424 lines
15 KiB
TypeScript
424 lines
15 KiB
TypeScript
"use strict";
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import { getAddress } from "@ethersproject/address";
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import { BigNumber, BigNumberish } from "@ethersproject/bignumber";
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import { arrayify, BytesLike, concat, hexDataSlice, hexlify, hexZeroPad, isHexString } from "@ethersproject/bytes";
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import { id } from "@ethersproject/hash";
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import { keccak256 } from "@ethersproject/keccak256"
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import { defineReadOnly, Description, getStatic } from "@ethersproject/properties";
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import { AbiCoder, defaultAbiCoder } from "./abi-coder";
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import { ConstructorFragment, EventFragment, Fragment, FunctionFragment, JsonFragment, ParamType } from "./fragments";
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import { Logger } from "@ethersproject/logger";
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import { version } from "./_version";
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const logger = new Logger(version);
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export class LogDescription extends Description {
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readonly eventFragment: EventFragment;
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readonly name: string;
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readonly signature: string;
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readonly topic: string;
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readonly values: any
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}
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export class TransactionDescription extends Description {
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readonly functionFragment: FunctionFragment;
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readonly name: string;
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readonly args: Array<any>;
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readonly signature: string;
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readonly sighash: string;
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readonly value: BigNumber;
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}
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export class Indexed extends Description {
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readonly hash: string;
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static isIndexed(value: any): value is Indexed {
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return !!(value && value._isIndexed);
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}
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}
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export class Result {
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[key: string]: any;
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[key: number]: any;
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}
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export class Interface {
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readonly fragments: Array<Fragment>;
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readonly errors: { [ name: string ]: any };
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readonly events: { [ name: string ]: EventFragment };
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readonly functions: { [ name: string ]: FunctionFragment };
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readonly structs: { [ name: string ]: any };
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readonly deploy: ConstructorFragment;
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readonly _abiCoder: AbiCoder;
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static _isInterface: boolean;
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constructor(fragments: string | Array<Fragment | JsonFragment | string>) {
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logger.checkNew(new.target, Interface);
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let abi: Array<Fragment | JsonFragment | string> = [ ];
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if (typeof(fragments) === "string") {
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abi = JSON.parse(fragments);
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} else {
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abi = fragments;
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}
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defineReadOnly(this, "fragments", abi.map((fragment) => {
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return Fragment.from(fragment);
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}).filter((fragment) => (fragment != null)));
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defineReadOnly(this, "_abiCoder", getStatic<() => AbiCoder>(new.target, "getAbiCoder")());
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defineReadOnly(this, "functions", { });
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defineReadOnly(this, "errors", { });
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defineReadOnly(this, "events", { });
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defineReadOnly(this, "structs", { });
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// Add all fragments by their signature
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this.fragments.forEach((fragment) => {
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let bucket: { [ name: string ]: Fragment } = null;
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switch (fragment.type) {
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case "constructor":
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if (this.deploy) {
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logger.warn("duplicate definition - constructor");
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return;
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}
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defineReadOnly(this, "deploy", fragment);
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return;
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case "function":
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bucket = this.functions;
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break;
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case "event":
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bucket = this.events;
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break;
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default:
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return;
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}
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let signature = fragment.format();
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if (bucket[signature]) {
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logger.warn("duplicate definition - " + signature);
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return;
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}
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bucket[signature] = fragment;
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});
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// Add any fragments with a unique name by its name (sans signature parameters)
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[this.events, this.functions].forEach((bucket) => {
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let count = getNameCount(bucket);
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Object.keys(bucket).forEach((signature) => {
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let fragment = bucket[signature];
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if (count[fragment.name] !== 1) {
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logger.warn("duplicate definition - " + fragment.name);
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return;
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}
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bucket[fragment.name] = fragment;
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});
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});
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// If we do not have a constructor use the default "constructor() payable"
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if (!this.deploy) {
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defineReadOnly(this, "deploy", ConstructorFragment.from( { type: "constructor" } ));
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}
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defineReadOnly(this, "_isInterface", true);
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}
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static getAbiCoder(): AbiCoder {
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return defaultAbiCoder;
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}
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static getAddress(address: string): string {
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return getAddress(address);
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}
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_sighashify(functionFragment: FunctionFragment): string {
