PresenceDetection/Util/HttpClient.cpp

#include <fstream>
#include <sstream>
#include <boost/algorithm/string.hpp>
#include <curl/curl.h>
#include <openssl/crypto.h>
#include "HttpClientHelpers.h"
#include "HttpClient.h"


namespace PresenceDetection {
namespace Util {

HttpClient::HttpClient()
{
	curl_global_init(CURL_GLOBAL_ALL);

	m_userAgents.push_back("Opera/9.80 (X11; Linux i686; U; en) Presto/2.7.62 Version/11.00");

	InitializeLocks();
}

HttpClient::~HttpClient()
{
	FreeLocks();
	curl_global_cleanup();
}

std::string HttpClient::GetUrlContents(const std::string& url) const
{
	std::string buffer;

	CURL* curl = curl_easy_init();

	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
	curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
	curl_easy_setopt(curl, CURLOPT_USERAGENT, m_userAgents[rand() % m_userAgents.size()].c_str());
	curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &WriteCallback);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);

	int code = 0;
	curl_easy_perform(curl);
	curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
	curl_easy_cleanup(curl);

	if (code != 200)
	{
		std::stringstream error;
		error << "Error (" << code << ") encountered while retrieving " << url << "\n";
		error << "Data: " << buffer;
		throw std::runtime_error(error.str());
	}

	return buffer;
}

void HttpClient::GetUrlSilent(const std::string& url) const
{
	CURL* curl = curl_easy_init();

	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
	curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
	curl_easy_setopt(curl, CURLOPT_USERAGENT, m_userAgents[rand() % m_userAgents.size()].c_str());
	curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &WriteCallback);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, nullptr);

	int code = 0;
	curl_easy_perform(curl);
	curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
	curl_easy_cleanup(curl);

	if (code != 200)
	{
		std::stringstream error;
		error << "Error (" << code << ") encountered while retrieving " << url << "\n";
		throw std::runtime_error(error.str());
	}
}

std::string HttpClient::GetUrlContents(const std::string& url, const std::string& cookieFile) const
{
	std::string buffer;

	CURL* curl = curl_easy_init();

	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
	curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
	curl_easy_setopt(curl, CURLOPT_USERAGENT, m_userAgents[rand() % m_userAgents.size()].c_str());
	curl_easy_setopt(curl, CURLOPT_COOKIEFILE, cookieFile.c_str());
	curl_easy_setopt(curl, CURLOPT_COOKIEJAR, cookieFile.c_str());
	curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &WriteCallback);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);

	int code = 0;
	curl_easy_perform(curl);
	curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
	curl_easy_cleanup(curl);

	if (code != 200)
	{
		std::stringstream error;
		error << "Error (" << code << ") encountered while retrieving " << url << "\n";
		error << "Data: " << buffer;
		throw std::runtime_error(error.str());
	}

	return buffer;
}

void HttpClient::GetUrlSilent(const std::string& url, const std::string& cookieFile) const
{
	CURL* curl = curl_easy_init();

	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
	curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
	curl_easy_setopt(curl, CURLOPT_USERAGENT, m_userAgents[rand() % m_userAgents.size()].c_str());
	curl_easy_setopt(curl, CURLOPT_COOKIEFILE, cookieFile.c_str());
	curl_easy_setopt(curl, CURLOPT_COOKIEJAR, cookieFile.c_str());
	curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &WriteCallback);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, nullptr);

	int code = 0;
	curl_easy_perform(curl);
	curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
	curl_easy_cleanup(curl);

	if (code != 200)
	{
		std::stringstream error;
		error << "Error (" << code << ") encountered while retrieving " << url << "\n";
		throw std::runtime_error(error.str());
	}
}

std::string HttpClient::GetUrlPostContents(const std::string& url, const std::string& postData, const std::string& contentType) const
{
	std::string buffer;

