 index) external view returns (address);\n function epochDuration() external view returns (uint256);\n function firstKnownEpoch() external view returns (uint256);\n function getEpochProcessingState()\n external\n view\n returns (uint256, uint256, uint256, uint256, uint256);\n function systemAlreadyInitialized() external view returns (bool);\n function isBlocked() external view returns (bool);\n function isTimeForNextEpoch() external view returns (bool);\n function isOnEpochProcess() external view returns (bool);\n function getFirstBlockAtEpoch(uint256) external view returns (uint256);\n function getLastBlockAtEpoch(uint256) external view returns (uint256);\n}\n"},{"file_path":"contracts/common/interfaces/IAccounts.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\ninterface IAccounts {\n function setAccountDataEncryptionKey(bytes calldata) external;\n function setMetadataURL(string calldata) external;\n function setName(string calldata) external;\n function setWalletAddress(address, uint8, bytes32, bytes32) external;\n function setAccount(string calldata, bytes calldata, address, uint8, bytes32, bytes32) external;\n\n function authorizeVoteSigner(address, uint8, bytes32, bytes32) external;\n function authorizeValidatorSigner(address, uint8, bytes32, bytes32) external;\n function authorizeValidatorSignerWithPublicKey(\n address,\n uint8,\n bytes32,\n bytes32,\n bytes calldata\n ) external;\n function authorizeAttestationSigner(address, uint8, bytes32, bytes32) external;\n function setEip712DomainSeparator() external;\n function createAccount() external returns (bool);\n\n function setPaymentDelegation(address, uint256) external;\n\n function isAccount(address) external view returns (bool);\n function voteSignerToAccount(address) external view returns (address);\n function validatorSignerToAccount(address) external view returns (address);\n function attestationSignerToAccount(address) external view returns (address);\n function signerToAccount(address) external view returns (address);\n function getAttestationSigner(address) external view returns (address);\n function getValidatorSigner(address) external view returns (address);\n function getVoteSigner(address) external view returns (address);\n function hasAuthorizedVoteSigner(address) external view returns (bool);\n function hasAuthorizedValidatorSigner(address) external view returns (bool);\n function hasAuthorizedAttestationSigner(address) external view returns (bool);\n\n function batchGetMetadataURL(\n address[] calldata\n ) external view returns (uint256[] memory, bytes memory);\n\n function getDataEncryptionKey(address) external view returns (bytes memory);\n function getWalletAddress(address) external view returns (address);\n function getMetadataURL(address) external view returns (string memory);\n\n function getName(address) external view returns (string memory);\n\n function getPaymentDelegation(address) external view returns (address, uint256);\n function isSigner(address, address, bytes32) external view returns (bool);\n}\n"},{"file_path":"contracts/identity/interfaces/IAttestations.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\ninterface IAttestations {\n function revoke(bytes32, uint256) external;\n function withdraw(address) external;\n\n // only owner\n function setAttestationRequestFee(address, uint256) external;\n function setAttestationExpiryBlocks(uint256) external;\n function setSelectIssuersWaitBlocks(uint256) external;\n function setMaxAttestations(uint256) external;\n\n // view functions\n function getUnselectedRequest(bytes32, address) external view returns (uint32, uint32, address);\n function getAttestationIssuers(bytes32, address) external view returns (address[] memory);\n function getAttestationStats(bytes32, address) external view returns (uint32, uint32);\n function batchGetAttestationStats(\n bytes32[] calldata\n ) external view returns (uint256[] memory, address[] memory, uint64[] memory, uint64[] memory);\n function getAttestationState(\n bytes32,\n address,\n address\n ) external view returns (uint8, uint32, address);\n function getCompletableAttestations(\n bytes32,\n address\n ) external view returns (uint32[] memory, address[] memory, uint256[] memory, bytes memory);\n function getAttestationRequestFee(address) external view returns (uint256);\n function getMaxAttestations() external view returns (uint256);\n function validateAttestationCode(\n bytes32,\n address,\n uint8,\n bytes32,\n bytes32\n ) external view returns (address);\n function lookupAccountsForIdentifier(bytes32) external view returns (address[] memory);\n function requireNAttestationsRequested(bytes32, address, uint32) external view;\n}\n"},{"file_path":"contracts/common/Initializable.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\n/**\n * @title Used with proxied contracts that have an `initialize` function.\n * @notice Ensures the `initialize` function:\n * - gets called only once\n * - cannot be called on the logic contract.\n */\ncontract Initializable {\n bool public initialized;\n\n /**\n * @notice Ensures the initializer function cannot be called more than once.\n */\n modifier initializer() {\n require(!initialized, \"contract already initialized\");\n initialized = true;\n _;\n }\n\n /**\n * @notice By default, ensures that the `initialize` function cannot be called\n * on the logic contract.\n * @param testingDeployment When set to true, allows the `initialize` function\n * to be called, which is useful in testing when not setting up with a Proxy.\n */\n constructor(bool testingDeployment) public {\n if (!testingDeployment) {\n initialized = true;\n }\n }\n}\n"},{"file_path":"contracts/common/UsingRegistry.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity ^0.5.13;\n\nimport \"openzeppelin-solidity/contracts/ownership/Ownable.sol\";\nimport \"openzeppelin-solidity/contracts/token/ERC20/IERC20.sol\";\n\nimport \"./interfaces/IAccounts.sol\";\nimport \"./interfaces/IEpochManager.sol\";\nimport \"./interfaces/IFeeCurrencyWhitelist.sol\";\nimport \"./interfaces/IFreezer.sol\";\nimport \"./interfaces/IRegistry.sol\";\nimport \"./interfaces/ICeloUnreleasedTreasury.sol\";\n\nimport \"../governance/interfaces/IElection.sol\";\nimport \"../governance/interfaces/IEpochRewards.sol\";\nimport \"../governance/interfaces/IGovernance.sol\";\nimport \"../governance/interfaces/ILockedGold.sol\";\nimport \"../governance/interfaces/ILockedCelo.sol\";\nimport \"../governance/interfaces/IValidators.sol\";\n\nimport \"../identity/interfaces/IRandom.sol\";\nimport \"../identity/interfaces/IAttestations.sol\";\n\nimport \"../../lib/mento-core/contracts/interfaces/IExchange.sol\";\nimport \"../../lib/mento-core/contracts/interfaces/IReserve.sol\";\nimport \"../../lib/mento-core/contracts/interfaces/IStableToken.sol\";\nimport \"../stability/interfaces/ISortedOracles.sol\";\n\ncontract UsingRegistry is Ownable {\n // solhint-disable state-visibility\n bytes32 constant ACCOUNTS_REGISTRY_ID = keccak256(abi.encodePacked(\"Accounts\"));\n bytes32 constant ATTESTATIONS_REGISTRY_ID = keccak256(abi.encodePacked(\"Attestations\"));\n bytes32 constant DOWNTIME_SLASHER_REGISTRY_ID = keccak256(abi.encodePacked(\"DowntimeSlasher\"));\n bytes32 constant DOUBLE_SIGNING_SLASHER_REGISTRY_ID =\n keccak256(abi.encodePacked(\"DoubleSigningSlasher\"));\n bytes32 constant ELECTION_REGISTRY_ID = keccak256(abi.encodePacked(\"Election\"));\n bytes32 constant EXCHANGE_REGISTRY_ID = keccak256(abi.encodePacked(\"Exchange\"));\n bytes32 constant FEE_CURRENCY_WHITELIST_REGISTRY_ID =\n keccak256(abi.encodePacked(\"FeeCurrencyWhitelist\"));\n bytes32 constant FREEZER_REGISTRY_ID = keccak256(abi.encodePacked(\"Freezer\"));\n bytes32 constant GOLD_TOKEN_REGISTRY_ID = keccak256(abi.encodePacked(\"GoldToken\"));\n bytes32 constant GOVERNANCE_REGISTRY_ID = keccak256(abi.encodePacked(\"Governance\"));\n bytes32 constant GOVERNANCE_SLASHER_REGISTRY_ID =\n keccak256(abi.encodePacked(\"GovernanceSlasher\"));\n bytes32 constant LOCKED_GOLD_REGISTRY_ID = keccak256(abi.encodePacked(\"LockedGold\"));\n bytes32 constant RESERVE_REGISTRY_ID = keccak256(abi.encodePacked(\"Reserve\"));\n bytes32 constant RANDOM_REGISTRY_ID = keccak256(abi.encodePacked(\"Random\"));\n bytes32 constant SORTED_ORACLES_REGISTRY_ID = keccak256(abi.encodePacked(\"SortedOracles\"));\n bytes32 constant STABLE_TOKEN_REGISTRY_ID = keccak256(abi.encodePacked(\"StableToken\"));\n bytes32 constant VALIDATORS_REGISTRY_ID = keccak256(abi.encodePacked(\"Validators\"));\n\n bytes32 constant CELO_TOKEN_REGISTRY_ID = keccak256(abi.encodePacked(\"CeloToken\"));\n bytes32 constant LOCKED_CELO_REGISTRY_ID = keccak256(abi.encodePacked(\"LockedCelo\"));\n bytes32 constant CELO_UNRELEASED_TREASURY_REGISTRY_ID =\n keccak256(abi.encodePacked(\"CeloUnreleasedTreasury\"));\n bytes32 constant EPOCH_REWARDS_REGISTRY_ID = keccak256(abi.encodePacked(\"EpochRewards\"));\n bytes32 constant EPOCH_MANAGER_ENABLER_REGISTRY_ID =\n keccak256(abi.encodePacked(\"EpochManagerEnabler\"));\n bytes32 constant EPOCH_MANAGER_REGISTRY_ID = keccak256(abi.encodePacked(\"EpochManager\"));\n // solhint-enable state-visibility\n\n IRegistry public registry;\n\n event RegistrySet(address indexed registryAddress);\n\n modifier onlyRegisteredContract(bytes32 identifierHash) {\n require(registry.getAddressForOrDie(identifierHash) == msg.sender, \"only registered contract\");\n _;\n }\n\n modifier onlyRegisteredContracts(bytes32[] memory identifierHashes) {\n require(registry.isOneOf(identifierHashes, msg.sender), \"only registered contracts\");\n _;\n }\n\n /**\n * @notice Updates the address pointing to a Registry contract.\n * @param registryAddress The address of a registry contract for routing to other contracts.