@alayanetwork/ethjs-ens/example/bundle.js

An ENS interface module built on EthJS.

(function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
module.exports=[
  {
    "constant": true,
    "inputs": [
      {
        "name": "node",
        "type": "bytes32"
      }
    ],
    "name": "resolver",
    "outputs": [
      {
        "name": "",
        "type": "address"
      }
    ],
    "type": "function"
  },
  {
    "constant": true,
    "inputs": [
      {
        "name": "node",
        "type": "bytes32"
      }
    ],
    "name": "owner",
    "outputs": [
      {
        "name": "",
        "type": "address"
      }
    ],
    "type": "function"
  },
  {
    "constant": false,
    "inputs": [
      {
        "name": "node",
        "type": "bytes32"
      },
      {
        "name": "resolver",
        "type": "address"
      }
    ],
    "name": "setResolver",
    "outputs": [],
    "type": "function"
  },
  {
    "constant": false,
    "inputs": [
      {
        "name": "node",
        "type": "bytes32"
      },
      {
        "name": "label",
        "type": "bytes32"
      },
      {
        "name": "owner",
        "type": "address"
      }
    ],
    "name": "setSubnodeOwner",
    "outputs": [],
    "type": "function"
  },
  {
    "constant": false,
    "inputs": [
      {
        "name": "node",
        "type": "bytes32"
      },
      {
        "name": "owner",
        "type": "address"
      }
    ],
    "name": "setOwner",
    "outputs": [],
    "type": "function"
  }
]
},{}],2:[function(require,module,exports){
module.exports=[
  {
    "constant": true,
    "inputs": [
      {
        "name": "node",
        "type": "bytes32"
      }
    ],
    "name": "addr",
    "outputs": [
      {
        "name": "",
        "type": "address"
      }
    ],
    "type": "function"
  },
  {
    "constant": true,
    "inputs": [
      {
        "name": "node",
        "type": "bytes32"
      }
    ],
    "name": "content",
    "outputs": [
      {
        "name": "",
        "type": "bytes32"
      }
    ],
    "type": "function"
  },
  {
    "constant": true,
    "inputs": [
      {
        "name": "node",
        "type": "bytes32"
      }
    ],
    "name": "name",
    "outputs": [
      {
        "name": "",
        "type": "string"
      }
    ],
    "type": "function"
  },
  {
    "constant": true,
    "inputs": [
      {
        "name": "node",
        "type": "bytes32"
      },
      {
        "name": "kind",
        "type": "bytes32"
      }
    ],
    "name": "has",
    "outputs": [
      {
        "name": "",
        "type": "bool"
      }
    ],
    "type": "function"
  },
  {
    "constant": false,
    "inputs": [
      {
        "name": "node",
        "type": "bytes32"
      },
      {
        "name": "addr",
        "type": "address"
      }
    ],
    "name": "setAddr",
    "outputs": [],
    "type": "function"
  },
  {
    "constant": false,
    "inputs": [
      {
        "name": "node",
        "type": "bytes32"
      },
      {
        "name": "hash",
        "type": "bytes32"
      }
    ],
    "name": "setContent",
    "outputs": [],
    "type": "function"
  },
  {
    "constant": false,
    "inputs": [
      {
        "name": "node",
        "type": "bytes32"
      },
      {
        "name": "name",
        "type": "string"
      }
    ],
    "name": "setName",
    "outputs": [],
    "type": "function"
  },
  {
    "constant": true,
    "inputs": [
      {
        "name": "node",
        "type": "bytes32"
      },
      {
        "name": "contentType",
        "type": "uint256"
      }
    ],
    "name": "ABI",
    "outputs": [
      {
        "name": "",
        "type": "uint256"
      },
      {
        "name": "",
        "type": "bytes"
      }
    ],
    "payable": false,
    "type": "function"
  }
]
},{}],3:[function(require,module,exports){
const ENS = require('../')
const HttpProvider = require('ethjs-provider-http')
const networkMap = require('../lib/network-map.json')
let ens

// For MetaMask or Mist compatibility:
window.addEventListener('load', function() {

  if (typeof window.web3 !== 'undefined') {
    console.log('web3 browser detected, using.')
    web3.version.getNetwork(function (err, network) {
      if (err) {
        return resultField.innerText = 'There was a problem: ' + err.message
      }
      ens = new ENS({ provider: web3.currentProvider, network: network })
    })
  } else {
    console.log('no web3 browser detected, using infura.')
    const provider = new HttpProvider('https://mainnet.infura.io')
    ens = new ENS({ provider, network: '1' })
  }

})

searchButton.addEventListener('click', function() {
  console.log('clicked button.')
  var query = lookupField.value
  console.log('querying for ' + query)
  ens.lookup(query)
  .then((address) => {
    console.log('ens returned ' + address)
    resultField.innerText = address
  })
  .catch((reason) => {
    console.log('ens failed!')
    console.error(reason)
    resultField.innerText = 'There was a problem: ' + reason.message
  })

})

},{"../":4,"../lib/network-map.json":5,"ethjs-provider-http":131}],4:[function(require,module,exports){
// External Deps
const Eth = require('@alayanetwork/ethjs-query')
const EthContract = require('@alayanetwork/ethjs-contract')
const namehash = require('eth-ens-namehash')

// ABIs
const registryAbi = require('./abis/registry.json')
const resolverAbi = require('./abis/resolver.json')

// Map network to known ENS registries
const networkMap = require('ethereum-ens-network-map')
const emptyHash = '0x0000000000000000000000000000000000000000000000000000000000000000'
const emptyAddr = '0x0000000000000000000000000000000000000000'

const NotFoundError = new Error('ENS name not defined.')
const BadCharacterError = new Error('Illegal Character for ENS.')

class Ens {
  constructor (opts = {}) {
    const { provider, network } = opts
    let { registryAddress } = opts

    // Validations
    if (!provider) {
      throw new Error('The EthJsENS Constructor requires a provider.')
    }

    // Requires EITHER a network or a registryAddress
    if (!network && !registryAddress) {
      throw new Error('The EthJsENS Constructor requires a network or registry address.')
    }

    this.provider = provider
    this.eth = new Eth(this.provider)
    this.contract = new EthContract(this.eth)
    this.namehash = namehash

    // Link to Registry
    this.Registry = this.contract(registryAbi)
    if (!registryAddress && network) {
      registryAddress = networkMap[network]
    }
    this.registry = this.Registry.at(registryAddress)

