/*
 * This file is a part of Winix
 * and is distributed under the 2-Clause BSD licence.
 * Author: Tomasz Sowa <t.sowa@ttmath.org>
 */

/*
 * Copyright (c) 2010-2022, Tomasz Sowa
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include "http.h"
#include "core/lock.h"
#include "core/log.h"
#include "utf8/utf8.h"
#include "core/header.h"


namespace Winix
{



Http::Http()
{
	begin();
}


/*
 * prepare to start a new request
 */
Http & Http::begin()
{
	curl = nullptr;
	synchro = nullptr;
	browser_name = "Winix";
	conn_timeout = 30;
	http_headers = nullptr;
	read_function_input = nullptr;
	read_function_index = 0;
	additional_space_headers_to_send = nullptr;
	additional_string_headers_to_send = nullptr;
	additional_wstring_headers_to_send = nullptr;
	bearer_token = nullptr;
	output_headers_space = nullptr;
	change_header_names_to_lower = true;
	output_content_type = nullptr;
	debug_mode = 0;
	debug_info = nullptr;
	follow_location = true;
	verify_ssl_cert = true;
	forse_ssl_version = false;
	ssl_version = 0;
	ca_path = nullptr;
	ca_path_utf8.clear();
	client_cert = nullptr;
	client_key = nullptr;
	client_cert_utf8.clear();
	client_key_utf8.clear();

	return *this;
}



Http::~Http()
{
	uninitialize_curl();
}



Http & Http::add_header(const pt::TextStream & header)
{
	header.to_str(temp_header_ascii);
	add_header(temp_header_ascii);

	return *this;
}


Http & Http::add_header(const pt::WTextStream & header)
{
	header.to_str(temp_header_ascii);
	add_header(temp_header_ascii);

	return *this;
}


Http & Http::add_header(const std::string & header)
{
	if( !header.empty() )
	{
		http_headers = curl_slist_append(http_headers, header.c_str());
	}

	return *this;
}


Http & Http::add_header(const std::wstring & header)
{
	if( !header.empty() )
	{
		pt::wide_to_utf8(header, temp_header_ascii);
		http_headers = curl_slist_append(http_headers, temp_header_ascii.c_str());
	}

	return *this;
}


Http & Http::add_header(const char * str, size_t len)
{
	if( len > 0 )
	{
		temp_header_ascii.assign(str, len);
		http_headers = curl_slist_append(http_headers, temp_header_ascii.c_str());
	}

	return *this;
}


Http & Http::add_header(const wchar_t * str, size_t len)
{
	if( len > 0 )
	{
		pt::wide_to_utf8(str, len, temp_header_ascii);
		http_headers = curl_slist_append(http_headers, temp_header_ascii.c_str());
	}

	return *this;
}





Http & Http::add_headers(pt::Space * headers)
{
	additional_space_headers_to_send = headers;
	return *this;
}


Http & Http::add_headers(pt::Space & headers)
{
	additional_space_headers_to_send = &headers;
	return *this;
}


Http & Http::add_headers(const char * headers)
{
	additional_string_headers_to_send = headers;
	return *this;
}


Http & Http::add_headers(const wchar_t * headers)
{
	additional_wstring_headers_to_send = headers;
	return *this;
}


Http & Http::add_headers(const std::string & headers)
{
	additional_string_headers_to_send = headers.c_str();
	return *this;
}


Http & Http::add_headers(const std::wstring & headers)
{
	additional_wstring_headers_to_send = headers.c_str();
	return *this;
}


Http & Http::get_output_headers_to(pt::Space * out_headers, bool change_names_to_lower)
{
	this->output_headers_space = out_headers;
	this->change_header_names_to_lower = change_names_to_lower;
	return *this;
}


Http & Http::get_output_content_type_to(std::wstring * out_content_type)
{
	this->output_content_type = out_content_type;
	return *this;
}


Http & Http::add_bearer_token(const wchar_t * token)
{
	this->bearer_token = token;
	return *this;
}


