Gin Cognito JWT Authentication Middleware

This is a JWT auth Gin middleware to validate JWT token issued by AWS Cognito identity manager. The implementation of this middleware is based on the AWS documentation on how to verify the JWT token

Here is an example of how can this be invoked. It should be attached to all endpoint you would want to authenticate against the user.

package main


import (
	ginjwt "github.com/akhettar/gin-jwt-cognito"
	"github.com/gin-gonic/gin"
	"github.com/golang-jwt/jwt"
)

func main() {

	// Creates a gin router with default middleware:
	router := gin.Default()

	// Create Cognito JWT auth middleware and set it  in all authenticated endpoints
	mw, err := ginjwt.AuthJWTMiddleware("<some_userpool_id>", "region")
	if err != nil {
		panic(err)
	}

	router.GET("/someGet", mw.MiddlewareFunc(), func(c *gin.Context) {
		token := c.MustGet(ginjwt.ContextToken)
		claims := token.(*jwt.Token).Claims.(jwt.MapClaims)
		user := make([]string, 0)
		if email, ok := claims["email"]; ok {
			user = append(user, email.(string))
		}

		if username, ok := claims["username"]; ok {
			user = append(user, username.(string))
		}

		c.JSON(200, gin.H{"user": user})
	})
	router.POST("/somePost", mw.MiddlewareFunc(), func(c *gin.Context) {
		// some implementation
	})
	router.PUT("/somePut", mw.MiddlewareFunc(), func(c *gin.Context) {
		// some implementation
	})

	// By default, it serves on :8080 unless a
	// PORT environment variable was defined.
	router.Run()
}

License

MIT