ethers.js/packages/abi/lib.esm/interface.js

"use strict";
import { getAddress } from "@ethersproject/address";
import { BigNumber } from "@ethersproject/bignumber";
import { arrayify, concat, hexDataSlice, hexlify, hexZeroPad, isHexString } from "@ethersproject/bytes";
import { id } from "@ethersproject/hash";
import { keccak256 } from "@ethersproject/keccak256";
import { defineReadOnly, Description, getStatic } from "@ethersproject/properties";
import { defaultAbiCoder } from "./abi-coder";
import { ConstructorFragment, EventFragment, FormatTypes, Fragment, FunctionFragment, ParamType } from "./fragments";
import { Logger } from "@ethersproject/logger";
import { version } from "./_version";
const logger = new Logger(version);
export class LogDescription extends Description {
}
export class TransactionDescription extends Description {
}
export class Indexed extends Description {
    static isIndexed(value) {
        return !!(value && value._isIndexed);
    }
}
export class Interface {
    constructor(fragments) {
        logger.checkNew(new.target, Interface);
        let abi = [];
        if (typeof (fragments) === "string") {
            abi = JSON.parse(fragments);
        }
        else {
            abi = fragments;
        }
        defineReadOnly(this, "fragments", abi.map((fragment) => {
            return Fragment.from(fragment);
        }).filter((fragment) => (fragment != null)));
        defineReadOnly(this, "_abiCoder", getStatic((new.target), "getAbiCoder")());
        defineReadOnly(this, "functions", {});
        defineReadOnly(this, "errors", {});
        defineReadOnly(this, "events", {});
        defineReadOnly(this, "structs", {});
        // Add all fragments by their signature
        this.fragments.forEach((fragment) => {
            let bucket = null;
            switch (fragment.type) {
                case "constructor":
                    if (this.deploy) {
                        logger.warn("duplicate definition - constructor");
                        return;
                    }
                    defineReadOnly(this, "deploy", fragment);
                    return;
                case "function":
                    bucket = this.functions;
                    break;
                case "event":
                    bucket = this.events;
                    break;
                default:
                    return;
            }
            let signature = fragment.format();
            if (bucket[signature]) {
                logger.warn("duplicate definition - " + signature);
                return;
            }
            bucket[signature] = fragment;
        });
        // If we do not have a constructor use the default "constructor() payable"
        if (!this.deploy) {
            defineReadOnly(this, "deploy", ConstructorFragment.from({ type: "constructor" }));
        }
        defineReadOnly(this, "_isInterface", true);
    }
    format(format) {
        if (!format) {
            format = FormatTypes.full;
        }
        if (format === FormatTypes.sighash) {
            logger.throwArgumentError("interface does not support formating sighash", "format", format);
        }
        const abi = this.fragments.map((fragment) => fragment.format(format));
        // We need to re-bundle the JSON fragments a bit
        if (format === FormatTypes.json) {
            return JSON.stringify(abi.map((j) => JSON.parse(j)));
        }
        return abi;
    }
    // Sub-classes can override these to handle other blockchains
    static getAbiCoder() {
        return defaultAbiCoder;
    }
    static getAddress(address) {
        return getAddress(address);
    }
    static getSighash(functionFragment) {
        return hexDataSlice(id(functionFragment.format()), 0, 4);
    }
    static getTopic(eventFragment) {
        return id(eventFragment.format());
    }
    // Find a function definition by any means necessary (unless it is ambiguous)
    getFunction(nameOrSignatureOrSighash) {
        if (isHexString(nameOrSignatureOrSighash)) {
            for (const name in this.functions) {
                if (nameOrSignatureOrSighash === this.getSighash(name)) {
                    return this.functions[name];
                }
            }
            logger.throwArgumentError("no matching function", "sighash", nameOrSignatureOrSighash);
        }
        // It is a bare name, look up the function (will return null if ambiguous)
        if (nameOrSignatureOrSighash.indexOf("(") === -1) {
            const name = nameOrSignatureOrSighash.trim();
            const matching = Object.keys(this.functions).filter((f) => (f.split("(" /* fix:) */)[0] === name));
            if (matching.length === 0) {
                logger.throwArgumentError("no matching function", "name", name);
            }
            else if (matching.length > 1) {
                logger.throwArgumentError("multiple matching functions", "name", name);
            }
            return this.functions[matching[0]];
        }
        // Normlize the signature and lookup the function
        const result = this.functions[FunctionFragment.fromString(nameOrSignatureOrSighash).format()];
        if (!result) {
            logger.throwArgumentError("no matching function", "signature", nameOrSignatureOrSighash);
        }
        return result;
    }
    // Find an event definition by any means necessary (unless it is ambiguous)
    getEvent(nameOrSignatureOrTopic) {
        if (isHexString(nameOrSignatureOrTopic)) {
