{
  "contractName": "GnosisSafe",
  "abi": [
    {
      "constant": false,
      "inputs": [
        {
          "name": "owner",
          "type": "address"
        },
        {
          "name": "_threshold",
          "type": "uint256"
        }
      ],
      "name": "addOwnerWithThreshold",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "DOMAIN_SEPARATOR_TYPEHASH",
      "outputs": [
        {
          "name": "",
          "type": "bytes32"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "owner",
          "type": "address"
        }
      ],
      "name": "isOwner",
      "outputs": [
        {
          "name": "",
          "type": "bool"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "to",
          "type": "address"
        },
        {
          "name": "value",
          "type": "uint256"
        },
        {
          "name": "data",
          "type": "bytes"
        },
        {
          "name": "operation",
          "type": "uint8"
        }
      ],
      "name": "execTransactionFromModule",
      "outputs": [
        {
          "name": "success",
          "type": "bool"
        }
      ],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "",
          "type": "bytes32"
        }
      ],
      "name": "signedMessages",
      "outputs": [
        {
          "name": "",
          "type": "uint256"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "module",
          "type": "address"
        }
      ],
      "name": "enableModule",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "_threshold",
          "type": "uint256"
        }
      ],
      "name": "changeThreshold",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "",
          "type": "address"
        },
        {
          "name": "",
          "type": "bytes32"
        }
      ],
      "name": "approvedHashes",
      "outputs": [
        {
          "name": "",
          "type": "uint256"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "_masterCopy",
          "type": "address"
        }
      ],
      "name": "changeMasterCopy",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "SENTINEL_MODULES",
      "outputs": [
        {
          "name": "",
          "type": "address"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "SENTINEL_OWNERS",
      "outputs": [
        {
          "name": "",
          "type": "address"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "getOwners",
      "outputs": [
        {
          "name": "",
          "type": "address[]"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "NAME",
      "outputs": [
        {
          "name": "",
          "type": "string"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "nonce",
      "outputs": [
        {
          "name": "",
          "type": "uint256"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "getModules",
      "outputs": [
        {
          "name": "",
          "type": "address[]"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "SAFE_MSG_TYPEHASH",
      "outputs": [
        {
          "name": "",
          "type": "bytes32"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "SAFE_TX_TYPEHASH",
      "outputs": [
        {
          "name": "",
          "type": "bytes32"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "prevModule",
          "type": "address"
        },
        {
          "name": "module",
          "type": "address"
        }
      ],
      "name": "disableModule",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "prevOwner",
          "type": "address"
        },
        {
          "name": "oldOwner",
          "type": "address"
        },
        {
          "name": "newOwner",
          "type": "address"
        }
      ],
      "name": "swapOwner",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "getThreshold",
      "outputs": [
        {
          "name": "",
          "type": "uint256"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "domainSeparator",
      "outputs": [
        {
          "name": "",
          "type": "bytes32"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "prevOwner",
          "type": "address"
        },
        {
          "name": "owner",
          "type": "address"
        },
        {
          "name": "_threshold",
          "type": "uint256"
        }
      ],
      "name": "removeOwner",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "VERSION",
      "outputs": [
        {
          "name": "",
          "type": "string"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "payable": true,
      "stateMutability": "payable",
      "type": "fallback"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": false,
          "name": "txHash",
