Contract Source Code (Solidity Standard Json-Input format)

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// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.8.0;

import "./Enum.sol";
import "./SignatureDecoder.sol";

interface ISafe {
    /// @dev Allows a Module to execute a Safe transaction without any further confirmations.
    /// @param to Destination address of module transaction.
    /// @param value Ether value of module transaction.
    /// @param data Data payload of module transaction.
    /// @param operation Operation type of module transaction.
    function execTransactionFromModule(
        address to,
        uint256 value,
        bytes calldata data,
        Enum.Operation operation
    ) external returns (bool success);
}

contract AllowanceModule is SignatureDecoder {
    string public constant NAME = "Allowance Module";
    string public constant VERSION = "0.1.1";

    bytes32 public constant DOMAIN_SEPARATOR_TYPEHASH = 0x47e79534a245952e8b16893a336b85a3d9ea9fa8c573f3d803afb92a79469218;
    // keccak256(
    //     "EIP712Domain(uint256 chainId,address verifyingContract)"
    // );

    bytes32 public constant ALLOWANCE_TRANSFER_TYPEHASH = 0x97c7ed08d51f4a077f71428543a8a2454799e5f6df78c03ef278be094511eda4;
    // keccak256(
    //     "AllowanceTransfer(address safe,address token,address to,uint96 amount,address paymentToken,uint96 payment,uint16 nonce)"
    // );

    // Safe -> Delegate -> Allowance
    mapping(address => mapping(address => mapping(address => Allowance))) public allowances;
    // Safe -> Delegate -> Tokens
    mapping(address => mapping(address => address[])) public tokens;
    // Safe -> Delegates double linked list entry points
    mapping(address => uint48) public delegatesStart;
    // Safe -> Delegates double linked list
    mapping(address => mapping(uint48 => Delegate)) public delegates;

    // We use a double linked list for the delegates. The id is the first 6 bytes.
    // To double check the address in case of collision, the address is part of the struct.
    struct Delegate {
        address delegate;
        uint48 prev;
        uint48 next;
    }

    // The allowance info is optimized to fit into one word of storage.
    struct Allowance {
        uint96 amount;
        uint96 spent;
        uint16 resetTimeMin; // Maximum reset time span is 65k minutes
        uint32 lastResetMin;
        uint16 nonce;
    }

    event AddDelegate(address indexed safe, address delegate);
    event RemoveDelegate(address indexed safe, address delegate);
    event ExecuteAllowanceTransfer(address indexed safe, address delegate, address token, address to, uint96 value, uint16 nonce);
    event PayAllowanceTransfer(address indexed safe, address delegate, address paymentToken, address paymentReceiver, uint96 payment);
    event SetAllowance(address indexed safe, address delegate, address token, uint96 allowanceAmount, uint16 resetTime);
    event ResetAllowance(address indexed safe, address delegate, address token);
    event DeleteAllowance(address indexed safe, address delegate, address token);

    /// @dev Allows to update the allowance for a specified token. This can only be done via a Safe transaction.
    /// @param delegate Delegate whose allowance should be updated.
    /// @param token Token contract address.
    /// @param allowanceAmount allowance in smallest token unit.
    /// @param resetTimeMin Time after which the allowance should reset
    /// @param resetBaseMin Time based on which the reset time should be increased
    function setAllowance(address delegate, address token, uint96 allowanceAmount, uint16 resetTimeMin, uint32 resetBaseMin) public {
        require(delegate != address(0), "delegate != address(0)");
        require(
            delegates[msg.sender][uint48(delegate)].delegate == delegate,
            "delegates[msg.sender][uint48(delegate)].delegate == delegate"
        );
        Allowance memory allowance = getAllowance(msg.sender, delegate, token);
        if (allowance.nonce == 0) {
            // New token
            // Nonce should never be 0 once allowance has been activated
            allowance.nonce = 1;
            tokens[msg.sender][delegate].push(token);
        }
        // Divide by 60 to get current time in minutes
        // solium-disable-next-line security/no-block-members
        uint32 currentMin = uint32(block.timestamp / 60);
        if (resetBaseMin > 0) {
            require(resetBaseMin <= currentMin && resetTimeMin > 0, "resetBaseMin <= currentMin && resetTimeMin > 0");
            allowance.lastResetMin = currentMin - ((currentMin - resetBaseMin) % resetTimeMin);
        } else if (allowance.lastResetMin == 0) {
            allowance.lastResetMin = currentMin;
        }
        allowance.resetTimeMin = resetTimeMin;
        allowance.amount = allowanceAmount;
        updateAllowance(msg.sender, delegate, token, allowance);
        emit SetAllowance(msg.sender, delegate, token, allowanceAmount, resetTimeMin);
    }