\n */\n function setRegistry(address registryAddress) public onlyOwner {\n require(registryAddress != address(0), \"Cannot register the null address\");\n registry = IRegistry(registryAddress);\n emit RegistrySet(registryAddress);\n }\n\n function getAccounts() internal view returns (IAccounts) {\n return IAccounts(registry.getAddressForOrDie(ACCOUNTS_REGISTRY_ID));\n }\n\n function getAttestations() internal view returns (IAttestations) {\n return IAttestations(registry.getAddressForOrDie(ATTESTATIONS_REGISTRY_ID));\n }\n\n function getElection() internal view returns (IElection) {\n return IElection(registry.getAddressForOrDie(ELECTION_REGISTRY_ID));\n }\n\n function getExchange() internal view returns (IExchange) {\n return IExchange(registry.getAddressForOrDie(EXCHANGE_REGISTRY_ID));\n }\n\n function getFeeCurrencyWhitelistRegistry() internal view returns (IFeeCurrencyWhitelist) {\n return IFeeCurrencyWhitelist(registry.getAddressForOrDie(FEE_CURRENCY_WHITELIST_REGISTRY_ID));\n }\n\n function getFreezer() internal view returns (IFreezer) {\n return IFreezer(registry.getAddressForOrDie(FREEZER_REGISTRY_ID));\n }\n\n function getGoldToken() internal view returns (IERC20) {\n return IERC20(registry.getAddressForOrDie(GOLD_TOKEN_REGISTRY_ID));\n }\n function getCeloToken() internal view returns (IERC20) {\n return IERC20(registry.getAddressForOrDie(CELO_TOKEN_REGISTRY_ID));\n }\n\n function getGovernance() internal view returns (IGovernance) {\n return IGovernance(registry.getAddressForOrDie(GOVERNANCE_REGISTRY_ID));\n }\n\n function getLockedGold() internal view returns (ILockedGold) {\n return ILockedGold(registry.getAddressForOrDie(LOCKED_GOLD_REGISTRY_ID));\n }\n function getLockedCelo() internal view returns (ILockedCelo) {\n return ILockedCelo(registry.getAddressForOrDie(LOCKED_CELO_REGISTRY_ID));\n }\n\n function getRandom() internal view returns (IRandom) {\n return IRandom(registry.getAddressForOrDie(RANDOM_REGISTRY_ID));\n }\n\n function getReserve() internal view returns (IReserve) {\n return IReserve(registry.getAddressForOrDie(RESERVE_REGISTRY_ID));\n }\n\n function getSortedOracles() internal view returns (ISortedOracles) {\n return ISortedOracles(registry.getAddressForOrDie(SORTED_ORACLES_REGISTRY_ID));\n }\n\n function getStableToken() internal view returns (IStableToken) {\n return IStableToken(registry.getAddressForOrDie(STABLE_TOKEN_REGISTRY_ID));\n }\n\n function getValidators() internal view returns (IValidators) {\n return IValidators(registry.getAddressForOrDie(VALIDATORS_REGISTRY_ID));\n }\n\n function getCeloUnreleasedTreasury() internal view returns (ICeloUnreleasedTreasury) {\n return\n ICeloUnreleasedTreasury(registry.getAddressForOrDie(CELO_UNRELEASED_TREASURY_REGISTRY_ID));\n }\n\n function getEpochRewards() internal view returns (IEpochRewards) {\n return IEpochRewards(registry.getAddressForOrDie(EPOCH_REWARDS_REGISTRY_ID));\n }\n\n function getEpochManager() internal view returns (IEpochManager) {\n return IEpochManager(registry.getAddressForOrDie(EPOCH_MANAGER_REGISTRY_ID));\n }\n}\n"},{"file_path":"lib/openzeppelin-contracts/contracts/math/SafeMath.sol","source_code":"pragma solidity ^0.5.0;\n\n/**\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\n * checks.\n *\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\n * in bugs, because programmers usually assume that an overflow raises an\n * error, which is the standard behavior in high level programming languages.\n * `SafeMath` restores this intuition by reverting the transaction when an\n * operation overflows.\n *\n * Using this library instead of the unchecked operations eliminates an entire\n * class of bugs, so it's recommended to use it always.\n */\nlibrary SafeMath {\n /**\n * @dev Returns the addition of two unsigned integers, reverting on\n * overflow.\n *\n * Counterpart to Solidity's `+` operator.\n *\n * Requirements:\n * - Addition cannot overflow.\n */\n function add(uint256 a, uint256 b) internal pure returns (uint256) {\n uint256 c = a + b;\n require(c >= a, \"SafeMath: addition overflow\");\n\n return c;\n }\n\n /**\n * @dev Returns the subtraction of two unsigned integers, reverting on\n * overflow (when the result is negative).\n *\n * Counterpart to Solidity's `-` operator.\n *\n * Requirements:\n * - Subtraction cannot overflow.\n */\n function sub(uint256 a, uint256 b) internal pure returns (uint256) {\n return sub(a, b, \"SafeMath: subtraction overflow\");\n }\n\n /**\n * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\n * overflow (when the result is negative).\n *\n * Counterpart to Solidity's `-` operator.\n *\n * Requirements:\n * - Subtraction cannot overflow.\n *\n * _Available since v2.4.0._\n */\n function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n require(b <= a, errorMessage);\n uint256 c = a - b;\n\n return c;\n }\n\n /**\n * @dev Returns the multiplication of two unsigned integers, reverting on\n * overflow.\n *\n * Counterpart to Solidity's `*` operator.\n *\n * Requirements:\n * - Multiplication cannot overflow.\n */\n function mul(uint256 a, uint256 b) internal pure returns (uint256) {\n // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\n // benefit is lost if 'b' is also tested.\n // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\n if (a == 0) {\n return 0;\n }\n\n uint256 c = a * b;\n require(c / a == b, \"SafeMath: multiplication overflow\");\n\n return c;\n }\n\n /**\n * @dev Returns the integer division of two unsigned integers. Reverts on\n * division by zero. The result is rounded towards zero.\n *\n * Counterpart to Solidity's `/` operator. Note: this function uses a\n * `revert` opcode (which leaves remaining gas untouched) while Solidity\n * uses an invalid opcode to revert (consuming all remaining gas).\n *\n * Requirements:\n * - The divisor cannot be zero.\n */\n function div(uint256 a, uint256 b) internal pure returns (uint256) {\n return div(a, b, \"SafeMath: division by zero\");\n }\n\n /**\n * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\n * division by zero. The result is rounded towards zero.\n *\n * Counterpart to Solidity's `/` operator. Note: this function uses a\n * `revert` opcode (which leaves remaining gas untouched) while Solidity\n * uses an invalid opcode to revert (consuming all remaining gas).\n *\n * Requirements:\n * - The divisor cannot be zero.\n *\n * _Available since v2.4.0._\n */\n function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n // Solidity only automatically asserts when dividing by 0\n require(b > 0, errorMessage);\n uint256 c = a / b;\n // assert(a == b * c + a % b); // There is no case in which this doesn't hold\n\n return c;\n }\n\n /**\n * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n * Reverts when dividing by zero.\n *\n * Counterpart to Solidity's `%` operator. This function uses a `revert`\n * opcode (which leaves remaining gas untouched) while Solidity uses an\n * invalid opcode to revert (consuming all remaining gas).\n *\n * Requirements:\n * - The divisor cannot be zero.\n */\n function mod(uint256 a, uint256 b) internal pure returns (uint256) {\n return mod(a, b, \"SafeMath: modulo by zero\");\n }\n\n /**\n * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n * Reverts with custom message when dividing by zero.\n *\n * Counterpart to Solidity's `%` operator. This function uses a `revert`\n * opcode (which leaves remaining gas untouched) while Solidity uses an\n * invalid opcode to revert (consuming all remaining gas).\n *\n * Requirements:\n * - The divisor cannot be zero.\n *\n * _Available since v2.4.0._\n */\n function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n require(b != 0, errorMessage);\n return a % b;\n }\n}\n"},{"file_path":"lib/openzeppelin-contracts/contracts/utils/Address.sol","source_code":"pragma solidity ^0.5.5;\n\n/**\n * @dev Collection of functions related to the address type\n */\nlibrary Address {\n /**\n * @dev Returns true if `account` is a contract.\n *\n * [IMPORTANT]\n * ====\n * It is unsafe to assume that an address for which this function returns\n * false is an externally-owned account (EOA) and not a contract.\n *\n * Among others, `isContract` will return false for the following \n * types of addresses:\n *\n * - an externally-owned account\n * - a contract in construction\n * - an address where a contract will be created\n * - an address where a contract lived, but was destroyed\n * ====\n */\n function isContract(address account) internal view returns (bool) {\n // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\n // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\n // for accounts without code, i.e. `keccak256('')`\n bytes32 codehash;\n bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\n // solhint-disable-next-line no-inline-assembly\n assembly { codehash := extcodehash(account) }\n return (codehash != accountHash && codehash != 0x0);\n }\n\n /**\n * @dev Converts an `address` into `address payable`. Note that this is\n * simply a type cast: the actual underlying value is not changed.\n *\n * _Available since v2.4.0._\n */\n function toPayable(address account) internal pure returns (address payable) {\n return address(uint160(account));\n }\n\n /**\n * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\n * `recipient`, forwarding all available gas and reverting on errors.\n *\n * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\n * of certain opcodes, possibly making contracts go over the 2300 gas limit\n * imposed by `transfer`, making them unable to receive funds via\n * `transfer`. {sendValue} removes this limitation.\n *\n * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\n *\n * IMPORTANT: because control is transferred to `recipient`, care must be\n * taken to not create reentrancy vulnerabilities. Consider using\n * {ReentrancyGuard} or the\n * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\n *\n * _Available since v2.4.0._\n */\n function sendValue(address payable recipient, uint256 amount) internal {\n require(address(this).balance >= amount, \"Address: insufficient balance\");\n\n // solhint-disable-next-line avoid-call-value\n (bool success, ) = recipient.call.value(amount)(\"\");\n require(success, \"Address: unable to send value, recipient may have reverted\");\n }\n}\n"},{"file_path":"contracts/common/interfaces/ICeloUnreleasedTreasury.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.9.0;\n\ninterface ICeloUnreleasedTreasury {\n /**\n * @notice Releases the Celo to the specified address.\n * @param to The address to release the amount to.\n * @param amount The amount to release.\n */\n function release(address to, uint256 amount) external;\n\n function getRemainingBalanceToRelease() external view returns (uint256);\n}\n"},{"file_path":"contracts-0.8/common/IsL2Check.sol","source_code":"// SPDX-License-Identifier: LGPL-3.0-only\npragma solidity >=0.5.13 <0.8.20;\n\n/**\n * @title Based on predeploy returns whether this is L1 or L2.