    // Create Resolver class
    this.Resolver = this.contract(resolverAbi)
  }

  lookup (name = '') {
    return this.getNamehash(name)
      .then((node) => {
        if (node === emptyHash) {
          return Promise.reject(NotFoundError)
        }
        return this.resolveAddressForNode(node)
      })
  }

  getNamehash (name) {
    try {
      return Promise.resolve(namehash(name))
    } catch (e) {
      return Promise.reject(BadCharacterError)
    }
  }

  getOwner (name = '') {
    return this.getNamehash(name)
      .then(node => this.getOwnerForNode(node))
  }

  getOwnerForNode (node) {
    if (node === emptyHash) {
      return Promise.reject(NotFoundError)
    }
    return this.registry.owner(node)
      .then((result) => {
        const ownerAddress = result[0]
        if (ownerAddress === emptyAddr) {
          throw NotFoundError
        }

        return ownerAddress
      })
  }

  getResolver (name = '') {
    return this.getNamehash(name)
      .then(node => this.getResolverForNode(node))
  }

  getResolverAddress (name = '') {
    return this.getNamehash(name)
      .then(node => this.getResolverAddressForNode(node))
  }

  getResolverForNode (node) {
    if (!node.startsWith('0x')) {
      node = `0x${node}`
    }

    return this.getResolverAddressForNode(node)
      .then((resolverAddress) => {
        return this.Resolver.at(resolverAddress)
      })
  }

  getResolverAddressForNode (node) {
    return this.registry.resolver(node)
      .then((result) => {
        const resolverAddress = result[0]
        if (resolverAddress === emptyAddr) {
          throw NotFoundError
        }
        return resolverAddress
      })
  }

  resolveAddressForNode (node) {
    return this.getResolverForNode(node)
      .then((resolver) => {
        return resolver.addr(node)
      })
      .then(result => result[0])
  }

  reverse (address) {
    if (!address) {
      return Promise.reject(new Error('Must supply an address to reverse lookup.'))
    }

    if (address.startsWith('0x')) {
      address = address.slice(2)
    }

    const name = `${address.toLowerCase()}.addr.reverse`
    const node = namehash(name)
    return this.getNamehash(name)
      .then(node => this.getResolverForNode(node))
      .then(resolver => resolver.name(node))
      .then(results => results[0])
  }
}

module.exports = Ens

},{"./abis/registry.json":1,"./abis/resolver.json":2,"@alayanetwork/ethjs-contract":14,"@alayanetwork/ethjs-query":19,"eth-ens-namehash":127,"ethereum-ens-network-map":129}],5:[function(require,module,exports){
module.exports={
  "1": {
    "registry": "314159265dd8dbb310642f98f50c066173c1259b"
  },
  "3": {
    "registry": "112234455c3a32fd11230c42e7bccd4a84e02010",
    "resolver": "C68De5B43C3d980B0C110A77a5F78d3c4c4d63B4"
  }
}

},{}],6:[function(require,module,exports){
'use strict';

// Copyright (c) 2017 Pieter Wuille
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

var CHARSET = 'qpzry9x8gf2tvdw0s3jn54khce6mua7l';
var GENERATOR = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3];

module.exports = {
  decode: decode,
  encode: encode
};

function polymod(values) {
  var chk = 1;
  for (var p = 0; p < values.length; ++p) {
    var top = chk >> 25;
    chk = (chk & 0x1ffffff) << 5 ^ values[p];
    for (var i = 0; i < 5; ++i) {
      if (top >> i & 1) {
        chk ^= GENERATOR[i];
      }
    }
  }
  return chk;
}

function hrpExpand(hrp) {
  var ret = [];
  var p;
  for (p = 0; p < hrp.length; ++p) {
    ret.push(hrp.charCodeAt(p) >> 5);
  }
  ret.push(0);
  for (p = 0; p < hrp.length; ++p) {
    ret.push(hrp.charCodeAt(p) & 31);
  }
  return ret;
}

function verifyChecksum(hrp, data) {
  return polymod(hrpExpand(hrp).concat(data)) === 1;
}

function createChecksum(hrp, data) {
  var values = hrpExpand(hrp).concat(data).concat([0, 0, 0, 0, 0, 0]);
  var mod = polymod(values) ^ 1;
  var ret = [];
  for (var p = 0; p < 6; ++p) {
    ret.push(mod >> 5 * (5 - p) & 31);
  }
  return ret;
}

function encode(hrp, data) {
  var combined = data.concat(createChecksum(hrp, data));
  var ret = hrp + '1';
  for (var p = 0; p < combined.length; ++p) {
    ret += CHARSET.charAt(combined[p]);
  }
  return ret;
}

function decode(bechString) {
  var p;
  var hasLower = false;
  var hasUpper = false;
  for (p = 0; p < bechString.length; ++p) {
    if (bechString.charCodeAt(p) < 33 || bechString.charCodeAt(p) > 126) {
      return null;
    }
    if (bechString.charCodeAt(p) >= 97 && bechString.charCodeAt(p) <= 122) {
      hasLower = true;
    }
    if (bechString.charCodeAt(p) >= 65 && bechString.charCodeAt(p) <= 90) {
      hasUpper = true;
    }
  }
  if (hasLower && hasUpper) {
    return null;
  }
  bechString = bechString.toLowerCase();
  var pos = bechString.lastIndexOf('1');
  if (pos < 1 || pos + 7 > bechString.length || bechString.length > 90) {
    return null;
  }
  var hrp = bechString.substring(0, pos);
  var data = [];
  for (p = pos + 1; p < bechString.length; ++p) {
    var d = CHARSET.indexOf(bechString.charAt(p));
    if (d === -1) {
      return null;
    }
    data.push(d);
  }
  if (!verifyChecksum(hrp, data)) {
    return null;
  }
  return { hrp: hrp, data: data.slice(0, data.length - 6) };
}
},{}],7:[function(require,module,exports){
'use strict';

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

var createKeccakHash = require('keccak');
var secp256k1 = require('secp256k1');
var assert = require('assert');
var rlp = require('rlp');
var BN = require('bn.js');
var segwitAddr = require('./segwit_addr');
var createHash = require('create-hash');
var Buffer = require('safe-buffer').Buffer;
Object.assign(exports, require('ethjs-util'));