Http & Http::add_bearer_token(const std::wstring & token)
{
	this->bearer_token = token.c_str();
	return *this;
}


bool Http::fetch(Method method, const wchar_t * url, const std::string * in, pt::WTextStream & out,  bool clear_stream)
{
	std::string url_ascii;
	pt::TextStream out_stream;

	if( clear_stream )
	{
		out.clear();
	}

	pt::wide_to_utf8(url, url_ascii);

	bool status = fetch_internal(method, url_ascii.c_str(), in, out_stream);
	out << out_stream;

	return status;
}


bool Http::fetch(Method method, const std::wstring & url, const std::string * in, pt::WTextStream & out, bool clear_stream)
{
	return fetch(method, url.c_str(), in, out, clear_stream);
}


bool Http::fetch(Method method, const wchar_t * url, pt::WTextStream * in, pt::WTextStream & out,  bool clear_stream)
{
	if( in )
	{
		std::string in_ascii;
		in->to_str(in_ascii);

		return fetch(method, url, &in_ascii, out, clear_stream);
	}
	else
	{
		const std::string * in = nullptr;
		return fetch(method, url, in, out, clear_stream);
	}
}



bool Http::get(const wchar_t * url, std::wstring & out, bool clear_str)
{
	const std::string * in = nullptr;
	pt::WTextStream out_stream;
	bool status = fetch(Method::method_get, url, in, out_stream, false);
	out_stream.to_str(out, clear_str);

	return status;
}


bool Http::get(const std::wstring & url, std::wstring & out, bool clear_str)
{
	return get(url.c_str(), out, clear_str);
}


bool Http::get(const pt::WTextStream & url, std::wstring & out,  bool clear_str)
{
	std::wstring url_str;
	url.to_str(url_str);
	return get(url_str, out, clear_str);
}


bool Http::get(const wchar_t * url, pt::WTextStream & out, bool clear_stream)
{
	const std::string * in = nullptr;
	return fetch(Method::method_get, url, in, out, clear_stream);
}


bool Http::get(const std::wstring & url, pt::WTextStream & out,  bool clear_stream)
{
	return get(url.c_str(), out, clear_stream);
}



bool Http::get(const pt::WTextStream & url, pt::WTextStream & out, bool clear_stream)
{
	std::wstring url_str;
	url.to_str(url_str);
	return get(url_str, out, clear_stream);
}


bool Http::post(const wchar_t * url, const std::string & in, pt::WTextStream & out, bool clear_stream)
{
	return fetch(Method::method_post, url, &in, out, clear_stream);
}


bool Http::post(const std::wstring & url, const std::string & in, pt::WTextStream & out, bool clear_stream)
{
	return fetch(Method::method_post, url, &in, out, clear_stream);
}


bool Http::post(const wchar_t * url, pt::WTextStream & in, pt::WTextStream & out, bool clear_stream)
{
	return fetch(Method::method_post, url, &in, out, clear_stream);
}


bool Http::put(const wchar_t * url, const std::string & in, pt::WTextStream & out, bool clear_stream)
{
	return fetch(Method::method_put, url, &in, out, clear_stream);
}


bool Http::put(const std::wstring & url, const std::string & in, pt::WTextStream & out, bool clear_stream)
{
	return fetch(Method::method_put, url, &in, out, clear_stream);
}


bool Http::put(const wchar_t * url, pt::WTextStream & in, pt::WTextStream & out, bool clear_stream)
{
	return fetch(Method::method_put, url, &in, out, clear_stream);
}


long Http::get_status()
{
	long status = -1;

	if( curl )
	{
		curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &status);
	}

	return status;
}



void Http::clear_tmp_objects()
{
	out_headers_stream.clear();
	temp_header.clear();
	temp_header_ascii.clear();
	temp_header_value.clear();
	temp_header_value_ascii.clear();
}


void Http::reset_headers()
{
	if( http_headers )
	{
		curl_slist_free_all(http_headers);
		http_headers = nullptr;
	}
}