\n */\ncontract IsL2Check {\n address constant proxyAdminAddress = 0x4200000000000000000000000000000000000018;\n\n /**\n * @notice Throws if called on L2.\n */\n modifier onlyL1() {\n allowOnlyL1();\n _;\n }\n\n /**\n * @notice Throws if called on L1.\n */\n modifier onlyL2() {\n if (!isL2()) {\n revert(\"This method is not supported in L1.\");\n }\n _;\n }\n\n /**\n * @notice Checks to see if current network is Celo L2.\n * @return Whether or not the current network is a Celo L2.\n */\n function isL2() internal view returns (bool) {\n uint32 size;\n address _addr = proxyAdminAddress;\n assembly {\n size := extcodesize(_addr)\n }\n return (size > 0);\n }\n\n /**\n * @notice Used to restrict usage of the parent function to L1 execution.\n * @dev Reverts if called on a Celo L2 network.\n */\n function allowOnlyL1() internal view {\n if (isL2()) {\n revert(\"This method is no longer supported in L2.\");\n }\n 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solidity ^0.5.13;\n\nimport \"openzeppelin-solidity/contracts/ownership/Ownable.sol\";\nimport \"openzeppelin-solidity/contracts/math/Math.sol\";\nimport \"openzeppelin-solidity/contracts/math/SafeMath.sol\";\nimport \"openzeppelin-solidity/contracts/utils/Address.sol\";\n\nimport \"./interfaces/IGovernance.sol\";\nimport \"./Proposals.sol\";\nimport \"../common/interfaces/IAccounts.sol\";\nimport \"../common/ExtractFunctionSignature.sol\";\nimport \"../common/Initializable.sol\";\nimport \"../common/FixidityLib.sol\";\nimport \"../common/linkedlists/IntegerSortedLinkedList.sol\";\nimport \"../common/UsingRegistry.sol\";\nimport \"../common/PrecompilesOverride.sol\";\nimport \"../common/interfaces/ICeloVersionedContract.sol\";\nimport \"../common/libraries/ReentrancyGuard.sol\";\n\n/**\n * @title A contract for making, passing, and executing on-chain governance proposals.\n */\ncontract Governance is\n IGovernance,\n ICeloVersionedContract,\n Ownable,\n Initializable,\n ReentrancyGuard,\n UsingRegistry,\n PrecompilesOverride\n{\n using Proposals for Proposals.Proposal;\n using FixidityLib for FixidityLib.Fraction;\n using SafeMath for uint256;\n using IntegerSortedLinkedList for SortedLinkedList.List;\n using BytesLib for bytes;\n using Address for address payable; // prettier-ignore\n\n enum VoteValue {\n None,\n Abstain,\n No,\n Yes\n }\n\n struct UpvoteRecord {\n uint256 proposalId;\n uint256 weight;\n }\n\n struct VoteRecord {\n Proposals.VoteValue deprecated_value; // obsolete\n uint256 proposalId;\n uint256 deprecated_weight; // obsolete\n uint256 yesVotes;\n uint256 noVotes;\n uint256 abstainVotes;\n }\n\n struct Voter {\n // Key of the proposal voted for in the proposal queue\n UpvoteRecord upvote;\n uint256 mostRecentReferendumProposal;\n // Maps a `dequeued` index to a voter's vote record.\n mapping(uint256 => VoteRecord) referendumVotes;\n }\n\n struct ContractConstitution {\n FixidityLib.Fraction defaultThreshold;\n // Maps a function ID to a corresponding threshold, overriding the default.\n mapping(bytes4 => FixidityLib.Fraction) functionThresholds;\n }\n\n struct HotfixRecord {\n bool executed;\n bool approved;\n uint256 deprecated_preparedEpoch; // obsolete\n mapping(address => bool) deprecated_whitelisted; // obsolete\n bool councilApproved;\n uint256 executionTimeLimit;\n }\n\n // The baseline is updated as\n // max{floor, (1 - baselineUpdateFactor) * baseline + baselineUpdateFactor * participation}\n struct ParticipationParameters {\n // The average network participation in governance, weighted toward recent proposals.\n FixidityLib.Fraction baseline;\n // The lower bound on the participation baseline.\n FixidityLib.Fraction baselineFloor;\n // The weight of the most recent proposal's participation on the baseline.\n FixidityLib.Fraction baselineUpdateFactor;\n // The proportion of the baseline that constitutes quorum.\n FixidityLib.Fraction baselineQuorumFactor;\n }\n\n uint256 private constant FIXED_HALF = 500000000000000000000000;\n\n Proposals.StageDurations public stageDurations;\n uint256 public queueExpiry;\n uint256 public dequeueFrequency;\n address public approver;\n uint256 public lastDequeue;\n uint256 public concurrentProposals;\n uint256 public proposalCount;\n uint256 public minDeposit;\n mapping(address => uint256) public refundedDeposits;\n mapping(address => ContractConstitution) private constitution;\n mapping(uint256 => Proposals.Proposal) private proposals;\n mapping(address => Voter) internal voters;\n mapping(bytes32 => HotfixRecord) public hotfixes;\n SortedLinkedList.List private queue;\n uint256[] public dequeued;\n uint256[] public emptyIndices;\n ParticipationParameters private participationParameters;\n address public securityCouncil;\n uint256 public hotfixExecutionTimeWindow;\n\n event ApproverSet(address indexed approver);\n\n event ConcurrentProposalsSet(uint256 concurrentProposals);\n\n event MinDepositSet(uint256 minDeposit);\n\n event QueueExpirySet(uint256 queueExpiry);\n\n event DequeueFrequencySet(uint256 dequeueFrequency);\n\n event ReferendumStageDurationSet(uint256 referendumStageDuration);\n\n event ExecutionStageDurationSet(uint256 executionStageDuration);\n\n event ConstitutionSet(address indexed destination, bytes4 indexed functionId, uint256 threshold);\n\n event ProposalQueued(\n uint256 indexed proposalId,\n address indexed proposer,\n uint256 transactionCount,\n uint256 deposit,\n uint256 timestamp\n );\n\n event ProposalUpvoted(uint256 indexed proposalId, address indexed account, uint256 upvotes);\n\n event ProposalUpvoteRevoked(\n uint256 indexed proposalId,\n address indexed account,\n uint256 revokedUpvotes\n );\n\n event ProposalDequeued(uint256 indexed proposalId, uint256 timestamp);\n\n event ProposalApproved(uint256 indexed proposalId);\n\n event ProposalVoted(\n uint256 indexed proposalId,\n address indexed account,\n uint256 value,\n uint256 weight\n );\n\n event ProposalVotedV2(\n uint256 indexed proposalId,\n address indexed account,\n uint256 yesVotes,\n uint256 noVotes,\n uint256 abstainVotes\n );\n\n event ProposalVoteRevoked(\n uint256 indexed proposalId,\n address indexed account,\n uint256 value,\n uint256 weight\n );\n\n event ProposalVoteRevokedV2(\n uint256 indexed proposalId,\n address indexed account,\n uint256 yesVotes,\n uint256 noVotes,\n uint256 abstainVotes\n );\n\n event ProposalExecuted(uint256 indexed proposalId);\n\n event ProposalExpired(uint256 indexed proposalId);\n\n event ParticipationBaselineUpdated(uint256 participationBaseline);\n\n event ParticipationFloorSet(uint256 participationFloor);\n\n event ParticipationBaselineUpdateFactorSet(uint256 baselineUpdateFactor);\n\n event ParticipationBaselineQuorumFactorSet(uint256 baselineQuorumFactor);\n\n event HotfixApproved(bytes32 indexed hash, address approver);\n\n event HotfixPrepared(bytes32 indexed hash, uint256 indexed executionLimit);\n\n event HotfixExecuted(bytes32 indexed hash);\n\n event SecurityCouncilSet(address indexed council);\n\n event HotfixExecutionTimeWindowSet(uint256 timeDelta);\n\n event HotfixRecordReset(bytes32 indexed hash);\n\n /**\n * @notice Ensures a hotfix can be executed only once.\n * @param hash Hash of the hotfix.\n * @dev Reverts if the hotfix has already been executed.\n */\n modifier hotfixNotExecuted(bytes32 hash) {\n require(!hotfixes[hash].executed, \"hotfix already executed\");\n _;\n }\n\n /**\n * @notice Ensures function can only be called by the approver address.\n */\n modifier onlyApprover() {\n require(msg.sender == approver, \"msg.sender not approver\");\n _;\n }\n\n /**\n * @notice Ensures function can only be called by the LockedGold contract.\n */\n modifier onlyLockedGold() {\n require(msg.sender == address(getLockedGold()), \"msg.sender not lockedGold\");\n _;\n }\n\n /**\n * @notice Ensures a hotfix cannot be executed after the time limit.\n * @param hash Hash of the hotfix.\n * @dev Reverts if the hotfix time limit has been reached, or the hotfix is\n * not prepared yet.\n */\n modifier hotfixTimedOut(bytes32 hash) {\n require(hotfixes[hash].executionTimeLimit > 0, \"hotfix not prepared\");\n require(hotfixes[hash].executionTimeLimit < now, \"hotfix execution time limit not reached\");\n _;\n }\n\n /**\n * @notice Sets initialized == true on implementation contracts\n * @param test Set to true to skip implementation initialization\n */\n constructor(bool test) public Initializable(test) {}\n\n /**\n * @notice Used in place of the constructor to allow the contract to be upgradable via proxy.\n * @param registryAddress The address of the registry contract.\n * @param _approver The address that needs to approve proposals to move to the referendum stage.\n * @param _concurrentProposals The number of proposals to dequeue at once.\n * @param _minDeposit The minimum CELO deposit needed to make a proposal.\n * @param _queueExpiry The number of seconds a proposal can stay in the queue before expiring.\n * @param _dequeueFrequency The number of seconds before the next batch of proposals can be\n * dequeued.\n * @param referendumStageDuration The number of seconds users have to vote on a dequeued proposal\n * after the approval stage ends.\n * @param executionStageDuration The number of seconds users have to execute a passed proposal\n * after the referendum stage ends.\n * @param participationBaseline The initial value of the participation baseline.\n * @param participationFloor The participation floor.\n * @param baselineUpdateFactor The weight of the new participation in the baseline update rule.\n * @param baselineQuorumFactor The proportion of the baseline that constitutes quorum.\n * @dev Should be called only once.\n */\n function initialize(\n address registryAddress,\n address _approver,\n uint256 _concurrentProposals,\n uint256 _minDeposit,\n uint256 _queueExpiry,\n uint256 _dequeueFrequency,\n uint256 referendumStageDuration,\n uint256 executionStageDuration,\n uint256 participationBaseline,\n uint256 participationFloor,\n uint256 baselineUpdateFactor,\n uint256 baselineQuorumFactor\n ) external initializer {\n _transferOwnership(msg.sender);\n setRegistry(registryAddress);\n setApprover(_approver);\n setConcurrentProposals(_concurrentProposals);\n setMinDeposit(_minDeposit);\n setQueueExpiry(_queueExpiry);\n setDequeueFrequency(_dequeueFrequency);\n setReferendumStageDuration(referendumStageDuration);\n setExecutionStageDuration(executionStageDuration);\n setParticipationBaseline(participationBaseline);\n setParticipationFloor(participationFloor);\n setBaselineUpdateFactor(baselineUpdateFactor);\n setBaselineQuorumFactor(baselineQuorumFactor);\n // solhint-disable-next-line not-rely-on-time\n lastDequeue = now;\n }\n\n function() external payable {\n require(msg.data.length == 0, \"unknown method\");\n }\n\n /**\n * @notice Updates the ratio of yes:yes+no votes needed for a specific class of proposals to pass.