httpcomms.cpp

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#include <iostream>
using namespace std;

#include <QCoreApplication>
#include <QRegExp>
#include <QTimer>
#include <QFile>

#include "mythlogging.h"
#include "compat.h"
#include "mcodecs.h"
#include "httpcomms.h"

HttpComms::HttpComms()
         : http(0)
{
    init();
}


HttpComms::HttpComms(QUrl &url, int timeoutms)
         : http(0)
{
    init();
    request(url, timeoutms);
}

HttpComms::HttpComms(QUrl &url, QHttpRequestHeader &header, int timeoutms)
{
    init();
    request(url, header, timeoutms);
}

HttpComms::~HttpComms()
{
    if (m_timer)
    {
        m_timer->disconnect();
        m_timer->deleteLater();
        m_timer = NULL;
    }

    delete http;
}

void HttpComms::init()
{
 //   m_curRequest = NULL;
    m_authNeeded = false;
    http = new QHttp();
    m_done = false;
    m_statusCode = 0;
    m_timer = NULL;
    m_timeout = false;
    m_progress = m_total = 0;


    connect(http, SIGNAL(done(bool)), this, SLOT(done(bool)));
    connect(http, SIGNAL(stateChanged(int)), this, SLOT(stateChanged(int)));
    connect(http, SIGNAL(responseHeaderReceived(const QHttpResponseHeader &)),
            this, SLOT(headerReceived(const QHttpResponseHeader &)));
    connect(http, SIGNAL(dataReadProgress(int, int)), this, SLOT(dataReadProgress(int, int)));

}

void HttpComms::request(QUrl &url, int timeoutms, bool allowGzip)
{
    QString path = url.path();

    if (url.hasQuery())
        path += '?' + url.encodedQuery();

    QHttpRequestHeader header("GET", path);
    QString userAgent = "Mozilla/9.876 (X11; U; Linux 2.2.12-20 i686, en) "
                        "Gecko/25250101 Netscape/5.432b1";

    header.setValue("Host", url.host());
    header.setValue("User-Agent", userAgent);

    if (allowGzip)
        header.setValue( "Accept-Encoding", "gzip");

    request(url, header, timeoutms);
}



void HttpComms::request(QUrl               &url,
                        QHttpRequestHeader &header,
                        int                 timeoutms,
                        QIODevice          *pData /* = NULL*/ )
{
    quint16 port = 80;

    if (url.port() != -1)
        port = url.port();

    http->setHost(url.host(), port);

    m_url = url.toString();
    m_curRequest = header;

    if (m_timer)
        m_timer->stop();

    if (timeoutms > 0 )
    {
        if (!m_timer)
        {
            m_timer = new QTimer();
            connect(m_timer, SIGNAL(timeout()), SLOT(timeout()));
        }
        m_timeoutInterval = timeoutms;
        m_timer->setSingleShot(true);
        m_timer->start(timeoutms);
    }

    if (!m_cookie.isEmpty())
    {
        header.setValue("Cookie", m_cookie);
    }

    http->request(header, pData);
}

void HttpComms::stop()
{
    disconnect(http, 0, 0, 0);
    http->abort();

    if (m_timer)
        m_timer->stop();
}

void HttpComms::done(bool error)
{
    if (error)
    {
       LOG(VB_GENERAL, LOG_ERR,
           QString("NetworkOperation Error on Finish: %1 (%2): url: '%3'")
           .arg(http->errorString()) .arg(error) .arg(m_url.toString()));
    }
    else if (m_authNeeded)
    {
        LOG(VB_NETWORK, LOG_ERR, QString("Authentication pending, ignoring "
                                         "done from first request."));
        return;
    }
    else if (http->bytesAvailable())
    {
        m_data.resize(http->bytesAvailable());
        m_data = http->readAll();
    }

    LOG(VB_NETWORK, LOG_DEBUG, QString("done: %1 bytes").arg(m_data.size()));

    if (m_timer)
        m_timer->stop();

    m_done = true;
}

void HttpComms::stateChanged(int state)
{
    QString stateStr;

    switch (state)
    {
        case QHttp::Unconnected: stateStr = "unconnected"; break;
        case QHttp::HostLookup: stateStr =  "host lookup"; break;
        case QHttp::Connecting: stateStr = "connecting"; break;
        case QHttp::Sending: stateStr = "sending"; break;
        case QHttp::Reading: stateStr = "reading"; break;
        case QHttp::Connected: stateStr =  "connected"; break;
        case QHttp::Closing: stateStr = "closing"; break;
        default: stateStr =  "unknown state: "; break;
    }

