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"bytecodeSha1": "1ce946f6a4eaa185320328620ccf999b9e86db7c", "compiler": { "evm_version": "istanbul", "optimizer": { "enabled": true, "runs": 200 }, "version": "0.8.2+commit.661d1103" }, "contractName": "TransferHelper", "coverageMap": { "branches": { "13": {}, "90": {} }, "statements": { "13": {}, "90": {} } }, "dependencies": [ "OpenZeppelin/openzeppelin-contracts@4.7.3/IERC20" ], "deployedBytecode": "73000000000000000000000000000000000000000030146080604052600080fdfea264697066735822122024e1638666e20e943cc9ddac9b69c5e71d994eb535d46e8de06adf91e970092b64736f6c63430008020033", "deployedSourceMap": "595:1742:90:-:0;;;;;;;;", "language": "Solidity", "natspec": { "kind": "dev", "methods": {}, "version": 1 }, "offset": [ 595, 2337 ], "opcodes": "PUSH20 0x0 ADDRESS EQ PUSH1 0x80 PUSH1 0x40 MSTORE PUSH1 0x0 DUP1 REVERT INVALID LOG2 PUSH5 0x6970667358 0x22 SLT KECCAK256 0x24 0xE1 PUSH4 0x8666E20E SWAP5 EXTCODECOPY 0xC9 0xDD 0xAC SWAP12 PUSH10 0xC5E71D994EB535D46E8D 0xE0 PUSH11 0xDF91E970092B64736F6C63 NUMBER STOP ADDMOD MUL STOP CALLER ", "pcMap": { "0": { "offset": [ 595, 2337 ], "op": "PUSH20", "path": "90", "value": "0x0" }, "21": { "fn": null, "offset": [ 595, 2337 ], "op": "ADDRESS", "path": "90" }, "22": { "fn": null, "offset": [ 595, 2337 ], "op": "EQ", "path": "90" }, "23": { "fn": null, "offset": [ 595, 2337 ], "op": "PUSH1", "path": "90", "value": "0x80" }, "25": { "fn": null, "offset": [ 595, 2337 ], "op": "PUSH1", "path": "90", "value": "0x40" }, "27": { "fn": null, "offset": [ 595, 2337 ], "op": "MSTORE", "path": "90" }, "28": { "fn": null, "offset": [ 595, 2337 ], "op": "PUSH1", "path": "90", "value": "0x0" }, "30": { "fn": null, "offset": [ 595, 2337 ], "op": "DUP1", "path": "90" }, "31": { "fn": null, "offset": [ 595, 2337 ], "op": "REVERT", "path": "90" } }, "sha1": "ab55e52ea80afe522c3bd9f6cafb7331669798fc", "source": "// SPDX-License-Identifier: Apache-2.0\npragma solidity 0.8.2;\n\nimport \"@openzeppelin/contracts/token/ERC20/IERC20.sol\";\n\n// inspired/informed by\n// https://soliditydeveloper.com/safe-erc20\n// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.7.3/contracts/token/ERC20/ERC20.sol\n// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.7.3/contracts/token/ERC20/utils/SafeERC20.sol\n// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.7.3/contracts/utils/Address.sol\n// https://github.com/Uniswap/solidity-lib/blob/master/contracts/libraries/TransferHelper.sol\nlibrary TransferHelper {\n\n event LogTransferHelperInputValidation1Failed(bool tokenIsContract, address from, address to);\n event LogTransferHelperInputValidation2Failed(uint256 balance, uint256 allowance);\n event LogTransferHelperCallFailed(bool callSuccess, uint256 returnDataLength, bytes returnData);\n\n function unifiedTransferFrom(\n IERC20 token,\n address from,\n address to,\n uint256 value\n )\n internal\n returns(bool success)\n {\n // input validation step 1\n address tokenAddress = address(token);\n bool tokenIsContract = (tokenAddress.code.length > 0);\n if (from == address(0) || to == address (0) || !tokenIsContract) {\n emit LogTransferHelperInputValidation1Failed(tokenIsContract, from, to);\n return false;\n }\n \n // input validation step 2\n uint256 balance = token.balanceOf(from);\n uint256 allowance = token.allowance(from, address(this));\n if (balance < value || allowance < value) {\n emit LogTransferHelperInputValidation2Failed(balance, allowance);\n return false;\n }\n\n // low-level call to transferFrom\n // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));\n (bool callSuccess, bytes memory data) = address(token).call(\n abi.encodeWithSelector(\n 0x23b872dd, \n from, \n to, \n value));\n\n success = callSuccess && (false\n || data.length == 0 \n || (data.length == 32 && abi.decode(data, (bool))));\n\n if (!success) {\n emit LogTransferHelperCallFailed(callSuccess, data.length, data);\n }\n }\n}", "sourceMap": "595:1742:90:-:0;;;;;;;;;;;;;;;-1:-1:-1;;;595:1742:90;;;;;;;;;;;;;;;;;", "sourcePath": "contracts/shared/TransferHelper.sol", "type": "library" }