// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you 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.

#pragma once

#include <string>

#include <vector>

#include "common/status.h"

#include "service/http/http_handler.h"

#include "service/http/http_handler_with_auth.h"

#include "util/threadpool.h"

struct bufferevent_rate_limit_group;

namespace doris {

class ExecEnv;

class HttpRequest;

// A simple handler that serves incoming HTTP requests of file-download to send their respective HTTP responses.

//

// TODO(lingbin): implements two useful header ('If-Modified-Since' and 'RANGE') to reduce

// transmission consumption.

// We use parameter named 'file' to specify the static resource path, it is an absolute path.

class DownloadAction : public HttpHandlerWithAuth {

public:

    DownloadAction(ExecEnv* exec_env,

                   std::shared_ptr<bufferevent_rate_limit_group> rate_limit_group,

                   const std::vector<std::string>& allow_dirs, int32_t num_workers = 0);

    // for load error

    DownloadAction(ExecEnv* exec_env, const std::string& error_log_root_dir);

    virtual ~DownloadAction() {}

    void handle(HttpRequest* req) override;

private:

    enum DOWNLOAD_TYPE {

        NORMAL = 1,

        ERROR_LOG = 2,

    };

    Status check_token(HttpRequest* req);

    Status check_path_is_allowed(const std::string& path);

    Status check_log_path_is_allowed(const std::string& file_path);

    void handle_normal(HttpRequest* req, const std::string& file_param);

    void handle_error_log(HttpRequest* req, const std::string& file_param);

    void _handle(HttpRequest* req);

    DOWNLOAD_TYPE _download_type;

    std::vector<std::string> _allow_paths;

    std::string _error_log_root_dir;

    int32_t _num_workers;

    std::unique_ptr<ThreadPool> _download_workers;

    std::shared_ptr<bufferevent_rate_limit_group> _rate_limit_group;

}; // end class DownloadAction

} // end namespace doris