    LOG(VB_NETWORK, LOG_DEBUG, QString("HttpComms::stateChanged: %1 (%2)")
                                .arg(stateStr)
                                .arg(state));
}

void HttpComms::headerReceived(const QHttpResponseHeader &resp)
{
    m_statusCode = resp.statusCode();
    m_responseReason = resp.reasonPhrase();

    QString sidkey = "set-cookie";

    if (resp.hasKey(sidkey))
    {
        QRegExp rx("PHPSESSID=(.+);");
        rx.setMinimal(true);
        rx.setCaseSensitivity(Qt::CaseInsensitive);
        if (rx.indexIn(resp.value(sidkey)) >= 0)
        {
            m_cookie = "PHPSESSID=" + rx.cap(1);
            LOG(VB_NETWORK, LOG_DEBUG,
                QString("HttpComms found cookie: %1").arg(m_cookie));
        }
    }


    LOG(VB_NETWORK, LOG_DEBUG, QString("Got HTTP response: %1:%2")
                        .arg(m_statusCode)
                        .arg(m_responseReason));
    LOG(VB_NETWORK, LOG_DEBUG, QString("Keys: %1")
                        .arg(resp.keys().join(",") ));


    if (resp.statusCode() >= 300 && resp.statusCode() <= 400)
    {
        // redirection
        QString uri = resp.value("LOCATION");
        LOG(VB_NETWORK, LOG_DEBUG, QString("Redirection to: '%1'").arg(uri));

        m_redirectedURL = resp.value("LOCATION");
        m_authNeeded = false;
    }
    else if ((resp.statusCode() == 401))
    {
        // Toggle the state of our authentication pending flag
        // if we've gotten this after having tried to authenticate
        // once then we've failed authentication and turning the pending off will allow us to exit.
        m_authNeeded = !m_authNeeded;
        if (m_authNeeded)
        {
            QString authHeader(resp.value("www-authenticate"));

            if (authHeader.startsWith("Digest") )
            {
                if (!createDigestAuth(false, authHeader, &m_curRequest) )
                {
                    m_authNeeded = false;
                    return;
                }
            }
            else
            {
                QString sUser(m_webCredentials.user + ':' + m_webCredentials.pass);
                QByteArray auth = QCodecs::base64Encode(sUser.toLocal8Bit());
                m_curRequest.setValue( "Authorization", QString( "Basic " ).append( auth ) );
            }

            if (m_timer)
            {
                m_timer->stop();
                m_timer->setSingleShot(true);
                m_timer->start(m_timeoutInterval);
            }

            // Not sure if it's possible to receive a session ID or other cookie
            // before authenticating or not.
            if (!m_cookie.isEmpty())
            {
                m_curRequest.setValue("Cookie", m_cookie);
            }

            http->request(m_curRequest);
        }
    }
    else
    {
        m_authNeeded = false;
    }
}

void HttpComms::timeout()
{
   LOG(VB_GENERAL, LOG_ERR, QString("HttpComms::Timeout for url: %1")
                                .arg(m_url.toString()));
   m_timeout = true;
   m_done = true;
}

void HttpComms::dataReadProgress(int done, int total)
{
   m_progress = done;
   m_total = total;
}


QString HttpComms::getHttp(QString     &url,
                           int          timeoutMS,    int  maxRetries,
                           int          maxRedirects, bool allowGzip,
                           Credentials *webCred,      bool isInQtEventThread)
{
    int redirectCount = 0;
    int timeoutCount = 0;
    QString res;
    HttpComms *httpGrabber = NULL;
    QString hostname;

    while (1)
    {
        QUrl qurl(url);
        if (hostname.isEmpty())
            hostname = qurl.host();  // hold onto original host
        if (qurl.host().isEmpty())   // can occur on redirects to partial paths
            qurl.setHost(hostname);

        LOG(VB_NETWORK, LOG_DEBUG,
            QString("getHttp: grabbing: %1").arg(qurl.toString()));

        delete httpGrabber;

        httpGrabber = new HttpComms;

        if (webCred)
            httpGrabber->setCredentials(*webCred, CRED_WEB);

        httpGrabber->request(qurl, timeoutMS, allowGzip);


        while (!httpGrabber->isDone())
        {
            if (isInQtEventThread)
                qApp->processEvents();
            usleep(10000);
        }