\n * @param destination The destination of proposals for which this threshold should apply.\n * @param functionId The function ID of proposals for which this threshold should apply. Zero\n * will set the default.\n * @param threshold The threshold.\n * @dev If no constitution is explicitly set the default is a simple majority, i.e. 1:2.\n */\n function setConstitution(\n address destination,\n bytes4 functionId,\n uint256 threshold\n ) external onlyOwner {\n require(destination != address(0), \"Destination cannot be zero\");\n require(\n threshold > FIXED_HALF && threshold <= FixidityLib.fixed1().unwrap(),\n \"Threshold has to be greater than majority and not greater than unanimity\"\n );\n if (functionId == 0) {\n constitution[destination].defaultThreshold = FixidityLib.wrap(threshold);\n } else {\n constitution[destination].functionThresholds[functionId] = FixidityLib.wrap(threshold);\n }\n emit ConstitutionSet(destination, functionId, threshold);\n }\n\n /**\n * @notice Updates the address that has permission to whitelist hotfix proposals.\n * @param _council The address that has permission to whitelist hotfix proposals.\n */\n function setSecurityCouncil(address _council) external onlyOwner {\n require(_council != address(0), \"Council cannot be address zero\");\n require(_council != securityCouncil, \"Council unchanged\");\n require(_council != approver, \"Council cannot be approver\");\n\n securityCouncil = _council;\n emit SecurityCouncilSet(_council);\n }\n\n /**\n * @notice Sets the time window during which a hotfix has to be executed.\n * @param timeWindow The time (in seconds) during which a hotfix can be\n * executed after it has been prepared.\n */\n function setHotfixExecutionTimeWindow(uint256 timeWindow) external onlyOwner {\n require(timeWindow > 0, \"Execution time window cannot be zero\");\n hotfixExecutionTimeWindow = timeWindow;\n emit HotfixExecutionTimeWindowSet(timeWindow);\n }\n\n /**\n * @notice Creates a new proposal and adds it to end of the queue with no upvotes.\n * @param values The values of CELO to be sent in the proposed transactions.\n * @param destinations The destination addresses of the proposed transactions.\n * @param data The concatenated data to be included in the proposed transactions.\n * @param dataLengths The lengths of each transaction's data.\n * @return The ID of the newly proposed proposal.\n * @dev The minimum deposit must be included with the proposal, returned if/when the proposal is\n * dequeued.\n */\n function propose(\n uint256[] calldata values,\n address[] calldata destinations,\n bytes calldata data,\n uint256[] calldata dataLengths,\n string calldata descriptionUrl\n ) external payable returns (uint256) {\n dequeueProposalsIfReady();\n require(msg.value >= minDeposit, \"Too small deposit\");\n\n proposalCount = proposalCount.add(1);\n Proposals.Proposal storage proposal = proposals[proposalCount];\n proposal.make(values, destinations, data, dataLengths, msg.sender, msg.value);\n proposal.setDescriptionUrl(descriptionUrl);\n queue.push(proposalCount);\n // solhint-disable-next-line not-rely-on-time\n emit ProposalQueued(proposalCount, msg.sender, proposal.transactions.length, msg.value, now);\n return proposalCount;\n }\n\n /**\n * @notice Upvotes a queued proposal.\n * @param proposalId The ID of the proposal to upvote.\n * @param lesser The ID of the proposal that will be just behind `proposalId` in the queue.\n * @param greater The ID of the proposal that will be just ahead `proposalId` in the queue.\n * @return Whether or not the upvote was made successfully.\n * @dev Provide 0 for `lesser`/`greater` when the proposal will be at the tail/head of the queue.\n * @dev Reverts if the account has already upvoted a proposal in the queue.\n */\n function upvote(\n uint256 proposalId,\n uint256 lesser,\n uint256 greater\n ) external nonReentrant returns (bool) {\n dequeueProposalsIfReady();\n // If acting on an expired proposal, expire the proposal and take no action.\n if (removeIfQueuedAndExpired(proposalId)) {\n return false;\n }\n\n address account = getAccounts().voteSignerToAccount(msg.sender);\n Voter storage voter = voters[account];\n removeIfQueuedAndExpired(voter.upvote.proposalId);\n\n // We can upvote a proposal in the queue if we're not already upvoting a proposal in the queue.\n uint256 weight = getLockedGold().getAccountTotalLockedGold(account);\n require(weight > 0, \"cannot upvote without locking gold\");\n require(queue.contains(proposalId), \"cannot upvote a proposal not in the queue\");\n require(\n voter.upvote.proposalId == 0 || !queue.contains(voter.upvote.proposalId),\n \"cannot upvote more than one queued proposal\"\n );\n uint256 upvotes = queue.getValue(proposalId).add(weight);\n queue.update(proposalId, upvotes, lesser, greater);\n voter.upvote = UpvoteRecord(proposalId, weight);\n emit ProposalUpvoted(proposalId, account, weight);\n return true;\n }\n\n /**\n * @notice Revokes an upvote on a queued proposal.\n * @param lesser The ID of the proposal that will be just behind the previously upvoted proposal\n * in the queue.\n * @param greater The ID of the proposal that will be just ahead of the previously upvoted\n * proposal in the queue.\n * @return Whether or not the upvote was revoked successfully.\n * @dev Provide 0 for `lesser`/`greater` when the proposal will be at the tail/head of the queue.\n */\n function revokeUpvote(uint256 lesser, uint256 greater) external nonReentrant returns (bool) {\n dequeueProposalsIfReady();\n address account = getAccounts().voteSignerToAccount(msg.sender);\n Voter storage voter = voters[account];\n uint256 proposalId = voter.upvote.proposalId;\n require(proposalId != 0, \"Account has no historical upvote\");\n removeIfQueuedAndExpired(proposalId);\n if (queue.contains(proposalId)) {\n queue.update(\n proposalId,\n queue.getValue(proposalId).sub(voter.upvote.weight),\n lesser,\n greater\n );\n emit ProposalUpvoteRevoked(proposalId, account, voter.upvote.weight);\n }\n voter.upvote = UpvoteRecord(0, 0);\n return true;\n }\n\n /**\n * @notice Approves a proposal in the approval stage.\n * @param proposalId The ID of the proposal to approve.\n * @param index The index of the proposal ID in `dequeued`.\n * @return Whether or not the approval was made successfully.\n */\n function approve(uint256 proposalId, uint256 index) external onlyApprover returns (bool) {\n dequeueProposalsIfReady();\n (Proposals.Proposal storage proposal, Proposals.Stage stage) = requireDequeuedAndDeleteExpired(\n proposalId,\n index\n );\n if (!proposal.exists()) {\n return false;\n }\n\n require(!proposal.isApproved(), \"Proposal already approved\");\n require(\n stage == Proposals.Stage.Referendum || stage == Proposals.Stage.Execution,\n \"Proposal not in correct stage\"\n );\n proposal.approved = true;\n // Ensures networkWeight is set by the end of the Referendum stage, even if 0 votes are cast.\n proposal.networkWeight = getLockedGold().getTotalLockedGold();\n emit ProposalApproved(proposalId);\n return true;\n }\n\n /**\n * @notice Votes on a proposal in the referendum stage.\n * @param proposalId The ID of the proposal to vote on.\n * @param index The index of the proposal ID in `dequeued`.\n * @param value Whether to vote yes, no, or abstain.\n * @return Whether or not the vote was cast successfully.\n */\n /* solhint-disable code-complexity */\n function vote(\n uint256 proposalId,\n uint256 index,\n Proposals.VoteValue value\n ) external nonReentrant returns (bool) {\n dequeueProposalsIfReady();\n (Proposals.Proposal storage proposal, Proposals.Stage stage) = requireDequeuedAndDeleteExpired(\n proposalId,\n index\n );\n if (!proposal.exists()) {\n return false;\n }\n\n require(stage == Proposals.Stage.Referendum, \"Incorrect proposal state\");\n require(value != Proposals.VoteValue.None, \"Vote value unset\");\n\n address account = getAccounts().voteSignerToAccount(msg.sender);\n uint256 weight = getLockedGold().getAccountTotalGovernanceVotingPower(account);\n require(weight != 0, \"Voter weight zero\");\n\n _vote(\n proposal,\n proposalId,\n index,\n account,\n value == Proposals.VoteValue.Yes ? weight : 0,\n value == Proposals.VoteValue.No ? weight : 0,\n value == Proposals.VoteValue.Abstain ? weight : 0\n );\n return true;\n }\n\n /**\n * @notice Votes partially on a proposal in the referendum stage.\n * @param proposalId The ID of the proposal to vote on.\n * @param index The index of the proposal ID in `dequeued`.\n * @param yesVotes The yes votes weight.\n * @param noVotes The no votes weight.\n * @param abstainVotes The abstain votes weight.\n * @return Whether or not the vote was cast successfully.\n */\n /* solhint-disable code-complexity */\n function votePartially(\n uint256 proposalId,\n uint256 index,\n uint256 yesVotes,\n uint256 noVotes,\n uint256 abstainVotes\n ) external nonReentrant returns (bool) {\n dequeueProposalsIfReady();\n (Proposals.Proposal storage proposal, Proposals.Stage stage) = requireDequeuedAndDeleteExpired(\n proposalId,\n index\n );\n if (!proposal.exists()) {\n return false;\n }\n\n require(stage == Proposals.Stage.Referendum, \"Incorrect proposal state\");\n\n address account = getAccounts().voteSignerToAccount(msg.sender);\n uint256 totalVotingPower = getLockedGold().getAccountTotalGovernanceVotingPower(account);\n\n require(\n totalVotingPower >= yesVotes.add(noVotes).add(abstainVotes),\n \"Voter doesn't have enough locked Celo (formerly known as Celo Gold)\"\n );\n _vote(proposal, proposalId, index, account, yesVotes, noVotes, abstainVotes);\n\n return true;\n }\n\n /**\n * @notice Revoke votes on all proposals of sender in the referendum stage.\n * @return Whether or not all votes of an account were successfully revoked.