dlib C++ Library - http_client.h

    #ifndef DLIB__BROWSER_H
    #define DLIB__BROWSER_H

    #include <map>
    #include <string>
    #include <vector>
    #include "http_client_abstract.h"

    // Default timeout after 60 seconds
    #define DEFAULT_TIMEOUT 60000

    namespace dlib
    {

        // Function which is called when there is data available.
        //   Return false to stop the download process...
        typedef bool (*fnOnDownload)(long already_downloaded, long total_to_download, void * userInfo);

        class http_client
        {
        public:
            http_client();

            typedef std::map< std::string, std::string > stringmap;
            typedef std::map< std::string, stringmap   > string_to_stringmap;
            typedef std::map< std::string, std::vector<std::string> > string_to_stringvector;

            // Header functions
            void        set_header(const std::string& header_name, const std::string& header_value);
            void        set_header(const std::string& header_name, long header_value);
            std::string get_header(const std::string& header_name) const;
            void        remove_header(const std::string& header_name);
            bool        is_header_set(const std::string& header_name) const;

            // This function will clear out all cookies & headers set until now
            void clear();
            // This function will clear out the Content-Type header
            void prepare_for_next_url();

            void set_callback_function( fnOnDownload od, void * _user_info ) { OnDownload = od; user_info = _user_info; }

            void set_cookie(const std::string& cookie_name, const std::string& cookie_value);
            void set_cookie(const std::string& cookie_name, long cookie_value);
            void remove_cookie(const std::string& cookie_name);

            void set_user_agent(const std::string& new_agent) { set_header("User-Agent", new_agent); }

            void set_timeout( unsigned int milliseconds = DEFAULT_TIMEOUT ) { timeout = milliseconds; }

            string_to_stringvector get_returned_headers() const { return returned_headers; }
            short                  get_http_return     () const { return http_return; }
            const std::string&     get_body            () const { return returned_body; }

            // POST
            const std::string& post_url (const std::string& url, const string_to_stringmap& postvars, const string_to_stringmap& filenames = string_to_stringmap());
            const std::string& post_url (const std::string& url, const std::string& postbuffer);
            // GET
            const std::string& get_url  (const std::string& url);

            bool has_error( ) const { return !error_field.empty(); }
            const std::string& get_error( ) const { return error_field; }

            static std::string urlencode(const std::string& in, bool post_encode = false);
            static std::string urldecode(const std::string& in);
        private:
            bool grab_url(const std::string& url, const std::string& method = "GET", const std::string& post_body = "");
            std::string build_post(std::string& content_type, const string_to_stringmap& postvars, const string_to_stringmap& filenames) const;

            std::string get_random_string( size_t length = 32 ) const;
            std::string get_basename( const std::string& filename ) const;
            std::string strtolower(const std::string& in) const;
            std::string strtoupper(const std::string& in) const;

            bool parse_url(const std::string& url, std::string& scheme, std::string& user, std::string& pass, std::string& host, short& port, std::string& path) const;

            stringmap headers;
            stringmap cookies;

            string_to_stringvector returned_headers;
            short http_return;
            std::string returned_body, error_field;

            unsigned int timeout;

            fnOnDownload OnDownload;
            void *       user_info;
        };

    }

    #ifdef NO_MAKEFILE
    #include "http_client.cpp"
    #endif

    #endif // DLIB__BROWSER_H