	CURL* curl = curl_easy_init();

	std::stringstream contentTypeString;
	contentTypeString << "Content-Type: " << contentType;

	struct curl_slist *list = NULL;
	list = curl_slist_append(list, contentTypeString.str().c_str());

	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
	curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
	curl_easy_setopt(curl, CURLOPT_USERAGENT, m_userAgents[rand() % m_userAgents.size()].c_str());
	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);
	curl_easy_setopt(curl, CURLOPT_POST, 1);
	curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postData.c_str());
	curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, postData.size());
	curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &WriteCallback);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);

	int code = 0;
	curl_easy_perform(curl);
	curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
	curl_easy_cleanup(curl);

	if (code != 200)
	{
		std::stringstream error;
		error << "Error (" << code << ") encountered while retrieving " << url << "\n";
		error << "Data: " << buffer;
		throw std::runtime_error(error.str());
	}

	return buffer;
}

void HttpClient::GetUrlPostSilent(const std::string& url, const std::string& postData, const std::string& contentType) const
{
	CURL* curl = curl_easy_init();

	std::stringstream contentTypeString;
	contentTypeString << "Content-Type: " << contentType;

	struct curl_slist *list = NULL;
	list = curl_slist_append(list, contentTypeString.str().c_str());

	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
	curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
	curl_easy_setopt(curl, CURLOPT_USERAGENT, m_userAgents[rand() % m_userAgents.size()].c_str());
	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);
	curl_easy_setopt(curl, CURLOPT_POST, 1);
	curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postData.c_str());
	curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, postData.size());
	curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &WriteCallback);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, nullptr);

	int code = 0;
	curl_easy_perform(curl);
	curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
	curl_easy_cleanup(curl);

	if (code != 200)
	{
		std::stringstream error;
		error << "Error (" << code << ") encountered while retrieving " << url << "\n";
		throw std::runtime_error(error.str());
	}
}

std::string HttpClient::GetUrlPostContents(const std::string& url, const std::string& cookieFile, const std::string& postData, const std::string& contentType) const
{
	std::string buffer;

	CURL* curl = curl_easy_init();

	std::stringstream contentTypeString;
	contentTypeString << "Content-Type: " << contentType;

	struct curl_slist *list = NULL;
	list = curl_slist_append(list, contentTypeString.str().c_str());

	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
	curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
	curl_easy_setopt(curl, CURLOPT_USERAGENT, m_userAgents[rand() % m_userAgents.size()].c_str());
	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);
	curl_easy_setopt(curl, CURLOPT_POST, 1);
	curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postData.c_str());
	curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, postData.size());
	curl_easy_setopt(curl, CURLOPT_COOKIEFILE, cookieFile.c_str());
	curl_easy_setopt(curl, CURLOPT_COOKIEJAR, cookieFile.c_str());
	curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &WriteCallback);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);

	int code = 0;
	curl_easy_perform(curl);
	curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
	curl_easy_cleanup(curl);

	if (code != 200)
	{
		std::stringstream error;
		error << "Error (" << code << ") encountered while retrieving " << url << "\n";
		error << "Data: " << buffer;
		throw std::runtime_error(error.str());
	}

	return buffer;
}

void HttpClient::GetUrlPostSilent(const std::string& url, const std::string& cookieFile, const std::string& postData, const std::string& contentType) const
{
	CURL* curl = curl_easy_init();

	std::stringstream contentTypeString;
	contentTypeString << "Content-Type: " << contentType;

	struct curl_slist *list = NULL;
	list = curl_slist_append(list, contentTypeString.str().c_str());