/**
 * the max integer that this VM can handle (a ```BN```)
 * @var {BN} MAX_INTEGER
 */
exports.MAX_INTEGER = new BN('ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', 16);

/**
 * 2^256 (a ```BN```)
 * @var {BN} TWO_POW256
 */
exports.TWO_POW256 = new BN('10000000000000000000000000000000000000000000000000000000000000000', 16);

/**
 * Keccak-256 hash of null (a ```String```)
 * @var {String} KECCAK256_NULL_S
 */
exports.KECCAK256_NULL_S = 'c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470';
exports.SHA3_NULL_S = exports.KECCAK256_NULL_S;

/**
 * Keccak-256 hash of null (a ```Buffer```)
 * @var {Buffer} KECCAK256_NULL
 */
exports.KECCAK256_NULL = Buffer.from(exports.KECCAK256_NULL_S, 'hex');
exports.SHA3_NULL = exports.KECCAK256_NULL;

/**
 * Keccak-256 of an RLP of an empty array (a ```String```)
 * @var {String} KECCAK256_RLP_ARRAY_S
 */
exports.KECCAK256_RLP_ARRAY_S = '1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347';
exports.SHA3_RLP_ARRAY_S = exports.KECCAK256_RLP_ARRAY_S;

/**
 * Keccak-256 of an RLP of an empty array (a ```Buffer```)
 * @var {Buffer} KECCAK256_RLP_ARRAY
 */
exports.KECCAK256_RLP_ARRAY = Buffer.from(exports.KECCAK256_RLP_ARRAY_S, 'hex');
exports.SHA3_RLP_ARRAY = exports.KECCAK256_RLP_ARRAY;

/**
 * Keccak-256 hash of the RLP of null  (a ```String```)
 * @var {String} KECCAK256_RLP_S
 */
exports.KECCAK256_RLP_S = '56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421';
exports.SHA3_RLP_S = exports.KECCAK256_RLP_S;

/**
 * Keccak-256 hash of the RLP of null (a ```Buffer```)
 * @var {Buffer} KECCAK256_RLP
 */
exports.KECCAK256_RLP = Buffer.from(exports.KECCAK256_RLP_S, 'hex');
exports.SHA3_RLP = exports.KECCAK256_RLP;

/**
 * [`BN`](https://github.com/indutny/bn.js)
 * @var {Function}
 */
exports.BN = BN;

/**
 * [`rlp`](https://github.com/ethereumjs/rlp)
 * @var {Function}
 */
exports.rlp = rlp;

/**
 * [`secp256k1`](https://github.com/cryptocoinjs/secp256k1-node/)
 * @var {Object}
 */
exports.secp256k1 = secp256k1;

/**
 * Returns a buffer filled with 0s
 * @method zeros
 * @param {Number} bytes  the number of bytes the buffer should be
 * @return {Buffer}
 */
exports.zeros = function (bytes) {
  return Buffer.allocUnsafe(bytes).fill(0);
};

/**
  * Returns a zero address
  * @method zeroAddress
  * @return {String}
  */
exports.zeroAddress = function () {
  var addressLength = 20;
  var zeroAddress = exports.zeros(addressLength);
  return exports.bufferToHex(zeroAddress);
};

/**
 * Left Pads an `Array` or `Buffer` with leading zeros till it has `length` bytes.
 * Or it truncates the beginning if it exceeds.
 * @method lsetLength
 * @param {Buffer|Array} msg the value to pad
 * @param {Number} length the number of bytes the output should be
 * @param {Boolean} [right=false] whether to start padding form the left or right
 * @return {Buffer|Array}
 */
exports.setLengthLeft = exports.setLength = function (msg, length, right) {
  var buf = exports.zeros(length);
  msg = exports.toBuffer(msg);
  if (right) {
    if (msg.length < length) {
      msg.copy(buf);
      return buf;
    }
    return msg.slice(0, length);
  } else {
    if (msg.length < length) {
      msg.copy(buf, length - msg.length);
      return buf;
    }
    return msg.slice(-length);
  }
};

/**
 * Right Pads an `Array` or `Buffer` with leading zeros till it has `length` bytes.
 * Or it truncates the beginning if it exceeds.
 * @param {Buffer|Array} msg the value to pad
 * @param {Number} length the number of bytes the output should be
 * @return {Buffer|Array}
 */
exports.setLengthRight = function (msg, length) {
  return exports.setLength(msg, length, true);
};

/**
 * Trims leading zeros from a `Buffer` or an `Array`
 * @param {Buffer|Array|String} a
 * @return {Buffer|Array|String}
 */
exports.unpad = exports.stripZeros = function (a) {
  a = exports.stripHexPrefix(a);
  var first = a[0];
  while (a.length > 0 && first.toString() === '0') {
    a = a.slice(1);
    first = a[0];
  }
  return a;
};
/**
 * Attempts to turn a value into a `Buffer`. As input it supports `Buffer`, `String`, `Number`, null/undefined, `BN` and other objects with a `toArray()` method.
 * @param {*} v the value
 */
exports.toBuffer = function (v) {
  if (!Buffer.isBuffer(v)) {
    if (Array.isArray(v)) {
      v = Buffer.from(v);
    } else if (typeof v === 'string') {
      if (exports.isHexString(v)) {
        v = Buffer.from(exports.padToEven(exports.stripHexPrefix(v)), 'hex');
      } else {
        v = Buffer.from(v);
      }
    } else if (typeof v === 'number') {
      v = exports.intToBuffer(v);
    } else if (v === null || v === undefined) {
      v = Buffer.allocUnsafe(0);
    } else if (BN.isBN(v)) {
      v = v.toArrayLike(Buffer);
    } else if (v.toArray) {
      // converts a BN to a Buffer
      v = Buffer.from(v.toArray());
    } else {
      throw new Error('invalid type');
    }
  }
  return v;
};

/**
 * Converts a `Buffer` to a `Number`
 * @param {Buffer} buf
 * @return {Number}
 * @throws If the input number exceeds 53 bits.
 */
exports.bufferToInt = function (buf) {
  return new BN(exports.toBuffer(buf)).toNumber();
};

/**
 * Converts a `Buffer` into a hex `String`
 * @param {Buffer} buf
 * @return {String}
 */
exports.bufferToHex = function (buf) {
  buf = exports.toBuffer(buf);
  return '0x' + buf.toString('hex');
};

