import * as session from '@gristlabs/express-session'; import {parseSubdomain} from 'app/common/gristUrls'; import {RequestWithOrg} from 'app/server/lib/extractOrg'; import {GristServer} from 'app/server/lib/GristServer'; import {Sessions} from 'app/server/lib/Sessions'; import {promisifyAll} from 'bluebird'; import * as express from 'express'; import * as path from 'path'; import * as shortUUID from "short-uuid"; export const cookieName = process.env.GRIST_SESSION_COOKIE || 'grist_sid'; export const COOKIE_MAX_AGE = 90 * 24 * 60 * 60 * 1000; // 90 days in milliseconds // RedisStore and SqliteStore are expected to provide a set/get interface for sessions. export interface SessionStore { getAsync(sid: string): Promise; setAsync(sid: string, session: any): Promise; } /** * * A V1 session. A session can be associated with a number of users. * There may be a preferred association between users and organizations: * specifically, if from the url we can tell that we are showing material * for a given organization, we should pick a user that has access to that * organization. * * This interface plays no role at all yet! Working on refactoring existing * sessions step by step to get closer to this. * */ export interface IGristSession { // V1 Hosted Grist - known available users. users: Array<{ userId?: number; }>; // V1 Hosted Grist - known user/org relationships. orgs: Array<{ orgId: number; userId: number; }>; } function createSessionStoreFactory(sessionsDB: string): () => SessionStore { if (process.env.REDIS_URL) { // Note that ./build excludes this module from the electron build. const RedisStore = require('connect-redis')(session); promisifyAll(RedisStore.prototype); return () => new RedisStore({ url: process.env.REDIS_URL, }); } else { const SQLiteStore = require('@gristlabs/connect-sqlite3')(session); promisifyAll(SQLiteStore.prototype); return () => new SQLiteStore({ dir: path.dirname(sessionsDB), db: path.basename(sessionsDB), // SQLiteStore no longer appends a .db suffix. table: 'sessions' }); } } export function getAllowedOrgForSessionID(sessionID: string): {org: string, host: string}|null { if (sessionID.startsWith('c-') && sessionID.includes('@')) { const [, org, host] = sessionID.split('@'); if (!host) { throw new Error('Invalid session ID'); } return {org, host}; } // Otherwise sessions start with 'g-', but we also accept older sessions without a prefix. return null; } /** * Set up Grist Sessions, either in a sqlite db or via redis. * @param instanceRoot: path to storage area in case we need to make a sqlite db. */ export function initGristSessions(instanceRoot: string, server: GristServer) { // TODO: We may need to evaluate the usage of space in the SQLite store grist-sessions.db // since entries are created on the first get request. const sessionsDB: string = path.join(instanceRoot, 'grist-sessions.db'); // The extra step with the creator function is used in server.js to create a new session store // after unpausing the server. const sessionStoreCreator = createSessionStoreFactory(sessionsDB); const sessionStore = sessionStoreCreator(); const adaptDomain = process.env.GRIST_ADAPT_DOMAIN === 'true'; const fixedDomain = process.env.GRIST_SESSION_DOMAIN || process.env.GRIST_DOMAIN; const getCookieDomain = (req: express.Request) => { const mreq = req as RequestWithOrg; if (mreq.isCustomHost) { // For custom hosts, omit the domain to make it a "host-only" cookie, to avoid it being // included into subdomain requests (since we would not control all the subdomains). return undefined; } if (adaptDomain) { const reqDomain = parseSubdomain(req.get('host')); if (reqDomain.base) { return reqDomain.base.split(':')[0]; } } return fixedDomain; }; // Use a separate session IDs for custom domains than for native ones. Because a custom domain // cookie could be stolen (with some effort) by the custom domain's owner, we limit the damage // by only honoring custom-domain cookies for requests to that domain. const generateId = (req: RequestWithOrg) => { const uid = shortUUID.generate(); return req.isCustomHost ? `c-${uid}@${req.org}@${req.get('host')}` : `g-${uid}`; }; const sessionSecret = server.create.sessionSecret(); const sessionMiddleware = session({ secret: sessionSecret, resave: false, saveUninitialized: false, name: cookieName, requestDomain: getCookieDomain, genid: generateId, cookie: { // We do not initially set max-age, leaving the cookie as a // session cookie until there's a successful login. On the // redis back-end, the session associated with the cookie will // persist for 24 hours if there is no successful login. Once // there is a successful login, max-age will be set to // COOKIE_MAX_AGE, making the cookie a persistent cookie. The // session associated with the cookie will receive an updated // time-to-live, so that it persists for COOKIE_MAX_AGE. }, store: sessionStore }); const sessions = new Sessions(sessionSecret, sessionStore, server); return {sessions, sessionSecret, sessionStore, sessionMiddleware, sessionStoreCreator}; }