ethers.js/packages/abstract-signer/lib.esm/index.js

"use strict";
import { defineReadOnly, resolveProperties, shallowCopy } from "@ethersproject/properties";
import { Logger } from "@ethersproject/logger";
import { version } from "./_version";
const logger = new Logger(version);
const allowedTransactionKeys = [
    "chainId", "data", "from", "gasLimit", "gasPrice", "nonce", "to", "value"
];
// Sub-Class Notes:
//  - A Signer MUST always make sure, that if present, the "from" field
//    matches the Signer, before sending or signing a transaction
//  - A Signer SHOULD always wrap private information (such as a private
//    key or mnemonic) in a function, so that console.log does not leak
//    the data
export class Signer {
    ///////////////////
    // Sub-classes MUST call super
    constructor() {
        logger.checkAbstract(new.target, Signer);
        defineReadOnly(this, "_isSigner", true);
    }
    ///////////////////
    // Sub-classes MAY override these
    getBalance(blockTag) {
        this._checkProvider("getBalance");
        return this.provider.getBalance(this.getAddress(), blockTag);
    }
    getTransactionCount(blockTag) {
        this._checkProvider("getTransactionCount");
        return this.provider.getTransactionCount(this.getAddress(), blockTag);
    }
    // Populates "from" if unspecified, and estimates the gas for the transation
    estimateGas(transaction) {
        this._checkProvider("estimateGas");
        return resolveProperties(this.checkTransaction(transaction)).then((tx) => {
            return this.provider.estimateGas(tx);
        });
    }
    // Populates "from" if unspecified, and calls with the transation
    call(transaction, blockTag) {
        this._checkProvider("call");
        return resolveProperties(this.checkTransaction(transaction)).then((tx) => {
            return this.provider.call(tx);
        });
    }
    // Populates all fields in a transaction, signs it and sends it to the network
    sendTransaction(transaction) {
        this._checkProvider("sendTransaction");
        return this.populateTransaction(transaction).then((tx) => {
            return this.signTransaction(tx).then((signedTx) => {
                return this.provider.sendTransaction(signedTx);
            });
        });
    }
    getChainId() {
        this._checkProvider("getChainId");
        return this.provider.getNetwork().then((network) => network.chainId);
    }
    getGasPrice() {
        this._checkProvider("getGasPrice");
        return this.provider.getGasPrice();
    }
    resolveName(name) {
        this._checkProvider("resolveName");
        return this.provider.resolveName(name);
    }
    // Checks a transaction does not contain invalid keys and if
    // no "from" is provided, populates it.
    // - does NOT require a provider
    // - adds "from" is not present
    // - returns a COPY (safe to mutate the result)
    // By default called from: (overriding these prevents it)
    //   - call
    //   - estimateGas
    //   - populateTransaction (and therefor sendTransaction)
    checkTransaction(transaction) {
        for (let key in transaction) {
            if (allowedTransactionKeys.indexOf(key) === -1) {
                logger.throwArgumentError("invalid transaction key: " + key, "transaction", transaction);
            }
        }
        let tx = shallowCopy(transaction);
        if (tx.from == null) {
            tx.from = this.getAddress();
        }
        return tx;
    }
    // Populates ALL keys for a transaction and checks that "from" matches
    // this Signer. Should be used by sendTransaction but NOT by signTransaction.
    // By default called from: (overriding these prevents it)
    //   - sendTransaction
    populateTransaction(transaction) {
        return resolveProperties(this.checkTransaction(transaction)).then((tx) => {
            if (tx.to != null) {
                tx.to = Promise.resolve(tx.to).then((to) => this.resolveName(to));
            }
            if (tx.gasPrice == null) {
                tx.gasPrice = this.getGasPrice();
            }
            if (tx.nonce == null) {
                tx.nonce = this.getTransactionCount("pending");
            }
            // Make sure any provided address matches this signer
            if (tx.from == null) {
                tx.from = this.getAddress();
            }
            else {
                tx.from = Promise.all([
                    this.getAddress(),
                    this.provider.resolveName(tx.from)
                ]).then((results) => {
                    if (results[0] !== results[1]) {
                        logger.throwArgumentError("from address mismatch", "transaction", transaction);
                    }
                    return results[0];
                });
            }
            if (tx.gasLimit == null) {
                tx.gasLimit = this.estimateGas(tx).catch((error) => {
                    logger.throwError("cannot estimate gas; transaction may fail or may require manual gas limit", Logger.errors.UNPREDICTABLE_GAS_LIMIT, {
                        tx: tx
                    });
                });
            }
            if (tx.chainId == null) {
                tx.chainId = this.getChainId();
            }
            return resolveProperties(tx);
        });
    }
    ///////////////////
    // Sub-classes SHOULD leave these alone
    _checkProvider(operation) {
        if (!this.provider) {
            logger.throwError("missing provider", Logger.errors.UNSUPPORTED_OPERATION, {
                operation: (operation || "_checkProvider")
            });
        }
    }
    static isSigner(value) {
        return !!(value && value._isSigner);
    }
}
export class VoidSigner extends Signer {
    constructor(address, provider) {
        logger.checkNew(new.target, VoidSigner);
        super();
        defineReadOnly(this, "address", address);
        defineReadOnly(this, "provider", provider || null);
    }
    getAddress() {
        return Promise.resolve(this.address);
    }
    _fail(message, operation) {
        return Promise.resolve().then(() => {
            logger.throwError(message, Logger.errors.UNSUPPORTED_OPERATION, { operation: operation });
        });
    }
    signMessage(message) {
        return this._fail("VoidSigner cannot sign messages", "signMessage");
    }
    signTransaction(transaction) {
        return this._fail("VoidSigner cannot sign transactions", "signTransaction");
    }
    connect(provider) {
        return new VoidSigner(this.address, provider);
    }
}