/**
 * Interprets a `Buffer` as a signed integer and returns a `BN`. Assumes 256-bit numbers.
 * @param {Buffer} num
 * @return {BN}
 */
exports.fromSigned = function (num) {
  return new BN(num).fromTwos(256);
};

/**
 * Converts a `BN` to an unsigned integer and returns it as a `Buffer`. Assumes 256-bit numbers.
 * @param {BN} num
 * @return {Buffer}
 */
exports.toUnsigned = function (num) {
  return Buffer.from(num.toTwos(256).toArray());
};

/**
 * Creates Keccak hash of the input
 * @param {Buffer|Array|String|Number} a the input data
 * @param {Number} [bits=256] the Keccak width
 * @return {Buffer}
 */
exports.keccak = function (a, bits) {
  a = exports.toBuffer(a);
  if (!bits) bits = 256;

  return createKeccakHash('keccak' + bits).update(a).digest();
};

/**
 * Creates Keccak-256 hash of the input, alias for keccak(a, 256)
 * @param {Buffer|Array|String|Number} a the input data
 * @return {Buffer}
 */
exports.keccak256 = function (a) {
  return exports.keccak(a);
};

/**
 * Creates SHA-3 (Keccak) hash of the input [OBSOLETE]
 * @param {Buffer|Array|String|Number} a the input data
 * @param {Number} [bits=256] the SHA-3 width
 * @return {Buffer}
 */
exports.sha3 = exports.keccak;

/**
 * Creates SHA256 hash of the input
 * @param {Buffer|Array|String|Number} a the input data
 * @return {Buffer}
 */
exports.sha256 = function (a) {
  a = exports.toBuffer(a);
  return createHash('sha256').update(a).digest();
};

/**
 * Creates RIPEMD160 hash of the input
 * @param {Buffer|Array|String|Number} a the input data
 * @param {Boolean} padded whether it should be padded to 256 bits or not
 * @return {Buffer}
 */
exports.ripemd160 = function (a, padded) {
  a = exports.toBuffer(a);
  var hash = createHash('rmd160').update(a).digest();
  if (padded === true) {
    return exports.setLength(hash, 32);
  } else {
    return hash;
  }
};

/**
 * Creates SHA-3 hash of the RLP encoded version of the input
 * @param {Buffer|Array|String|Number} a the input data
 * @return {Buffer}
 */
exports.rlphash = function (a) {
  return exports.keccak(rlp.encode(a));
};

/**
 * Checks if the private key satisfies the rules of the curve secp256k1.
 * @param {Buffer} privateKey
 * @return {Boolean}
 */
exports.isValidPrivate = function (privateKey) {
  return secp256k1.privateKeyVerify(privateKey);
};

/**
 * Checks if the public key satisfies the rules of the curve secp256k1
 * and the requirements of Ethereum.
 * @param {Buffer} publicKey The two points of an uncompressed key, unless sanitize is enabled
 * @param {Boolean} [sanitize=false] Accept public keys in other formats
 * @return {Boolean}
 */
exports.isValidPublic = function (publicKey, sanitize) {
  if (publicKey.length === 64) {
    // Convert to SEC1 for secp256k1
    return secp256k1.publicKeyVerify(Buffer.concat([Buffer.from([4]), publicKey]));
  }

  if (!sanitize) {
    return false;
  }

  return secp256k1.publicKeyVerify(publicKey);
};

/**
 * Returns the ethereum address of a given public key.
 * Accepts "Ethereum public keys" and SEC1 encoded keys.
 * @param {Buffer} pubKey The two points of an uncompressed key, unless sanitize is enabled
 * @param {Boolean} [sanitize=false] Accept public keys in other formats
 * @return {Buffer}
 */
exports.pubToAddress = exports.publicToAddress = function (pubKey, sanitize) {
  pubKey = exports.toBuffer(pubKey);
  if (sanitize && pubKey.length !== 64) {
    pubKey = secp256k1.publicKeyConvert(pubKey, false).slice(1);
  }
  assert(pubKey.length === 64);
  // Only take the lower 160bits of the hash
  return exports.keccak(pubKey).slice(-20);
};

/**
 * Returns the ethereum public key of a given private key
 * @param {Buffer} privateKey A private key must be 256 bits wide
 * @return {Buffer}
 */
var privateToPublic = exports.privateToPublic = function (privateKey) {
  privateKey = exports.toBuffer(privateKey);
  // skip the type flag and use the X, Y points
  return secp256k1.publicKeyCreate(privateKey, false).slice(1);
};

/**
 * Converts a public key to the Ethereum format.
 * @param {Buffer} publicKey
 * @return {Buffer}
 */
exports.importPublic = function (publicKey) {
  publicKey = exports.toBuffer(publicKey);
  if (publicKey.length !== 64) {
    publicKey = secp256k1.publicKeyConvert(publicKey, false).slice(1);
  }
  return publicKey;
};

/**
 * ECDSA sign
 * @param {Buffer} msgHash
 * @param {Buffer} privateKey
 * @return {Object}
 */
exports.ecsign = function (msgHash, privateKey) {
  var sig = secp256k1.sign(msgHash, privateKey);

  var ret = {};
  ret.r = sig.signature.slice(0, 32);
  ret.s = sig.signature.slice(32, 64);
  ret.v = sig.recovery + 27;
  return ret;
};

/**
 * Returns the keccak-256 hash of `message`, prefixed with the header used by the `eth_sign` RPC call.
 * The output of this function can be fed into `ecsign` to produce the same signature as the `eth_sign`
 * call for a given `message`, or fed to `ecrecover` along with a signature to recover the public key
 * used to produce the signature.
 * @param message
 * @returns {Buffer} hash
 */
exports.hashPersonalMessage = function (message) {
  var prefix = exports.toBuffer('\x19Ethereum Signed Message:\n' + message.length.toString());
  return exports.keccak(Buffer.concat([prefix, message]));
};

/**
 * ECDSA public key recovery from signature
 * @param {Buffer} msgHash
 * @param {Number} v
 * @param {Buffer} r
 * @param {Buffer} s
 * @return {Buffer} publicKey
 */
exports.ecrecover = function (msgHash, v, r, s) {
  var signature = Buffer.concat([exports.setLength(r, 32), exports.setLength(s, 32)], 64);
  var recovery = v - 27;
  if (recovery !== 0 && recovery !== 1) {
    throw new Error('Invalid signature v value');
  }
  var senderPubKey = secp256k1.recover(msgHash, signature, recovery);
  return secp256k1.publicKeyConvert(senderPubKey, false).slice(1);
};

