Session cookie refresh

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#2,349 4 comments 7 reactions 0 assignees View on GitHub

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
25/100
Issue type
Feature
Clarity
Needs clarification
Activity status
Stale
Tech stack
firebase, google-cloud, javascript, next.js
Domain
authentication, backend

Research direction

The only entry point described is the proposed refresh endpoint, which reads a session cookie or request-body value and creates a new session cookie. Review the Firebase Auth session-cookie flow and the endpoint's security implications first; the issue is done only when a supported, clearly safe refresh approach and its expected behavior are established.

Written by the indexing model from the issue text.

Description

needs-triage type: feature request

Hello I'm using Firebase Auth (actually gcp identity platform) with the session cookie in a NextJS app, everything is working fine but I'm looking a way to refresh the cookie to avoid forcing the user to login again when the session expire. There isn't an official way to do that but I might have found a solution, I'm just not 100% sure this is secure enough or if there are issues I'm missing, the idea is to have a refresh endpoint with this code:

    const idToken = req.cookies.session || req.body.sessionCookie;
    const session = await auth().verifySessionCookie(idToken, true);

    if (session) {
      const customToken = await auth().createCustomToken(session.uid);

      const response = await fetch(
        `${GOOGLE_API}:signInWithCustomToken?key=${process.env.NEXT_PUBLIC_API_KEY}`,
        {
          method: "POST",
          cache: "no-cache",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({ token: customToken, returnSecureToken: true }),
        },
      );

      const result = await response.json();
      const sessionCookie = await auth().createSessionCookie(result.idToken, {
        expiresIn,
      });

      setCookie(res, "session", sessionCookie, {
        ...cookieOptions,
        maxAge: expiresIn,
      });

      return res.json({ session, customToken, sessionCookie });
    }

then every time I want I can call this refresh endpoint and the session will be updated...it seems to work but I'd like to have some feedback on this.

Dominant language
TypeScript
Stars
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Forks
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Avg merge
3d 10h
Merged PRs (30d)
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