void Http::add_additional_space_headers()
{
	if( additional_space_headers_to_send && additional_space_headers_to_send->is_object() )
	{
		pt::WTextStream header;
		pt::Space::ObjectType::iterator i = additional_space_headers_to_send->value.value_object.begin();

		while( i != additional_space_headers_to_send->value.value_object.end() )
		{
			header.clear();
			header << i->first << ": ";
			pt::Space * value = i->second;

			if( value->is_wstr() )
			{
				header << value->value.value_wstring;
			}
			else
				if( value->is_str() )
			{
				header << value->value.value_string;
			}
			else
			{
				header << i->second->to_wstr();
			}

			add_header(header);
			++i;
		}
	}
}


void Http::add_additional_string_headers()
{
	if( additional_string_headers_to_send )
	{
		add_additional_string_headers(additional_string_headers_to_send);
	}

	if( additional_wstring_headers_to_send )
	{
		add_additional_string_headers(additional_wstring_headers_to_send);
	}
}



void Http::add_bearer_token()
{
	if( bearer_token && bearer_token[0] != 0 )
	{
		pt::WTextStream header;
		header << L"Authorization: Bearer " << bearer_token;
		add_header(header);
	}
}


void Http::allow_redirects(bool allow_redirects)
{
	this->follow_location = allow_redirects;
}


void Http::set_ssl_version(long ssl_version)
{
	this->forse_ssl_version = true;
	this->ssl_version = ssl_version;
}


void Http::verify_ssl(bool verify)
{
	this->verify_ssl_cert = verify;
}


void Http::set_ca_file(const wchar_t * path)
{
	ca_path = path;
}


void Http::set_ca_file(const std::wstring & path)
{
	ca_path = path.c_str();
}


void Http::set_client_cert(const wchar_t * client_cert, const wchar_t * client_key)
{
	this->client_cert = client_cert;
	this->client_key = client_key;
}


void Http::set_client_cert(const std::wstring & client_cert, const std::wstring & client_key)
{
	this->client_cert = client_cert.c_str();
	this->client_key = client_key.c_str();
}




void Http::initialize_curl_if_needed()
{
	if( !curl )
	{
		/*
		 * curl_easy_init() is not thread safe before curl 7.84.0 version
		 *
		 * from https://curl.se/libcurl/c/curl_easy_init.html
		 * If you did not already call curl_global_init, curl_easy_init does it automatically.
		 * This may be lethal in multi-threaded cases, since curl_global_init is not thread-safe,
		 * and it may result in resource problems because there is no corresponding cleanup.
		 *
		 * but we have called curl_global_init() in main.cpp (InitCurlLibrary() method)
		 *
		 */
		curl = curl_easy_init();
	}
}


void Http::uninitialize_curl()
{
	if( curl )
	{
		curl_easy_cleanup(curl);
		curl = nullptr;
	}
}


void Http::use_debug_mode(bool debug, pt::Space * debug_info)
{
	this->debug_mode = debug ? 1 : 0;
	this->debug_info = debug_info;
}


// in can be pointer to const char *
bool Http::fetch_internal(Method method, const char * url, const std::string * in, pt::TextStream & out)
{
	bool status = false;
	initialize_curl_if_needed();

	if( output_headers_space )
		output_headers_space->clear();

	if( output_content_type )
		output_content_type->clear();

	if( !curl )
	{
		log << log1 << "Http: I can't initialize curl easy session" << logend;
		return status;
	}

	error_buf[0] = 0;

	read_function_input = in; // can be null
	read_function_index = 0;

	put_method(method);

	if( read_function_input )
	{
		curl_easy_setopt(curl, CURLOPT_READFUNCTION, 	fetch_read_function);
		curl_easy_setopt(curl, CURLOPT_READDATA,		this);
		curl_easy_setopt(curl, CURLOPT_SEEKFUNCTION, 	fetch_seek_function);
		curl_easy_setopt(curl, CURLOPT_SEEKDATA,		this);
		curl_off_t size = read_function_input->size();
		curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE_LARGE, size);
	}