          "type": "bytes32"
        }
      ],
      "name": "ExecutionFailed",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": false,
          "name": "owner",
          "type": "address"
        }
      ],
      "name": "AddedOwner",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": false,
          "name": "owner",
          "type": "address"
        }
      ],
      "name": "RemovedOwner",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": false,
          "name": "threshold",
          "type": "uint256"
        }
      ],
      "name": "ChangedThreshold",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": false,
          "name": "module",
          "type": "address"
        }
      ],
      "name": "EnabledModule",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": false,
          "name": "module",
          "type": "address"
        }
      ],
      "name": "DisabledModule",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": false,
          "name": "newContract",
          "type": "address"
        }
      ],
      "name": "ContractCreation",
      "type": "event"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "_owners",
          "type": "address[]"
        },
        {
          "name": "_threshold",
          "type": "uint256"
        },
        {
          "name": "to",
          "type": "address"
        },
        {
          "name": "data",
          "type": "bytes"
        }
      ],
      "name": "setup",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "to",
          "type": "address"
        },
        {
          "name": "value",
          "type": "uint256"
        },
        {
          "name": "data",
          "type": "bytes"
        },
        {
          "name": "operation",
          "type": "uint8"
        },
        {
          "name": "safeTxGas",
          "type": "uint256"
        },
        {
          "name": "dataGas",
          "type": "uint256"
        },
        {
          "name": "gasPrice",
          "type": "uint256"
        },
        {
          "name": "gasToken",
          "type": "address"
        },
        {
          "name": "refundReceiver",
          "type": "address"
        },
        {
          "name": "signatures",
          "type": "bytes"
        }
      ],
      "name": "execTransaction",
      "outputs": [
        {
          "name": "success",
          "type": "bool"
        }
      ],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "to",
          "type": "address"
        },
        {
          "name": "value",
          "type": "uint256"
        },
        {
          "name": "data",
          "type": "bytes"
        },
        {
          "name": "operation",
          "type": "uint8"
        }
      ],
      "name": "requiredTxGas",
      "outputs": [
        {
          "name": "",
          "type": "uint256"
        }
      ],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "hashToApprove",
          "type": "bytes32"
        }
      ],
      "name": "approveHash",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "_data",
          "type": "bytes"
        }
      ],
      "name": "signMessage",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "_data",
          "type": "bytes"
        },
        {
          "name": "_signature",
          "type": "bytes"
        }
      ],
      "name": "isValidSignature",
      "outputs": [
        {
          "name": "isValid",
          "type": "bool"
        }
      ],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "message",
          "type": "bytes"
        }
      ],
      "name": "getMessageHash",
      "outputs": [
        {
          "name": "",
          "type": "bytes32"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "to",
          "type": "address"
        },
        {
          "name": "value",
          "type": "uint256"
        },
        {
          "name": "data",
          "type": "bytes"
        },
        {
          "name": "operation",
          "type": "uint8"
        },
        {
          "name": "safeTxGas",
          "type": "uint256"
        },
        {
          "name": "dataGas",
          "type": "uint256"
        },
        {
          "name": "gasPrice",
          "type": "uint256"
        },
        {
          "name": "gasToken",
          "type": "address"
        },
        {
          "name": "refundReceiver",
          "type": "address"
        },
        {
          "name": "_nonce",
          "type": "uint256"
        }
      ],
      "name": "encodeTransactionData",
      "outputs": [
        {
          "name": "",
          "type": "bytes"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "to",
          "type": "address"
