http_message.h

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// Copyright (C) 2017-2018 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef HTTP_MESSAGE_H
#define HTTP_MESSAGE_H

#include <exceptions/exceptions.h>
#include <http/http_header.h>
#include <http/http_types.h>
#include <map>
#include <set>
#include <cstdint>
#include <string>

namespace isc {
namespace http {

class HttpMessageError : public Exception {
public:
    HttpMessageError(const char* file, size_t line, const char* what) :
        isc::Exception(file, line, what) { };
};

class HttpMessageNonExistingHeader : public HttpMessageError {
public:
    HttpMessageNonExistingHeader(const char* file, size_t line,
                                 const char* what) :
        HttpMessageError(file, line, what) { };
};


class HttpMessage {
public:

    enum Direction {
        INBOUND,
        OUTBOUND
    };

    explicit HttpMessage(const Direction& direction);

    virtual ~HttpMessage();

    Direction getDirection() const {
        return (direction_);
    }

    void setDirection(const Direction& direction) {
        direction_ = direction;
    }

    void requireHttpVersion(const HttpVersion& version);

    void requireHeader(const std::string& header_name);

    void requireHeaderValue(const std::string& header_name,
                            const std::string& header_value);

    bool requiresBody() const;

    virtual void create() = 0;

    virtual void finalize() = 0;

    virtual void reset() = 0;

    HttpVersion getHttpVersion() const;

    HttpHeaderPtr getHeader(const std::string& header_name) const;

    std::string getHeaderValue(const std::string& header_name) const;

    uint64_t getHeaderValueAsUint64(const std::string& header_name) const;

    virtual std::string getBody() const = 0;

    virtual std::string toString() const = 0;

    bool isFinalized() const {
        return (finalized_);
    }

protected:

    void checkCreated() const;

    void checkFinalized() const;

    template<typename T>
    bool inRequiredSet(const T& element,
                       const std::set<T>& element_set) const {
        return (element_set.empty() || element_set.count(element) > 0);
    }

    Direction direction_;

    std::set<HttpVersion> required_versions_;

    HttpVersion http_version_;

    typedef std::map<std::string, HttpHeaderPtr> HttpHeaderMap;

    HttpHeaderMap required_headers_;

    bool created_;

    bool finalized_;

    HttpHeaderMap headers_;
};

} // end of namespace isc::http
} // end of namespace isc

#endif // HTTP_MESSAGE_H