	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION,	fetch_write_function);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA,		&out);
	curl_easy_setopt(curl, CURLOPT_URL,				url);
	curl_easy_setopt(curl, CURLOPT_USERAGENT,		browser_name.c_str());
	curl_easy_setopt(curl, CURLOPT_TIMEOUT,			conn_timeout);
	curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT,	conn_timeout);
	curl_easy_setopt(curl, CURLOPT_ERRORBUFFER,		error_buf);
	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION,	(follow_location) ? 1 : 0);
	curl_easy_setopt(curl, CURLOPT_MAXREDIRS,		20);
	curl_easy_setopt(curl, CURLOPT_NOSIGNAL,		1);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER,	(verify_ssl_cert) ? 1 : 0);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST,	(verify_ssl_cert) ? 2 : 0); // set to 2: https://curl.se/libcurl/c/CURLOPT_SSL_VERIFYHOST.html

	if( debug_mode == 1 )
	{
		curl_easy_setopt(curl, CURLOPT_VERBOSE,			debug_mode);
		curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION,	debug_function);
		curl_easy_setopt(curl, CURLOPT_DEBUGDATA,		this);
	}

	if( output_headers_space || output_content_type )
	{
		out_headers_stream.clear();
		curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION,  fetch_header_function);
		curl_easy_setopt(curl, CURLOPT_HEADERDATA,		&out_headers_stream);
	}

	if( forse_ssl_version )
	{
		curl_easy_setopt(curl, CURLOPT_SSLVERSION,  ssl_version);
	}

	if( ca_path )
	{
		pt::wide_to_utf8(ca_path, ca_path_utf8);
		curl_easy_setopt(curl, CURLOPT_CAINFO, ca_path_utf8.c_str());
	}

	if( client_cert )
	{
		pt::wide_to_utf8(client_cert, client_cert_utf8);
		curl_easy_setopt(curl, CURLOPT_SSLCERT, client_cert_utf8.c_str());
	}

	if( client_key )
	{
		pt::wide_to_utf8(client_key, client_key_utf8);
		curl_easy_setopt(curl, CURLOPT_SSLKEY, client_key_utf8.c_str());
	}

	// block the Expect: 100-continue header
	// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Expect
	// https://httpwg.org/specs/rfc7231.html#header.expect
	// https://curl.se/libcurl/c/post-callback.html
	/*
	      Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue"
	      header.  You can disable this header with CURLOPT_HTTPHEADER as usual.
	      NOTE: if you want chunked transfer too, you need to combine these two
	      since you can only set one list of headers with CURLOPT_HTTPHEADER.
	*/
	//add_header(L"Expect:");

	add_additional_space_headers();
	add_additional_string_headers();
	add_bearer_token();

	if( http_headers )
	{
		curl_easy_setopt(curl, CURLOPT_HTTPHEADER, 	http_headers);
	}

	CURLcode res = curl_easy_perform(curl);
	reset_headers();

	if( res == CURLE_OK )
	{
		status = true;
		parse_headers();
	}
	else
	{
		log << log1 << "Http: fetching failed: " << error_buf << ", code: "
			<< static_cast<int>(res) << logend;
	}

	clear_tmp_objects();
	return status;
}


void Http::put_method(Method & method)
{
	// we don't put 'get' here

	switch(method)
	{
	case Method::method_post:
		curl_easy_setopt(curl, CURLOPT_POST, 1);
		break;

	case Method::method_put:
		curl_easy_setopt(curl, CURLOPT_PUT, 1);
		break;

	case Method::method_patch:
		curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "PATCH");
		break;

	case Method::method_delete:
		curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "DELETE");
		break;

	case Method::method_options:
		curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "OPTIONS");
		break;

	default:
		break;
	}
}


size_t Http::fetch_read_function(char * ptr, size_t size, size_t nmemb, void * userdata)
{
	size_t len = 0;