/**
 * Convert signature parameters into the format of `eth_sign` RPC method
 * @param {Number} v
 * @param {Buffer} r
 * @param {Buffer} s
 * @return {String} sig
 */
exports.toRpcSig = function (v, r, s) {
  // NOTE: with potential introduction of chainId this might need to be updated
  if (v !== 27 && v !== 28) {
    throw new Error('Invalid recovery id');
  }

  // geth (and the RPC eth_sign method) uses the 65 byte format used by Bitcoin
  // FIXME: this might change in the future - https://github.com/ethereum/go-ethereum/issues/2053
  return exports.bufferToHex(Buffer.concat([exports.setLengthLeft(r, 32), exports.setLengthLeft(s, 32), exports.toBuffer(v - 27)]));
};

/**
 * Convert signature format of the `eth_sign` RPC method to signature parameters
 * NOTE: all because of a bug in geth: https://github.com/ethereum/go-ethereum/issues/2053
 * @param {String} sig
 * @return {Object}
 */
exports.fromRpcSig = function (sig) {
  sig = exports.toBuffer(sig);

  // NOTE: with potential introduction of chainId this might need to be updated
  if (sig.length !== 65) {
    throw new Error('Invalid signature length');
  }

  var v = sig[64];
  // support both versions of `eth_sign` responses
  if (v < 27) {
    v += 27;
  }

  return {
    v: v,
    r: sig.slice(0, 32),
    s: sig.slice(32, 64)
  };
};

/**
 * Returns the ethereum address of a given private key
 * @param {Buffer} privateKey A private key must be 256 bits wide
 * @return {Buffer}
 */
exports.privateToAddress = function (privateKey) {
  return exports.publicToAddress(privateToPublic(privateKey));
};

/**
 * Checks if the given string is an bech32 address
 *
 * @method isBech32Address
 * @param {String} address the given bech32 adress
 * @return {Boolean}
 */
exports.isBech32Address = function (address) {
  if (address.length !== 42) {
    return false;
  }
  var hrp = address.substr(0, 3);
  var ret = segwitAddr.decode(hrp, address);
  if (ret === null) {
    return false;
  }
  return true;
};

/**
 * Transforms given string to bech32 address
 *
 * @method toBech32Address
 * @param {String} hrp
 * @param {String} address
 * @return {String} formatted bech32 address
 */
exports.toBech32Address = function (hrp, address) {
  if (exports.isValidAddress(address)) {
    return segwitAddr.EncodeAddress(hrp, address);
  }

  return '';
};

/**
 * Resolve the bech32 address
 *
 * @method decodeBech32Address
 * @param {String} bech32Address
 * @return {String} formatted address
 */
exports.decodeBech32Address = function (bech32Address) {
  if (exports.isBech32Address(bech32Address)) {
    var hrp = bech32Address.substr(0, 3);
    var address = segwitAddr.DecodeAddress(hrp, bech32Address);
    if (address !== null) {
      return '0x' + address;
    }
  }
  return '';
};

/**
 * Checks if the address is a valid. Accepts checksummed addresses too
 * @param {String} address
 * @return {Boolean}
 */
exports.isValidAddress = function (address) {
  return (/^0x[0-9a-fA-F]{40}$/.test(address)
  );
};

/**
  * Checks if a given address is a zero address
  * @method isZeroAddress
  * @param {String} address
  * @return {Boolean}
  */
exports.isZeroAddress = function (address) {
  var zeroAddress = exports.zeroAddress();
  return zeroAddress === exports.addHexPrefix(address);
};

/**
 * Returns a checksummed address
 * @param {String} address
 * @return {String}
 */
exports.toChecksumAddress = function (address) {
  address = exports.stripHexPrefix(address).toLowerCase();
  var hash = exports.keccak(address).toString('hex');
  var ret = '0x';

  for (var i = 0; i < address.length; i++) {
    if (parseInt(hash[i], 16) >= 8) {
      ret += address[i].toUpperCase();
    } else {
      ret += address[i];
    }
  }

  return ret;
};

/**
 * Checks if the address is a valid checksummed address
 * @param {Buffer} address
 * @return {Boolean}
 */
exports.isValidChecksumAddress = function (address) {
  return exports.isValidAddress(address) && exports.toChecksumAddress(address) === address;
};

/**
 * Generates an address of a newly created contract
 * @param {Buffer} from the address which is creating this new address
 * @param {Buffer} nonce the nonce of the from account
 * @return {Buffer}
 */
exports.generateAddress = function (from, nonce) {
  from = exports.toBuffer(from);
  nonce = new BN(nonce);

  if (nonce.isZero()) {
    // in RLP we want to encode null in the case of zero nonce
    // read the RLP documentation for an answer if you dare
    nonce = null;
  } else {
    nonce = Buffer.from(nonce.toArray());
  }

  // Only take the lower 160bits of the hash
  return exports.rlphash([from, nonce]).slice(-20);
};

/**
 * Returns true if the supplied address belongs to a precompiled account (Byzantium)
 * @param {Buffer|String} address
 * @return {Boolean}
 */
exports.isPrecompiled = function (address) {
  var a = exports.unpad(address);
  return a.length === 1 && a[0] >= 1 && a[0] <= 8;
};

/**
 * Adds "0x" to a given `String` if it does not already start with "0x"
 * @param {String} str
 * @return {String}
 */
exports.addHexPrefix = function (str) {
  if (typeof str !== 'string') {
    return str;
  }

  if (str.startsWith('atx') || str.startsWith('atp')) {
    return str;
  }

  return exports.isHexPrefixed(str) ? str : '0x' + str;
};