	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
	curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
	curl_easy_setopt(curl, CURLOPT_USERAGENT, m_userAgents[rand() % m_userAgents.size()].c_str());
	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);
	curl_easy_setopt(curl, CURLOPT_POST, 1);
	curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postData.c_str());
	curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, postData.size());
	curl_easy_setopt(curl, CURLOPT_COOKIEFILE, cookieFile.c_str());
	curl_easy_setopt(curl, CURLOPT_COOKIEJAR, cookieFile.c_str());
	curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &WriteCallback);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, nullptr);

	int code = 0;
	curl_easy_perform(curl);
	curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
	curl_easy_cleanup(curl);

	if (code != 200)
	{
		std::stringstream error;
		error << "Error (" << code << ") encountered while retrieving " << url << "\n";
		throw std::runtime_error(error.str());
	}
}

std::string HttpClient::GetUrlPostAttachmentContents(const std::string& url, const std::string& postData, const std::string& filename, const std::string& fileFieldname) const
{
	std::string buffer;
	std::string contents;
	std::ifstream fileStream(filename, std::ios::in | std::ios::binary);

	if (fileStream)
	{
		fileStream.seekg(0, std::ios::end);
		contents.resize(fileStream.tellg());
		fileStream.seekg(0, std::ios::beg);
		fileStream.read(&contents[0], contents.size());
		fileStream.close();
	}

	CURL* curl = curl_easy_init();
	CURLcode result;

	struct curl_httppost *formpost = nullptr;
	struct curl_httppost *lastptr = nullptr;
	struct curl_slist *headerlist = nullptr;
	static const char headerBuffer[] =  "Expect:";

	curl_global_init(CURL_GLOBAL_ALL);

	curl_formadd(&formpost, &lastptr,
		CURLFORM_COPYNAME, "cache-control:",
		CURLFORM_COPYCONTENTS, "no-cache",
		CURLFORM_END);

	curl_formadd(&formpost, &lastptr,
		CURLFORM_COPYNAME, "content-type:",
		CURLFORM_COPYCONTENTS, "multipart/form-data",
		CURLFORM_END);

	std::vector<std::string> postTokens;
	boost::split(postTokens, postData, boost::is_any_of("&"));

	for (std::vector<std::string>::iterator it = postTokens.begin(); it != postTokens.end(); ++it)
	{
		std::vector<std::string> tokens;
		boost::split(tokens, *it, boost::is_any_of("="));

		curl_formadd(&formpost, &lastptr,
			CURLFORM_COPYNAME, tokens[0].c_str(),
			CURLFORM_COPYCONTENTS, tokens[1].c_str(),
			CURLFORM_END);
	}

	curl_formadd(&formpost, &lastptr,
		CURLFORM_COPYNAME, fileFieldname.c_str(),
		CURLFORM_BUFFER, "data",
		CURLFORM_BUFFERPTR, contents.data(),
		CURLFORM_BUFFERLENGTH, contents.size(),
		CURLFORM_END);

	headerlist = curl_slist_append(headerlist, headerBuffer);

	curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
	curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &WriteCallback);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);

	int code = 0;
	curl_easy_perform(curl);
	curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
	curl_easy_cleanup(curl);
	curl_formfree(formpost);
	curl_slist_free_all(headerlist);

	if (code != 200)
	{
		std::stringstream error;
		error << "Error (" << code << ") encountered while retrieving " << url << "\n";
		error << "Data: " << buffer;
		throw std::runtime_error(error.str());
	}

	return buffer;
}

void HttpClient::GetUrlPostAttachmentSilent(const std::string& url, const std::string& postData, const std::string& filename, const std::string& fileFieldname) const
{
	std::string contents;
	std::ifstream fileStream(filename, std::ios::in | std::ios::binary);

	if (fileStream)
	{
		fileStream.seekg(0, std::ios::end);
		contents.resize(fileStream.tellg());
		fileStream.seekg(0, std::ios::beg);
		fileStream.read(&contents[0], contents.size());
		fileStream.close();
	}