        // Handle timeout
        if (httpGrabber->isTimedout())
        {
            LOG(VB_NETWORK, LOG_INFO, QString("timeout for url: %1").arg(url));

            // Increment the counter and check we're not over the limit
            if (timeoutCount++ >= maxRetries)
            {
                LOG(VB_GENERAL, LOG_ERR,
                    QString("Failed to contact server for url: %1").arg(url));
                break;
            }

            // Try again
            LOG(VB_NETWORK, LOG_DEBUG, QString("Attempt # %1/%2 for url: %3")
                                        .arg(timeoutCount + 1)
                                        .arg(maxRetries)
                                        .arg(url));

            continue;
        }

        // Check for redirection
        if (!httpGrabber->getRedirectedURL().isEmpty())
        {
            LOG(VB_NETWORK, LOG_DEBUG,
                QString("Redirection: %1, count: %2, max: %3")
                                .arg(httpGrabber->getRedirectedURL())
                                .arg(redirectCount)
                                .arg(maxRedirects));

            // Increment the counter and check we're not over the limit
            if (redirectCount++ >= maxRedirects)
            {
                LOG(VB_GENERAL, LOG_ERR,
                    QString("Maximum redirections reached for url: %1")
                        .arg(url));
                break;
            }

            url = httpGrabber->getRedirectedURL();

            // Try again
            timeoutCount = 0;
            continue;
        }

        res = httpGrabber->getData();
        break;
    }

    delete httpGrabber;

    LOG(VB_NETWORK, LOG_DEBUG, QString("Got %1 bytes from url: '%2'")
                                .arg(res.length())
                                .arg(url));
    LOG(VB_NETWORK, LOG_DEBUG, res);

    return res;
}

// getHttpFile - static function for grabbing a file from a http url
//      this is a synchronous function, it will block according to the vars
bool HttpComms::getHttpFile(const QString& filename, QString& url, int timeoutMS,
                            int maxRetries, int maxRedirects,
                            bool allowGzip, Credentials* webCred)
{
    int redirectCount = 0;
    int timeoutCount = 0;
    QByteArray data(0);
    bool res = false;
    HttpComms *httpGrabber = NULL;
    QString hostname;

    while (1)
    {
        QUrl qurl(url);
        if (hostname.isEmpty())
            hostname = qurl.host();  // hold onto original host

        if (qurl.host().isEmpty())   // can occur on redirects to partial paths
            qurl.setHost(hostname);

        LOG(VB_NETWORK, LOG_DEBUG, QString("getHttp: grabbing: '%1'")
                                    .arg(qurl.toString()));

        delete httpGrabber;

        httpGrabber = new HttpComms;

        if (webCred)
            httpGrabber->setCredentials(*webCred, CRED_WEB);

        httpGrabber->request(qurl, timeoutMS, allowGzip);

        while (!httpGrabber->isDone())
        {
            qApp->processEvents();
            usleep(10000);
        }

        int statusCode = httpGrabber->getStatusCode();
        if (statusCode < 200 || statusCode > 401)
        {
            LOG(VB_GENERAL, LOG_ERR,
                QString("Server returned an error status code %1 for url: %2")
                                            .arg(statusCode)
                                            .arg(url));
            break;
        }

        // Handle timeout
        if (httpGrabber->isTimedout())
        {
            LOG(VB_NETWORK, LOG_DEBUG, QString("Timeout for url: '%1'")
                                        .arg(url));

            // Increment the counter and check we're not over the limit
            if (timeoutCount++ >= maxRetries)
            {
                LOG(VB_GENERAL, LOG_ERR,
                    QString("Failed to contact server for url: '%1'")
                                              .arg(url));
                break;
            }

            // Try again
            LOG(VB_NETWORK, LOG_DEBUG, QString("Attempt # %1/%2 for url: %3")
                                        .arg(timeoutCount + 1)
                                        .arg(maxRetries)
                                        .arg(url));

            continue;
        }

        // Check for redirection
        if (!httpGrabber->getRedirectedURL().isEmpty())
        {
            LOG(VB_NETWORK, LOG_DEBUG,
                QString("redirection: '%1', count: %2, max: %3")
                                        .arg(httpGrabber->getRedirectedURL())
                                        .arg(redirectCount)
                                        .arg(maxRedirects));

            // Increment the counter and check we're not over the limit
            if (redirectCount++ >= maxRedirects)
            {
                LOG(VB_GENERAL, LOG_ERR,
                    QString("Maximum redirections reached for url: %1")
                        .arg(url));
                break;
            }

            url = httpGrabber->getRedirectedURL();

