Implementing multi-provider OAuth 2.0 in a Firebase app: Storing access tokens for Gmail, Outlook, and Slack

Hey everyone! I’m building a web app where users sign in with Firebase. Now I want them to connect their Gmail, Outlook, and Slack accounts so my app can read their stuff. I’ve tried using Auth.js for Gmail and Outlook OAuth, but I’m stuck on saving multiple tokens.

I need help figuring out:

  1. What’s the best way to do OAuth 2.0 in a Firebase app when you need tokens for different services?
  2. How do I save all the tokens safely so I can use them later?
  3. Are there any good libraries or tips for handling OAuth with multiple providers?

I’m pretty new to this OAuth thing, so any advice would be awesome! Thanks!

I’ve dealt with similar challenges in my projects. One approach that worked well was using Firebase Custom Authentication combined with service-specific OAuth libraries. For Gmail and Outlook, the Google and Microsoft Graph SDKs are solid choices. Slack has its own OAuth library too.

For token storage, I found encrypting them before saving to Firestore to be crucial. You can use Firebase’s built-in encryption methods or a third-party library like ‘crypto-js’ for added security.

A tip from experience: implement token refresh logic early on. It’ll save you headaches later when dealing with expired tokens.

As for libraries, I’ve had success with ‘simple-oauth2’ for handling multiple providers. It’s flexible and well-documented.

Remember to thoroughly test your OAuth flows, especially edge cases like connection drops during authorization. It’ll make your app much more robust.

For implementing multi-provider OAuth in a Firebase app, I’d recommend using Firebase Custom Authentication in conjunction with the official SDKs for each service (Gmail, Outlook, Slack). This approach allows for more flexibility and control.

To securely store access tokens, encrypt them before saving to Firestore or Firebase Realtime Database. Use Firebase Security Rules to restrict access to only the authenticated user.

Consider implementing a token refresh mechanism to handle expired tokens automatically. This can be done using Cloud Functions or within your app logic.

For simplifying OAuth flows, the ‘google-auth-library’ for Node.js is quite robust and supports multiple providers. It can streamline the process of obtaining and refreshing tokens.

Remember to handle error cases and provide clear user feedback during the OAuth process.

hey there! oauth can be tricky. for multiple providers, try using firebase custom tokens. store access tokens securely in firestore with user-specific security rules. check out passportjs for handling different oauth flows. good luck with ur project!