QT HTTP當服務器需要cookies時發佈問題

Question

我一直在嘗試這一整天都沒有成功。請幫助解決問題。在谷歌搜索我發現很多用戶有這個問題，但我找不到解決方案。

我試圖做的HTTP發佈的QT C++ &我已經嘗試這樣做，在python （我的問題是不是一個Python的問題，所以Qt的利弊請幫助）..我知道，我在什麼地方錯了處理餅乾和所有，所以請幫助。請提供可能的解決方案。

在python中，代碼乾淨簡單。我已經剝離了錯誤處理和所有額外的東西，使其變得簡單。

url = 'http://www.example.com/' 
data = 'username=abc&password=passwd' 
cj = cookielib.CookieJar() 
opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj)) 
usock = opener.open(url, data) 
#>>>>>> NOW, I have the cookiejar <<<<<<<<< 

opener.addheaders = [('Referer','http://www.example.com/xyz.php'),('User-Agent','Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.3) Gecko/20091020 Ubuntu/9.10 (karmic) Firefox/3.5.3 GTB7.0')] 
data_to_send = 'ABCDEFGH' 
url_send = "http://www.example.com/xyz.php" 
send = opener.open(url_send,data_to_send) 

的QT相當於我做： -

void SmsSender::sendToMyCantos() 
{ 
    manager = new QNetworkAccessManager(this); 
    manager->setCookieJar(new QNetworkCookieJar(manager)); 
    connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(replyFinished(QNetworkReply*))); 
    request.setUrl(QUrl("http://www.mycantos.com")); 
    postData.append("username=abc&password=passwd"); 
    manager->post(request,postData); 
    //>>>>>> So, I feel that I have CookieJar now to make POST <<<<<<< 

    request.setRawHeader("Referer","http://www.example.com/xyz.php"); 
    request.setRawHeader("User-Agent","Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.3) Gecko/20091020 Ubuntu/9.10 (karmic) Firefox/3.5.3 GTB7.0"); 

    postData.clear(); 
    postData.append("ABCDEFGH"); 
    request.setUrl(QUrl("http://www.example.com/xyz.php")); 

    manager->post(request,postData); 
} 

現在的問題是，我不能做同樣的QT。問題我面對：

1. 處理Cookie
2. 處理重定向（HTTP 302）
3. 保留cookie來使未來的POST

這一切都是自動的蟒蛇做。 下面的代碼是沒有直接關係，但我這個編碼，以便在POST重定向。該代碼是very similar to the link I used to make it..

QUrl SmsSender::redirectUrl(const QUrl& possibleRedirectUrl, 
           const QUrl& oldRedirectUrl) const { 
     //Checking infinite resursions 
     QUrl redirectUrl; 
     if(!possibleRedirectUrl.isEmpty() && 
      possibleRedirectUrl != oldRedirectUrl) { 
       redirectUrl = possibleRedirectUrl; 
     } 
     return redirectUrl; 
} 

void SmsSender::replyFinished(QNetworkReply *reply) 
{ 
    QVariant possibleRedirectUrl = 
      reply->attribute(QNetworkRequest::RedirectionTargetAttribute); 
    QVariant data_size = reply->header(QNetworkRequest::ContentLengthHeader); 
    qDebug()<<data_size.toFloat(); 
    qDebug()<<manager->cookieJar()->cookiesForUrl(QUrl("http://www.example.com")); 

    /* We'll deduct if the redirection is valid in the redirectUrl function */ 
    _urlRedirectedTo = this->redirectUrl(possibleRedirectUrl.toUrl(), 
             _urlRedirectedTo); 

    /* If the URL is not empty, we're being redirected. */ 
    if(!_urlRedirectedTo.isEmpty()) { 
      QString text = QString("SmsSender::replyFinished: Redirected to ") 
            .append(_urlRedirectedTo.toString()); 
    qDebug(text.toAscii()); 

