Introduced HTTPHelper class to easily perform HTTP operations within services.

[bpdyndnsd] / src / httphelper.cpp

/** @file
 * @brief HTTPHelper class implementation. This class represents a Helper to perform HTTP operations easily.
 *
 *
 *
 * @copyright Intra2net AG
 * @license GPLv2
*/

#include "httphelper.h"

HTTPHelper::HTTPHelper()
    : Proxy("")
    , ProxyPort(0)
    , Log(new Logger)
{
}

HTTPHelper::HTTPHelper(Logger::Ptr _log, string _proxy, int _proxy_port)
{
    Log = _log;
    Proxy = _proxy;
    ProxyPort = _proxy_port;
    CurlEasyHandle = init_curl(CurlWritedataBuff, CurlErrBuff);
}


HTTPHelper::~HTTPHelper()
{
}



/**
 * Perform a HTTP GET operation
 * @param url URL for HTTP GET operation
 * @return The data GET from the URL
 */
string HTTPHelper::http_get(const string& url)
{
    int curl_err_code;

    set_curl_url(url);

    if ( (curl_err_code = curl_easy_perform(CurlEasyHandle) ) != 0 )
    {
        // TODO: Logging errors
        return "";
    }
    // Operation performed without any problems so we can return the CurlWritedataBuff
    return CurlWritedataBuff;
}


/**
 * Initialized curl easy handle with a few options.
 * @param curl_writedata_buff Reference to a string wich will be filled with the curl result
 * @param curl_err_buff A pointer to an char array which will be filled with error message.
 * @return A pointer to the easy curl handle.
 */
CURL* HTTPHelper::init_curl(string& curl_writedata_buff,char* curl_err_buff) const
{
    CURL *curl_easy_handle = curl_easy_init();

    curl_easy_setopt(curl_easy_handle,CURLOPT_NOPROGRESS,1);
    curl_easy_setopt(curl_easy_handle,CURLOPT_CONNECTTIMEOUT,5);
    curl_easy_setopt(curl_easy_handle,CURLOPT_TIMEOUT,10);
    curl_easy_setopt(curl_easy_handle,CURLOPT_BUFFERSIZE,1024);
    curl_easy_setopt(curl_easy_handle,CURLOPT_ERRORBUFFER,curl_err_buff);
    curl_easy_setopt(curl_easy_handle,CURLOPT_WRITEFUNCTION,http_receive);
    curl_easy_setopt(curl_easy_handle,CURLOPT_WRITEDATA,&curl_writedata_buff);

    if ( !Proxy.empty() )
    {
        curl_easy_setopt(curl_easy_handle,CURLOPT_PROXY,Proxy.c_str());
        curl_easy_setopt(curl_easy_handle,CURLOPT_PROXYPORT,ProxyPort);
    }

    return curl_easy_handle;
}


/**
 * Sets a url to the easy curl handle
 * @param url The url to set.
 */
void HTTPHelper::set_curl_url(const string& url)
{
    curl_easy_setopt(CurlEasyHandle,CURLOPT_URL,url.c_str());
}


/**
 * Callback Function is called every time CURL is receiving data from HTTPS-Server and will copy all received Data to the given stream pointer
 * @param inBuffer Pointer to input.
 * @param size How many mem blocks are received
 * @param nmemb size of each memblock
 * @param outBuffer Pointer to output stream.
 * @return The size received.
 */
int HTTPHelper::http_receive( char *inBuffer, size_t size, size_t nmemb, string *outBuffer )
{
    outBuffer->append(inBuffer);
    return (size*nmemb);
}