            // Try again
            timeoutCount = 0;
            continue;
        }

        data = httpGrabber->getRawData();

        if (data.size() > 0)
        {
            LOG(VB_NETWORK, LOG_DEBUG,
                QString("getHttpFile: saving to file: '%1'") .arg(filename));

            QFile file(filename);
            if (file.open( QIODevice::WriteOnly ))
            {
                QDataStream stream(& file);
                stream.writeRawData((const char*)(data), data.size() );
                file.close();
                res = true;
                LOG(VB_NETWORK, LOG_DEBUG,
                    QString("getHttpFile: File saved OK"));
            }
            else
                LOG(VB_NETWORK, LOG_DEBUG,
                    "getHttpFile: Failed to open file for writing");
        }
        else
           LOG(VB_NETWORK, LOG_DEBUG, "getHttpFile: nothing to save to file!");

        break;
    }

    LOG(VB_NETWORK, LOG_DEBUG, QString("Got %1 bytes from url: '%2'")
                                .arg(data.size()) .arg(url));

    delete httpGrabber;

    return res;
}

QString HttpComms::postHttp(
    QUrl               &url,
    QHttpRequestHeader *pAddlHdr,     QIODevice *pData,
    int                 timeoutMS,    int        maxRetries,
    int                 maxRedirects, bool       allowGzip,
    Credentials        *webCred,      bool       isInQtEventThread,
    QString             userAgent)
{
    int redirectCount = 0;
    int timeoutCount = 0;
    QString res;
    HttpComms *httpGrabber = NULL;
    QString hostname;

    QHttpRequestHeader header("POST", url.path() + url.encodedQuery());

    // Add main header values
    header.setValue("Host", url.host());

    if (userAgent.toLower() == "<default>")
    {
        userAgent = "Mozilla/9.876 (X11; U; Linux 2.2.12-20 i686, en) "
            "Gecko/25250101 Netscape/5.432b1";
    }
    if (!userAgent.isEmpty())
        header.setValue("User-Agent", userAgent);

    if (allowGzip)
        header.setValue( "Accept-Encoding", "gzip");

    // Merge any Additional Headers passed by caller.

    if (pAddlHdr)
    {
        QList< QPair< QString, QString > > values = pAddlHdr->values();

        for (QList< QPair< QString, QString > >::iterator it  = values.begin();
                                                          it != values.end();
                                                        ++it )
        {
            header.setValue( (*it).first, (*it).second );
        }
    }

    while (1)
    {
        if (hostname.isEmpty())
            hostname = url.host();  // hold onto original host
        if (url.host().isEmpty())   // can occur on redirects to partial paths
            url.setHost(hostname);

        LOG(VB_NETWORK, LOG_DEBUG,
            QString("postHttp: grabbing: %1").arg(url.toString()));

        delete httpGrabber;

        httpGrabber = new HttpComms;

        if (webCred)
            httpGrabber->setCredentials(*webCred, CRED_WEB);

        httpGrabber->request(url, header, timeoutMS, pData );

        while (!httpGrabber->isDone())
        {
            if (isInQtEventThread)
                qApp->processEvents();
            usleep(10000);
        }

        // Handle timeout
        if (httpGrabber->isTimedout())
        {
            LOG(VB_NETWORK, LOG_DEBUG,
                QString("timeout for url: %1").arg(url.toString()));

            // Increment the counter and check we're not over the limit
            if (timeoutCount++ >= maxRetries)
            {
                LOG(VB_GENERAL, LOG_ERR,
                    QString("Failed to contact server for url: %1")
                        .arg(url.toString()));
                break;
            }

            // Try again
            LOG(VB_NETWORK, LOG_DEBUG, QString("Attempt # %1/%2 for url: %3")
                                        .arg(timeoutCount + 1)
                                        .arg(maxRetries)
                                        .arg(url.toString()));

            continue;
        }

        // Check for redirection
        if (!httpGrabber->getRedirectedURL().isEmpty())
        {
            LOG(VB_NETWORK, LOG_DEBUG,
                QString("Redirection: %1, count: %2, max: %3")
                                .arg(httpGrabber->getRedirectedURL())
                                .arg(redirectCount)
                                .arg(maxRedirects));

            // Increment the counter and check we're not over the limit
            if (redirectCount++ >= maxRedirects)
            {
                LOG(VB_GENERAL, LOG_ERR,
                    QString("Maximum redirections reached for url: %1")
                        .arg(url.toString()));
                break;
            }

            url = QUrl( httpGrabber->getRedirectedURL() );