    // Do again in case we have more redirections 

    this->_qnam->get(QNetworkRequest(_urlRedirectedTo)); 
    } 
    else 
    { 
     QString text = QString("SmsSender::replyFinished: Arrived to ") 
            .append(reply->url().toString()); 
     qDebug(text.toAscii()); 
     _urlRedirectedTo.clear(); 
    } 

} 

QNetworkAccessManager* SmsSender::createQNAM() { 
     QNetworkAccessManager* qnam = new QNetworkAccessManager(this); 
     /* We'll handle the finished reply in replyFinished */ 
     connect(qnam, SIGNAL(finished(QNetworkReply*)), 
       this, SLOT(replyFinished(QNetworkReply*))); 
     return qnam; 
} 

Answer 1

我用它來獲取一個cookie：

SomeDialog::SomeDialog(QWidget *parent) 
    : QDialog(parent) 
     , urlSearch("www.someotherurlyoumightneed.com") 
    , urlCookie("www.urltogetcookie.from") 
{ 
    ui.setupUi(this); 

    //manager is a QNetworkAccessManager 
    manager.setCookieJar(new QNetworkCookieJar); 
    connect(&manager, SIGNAL(finished(QNetworkReply*)), 
     SLOT(slotReplyFinished(QNetworkReply*))); 

    //this is a QNetworkRequest 
    //here i tell how the post methods are encoded 
    searchReq.setUrl(urlSearch); 
    searchReq.setHeader(QNetworkRequest::ContentTypeHeader,"application/x-www-form-urlencoded"); 

    //get cookie 
    manager.get(QNetworkRequest(urlCookie)); 
    lblStatus->setText("Getting cookie"); 
} 

void SomeDialog::slotReplyFinished(QNetworkReply* reply){ 
    reply->deleteLater(); 

    if(reply->error() != QNetworkReply::NoError){ 
     QMessageBox::warning(this,QString(), tr("Error while downloading information!\n%1").arg(reply->errorString())); 

     return; 
    } 

    //Here i check if there is a cookie for me in the reply and extract it 
    QList<QNetworkCookie> cookies = qvariant_cast<QList<QNetworkCookie>>(reply->header(QNetworkRequest::SetCookieHeader)); 
    if(cookies.count() != 0){ 
     //you must tell which cookie goes with which url 
     manager.cookieJar()->setCookiesFromUrl(cookies, urlSearch); 
    } 

    //here you can check for the 302 or whatever other header i need 
    QVariant newLoc = reply->header(QNetworkRequest::LocationHeader); 
    if(newLoc.isValid()){ 
     //if it IS a reloc header, get the url it points to 
     QUrl url(newLoc.toString()); 
     _req.setUrl(url); 
     _pendingReq.insert(_manager.get(_req)); 
     return; 
    } 

    //if you have multiple urls you are waiting for replys 
    //you can check which one this one belongs to with 
    if(reply->url() == urlSearch){ 
     //do something 
    } 
} 

void SomeDialog::slotSearch(){ 
    //Here we set the data needed for a post request 
    QList<QNetworkCookie> cookies = manager.cookieJar()->cookiesForUrl(urlSearch); 
    for(auto it = cookies.begin(); it != cookies.end(); ++it){ 
     searchReq.setHeader(QNetworkRequest::CookieHeader, QVariant::fromValue(*it)); 
    } 

    QUrl post; 
    post.addQueryItem("firstParameter", s); 
    post.addQueryItem("secondParameter", "O"); 
    QByteArray ba; 
    ba.remove(0,1); //must remove last & 

    searchReq.setUrl(urlSearch); 
    pendingReq.insert(manager.post(searchReq, ba)); 
} 

希望這有助於。

Answer 2

我覺得Cookie被鏈接到他們從所獲得的網址。因此，在第二次POST中使用不同的URL時，第一次POST中的cookies不會隨請求一起發送。