gristlabs_grist-core/app/server/lib/Sessions.ts

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import {ScopedSession} from 'app/server/lib/BrowserSession';
import {cookieName, SessionStore} from 'app/server/lib/gristSessions';
import * as cookie from 'cookie';
import * as cookieParser from 'cookie-parser';
import {Request} from 'express';
/**
*
* A collection of all the sessions relevant to this instance of Grist.
*
* This collection was previously maintained by the Comm object. This
* class is added as a stepping stone to disentangling session management
* from code related to websockets.
*
* The collection caches all existing interfaces to sessions.
* ScopedSessions play an important role in
* hosted Grist and address per-organization scoping of identity.
*
* TODO: now this is separated out, we could refactor to share sessions
* across organizations. Currently, when a user moves between organizations,
* the session interfaces are not shared. This was for simplicity in working
* with existing code.
*
*/
export class Sessions {
private _sessions = new Map<string, ScopedSession>();
constructor(private _sessionSecret: string, private _sessionStore: SessionStore) {
}
/**
* Get the session id and organization from the request (or just pass it in if known), and
* return the identified session.
*/
public getOrCreateSessionFromRequest(req: Request, sessionId?: string): ScopedSession {
const sid = sessionId || this.getSessionIdFromRequest(req);
const org = (req as any).org;
if (!sid) { throw new Error("session not found"); }
return this.getOrCreateSession(sid, org, ''); // TODO: allow for tying to a preferred user.
}
/**
* Get or create a session given the session id and organization name.
*/
public getOrCreateSession(sid: string, domain: string, userSelector: string): ScopedSession {
const key = this._getSessionOrgKey(sid, domain, userSelector);
if (!this._sessions.has(key)) {
const scopedSession = new ScopedSession(sid, this._sessionStore, domain, userSelector);
this._sessions.set(key, scopedSession);
}
return this._sessions.get(key)!;
}
/**
* Returns the sessionId from the signed grist cookie.
*/
public getSessionIdFromCookie(gristCookie: string) {
return cookieParser.signedCookie(gristCookie, this._sessionSecret);
}
/**
* Get the session id from the grist cookie. Returns null if no cookie found.
*/
public getSessionIdFromRequest(req: Request): string|null {
if (req.headers.cookie) {
const cookies = cookie.parse(req.headers.cookie);
const sessionId = this.getSessionIdFromCookie(cookies[cookieName]);
return sessionId;
}
return null;
}
/**
* Get a per-organization, per-session key.
* Grist has historically cached sessions in memory by their session id.
* With the introduction of per-organization identity, that cache is now
* needs to be keyed by the session id and organization name.
* Also, clients may now want to be tied to a particular user available within
* a session, so we add that into key too.
*/
private _getSessionOrgKey(sid: string, domain: string, userSelector: string): string {
return `${sid}__${domain}__${userSelector}`;
}
}