{
  "contractName": "XBRPaymentChannel",
  "abi": [
    {
      "inputs": [
        {
          "name": "marketId",
          "type": "bytes16"
        },
        {
          "name": "sender",
          "type": "address"
        },
        {
          "name": "delegate",
          "type": "address"
        },
        {
          "name": "recipient",
          "type": "address"
        },
        {
          "name": "amount",
          "type": "uint256"
        },
        {
          "name": "channelTimeout",
          "type": "uint32"
        }
      ],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "constructor"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": true,
          "name": "marketId",
          "type": "bytes16"
        },
        {
          "indexed": false,
          "name": "signer",
          "type": "address"
        },
        {
          "indexed": false,
          "name": "amount",
          "type": "uint256"
        },
        {
          "indexed": false,
          "name": "timeoutAt",
          "type": "uint256"
        }
      ],
      "name": "Closing",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": true,
          "name": "marketId",
          "type": "bytes16"
        },
        {
          "indexed": false,
          "name": "signer",
          "type": "address"
        },
        {
          "indexed": false,
          "name": "amount",
          "type": "uint256"
        },
        {
          "indexed": false,
          "name": "closedAt",
          "type": "uint256"
        }
      ],
      "name": "Closed",
      "type": "event"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "marketId",
      "outputs": [
        {
          "name": "",
          "type": "bytes16"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "sender",
      "outputs": [
        {
          "name": "",
          "type": "address"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "delegate",
      "outputs": [
        {
          "name": "",
          "type": "address"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "recipient",
      "outputs": [
        {
          "name": "",
          "type": "address"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "amount",
      "outputs": [
        {
          "name": "",
          "type": "uint256"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "openedAt",
      "outputs": [
        {
          "name": "",
          "type": "uint256"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "closedAt",
      "outputs": [
        {
          "name": "",
          "type": "uint256"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "channelTimeout",
      "outputs": [
        {
          "name": "",
          "type": "uint32"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "h",
          "type": "bytes32"
        },
        {
          "name": "v",
          "type": "uint8"
        },
        {
          "name": "r",
          "type": "bytes32"
        },
        {
          "name": "s",
          "type": "bytes32"
        },
        {
          "name": "sequence",
          "type": "uint32"
        },
        {
          "name": "value",
          "type": "uint256"
        }
      ],
      "name": "close",
      "outputs": [],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [],
      "name": "timeout",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    }
  ],
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  "source": "///////////////////////////////////////////////////////////////////////////////\n//\n//  Copyright (C) 2018 Crossbar.io Technologies GmbH and contributors.\n//\n//  Licensed under the Apache License, Version 2.0 (the \"License\");\n//  you may not use this file except in compliance with the License.\n//  You may obtain a copy of the License at\n//\n//      http://www.apache.org/licenses/LICENSE-2.0\n//\n//  Unless required by applicable law or agreed to in writing, software\n//  distributed under the License is distributed on an \"AS IS\" BASIS,\n//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n//  See the License for the specific language governing permissions and\n//  limitations under the License.\n//\n///////////////////////////////////////////////////////////////////////////////\n\npragma solidity ^0.5.2;\n\n// https://openzeppelin.org/api/docs/math_SafeMath.html\nimport \"openzeppelin-solidity/contracts/math/SafeMath.sol\";\n\n// https://openzeppelin.org/api/docs/cryptography_ECDSA.html\nimport \"openzeppelin-solidity/contracts/cryptography/ECDSA.sol\";\n\n\n/**\n * XBR Payment Channel between a XBR data consumer and the XBR market maker,\n * or the XBR Market Maker and a XBR data provider.