        },
        {
          "name": "value",
          "type": "uint256"
        },
        {
          "name": "data",
          "type": "bytes"
        },
        {
          "name": "operation",
          "type": "uint8"
        },
        {
          "name": "safeTxGas",
          "type": "uint256"
        },
        {
          "name": "dataGas",
          "type": "uint256"
        },
        {
          "name": "gasPrice",
          "type": "uint256"
        },
        {
          "name": "gasToken",
          "type": "address"
        },
        {
          "name": "refundReceiver",
          "type": "address"
        },
        {
          "name": "_nonce",
          "type": "uint256"
        }
      ],
      "name": "getTransactionHash",
      "outputs": [
        {
          "name": "",
          "type": "bytes32"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    }
  ],
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  "source": "pragma solidity 0.4.24;\nimport \"./base/BaseSafe.sol\";\nimport \"./common/MasterCopy.sol\";\nimport \"./common/SignatureDecoder.sol\";\nimport \"./common/SecuredTokenTransfer.sol\";\nimport \"./interfaces/ISignatureValidator.sol\";\n\n/// @title Gnosis Safe - A multisignature wallet with support for confirmations using signed messages based on ERC191.\n/// @author Stefan George - <stefan@gnosis.pm>\n/// @author Richard Meissner - <richard@gnosis.pm>\n/// @author Ricardo Guilherme Schmidt - (Status Research & Development GmbH) - Gas Token Payment\ncontract GnosisSafe is MasterCopy, BaseSafe, SignatureDecoder, SecuredTokenTransfer, ISignatureValidator {\n\n    string public constant NAME = \"Gnosis Safe\";\n    string public constant VERSION = \"0.0.2\";\n\n    //keccak256(\n    //    \"EIP712Domain(address verifyingContract)\"\n    //);\n    bytes32 public constant DOMAIN_SEPARATOR_TYPEHASH = 0x035aff83d86937d35b32e04f0ddc6ff469290eef2f1b692d8a815c89404d4749;\n\n    //keccak256(\n    //    \"SafeTx(address to,uint256 value,bytes data,uint8 operation,uint256 safeTxGas,uint256 dataGas,uint256 gasPrice,address gasToken,address refundReceiver,uint256 nonce)\"\n    //);\n    bytes32 public constant SAFE_TX_TYPEHASH = 0x14d461bc7412367e924637b363c7bf29b8f47e2f84869f4426e5633d8af47b20;\n\n    //keccak256(\n    //    \"SafeMessage(bytes message)\"\n    //);\n    bytes32 public constant SAFE_MSG_TYPEHASH = 0x60b3cbf8b4a223d68d641b3b6ddf9a298e7f33710cf3d3a9d1146b5a6150fbca;\n\n    event ExecutionFailed(bytes32 txHash);\n\n    uint256 public nonce;\n    bytes32 public domainSeparator;\n    // Mapping to keep track of all message hashes that have been approve by ALL REQUIRED owners\n    mapping(bytes32 => uint256) public signedMessages;\n    // Mapping to keep track of all hashes (message or transaction) that have been approve by ANY owners\n    mapping(address => mapping(bytes32 => uint256)) public approvedHashes;\n\n    /// @dev Setup function sets initial storage of contract.\n    /// @param _owners List of Safe owners.\n    /// @param _threshold Number of required confirmations for a Safe transaction.\n    /// @param to Contract address for optional delegate call.\n    /// @param data Data payload for optional delegate call.\n    function setup(address[] _owners, uint256 _threshold, address to, bytes data)\n        public\n    {\n        require(domainSeparator == 0, \"Domain Separator already set!\");\n        domainSeparator = keccak256(abi.encode(DOMAIN_SEPARATOR_TYPEHASH, this));\n        setupSafe(_owners, _threshold, to, data);\n    }\n\n    /// @dev Allows to execute a Safe transaction confirmed by required number of owners and then pays the account that submitted the transaction.\n    ///      Note: The fees are always transfered, even if the user transaction fails.\n    /// @param to Destination address of Safe transaction.\n    /// @param value Ether value of Safe transaction.\n    /// @param data Data payload of Safe transaction.\n    /// @param operation Operation type of Safe transaction.\n    /// @param safeTxGas Gas that should be used for the Safe transaction.\n    /// @param dataGas Gas costs for data used to trigger the safe transaction and to pay the payment transfer\n    /// @param gasPrice Gas price that should be used for the payment calculation.\n    /// @param gasToken Token address (or 0 if ETH) that is used for the payment.\n    /// @param refundReceiver Address of receiver of gas payment (or 0 if tx.origin).