Contract Source Code (Solidity Multiple files format)

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pragma solidity ^0.4.23;

import "./IERC20.sol";


contract Invoice {
  address public owner;
  address public quoteSigner;
  mapping(bytes32 => bool) public isPaid;

  event PaymentAccepted(bytes32 indexed hash, address indexed tokenContract,  uint time, uint value);


  constructor(address valueSigner) public {
    owner = msg.sender;
    quoteSigner = valueSigner;
  }

  function isValidPayment(
    uint value,
    uint gasPrice,
    uint expiration,
    bytes32 payload,
    bytes32 hash,
    uint8 v,
    bytes32 r,
    bytes32 s,
    address tokenContract
  ) public view returns(bool valid) {
    bool isValid = !isPaid[payload];
    isValid = isValid && block.timestamp <= expiration;
    isValid = isValid && tx.gasprice >= gasPrice;
    bytes memory prefix = "\x19Ethereum Signed Message:\n32";
    bytes32 ourHash = keccak256(abi.encodePacked(value, gasPrice, expiration, payload, tokenContract));
    bytes32 payloadHash = keccak256(abi.encodePacked(prefix, ourHash));
    isValid = isValid && ourHash == hash;
    isValid = isValid && (ecrecover(payloadHash, v, r, s) == quoteSigner);
    return isValid;
  }

  function validatePayment(
    uint value,
    uint gasPrice,
    uint expiration,
    bytes32 payload,
    bytes32 hash,
    uint8 v,
    bytes32 r,
    bytes32 s,
    address tokenContract
  ) public view returns(bool valid) {
    require(isPaid[payload] == false, "Already been paid");
    require(block.timestamp <= expiration, "Payment is late");
    require(tx.gasprice >= gasPrice, "Gas price lower than required");
    bytes memory prefix = "\x19Ethereum Signed Message:\n32";
    bytes32 ourHash = keccak256(abi.encodePacked(value, gasPrice, expiration, payload, tokenContract));
    bytes32 payloadHash = keccak256(abi.encodePacked(prefix, ourHash));
    require(ourHash == hash, "Hash mismatch");
    require(ecrecover(payloadHash, v, r, s) == quoteSigner, "Signature mismatch for quote");
    return true;
  }


  function pay(
    uint value,
    uint gasPrice,
    uint expiration,
    bytes32 payload,
    bytes32 hash,
    uint8 v,
    bytes32 r,
    bytes32 s,
    address tokenContract
  ) public payable {
    if(tokenContract == 0x0) {
      require(validatePayment(msg.value, gasPrice, expiration, payload, hash, v, r, s, tokenContract), "Only accept valid payments");
    } else {
      IERC20 token = IERC20(tokenContract);
      require(token.allowance(msg.sender, address(this)) >= value, "Must have enough tokens to pay");
      require(validatePayment(value, gasPrice, expiration, payload, hash, v, r, s, tokenContract), "Only accept valid payments");
      require(token.transferFrom(msg.sender, address(this), value), "Transfer must succeed");
    }
    isPaid[payload] = true;
    emit PaymentAccepted(hash, tokenContract, block.timestamp, value);
  }

  modifier isAdmin() {
    require(msg.sender == owner, "Must be the contract owner");
    _;
  }

  function withdraw(address tokenContract) public isAdmin {
    if(tokenContract == 0x0) {
      owner.transfer(address(this).balance);
    } else {
      IERC20 token = IERC20(tokenContract);
      uint balance = token.balanceOf(address(this));
      require(token.transfer(owner, balance), "Must succeed withdrawing tokens");
    }
  }

  function setSigner(address newQuoteSigner) public isAdmin {
    quoteSigner = newQuoteSigner;
  }
  function setAdmin(address newAdmin) public isAdmin {
    owner = newAdmin;
  }
}

pragma solidity ^0.4.23;

contract IERC20 {
  function totalSupply() public constant returns (uint);
  function balanceOf(address tokenOwner) public constant returns (uint balance);
  function allowance(address tokenOwner, address spender) public constant returns (uint remaining);
  function transfer(address to, uint tokens) public returns (bool success);
  function approve(address spender, uint tokens) public returns (bool success);
  function transferFrom(address from, address to, uint tokens) public returns (bool success);

  event Transfer(address indexed from, address indexed to, uint tokens);
  event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
}

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[{"constant":true,"inputs":[{"name":"value","type":"uint256"},{"name":"gasPrice","type":"uint256"},{"name":"expiration","type":"uint256"},{"name":"payload","type":"bytes32"},{"name":"hash","type":"bytes32"},{"name":"v","type":"uint8"},{"name":"r","type":"bytes32"},{"name":"s","type":"bytes32"},{"name":"tokenContract","type":"address"}],"name":"validatePayment","outputs":[{"name":"valid","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"tokenContract","type":"address"}],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newQuoteSigner","type":"address"}],"name":"setSigner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newAdmin","type":"address"}],"name":"setAdmin","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"value","type":"uint256"},{"name":"gasPrice","type":"uint256"},{"name":"expiration","type":"uint256"},{"name":"payload","type":"bytes32"},{"name":"hash","type":"bytes32"},{"name":"v","type":"uint8"},{"name":"r","type":"bytes32"},{"name":"s","type":"bytes32"},{"name":"tokenContract","type":"address"}],"name":"isValidPayment","outputs":[{"name":"valid","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"value","type":"uint256"},{"name":"gasPrice","type":"uint256"},{"name":"expiration","type":"uint256"},{"name":"payload","type":"bytes32"},{"name":"hash","type":"bytes32"},{"name":"v","type":"uint8"},{"name":"r","type":"bytes32"},{"name":"s","type":"bytes32"},{"name":"tokenContract","type":"address"}],"name":"pay","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[],"name":"quoteSigner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"isPaid","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[{"name":"valueSigner","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"hash","type":"bytes32"},{"indexed":true,"name":"tokenContract","type":"address"},{"indexed":false,"name":"time","type":"uint256"},{"indexed":false,"name":"value","type":"uint256"}],"name":"PaymentAccepted","type":"event"}]

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00000000000000000000000024d440f3c4213dc7804ae4b1ca64f6bf4b924630

-----Decoded View---------------
Arg [0] : valueSigner (address): 0x24d440f3C4213Dc7804AE4B1ca64f6bf4B924630

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000024d440f3c4213dc7804ae4b1ca64f6bf4b924630

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bzzr://0553365c18038995e59b12db65d2788962a98812f4b6b7855cb4febc51731535