\n */\ncontract XBRPaymentChannel {\n\n    // Add safe math functions to uint256 using SafeMath lib from OpenZeppelin\n    using SafeMath for uint256;\n\n    // Add recover method for bytes32 using ECDSA lib from OpenZeppelin\n    using ECDSA for bytes32;\n\n    /// Payment channel states.\n    enum ChannelState { NONE, OPEN, CLOSING, CLOSED }\n\n    /// Current payment channel state.\n    ChannelState private state;\n\n    /// The XBR Market ID this channel is operating payments for.\n    bytes16 private _marketId;\n\n    /// The sender of the payments in this channel. Either a XBR Consumer or XBR Market Maker (delegate).\n    address private _sender;\n\n    /**\n     * The delegate working for the sender, and using this channel to pay for data keys.\n     * E.g. a XBR Consumer (delegate) or XBR Provider (delegate).\n     */\n    address private _delegate;\n\n    /// Recipient of the payments in this channel. Either a XBR Market Maker (delegate) or a XBR Provider.\n    address private _recipient;\n\n    /// Amount of XBR held in the channel.\n    uint256 private _amount;\n\n    /// Block number when the channel was created.\n    uint256 private _openedAt;\n\n    /// Block number when the channel was closed (finally, after the timeout).\n    uint256 private _closedAt;\n\n    /**\n     * Timeout with which the channel will be closed (the grace period during which the\n     * channel will wait for participants to submit their last signed transaction).\n     */\n    uint32 private _channelTimeout;\n\n    /// Signatures of the channel participants (when channel is closing).\n    mapping (bytes32 => address) private _signatures;\n\n    /**\n     * Event emitted when payment channel is closing (that is, one of the two state channel\n     * participants has called \"close()\", initiating start of the channel timeout).\n     */\n    event Closing(bytes16 indexed marketId, address signer, uint256 amount, uint256 timeoutAt);\n\n    /**\n     * Event emitted when payment channel has finally closed, which happens after both state\n     * channel participants have called close(), agreeing on last state, or after the timeout\n     * at latest - in case the second participant doesn't react within timeout)\n     */\n    event Closed(bytes16 indexed marketId, address signer, uint256 amount, uint256 closedAt);\n\n    /**\n     * Create a new XBR payment channel for handling microtransactions of XBR tokens.\n     *\n     * @param marketId The ID of the XBR market this payment channel is associated with.\n     * @param sender The sender (onchain) of the payments.\n     * @param delegate The offchain delegate allowed to spend XBR offchain, from the channel,\n     *     in the name of the original sender.\n     * @param recipient The receiver (onchain) of the payments.\n     * @param amount The amount of XBR held in the channel.\n     * @param channelTimeout The payment channel timeout period that begins with the first call to `close()`\n     */\n    constructor (bytes16 marketId, address sender, address delegate, address recipient, uint256 amount,\n        uint32 channelTimeout) public {\n\n        _marketId = marketId;\n        _sender = sender;\n        _delegate = delegate;\n        _recipient = recipient;\n        _amount = amount;\n        _channelTimeout = channelTimeout;\n\n        _openedAt = block.number; // solhint-disable-line\n    }\n\n    /**\n     * The XBR Market ID this channel is operating payments for.\n     */\n    function marketId () public view returns (bytes16) {\n        return _marketId;\n    }\n\n    /**\n     * The sender of the payments in this channel. Either a XBR Consumer or XBR Market Maker (delegate).\n     */\n    function sender () public view returns (address) {\n        return _sender;\n    }\n\n    /**\n     * The delegate working for the sender, and using this channel to pay for data keys. E.g. a\n     * XBR Consumer (delegate) or XBR Provider (delegate).\n     */\n    function delegate () public view returns (address) {\n        return _delegate;\n    }\n\n    /**\n     * Recipient of the payments in this channel. Either a XBR Market Maker (delegate) or a XBR Provider.\n     */\n    function recipient () public view returns (address) {\n        return _recipient;\n    }\n\n    /**\n     * Amount of XBR held in the channel.