/*
 * Copyright (c) 2020 Baidu, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package filters

import (
	"net/http"

	kunErr "github.com/baidu/easyfaas/pkg/error"

	"github.com/baidu/easyfaas/pkg/rest"
)

// WithSimpleAuthTokenVerify xxx
func WithSimpleAuthTokenVerify(handler http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if err := SimpleAuthTokenVerify(w, r); err == nil {
			handler.ServeHTTP(w, r)
		}
	})
}

// SimpleAuthTokenVerify xxx
func SimpleAuthTokenVerify(w http.ResponseWriter, r *http.Request) error {
	valid := false
	token := r.Header.Get("X-Auth-Token")

	for _, validToken := range rest.DefaultInternalValidAuthTokens {
		if token == validToken {
			valid = true
		}
	}

	if !valid {
		w.WriteHeader(http.StatusForbidden)
		return kunErr.NewUnrecognizedClientException("simple auth failed", nil).WithErrorLog().WriteTo(w)
	}
	return nil
}