/**
 * Validate ECDSA signature
 * @method isValidSignature
 * @param {Buffer} v
 * @param {Buffer} r
 * @param {Buffer} s
 * @param {Boolean} [homestead=true]
 * @return {Boolean}
 */

exports.isValidSignature = function (v, r, s, homestead) {
  var SECP256K1_N_DIV_2 = new BN('7fffffffffffffffffffffffffffffff5d576e7357a4501ddfe92f46681b20a0', 16);
  var SECP256K1_N = new BN('fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141', 16);

  if (r.length !== 32 || s.length !== 32) {
    return false;
  }

  if (v !== 27 && v !== 28) {
    return false;
  }

  r = new BN(r);
  s = new BN(s);

  if (r.isZero() || r.gt(SECP256K1_N) || s.isZero() || s.gt(SECP256K1_N)) {
    return false;
  }

  if (homestead === false && new BN(s).cmp(SECP256K1_N_DIV_2) === 1) {
    return false;
  }

  return true;
};

/**
 * Converts a `Buffer` or `Array` to JSON
 * @param {Buffer|Array} ba
 * @return {Array|String|null}
 */
exports.baToJSON = function (ba) {
  if (Buffer.isBuffer(ba)) {
    return '0x' + ba.toString('hex');
  } else if (ba instanceof Array) {
    var array = [];
    for (var i = 0; i < ba.length; i++) {
      array.push(exports.baToJSON(ba[i]));
    }
    return array;
  }
};

/**
 * Defines properties on a `Object`. It make the assumption that underlying data is binary.
 * @param {Object} self the `Object` to define properties on
 * @param {Array} fields an array fields to define. Fields can contain:
 * * `name` - the name of the properties
 * * `length` - the number of bytes the field can have
 * * `allowLess` - if the field can be less than the length
 * * `allowEmpty`
 * @param {*} data data to be validated against the definitions
 */
exports.defineProperties = function (self, fields, data) {
  self.raw = [];
  self._fields = [];

  // attach the `toJSON`
  self.toJSON = function (label) {
    if (label) {
      var obj = {};
      self._fields.forEach(function (field) {
        obj[field] = '0x' + self[field].toString('hex');
      });
      return obj;
    }
    return exports.baToJSON(this.raw);
  };

  self.serialize = function serialize() {
    return rlp.encode(self.raw);
  };

  fields.forEach(function (field, i) {
    self._fields.push(field.name);
    function getter() {
      return self.raw[i];
    }
    function setter(v) {
      v = exports.toBuffer(v);

      if (v.toString('hex') === '00' && !field.allowZero) {
        v = Buffer.allocUnsafe(0);
      }

      if (field.allowLess && field.length) {
        v = exports.stripZeros(v);
        assert(field.length >= v.length, 'The field ' + field.name + ' must not have more ' + field.length + ' bytes');
      } else if (!(field.allowZero && v.length === 0) && field.length) {
        assert(field.length === v.length, 'The field ' + field.name + ' must have byte length of ' + field.length);
      }

      self.raw[i] = v;
    }

    Object.defineProperty(self, field.name, {
      enumerable: true,
      configurable: true,
      get: getter,
      set: setter
    });

    if (field.default) {
      self[field.name] = field.default;
    }

    // attach alias
    if (field.alias) {
      Object.defineProperty(self, field.alias, {
        enumerable: false,
        configurable: true,
        set: setter,
        get: getter
      });
    }
  });

  // if the constuctor is passed data
  if (data) {
    if (typeof data === 'string') {
      data = Buffer.from(exports.stripHexPrefix(data), 'hex');
    }

    if (Buffer.isBuffer(data)) {
      data = rlp.decode(data);
    }

    if (Array.isArray(data)) {
      if (data.length > self._fields.length) {
        throw new Error('wrong number of fields in data');
      }

      // make sure all the items are buffers
      data.forEach(function (d, i) {
        self[self._fields[i]] = exports.toBuffer(d);
      });
    } else if ((typeof data === 'undefined' ? 'undefined' : _typeof(data)) === 'object') {
      var keys = Object.keys(data);
      fields.forEach(function (field) {
        if (keys.indexOf(field.name) !== -1) self[field.name] = data[field.name];
        if (keys.indexOf(field.alias) !== -1) self[field.alias] = data[field.alias];
      });
    } else {
      throw new Error('invalid data');
    }
  }
};
},{"./segwit_addr":8,"assert":205,"bn.js":28,"create-hash":110,"ethjs-util":133,"keccak":154,"rlp":184,"safe-buffer":185,"secp256k1":186}],8:[function(require,module,exports){
'use strict';

// Copyright (c) 2017 Pieter Wuille
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

var bech32 = require('./bech32');

module.exports = {
  encode: encode,
  decode: decode,
  DecodeAddress: DecodeAddress,
  EncodeAddress: EncodeAddress
};

function convertbits(data, frombits, tobits, pad) {
  var acc = 0;
  var bits = 0;
  var ret = [];
  var maxv = (1 << tobits) - 1;
  for (var p = 0; p < data.length; ++p) {
    var value = data[p];
    if (value < 0 || value >> frombits !== 0) {
      return null;
    }
    acc = acc << frombits | value;
    bits += frombits;
    while (bits >= tobits) {
      bits -= tobits;
      ret.push(acc >> bits & maxv);
    }
  }
  if (pad) {
    if (bits > 0) {
      ret.push(acc << tobits - bits & maxv);
    }
  } else if (bits >= frombits || acc << tobits - bits & maxv) {
    return null;
  }
  return ret;
}

function decode(hrp, addr) {
  var dec = bech32.decode(addr);
  if (dec === null || dec.hrp !== hrp || dec.data.length < 1 /* || dec.data[0] > 16 */) {
      return null;
    }
  var res = convertbits(dec.data.slice(0), 5, 8, false);
  if (res === null || res.length < 2 || res.length > 40) {
    return null;
  }
  if (dec.data[0] === 0 && res.length !== 20 && res.length !== 32) {
    return null;
  }
  return { hrp: dec.hrp, program: res };
}

function encode(hrp, program) {
  var ret = bech32.encode(hrp, convertbits(program, 8, 5, true));
  if (decode(hrp, ret) === null) {
    return null;
  }
  return ret;
}

// 十六进制字符串转字节数组
function Str2Bytes(str) {
  var pos = 0;
  var len = str.length;
  if (len % 2 !== 0) {
    return null;
  }
  len /= 2;
  var hexA = [];
  for (var i = 0; i < len; i++) {
    var s = str.substr(pos, 2);
    if (s === '0x' || s === '0X') {
      pos += 2;
      continue;
    }
    var v = parseInt(s, 16);
    hexA.push(v);
    pos += 2;
  }
  return hexA;
}

