Go Fiber Firebase Auth Middleware

Authenticate your endpoints with Firebase Authentication .

gofiber-firebaseauth is inspired by npm package express-firebase-auth .

Note1

This package is designed to work with Go Fiber Framework (Express inspired go framework)

Features

• Authenticate the user using Firebase before running the function.
• Ability to skip authentication on public API endpoints.

Installing / Getting started

In your gofiber app

$ go get -u github.com/gofiber/fiber/v2
$ go get github.com/sacsand/gofiber-firebaseauth

Configure

In your app import the middleware

import (
  "github.com/gofiber/fiber/v2"
  "github.com/sacsand/gofiber-firebaseauth"
)

Provide a minimal config

    // Provide a minimal config
    app.Use(gofiberfirebaseauth.New(Config{
    	FirebaseApp: FirebaseApp,
    }))

Or extend your config for customization

    // Or extend your config for customization
	app.Use(gofiberfirebaseauth.New(Config{
	
	// New firebase authentication object
	// Mandatory. Default: nil
	FirebaseApp:  FirebaseApp

	// Ignore urls array - Format = "{METHOD} follwed by :: then /{route}"
	// Optional. Default: nil
	IgnoreUrls : []string{"GET::/login","POST::/create-user"}

	// Skip Email Check.
	// Optional. Default: nil
	CheckEmailVerified : true

	// Ignore email verification for these routes
	// Optional. Default: nil
	CheckEmailVerifiedIgnoredUrls :  []string{"GET::/login","POST::/create-user"}

	// Authorizer defines a function which authenticates the Authorization token and returns 
	// the authenticated token
	// Optional. Default: nil
	Authorizer: func(IDToken string, CurrentURL string) (*auth.Token, error){
        // create your own authentication here 
	// this returns the firebase id token
		return token, nil
	},
	// Context key to store user information from the token into context.
	// Optional. Default: "user".
	ContextKey : "authUser"
    }))

Use user in your fiber app

func Handler(ctx *fiber.Ctx) error {
	// Get user stored in context
	// Default: user
	currentUser := ctx.Locals("user").(gofiberfirebaseauth.User)
	fmt.Println(currentUser)
	fmt.Println(currentUser.Email)

}

All available configuration

Option	Value	Config type
FirebaseApp	(Note1) An initialized firebase app. Refer to Firebase setup	FirebaseApp *firebase.App
IgnoredUrls	(Note1)(Optional) An array of URLs where you need to skip the authentication.	IgnoreUrls []string
CheckEmailVerified	(Optional) (Default: false) If set to true, only users with a verified email will be allowed access.	CheckEmailVerified bool
CheckEmailVerifiedIgnoredUrls	(Optional) An array of URLs where you need to skip the email verified check.	CheckEmailVerifiedIgnoredUrls []string
Authorizer	(Optional), Default: nil , Authorizer defines a function which authenticates the Authorization token and returns the authenticated token. Use this if you want to override token authorization	Authorizer func(string, string) (*auth.Token, error)
ContextKey	(Optional), Default: "user" , Context key to store user information from the token into context.	ContextKey string
SuccessHandler	(Optional), Default:nil, SuccessHandler defines a function which is executed for a valid token.	SuccessHandler fiber.Handler
ErrorHandler	(Optional), Default:nil, ErrorHandler defines a function which is executed for a invalid token.	ErrorHandler fiber.ErrorHandler

Note2

You must provide already initialized FirebaseApp app. You cannot initialize two firebase apps.

Note3

Ignore url accept array of string. URl format should follow below format
{METHOD}::/{url}
Example:
GET::/login
POST::/login

IgnoreUrl only supports routes without params or query . (PR are welcome).To ignore urls with param or query, declare the routes before the middleware declaration.

Developing , TESTING and environment setup

Prerequisites

• Go 1.14 +
• Configured Firebase app and Google Service Account Credential (JSON containing admin credentials). Refer to Firebase setup
• Web API Key
• Sample user email and password from firebase. You can manually create a user from the firebase console.

You can get all the configurations from Firebase Console.

Setting up Development Environment for testing

Clone the repo and set your firebase credentials in your .env file

SERVICE_ACCOUNT_JSON = "path to service account credential json"
WEB_API_KEY = 
TEST_USER_EMAIL = ""
TEST_USER_PASSWORD = ""
  	

Versioning

We use SemVer for versioning. For the versions available, see the link to tags on this repository.

Style guide

Uber style guide

License

MIT licensed.