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return hexDataSlice(id(functionFragment.format()), 0, 4);
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}
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_topicify(eventFragment: EventFragment): string {
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return id(eventFragment.format());
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}
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getFunction(nameOrSignatureOrSighash: string): FunctionFragment {
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if (isHexString(nameOrSignatureOrSighash)) {
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return <FunctionFragment>getFragment(nameOrSignatureOrSighash, this.getSighash.bind(this), this.functions);
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}
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// It is a bare name, look up the function (will return null if ambiguous)
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if (nameOrSignatureOrSighash.indexOf("(") === -1) {
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return (this.functions[nameOrSignatureOrSighash.trim()] || null);
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}
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// Normlize the signature and lookup the function
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return this.functions[FunctionFragment.fromString(nameOrSignatureOrSighash).format()];
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}
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getEvent(nameOrSignatureOrTopic: string): EventFragment {
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if (isHexString(nameOrSignatureOrTopic)) {
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return <EventFragment>getFragment(nameOrSignatureOrTopic, this.getEventTopic.bind(this), this.events);
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}
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// It is a bare name, look up the function (will return null if ambiguous)
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if (nameOrSignatureOrTopic.indexOf("(") === -1) {
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return this.events[nameOrSignatureOrTopic];
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}
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return this.events[EventFragment.fromString(nameOrSignatureOrTopic).format()];
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}
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getSighash(functionFragment: FunctionFragment | string): string {
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if (typeof(functionFragment) === "string") {
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functionFragment = this.getFunction(functionFragment);
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}
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return this._sighashify(functionFragment);
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}
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getEventTopic(eventFragment: EventFragment | string): string {
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if (typeof(eventFragment) === "string") {
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eventFragment = this.getEvent(eventFragment);
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}
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return this._topicify(eventFragment);
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}
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_encodeParams(params: Array<ParamType>, values: Array<any>): string {
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return this._abiCoder.encode(params, values)
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}
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encodeDeploy(values?: Array<any>): string {
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return this._encodeParams(this.deploy.inputs, values || [ ]);
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}
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encodeFunctionData(functionFragment: FunctionFragment | string, values?: Array<any>): string {
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if (typeof(functionFragment) === "string") {
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functionFragment = this.getFunction(functionFragment);
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}
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return hexlify(concat([
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this.getSighash(functionFragment),
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this._encodeParams(functionFragment.inputs, values || [ ])
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]));
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}
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decodeFunctionResult(functionFragment: FunctionFragment | string, data: BytesLike): Array<any> {
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if (typeof(functionFragment) === "string") {
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functionFragment = this.getFunction(functionFragment);
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}
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let bytes = arrayify(data);
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let reason: string = null;
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let errorSignature: string = null;
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switch (bytes.length % this._abiCoder._getWordSize()) {
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case 0:
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try {
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return this._abiCoder.decode(functionFragment.outputs, bytes);
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} catch (error) { }
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break;
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case 4:
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if (hexlify(bytes.slice(0, 4)) === "0x08c379a0") {
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errorSignature = "Error(string)";
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reason = this._abiCoder.decode([ "string" ], bytes.slice(4));
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}
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break;
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}
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return logger.throwError("call revert exception", Logger.errors.CALL_EXCEPTION, {
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method: functionFragment.format(),
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errorSignature: errorSignature,
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errorArgs: [ reason ],
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reason: reason
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});
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}
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encodeFilterTopics(eventFragment: EventFragment, values: Array<any>): Array<string | Array<string>> {
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if (typeof(eventFragment) === "string") {
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eventFragment = this.getEvent(eventFragment);
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}
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if (values.length > eventFragment.inputs.length) {
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logger.throwError("too many arguments for " + eventFragment.format(), Logger.errors.UNEXPECTED_ARGUMENT, {
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argument: "values",
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value: values
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})
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}
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let topics: Array<string> = [];
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if (!eventFragment.anonymous) { topics.push(this.getEventTopic(eventFragment)); }
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values.forEach((value, index) => {
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let param = eventFragment.inputs[index];
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if (!param.indexed) {
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if (value != null) {
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logger.throwArgumentError("cannot filter non-indexed parameters; must be null", ("contract." + param.name), value);
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}
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return;
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}
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if (value == null) {
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topics.push(null);
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} else if (param.type === "string") {
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topics.push(id(value));
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} else if (param.type === "bytes") {
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topics.push(keccak256(hexlify(value)));
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} else if (param.type.indexOf("[") !== -1 || param.type.substring(0, 5) === "tuple") {
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logger.throwArgumentError("filtering with tuples or arrays not supported", ("contract." + param.name), value);
