@guardian/pan-domain-node/dist/src/panda.js

NodeJs implementation of Guardian pan-domain auth verification

"use strict";
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    Object.defineProperty(o, "default", { enumerable: true, value: v });
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    o["default"] = v;
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var __importStar = (this && this.__importStar) || (function () {
    var ownKeys = function(o) {
        ownKeys = Object.getOwnPropertyNames || function (o) {
            var ar = [];
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})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.PanDomainAuthentication = void 0;
exports.createCookie = createCookie;
exports.verifyUser = verifyUser;
const cookie = __importStar(require("cookie"));
const utils_1 = require("./utils");
const api_1 = require("./api");
const fetch_public_key_1 = require("./fetch-public-key");
const client_s3_1 = require("@aws-sdk/client-s3");
const credential_providers_1 = require("@aws-sdk/credential-providers");
function createCookie(user, privateKey) {
    let queryParams = [];
    queryParams.push("firstName=" + user.firstName);
    queryParams.push("lastName=" + user.lastName);
    queryParams.push("email=" + user.email);
    user.avatarUrl && queryParams.push("avatarUrl=" + user.avatarUrl);
    queryParams.push("system=" + user.authenticatingSystem);
    queryParams.push("authedIn=" + user.authenticatedIn.join(","));
    queryParams.push("expires=" + user.expires.toString());
    queryParams.push("multifactor=" + String(user.multifactor));
    const combined = queryParams.join("&");
    const queryParamsString = Buffer.from(combined).toString('base64');
    const signature = (0, utils_1.sign)(combined, privateKey);
    return queryParamsString + "." + signature;
}
function verifyUser(pandaCookie, publicKey, currentTime, validateUser) {
    if (!pandaCookie) {
        return {
            success: false,
            reason: 'no-cookie'
        };
    }
    const parsedCookie = (0, utils_1.parseCookie)(pandaCookie);
    if (!parsedCookie) {
        return {
            success: false,
            reason: 'invalid-cookie'
        };
    }
    const { data, signature } = parsedCookie;
    if (!(0, utils_1.verifySignature)(data, signature, publicKey)) {
        return {
            success: false,
            reason: 'invalid-cookie'
        };
    }
    const currentTimestampInMillis = currentTime.getTime();
    try {
        const user = (0, utils_1.parseUser)(data);
        const isExpired = user.expires < currentTimestampInMillis;
        if (isExpired) {
            const gracePeriodEndsAtEpochTimeMillis = user.expires + api_1.gracePeriodInMillis;
            if (gracePeriodEndsAtEpochTimeMillis < currentTimestampInMillis) {
                return {
                    success: false,
                    reason: 'expired-cookie'
                };
            }
            else {
                return {
                    success: true,
                    shouldRefreshCredentials: true,
                    mustRefreshByEpochTimeMillis: gracePeriodEndsAtEpochTimeMillis,
                    user
                };
            }
        }
        if (!validateUser(user)) {
            return {
                success: false,
                reason: 'invalid-user',
                user
            };
        }
        return {
            success: true,
            shouldRefreshCredentials: false,
            user
        };
    }
    catch (error) {
        console.error(error);
        return {
            success: false,
            reason: 'unknown'
        };
    }
}
class PanDomainAuthentication {
    constructor(cookieName, region, bucket, keyFile, validateUser, credentialsProvider = (0, credential_providers_1.fromNodeProviderChain)()) {
        this.keyCacheTimeInMillis = 60 * 1000; // 1 minute
        this.cookieName = cookieName;
        this.region = region;
        this.bucket = bucket;
        this.keyFile = keyFile;
        this.validateUser = validateUser;
        const standardAwsConfig = {
            region: region,
            credentials: credentialsProvider,
        };
        this.s3Client = new client_s3_1.S3(standardAwsConfig);
        this.publicKey = (0, fetch_public_key_1.fetchPublicKey)(this.s3Client, bucket, keyFile);
        this.keyUpdateTimer = setInterval(() => this.getPublicKey(), this.keyCacheTimeInMillis);
    }
    stop() {
        if (this.keyUpdateTimer) {
            clearInterval(this.keyUpdateTimer);
            this.keyUpdateTimer = undefined;
        }
    }
    getPublicKey() {
        return this.publicKey.then(({ key, lastUpdated }) => {
            const now = new Date();
            const diff = now.getTime() - lastUpdated.getTime();
            if (diff > this.keyCacheTimeInMillis) {
                this.publicKey = (0, fetch_public_key_1.fetchPublicKey)(this.s3Client, this.bucket, this.keyFile);
                return this.publicKey.then(({ key }) => key);
            }
            else {
                return key;
            }
        });
    }
    verify(requestCookies) {
        return this.getPublicKey().then(publicKey => {
            const cookies = cookie.parse(requestCookies !== null && requestCookies !== void 0 ? requestCookies : '');
            const pandaCookie = cookies[this.cookieName];
            return verifyUser(pandaCookie, publicKey, new Date(), this.validateUser);
        });
    }
}
exports.PanDomainAuthentication = PanDomainAuthentication;