// 字节数组转十六进制字符串
function Bytes2Str(arr) {
  var str = '';
  for (var i = 0; i < arr.length; i++) {
    var tmp = arr[i].toString(16);
    if (tmp.length === 1) {
      tmp = '0' + tmp;
    }
    str += tmp;
  }
  return str;
}

// 解析
function DecodeAddress(hrp, address) {
  var ret = decode(hrp, address);
  if (ret === null) {
    return null;
  }

  return Bytes2Str(ret.program);
  // console.log("decode result ==> " + Bytes2Str(ret.program));
}

//
function EncodeAddress(hrp, strAddress) {
  var program = Str2Bytes(strAddress);
  var ret = encode(hrp, program);
  // console.log("encode result ==> " + ret);
  return ret;
}
},{"./bech32":6}],9:[function(require,module,exports){
(function (Buffer){(function (){
'use strict';

/* eslint-disable */
/*
Primary Attribution
Richard Moore <ricmoo@me.com>
https://github.com/ethers-io

Note, Richard is a god of ether gods. Follow and respect him, and use Ethers.io!
*/

var utils = require('./utils/index.js');
var uint256Coder = utils.uint256Coder;
var ethUtil = require('@alayanetwork/ethereumjs-util');
var coderBoolean = utils.coderBoolean;
var coderFixedBytes = utils.coderFixedBytes;
var coderAddress = utils.coderAddress;
var coderDynamicBytes = utils.coderDynamicBytes;
var coderString = utils.coderString;
var coderArray = utils.coderArray;
var paramTypePart = utils.paramTypePart;
var getParamCoder = utils.getParamCoder;

function Result() {}

function encodeParams(types, values) {
  if (types.length !== values.length) {
    throw new Error('[ethjs-abi] while encoding params, types/values mismatch, Your contract requires ' + types.length + ' types (arguments), and you passed in ' + values.length);
  }

  var parts = [];

  types.forEach(function (type, index) {
    var coder = getParamCoder(type);
    if (type === 'address') {
      values[index] = ethUtil.decodeBech32Address(values[index]);
    }
    parts.push({ dynamic: coder.dynamic, value: coder.encode(values[index]) });
  });

  function alignSize(size) {
    return parseInt(32 * Math.ceil(size / 32));
  }

  var staticSize = 0,
      dynamicSize = 0;
  parts.forEach(function (part) {
    if (part.dynamic) {
      staticSize += 32;
      dynamicSize += alignSize(part.value.length);
    } else {
      staticSize += alignSize(part.value.length);
    }
  });

  var offset = 0,
      dynamicOffset = staticSize;
  var data = new Buffer(staticSize + dynamicSize);

  parts.forEach(function (part, index) {
    if (part.dynamic) {
      uint256Coder.encode(dynamicOffset).copy(data, offset);
      offset += 32;

      part.value.copy(data, dynamicOffset);
      dynamicOffset += alignSize(part.value.length);
    } else {
      part.value.copy(data, offset);
      offset += alignSize(part.value.length);
    }
  });

  return '0x' + data.toString('hex');
}

// decode bytecode data from output names and types
function decodeParams(names, types, data) {
  var useNumberedParams = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : true;

  // Names is optional, so shift over all the parameters if not provided
  if (arguments.length < 3) {
    data = types;
    types = names;
    names = [];
  }

  data = utils.hexOrBuffer(data);
  var values = new Result();

  var offset = 0;
  types.forEach(function (type, index) {
    var coder = getParamCoder(type);

    if (coder.dynamic) {
      var dynamicOffset = uint256Coder.decode(data, offset);
      var result = coder.decode(data, dynamicOffset.value.toNumber());
      offset += dynamicOffset.consumed;
    } else {
      var result = coder.decode(data, offset);
      offset += result.consumed;
    }

    if (useNumberedParams) {
      values[index] = result.value;
    }

    if (names[index]) {
      values[names[index]] = result.value;
    }
  });
  return values;
}

// create an encoded method signature from an ABI object
function encodeSignature(method) {
  var signature = method.name + '(' + utils.getKeys(method.inputs, 'type').join(',') + ')';
  var signatureEncoded = '0x' + new Buffer(utils.keccak256(signature), 'hex').slice(0, 4).toString('hex');

  return signatureEncoded;
}

// encode method ABI object with values in an array, output bytecode
function encodeMethod(method, values) {
  var paramsEncoded = encodeParams(utils.getKeys(method.inputs, 'type'), values).substring(2);

  return '' + encodeSignature(method) + paramsEncoded;
}

// decode method data bytecode, from method ABI object
function decodeMethod(method, data) {
  var outputNames = utils.getKeys(method.outputs, 'name', true);
  var outputTypes = utils.getKeys(method.outputs, 'type');

  return decodeParams(outputNames, outputTypes, utils.hexOrBuffer(data));
}

// decode method data bytecode, from method ABI object
function encodeEvent(eventObject, values) {
  return encodeMethod(eventObject, values);
}

function eventSignature(eventObject) {
  var signature = eventObject.name + '(' + utils.getKeys(eventObject.inputs, 'type').join(',') + ')';

  return '0x' + utils.keccak256(signature);
}

// decode method data bytecode, from method ABI object
function decodeEvent(eventObject, data, topics) {
  var useNumberedParams = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : true;

  var nonIndexed = eventObject.inputs.filter(function (input) {
    return !input.indexed;
  });
  var nonIndexedNames = utils.getKeys(nonIndexed, 'name', true);
  var nonIndexedTypes = utils.getKeys(nonIndexed, 'type');
  var event = decodeParams(nonIndexedNames, nonIndexedTypes, utils.hexOrBuffer(data), useNumberedParams);
  var topicOffset = eventObject.anonymous ? 0 : 1;

  eventObject.inputs.filter(function (input) {
    return input.indexed;
  }).map(function (input, i) {
    var topic = new Buffer(topics[i + topicOffset].slice(2), 'hex');
    var coder = getParamCoder(input.type);
    event[input.name] = coder.decode(topic, 0).value;
  });

  event._eventName = eventObject.name;

  return event;
}

// Decode a specific log item with a specific event abi
function decodeLogItem(eventObject, log) {
  var useNumberedParams = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : true;

  if (eventObject && log.topics[0] === eventSignature(eventObject)) {
    return decodeEvent(eventObject, log.data, log.topics, useNumberedParams);
  }
}