	CURL* curl = curl_easy_init();
	CURLcode result;

	struct curl_httppost *formpost = nullptr;
	struct curl_httppost *lastptr = nullptr;
	struct curl_slist *headerlist = nullptr;
	static const char headerBuffer[] =  "Expect:";

	curl_global_init(CURL_GLOBAL_ALL);

	curl_formadd(&formpost, &lastptr,
		CURLFORM_COPYNAME, "cache-control:",
		CURLFORM_COPYCONTENTS, "no-cache",
		CURLFORM_END);

	curl_formadd(&formpost, &lastptr,
		CURLFORM_COPYNAME, "content-type:",
		CURLFORM_COPYCONTENTS, "multipart/form-data",
		CURLFORM_END);

	std::vector<std::string> postTokens;
	boost::split(postTokens, postData, boost::is_any_of("&"));

	for (std::vector<std::string>::iterator it = postTokens.begin(); it != postTokens.end(); ++it)
	{
		std::vector<std::string> tokens;
		boost::split(tokens, *it, boost::is_any_of("="));

		curl_formadd(&formpost, &lastptr,
			CURLFORM_COPYNAME, tokens[0].c_str(),
			CURLFORM_COPYCONTENTS, tokens[1].c_str(),
			CURLFORM_END);
	}

	curl_formadd(&formpost, &lastptr,
		CURLFORM_COPYNAME, fileFieldname.c_str(),
		CURLFORM_BUFFER, "data",
		CURLFORM_BUFFERPTR, contents.data(),
		CURLFORM_BUFFERLENGTH, contents.size(),
		CURLFORM_END);

	headerlist = curl_slist_append(headerlist, headerBuffer);

	curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
	curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);

	int code = 0;
	curl_easy_perform(curl);
	curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
	curl_easy_cleanup(curl);
	curl_formfree(formpost);
	curl_slist_free_all(headerlist);

	if (code != 200)
	{
		std::stringstream error;
		error << "Error (" << code << ") encountered while retrieving " << url << "\n";
		throw std::runtime_error(error.str());
	}
}

std::string HttpClient::GetUrlPostAttachmentContents(const std::string& url, const std::string& cookieFile, const std::string& postData, const std::string& filename, const std::string& fileFieldname) const
{
	std::string buffer;
	std::string contents;
	std::ifstream fileStream(filename, std::ios::in | std::ios::binary);

	if (fileStream)
	{
		fileStream.seekg(0, std::ios::end);
		contents.resize(fileStream.tellg());
		fileStream.seekg(0, std::ios::beg);
		fileStream.read(&contents[0], contents.size());
		fileStream.close();
	}

	CURL* curl = curl_easy_init();
	CURLcode result;

	struct curl_httppost *formpost = nullptr;
	struct curl_httppost *lastptr = nullptr;
	struct curl_slist *headerlist = nullptr;
	static const char headerBuffer[] =  "Expect:";

	curl_global_init(CURL_GLOBAL_ALL);

	curl_formadd(&formpost, &lastptr,
		CURLFORM_COPYNAME, "cache-control:",
		CURLFORM_COPYCONTENTS, "no-cache",
		CURLFORM_END);

	curl_formadd(&formpost, &lastptr,
		CURLFORM_COPYNAME, "content-type:",
		CURLFORM_COPYCONTENTS, "multipart/form-data",
		CURLFORM_END);

	std::vector<std::string> postTokens;
	boost::split(postTokens, postData, boost::is_any_of("&"));

	for (std::vector<std::string>::iterator it = postTokens.begin(); it != postTokens.end(); ++it)
	{
		std::vector<std::string> tokens;
		boost::split(tokens, *it, boost::is_any_of("="));

		curl_formadd(&formpost, &lastptr,
			CURLFORM_COPYNAME, tokens[0].c_str(),
			CURLFORM_COPYCONTENTS, tokens[1].c_str(),
			CURLFORM_END);
	}

	curl_formadd(&formpost, &lastptr,
		CURLFORM_COPYNAME, fileFieldname.c_str(),
		CURLFORM_BUFFER, "data",
		CURLFORM_BUFFERPTR, contents.data(),
		CURLFORM_BUFFERLENGTH, contents.size(),
		CURLFORM_END);