    function getAllowance(address safe, address delegate, address token) private view returns (Allowance memory allowance) {
        allowance = allowances[safe][delegate][token];
        // solium-disable-next-line security/no-block-members
        uint32 currentMin = uint32(block.timestamp / 60);
        // Check if we should reset the time. We do this on load to minimize storage read/ writes
        if (allowance.resetTimeMin > 0 && allowance.lastResetMin <= currentMin - allowance.resetTimeMin) {
            allowance.spent = 0;
            // Resets happen in regular intervals and `lastResetMin` should be aligned to that
            allowance.lastResetMin = currentMin - ((currentMin - allowance.lastResetMin) % allowance.resetTimeMin);
        }
        return allowance;
    }

    function updateAllowance(address safe, address delegate, address token, Allowance memory allowance) private {
        allowances[safe][delegate][token] = allowance;
    }

    /// @dev Allows to reset the allowance for a specific delegate and token.
    /// @param delegate Delegate whose allowance should be updated.
    /// @param token Token contract address.
    function resetAllowance(address delegate, address token) public {
        Allowance memory allowance = getAllowance(msg.sender, delegate, token);
        allowance.spent = 0;
        updateAllowance(msg.sender, delegate, token, allowance);
        emit ResetAllowance(msg.sender, delegate, token);
    }

    /// @dev Allows to remove the allowance for a specific delegate and token. This will set all values except the `nonce` to 0.
    /// @param delegate Delegate whose allowance should be updated.
    /// @param token Token contract address.
    function deleteAllowance(address delegate, address token) public {
        Allowance memory allowance = getAllowance(msg.sender, delegate, token);
        allowance.amount = 0;
        allowance.spent = 0;
        allowance.resetTimeMin = 0;
        allowance.lastResetMin = 0;
        updateAllowance(msg.sender, delegate, token, allowance);
        emit DeleteAllowance(msg.sender, delegate, token);
    }

    /// @dev Allows to use the allowance to perform a transfer.
    /// @param safe The Safe whose funds should be used.
    /// @param token Token contract address.
    /// @param to Address that should receive the tokens.
    /// @param amount Amount that should be transferred.
    /// @param paymentToken Token that should be used to pay for the execution of the transfer.
    /// @param payment Amount to should be paid for executing the transfer.
    /// @param delegate Delegate whose allowance should be updated.
    /// @param signature Signature generated by the delegate to authorize the transfer.
    function executeAllowanceTransfer(
        ISafe safe,
        address token,
        address payable to,
        uint96 amount,
        address paymentToken,
        uint96 payment,
        address delegate,
        bytes memory signature
    ) public {
        // Get current state
        Allowance memory allowance = getAllowance(address(safe), delegate, token);
        bytes memory transferHashData = generateTransferHashData(address(safe), token, to, amount, paymentToken, payment, allowance.nonce);

        // Update state
        allowance.nonce = allowance.nonce + 1;
        uint96 newSpent = allowance.spent + amount;
        // Check new spent amount and overflow
        require(newSpent > allowance.spent && newSpent <= allowance.amount, "newSpent > allowance.spent && newSpent <= allowance.amount");
        allowance.spent = newSpent;
        if (payment > 0) {
            // Use updated allowance if token and paymentToken are the same
            Allowance memory paymentAllowance = paymentToken == token ? allowance : getAllowance(address(safe), delegate, paymentToken);
            newSpent = paymentAllowance.spent + payment;
            // Check new spent amount and overflow
            require(
                newSpent > paymentAllowance.spent && newSpent <= paymentAllowance.amount,
                "newSpent > paymentAllowance.spent && newSpent <= paymentAllowance.amount"
            );
            paymentAllowance.spent = newSpent;
            // Update payment allowance if different from allowance
            if (paymentToken != token) updateAllowance(address(safe), delegate, paymentToken, paymentAllowance);
        }
        updateAllowance(address(safe), delegate, token, allowance);

        // Perform external interactions
        // Check signature
        checkSignature(delegate, signature, transferHashData, safe);

        if (payment > 0) {
            // Transfer payment
            // solium-disable-next-line security/no-tx-origin
            transfer(safe, paymentToken, tx.origin, payment);
            // solium-disable-next-line security/no-tx-origin
            emit PayAllowanceTransfer(address(safe), delegate, paymentToken, tx.origin, payment);
        }
        // Transfer token
        transfer(safe, token, to, amount);
        emit ExecuteAllowanceTransfer(address(safe), delegate, token, to, amount, allowance.nonce - 1);
    }