\n    /// @param signatures Packed signature data ({bytes32 r}{bytes32 s}{uint8 v})\n    function execTransaction(\n        address to,\n        uint256 value,\n        bytes data,\n        Enum.Operation operation,\n        uint256 safeTxGas,\n        uint256 dataGas,\n        uint256 gasPrice,\n        address gasToken,\n        address refundReceiver,\n        bytes signatures\n    )\n        public\n        returns (bool success)\n    {\n        uint256 startGas = gasleft();\n        bytes memory txHashData = encodeTransactionData(\n            to, value, data, operation, // Transaction info\n            safeTxGas, dataGas, gasPrice, gasToken, refundReceiver, // Payment info\n            nonce\n        );\n        require(checkSignatures(keccak256(txHashData), txHashData, signatures, true), \"Invalid signatures provided\");\n        // Increase nonce and execute transaction.\n        nonce++;\n        require(gasleft() >= safeTxGas, \"Not enough gas to execute safe transaction\");\n        // If no safeTxGas has been set and the gasPrice is 0 we assume that all available gas can be used\n        success = execute(to, value, data, operation, safeTxGas == 0 && gasPrice == 0 ? gasleft() : safeTxGas);\n        if (!success) {\n            emit ExecutionFailed(keccak256(txHashData));\n        }\n\n        // We transfer the calculated tx costs to the tx.origin to avoid sending it to intermediate contracts that have made calls\n        if (gasPrice > 0) {\n            handlePayment(startGas, dataGas, gasPrice, gasToken, refundReceiver);\n        }\n    }\n\n    function handlePayment(\n        uint256 gasUsed,\n        uint256 dataGas,\n        uint256 gasPrice,\n        address gasToken,\n        address refundReceiver\n    )\n        private\n    {\n        uint256 amount = ((gasUsed - gasleft()) + dataGas) * gasPrice;\n        // solium-disable-next-line security/no-tx-origin\n        address receiver = refundReceiver == address(0) ? tx.origin : refundReceiver;\n        if (gasToken == address(0)) {\n                // solium-disable-next-line security/no-send\n            require(receiver.send(amount), \"Could not pay gas costs with ether\");\n        } else {\n            require(transferToken(gasToken, receiver, amount), \"Could not pay gas costs with token\");\n        }\n    }\n\n    /**\n    * @dev Should return whether the signature provided is valid for the provided data, hash\n    * @param dataHash Hash of the data (could be either a message hash or transaction hash)\n    * @param data That should be signed (this is passed to an external validator contract)\n    * @param signatures Signature data that should be verified. Can be ECDSA signature, contract signature (EIP-1271) or approved hash.\n    * @param consumeHash Indicates that in case of an approved hash the storage can be freed to save gas\n    * @return a bool upon valid or invalid signature with corresponding _data\n    */\n    function checkSignatures(bytes32 dataHash, bytes data, bytes signatures, bool consumeHash)\n        internal\n        returns (bool)\n    {\n        // Check that the provided signature data is not too short\n        if (signatures.length < threshold * 65) {\n            return false;\n        }\n        // There cannot be an owner with address 0.\n        address lastOwner = address(0);\n        address currentOwner;\n        uint8 v;\n        bytes32 r;\n        bytes32 s;\n        uint256 i;\n        for (i = 0; i < threshold; i++) {\n            (v, r, s) = signatureSplit(signatures, i);\n            // If v is 0 then it is a contract signature\n            if (v == 0) {\n                // When handling contract signatures the address of the contract is encoded into r\n                currentOwner = address(r);\n                bytes memory contractSignature;\n                // solium-disable-next-line security/no-inline-assembly\n                assembly {\n                    // The signature data for contract signatures is appended to the concatenated signatures and the offset is stored in s\n                    contractSignature := add(add(signatures, s), 0x20)\n                }\n                if (!ISignatureValidator(currentOwner).isValidSignature(data, contractSignature)) {\n                    return false;\n                }\n            // If v is 1 then it is an approved hash\n            } else if (v == 1) {\n                // When handling approved hashes the address of the approver is encoded into r\n                currentOwner = address(r);\n                // Hashes are automatically approved by the sender of the message or when they have been pre-approved via a separate transaction\n                if (msg.sender != currentOwner && approvedHashes[currentOwner][dataHash] == 0) {\n                    return false;\n                }\n                // Hash has been marked for consumption. If this hash was pre-approved free storage\n                if (consumeHash && msg.sender != currentOwner) {\n                    approvedHashes[currentOwner][dataHash] = 0;\n                }\n            } else {\n                // Use ecrecover with the messageHash for EOA signatures\n                currentOwner = ecrecover(dataHash, v, r, s);\n            }\n            if (currentOwner <= lastOwner || owners[currentOwner] == 0) {\n                return false;\n            }\n            lastOwner = currentOwner;\n        }\n        return true;\n    }\n\n    /// @dev Allows to estimate a Safe transaction.