482 lines
18 KiB
TypeScript
482 lines
18 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 { Result } from "./coders/abstract-coder";
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import { ConstructorFragment, EventFragment, FormatTypes, 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 { Result };
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export class LogDescription extends Description<LogDescription> {
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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 args: Result
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}
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export class TransactionDescription extends Description<TransactionDescription> {
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readonly functionFragment: FunctionFragment;
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readonly name: string;
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readonly args: Result;
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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<Indexed> {
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readonly hash: string;
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readonly _isIndexed: boolean;
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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 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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readonly _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", <ConstructorFragment>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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// 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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format(format?: string): string | Array<string> {
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if (!format) { format = FormatTypes.full; }
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if (format === FormatTypes.sighash) {
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logger.throwArgumentError("interface does not support formatting sighash", "format", format);
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}
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const abi = this.fragments.map((fragment) => fragment.format(format));
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// We need to re-bundle the JSON fragments a bit
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if (format === FormatTypes.json) {
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return JSON.stringify(abi.map((j) => JSON.parse(j)));
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}
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return abi;
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}
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// Sub-classes can override these to handle other blockchains
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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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static getSighash(functionFragment: FunctionFragment): string {
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return hexDataSlice(id(functionFragment.format()), 0, 4);
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}
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static getEventTopic(eventFragment: EventFragment): string {
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return id(eventFragment.format());
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}
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// Find a function definition by any means necessary (unless it is ambiguous)
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getFunction(nameOrSignatureOrSighash: string): FunctionFragment {
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if (isHexString(nameOrSignatureOrSighash)) {
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for (const name in this.functions) {
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if (nameOrSignatureOrSighash === this.getSighash(name)) {
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return this.functions[name];
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}
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}
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logger.throwArgumentError("no matching function", "sighash", nameOrSignatureOrSighash);
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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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const name = nameOrSignatureOrSighash.trim();
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const matching = Object.keys(this.functions).filter((f) => (f.split("("/* fix:) */)[0] === name));
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if (matching.length === 0) {
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logger.throwArgumentError("no matching function", "name", name);
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} else if (matching.length > 1) {
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logger.throwArgumentError("multiple matching functions", "name", name);
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}
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return this.functions[matching[0]];
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}
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// Normlize the signature and lookup the function
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const result = this.functions[FunctionFragment.fromString(nameOrSignatureOrSighash).format()];
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if (!result) {
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logger.throwArgumentError("no matching function", "signature", nameOrSignatureOrSighash);
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}
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return result;
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}
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// Find an event definition by any means necessary (unless it is ambiguous)
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getEvent(nameOrSignatureOrTopic: string): EventFragment {
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if (isHexString(nameOrSignatureOrTopic)) {
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const topichash = nameOrSignatureOrTopic.toLowerCase();
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for (const name in this.events) {
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if (topichash === this.getEventTopic(name)) {
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return this.events[name];
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}
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}
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logger.throwArgumentError("no matching event", "topichash", topichash);
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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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const name = nameOrSignatureOrTopic.trim();
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const matching = Object.keys(this.events).filter((f) => (f.split("("/* fix:) */)[0] === name));
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if (matching.length === 0) {
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logger.throwArgumentError("no matching event", "name", name);
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} else if (matching.length > 1) {
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logger.throwArgumentError("multiple matching events", "name", name);
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}
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return this.events[matching[0]];
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}
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// Normlize the signature and lookup the function
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const result = this.events[EventFragment.fromString(nameOrSignatureOrTopic).format()];
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if (!result) {
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logger.throwArgumentError("no matching event", "signature", nameOrSignatureOrTopic);
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}
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return result;
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}
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// Get the sighash (the bytes4 selector) used by Solidity to identify a function
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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 getStatic<(f: FunctionFragment) => string>(this.constructor, "getSighash")(functionFragment);
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}
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// Get the topic (the bytes32 hash) used by Solidity to identify an event
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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 getStatic<(e: EventFragment) => string>(this.constructor, "getEventTopic")(eventFragment);
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}
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_decodeParams(params: Array<ParamType>, data: BytesLike): Result {
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return this._abiCoder.decode(params, data)
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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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// Decode the data for a function call (e.g. tx.data)
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decodeFunctionData(functionFragment: FunctionFragment | string, data: BytesLike): Result {
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if (typeof(functionFragment) === "string") {
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functionFragment = this.getFunction(functionFragment);
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}
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const bytes = arrayify(data);
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if (hexlify(bytes.slice(0, 4)) !== this.getSighash(functionFragment)) {
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logger.throwArgumentError(`data signature does not match function ${ functionFragment.name }.`, "data", hexlify(bytes));
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}
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return this._decodeParams(functionFragment.inputs, bytes.slice(4));
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}
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// Encode the data for a function call (e.g. tx.data)
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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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// Decode the result from a function call (e.g. from eth_call)
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decodeFunctionResult(functionFragment: FunctionFragment | string, data: BytesLike): Result {
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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))[0];
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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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// Encode the result for a function call (e.g. for eth_call)
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encodeFunctionResult(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(this._abiCoder.encode(functionFragment.outputs, values || [ ]));
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}
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// Create the filter for the event with search criteria (e.g. for eth_filterLog)
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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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// Decode a filter for the event and the search criteria
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decodeEventLog(eventFragment: EventFragment | string, data: BytesLike, topics?: Array<string>): Result {
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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> & { [ key: string ]: 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 Object.freeze(result);
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}
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// Given a transaction, find the matching function fragment (if any) and
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// determine all its properties and call parameters
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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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// Given an event log, find the matching event fragment (if any) and
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// determine all its properties and values
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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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// Probably not, because just because it is the only event in the ABI does
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// not mean we have the full ABI; maybe jsut a fragment?
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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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args: 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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