\n     */\n    function amount () public view returns (uint256) {\n        return _amount;\n    }\n\n    /**\n     * Block number when the channel was created.\n     */\n    function openedAt () public view returns (uint256) {\n        return _openedAt;\n    }\n\n    /**\n     * Block number when the channel was closed (finally, after the timeout).\n     */\n    function closedAt () public view returns (uint256) {\n        return _closedAt;\n    }\n\n    /**\n     * Timeout with which the channel will be closed (the grace period during which the\n     * channel will wait for participants to submit their last signed transaction).\n     */\n    function channelTimeout () public view returns (uint32) {\n        return _channelTimeout;\n    }\n\n    /**\n     * Trigger closing this payment channel. When the first participant has called `close()`\n     * submitting its latest transaction/state, a timeout period begins during which the\n     * other party of the payment channel has to submit its latest transaction/state too.\n     * When both transaction have been submitted, and the submitted transactions/states agree,\n     * the channel immediately closes, and the consumed amount of token in the channel is\n     * transferred to the channel recipient, and the remaining amount of token is transferred\n     * back to the original sender.\n     */\n    function close (bytes32 h, uint8 v, bytes32 r, bytes32 s, uint32 sequence, uint256 value) public view {\n\n        address signer;\n        bytes32 proof;\n\n        // get signer from signature\n        signer = ecrecover(h, v, r, s);\n\n        if (signer != _sender && signer != _recipient) {\n            revert(\"invalid signature\");\n        }\n\n        proof = keccak256(abi.encodePacked(this, sequence, value));\n\n        if (proof != h) {\n            revert(\"invalid signature (signature is valid but doesn't match the data provided)\");\n        }\n/* FIXME\n        if (_signatures[proof] == 0) {\n            _signatures[proof] = signer;\n\n            // event Closing(bytes16 indexed marketId, address signer, uint256 amount, uint256 timeoutAt);\n            emit Closing(_marketId, signer, value, block.number + _channelTimeout);\n\n        } else if (_signatures[proof] != signer) {\n            // channel completed, both _signatures provided\n            _closedAt = block.number;\n            if (!_recipient.send(value)) { // solhint-disable-line\n                revert(\"transaction failed on the very last meter\");\n            }\n\n            // refund back anything left to the original opener of the payment channel\n            selfdestruct(_sender);\n\n            // event Closed(bytes16 indexed marketId, address signer, uint256 amount, uint256 closedAt);\n            emit Closed(_marketId, signer, value, _closedAt);\n        }\n*/\n    }\n\n    /**\n     * Timeout this state channel.\n     */\n    function timeout () public {\n        require(_closedAt == 0, \"CHANNEL_ALREADY_CLOSED\");\n        // require(_signatures[proof] != 0, \"CHANNEL_NOT_YET_SIGNED\");\n\n        if (_openedAt + _channelTimeout > now) { // solhint-disable-line\n            revert(\"channel timeout\");\n        }\n        _closedAt = block.number;\n\n        // FIXME\n        // selfdestruct(_sender);\n        // emit Closed();\n    }\n\n    function _verify (bytes32 hash, uint8 v, bytes16 r, bytes32 s, address expectedSigner) internal pure returns (bool)\n    {\n        bytes memory prefix = \"\\x19Ethereum Signed Message:\\n32\";\n        bytes32 prefixedHash = keccak256(abi.encodePacked(prefix, hash));\n        return ecrecover(prefixedHash, v, r, s) == expectedSigner;\n    }\n}\n",
  "sourcePath": "/home/oberstet/scm/xbr/xbr-protocol/contracts/XBRPaymentChannel.sol",
  "ast": {
    "absolutePath": "/home/oberstet/scm/xbr/xbr-protocol/contracts/XBRPaymentChannel.sol",
    "exportedSymbols": {
      "XBRPaymentChannel": [
        2428
      ]
    },
    "id": 2429,
    "nodeType": "SourceUnit",
    "nodes": [
      {
        "id": 2133,
        "literals": [
          "solidity",
          "^",
          "0.5",
          ".2"
        ],
        "nodeType": "PragmaDirective",
        "src": "805:23:4"
      },
      {
        "absolutePath": "openzeppelin-solidity/contracts/math/SafeMath.sol",
        "file": "openzeppelin-solidity/contracts/math/SafeMath.sol",
        "id": 2134,
        "nodeType": "ImportDirective",
        "scope": 2429,
        "sourceUnit": 2765,
        "src": "886:59:4",
        "symbolAliases": [],