	headerlist = curl_slist_append(headerlist, headerBuffer);

	curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
	curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
	curl_easy_setopt(curl, CURLOPT_COOKIEFILE, cookieFile.c_str());
	curl_easy_setopt(curl, CURLOPT_COOKIEJAR, cookieFile.c_str());
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &WriteCallback);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);

	int code = 0;
	curl_easy_perform(curl);
	curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
	curl_easy_cleanup(curl);
	curl_formfree(formpost);
	curl_slist_free_all(headerlist);

	if (code != 200)
	{
		std::stringstream error;
		error << "Error (" << code << ") encountered while retrieving " << url << "\n";
		error << "Data: " << buffer;
		throw std::runtime_error(error.str());
	}

	return buffer;
}

void HttpClient::GetUrlPostAttachmentSilent(const std::string& url, const std::string& cookieFile, const std::string& postData, const std::string& filename, const std::string& fileFieldname) const
{
	std::string contents;
	std::ifstream fileStream(filename, std::ios::in | std::ios::binary);

	if (fileStream)
	{
		fileStream.seekg(0, std::ios::end);
		contents.resize(fileStream.tellg());
		fileStream.seekg(0, std::ios::beg);
		fileStream.read(&contents[0], contents.size());
		fileStream.close();
	}

	CURL* curl = curl_easy_init();
	CURLcode result;

	struct curl_httppost *formpost = nullptr;
	struct curl_httppost *lastptr = nullptr;
	struct curl_slist *headerlist = nullptr;
	static const char headerBuffer[] =  "Expect:";

	curl_global_init(CURL_GLOBAL_ALL);

	curl_formadd(&formpost, &lastptr,
		CURLFORM_COPYNAME, "cache-control:",
		CURLFORM_COPYCONTENTS, "no-cache",
		CURLFORM_END);

	curl_formadd(&formpost, &lastptr,
		CURLFORM_COPYNAME, "content-type:",
		CURLFORM_COPYCONTENTS, "multipart/form-data",
		CURLFORM_END);

	std::vector<std::string> postTokens;
	boost::split(postTokens, postData, boost::is_any_of("&"));

	for (std::vector<std::string>::iterator it = postTokens.begin(); it != postTokens.end(); ++it)
	{
		std::vector<std::string> tokens;
		boost::split(tokens, *it, boost::is_any_of("="));

		curl_formadd(&formpost, &lastptr,
			CURLFORM_COPYNAME, tokens[0].c_str(),
			CURLFORM_COPYCONTENTS, tokens[1].c_str(),
			CURLFORM_END);
	}

	curl_formadd(&formpost, &lastptr,
		CURLFORM_COPYNAME, fileFieldname.c_str(),
		CURLFORM_BUFFER, "data",
		CURLFORM_BUFFERPTR, contents.data(),
		CURLFORM_BUFFERLENGTH, contents.size(),
		CURLFORM_END);

	headerlist = curl_slist_append(headerlist, headerBuffer);

	curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
	curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
	curl_easy_setopt(curl, CURLOPT_COOKIEFILE, cookieFile.c_str());
	curl_easy_setopt(curl, CURLOPT_COOKIEJAR, cookieFile.c_str());

	int code = 0;
	curl_easy_perform(curl);
	curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
	curl_easy_cleanup(curl);
	curl_formfree(formpost);
	curl_slist_free_all(headerlist);

	if (code != 200)
	{
		std::stringstream error;
		error << "Error (" << code << ") encountered while retrieving " << url << "\n";
		throw std::runtime_error(error.str());
	}
}

size_t HttpClient::WriteCallback(char* data, size_t size, size_t nmemb, std::string* writerData)
{
	if (writerData == nullptr)
		return size * nmemb;

	writerData->append(data, size * nmemb);
	return size * nmemb;
}

} // namespace Util
} // namespace PresenceDetection