395 lines
15 KiB
JavaScript
395 lines
15 KiB
JavaScript
'use strict';
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// See: https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI
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var utils = (function() {
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var convert = require('../utils/convert');
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var properties = require('../utils/properties');
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var utf8 = require('../utils/utf8');
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return {
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defineFrozen: properties.defineFrozen,
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defineProperty: properties.defineProperty,
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coder: require('../utils/abi-coder').defaultCoder,
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arrayify: convert.arrayify,
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concat: convert.concat,
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isHexString: convert.isHexString,
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toUtf8Bytes: utf8.toUtf8Bytes,
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keccak256: require('../utils/keccak256'),
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};
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})();
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var errors = require('../utils/errors');
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function parseParams(params) {
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var names = [];
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var types = [];
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params.forEach(function(param) {
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if (param.components != null) {
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if (param.type.substring(0, 5) !== 'tuple') {
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throw new Error('internal error; report on GitHub');
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}
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var suffix = '';
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var arrayBracket = param.type.indexOf('[');
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if (arrayBracket >= 0) { suffix = param.type.substring(arrayBracket); }
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var result = parseParams(param.components);
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names.push({ name: (param.name || null), names: result.names });
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types.push('tuple(' + result.types.join(',') + ')' + suffix)
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} else {
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names.push(param.name || null);
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types.push(param.type);
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}
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});
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return {
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names: names,
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types: types
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}
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}
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function populateDescription(object, items) {
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for (var key in items) {
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utils.defineProperty(object, key, items[key]);
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}
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return object;
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}
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/**
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* - bytecode (optional; only for deploy)
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* - type ("deploy")
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*/
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function DeployDescription() { }
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/**
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* - name
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* - signature
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* - sighash
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* -
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* -
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* -
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* -
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* - type: ("call" | "transaction")
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*/
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function FunctionDescription() { }
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/**
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* - anonymous
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* - name
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* - signature
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* - parse
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* - topics
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* - inputs
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* - type ("event")
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*/
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function EventDescription() { }
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function Indexed(value) {
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utils.defineProperty(this, 'indexed', true);
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utils.defineProperty(this, 'hash', value);
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}
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function Result() {}
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function Interface(abi) {
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if (!(this instanceof Interface)) { throw new Error('missing new'); }
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if (typeof(abi) === 'string') {
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try {
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abi = JSON.parse(abi);
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} catch (error) {
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errors.throwError('could not parse ABI JSON', errors.INVALID_ARGUMENT, {
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arg: 'abi',
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errorMessage: error.message,
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value: abi
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});
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}
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}
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utils.defineFrozen(this, 'abi', abi);
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var methods = {}, events = {}, deploy = null;
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utils.defineProperty(this, 'functions', methods);
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utils.defineProperty(this, 'events', events);
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function addMethod(method) {
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switch (method.type) {
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case 'constructor':
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var func = (function() {
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var inputParams = parseParams(method.inputs);
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var func = function(bytecode) {
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if (!utils.isHexString(bytecode)) {
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errors.throwError('invalid contract bytecode', errors.INVALID_ARGUMENT, {
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arg: 'bytecode',
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type: typeof(bytecode),
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value: bytecode
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});
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}
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var params = Array.prototype.slice.call(arguments, 1);
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if (params.length < inputParams.types.length) {
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errors.throwError('missing constructor argument', errors.MISSING_ARGUMENT, {
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arg: (inputParams.names[params.length] || 'unknown'),
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count: params.length,
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expectedCount: inputParams.types.length
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});
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} else if (params.length > inputParams.types.length) {
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errors.throwError('too many constructor arguments', errors.UNEXPECTED_ARGUMENT, {
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count: params.length,
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expectedCount: inputParams.types.length
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});
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}
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try {
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var encodedParams = utils.coder.encode(inputParams.names, inputParams.types, params)
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} catch (error) {
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errors.throwError('invalid constructor argument', errors.INVALID_ARGUMENT, {
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arg: error.arg,
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reason: error.reason,
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value: error.value
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});
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}
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var result = {
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bytecode: bytecode + encodedParams.substring(2),
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type: 'deploy'
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}
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return populateDescription(new DeployDescription(), result);
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}
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utils.defineFrozen(func, 'inputs', inputParams);
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utils.defineProperty(func, 'payable', (method.payable == null || !!method.payable))
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return func;
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})();
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if (!deploy) { deploy = func; }
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break;
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case 'function':
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var func = (function() {
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var inputParams = parseParams(method.inputs);
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var outputParams = parseParams(method.outputs);
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var signature = '(' + inputParams.types.join(',') + ')';
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signature = signature.replace(/tuple/g, '');
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signature = method.name + signature;
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var parse = function(data) {
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try {
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return utils.coder.decode(
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outputParams.names,
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outputParams.types,
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utils.arrayify(data)
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);
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} catch(error) {
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errors.throwError('invalid data for function output', errors.INVALID_ARGUMENT, {
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arg: 'data',
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errorArg: error.arg,
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errorValue: error.value,
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value: data,
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reason: error.reason
