394 lines
13 KiB
TypeScript
394 lines
13 KiB
TypeScript
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'use strict';
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// See: https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI
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import { defaultAbiCoder, ParamType, parseSignature } from '../utils/abi-coder';
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import { BigNumber, bigNumberify, BigNumberish } from '../utils/bignumber';
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import { arrayify, concat, isHexString } from '../utils/convert';
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import { keccak256 } from '../utils/keccak256';
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import { toUtf8Bytes } from '../utils/utf8';
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import { defineReadOnly, defineFrozen } from '../utils/properties';
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import * as errors from '../utils/errors';
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function parseParams(params: Array<ParamType>): { names: Array<any>, types: Array<any> } {
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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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export class Indexed {
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readonly hash: string;
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constructor(value) {
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defineReadOnly(this, 'indexed', true);
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defineReadOnly(this, 'hash', value);
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}
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}
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export class Description {
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readonly type: string;
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readonly inputs: Array<ParamType>;
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constructor(info: any) {
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for (var key in info) {
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let value = info[key];
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if (value != null && typeof(value) === 'object') {
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defineFrozen(this, key, info[key]);
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} else {
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defineReadOnly(this, key, info[key]);
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}
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}
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}
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}
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export class DeployDescription extends Description {
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readonly payable: boolean;
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encode(bytecode: string, params: Array<any>): string {
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if (!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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if (params.length < this.inputs.length) {
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errors.throwError('missing constructor argument', errors.MISSING_ARGUMENT, {
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arg: (this.inputs[params.length].name || 'unknown'),
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count: params.length,
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expectedCount: this.inputs.length
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});
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} else if (params.length > this.inputs.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: this.inputs.length
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});
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}
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try {
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return (bytecode + defaultAbiCoder.encode(this.inputs, params).substring(2));
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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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return null;
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}
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}
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export class FunctionDescription extends Description {
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readonly name: string;
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readonly signature: string;
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readonly sighash: string;
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readonly outputs: Array<ParamType>;
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readonly payable: boolean;
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encode(params: Array<any>): string {
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if (params.length < this.inputs.length) {
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errors.throwError('missing input argument', errors.MISSING_ARGUMENT, {
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arg: (this.inputs[params.length].name || 'unknown'),
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count: params.length,
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expectedCount: this.inputs.length,
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name: this.name
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});
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} else if (params.length > this.inputs.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: this.inputs.length
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});
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}
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try {
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return this.sighash + defaultAbiCoder.encode(this.inputs, params).substring(2);
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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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return null;
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}
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decode(data: string): any {
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try {
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return defaultAbiCoder.decode(this.outputs, arrayify(data));
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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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}
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// @TODO: sub-class a description
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export type CallTransaction = {
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args: Array<any>,
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signature: string,
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sighash: string,
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decode: (data: string) => any,
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value: BigNumber
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}
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// @TODO: Make this a class
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function Result() {}
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export class EventDescription extends Description {
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readonly name: string;
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readonly signature: string;
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readonly anonymous: boolean;
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readonly topic: string;
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decode(data: string, topics?: Array<string>): any {
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// Strip the signature off of non-anonymous topics
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if (topics != null && !this.anonymous) { topics = topics.slice(1); }
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let inputIndexed = [], inputNonIndexed = [];
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let inputDynamic = [];
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this.inputs.forEach(function(param, index) {
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if (param.indexed) {
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if (param.type === 'string' || param.type === 'bytes' || param.type.indexOf('[') >= 0 || param.type.substring(0, 5) === 'tuple') {
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inputIndexed.push({ type: 'bytes32', name: (param.name || '')});
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inputDynamic.push(true);
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} else {
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inputIndexed.push(param);
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inputDynamic.push(false);
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}
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} else {
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inputNonIndexed.push(param);
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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 = defaultAbiCoder.decode(
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inputIndexed,
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concat(topics)
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);
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}