// Create a decoder for all events defined in an abi. It returns a function which is called
// on an array of log entries such as received from getLogs or getTransactionReceipt and parses
// any matching log entries
function logDecoder(abi) {
  var useNumberedParams = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;

  var eventMap = {};
  abi.filter(function (item) {
    return item.type === 'event';
  }).map(function (item) {
    eventMap[eventSignature(item)] = item;
  });
  return function (logItems) {
    return logItems.map(function (log) {
      return decodeLogItem(eventMap[log.topics[0]], log, useNumberedParams);
    }).filter(function (i) {
      return i;
    });
  };
}

module.exports = {
  encodeParams: encodeParams,
  decodeParams: decodeParams,
  encodeMethod: encodeMethod,
  decodeMethod: decodeMethod,
  encodeEvent: encodeEvent,
  decodeEvent: decodeEvent,
  decodeLogItem: decodeLogItem,
  logDecoder: logDecoder,
  eventSignature: eventSignature,
  encodeSignature: encodeSignature
};
}).call(this)}).call(this,require("buffer").Buffer)
},{"./utils/index.js":10,"@alayanetwork/ethereumjs-util":7,"buffer":211}],10:[function(require,module,exports){
(function (Buffer){(function (){
'use strict';

/*
Primary Attribution
Richard Moore <ricmoo@me.com>
https://github.com/ethers-io

Note, Richard is a god of ether gods. Follow and respect him, and use Ethers.io!
*/

var BN = require('bn.js');
var numberToBN = require('number-to-bn');
var keccak256 = require('js-sha3').keccak_256;

// from ethereumjs-util
function stripZeros(aInput) {
  var a = aInput; // eslint-disable-line
  var first = a[0]; // eslint-disable-line
  while (a.length > 0 && first.toString() === '0') {
    a = a.slice(1);
    first = a[0];
  }
  return a;
}

function bnToBuffer(bnInput) {
  var bn = bnInput; // eslint-disable-line
  var hex = bn.toString(16); // eslint-disable-line
  if (hex.length % 2) {
    hex = '0' + hex;
  }
  return stripZeros(new Buffer(hex, 'hex'));
}

function isHexString(value, length) {
  if (typeof value !== 'string' || !value.match(/^0x[0-9A-Fa-f]*$/)) {
    return false;
  }
  if (length && value.length !== 2 + 2 * length) {
    return false;
  }
  return true;
}

function hexOrBuffer(valueInput, name) {
  var value = valueInput; // eslint-disable-line
  if (!Buffer.isBuffer(value)) {
    if (!isHexString(value)) {
      var error = new Error(name ? '[ethjs-abi] invalid ' + name : '[ethjs-abi] invalid hex or buffer, must be a prefixed alphanumeric even length hex string');
      error.reason = '[ethjs-abi] invalid hex string, hex must be prefixed and alphanumeric (e.g. 0x023..)';
      error.value = value;
      throw error;
    }

    value = value.substring(2);
    if (value.length % 2) {
      value = '0' + value;
    }
    value = new Buffer(value, 'hex');
  }

  return value;
}

function hexlify(value) {
  if (typeof value === 'number') {
    return '0x' + bnToBuffer(new BN(value)).toString('hex');
  } else if (value.mod || value.modulo) {
    return '0x' + bnToBuffer(value).toString('hex');
  } else {
    // eslint-disable-line
    return '0x' + hexOrBuffer(value).toString('hex');
  }
}

// getKeys([{a: 1, b: 2}, {a: 3, b: 4}], 'a') => [1, 3]
function getKeys(params, key, allowEmpty) {
  var result = []; // eslint-disable-line

  if (!Array.isArray(params)) {
    throw new Error('[ethjs-abi] while getting keys, invalid params value ' + JSON.stringify(params));
  }

  for (var i = 0; i < params.length; i++) {
    // eslint-disable-line
    var value = params[i][key]; // eslint-disable-line
    if (allowEmpty && !value) {
      value = '';
    } else if (typeof value !== 'string') {
      throw new Error('[ethjs-abi] while getKeys found invalid ABI data structure, type value not string');
    }
    result.push(value);
  }

  return result;
}

function coderNumber(size, signed) {
  return {
    encode: function encodeNumber(valueInput) {
      var value = valueInput; // eslint-disable-line

      if (typeof value === 'object' && value.toString && (value.toTwos || value.dividedToIntegerBy)) {
        value = value.toString(10).split('.')[0];
      }

      if (typeof value === 'string' || typeof value === 'number') {
        value = String(value).split('.')[0];
      }

      value = numberToBN(value);
      value = value.toTwos(size * 8).maskn(size * 8);
      if (signed) {
        value = value.fromTwos(size * 8).toTwos(256);
      }
      return value.toArrayLike(Buffer, 'be', 32);
    },
    decode: function decodeNumber(data, offset) {
      var junkLength = 32 - size; // eslint-disable-line
      var value = new BN(data.slice(offset + junkLength, offset + 32)); // eslint-disable-line
      if (signed) {
        value = value.fromTwos(size * 8);
      } else {
        value = value.maskn(size * 8);
      }
      return {
        consumed: 32,
        value: new BN(value.toString(10))
      };
    }
  };
}
var uint256Coder = coderNumber(32, false);

var coderBoolean = {
  encode: function encodeBoolean(value) {
    return uint256Coder.encode(value ? 1 : 0);
  },
  decode: function decodeBoolean(data, offset) {
    var result = uint256Coder.decode(data, offset); // eslint-disable-line
    return {
      consumed: result.consumed,
      value: !result.value.isZero()
    };
  }
};

function coderFixedBytes(length) {
  return {
    encode: function encodeFixedBytes(valueInput) {
      var value = valueInput; // eslint-disable-line
      value = hexOrBuffer(value);

      if (value.length === 32) {
        return value;
      }

      var result = new Buffer(32); // eslint-disable-line
      result.fill(0);
      value.copy(result);
      return result;
    },
    decode: function decodeFixedBytes(data, offset) {
      if (data.length !== 0 && data.length < offset + 32) {
        throw new Error('[ethjs-abi] while decoding fixed bytes, invalid bytes data length: ' + length);
      }

      return {
        consumed: 32,
        value: '0x' + data.slice(offset, offset + length).toString('hex')
      };
    }
  };
}

var coderAddress = {
  encode: function encodeAddress(valueInput) {
    var value =