\n */\n function revokeVotes() external nonReentrant returns (bool) {\n address account = getAccounts().voteSignerToAccount(msg.sender);\n Voter storage voter = voters[account];\n for (\n uint256 dequeueIndex = 0;\n dequeueIndex < dequeued.length;\n dequeueIndex = dequeueIndex.add(1)\n ) {\n VoteRecord storage voteRecord = voter.referendumVotes[dequeueIndex];\n\n // Skip proposals where there was no vote cast by the user AND\n // ensure vote record proposal matches identifier of dequeued index proposal.\n if (\n voteRecord.proposalId == dequeued[dequeueIndex] &&\n (voteRecord.yesVotes != 0 ||\n voteRecord.noVotes != 0 ||\n voteRecord.abstainVotes != 0 ||\n voteRecord.deprecated_weight != 0)\n ) {\n (Proposals.Proposal storage proposal, Proposals.Stage stage) =\n requireDequeuedAndDeleteExpired(voteRecord.proposalId, dequeueIndex); // prettier-ignore\n\n // only revoke from proposals which are still in referendum\n if (stage == Proposals.Stage.Referendum) {\n if (voteRecord.deprecated_weight != 0) {\n // backward compatibility for transition period - this should be deleted later on\n uint256 previousYes = voteRecord.deprecated_value == Proposals.VoteValue.Yes\n ? voteRecord.deprecated_weight\n : 0;\n uint256 previousNo = voteRecord.deprecated_value == Proposals.VoteValue.No\n ? voteRecord.deprecated_weight\n : 0;\n uint256 previousAbstain = voteRecord.deprecated_value == Proposals.VoteValue.Abstain\n ? voteRecord.deprecated_weight\n : 0;\n proposal.updateVote(previousYes, previousNo, previousAbstain, 0, 0, 0);\n\n proposal.networkWeight = getLockedGold().getTotalLockedGold();\n emit ProposalVoteRevokedV2(\n voteRecord.proposalId,\n account,\n previousYes,\n previousNo,\n previousAbstain\n );\n } else {\n proposal.updateVote(\n voteRecord.yesVotes,\n voteRecord.noVotes,\n voteRecord.abstainVotes,\n 0,\n 0,\n 0\n );\n proposal.networkWeight = getLockedGold().getTotalLockedGold();\n emit ProposalVoteRevokedV2(\n voteRecord.proposalId,\n account,\n voteRecord.yesVotes,\n voteRecord.noVotes,\n voteRecord.abstainVotes\n );\n }\n }\n\n // always delete dequeue vote records for gas refund as they must be expired or revoked\n delete voter.referendumVotes[dequeueIndex];\n }\n }\n\n // reset most recent referendum proposal ID to guarantee isVotingReferendum == false\n voter.mostRecentReferendumProposal = 0;\n return true;\n }\n\n /**\n * @notice Executes a proposal in the execution stage, removing it from `dequeued`.\n * @param proposalId The ID of the proposal to vote on.\n * @param index The index of the proposal ID in `dequeued`.\n * @return Whether or not the proposal was executed successfully.\n * @dev Does not remove the proposal if the execution fails.\n */\n function execute(uint256 proposalId, uint256 index) external nonReentrant returns (bool) {\n dequeueProposalsIfReady();\n (Proposals.Proposal storage proposal, Proposals.Stage stage) = requireDequeuedAndDeleteExpired(\n proposalId,\n index\n );\n bool notExpired = proposal.exists();\n if (notExpired) {\n require(proposal.isApproved(), \"Proposal not approved\");\n require(\n stage == Proposals.Stage.Execution && _isProposalPassing(proposal),\n \"Proposal not in execution stage or not passing\"\n );\n proposal.execute();\n emit ProposalExecuted(proposalId);\n deleteDequeuedProposal(proposal, proposalId, index);\n }\n return notExpired;\n }\n\n /**\n * @notice Approves the hash of a hotfix transaction(s).\n * @param hash The abi encoded keccak256 hash of the hotfix transaction(s) to be approved.\n */\n function approveHotfix(bytes32 hash) external hotfixNotExecuted(hash) {\n require(msg.sender != address(0), \"msg.sender cannot be address zero\");\n require(\n msg.sender == approver || msg.sender == securityCouncil,\n \"msg.sender not approver or Security Council\"\n );\n\n if (msg.sender == approver) {\n hotfixes[hash].approved = true;\n } else {\n hotfixes[hash].councilApproved = true;\n }\n emit HotfixApproved(hash, msg.sender);\n }\n\n /**\n * @notice Gives hotfix a time limit for execution.\n * @param hash The hash of the hotfix to be prepared.\n */\n function prepareHotfix(bytes32 hash) external hotfixNotExecuted(hash) {\n HotfixRecord storage _currentHotfix = hotfixes[hash];\n\n uint256 _currentTime = now;\n require(hotfixExecutionTimeWindow > 0, \"Hotfix execution time window not set\");\n require(_currentHotfix.executionTimeLimit == 0, \"Hotfix already prepared for this timeframe.\");\n require(_currentHotfix.approved, \"Hotfix not approved by approvers.\");\n require(_currentHotfix.councilApproved, \"Hotfix not approved by security council.\");\n\n _currentHotfix.executionTimeLimit = _currentTime.add(hotfixExecutionTimeWindow);\n emit HotfixPrepared(hash, _currentTime.add(hotfixExecutionTimeWindow));\n }\n\n /**\n * @notice Executes a whitelisted proposal.\n * @param values The values of CELO to be sent in the proposed transactions.\n * @param destinations The destination addresses of the proposed transactions.\n * @param data The concatenated data to be included in the proposed transactions.\n * @param dataLengths The lengths of each transaction's data.\n * @param salt Arbitrary salt associated with hotfix which guarantees uniqueness of hash.\n * @dev Reverts if hotfix is already executed, not approved, or not prepared for current epoch.\n */\n function executeHotfix(\n uint256[] calldata values,\n address[] calldata destinations,\n bytes calldata data,\n uint256[] calldata dataLengths,\n bytes32 salt\n ) external {\n bytes32 hash = keccak256(abi.encode(values, destinations, data, dataLengths, salt));\n\n (\n bool approved,\n bool councilApproved,\n bool executed,\n uint256 executionTimeLimit\n ) = getHotfixRecord(hash);\n require(!executed, \"hotfix already executed\");\n require(approved, \"hotfix not approved\");\n require(councilApproved, \"hotfix not approved by security council\");\n require(executionTimeLimit >= now, \"Execution time limit has already been reached.\");\n Proposals.makeMem(values, destinations, data, dataLengths, msg.sender, 0).executeMem();\n\n hotfixes[hash].executed = true;\n emit HotfixExecuted(hash);\n }\n\n /**\n * @notice Withdraws refunded CELO deposits.\n * @return Whether or not the withdraw was successful.\n */\n function withdraw() external nonReentrant returns (bool) {\n uint256 value = refundedDeposits[msg.sender];\n require(value != 0, \"Nothing to withdraw\");\n require(value <= address(this).balance, \"Inconsistent balance\");\n refundedDeposits[msg.sender] = 0;\n msg.sender.sendValue(value);\n return true;\n }\n\n /**\n * @notice Returns whether or not a particular proposal is passing according to the constitution\n * and the participation levels.\n * @param proposalId The ID of the proposal.\n * @return Whether or not the proposal is passing.\n */\n function isProposalPassing(uint256 proposalId) external view returns (bool) {\n return _isProposalPassing(proposals[proposalId]);\n }\n\n /**\n * @notice Returns whether a proposal is dequeued at the given index.\n * @param proposalId The ID of the proposal.\n * @param index The index of the proposal ID in `dequeued`.\n * @return Whether the proposal is in `dequeued`.\n */\n function isDequeuedProposal(uint256 proposalId, uint256 index) external view returns (bool) {\n return _isDequeuedProposal(proposals[proposalId], proposalId, index);\n }\n\n /**\n * @notice Returns whether or not a dequeued proposal has expired.\n * @param proposalId The ID of the proposal.\n * @return Whether or not the dequeued proposal has expired.\n */\n function isDequeuedProposalExpired(uint256 proposalId) external view returns (bool) {\n Proposals.Proposal storage proposal = proposals[proposalId];\n return _isDequeuedProposalExpired(proposal, getProposalDequeuedStage(proposal));\n }\n\n /**\n * @notice Returns the constitution for a particular destination and function ID.\n * @param destination The destination address to get the constitution for.\n * @param functionId The function ID to get the constitution for, zero for the destination\n * default.\n * @return The ratio of yes:no votes needed to exceed in order to pass the proposal.\n */\n function getConstitution(address destination, bytes4 functionId) external view returns (uint256) {\n return _getConstitution(destination, functionId).unwrap();\n }\n\n /**\n * @notice Returns whether or not a particular account is voting on proposals.\n * @param account The address of the account.\n * @return Whether or not the account is voting on proposals.\n */\n function isVoting(address account) external view returns (bool) {\n Voter storage voter = voters[account];\n uint256 upvotedProposal = voter.upvote.proposalId;\n bool isVotingQueue = upvotedProposal != 0 &&\n isQueued(upvotedProposal) &&\n !isQueuedProposalExpired(upvotedProposal);\n Proposals.Proposal storage proposal = proposals[voter.mostRecentReferendumProposal];\n bool isVotingReferendum = (getProposalDequeuedStage(proposal) == Proposals.Stage.Referendum);\n return isVotingQueue || isVotingReferendum;\n }\n\n /**\n * @notice Returns the number of seconds proposals stay in the referendum stage.\n * @return The number of seconds proposals stay in the referendum stage.\n */\n function getReferendumStageDuration() external view returns (uint256) {\n return stageDurations.referendum;\n }\n\n /**\n * @notice Returns the number of seconds proposals stay in the execution stage.\n * @return The number of seconds proposals stay in the execution stage.\n */\n function getExecutionStageDuration() external view returns (uint256) {\n return stageDurations.execution;\n }\n\n /**\n * @notice Returns the participation parameters.\n * @return baseline The participation baseline parameter.\n * @return baselineFloor The participation baseline floor parameter.\n * @return baselineUpdateFactor The participation baseline update factor parameter.\n * @return baselineQuorumFactor The participation baseline quorum factor parameter.\n */\n function getParticipationParameters() external view returns (uint256, uint256, uint256, uint256) {\n return (\n participationParameters.baseline.unwrap(),\n participationParameters.baselineFloor.unwrap(),\n participationParameters.baselineUpdateFactor.unwrap(),\n participationParameters.baselineQuorumFactor.unwrap()\n );\n }\n\n /**\n * @notice Returns whether or not a proposal exists.\n * @param proposalId The ID of the proposal.\n * @return Whether or not the proposal exists.