\n    ///      This method is only meant for estimation purpose, therfore two different protection mechanism against execution in a transaction have been made:\n    ///      1.) The method can only be called from the safe itself\n    ///      2.) The response is returned with a revert\n    ///      When estimating set `from` to the address of the safe.\n    ///      Since the `estimateGas` function includes refunds, call this method to get an estimated of the costs that are deducted from the safe with `execTransaction`\n    /// @param to Destination address of Safe transaction.\n    /// @param value Ether value of Safe transaction.\n    /// @param data Data payload of Safe transaction.\n    /// @param operation Operation type of Safe transaction.\n    /// @return Estimate without refunds and overhead fees (base transaction and payload data gas costs).\n    function requiredTxGas(address to, uint256 value, bytes data, Enum.Operation operation)\n        public\n        authorized\n        returns (uint256)\n    {\n        uint256 startGas = gasleft();\n        // We don't provide an error message here, as we use it to return the estimate\n        // solium-disable-next-line error-reason\n        require(execute(to, value, data, operation, gasleft()));\n        uint256 requiredGas = startGas - gasleft();\n        // Convert response to string and return via error message\n        revert(string(abi.encodePacked(requiredGas)));\n    }\n\n    /**\n    * @dev Marks a hash as approved. This can be used to validate a hash that is used by a signature.\n    * @param hashToApprove The hash that should be marked as approved for signatures that are verified by this contract.\n    */\n    function approveHash(bytes32 hashToApprove)\n        public\n    {\n        require(owners[msg.sender] != 0, \"Only owners can approve a hash\");\n        approvedHashes[msg.sender][hashToApprove] = 1;\n    }\n\n    /**\n    * @dev Marks a message as signed\n    * @param _data Arbitrary length data that should be marked as signed on the behalf of address(this)\n    */\n    function signMessage(bytes _data)\n        public\n        authorized\n    {\n        signedMessages[getMessageHash(_data)] = 1;\n    }\n\n    /**\n    * @dev Should return whether the signature provided is valid for the provided data\n    * @param _data Arbitrary length data signed on the behalf of address(this)\n    * @param _signature Signature byte array associated with _data\n    * @return a bool upon valid or invalid signature with corresponding _data\n    */\n    function isValidSignature(bytes _data, bytes _signature)\n        public\n        returns (bool isValid)\n    {\n        bytes32 messageHash = getMessageHash(_data);\n        if (_signature.length == 0) {\n            isValid = signedMessages[messageHash] != 0;\n        } else {\n            // consumeHash needs to be false, as the state should not be changed\n            isValid = checkSignatures(messageHash, _data, _signature, false);\n        }\n    }\n\n    /// @dev Returns hash of a message that can be signed by owners.\n    /// @param message Message that should be hashed\n    /// @return Message hash.\n    function getMessageHash(\n        bytes message\n    )\n        public\n        view\n        returns (bytes32)\n    {\n        bytes32 safeMessageHash = keccak256(\n            abi.encode(SAFE_MSG_TYPEHASH, keccak256(message))\n        );\n        return keccak256(\n            abi.encodePacked(byte(0x19), byte(1), domainSeparator, safeMessageHash)\n        );\n    }\n\n    /// @dev Returns the bytes that are hashed to be signed by owners.\n    /// @param to Destination address.\n    /// @param value Ether value.\n    /// @param data Data payload.\n    /// @param operation Operation type.\n    /// @param safeTxGas Fas that should be used for the safe transaction.\n    /// @param dataGas Gas costs for data used to trigger the safe transaction.\n    /// @param gasPrice Maximum gas price that should be used for this transaction.\n    /// @param gasToken Token address (or 0 if ETH) that is used for the payment.\n    /// @param refundReceiver Address of receiver of gas payment (or 0 if tx.origin).