            const topichash = nameOrSignatureOrTopic.toLowerCase();
            for (const name in this.events) {
                if (topichash === this.getEventTopic(name)) {
                    return this.events[name];
                }
            }
            logger.throwArgumentError("no matching event", "topichash", topichash);
        }
        // It is a bare name, look up the function (will return null if ambiguous)
        if (nameOrSignatureOrTopic.indexOf("(") === -1) {
            const name = nameOrSignatureOrTopic.trim();
            const matching = Object.keys(this.events).filter((f) => (f.split("(" /* fix:) */)[0] === name));
            if (matching.length === 0) {
                logger.throwArgumentError("no matching event", "name", name);
            }
            else if (matching.length > 1) {
                logger.throwArgumentError("multiple matching events", "name", name);
            }
            return this.events[matching[0]];
        }
        // Normlize the signature and lookup the function
        const result = this.events[EventFragment.fromString(nameOrSignatureOrTopic).format()];
        if (!result) {
            logger.throwArgumentError("no matching event", "signature", nameOrSignatureOrTopic);
        }
        return result;
    }
    // Get the sighash (the bytes4 selector) used by Solidity to identify a function
    getSighash(functionFragment) {
        if (typeof (functionFragment) === "string") {
            functionFragment = this.getFunction(functionFragment);
        }
        return getStatic(this.constructor, "getSighash")(functionFragment);
    }
    // Get the topic (the bytes32 hash) used by Solidity to identify an event
    getEventTopic(eventFragment) {
        if (typeof (eventFragment) === "string") {
            eventFragment = this.getEvent(eventFragment);
        }
        return getStatic(this.constructor, "getTopic")(eventFragment);
    }
    _decodeParams(params, data) {
        return this._abiCoder.decode(params, data);
    }
    _encodeParams(params, values) {
        return this._abiCoder.encode(params, values);
    }
    encodeDeploy(values) {
        return this._encodeParams(this.deploy.inputs, values || []);
    }
    // Decode the data for a function call (e.g. tx.data)
    decodeFunctionData(functionFragment, data) {
        if (typeof (functionFragment) === "string") {
            functionFragment = this.getFunction(functionFragment);
        }
        const bytes = arrayify(data);
        if (hexlify(bytes.slice(0, 4)) !== this.getSighash(functionFragment)) {
            logger.throwArgumentError(`data signature does not match function ${functionFragment.name}.`, "data", hexlify(bytes));
        }
        return this._decodeParams(functionFragment.inputs, bytes.slice(4));
    }
    // Encode the data for a function call (e.g. tx.data)
    encodeFunctionData(functionFragment, values) {
        if (typeof (functionFragment) === "string") {
            functionFragment = this.getFunction(functionFragment);
        }
        return hexlify(concat([
            this.getSighash(functionFragment),
            this._encodeParams(functionFragment.inputs, values || [])
        ]));
    }
    // Decode the result from a function call (e.g. from eth_call)
    decodeFunctionResult(functionFragment, data) {
        if (typeof (functionFragment) === "string") {
            functionFragment = this.getFunction(functionFragment);
        }
        let bytes = arrayify(data);
        let reason = null;
        let errorSignature = null;
        switch (bytes.length % this._abiCoder._getWordSize()) {
            case 0:
                try {
                    return this._abiCoder.decode(functionFragment.outputs, bytes);
                }
                catch (error) { }
                break;
            case 4:
                if (hexlify(bytes.slice(0, 4)) === "0x08c379a0") {
                    errorSignature = "Error(string)";
                    reason = this._abiCoder.decode(["string"], bytes.slice(4))[0];
                }
                break;
        }
        return logger.throwError("call revert exception", Logger.errors.CALL_EXCEPTION, {
            method: functionFragment.format(),
            errorSignature: errorSignature,
            errorArgs: [reason],
            reason: reason
        });
    }
    // Encode the result for a function call (e.g. for eth_call)
    encodeFunctionResult(functionFragment, values) {
        if (typeof (functionFragment) === "string") {
            functionFragment = this.getFunction(functionFragment);
        }
        return hexlify(this._abiCoder.encode(functionFragment.outputs, values || []));
    }
    // Create the filter for the event with search criteria (e.g. for eth_filterLog)
    encodeFilterTopics(eventFragment, values) {
        if (typeof (eventFragment) === "string") {
            eventFragment = this.getEvent(eventFragment);
        }
        if (values.length > eventFragment.inputs.length) {
            logger.throwError("too many arguments for " + eventFragment.format(), Logger.errors.UNEXPECTED_ARGUMENT, {
                argument: "values",
                value: values
            });
        }
        let topics = [];
        if (!eventFragment.anonymous) {
            topics.push(this.getEventTopic(eventFragment));
        }
        values.forEach((value, index) => {
            let param = eventFragment.inputs[index];
            if (!param.indexed) {
                if (value != null) {
