296 lines
9.3 KiB
JavaScript
296 lines
9.3 KiB
JavaScript
/*
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This file is part of ethereum.js.
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ethereum.js is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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ethereum.js is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with ethereum.js. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file abi.js
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* @authors:
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* Marek Kotewicz <marek@ethdev.com>
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* Gav Wood <g@ethdev.com>
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* @date 2014
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*/
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// TODO: is these line is supposed to be here?
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if (process.env.NODE_ENV !== 'build') {
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var web3 = require('./web3'); // jshint ignore:line
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}
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// TODO: make these be actually accurate instead of falling back onto JS's doubles.
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var hexToDec = function (hex) {
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return parseInt(hex, 16).toString();
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};
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var decToHex = function (dec) {
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return parseInt(dec).toString(16);
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};
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/// Finds first index of array element matching pattern
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/// @param array
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/// @param callback pattern
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/// @returns index of element
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var findIndex = function (array, callback) {
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var end = false;
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var i = 0;
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for (; i < array.length && !end; i++) {
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end = callback(array[i]);
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}
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return end ? i - 1 : -1;
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};
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/// @returns a function that is used as a pattern for 'findIndex'
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var findMethodIndex = function (json, methodName) {
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return findIndex(json, function (method) {
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return method.name === methodName;
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});
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};
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/// @param string string to be padded
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/// @param number of characters that result string should have
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/// @param sign, by default 0
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/// @returns right aligned string
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var padLeft = function (string, chars, sign) {
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return new Array(chars - string.length + 1).join(sign ? sign : "0") + string;
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};
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/// @param expected type prefix (string)
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/// @returns function which checks if type has matching prefix. if yes, returns true, otherwise false
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var prefixedType = function (prefix) {
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return function (type) {
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return type.indexOf(prefix) === 0;
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};
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};
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/// @param expected type name (string)
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/// @returns function which checks if type is matching expected one. if yes, returns true, otherwise false
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var namedType = function (name) {
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return function (type) {
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return name === type;
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};
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};
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/// Setups input formatters for solidity types
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/// @returns an array of input formatters
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var setupInputTypes = function () {
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/// Formats input value to byte representation of int
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/// @returns right-aligned byte representation of int
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var formatInt = function (value) {
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var padding = 32 * 2;
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if (typeof value === 'number') {
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if (value < 0) {
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// two's complement
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// TODO: fix big numbers support
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value = ((value) >>> 0).toString(16);
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return padLeft(value, padding, 'f');
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}
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value = value.toString(16);
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}
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else if (value.indexOf('0x') === 0)
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value = value.substr(2);
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else if (typeof value === 'string')
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value = value.toHex(value);
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else
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value = (+value).toString(16);
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return padLeft(value, padding);
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};
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/// Formats input value to byte representation of string
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/// @returns left-algined byte representation of string
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var formatString = function (value) {
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return web3.fromAscii(value, 32).substr(2);
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};
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/// Formats input value to byte representation of bool
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/// @returns right-aligned byte representation bool
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var formatBool = function (value) {
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return '000000000000000000000000000000000000000000000000000000000000000' + (value ? '1' : '0');
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};
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return [
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{ type: prefixedType('uint'), format: formatInt },
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{ type: prefixedType('int'), format: formatInt },
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{ type: prefixedType('hash'), format: formatInt },
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{ type: prefixedType('string'), format: formatString },
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{ type: prefixedType('real'), format: formatInt },
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{ type: prefixedType('ureal'), format: formatInt },
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{ type: namedType('address'), format: formatInt },
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{ type: namedType('bool'), format: formatBool }
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];
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};
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var inputTypes = setupInputTypes();
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/// Formats input params to bytes
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/// @param contract json abi
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/// @param name of the method that we want to use
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/// @param array of params that will be formatted to bytes
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/// @returns bytes representation of input params
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var toAbiInput = function (json, methodName, params) {
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var bytes = "";
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var index = findMethodIndex(json, methodName);
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if (index === -1) {
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return;
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}
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var method = json[index];
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var padding = 32 * 2;
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for (var i = 0; i < method.inputs.length; i++) {
