middleware

var JwtAuthentication = func(next http.Handler) http.Handler {

	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {

		notAuth := []string{"/api/users/new", "/api/users/login", "/api/healthcheck", "/api/stats"}
		requestPath := r.URL.Path

		for _, value := range notAuth {
			if value == requestPath {
				next.ServeHTTP(w, r)
				return
			}
		}

		var response map[string]interface{}
		tokenHeader := r.Header.Get("Authorization")

		if tokenHeader == "" {
			response = u.Message(false, "Missing auth token")
			w.WriteHeader(http.StatusForbidden)
			w.Header().Add("Content-Type", "application/json")
			u.Respond(w, response)
			return
		}

		tk := &models.Token{}

		token, err := jwt.ParseWithClaims(tokenHeader, tk, func(token *jwt.Token) (interface{}, error) {
			return []byte(os.Getenv("token_password")), nil
		})

		if err != nil {
			response = u.Message(false, "Malformed authentication token")
			w.WriteHeader(http.StatusForbidden)
			w.Header().Add("Content-Type", "application/json")
			u.Respond(w, response)
			return
		}

		if !token.Valid {
			response = u.Message(false, "Token is not valid.")
			w.WriteHeader(http.StatusForbidden)
			w.Header().Add("Content-Type", "application/json")
			u.Respond(w, response)
			return
		}

		ctx := context.WithValue(r.Context(), "user", tk.UserID)
		r = r.WithContext(ctx)
		next.ServeHTTP(w, r)
	})
}