Use Google authentication token with Firebase

Question

I have a .NET application (not a web app) where users are already authenticated by Google Authorization, and therefore a token has been issued.

I'd like this application to store user data to Firebase with a user read-write security rule of type: "$user_id === auth.uid".

Since you may authenticate to Firebase with Google, is there a way that the application would pass to Firebase an already Google issued token?

Frank van Puffelen · Accepted Answer · 2015-11-27 15:53:48Z

2

The Firebase REST API only takes Firebase JWT tokens. You can take the information from the Google token and mint a JWT from it, using one of the libraries Firebase provides for the purpose.

This is covered in the User Authentication section of the Firebase documentation.

answered Nov 27, 2015 at 15:53

Frank van Puffelen

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2 Comments

ericdes Over a year ago

I wanted to avoid the need for a server to generate JWT tokens, I was hoping for a .NET library that could authenticate via Google like the Firebase Javascript library does.

Frank van Puffelen Over a year ago

Although Firebase doesn't provide such a library, there are probably .NET OAuth clients out there. After you use one of those to authenticate the user, you can still mint a JWT based on the information.

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