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var typeMatch = false;
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for (var j = 0; j < inputTypes.length && !typeMatch; j++) {
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typeMatch = inputTypes[j].type(method.inputs[i].type, params[i]);
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}
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if (!typeMatch) {
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console.error('input parser does not support type: ' + method.inputs[i].type);
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}
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var formatter = inputTypes[j - 1].format;
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bytes += (formatter ? formatter(params[i]) : params[i]);
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}
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return bytes;
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};
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/// Setups output formaters for solidity types
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/// @returns an array of output formatters
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var setupOutputTypes = function () {
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/// Formats input right-aligned input bytes to int
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/// @returns right-aligned input bytes formatted to int
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var formatInt = function (value) {
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return value.length <= 8 ? +parseInt(value, 16) : hexToDec(value);
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};
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/// @returns right-aligned input bytes formatted to hex
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var formatHash = function (value) {
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return "0x" + value;
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};
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/// @returns right-aligned input bytes formatted to bool
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var formatBool = function (value) {
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return value === '0000000000000000000000000000000000000000000000000000000000000001' ? true : false;
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};
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/// @returns left-aligned input bytes formatted to ascii string
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var formatString = function (value) {
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return web3.toAscii(value);
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};
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/// @returns right-aligned input bytes formatted to address
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var formatAddress = function (value) {
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return "0x" + value.slice(value.length - 40, value.length);
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};
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return [
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{ type: prefixedType('uint'), format: formatInt },
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{ type: prefixedType('int'), format: formatInt },
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{ type: prefixedType('hash'), format: formatHash },
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{ type: prefixedType('string'), format: formatString },
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{ type: prefixedType('real'), format: formatInt },
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{ type: prefixedType('ureal'), format: formatInt },
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{ type: namedType('address'), format: formatAddress },
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{ type: namedType('bool'), format: formatBool }
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];
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};
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var outputTypes = setupOutputTypes();
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/// Formats output bytes back to param list
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/// @param contract json abi
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/// @param name of the method that we want to use
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/// @param bytes representtion of output
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/// @returns array of output params
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var fromAbiOutput = function (json, methodName, output) {
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var index = findMethodIndex(json, methodName);
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if (index === -1) {
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return;
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}
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output = output.slice(2);
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var result = [];
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var method = json[index];
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var padding = 32 * 2;
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for (var i = 0; i < method.outputs.length; i++) {
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var typeMatch = false;
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for (var j = 0; j < outputTypes.length && !typeMatch; j++) {
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typeMatch = outputTypes[j].type(method.outputs[i].type);
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}
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if (!typeMatch) {
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// not found output parsing
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console.error('output parser does not support type: ' + method.outputs[i].type);
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continue;
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}
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var res = output.slice(0, padding);
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var formatter = outputTypes[j - 1].format;
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result.push(formatter ? formatter(res) : ("0x" + res));
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output = output.slice(padding);
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}
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return result;
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};
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/// @param json abi for contract
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/// @returns input parser object for given json abi
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var inputParser = function (json) {
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var parser = {};
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json.forEach(function (method) {
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parser[method.name] = function () {
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var params = Array.prototype.slice.call(arguments);
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return toAbiInput(json, method.name, params);
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};
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});
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return parser;
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};
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/// @param json abi for contract
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/// @returns output parser for given json abi
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var outputParser = function (json) {
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var parser = {};
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json.forEach(function (method) {
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parser[method.name] = function (output) {
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return fromAbiOutput(json, method.name, output);
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};
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});
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return parser;
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};
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/// @param json abi for contract
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/// @param method name for which we want to get method signature
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/// @returns (promise) contract method signature for method with given name
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var methodSignature = function (json, name) {
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var method = json[findMethodIndex(json, name)];
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var result = name + '(';
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var inputTypes = method.inputs.map(function (inp) {
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return inp.type;
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});
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result += inputTypes.join(',');
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result += ')';
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return web3.sha3(web3.fromAscii(result));
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};
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module.exports = {
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inputParser: inputParser,
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outputParser: outputParser,
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methodSignature: methodSignature
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};
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