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• Variables

Variables

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

	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		requestPath := r.URL.Path
		requestMethod := r.Method

		notAuth := []string{"/api/user/signup",
			"/api/user/login"}

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

		if strings.HasPrefix(requestPath, "/api/books") && requestMethod == http.MethodGet {
			next.ServeHTTP(w, r)
			return
		}

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

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

		splitted := strings.Split(tokenHeader, " ")

		if len(splitted) != 2 {
			response = u.Message(false, "Invalid/Malformed auth token")
			w.Header().Add("Content-Type", "application/json")
			u.Respond(w, response, http.StatusForbidden)
			return
		}

		tokenPart := splitted[1]
		tk := &models.Token{}

		token, err := jwt.ParseWithClaims(tokenPart, 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.Header().Add("Content-Type", "application/json")
			u.Respond(w, response, http.StatusForbidden)
			return
		}

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

		fmt.Sprintf("User %v", tk.UserId)
		ctx := context.WithValue(r.Context(), "user", tk.UserId)
		r = r.WithContext(ctx)
		next.ServeHTTP(w, r)
	})
}