\n */\n function proposalExists(uint256 proposalId) external view returns (bool) {\n return proposals[proposalId].exists();\n }\n\n /**\n * @notice Returns an unpacked proposal struct with its transaction count.\n * @param proposalId The ID of the proposal to unpack.\n * @return proposer\n * @return deposit\n * @return timestamp\n * @return transaction Transaction count.\n * @return description Description url.\n */\n function getProposal(\n uint256 proposalId\n ) external view returns (address, uint256, uint256, uint256, string memory, uint256, bool) {\n return proposals[proposalId].unpack();\n }\n\n /**\n * @notice Returns a specified transaction in a proposal.\n * @param proposalId The ID of the proposal to query.\n * @param index The index of the specified transaction in the proposal's transaction list.\n * @return value Transaction value.\n * @return destination Transaction destination.\n * @return data Transaction data.\n */\n function getProposalTransaction(\n uint256 proposalId,\n uint256 index\n ) external view returns (uint256, address, bytes memory) {\n return proposals[proposalId].getTransaction(index);\n }\n\n /**\n * @notice Returns whether or not a proposal has been approved.\n * @param proposalId The ID of the proposal.\n * @return Whether or not the proposal has been approved.\n */\n function isApproved(uint256 proposalId) external view returns (bool) {\n return proposals[proposalId].isApproved();\n }\n\n /**\n * @notice Returns the referendum vote totals for a proposal.\n * @param proposalId The ID of the proposal.\n * @return yes The yes vote totals.\n * @return no The no vote totals.\n * @return abstain The abstain vote totals.\n */\n function getVoteTotals(uint256 proposalId) external view returns (uint256, uint256, uint256) {\n return proposals[proposalId].getVoteTotals();\n }\n\n /**\n * @notice Returns an accounts vote record on a particular index in `dequeued`.\n * @param account The address of the account to get the record for.\n * @param index The index in `dequeued`.\n * @return The corresponding proposal ID, vote value, and weight.\n * @return The depreciated vote value.\n * @return The deprecieated weight.\n * @return The yes weight.\n * @return The no weight.\n * @return The abstain weight.\n */\n function getVoteRecord(\n address account,\n uint256 index\n ) external view returns (uint256, uint256, uint256, uint256, uint256, uint256) {\n VoteRecord storage record = voters[account].referendumVotes[index];\n return (\n record.proposalId,\n uint256(record.deprecated_value),\n record.deprecated_weight,\n record.yesVotes,\n record.noVotes,\n record.abstainVotes\n );\n }\n\n /**\n * @notice Returns the number of proposals in the queue.\n * @return The number of proposals in the queue.\n */\n function getQueueLength() external view returns (uint256) {\n return queue.list.numElements;\n }\n\n /**\n * @notice Returns the number of upvotes the queued proposal has received.\n * @param proposalId The ID of the proposal.\n * @return The number of upvotes a queued proposal has received.\n */\n function getUpvotes(uint256 proposalId) external view returns (uint256) {\n require(isQueued(proposalId), \"Proposal not queued\");\n return queue.getValue(proposalId);\n }\n\n /**\n * @notice Returns the proposal ID and upvote total for all queued proposals.\n * @return proposalID The proposal ID for all queued proposals.\n * @return total The upvote total for all queued proposals.\n * @dev Note that this includes expired proposals that have yet to be removed from the queue.\n */\n function getQueue() external view returns (uint256[] memory, uint256[] memory) {\n return queue.getElements();\n }\n\n /**\n * @notice Returns the dequeued proposal IDs.\n * @return The dequeued proposal IDs.\n * @dev Note that this includes unused indices with proposalId == 0 from deleted proposals.\n */\n function getDequeue() external view returns (uint256[] memory) {\n return dequeued;\n }\n\n /**\n * @notice Returns the ID of the proposal upvoted by `account` and the weight of that upvote.\n * @param account The address of the account.\n * @return The ID of the proposal upvoted by `account`.\n * @return The weight of that upvote.\n */\n function getUpvoteRecord(address account) external view returns (uint256, uint256) {\n UpvoteRecord memory upvoteRecord = voters[account].upvote;\n return (upvoteRecord.proposalId, upvoteRecord.weight);\n }\n\n /**\n * @notice Returns the ID of the most recently dequeued proposal voted on by `account`.\n * @param account The address of the account.\n * @return The ID of the most recently dequeued proposal voted on by `account`..\n */\n function getMostRecentReferendumProposal(address account) external view returns (uint256) {\n return voters[account].mostRecentReferendumProposal;\n }\n\n /**\n * @notice Returns stage of governance process given proposal is in\n * @param proposalId The ID of the proposal to query.\n * @return proposal stage\n */\n function getProposalStage(uint256 proposalId) external view returns (Proposals.Stage) {\n if (proposalId == 0 || proposalId > proposalCount) {\n return Proposals.Stage.None;\n }\n Proposals.Proposal storage proposal = proposals[proposalId];\n if (isQueued(proposalId)) {\n return\n _isQueuedProposalExpired(proposal) ? Proposals.Stage.Expiration : Proposals.Stage.Queued;\n } else {\n Proposals.Stage stage = getProposalDequeuedStage(proposal);\n return _isDequeuedProposalExpired(proposal, stage) ? Proposals.Stage.Expiration : stage;\n }\n }\n\n /**\n * @notice Returns the storage, major, minor, and patch version of the contract.\n * @return Storage version of the contract.\n * @return Major version of the contract.\n * @return Minor version of the contract.\n * @return Patch version of the contract.\n */\n function getVersionNumber() external pure returns (uint256, uint256, uint256, uint256) {\n return (1, 5, 1, 0);\n }\n\n /**\n * @param values The values of CELO to be sent in the proposed transactions.\n * @param destinations The destination addresses of the proposed transactions.\n * @param data The concatenated data to be included in the proposed transactions.\n * @param dataLengths The lengths of each transaction's data.\n * @param salt Arbitrary salt associated with hotfix which guarantees uniqueness of hash.\n * @return The hash of the hotfix.\n */\n function getHotfixHash(\n uint256[] calldata values,\n address[] calldata destinations,\n bytes calldata data,\n uint256[] calldata dataLengths,\n bytes32 salt\n ) external pure returns (bytes32) {\n return keccak256(abi.encode(values, destinations, data, dataLengths, salt));\n }\n\n /**\n * @notice Updates the address that has permission to approve proposals in the approval stage.\n * @param _approver The address that has permission to approve proposals in the approval stage.\n */\n function setApprover(address _approver) public onlyOwner {\n require(_approver != address(0), \"Approver cannot be 0\");\n require(_approver != approver, \"Approver unchanged\");\n require(_approver != securityCouncil, \"Approver cannot be council\");\n approver = _approver;\n emit ApproverSet(_approver);\n }\n\n /**\n * @notice Updates the number of proposals to dequeue at a time.\n * @param _concurrentProposals The number of proposals to dequeue at a time.\n */\n function setConcurrentProposals(uint256 _concurrentProposals) public onlyOwner {\n require(_concurrentProposals != 0, \"Number of proposals must be larger than zero\");\n require(_concurrentProposals != concurrentProposals, \"Number of proposals unchanged\");\n concurrentProposals = _concurrentProposals;\n emit ConcurrentProposalsSet(_concurrentProposals);\n }\n\n /**\n * @notice Updates the minimum deposit needed to make a proposal.\n * @param _minDeposit The minimum CELO deposit needed to make a proposal.\n */\n function setMinDeposit(uint256 _minDeposit) public onlyOwner {\n require(_minDeposit != 0, \"minDeposit must be larger than 0\");\n require(_minDeposit != minDeposit, \"Minimum deposit unchanged\");\n minDeposit = _minDeposit;\n emit MinDepositSet(_minDeposit);\n }\n\n /**\n * @notice Updates the number of seconds before a queued proposal expires.\n * @param _queueExpiry The number of seconds a proposal can stay in the queue before expiring.\n */\n function setQueueExpiry(uint256 _queueExpiry) public onlyOwner {\n require(_queueExpiry != 0, \"QueueExpiry must be larger than 0\");\n require(_queueExpiry != queueExpiry, \"QueueExpiry unchanged\");\n queueExpiry = _queueExpiry;\n emit QueueExpirySet(_queueExpiry);\n }\n\n /**\n * @notice Updates the minimum number of seconds before the next batch of proposals can be\n * dequeued.\n * @param _dequeueFrequency The number of seconds before the next batch of proposals can be\n * dequeued.\n */\n function setDequeueFrequency(uint256 _dequeueFrequency) public onlyOwner {\n require(_dequeueFrequency != 0, \"dequeueFrequency must be larger than 0\");\n require(_dequeueFrequency != dequeueFrequency, \"dequeueFrequency unchanged\");\n dequeueFrequency = _dequeueFrequency;\n emit DequeueFrequencySet(_dequeueFrequency);\n }\n\n /**\n * @notice Updates the number of seconds proposals stay in the referendum stage.\n * @param referendumStageDuration The number of seconds proposals stay in the referendum stage.\n */\n function setReferendumStageDuration(uint256 referendumStageDuration) public onlyOwner {\n require(referendumStageDuration != 0, \"Duration must be larger than 0\");\n require(referendumStageDuration != stageDurations.referendum, \"Duration unchanged\");\n stageDurations.referendum = referendumStageDuration;\n emit ReferendumStageDurationSet(referendumStageDuration);\n }\n\n /**\n * @notice Updates the number of seconds proposals stay in the execution stage.\n * @param executionStageDuration The number of seconds proposals stay in the execution stage.\n */\n function setExecutionStageDuration(uint256 executionStageDuration) public onlyOwner {\n require(executionStageDuration != 0, \"Duration must be larger than 0\");\n require(executionStageDuration != stageDurations.execution, \"Duration unchanged\");\n stageDurations.execution = executionStageDuration;\n emit ExecutionStageDurationSet(executionStageDuration);\n }\n\n /**\n * @notice Updates the participation baseline.\n * @param participationBaseline The value of the baseline.