// SPDX-License-Identifier: MIT
pragma solidity 0.8.26;

import {ECDSA} from 'openzeppelin-contracts/contracts/utils/cryptography/ECDSA.sol';


/**
 * @dev This is an implementation of an on-chain multi-sign. On-chain multi-sign ensures that a quorum of signatures
 * needs to be submitted before the transaction is passed on to the ERC20 contract(in our case). To verify signatures
 * and hash data in a particular way, we use the EIP712.sol scheme: https://github.com/ethereum/EIPs/blob/master/EIPS/eip-712.md.
 *
 * @custom:security-contact bugs@ripple.com
 */
contract MultiSign {

    //keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract,bytes32 salt)")
    bytes32 constant public EIP712DOMAIN_TYPEHASH = 0xd87cd6ef79d4e2b95e15ce8abf732db51ec771f1ca2edccf22a46c729ac56472;

    //keccak256("MultiSignTransaction(address destination,bytes data,uint256 nonce,address executor,uint256 gasLimit)")
    bytes32 constant public MULTISIGN_TYPEHASH = 0xb8dc02dde922989f2f9c331431088d8b7e24696ed816c001c5b82192a1c91a8f;

    //randomly generated salt
    bytes32 constant public SALT = 0x55c2a1c584c6a7013cb797a4622f427c630274bf9e8d9ec26ab9015ddaabcb33;

    //keccak256("MultiSign")
    bytes32 constant public NAME_HASH = 0xa2743967920baf970a18574423a5e903484167f01ff6c1b931ebc9e87d7792b9;

    // keccak256("1")
    bytes32 constant public VERSION_HASH = 0xc89efdaa54c0f20c7adf612882df0950f5a951637e0307cdcb4c672f298b8bc6;

    bytes32 private immutable DOMAIN_SEPARATOR;

    /**
     * A state variable to store the total weight of all signatures required to successfully finish
     * execution of the `execute` method.
     */
    uint256 public quorum;
    /**
     * Every transaction submitted to this contract should have a nonce associated to it just like
     * any other EOA or Contract Account. This state variable holds that value.
     */
    uint256 public nonce;
    address[] private signersArr;
    mapping (address => bool) private isSigner;
    mapping (address => uint8) private weights;

    /**
     * @dev Event emitted when the state of the contract changes.
     *
     * @param account The contract for which the signer information was updated, which is this.
     * @param signers The new array of signer address.
     * @param weights The new array of weights of the signers.
     * @param quorum  The cumulative weight of all signatures should exceed or match this value.
     */
    event SignersChanged(address account, address[] signers, uint8[] weights, uint256 quorum);

    /**
     * @dev Event emitted when the destination contract is called with the provided calldata.
     *
     * @param destination The contract being called with the provided calldata.
     * @param data        The encoded bytes that will lead to execution of a method and change state of the destination
     *                    contract.
     * @param gasLimit    The maximum amount of gas that can be consumed by the destination contract to execute the
     *                    calldata.
     */
    event DestinationCalled(address destination, bytes data, uint256 gasLimit);

    /**
    * Default constructor to initialize the MultiSign contract.
    * Signer addresses submitted to the contract should be ordered by their string values.
    **/
    constructor (address[] memory _signers, uint8[] memory _weights, uint256 _quorum) {
        DOMAIN_SEPARATOR = keccak256(abi.encode(
            EIP712DOMAIN_TYPEHASH,
            NAME_HASH,
            VERSION_HASH,
            block.chainid,
            address(this),
            SALT
        ));

        setSigners_(_signers, _weights, _quorum);
        emit SignersChanged(address(this), _signers, _weights, _quorum);
    }

    /**
     * @dev Returns the list of signer addresses in an array.
     */
    function signers() external view returns (address[] memory) {
        return signersArr;
    }

    /**
     * @dev Given an address of a signer, return the weight of it's signature that gets counted
     * for this account.
     */
    function signerWeight(address signer) external view returns (uint8) {
        return weights[signer];
    }

    // Note that signers_ must be strictly increasing, in order to prevent duplicates
    function setSigners_(address[] memory _signers, uint8[] memory _weights, uint256 _quorum) private {
        require(_signers.length <= 32, "Contract allows adding up to 32 signers only.");
        require(_quorum > 0, "Quorum cannot be 0.");

        // remove old signers from map and set weights to 0
        uint256 existingSignerArrLength = signersArr.length;
        for (uint256 i = 0; i < existingSignerArrLength; ++i) {
            isSigner[signersArr[i]] = false;
            weights[signersArr[i]] = 0;
        }

        // add new signers to map
        uint256 signatureWeights = 0;
        address lastAdd = address(0);
        uint256 newSignerArrLength = _signers.length;
        for (uint256 i = 0; i < newSignerArrLength; ++i) {
            require(_signers[i] > lastAdd, "Addresses should be sorted");
            isSigner[_signers[i]] = true;
            weights[_signers[i]] = _weights[i];
            signatureWeights += _weights[i];
            lastAdd = _signers[i];
        }
        require(_quorum <= signatureWeights, "Quorum must be less than or equal to sum of all signer weights");

        // set signers array and quorum
        signersArr = _signers;
        quorum = _quorum;
    }

    /**
     * @dev This method facilitates changing the signer addresses, their weights and quorum. Since
     * this method changes the state of the contract, it emits the `SignersChanged` event at the
     * end of successful execution.
     * This method can be called by this contract only in order to verify that the signatures are
     * from existing signers with privilege to do so.
     */
    function setSigners(address[] memory _signers, uint8[] memory _weights, uint256 _quorum) external {
        require(msg.sender == address(this), "Only this contract can set signers after signature verification");
        setSigners_(_signers, _weights, _quorum);
        emit SignersChanged(address(this), _signers, _weights, _quorum);
    }