	if( userdata )
	{
		Http * http = reinterpret_cast<Http*>(userdata);

		if( http->read_function_index < http->read_function_input->size() )
		{
			len = size * nmemb;

			if( http->read_function_index + len > http->read_function_input->size() )
			{
				len = http->read_function_input->size() - http->read_function_index;
			}

			for(size_t i=0 ; i < len ; ++i)
			{
				ptr[i] = (*http->read_function_input)[http->read_function_index + i];
			}

			http->read_function_index += len;
		}
	}

	return len;
}


int Http::fetch_seek_set(Http * http, curl_off_t offset)
{
	int status = CURL_SEEKFUNC_CANTSEEK;
	size_t offset_size = static_cast<size_t>(offset);

	if( offset_size >=0 && offset_size < http->read_function_input->size() )
	{
		http->read_function_index = offset_size;
		status = CURL_SEEKFUNC_OK;
	}

	return status;
}


int Http::fetch_seek_cur(Http * http, curl_off_t offset)
{
	int status = CURL_SEEKFUNC_CANTSEEK;

	if( offset >= 0 )
	{
		size_t offset_size = static_cast<size_t>(offset);

		if( http->read_function_index + offset_size < http->read_function_input->size() )
		{
			http->read_function_index += offset_size;
			status = CURL_SEEKFUNC_OK;
		}
	}
	else
	{
		size_t offset_size = static_cast<size_t>(-offset);

		if( http->read_function_index >= offset_size )
		{
			http->read_function_index -= offset_size;
			status = CURL_SEEKFUNC_OK;
		}
	}

	return status;
}


int Http::fetch_seek_end(Http * http, curl_off_t offset)
{
	int status = CURL_SEEKFUNC_CANTSEEK;

	if( offset < 0 )
	{
		size_t offset_size = static_cast<size_t>(-offset);

		if( offset_size <= http->read_function_input->size() )
		{
			http->read_function_index = http->read_function_input->size() - offset_size;
			status = CURL_SEEKFUNC_OK;
		}
	}

	return status;
}




/*
 *
 * https://curl.se/libcurl/c/CURLOPT_SEEKFUNCTION.html
 *
 * These are the return codes for the seek callbacks
 *
 * #define CURL_SEEKFUNC_OK       0
 * #define CURL_SEEKFUNC_FAIL     1  // fail the entire transfer
 * #define CURL_SEEKFUNC_CANTSEEK 2  / /tell libcurl seeking cannot be done, so
 *                                     libcurl might try other means instead
 *
 */
int Http::fetch_seek_function(void * userdata, curl_off_t offset, int origin)
{
	Http * http = reinterpret_cast<Http*>(userdata);
	int status = CURL_SEEKFUNC_FAIL;

	if( origin == SEEK_SET )
	{
		status = fetch_seek_set(http, offset);
	}
	else
	if( origin == SEEK_CUR )
	{
		status = fetch_seek_cur(http, offset);
	}
	else
	if( origin == SEEK_END )
	{
		status = fetch_seek_end(http, offset);
	}

	return status;
}





size_t Http::fetch_write_function(char * ptr, size_t size, size_t nmemb, void * userdata)
{
	size_t len = size * nmemb;

	if( userdata )
	{
		pt::TextStream * out = reinterpret_cast<pt::TextStream*>(userdata);

		if( len > 0 )
			out->write(ptr, len);
	}

	return len;
}


size_t Http::fetch_header_function(char * ptr, size_t size, size_t nmemb, void * userdata)
{
	size_t len = size * nmemb;

	if( userdata  )
	{
		pt::TextStream * out = reinterpret_cast<pt::TextStream*>(userdata);

		if( len > 0 )
			out->write(ptr, len);
	}

	return len;
}



void Http::skip_white(pt::TextStream::iterator & i)
{
	for( ; i != out_headers_stream.end() ; ++i )
	{
		if( !pt::is_white(*i, false, false) )
		{
			break;
		}
	}
}


