// 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 batching file-download to send their

// respective HTTP responses.

//

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

//

// In HEAD request, then this handler will return the list of files in the specified directory.

//

// In GET request, the file names to download are specified in the request body as a list of strings,

// separated by '\n'. To avoid cost resource, the maximum number of files to download in a batch is 64.

class BatchDownloadAction : public HttpHandlerWithAuth {

public:

    BatchDownloadAction(ExecEnv* exec_env,

                        std::shared_ptr<bufferevent_rate_limit_group> rate_limit_group,

                        const std::vector<std::string>& allow_dirs);

    ~BatchDownloadAction() override = default;

    void handle(HttpRequest* req) override;

private:

    Status _check_token(HttpRequest* req);

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

    void _handle(HttpRequest* req, const std::string& dir_path);

    void _handle_batch_download(HttpRequest* req, const std::string& dir_path);

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

    std::shared_ptr<bufferevent_rate_limit_group> _rate_limit_group;

};

} // end namespace doris