            // Try again
            timeoutCount = 0;
            continue;
        }

        res = httpGrabber->getData();
        break;
    }

    delete httpGrabber;

    LOG(VB_NETWORK, LOG_DEBUG, QString("Got %1 bytes from url: '%2'")
                                .arg(res.length())
                                .arg(url.toString()));
    LOG(VB_NETWORK, LOG_DEBUG, res);

    return res;
}


bool HttpComms::createDigestAuth ( bool isForProxy, const QString& authStr, QHttpRequestHeader* request)
{
    const char *p;
    QString header;
    QString auth;
    QByteArray opaque;
    QByteArray Response;

    DigestAuthInfo info;

    opaque = "";

    if ( isForProxy )
    {
        header = "Proxy-Authorization";
        auth = "Digest ";
        info.username = qPrintable(m_proxyCredentials.user);
        info.password = qPrintable(m_proxyCredentials.pass);
        p = qPrintable(authStr);
    }
    else
    {
        header = "Authorization";
        auth = "Digest ";
        info.username = qPrintable(m_webCredentials.user);
        info.password = qPrintable(m_webCredentials.pass);
        p = qPrintable(authStr);
    }

    if (!p || !*p)
        return false;

    p += 6; // Skip "Digest"

    if ( info.username.isEmpty() || info.password.isEmpty() || !p )
        return false;


    info.realm = "";
    info.algorithm = "MD5";
    info.nonce = "";
    info.qop = "";

    // cnonce is recommended to contain about 64 bits of entropy
    // TODO: Fix this
    info.cnonce =  "QPDExMTQ";

    // HACK: Should be fixed according to RFC 2617 section 3.2.2
    info.nc = "00000001";

    // Set the method used...
    info.method.clear();
    info.method += request->method();

    // Parse the Digest response....
    while (*p)
    {
        int i = 0;
        while ( (*p == ' ') || (*p == ',') || (*p == '\t')) {p++;}

        if (strncasecmp(p, "realm=", 6 )==0)
        {
            p+=6;
            while ( *p == '"' ) p++;  // Go past any number of " mark(s) first
            while ( p[i] != '"' ) i++;  // Read everything until the last " mark
            info.realm = QByteArray( p, i+1 );
        }
        else if (strncasecmp(p, "algorith=", 9)==0)
        {
            p+=9;
            while ( *p == '"' ) p++;  // Go past any number of " mark(s) first
            while ( ( p[i] != '"' ) && ( p[i] != ',' ) && ( p[i] != '\0' ) ) i++;
            info.algorithm = QByteArray(p, i+1);
        }
        else if (strncasecmp(p, "algorithm=", 10)==0)
        {
            p+=10;
            while ( *p == '"' ) p++;  // Go past any " mark(s) first
            while ( ( p[i] != '"' ) && ( p[i] != ',' ) && ( p[i] != '\0' ) ) i++;
            info.algorithm = QByteArray(p,i+1);
        }
        else if (strncasecmp(p, "domain=", 7)==0)
        {
            p+=7;
            while ( *p == '"' ) p++;  // Go past any " mark(s) first
            while ( p[i] != '"' ) i++;  // Read everything until the last " mark
            int pos;
            int idx = 0;
            QByteArray uri = QByteArray(p,i+1);
            do
            {
                pos = uri.indexOf( ' ', idx );

                if ( pos != -1 )
                {
                    QString sUrl = m_url.toString() + "//" + uri.mid(idx, pos-idx);
                    QUrl u(sUrl);
                    if (u.isValid ())
                        info.digestURI.append(qPrintable(u.toString()));
                }
                else
                {
                    QString sUrl = m_url.toString() + "//" + uri.mid(idx, uri.length()-idx);
                    QUrl u(sUrl);
                    if (u.isValid ())
                        info.digestURI.append(qPrintable(u.toString()));
                }
                idx = pos+1;
            } while ( pos != -1 );
        }
        else if (strncasecmp(p, "nonce=", 6)==0)
        {
            p+=6;
            while ( *p == '"' ) p++;  // Go past any " mark(s) first
            while ( p[i] != '"' ) i++;  // Read everything until the last " mark
            info.nonce = QByteArray(p,i+1);
        }
        else if (strncasecmp(p, "opaque=", 7)==0)
        {
            p+=7;
            while ( *p == '"' ) p++;  // Go past any " mark(s) first
            while ( p[i] != '"' ) i++;  // Read everything until the last " mark
            opaque = QByteArray(p,i+1);
        }
        else if (strncasecmp(p, "qop=", 4)==0)
        {
            p+=4;
            while ( *p == '"' ) p++;  // Go past any " mark(s) first
            while ( p[i] != '"' ) i++;  // Read everything until the last " mark
            info.qop = QByteArray(p,i+1);
        }
        p+=(i+1);
    }

    if (info.realm.isEmpty() || info.nonce.isEmpty())
        return false;

    info.digestURI.append (m_url.path() + m_url.encodedQuery());