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} else {
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// Check addresses are valid
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if (param.type === "address") { this._abiCoder.encode( [ "address" ], [ value ]); }
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topics.push(hexZeroPad(hexlify(value), 32));
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}
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});
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// Trim off trailing nulls
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while (topics.length && topics[topics.length - 1] === null) {
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topics.pop();
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}
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return topics;
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}
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decodeEventLog(eventFragment: EventFragment | string, data: BytesLike, topics?: Array<string>): Array<any> {
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if (typeof(eventFragment) === "string") {
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eventFragment = this.getEvent(eventFragment);
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}
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if (topics != null && !eventFragment.anonymous) {
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let topicHash = this.getEventTopic(eventFragment);
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if (!isHexString(topics[0], 32) || topics[0].toLowerCase() !== topicHash) {
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logger.throwError("fragment/topic mismatch", Logger.errors.INVALID_ARGUMENT, { argument: "topics[0]", expected: topicHash, value: topics[0] });
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}
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topics = topics.slice(1);
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}
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let indexed: Array<ParamType> = [];
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let nonIndexed: Array<ParamType> = [];
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let dynamic: Array<boolean> = [];
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eventFragment.inputs.forEach((param, index) => {
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if (param.indexed) {
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if (param.type === "string" || param.type === "bytes" || param.baseType === "tuple" || param.baseType === "array") {
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indexed.push(ParamType.fromObject({ type: "bytes32", name: param.name }));
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dynamic.push(true);
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} else {
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indexed.push(param);
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dynamic.push(false);
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}
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} else {
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nonIndexed.push(param);
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dynamic.push(false);
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}
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});
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let resultIndexed = (topics != null) ? this._abiCoder.decode(indexed, concat(topics)): null;
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let resultNonIndexed = this._abiCoder.decode(nonIndexed, data);
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let result: Array<any> = [ ];
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let nonIndexedIndex = 0, indexedIndex = 0;
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eventFragment.inputs.forEach((param, index) => {
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if (param.indexed) {
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if (resultIndexed == null) {
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result[index] = new Indexed({ _isIndexed: true, hash: null });
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} else if (dynamic[index]) {
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result[index] = new Indexed({ _isIndexed: true, hash: 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 (param.name && result[param.name] == null) { result[param.name] = result[index]; }
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});
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return result;
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}
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parseTransaction(tx: { data: string, value?: BigNumberish }): TransactionDescription {
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let fragment = this.getFunction(tx.data.substring(0, 10).toLowerCase())
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if (!fragment) { return null; }
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return new TransactionDescription({
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args: this._abiCoder.decode(fragment.inputs, "0x" + tx.data.substring(10)),
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functionFragment: fragment,
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name: fragment.name,
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signature: fragment.format(),
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sighash: this.getSighash(fragment),
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value: BigNumber.from(tx.value || "0"),
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});
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}
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parseLog(log: { topics: Array<string>, data: string}): LogDescription {
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let fragment = this.getEvent(log.topics[0]);
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if (!fragment || fragment.anonymous) { return null; }
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// @TODO: If anonymous, and the only method, and the input count matches, should we parse?
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return new LogDescription({
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eventFragment: fragment,
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name: fragment.name,
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signature: fragment.format(),
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topic: this.getEventTopic(fragment),
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values: this.decodeEventLog(fragment, log.data, log.topics)
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});
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}
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/*
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static from(value: Array<Fragment | string | JsonAbi> | string | Interface) {
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if (Interface.isInterface(value)) {
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return value;
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}
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if (typeof(value) === "string") {
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return new Interface(JSON.parse(value));
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}
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return new Interface(value);
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}
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*/
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static isInterface(value: any): value is Interface {
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return !!(value && value._isInterface);
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}
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}
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function getFragment(hash: string, calcFunc: (f: Fragment) => string, items: { [ sig: string ]: Fragment } ) {
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for (let signature in items) {
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if (signature.indexOf("(") === -1) { continue; }
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let fragment = items[signature];
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if (calcFunc(fragment) === hash) { return fragment; }
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}
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return null;
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}
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function getNameCount(fragments: { [ signature: string ]: Fragment }): { [ name: string ]: number } {
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let unique: { [ name: string ]: number } = { };
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// Count each name
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for (let signature in fragments) {
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let name = fragments[signature].name;
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if (!unique[name]) { unique[name] = 0; }
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unique[name]++;
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}
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return unique;
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}
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