Utilizing Firebase SDK to verify jsonwebtoken

Currently, I am utilizing jsonwebtoken on the server using node to authenticate client requests (specifically with firebase 2.x sdks):

const jwt = require('jsonwebtoken')
jwt.verify(token, <firebase_secret>, (err, decoded) => { })

Up until now, this method has worked flawlessly with requests coming from both browser firebase javascript 2.x and ios firebase 2.x.

However, upon upgrading our ios sdk to firebase 3.x, validation of the token fails with a specific error: 

[JsonWebTokenError: jwt malformed] name: 'JsonWebTokenError', message: 'jwt malformed'
.

My objective moving forward is as follows:

  • To continue using browser firebase 2.x
  • To incorporate ios firebase 3.x
  • To still support node firebase 2.x

The question remains - Is there a way to configure the jwt.verify() function to successfully handle tokens originating from both browser 2.x and ios 3.x?

javascriptiosfirebasejwtfirebase-authentication

Answer №1

It turns out that there were changes in token signing algorithms and private keys between Firebase SDKs versions 2.x and 3.x.

  • The Node Firebase SDK for version 2.x is known as firebase-server.
  • While the Node Firebase SDK for version 3.x goes by the name firebase-admin.

To solve this issue, I decided to incorporate both libraries on the node server. Clients using version 2.x would send tokens with one key, while clients using version 3.x would send tokens with another key.

On the server-side, we can then decode with either the firebase-server library or the firebase-admin library depending on the type of token received. This approach allows us to update the iOS SDK without requiring simultaneous updates to the web SDK.

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