@lit-protocol/auth-helpers/src/lib/generate-auth-sig.js

Advanced authentication utilities for managing blockchain resource permissions and capabilities within the Lit Protocol ecosystem. Built on top of SIWE (Sign-In with Ethereum) and SIWE-RECAP for robust authentication flows.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.generateAuthSig = void 0;
const ethers_1 = require("ethers");
/**
 * Generate an AuthSig object using the signer.
 *
 * For more context:
 * We are only using authSig to generate session sigs. In a newer version, we will stop accepting
 * authSig all together from the node and will only accept session sigs. The address being
 * used here will be checksummed.
 *
 * @param signer the signer must have a "signMessage" method
 * @param toSign - the message to sign
 * @param address - (optional) the address of the signer
 * @returns
 */
const generateAuthSig = async ({ signer, toSign, address, algo, }) => {
    if (!signer?.signMessage) {
        throw new Error('signer does not have a signMessage method');
    }
    const signature = await signer.signMessage(toSign);
    // If address is not provided, derive it from the signer
    if (!address) {
        address = await signer.getAddress();
    }
    // checksum the address
    address = ethers_1.ethers.utils.getAddress(address);
    // If address is still not available, throw an error
    if (!address) {
        throw new Error('address is required');
    }
    return {
        sig: signature,
        derivedVia: 'web3.eth.personal.sign',
        signedMessage: toSign,
        address: address,
        ...(algo && { algo }),
    };
};
exports.generateAuthSig = generateAuthSig;
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