@enkeldigital/firebase-authentication

@enkeldigital/firebase-authentication

Plugin to use with this library to integrate with firebase authentication.

Installation

npm install @enkeldigital/firebase-authentication

# Depends on this too
npm install create-express-auth-middleware

Example

1. Make a API call from client using this example to include an Authorization header

   Authorization: Bearer <your-client-token>
   

2. If an API call is made with a valid token, you can access the decoded token object from request

   const app = require("express")();
   const { create_authn_middleware, create_authz_middleware } = require("create-express-auth-middleware");
   const firebaseAuthentication = require("@enkeldigital/firebase-authentication");
   const { auth } = require("@enkeldigital/firebase-admin");
   
   // Make all routes in this express app to be authentication protected.
   // Meaning all routes defined later can only be called if a valid JWT is provided.
   // This DOES NOT mean that routes are fully protected yet,
   // as you need to ensure users have sufficient permission to access APIs using authorization middleware.
   app.use(create_authn_middleware(firebaseAuthentication(auth)));
   
   // The actual route that requires both authentication and authorization to run.
   app.get(
       "/data/:userID",
   
       // Add authorization middleware to ensure users can only access their own data
       // Checks that the specified userID in the URL matches user's own userID value in their 'DecodedIdToken'
       // The 'jwt' property is set by the authentication middleware that is registered above
       create_authz_middleware((req) => req.jwt.userID === req.params.userID),
   
       // This request handler will only run if both predicate above returns true!
       (req, res) => res.status(200).json({ data: "Protected user data" })
   );
   

3. If authentication failed, you get a 401 code with the following response by default

   { "ok": false, "error": "Authentication Failed" }
   

4. If authorization failed, you get a 403 code with the following response by default

   { "ok": false, "error": "Authorization Failed" }
   

License and Author

This project is made available under MIT LICENSE and written by JJ