    /// @dev Returns the chain id used by this contract.
    function getChainId() public pure returns (uint256) {
        uint256 id;
        // solium-disable-next-line security/no-inline-assembly
        assembly {
            id := chainid()
        }
        return id;
    }

    /// @dev Generates the data for the transfer hash (required for signing)
    function generateTransferHashData(
        address safe,
        address token,
        address to,
        uint96 amount,
        address paymentToken,
        uint96 payment,
        uint16 nonce
    ) private view returns (bytes memory) {
        uint256 chainId = getChainId();
        bytes32 domainSeparator = keccak256(abi.encode(DOMAIN_SEPARATOR_TYPEHASH, chainId, this));
        bytes32 transferHash = keccak256(abi.encode(ALLOWANCE_TRANSFER_TYPEHASH, safe, token, to, amount, paymentToken, payment, nonce));
        return abi.encodePacked(bytes1(0x19), bytes1(0x01), domainSeparator, transferHash);
    }

    /// @dev Generates the transfer hash that should be signed to authorize a transfer
    function generateTransferHash(
        address safe,
        address token,
        address to,
        uint96 amount,
        address paymentToken,
        uint96 payment,
        uint16 nonce
    ) public view returns (bytes32) {
        return keccak256(generateTransferHashData(safe, token, to, amount, paymentToken, payment, nonce));
    }

    function checkSignature(address expectedDelegate, bytes memory signature, bytes memory transferHashData, ISafe safe) private view {
        address signer = recoverSignature(signature, transferHashData);
        require(
            expectedDelegate == signer && delegates[address(safe)][uint48(signer)].delegate == signer,
            "expectedDelegate == signer && delegates[address(safe)][uint48(signer)].delegate == signer"
        );
    }

    // We use the same format as used for the Safe contract, except that we only support exactly 1 signature and no contract signatures.
    function recoverSignature(bytes memory signature, bytes memory transferHashData) private view returns (address owner) {
        // If there is no signature data msg.sender should be used
        if (signature.length == 0) return msg.sender;
        // Check that the provided signature data is as long as 1 encoded ecsda signature
        require(signature.length == 65, "signatures.length == 65");
        uint8 v;
        bytes32 r;
        bytes32 s;
        (v, r, s) = signatureSplit(signature, 0);
        // If v is 0 then it is a contract signature
        if (v == 0) {
            revert("Contract signatures are not supported by this module");
        } else if (v == 1) {
            // If v is 1 we also use msg.sender, this is so that we are compatible to the Safe signature scheme
            owner = msg.sender;
        } else if (v > 30) {
            // To support eth_sign and similar we adjust v and hash the transferHashData with the Ethereum message prefix before applying ecrecover
            owner = ecrecover(keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", keccak256(transferHashData))), v - 4, r, s);
        } else {
            // Use ecrecover with the messageHash for EOA signatures
            owner = ecrecover(keccak256(transferHashData), v, r, s);
        }
        // 0 for the recovered owner indicates that an error happened.
        require(owner != address(0), "owner != address(0)");
    }

    function transfer(ISafe safe, address token, address payable to, uint96 amount) private {
        if (token == address(0)) {
            // solium-disable-next-line security/no-send
            require(safe.execTransactionFromModule(to, amount, "", Enum.Operation.Call), "Could not execute ether transfer");
        } else {
            bytes memory data = abi.encodeWithSignature("transfer(address,uint256)", to, amount);
            require(safe.execTransactionFromModule(token, 0, data, Enum.Operation.Call), "Could not execute token transfer");
        }
    }

    function getTokens(address safe, address delegate) public view returns (address[] memory) {
        return tokens[safe][delegate];
    }

    function getTokenAllowance(address safe, address delegate, address token) public view returns (uint256[5] memory) {
        Allowance memory allowance = getAllowance(safe, delegate, token);
        return [
            uint256(allowance.amount),
            uint256(allowance.spent),
            uint256(allowance.resetTimeMin),
            uint256(allowance.lastResetMin),
            uint256(allowance.nonce)
        ];
    }

    /// @dev Allows to add a delegate.
    /// @param delegate Delegate that should be added.
    function addDelegate(address delegate) public {
        uint48 index = uint48(delegate);
        require(index != uint(0), "index != uint(0)");
        address currentDelegate = delegates[msg.sender][index].delegate;
        if (currentDelegate != address(0)) {
            // We have a collision for the indices of delegates
            require(currentDelegate == delegate, "currentDelegate == delegate");
            // Delegate already exists, nothing to do
            return;
        }
        uint48 startIndex = delegatesStart[msg.sender];
        delegates[msg.sender][index] = Delegate(delegate, 0, startIndex);
        delegates[msg.sender][startIndex].prev = index;
        delegatesStart[msg.sender] = index;
        emit AddDelegate(msg.sender, delegate);
    }

