1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 | 1 1 1 1 1 314 1 7 7 7 7 7 1 1785 510 1275 1275 1 111 5 5 12 12 12 106 1 71 2 2 2 4 2 69 1 71 1 68 7 61 2 2 59 1 1 1 255 1785 255 2 253 1 65 65 72 64 64 64 64 64 64 1 112 1 12 1 89 89 100 99 99 1 3 1 3 1 62 62 61 68 68 68 1 1 | /* This file is part of ethereum.js. ethereum.js is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. ethereum.js is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with ethereum.js. If not, see <http://www.gnu.org/licenses/>. */ /** * @file coder.js * @author Marek Kotewicz <marek@ethdev.com> * @date 2015 */ var BigNumber = require('bignumber.js'); var utils = require('../utils/utils'); var f = require('./formatters'); var SolidityParam = require('./param'); /** * Should be used to check if a type is an array type * * @method isArrayType * @param {String} type * @return {Bool} true is the type is an array, otherwise false */ var isArrayType = function (type) { return type.slice(-2) === '[]'; }; /** * SolidityType prototype is used to encode/decode solidity params of certain type */ var SolidityType = function (config) { this._name = config.name; this._match = config.match; this._mode = config.mode; this._inputFormatter = config.inputFormatter; this._outputFormatter = config.outputFormatter; }; /** * Should be used to determine if this SolidityType do match given type * * @method isType * @param {String} name * @return {Bool} true if type match this SolidityType, otherwise false */ SolidityType.prototype.isType = function (name) { if (this._match === 'strict') { return this._name === name || (name.indexOf(this._name) === 0 && name.slice(this._name.length) === '[]'); } else Eif (this._match === 'prefix') { // TODO better type detection! return name.indexOf(this._name) === 0; } }; /** * Should be used to transform plain param to SolidityParam object * * @method formatInput * @param {Object} param - plain object, or an array of objects * @param {Bool} arrayType - true if a param should be encoded as an array * @return {SolidityParam} encoded param wrapped in SolidityParam object */ SolidityType.prototype.formatInput = function (param, arrayType) { if (utils.isArray(param) && arrayType) { // TODO: should fail if this two are not the same var self = this; return param.map(function (p) { return self._inputFormatter(p); }).reduce(function (acc, current) { acc.appendArrayElement(current); return acc; }, new SolidityParam('', f.formatInputInt(param.length).value)); } return this._inputFormatter(param); }; /** * Should be used to transoform SolidityParam to plain param * * @method formatOutput * @param {SolidityParam} byteArray * @param {Bool} arrayType - true if a param should be decoded as an array * @return {Object} plain decoded param */ SolidityType.prototype.formatOutput = function (param, arrayType) { if (arrayType) { // let's assume, that we solidity will never return long arrays :P var result = []; var length = new BigNumber(param.prefix, 16); for (var i = 0; i < length * 64; i += 64) { result.push(this._outputFormatter(new SolidityParam(param.suffix.slice(i, i + 64)))); } return result; } return this._outputFormatter(param); }; /** * Should be used to check if a type is variadic * * @method isVariadicType * @param {String} type * @returns {Bool} true if the type is variadic */ SolidityType.prototype.isVariadicType = function (type) { return isArrayType(type) || this._mode === 'bytes'; }; /** * Should be used to shift param from params group * * @method shiftParam * @param {String} type * @returns {SolidityParam} shifted param */ SolidityType.prototype.shiftParam = function (type, param) { if (this._mode === 'bytes') { return param.shiftBytes(); } else if (isArrayType(type)) { var length = new BigNumber(param.prefix.slice(0, 64), 16); return param.shiftArray(length); } return param.shiftValue(); }; /** * SolidityCoder prototype should be used to encode/decode solidity params of any type */ var SolidityCoder = function (types) { this._types = types; }; /** * This method should be used to transform type to SolidityType * * @method _requireType * @param {String} type * @returns {SolidityType} * @throws {Error} throws if no