\n */\n function setParticipationBaseline(uint256 participationBaseline) public onlyOwner {\n FixidityLib.Fraction memory participationBaselineFrac = FixidityLib.wrap(participationBaseline);\n require(\n FixidityLib.isProperFraction(participationBaselineFrac),\n \"Participation baseline greater than one\"\n );\n require(\n !participationBaselineFrac.equals(participationParameters.baseline),\n \"Participation baseline unchanged\"\n );\n participationParameters.baseline = participationBaselineFrac;\n emit ParticipationBaselineUpdated(participationBaseline);\n }\n\n /**\n * @notice Updates the floor of the participation baseline.\n * @param participationFloor The value at which the baseline is floored.\n */\n function setParticipationFloor(uint256 participationFloor) public onlyOwner {\n FixidityLib.Fraction memory participationFloorFrac = FixidityLib.wrap(participationFloor);\n require(\n FixidityLib.isProperFraction(participationFloorFrac),\n \"Participation floor greater than one\"\n );\n require(\n !participationFloorFrac.equals(participationParameters.baselineFloor),\n \"Participation baseline floor unchanged\"\n );\n participationParameters.baselineFloor = participationFloorFrac;\n emit ParticipationFloorSet(participationFloor);\n }\n\n /**\n * @notice Updates the weight of the new participation in the baseline update rule.\n * @param baselineUpdateFactor The new baseline update factor.\n */\n function setBaselineUpdateFactor(uint256 baselineUpdateFactor) public onlyOwner {\n FixidityLib.Fraction memory baselineUpdateFactorFrac = FixidityLib.wrap(baselineUpdateFactor);\n require(\n FixidityLib.isProperFraction(baselineUpdateFactorFrac),\n \"Baseline update factor greater than one\"\n );\n require(\n !baselineUpdateFactorFrac.equals(participationParameters.baselineUpdateFactor),\n \"Baseline update factor unchanged\"\n );\n participationParameters.baselineUpdateFactor = baselineUpdateFactorFrac;\n emit ParticipationBaselineUpdateFactorSet(baselineUpdateFactor);\n }\n\n /**\n * @notice Updates the proportion of the baseline that constitutes quorum.\n * @param baselineQuorumFactor The new baseline quorum factor.\n */\n function setBaselineQuorumFactor(uint256 baselineQuorumFactor) public onlyOwner {\n FixidityLib.Fraction memory baselineQuorumFactorFrac = FixidityLib.wrap(baselineQuorumFactor);\n require(\n FixidityLib.isProperFraction(baselineQuorumFactorFrac),\n \"Baseline quorum factor greater than one\"\n );\n require(\n !baselineQuorumFactorFrac.equals(participationParameters.baselineQuorumFactor),\n \"Baseline quorum factor unchanged\"\n );\n participationParameters.baselineQuorumFactor = baselineQuorumFactorFrac;\n emit ParticipationBaselineQuorumFactorSet(baselineQuorumFactor);\n }\n\n /**\n * @notice Removes the proposals with the most upvotes from the queue, moving them to the\n * approval stage.\n * @dev If any of the top proposals have expired, they are deleted.\n */\n function dequeueProposalsIfReady() public {\n // solhint-disable-next-line not-rely-on-time\n if (now >= lastDequeue.add(dequeueFrequency)) {\n uint256 numProposalsToDequeue = Math.min(concurrentProposals, queue.list.numElements);\n uint256[] memory dequeuedIds = queue.popN(numProposalsToDequeue);\n\n bool wasAnyProposalDequeued = false;\n for (uint256 i = 0; i < numProposalsToDequeue; i = i.add(1)) {\n uint256 proposalId = dequeuedIds[i];\n Proposals.Proposal storage proposal = proposals[proposalId];\n if (_isQueuedProposalExpired(proposal)) {\n emit ProposalExpired(proposalId);\n continue;\n }\n refundedDeposits[proposal.proposer] = refundedDeposits[proposal.proposer].add(\n proposal.deposit\n );\n // solhint-disable-next-line not-rely-on-time\n proposal.timestamp = now;\n if (emptyIndices.length != 0) {\n uint256 indexOfLastEmptyIndex = emptyIndices.length.sub(1);\n dequeued[emptyIndices[indexOfLastEmptyIndex]] = proposalId;\n delete emptyIndices[indexOfLastEmptyIndex];\n emptyIndices.length = indexOfLastEmptyIndex;\n } else {\n dequeued.push(proposalId);\n }\n // solhint-disable-next-line not-rely-on-time\n emit ProposalDequeued(proposalId, now);\n wasAnyProposalDequeued = true;\n }\n if (wasAnyProposalDequeued) {\n // solhint-disable-next-line not-rely-on-time\n lastDequeue = now;\n }\n }\n }\n\n /**\n * @notice When delegator removes votes from delegatee during the time when delegator is voting\n * for governance proposal, this method will remove votes from voted proposal proportionally.\n * @param account The address of the account.\n * @param newVotingPower The adjusted voting power of delegatee.\n */\n function removeVotesWhenRevokingDelegatedVotes(\n address account,\n uint256 newVotingPower\n ) public onlyLockedGold {\n _removeVotesWhenRevokingDelegatedVotes(account, newVotingPower);\n }\n\n /**\n * @notice Resets the hotfix record when after the execution time limit has elapsed.\n * @param hash The abi encoded keccak256 hash of the hotfix transaction.\n */\n function resetHotFixRecord(bytes32 hash) public hotfixNotExecuted(hash) hotfixTimedOut(hash) {\n hotfixes[hash].approved = false;\n hotfixes[hash].councilApproved = false;\n hotfixes[hash].executionTimeLimit = 0;\n emit HotfixRecordReset(hash);\n }\n\n /**\n * @notice Gets information about a hotfix.\n * @param hash The abi encoded keccak256 hash of the hotfix transaction.\n * @return Hotfix approved by approver.\n * @return Hotfix approved by SecurityCouncil.\n * @return Hotfix executed.\n * @return Hotfix execution time limit.\n */\n function getHotfixRecord(bytes32 hash) public view returns (bool, bool, bool, uint256) {\n return (\n hotfixes[hash].approved,\n hotfixes[hash].councilApproved,\n hotfixes[hash].executed,\n hotfixes[hash].executionTimeLimit\n );\n }\n\n /**\n * @notice Returns whether or not a proposal is in the queue.\n * @dev NOTE: proposal may be expired\n * @param proposalId The ID of the proposal.\n * @return Whether or not the proposal is in the queue.\n */\n function isQueued(uint256 proposalId) public view returns (bool) {\n return queue.contains(proposalId);\n }\n\n /**\n * @notice Returns whether or not a queued proposal has expired.\n * @param proposalId The ID of the proposal.\n * @return Whether or not the dequeued proposal has expired.\n */\n function isQueuedProposalExpired(uint256 proposalId) public view returns (bool) {\n return _isQueuedProposalExpired(proposals[proposalId]);\n }\n\n /**\n * @notice Returns max number of votes cast by an account.\n * @param account The address of the account.\n * @return The total number of votes cast by an account.\n */\n function getAmountOfGoldUsedForVoting(address account) public view returns (uint256) {\n Voter storage voter = voters[account];\n\n uint256 upvotedProposalId = voter.upvote.proposalId;\n bool isVotingQueue = upvotedProposalId != 0 &&\n isQueued(upvotedProposalId) &&\n !isQueuedProposalExpired(upvotedProposalId);\n\n // Calculate queue upvote weight using locked gold (upvotes use locked gold weight)\n uint256 queueWeight = 0;\n if (isVotingQueue) {\n queueWeight = getLockedGold().getAccountTotalLockedGold(account);\n }\n\n uint256 maxReferendumUsed = 0;\n for (uint256 index = 0; index < dequeued.length; index = index.add(1)) {\n uint256 proposalId = dequeued[index];\n Proposals.Proposal storage proposal = proposals[proposalId];\n bool isVotingReferendum = (getProposalDequeuedStage(proposal) == Proposals.Stage.Referendum);\n\n if (!isVotingReferendum) {\n continue;\n }\n\n VoteRecord storage voteRecord = voter.referendumVotes[index];\n // skip if vote record is not for this proposal\n if (voteRecord.proposalId != proposalId) {\n continue;\n }\n\n uint256 votesCast = voteRecord.yesVotes.add(voteRecord.noVotes).add(voteRecord.abstainVotes);\n maxReferendumUsed = Math.max(\n maxReferendumUsed,\n // backward compatibility for transition period - this should be updated later on\n votesCast == 0 ? voteRecord.deprecated_weight : votesCast\n );\n }\n\n // Return the maximum of queue upvote weight and referendum votes\n return Math.max(queueWeight, maxReferendumUsed);\n }\n\n /**\n * @notice When delegator removes votes from delegatee during the time when delegator is voting\n * for governance proposal, this method will remove votes from voted proposal proportionally.\n * @param account The address of the account.\n * @param newVotingPower The adjusted voting power of delegatee.\n */\n function _removeVotesWhenRevokingDelegatedVotes(\n address account,\n uint256 newVotingPower\n ) internal {\n Voter storage voter = voters[account];\n\n for (uint256 index = 0; index < dequeued.length; index = index.add(1)) {\n uint256 proposalId = dequeued[index];\n Proposals.Proposal storage proposal = proposals[proposalId];\n bool isVotingReferendum = (getProposalDequeuedStage(proposal) == Proposals.Stage.Referendum);\n\n if (!isVotingReferendum) {\n continue;\n }\n\n VoteRecord storage voteRecord = voter.referendumVotes[index];\n\n // skip if vote record is not for this proposal\n if (voteRecord.proposalId != proposalId) {\n delete voter.referendumVotes[index];\n continue;\n }\n\n uint256 sumOfVotes = voteRecord.yesVotes.add(voteRecord.noVotes).add(voteRecord.abstainVotes);\n\n if (sumOfVotes > newVotingPower) {\n uint256 toRemove = sumOfVotes.sub(newVotingPower);\n\n uint256 abstainToRemove = getVotesPortion(toRemove, voteRecord.abstainVotes, sumOfVotes);\n uint256 yesToRemove = getVotesPortion(toRemove, voteRecord.yesVotes, sumOfVotes);\n uint256 noToRemove = getVotesPortion(toRemove, voteRecord.noVotes, sumOfVotes);\n\n uint256 totalRemoved = abstainToRemove.add(yesToRemove).add(noToRemove);\n\n uint256 yesVotes = voteRecord.yesVotes.sub(yesToRemove);\n uint256 noVotes = voteRecord.noVotes.sub(noToRemove);\n uint256 abstainVotes = voteRecord.abstainVotes.sub(abstainToRemove);\n\n if (totalRemoved < toRemove) {\n // in case of rounding error\n uint256 roundingToRemove = toRemove.sub(totalRemoved);\n\n uint256 toRemoveRounding = Math.min(roundingToRemove, yesVotes);\n yesVotes = yesVotes.sub(toRemoveRounding);\n roundingToRemove = roundingToRemove.sub(toRemoveRounding);\n\n if (roundingToRemove != 0) {\n toRemoveRounding = Math.min(roundingToRemove, noVotes);\n noVotes = noVotes.sub(toRemoveRounding);\n roundingToRemove = roundingToRemove.sub(toRemoveRounding);\n }\n\n if (roundingToRemove != 0) {\n toRemoveRounding = Math.min(roundingToRemove, abstainVotes);\n abstainVotes = abstainVotes.sub(toRemoveRounding);\n }\n }\n\n proposal.updateVote(\n voteRecord.yesVotes,\n voteRecord.noVotes,\n voteRecord.abstainVotes,\n yesVotes,\n noVotes,\n abstainVotes\n );\n\n voteRecord.abstainVotes = abstainVotes;\n voteRecord.yesVotes = yesVotes;\n voteRecord.noVotes = noVotes;\n }\n }\n }\n\n function _getConstitution(\n address destination,\n bytes4 functionId\n ) internal view returns (FixidityLib.Fraction memory) {\n // Default to a simple majority.