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});
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}
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};
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var sighash = utils.keccak256(utils.toUtf8Bytes(signature)).substring(0, 10);
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var func = function() {
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var result = {
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name: method.name,
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signature: signature,
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sighash: sighash,
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type: ((method.constant) ? 'call': 'transaction')
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};
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var params = Array.prototype.slice.call(arguments, 0);
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if (params.length < inputParams.types.length) {
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errors.throwError('missing input argument', errors.MISSING_ARGUMENT, {
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arg: (inputParams.names[params.length] || 'unknown'),
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count: params.length,
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expectedCount: inputParams.types.length,
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name: method.name
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});
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} else if (params.length > inputParams.types.length) {
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errors.throwError('too many input arguments', errors.UNEXPECTED_ARGUMENT, {
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count: params.length,
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expectedCount: inputParams.types.length
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});
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}
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try {
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var encodedParams = utils.coder.encode(inputParams.names, inputParams.types, params);
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} catch (error) {
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errors.throwError('invalid input argument', errors.INVALID_ARGUMENT, {
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arg: error.arg,
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reason: error.reason,
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value: error.value
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});
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}
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result.data = sighash + encodedParams.substring(2);
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result.parse = parse;
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return populateDescription(new FunctionDescription(), result);
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}
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utils.defineFrozen(func, 'inputs', inputParams);
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utils.defineFrozen(func, 'outputs', outputParams);
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utils.defineProperty(func, 'payable', (method.payable == null || !!method.payable))
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utils.defineProperty(func, 'parseResult', parse);
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utils.defineProperty(func, 'signature', signature);
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utils.defineProperty(func, 'sighash', sighash);
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return func;
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})();
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// Expose the first (and hopefully unique named function
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if (method.name && methods[method.name] == null) {
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utils.defineProperty(methods, method.name, func);
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}
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// Expose all methods by their signature, for overloaded functions
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if (methods[func.signature] == null) {
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utils.defineProperty(methods, func.signature, func);
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}
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break;
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case 'event':
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var func = (function() {
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var inputParams = parseParams(method.inputs);
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var signature = '(' + inputParams.types.join(',') + ')';
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signature = signature.replace(/tuple/g, '');
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signature = method.name + signature;
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var result = {
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anonymous: (!!method.anonymous),
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name: method.name,
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signature: signature,
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type: 'event'
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};
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result.parse = function(topics, data) {
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if (data == null) {
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data = topics;
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topics = null;
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}
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// Strip the signature off of non-anonymous topics
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if (topics != null && !method.anonymous) { topics = topics.slice(1); }
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var inputNamesIndexed = [], inputNamesNonIndexed = [];
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var inputTypesIndexed = [], inputTypesNonIndexed = [];
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var inputDynamic = [];
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method.inputs.forEach(function(input, index) {
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var type = inputParams.types[index];
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var name = inputParams.names[index];
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if (input.indexed) {
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if (type === 'string' || type === 'bytes' || type.indexOf('[') >= 0 || type.substring(0, 5) === 'tuple') {
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inputTypesIndexed.push('bytes32');
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inputDynamic.push(true);
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} else {
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inputTypesIndexed.push(type);
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inputDynamic.push(false);
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}
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inputNamesIndexed.push(name);
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} else {
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inputNamesNonIndexed.push(name);
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inputTypesNonIndexed.push(type);
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inputDynamic.push(false);
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}
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});
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if (topics != null) {
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var resultIndexed = utils.coder.decode(
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inputNamesIndexed,
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inputTypesIndexed,
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utils.concat(topics)
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);
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}
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var resultNonIndexed = utils.coder.decode(
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inputNamesNonIndexed,
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inputTypesNonIndexed,
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utils.arrayify(data)
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);
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var result = new Result();
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var nonIndexedIndex = 0, indexedIndex = 0;
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method.inputs.forEach(function(input, index) {
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if (input.indexed) {
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if (topics == null) {
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result[index] = new Indexed(null);
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} else if (inputDynamic[index]) {
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result[index] = new Indexed(resultIndexed[indexedIndex++]);
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} else {
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result[index] = resultIndexed[indexedIndex++];
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}
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} else {
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result[index] = resultNonIndexed[nonIndexedIndex++];
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}
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if (input.name) { result[input.name] = result[index]; }
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});
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result.length = method.inputs.length;
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return result;
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};
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var func = populateDescription(new EventDescription(), result)
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utils.defineFrozen(func, 'topics', [ utils.keccak256(utils.toUtf8Bytes(signature)) ]);
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utils.defineFrozen(func, 'inputs', inputParams);
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return func;
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})();
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// Expose the first (and hopefully unique) event name
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if (method.name && events[method.name] == null) {
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utils.defineProperty(events, method.name, func);
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}
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// Expose all events by their signature, for overloaded functions
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if (methods[func.signature] == null) {
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utils.defineProperty(methods, func.signature, func);
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}
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break;
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case 'fallback':
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// Nothing to do for fallback
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break;
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default:
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console.log('WARNING: unsupported ABI type - ' + method.type);
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break;
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}
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};
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this.abi.forEach(addMethod, this);
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// If there wasn't a constructor, create the default constructor
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if (!deploy) {
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addMethod({type: 'constructor', inputs: []});
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}
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utils.defineProperty(this, 'deployFunction', deploy);
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}
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module.exports = Interface;
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