        "unitAlias": ""
      },
      {
        "absolutePath": "openzeppelin-solidity/contracts/cryptography/ECDSA.sol",
        "file": "openzeppelin-solidity/contracts/cryptography/ECDSA.sol",
        "id": 2135,
        "nodeType": "ImportDirective",
        "scope": 2429,
        "sourceUnit": 2637,
        "src": "1008:64:4",
        "symbolAliases": [],
        "unitAlias": ""
      },
      {
        "baseContracts": [],
        "contractDependencies": [],
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                          {
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                    "nodeType": "BinaryOperation",
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                    "rightExpression": {
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                      "id": 2423,
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                    },
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            },
            "documentation": null,
            "id": 2427,
            "implemented": true,
            "kind": "function",
            "modifiers": [],
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              "nodeType": "ParameterList",
              "parameters": [
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                {
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            },
            "scope": 2428,
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        ],
        "scope": 2429,
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    ],
    "src": "805:8168:4"
  },
  "compiler": {
    "name": "solc",
    "version": "0.5.2+commit.1df8f40c.Emscripten.clang"
  },
  "networks": {},
  "schemaVersion": "3.0.5",
  "updatedAt": "2019-06-04T10:01:11.429Z",
  "devdoc": {
    "methods": {
      "constructor": {
        "params": {
          "amount": "The amount of XBR held in the channel.",
          "channelTimeout": "The payment channel timeout period that begins with the first call to `close()`",
          "delegate": "The offchain delegate allowed to spend XBR offchain, from the channel,    in the name of the original sender.",
          "marketId": "The ID of the XBR market this payment channel is associated with.",
          "recipient": "The receiver (onchain) of the payments.",
          "sender": "The sender (onchain) of the payments."
        }
      }
    }
  },
  "userdoc": {
    "methods": {
      "amount()": {
        "notice": "Amount of XBR held in the channel."
      },
      "channelTimeout()": {
        "notice": "Timeout with which the channel will be closed (the grace period during which the channel will wait for participants to submit their last signed transaction)."
      },
      "close(bytes32,uint8,bytes32,bytes32,uint32,uint256)": {
        "notice": "Trigger closing this payment channel. When the first participant has called `close()` submitting its latest transaction/state, a timeout period begins during which the other party of the payment channel has to submit its latest transaction/state too. When both transaction have been submitted, and the submitted transactions/states agree, the channel immediately closes, and the consumed amount of token in the channel is transferred to the channel recipient, and the remaining amount of token is transferred back to the original sender."
      },
      "closedAt()": {
        "notice": "Block number when the channel was closed (finally, after the timeout)."
      },
      "constructor": "Create a new XBR payment channel for handling microtransactions of XBR tokens.",
      "delegate()": {
        "notice": "The delegate working for the sender, and using this channel to pay for data keys. E.g. a XBR Consumer (delegate) or XBR Provider (delegate)."
      },
      "marketId()": {
        "notice": "The XBR Market ID this channel is operating payments for."
      },
      "openedAt()": {
        "notice": "Block number when the channel was created."
      },
      "recipient()": {
        "notice": "Recipient of the payments in this channel. Either a XBR Market Maker (delegate) or a XBR Provider."
      },
      "sender()": {
        "notice": "The sender of the payments in this channel. Either a XBR Consumer or XBR Market Maker (delegate)."
      },
      "timeout()": {
        "notice": "Timeout this state channel."
      }
    },
    "notice": "XBR Payment Channel between a XBR data consumer and the XBR market maker, or the XBR Market Maker and a XBR data provider."
  }
}