@rsksmart/express-did-auth/lib/classes/challenge-verifier.js

Authentication with Verifiable Credentials for Express.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.ChallengeVerifier = void 0;
const errors_1 = require("../errors");
const js_sha3_1 = require("js-sha3");
const defaults_1 = require("../defaults");
class ChallengeVerifier {
    constructor({ challengeExpirationTime, challengeSecret }) {
        this.expirationTime = challengeExpirationTime || defaults_1.CHALLENGE_EXPIRATION_TIME;
        this.secret = challengeSecret;
    }
    get(did) {
        if (!did)
            throw new Error(errors_1.INVALID_DID);
        return this.calculateChallenge(did);
    }
    verify(did, challenge) {
        if (!did)
            throw new Error(errors_1.INVALID_DID);
        const expected = this.calculateChallenge(did);
        if (expected !== challenge)
            return false;
        return true;
    }
    calculateChallenge(did) {
        const timestamp = Math.floor(Date.now() / this.expirationTime);
        return js_sha3_1.keccak256(`${did}-${this.secret}-${timestamp}`);
    }
}
exports.ChallengeVerifier = ChallengeVerifier;
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