    /// @dev Allows to remove a delegate.
    /// @param delegate Delegate that should be removed.
    /// @param removeAllowances Indicator if allowances should also be removed. This should be set to `true` unless this causes an out of gas, in this case the allowances should be "manually" deleted via `deleteAllowance`.
    function removeDelegate(address delegate, bool removeAllowances) public {
        Delegate memory current = delegates[msg.sender][uint48(delegate)];
        // Delegate doesn't exists, nothing to do
        if (current.delegate == address(0)) return;
        if (removeAllowances) {
            address[] storage delegateTokens = tokens[msg.sender][delegate];
            for (uint256 i = 0; i < delegateTokens.length; i++) {
                address token = delegateTokens[i];
                // Set all allowance params except the nonce to 0
                Allowance memory allowance = getAllowance(msg.sender, delegate, token);
                allowance.amount = 0;
                allowance.spent = 0;
                allowance.resetTimeMin = 0;
                allowance.lastResetMin = 0;
                updateAllowance(msg.sender, delegate, token, allowance);
                emit DeleteAllowance(msg.sender, delegate, token);
            }
        }
        if (current.prev == 0) {
            delegatesStart[msg.sender] = current.next;
        } else {
            delegates[msg.sender][current.prev].next = current.next;
        }
        if (current.next != 0) {
            delegates[msg.sender][current.next].prev = current.prev;
        }
        delete delegates[msg.sender][uint48(delegate)];
        emit RemoveDelegate(msg.sender, delegate);
    }

    function getDelegates(address safe, uint48 start, uint8 pageSize) public view returns (address[] memory results, uint48 next) {
        results = new address[](pageSize);
        uint8 i = 0;
        uint48 initialIndex = (start != 0) ? start : delegatesStart[safe];
        Delegate memory current = delegates[safe][initialIndex];
        while (current.delegate != address(0) && i < pageSize) {
            results[i] = current.delegate;
            i++;
            current = delegates[safe][current.next];
        }
        next = uint48(current.delegate);
        // Set the length of the array the number that has been used.
        // solium-disable-next-line security/no-inline-assembly
        assembly {
            mstore(results, i)
        }
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.8.0;

/// @title Enum - Collection of enums
/// @author Richard Meissner - <[email protected]>
contract Enum {
    enum Operation {
        Call,
        DelegateCall
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.8.0;

/// @title SignatureDecoder - Decodes signatures that a encoded as bytes
/// @author Ricardo Guilherme Schmidt (Status Research & Development GmbH)
/// @author Richard Meissner - <[email protected]>
contract SignatureDecoder {
    /// @dev Recovers address who signed the message
    /// @param messageHash operation ethereum signed message hash
    /// @param messageSignature message `txHash` signature
    /// @param pos which signature to read
    function recoverKey(bytes32 messageHash, bytes memory messageSignature, uint256 pos) internal pure returns (address) {
        uint8 v;
        bytes32 r;
        bytes32 s;
        (v, r, s) = signatureSplit(messageSignature, pos);
        return ecrecover(messageHash, v, r, s);
    }

    /// @dev divides bytes signature into `uint8 v, bytes32 r, bytes32 s`.
    /// @notice Make sure to peform a bounds check for @param pos, to avoid out of bounds access on @param signatures
    /// @param pos which signature to read. A prior bounds check of this parameter should be performed, to avoid out of bounds access
    /// @param signatures concatenated rsv signatures
    function signatureSplit(bytes memory signatures, uint256 pos) internal pure returns (uint8 v, bytes32 r, bytes32 s) {
        // The signature format is a compact form of:
        //   {bytes32 r}{bytes32 s}{uint8 v}
        // Compact means, uint8 is not padded to 32 bytes.
        // solium-disable-next-line security/no-inline-assembly
        assembly {
            let signaturePos := mul(0x41, pos)
            r := mload(add(signatures, add(signaturePos, 0x20)))
            s := mload(add(signatures, add(signaturePos, 0x40)))
            // Here we are loading the last 32 bytes, including 31 bytes
            // of 's'. There is no 'mload8' to do this.
            //
            // 'byte' is not working due to the Solidity parser, so lets
            // use the second best option, 'and'
            v := and(mload(add(signatures, add(signaturePos, 0x41))), 0xff)
        }
    }
}

{
  "libraries": {},
  "metadata": {
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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