#if 0
    LOG(VB_GENERAL, LOG_DEBUG, " RESULT OF PARSING:");
    LOG(VB_GENERAL, LOG_DEBUG, QString("   algorithm: ") .arg(info.algorithm));
    LOG(VB_GENERAL, LOG_DEBUG, QString("   realm:     ") .arg(info.realm));
    LOG(VB_GENERAL, LOG_DEBUG, QString("   nonce:     ") .arg(info.nonce));
    LOG(VB_GENERAL, LOG_DEBUG, QString("   opaque:    ") .arg(opaque));
    LOG(VB_GENERAL, LOG_DEBUG, QString("   qop:       ") .arg(info.qop));
#endif

    // Calculate the response...
    calculateDigestResponse( info, Response );

    auth += "username=\"";
    auth += info.username;

    auth += "\", realm=\"";
    auth += info.realm;
    auth += "\"";

    auth += ", nonce=\"";
    auth += info.nonce;

    auth += "\", uri=\"";
    auth += m_url.path() + m_url.encodedQuery();

    auth += "\", algorithm=\"";
    auth += info.algorithm;
    auth +="\"";

    if ( !info.qop.isEmpty() )
    {
        auth += ", qop=\"";
        auth += info.qop;
        auth += "\", cnonce=\"";
        auth += info.cnonce;
        auth += "\", nc=";
        auth += info.nc;
    }

    auth += ", response=\"";
    auth += Response;
    if ( !opaque.isEmpty() )
    {
        auth += "\", opaque=\"";
        auth += opaque;
    }

    auth += "\"";

    LOG(VB_NETWORK, LOG_DEBUG, QString("Setting auth header %1 to '%2'")
                                .arg(header).arg(auth));

    if (request)
        request->setValue(header, auth);

    return true;
}


void HttpComms::calculateDigestResponse( DigestAuthInfo& info, QByteArray& Response )
{
    QMD5 md;
    QByteArray HA1;
    QByteArray HA2;

    // Calculate H(A1)
    QByteArray authStr = info.username;
    authStr += ':';
    authStr += info.realm;
    authStr += ':';
    authStr += info.password;
    md.update( authStr );

    if (info.algorithm.toLower() == "md5-sess" )
    {
        authStr = md.hexDigest();
        authStr += ':';
        authStr += info.nonce;
        authStr += ':';
        authStr += info.cnonce;
        md.reset();
        md.update( authStr );
    }

    HA1 = md.hexDigest();

#if 0
    LOG(VB_GENERAL, LOG_DEBUG, QString(" calculateResponse(): A1 => %1")
                                   .arg(HA1));
#endif

    QString sEncodedPathAndQuery = m_url.path() + m_url.encodedQuery();

    // Calculate H(A2)
    authStr = info.method;
    authStr += ':';
    authStr += qPrintable(sEncodedPathAndQuery);

    if ( info.qop == "auth-int" )
    {
        authStr += ':';
        authStr += info.entityBody;
    }

    md.reset();
    md.update( authStr );
    HA2 = md.hexDigest();

#if 0
    LOG(VB_GENERAL, LOG_DEBUG, QString(" calculateResponse(): A2 => %1")
                                   .arg(HA2));
#endif

    // Calculate the response.
    authStr = HA1;
    authStr += ':';
    authStr += info.nonce;
    authStr += ':';
    if ( !info.qop.isEmpty() )
    {
        authStr += info.nc;
        authStr += ':';
        authStr += info.cnonce;
        authStr += ':';
        authStr += info.qop;
        authStr += ':';
    }

    authStr += HA2;
    md.reset();
    md.update( authStr );
    Response = md.hexDigest();

#if 0
    LOG(VB_GENERAL, LOG_DEBUG. QString(" calculateResponse(): Response => %1")
                                   .arg(Response));
#endif
}