file_handler.hh

/*
 * This file is open source software, licensed to you under the terms
 * of the Apache License, Version 2.0 (the "License").  See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership.  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.
 */
/*
 * Copyright 2015 Cloudius Systems
 */
 
#pragma once
 
#include <seastar/http/handlers.hh>
#include <seastar/core/iostream.hh>
#include <seastar/util/modules.hh>
 
namespace seastar {
 
namespace httpd {
 
SEASTAR_MODULE_EXPORT_BEGIN
class file_transformer {
public:
    virtual output_stream<char> transform(std::unique_ptr<http::request> req,
            const sstring& extension, output_stream<char>&& s) = 0;
    file_transformer() = default;
    file_transformer(file_transformer&&) = default;
    virtual ~file_transformer() = default;
};
 
class file_interaction_handler : public handler_base {
public:
    file_interaction_handler(file_transformer* p = nullptr)
            : transformer(p) {
 
    }
 
    ~file_interaction_handler();
 
    file_interaction_handler* set_transformer(file_transformer* t) {
        transformer = t;
        return this;
    }
 
    bool redirect_if_needed(const http::request& req, http::reply& rep) const;
 
    static sstring get_extension(const sstring& file);
 
protected:
 
    future<std::unique_ptr<http::reply> > read(sstring file,
            std::unique_ptr<http::request> req, std::unique_ptr<http::reply> rep);
    file_transformer* transformer;
 
    output_stream<char> get_stream(std::unique_ptr<http::request> req,
            const sstring& extension, output_stream<char>&& s);
};
 
class directory_handler : public file_interaction_handler {
public:
 
    explicit directory_handler(const sstring& doc_root,
            file_transformer* transformer = nullptr);
 
    future<std::unique_ptr<http::reply>> handle(const sstring& path,
            std::unique_ptr<http::request> req, std::unique_ptr<http::reply> rep) override;
 
private:
    sstring doc_root;
};
 
class file_handler : public file_interaction_handler {
public:
 
    explicit file_handler(const sstring& file, file_transformer* transformer =
            nullptr, bool force_path = true)
            : file_interaction_handler(transformer), file(file), force_path(
                    force_path) {
    }
 
    future<std::unique_ptr<http::reply>> handle(const sstring& path,
            std::unique_ptr<http::request> req, std::unique_ptr<http::reply> rep) override;
 
private:
    sstring file;
    bool force_path;
};
 
SEASTAR_MODULE_EXPORT_END
}
 
}