\n FixidityLib.Fraction memory threshold = FixidityLib.wrap(FIXED_HALF);\n if (constitution[destination].functionThresholds[functionId].unwrap() != 0) {\n threshold = constitution[destination].functionThresholds[functionId];\n } else if (constitution[destination].defaultThreshold.unwrap() != 0) {\n threshold = constitution[destination].defaultThreshold;\n }\n return threshold;\n }\n\n /**\n * @notice Returns the stage of a dequeued proposal.\n * @param proposal The proposal struct.\n * @return The stage of the dequeued proposal.\n * @dev Must be called on a dequeued proposal.\n */\n function getProposalDequeuedStage(\n Proposals.Proposal storage proposal\n ) internal view returns (Proposals.Stage) {\n uint256 stageStartTime = proposal.timestamp.add(stageDurations.referendum).add(\n stageDurations.execution\n );\n // solhint-disable-next-line not-rely-on-time\n if (\n now >= stageStartTime &&\n (proposal.transactions.length != 0 ||\n // proposals with 0 transactions can expire only when not approved or not passing\n !proposal.isApproved() ||\n !_isProposalPassing(proposal))\n ) {\n return Proposals.Stage.Expiration;\n }\n stageStartTime = stageStartTime.sub(stageDurations.execution);\n // solhint-disable-next-line not-rely-on-time\n if (now >= stageStartTime) {\n return Proposals.Stage.Execution;\n }\n return Proposals.Stage.Referendum;\n }\n\n /**\n * @notice Removes a proposal if it is queued and expired.\n * @param proposalId The ID of the proposal to remove.\n * @return Whether the proposal was removed.\n */\n function removeIfQueuedAndExpired(uint256 proposalId) private returns (bool) {\n if (isQueued(proposalId) && isQueuedProposalExpired(proposalId)) {\n queue.remove(proposalId);\n emit ProposalExpired(proposalId);\n return true;\n }\n return false;\n }\n\n /**\n * @notice Requires a proposal is dequeued and removes it if expired.\n * @param proposalId The ID of the proposal.\n * @return The proposal storage struct corresponding to `proposalId`.\n * @return The proposal stage corresponding to `proposalId`.\n */\n function requireDequeuedAndDeleteExpired(\n uint256 proposalId,\n uint256 index\n ) private returns (Proposals.Proposal storage, Proposals.Stage) {\n Proposals.Proposal storage proposal = proposals[proposalId];\n require(_isDequeuedProposal(proposal, proposalId, index), \"Proposal not dequeued\");\n Proposals.Stage stage = getProposalDequeuedStage(proposal);\n if (_isDequeuedProposalExpired(proposal, stage)) {\n deleteDequeuedProposal(proposal, proposalId, index);\n return (proposal, Proposals.Stage.Expiration);\n }\n return (proposal, stage);\n }\n\n /**\n * @notice Votes on a proposal in the referendum stage.\n * @param proposal The proposal struct.\n * @param proposalId The ID of the proposal to vote on.\n * @param index The index of the proposal ID in `dequeued`.\n * @param account Account based on signer.\n * @param yesVotes The yes votes weight.\n * @param noVotes The no votes weight.\n * @param abstainVotes The abstain votes weight.\n * @return Whether or not the proposal is passing.\n */\n function _vote(\n Proposals.Proposal storage proposal,\n uint256 proposalId,\n uint256 index,\n address account,\n uint256 yesVotes,\n uint256 noVotes,\n uint256 abstainVotes\n ) private {\n Voter storage voter = voters[account];\n\n VoteRecord storage previousVoteRecord = voter.referendumVotes[index];\n\n if (previousVoteRecord.proposalId != proposalId) {\n // VoteRecord is being stored based on index (in `dequeued`) rather than proposalId.\n // It can happen that user voted on proposal that later gets deleted.\n // VoteRecord will still stay in `referendumVotes` mapping.\n // Once new proposal is created it might get same index as previous proposal.\n // In such case we need to check whether existing VoteRecord is relevant to new\n // proposal of whether it is just left over data.\n proposal.updateVote(0, 0, 0, yesVotes, noVotes, abstainVotes);\n } else if (previousVoteRecord.deprecated_weight != 0) {\n // backward compatibility for transition period - this should be deleted later on\n proposal.updateVote(\n previousVoteRecord.deprecated_value == Proposals.VoteValue.Yes\n ? previousVoteRecord.deprecated_weight\n : 0,\n previousVoteRecord.deprecated_value == Proposals.VoteValue.No\n ? previousVoteRecord.deprecated_weight\n : 0,\n previousVoteRecord.deprecated_value == Proposals.VoteValue.Abstain\n ? previousVoteRecord.deprecated_weight\n : 0,\n yesVotes,\n noVotes,\n abstainVotes\n );\n } else {\n proposal.updateVote(\n previousVoteRecord.yesVotes,\n previousVoteRecord.noVotes,\n previousVoteRecord.abstainVotes,\n yesVotes,\n noVotes,\n abstainVotes\n );\n }\n\n proposal.networkWeight = getLockedGold().getTotalLockedGold();\n voter.referendumVotes[index] = VoteRecord(\n Proposals.VoteValue.None,\n proposalId,\n 0,\n yesVotes,\n noVotes,\n abstainVotes\n );\n if (proposal.timestamp > proposals[voter.mostRecentReferendumProposal].timestamp) {\n voter.mostRecentReferendumProposal = proposalId;\n }\n\n emit ProposalVotedV2(proposalId, account, yesVotes, noVotes, abstainVotes);\n }\n\n /**\n * @notice Deletes a dequeued proposal.\n * @param proposal The proposal struct.\n * @param proposalId The ID of the proposal to delete.\n * @param index The index of the proposal ID in `dequeued`.\n * @dev Must always be preceded by `isDequeuedProposal`, which checks `index`.\n */\n function deleteDequeuedProposal(\n Proposals.Proposal storage proposal,\n uint256 proposalId,\n uint256 index\n ) private {\n if (proposal.isApproved() && proposal.networkWeight != 0) {\n updateParticipationBaseline(proposal);\n }\n dequeued[index] = 0;\n emptyIndices.push(index);\n delete proposals[proposalId];\n }\n\n /**\n * @notice Updates the participation baseline based on the proportion of BondedDeposit weight\n * that participated in the proposal's Referendum stage.\n * @param proposal The proposal struct.\n */\n function updateParticipationBaseline(Proposals.Proposal storage proposal) private {\n FixidityLib.Fraction memory participation = proposal.getParticipation();\n FixidityLib.Fraction memory participationComponent = participation.multiply(\n participationParameters.baselineUpdateFactor\n );\n FixidityLib.Fraction memory baselineComponent = participationParameters.baseline.multiply(\n FixidityLib.fixed1().subtract(participationParameters.baselineUpdateFactor)\n );\n participationParameters.baseline = participationComponent.add(baselineComponent);\n if (participationParameters.baseline.lt(participationParameters.baselineFloor)) {\n participationParameters.baseline = participationParameters.baselineFloor;\n }\n emit ParticipationBaselineUpdated(participationParameters.baseline.unwrap());\n }\n\n /**\n * @notice Returns whether or not a particular proposal is passing according to the constitution\n * and the participation levels.\n * @param proposal The proposal struct.\n * @return Whether or not the proposal is passing.\n */\n function _isProposalPassing(Proposals.Proposal storage proposal) private view returns (bool) {\n FixidityLib.Fraction memory support = proposal.getSupportWithQuorumPadding(\n participationParameters.baseline.multiply(participationParameters.baselineQuorumFactor)\n );\n\n if (proposal.transactions.length == 0) {\n // default treshold\n FixidityLib.Fraction memory threshold = _getConstitution(address(0), \"\");\n return support.gt(threshold);\n }\n\n for (uint256 i = 0; i < proposal.transactions.length; i = i.add(1)) {\n bytes4 functionId = ExtractFunctionSignature.extractFunctionSignature(\n proposal.transactions[i].data\n );\n FixidityLib.Fraction memory threshold = _getConstitution(\n proposal.transactions[i].destination,\n functionId\n );\n if (support.lte(threshold)) {\n return false;\n }\n }\n return true;\n }\n\n /**\n * @notice Returns whether a proposal is dequeued at the given index.\n * @param proposal The proposal struct.\n * @param proposalId The ID of the proposal.\n * @param index The index of the proposal ID in `dequeued`.\n * @return Whether the proposal is in `dequeued` at index.\n */\n function _isDequeuedProposal(\n Proposals.Proposal storage proposal,\n uint256 proposalId,\n uint256 index\n ) private view returns (bool) {\n require(index < dequeued.length, \"Provided index greater than dequeue length.\");\n return proposal.exists() && dequeued[index] == proposalId;\n }\n\n /**\n * @notice Returns whether or not a dequeued proposal has expired.\n * @param proposal The proposal struct.\n * @return Whether or not the dequeued proposal has expired.\n */\n function _isDequeuedProposalExpired(\n Proposals.Proposal storage proposal,\n Proposals.Stage stage\n ) private view returns (bool) {\n // The proposal is considered expired under the following conditions:\n // 1. Past the referendum stage and not passing.\n // 2. Past the execution stage.\n return ((stage > Proposals.Stage.Execution) ||\n (stage > Proposals.Stage.Referendum && !_isProposalPassing(proposal)));\n }\n\n /**\n * @notice Returns whether or not a queued proposal has expired.\n * @param proposal The proposal struct.\n * @return Whether or not the dequeued proposal has expired.\n */\n function _isQueuedProposalExpired(\n Proposals.Proposal storage proposal\n ) private view returns (bool) {\n // solhint-disable-next-line not-rely-on-time\n return now >= proposal.timestamp.add(queueExpiry);\n }\n\n /**\n * Returns amount of votes that should be removed from delegatee's proposal voting.\n * @param totalToRemove Total votes to be removed.\n * @param votes Yes/no/abstrain votes\n * @param sumOfAllVotes Sum of yes, no, and abstain votes.\n */\n function getVotesPortion(\n uint256 totalToRemove,\n uint256 votes,\n uint256 sumOfAllVotes\n ) private pure returns (uint256) {\n return\n FixidityLib\n .newFixed(totalToRemove)\n .multiply(FixidityLib.newFixedFraction(votes, sumOfAllVotes))\n .fromFixed();\n }\n}\n","creation_status":"success","file_path":"contracts/governance/Governance.sol"}