matching type is found */ SolidityCoder.prototype._requireType = function (type) { var solidityType = this._types.filter(function (t) { return t.isType(type); })[0]; if (!solidityType) { throw Error('invalid solidity type!: ' + type); } return solidityType; }; /** * Should be used to transform plain bytes to SolidityParam object * * @method _bytesToParam * @param {Array} types of params * @param {String} bytes to be transformed to SolidityParam * @return {SolidityParam} SolidityParam for this group of params */ SolidityCoder.prototype._bytesToParam = function (types, bytes) { var self = this; var prefixTypes = types.reduce(function (acc, type) { return self._requireType(type).isVariadicType(type) ? acc + 1 : acc; }, 0); var valueTypes = types.length - prefixTypes; var prefix = bytes.slice(0, prefixTypes * 64); bytes = bytes.slice(prefixTypes * 64); var value = bytes.slice(0, valueTypes * 64); var suffix = bytes.slice(valueTypes * 64); return new SolidityParam(value, prefix, suffix); }; /** * Should be used to transform plain param of given type to SolidityParam * * @method _formatInput * @param {String} type of param * @param {Object} plain param * @return {SolidityParam} */ SolidityCoder.prototype._formatInput = function (type, param) { return this._requireType(type).formatInput(param, isArrayType(type)); }; /** * Should be used to encode plain param * * @method encodeParam * @param {String} type * @param {Object} plain param * @return {String} encoded plain param */ SolidityCoder.prototype.encodeParam = function (type, param) { return this._formatInput(type, param).encode(); }; /** * Should be used to encode list of params * * @method encodeParams * @param {Array} types * @param {Array} params * @return {String} encoded list of params */ SolidityCoder.prototype.encodeParams = function (types, params) { var self = this; return types.map(function (type, index) { return self._formatInput(type, params[index]); }).reduce(function (acc, solidityParam) { acc.append(solidityParam); return acc; }, new SolidityParam()).encode(); }; /** * Should be used to transform SolidityParam to plain param * * @method _formatOutput * @param {String} type * @param {SolidityParam} param * @return {Object} plain param */ SolidityCoder.prototype._formatOutput = function (type, param) { return this._requireType(type).formatOutput(param, isArrayType(type)); }; /** * Should be used to decode bytes to plain param * * @method decodeParam * @param {String} type * @param {String} bytes * @return {Object} plain param */ SolidityCoder.prototype.decodeParam = function (type, bytes) { return this._formatOutput(type, this._bytesToParam([type], bytes)); }; /** * Should be used to decode list of params * * @method decodeParam * @param {Array} types * @param {String} bytes * @return {Array} array of plain params */ SolidityCoder.prototype.decodeParams = function (types, bytes) { var self = this; var param = this._bytesToParam(types, bytes); return types.map(function (type) { var solidityType = self._requireType(type); var p = solidityType.shiftParam(type, param); return solidityType.formatOutput(p, isArrayType(type)); }); }; var coder = new SolidityCoder([ new SolidityType({ name: 'address', match: 'strict', mode: 'value', inputFormatter: f.formatInputInt, outputFormatter: f.formatOutputAddress }), new SolidityType({ name: 'bool', match: 'strict', mode: 'value', inputFormatter: f.formatInputBool, outputFormatter: f.formatOutputBool }), new SolidityType({ name: 'int', match: 'prefix', mode: 'value', inputFormatter: f.formatInputInt, outputFormatter: f.formatOutputInt, }), new SolidityType({ name: 'uint', match: 'prefix', mode: 'value', inputFormatter: f.formatInputInt, outputFormatter: f.formatOutputUInt }), new SolidityType({ name: 'bytes', match: 'prefix', mode: 'bytes', inputFormatter: f.formatInputBytes, outputFormatter: f.formatOutputBytes }), new SolidityType({ name: 'real', match: 'prefix', mode: 'value', inputFormatter: f.formatInputReal, outputFormatter: f.formatOutputReal }), new SolidityType({ name: 'ureal', match: 'prefix', mode: 'value', inputFormatter: f.formatInputReal, outputFormatter: f.formatOutputUReal }) ]); module.exports = coder; |