@lit-protocol/auth-helpers/src/lib/utils.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.formatPKPResource = formatPKPResource;
/**
 * Formats the resource ID to a 32-byte hex string.
 *
 * - Takes out '0x' and makes the string 64 characters long.
 * - Adds zeros to make short strings 64 characters.
 * - Doesn't change valid 64-character hex strings.
 * - Returns '*' as is.
 * - Returns the original if it has bad hex characters.
 * - Doesn't change 64-character strings.
 * - Adds zeros to make short hex strings 64 characters.
 * - Returns the original if it partly matches hex.
 * - Throws an error if the string is too long.
 *
 * @param resource The identifier for the resource. This should be the PKP token ID.
 * @returns A 32-byte hex string representing the resource ID.
 * @throws Will throw an error if the input exceeds 64 characters.
 */
function formatPKPResource(resource) {
    // Remove the '0x' prefix if present
    let fixedResource = resource.startsWith('0x') ? resource.slice(2) : resource;
    // Throw an error if the resource length exceeds 64 characters
    if (fixedResource.length > 64) {
        throw new Error('Resource ID exceeds 64 characters (32 bytes) in length.');
    }
    /**
     * The pattern matches any sequence of 6 characters that are
     * either digits (0-9) or letters A-F (both uppercase and lowercase).
     */
    const hexRegex = /^[0-9A-Fa-f]+$/;
    // Ensure the resource is a valid hex string and not a wildcard '*'
    if (fixedResource !== '*' && hexRegex.test(fixedResource)) {
        // Pad the resource ID with leading zeros to make it 32 bytes (64 hex characters)
        fixedResource = fixedResource.padStart(64, '0');
    }
    return fixedResource;
}
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