Echo's middleware for Firebase Authentication

echo_middleware_firebase_authentication.go

package middleware

import (
	"context"
	"strings"

	"github.com/labstack/echo/v4"

	firebase "firebase.google.com/go"
	"google.golang.org/api/option"
)

func Auth() echo.MiddlewareFunc {
	return auth
}

func auth(next echo.HandlerFunc) echo.HandlerFunc {
	return func(c echo.Context) error {
		opt := option.WithCredentialsFile("firebase_secret_key.json")
		app, err := firebase.NewApp(context.Background(), nil, opt)
		if err != nil {
			return err
		}

		client, err := app.Auth(context.Background())
		if err != nil {
			return err
		}

		auth := c.Request().Header.Get("Authorization")
		idToken := strings.Replace(auth, "Bearer ", "", 1)
		token, err := client.VerifyIDToken(context.Background(), idToken)
		if err != nil {
			return err
		}

		c.Set("token", token)
		return next(c)
	}
}

Usage

e.GET("/api/private", privateAPI, middleware.Auth())

token := c.Get("token").(*auth.Token)
claims := token.Claims
name, ok := claims["name"].(string)
email, ok := claims["email"].(string)

Thanks, It was helpful.

@nidhish1 Glad I could help 😄

🙏 thank you for this

@vectorman1 It's been a long time since I've been away from Go, but I'm glad to be of service.