void Http::parse_header_name(pt::TextStream::iterator & i, std::string & name)
{
	name.clear();

	for( ; i != out_headers_stream.end() ; ++i )
	{
		char c = *i;

		if( c == '\r' )
		{
			// just skip
		}
		else
		if( c == '\n' )
		{
			break;
		}
		else
		if( c == ':' )
		{
			++i;
			break;
		}
		else
		{
			if( change_header_names_to_lower )
			{
				c = pt::to_lower(c);
			}

			name += c;
		}
	}
}


void Http::parse_header_value(pt::TextStream::iterator & i, std::string & value)
{
	value.clear();

	for( ; i != out_headers_stream.end() ; ++i )
	{
		char c = *i;

		if( c == '\r' )
		{
			// just skip
		}
		else
		if( c == '\n' )
		{
			++i;
			break;
		}
		else
		{
			value += c;
		}
	}
}


void Http::parse_headers()
{
	if( output_headers_space || output_content_type )
	{
		pt::TextStream::iterator i = out_headers_stream.begin();

		while( i != out_headers_stream.end() )
		{
			parse_header_name(i, temp_header_ascii);
			skip_white(i);
			parse_header_value(i, temp_header_value_ascii);

			pt::utf8_to_wide(temp_header_ascii, temp_header);
			pt::utf8_to_wide(temp_header_value_ascii, temp_header_value);

			// both temp_header and temp_header_value will be empty
			// after the first header 'HTTP/1.1 100 Continue' (if exists)
			// (there is an empty line in such a case)
			if( !temp_header.empty() || !temp_header_value.empty() )
			{
				if( output_headers_space )
					output_headers_space->add(temp_header, temp_header_value);

				if( output_content_type && pt::is_equal_nc(temp_header, Header::content_type) )
					*output_content_type = temp_header_value;
			}
		}

		temp_header.clear();
		temp_header_ascii.clear();
		temp_header_value.clear();
		temp_header_value_ascii.clear();
	}
}


void Http::debug_function_append(pt::Space & debug, const char * prefix, const char * start, size_t part_size)
{
	if( part_size > 0 )
	{
		debug.add(prefix);
		std::string & last_table_str_item = debug.value.value_table.back()->value.value_string;
		last_table_str_item.append(start, part_size);
	}
}


void Http::debug_function_append(Http * http, const char * prefix, char * data, size_t size)
{
	pt::Space & debug = *http->debug_info;
	const char * start = data;
	size_t part_size = 0;
	size_t i = 0;

	while( i < size )
	{
		if( data[i]== '\r' && i+1 < size && data[i+1]=='\n' )
		{
			debug_function_append(debug, prefix, start, part_size);
			i += 2;
			start = data + i;
			part_size = 0;
		}
		else
		if( data[i]== '\n' )
		{
			debug_function_append(debug, prefix, start, part_size);
			i += 1;
			start = data + i;
			part_size = 0;
		}
		else
		{
			part_size += 1;
			i += 1;
		}
	}

	debug_function_append(debug, prefix, start, part_size);
}



int Http::debug_function(CURL * handle, curl_infotype type, char * data, size_t size, void * userdata)
{
	Http * http = reinterpret_cast<Http*>(userdata);

	if( http->debug_info )
	{
		switch(type)
		{
		case CURLINFO_TEXT:
			debug_function_append(http, "", data, size);
			break;

		case CURLINFO_HEADER_IN:
			debug_function_append(http, "Header received: ", data, size);
			break;

		case CURLINFO_HEADER_OUT:
			debug_function_append(http, "Header sent: ", data, size);
			break;

		default:
			break;
		}
	}

	return 0;
}


const wchar_t * Http::method_to_str(Http::Method method)
{
	switch(method)
	{
	case method_get:
		return L"GET";

	case method_post:
		return L"POST";

	case method_put:
		return L"PUT";

	case method_patch:
		return L"PATCH";

	case method_delete:
		return L"DELETE";

	case method_options:
		return L"OPTIONS";

	default:
		return L"";
	}
}


}