    /**
     * @dev This method is called by an EOA/funding account with the correct set of signatures to eventually
     * make a call to the `destination` with provided call data.
     * Example, calls to the ERC20 contract are made from this method for all MultiSign accounts.
     */
    function execute(
        uint8[] memory sigV, bytes32[] memory sigR, bytes32[] memory sigS, address executor, address destination,
        uint256 gasLimit, bytes calldata data
    ) external {

        require(sigR.length == sigS.length && sigR.length == sigV.length, "Length of signature arrays dont match.");
        require(executor == msg.sender, "Executor has to be the sender");

        bytes32 digest = keccak256(abi.encodePacked(
            "\x19\x01",
            DOMAIN_SEPARATOR,
            keccak256(abi.encode(
                MULTISIGN_TYPEHASH,
                destination,
                keccak256(data),
                nonce,
                executor,
                gasLimit
            ))
        ));

        uint256 signatureWeights = 0;
        address lastAdd = address(0); // cannot have address(0) as an owner
        uint256 signaturesLength = sigV.length;
        for (uint256 i = 0; i < signaturesLength; ++i) {
            address recovered = ECDSA.recover(digest, sigV[i], sigR[i], sigS[i]);
            require(recovered > lastAdd, "Signatures are out of order.");
            require(isSigner[recovered], "Address recovered from signature is not a signer.");
            lastAdd = recovered;
            signatureWeights += weights[recovered];
        }
        require(signatureWeights >= quorum, "Signature weights don't add up to the required quorum");

        // If we make it here all signatures are accounted for.
        nonce = nonce + 1;

        require(destination.code.length > 0, "Destination address should be a contract address");

        bool success = false;
        (success,) = destination.call{gas: gasLimit}(data);
        emit DestinationCalled(destination, data, gasLimit);
        require(success, "Submission to destination failed");
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.20;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS
    }

    /**
     * @dev The signature derives the `address(0)`.
     */
    error ECDSAInvalidSignature();

    /**
     * @dev The signature has an invalid length.
     */
    error ECDSAInvalidSignatureLength(uint256 length);

    /**
     * @dev The signature has an S value that is in the upper half order.
     */
    error ECDSAInvalidSignatureS(bytes32 s);

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with `signature` or an error. This will not
     * return address(0) without also returning an error description. Errors are documented using an enum (error type)
     * and a bytes32 providing additional information about the error.
     *
     * If no error is returned, then the address can be used for verification purposes.
     *
     * The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     */
    function tryRecover(
        bytes32 hash,
        bytes memory signature
    ) internal pure returns (address recovered, RecoverError err, bytes32 errArg) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly ("memory-safe") {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength, bytes32(signature.length));
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, signature);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[ERC-2098 short signatures]
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address recovered, RecoverError err, bytes32 errArg) {
        unchecked {
            bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
            // We do not check for an overflow here since the shift operation results in 0 or 1.
            uint8 v = uint8((uint256(vs) >> 255) + 27);
            return tryRecover(hash, v, r, s);
        }
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     */
    function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, r, vs);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address recovered, RecoverError err, bytes32 errArg) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS, s);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature, bytes32(0));
        }

        return (signer, RecoverError.NoError, bytes32(0));
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, v, r, s);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Optionally reverts with the corresponding custom error according to the `error` argument provided.
     */
    function _throwError(RecoverError error, bytes32 errorArg) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert ECDSAInvalidSignature();
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert ECDSAInvalidSignatureLength(uint256(errorArg));
        } else if (error == RecoverError.InvalidSignatureS) {
            revert ECDSAInvalidSignatureS(errorArg);
        }
    }
}

{
  "remappings": [
    "forge-std/=lib/forge-std/src/",
    "aave-address-book/=lib/aave-address-book/src/",
    "cl-synchronicity-price-adapter/=lib/cl-synchronicity-price-adapter/src/",
    "aave-helpers/=lib/aave-helpers/src/",
    "solidity-utils/=lib/aave-address-book/lib/aave-v3-origin/lib/solidity-utils/src/",
    "aave-v3-origin/=lib/aave-address-book/lib/aave-v3-origin/src/",
    "@openzeppelin/contracts-upgradeable/=lib/aave-address-book/lib/aave-v3-origin/lib/solidity-utils/lib/openzeppelin-contracts-upgradeable/contracts/",
    "@openzeppelin/contracts/=lib/aave-address-book/lib/aave-v3-origin/lib/solidity-utils/lib/openzeppelin-contracts-upgradeable/lib/openzeppelin-contracts/contracts/",
    "aave-v3-origin-tests/=lib/aave-helpers/lib/aave-address-book/lib/aave-v3-origin/tests/",
    "ds-test/=lib/cl-synchronicity-price-adapter/lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/aave-address-book/lib/aave-v3-origin/lib/solidity-utils/lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
    "halmos-cheatcodes/=lib/aave-address-book/lib/aave-v3-origin/lib/solidity-utils/lib/openzeppelin-contracts-upgradeable/lib/halmos-cheatcodes/src/",
    "openzeppelin-contracts-upgradeable/=lib/aave-address-book/lib/aave-v3-origin/lib/solidity-utils/lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts/=lib/aave-address-book/lib/aave-v3-origin/lib/solidity-utils/lib/openzeppelin-contracts-upgradeable/lib/openzeppelin-contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "shanghai",
  "viaIR": false,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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