\n    /// @param _nonce Transaction nonce.\n    /// @return Transaction hash bytes.\n    function encodeTransactionData(\n        address to,\n        uint256 value,\n        bytes data,\n        Enum.Operation operation,\n        uint256 safeTxGas,\n        uint256 dataGas,\n        uint256 gasPrice,\n        address gasToken,\n        address refundReceiver,\n        uint256 _nonce\n    )\n        public\n        view\n        returns (bytes)\n    {\n        bytes32 safeTxHash = keccak256(\n            abi.encode(SAFE_TX_TYPEHASH, to, value, keccak256(data), operation, safeTxGas, dataGas, gasPrice, gasToken, refundReceiver, _nonce)\n        );\n        return abi.encodePacked(byte(0x19), byte(1), domainSeparator, safeTxHash);\n    }\n\n    /// @dev Returns hash to be signed by owners.\n    /// @param to Destination address.\n    /// @param value Ether value.\n    /// @param data Data payload.\n    /// @param operation Operation type.\n    /// @param safeTxGas Fas that should be used for the safe transaction.\n    /// @param dataGas Gas costs for data used to trigger the safe transaction.\n    /// @param gasPrice Maximum gas price that should be used for this transaction.\n    /// @param gasToken Token address (or 0 if ETH) that is used for the payment.\n    /// @param refundReceiver Address of receiver of gas payment (or 0 if tx.origin).\n    /// @param _nonce Transaction nonce.\n    /// @return Transaction hash.\n    function getTransactionHash(\n        address to,\n        uint256 value,\n        bytes data,\n        Enum.Operation operation,\n        uint256 safeTxGas,\n        uint256 dataGas,\n        uint256 gasPrice,\n        address gasToken,\n        address refundReceiver,\n        uint256 _nonce\n    )\n        public\n        view\n        returns (bytes32)\n    {\n        return keccak256(encodeTransactionData(to, value, data, operation, safeTxGas, dataGas, gasPrice, gasToken, refundReceiver, _nonce));\n    }\n}\n",
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                        "typeString": "function (string memory) pure"
                      }
                    },
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                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
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                    }
                  },
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                }
              ]
            },
            "documentation": "@dev Allows to estimate a Safe transaction.\n      This method is only meant for estimation purpose, therfore two different protection mechanism against execution in a transaction have been made:\n      1.) The method can only be called from the safe itself\n      2.) The response is returned with a revert\n      When estimating set `from` to the address of the safe.\n      Since the `estimateGas` function includes refunds, call this method to get an estimated of the costs that are deducted from the safe with `execTransaction`\n @param to Destination address of Safe transaction.\n @param value Ether value of Safe transaction.\n @param data Data payload of Safe transaction.\n @param operation Operation type of Safe transaction.\n @return Estimate without refunds and overhead fees (base transaction and payload data gas costs).",
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                  "src": "9763:10:0",
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                    "typeIdentifier": "t_modifier$__$",
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                  }
                },
                "nodeType": "ModifierInvocation",
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              }
            ],
            "name": "requiredTxGas",
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                  "src": "9714:24:0",
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                    "typeString": "enum Enum.Operation"
                  },
                  "typeName": {
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                    "nodeType": "UserDefinedTypeName",
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                    "src": "9714:14:0",
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                      "typeString": "enum Enum.Operation"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                }
              ],
              "src": "9674:65:0"
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                  },
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              ],
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  "updatedAt": "2018-10-05T14:43:41.464Z"
}