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var resultNonIndexed = defaultAbiCoder.decode(
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inputNonIndexed,
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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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this.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 = this.inputs.length;
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return result;
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}
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}
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// @TODO:
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//export class Result {
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// [prop: string]: any;
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//}
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function addMethod(method: any): void {
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switch (method.type) {
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case 'constructor': {
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let description = new DeployDescription({
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inputs: method.inputs,
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payable: (method.payable == null || !!method.payable),
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type: 'deploy'
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});
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if (!this.deployFunction) { this.deployFunction = description; }
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break;
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}
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case 'function': {
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// @TODO: See event
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let signature = '(' + parseParams(method.inputs).types.join(',') + ')';
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signature = signature.replace(/tuple/g, '');
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signature = method.name + signature;
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let sighash = keccak256(toUtf8Bytes(signature)).substring(0, 10);
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let description = new FunctionDescription({
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inputs: method.inputs,
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outputs: method.outputs,
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payable: (method.payable == null || !!method.payable),
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type: ((method.constant) ? 'call': 'transaction'),
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signature: signature,
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sighash: sighash,
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});
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// Expose the first (and hopefully unique named function
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if (method.name && this.functions[method.name] == null) {
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defineReadOnly(this.functions, method.name, description);
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}
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// Expose all methods by their signature, for overloaded functions
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if (this.functions[description.signature] == null) {
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defineReadOnly(this.functions, description.signature, description);
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}
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break;
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}
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case 'event': {
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// @TODO: method.params instead? As well? Different fomrat?
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//let inputParams = parseParams(method.inputs);
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// @TODO: Don't use parseParams (create new function in ABI, formatSignature)
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let signature = '(' + parseParams(method.inputs).types.join(',') + ')';
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signature = signature.replace(/tuple/g, '');
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signature = method.name + signature;
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let description = new EventDescription({
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name: method.name,
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signature: signature,
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inputs: method.inputs,
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topics: [ keccak256(toUtf8Bytes(signature)) ],
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anonymous: (!!method.anonymous),
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type: 'event'
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});
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// Expose the first (and hopefully unique) event name
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if (method.name && this.events[method.name] == null) {
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defineReadOnly(this.events, method.name, description);
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}
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// Expose all events by their signature, for overloaded functions
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if (this.events[description.signature] == null) {
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defineReadOnly(this.events, description.signature, description);
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}
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break;
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}
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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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export class Interface {
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readonly _abi: Array<any>;
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readonly functions: Array<FunctionDescription>;
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readonly events: Array<EventDescription>;
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readonly deployFunction: DeployDescription;
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constructor(abi: Array<string | ParamType> | string) {
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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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if (!Array.isArray(abi)) {
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errors.throwError('invalid abi', errors.INVALID_ARGUMENT, { arg: 'abi', value: abi });
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return null;
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}
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}
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defineReadOnly(this, 'functions', { });
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defineReadOnly(this, 'events', { });
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// Convert any supported ABI format into a standard ABI format
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this._abi = [];
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abi.forEach((fragment) => {
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if (typeof(fragment) === 'string') {
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fragment = parseSignature(fragment);
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}
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this._abi.push(fragment);
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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 (!this.deployFunction) {
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addMethod.call(this, {type: 'constructor', inputs: []});
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}
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}
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parseTransaction(tx: { data: string, value?: BigNumberish }): CallTransaction {
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var sighash = tx.data.substring(0, 10).toLowerCase();
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for (var name in this.functions) {
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if (name.indexOf('(') === -1) { continue; }
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var func = this.functions[name];
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if (func.sighash === sighash) {
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var result = defaultAbiCoder.decode(func.inputs, '0x' + tx.data.substring(10));
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return {
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args: result,
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signature: func.signature,
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sighash: func.sighash,
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decode: func.decode,
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value: bigNumberify(tx.value || 0),
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}
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}
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}
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return null;
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}
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}
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