                    logger.throwArgumentError("cannot filter non-indexed parameters; must be null", ("contract." + param.name), value);
                }
                return;
            }
            if (value == null) {
                topics.push(null);
            }
            else if (param.type === "string") {
                topics.push(id(value));
            }
            else if (param.type === "bytes") {
                topics.push(keccak256(hexlify(value)));
            }
            else if (param.type.indexOf("[") !== -1 || param.type.substring(0, 5) === "tuple") {
                logger.throwArgumentError("filtering with tuples or arrays not supported", ("contract." + param.name), value);
            }
            else {
                // Check addresses are valid
                if (param.type === "address") {
                    this._abiCoder.encode(["address"], [value]);
                }
                topics.push(hexZeroPad(hexlify(value), 32));
            }
        });
        // Trim off trailing nulls
        while (topics.length && topics[topics.length - 1] === null) {
            topics.pop();
        }
        return topics;
    }
    // Decode a filter for the event and the search criteria
    decodeEventLog(eventFragment, data, topics) {
        if (typeof (eventFragment) === "string") {
            eventFragment = this.getEvent(eventFragment);
        }
        if (topics != null && !eventFragment.anonymous) {
            let topicHash = this.getEventTopic(eventFragment);
            if (!isHexString(topics[0], 32) || topics[0].toLowerCase() !== topicHash) {
                logger.throwError("fragment/topic mismatch", Logger.errors.INVALID_ARGUMENT, { argument: "topics[0]", expected: topicHash, value: topics[0] });
            }
            topics = topics.slice(1);
        }
        let indexed = [];
        let nonIndexed = [];
        let dynamic = [];
        eventFragment.inputs.forEach((param, index) => {
            if (param.indexed) {
                if (param.type === "string" || param.type === "bytes" || param.baseType === "tuple" || param.baseType === "array") {
                    indexed.push(ParamType.fromObject({ type: "bytes32", name: param.name }));
                    dynamic.push(true);
                }
                else {
                    indexed.push(param);
                    dynamic.push(false);
                }
            }
            else {
                nonIndexed.push(param);
                dynamic.push(false);
            }
        });
        let resultIndexed = (topics != null) ? this._abiCoder.decode(indexed, concat(topics)) : null;
        let resultNonIndexed = this._abiCoder.decode(nonIndexed, data);
        let result = [];
        let nonIndexedIndex = 0, indexedIndex = 0;
        eventFragment.inputs.forEach((param, index) => {
            if (param.indexed) {
                if (resultIndexed == null) {
                    result[index] = new Indexed({ _isIndexed: true, hash: null });
                }
                else if (dynamic[index]) {
                    result[index] = new Indexed({ _isIndexed: true, hash: resultIndexed[indexedIndex++] });
                }
                else {
                    result[index] = resultIndexed[indexedIndex++];
                }
            }
            else {
                result[index] = resultNonIndexed[nonIndexedIndex++];
            }
            if (param.name && result[param.name] == null) {
                result[param.name] = result[index];
            }
        });
        return result;
    }
    // Given a transaction, find the matching function fragment (if any) and
    // determine all its properties and call parameters
    parseTransaction(tx) {
        let fragment = this.getFunction(tx.data.substring(0, 10).toLowerCase());
        if (!fragment) {
            return null;
        }
        return new TransactionDescription({
            args: this._abiCoder.decode(fragment.inputs, "0x" + tx.data.substring(10)),
            functionFragment: fragment,
            name: fragment.name,
            signature: fragment.format(),
            sighash: this.getSighash(fragment),
            value: BigNumber.from(tx.value || "0"),
        });
    }
    // Given an event log, find the matching event fragment (if any) and
    // determine all its properties and values
    parseLog(log) {
        let fragment = this.getEvent(log.topics[0]);
        if (!fragment || fragment.anonymous) {
            return null;
        }
        // @TODO: If anonymous, and the only method, and the input count matches, should we parse?
        //        Probably not, because just because it is the only event in the ABI does
        //        not mean we have the full ABI; maybe jsut a fragment?
        return new LogDescription({
            eventFragment: fragment,
            name: fragment.name,
            signature: fragment.format(),
            topic: this.getEventTopic(fragment),
            args: this.decodeEventLog(fragment, log.data, log.topics)
        });
    }
    /*
    static from(value: Array<Fragment | string | JsonAbi> | string | Interface) {
        if (Interface.isInterface(value)) {
            return value;
        }
        if (typeof(value) === "string") {
            return new Interface(JSON.parse(value));
        }
        return new Interface(value);
    }
    */
    static isInterface(value) {
        return !!(value && value._isInterface);
    }
}