sslclient.cpp Example File

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 #include "certificateinfo.h"
 #include "sslclient.h"
 #include "ui_sslclient.h"
 #include "ui_sslerrors.h"

 #include <QtWidgets/QScrollBar>
 #include <QtWidgets/QStyle>
 #include <QtWidgets/QToolButton>
 #include <QtNetwork/QSslCipher>

 SslClient::SslClient(QWidget *parent)
     : QWidget(parent), socket(0), padLock(0), executingDialog(false)
 {
     form = new Ui_Form;
     form->setupUi(this);
     form->hostNameEdit->setSelection(0, form->hostNameEdit->text().size());
     form->sessionOutput->setHtml(tr("&lt;not connected&gt;"));

     connect(form->hostNameEdit, SIGNAL(textChanged(QString)),
             this, SLOT(updateEnabledState()));
     connect(form->connectButton, SIGNAL(clicked()),
             this, SLOT(secureConnect()));
     connect(form->sendButton, SIGNAL(clicked()),
             this, SLOT(sendData()));
 }

 SslClient::~SslClient()
 {
     delete form;
 }

 void SslClient::updateEnabledState()
 {
     bool unconnected = !socket || socket->state() == QAbstractSocket::UnconnectedState;

     form->hostNameEdit->setReadOnly(!unconnected);
     form->hostNameEdit->setFocusPolicy(unconnected ? Qt::StrongFocus : Qt::NoFocus);

     form->hostNameLabel->setEnabled(unconnected);
     form->portBox->setEnabled(unconnected);
     form->portLabel->setEnabled(unconnected);
     form->connectButton->setEnabled(unconnected && !form->hostNameEdit->text().isEmpty());

     bool connected = socket && socket->state() == QAbstractSocket::ConnectedState;
     form->sessionOutput->setEnabled(connected);
     form->sessionInput->setEnabled(connected);
     form->sessionInputLabel->setEnabled(connected);
     form->sendButton->setEnabled(connected);
 }

 void SslClient::secureConnect()
 {
     if (!socket) {
         socket = new QSslSocket(this);
         connect(socket, SIGNAL(stateChanged(QAbstractSocket::SocketState)),
                 this, SLOT(socketStateChanged(QAbstractSocket::SocketState)));
         connect(socket, SIGNAL(encrypted()),
                 this, SLOT(socketEncrypted()));
         connect(socket, SIGNAL(sslErrors(QList<QSslError>)),
                 this, SLOT(sslErrors(QList<QSslError>)));
         connect(socket, SIGNAL(readyRead()),
                 this, SLOT(socketReadyRead()));
     }

     socket->connectToHostEncrypted(form->hostNameEdit->text(), form->portBox->value());
     updateEnabledState();
 }

 void SslClient::socketStateChanged(QAbstractSocket::SocketState state)
 {
     if (executingDialog)
         return;

     updateEnabledState();
     if (state == QAbstractSocket::UnconnectedState) {
         form->hostNameEdit->setPalette(QPalette());
         form->hostNameEdit->setFocus();
         form->cipherLabel->setText(tr("<none>"));
         if (padLock)
             padLock->hide();
         socket->deleteLater();
         socket = 0;
     }
 }

 void SslClient::socketEncrypted()
 {
     if (!socket)
         return;                 // might have disconnected already

     form->sessionOutput->clear();
     form->sessionInput->setFocus();

     QPalette palette;
     palette.setColor(QPalette::Base, QColor(255, 255, 192));
     form->hostNameEdit->setPalette(palette);

     QSslCipher ciph = socket->sessionCipher();
     QString cipher = QString("%1, %2 (%3/%4)").arg(ciph.authenticationMethod())
                      .arg(ciph.name()).arg(ciph.usedBits()).arg(ciph.supportedBits());;
     form->cipherLabel->setText(cipher);

     if (!padLock) {
         padLock = new QToolButton;
         padLock->setIcon(QIcon(":/encrypted.png"));
 #ifndef QT_NO_CURSOR
         padLock->setCursor(Qt::ArrowCursor);
 #endif
         padLock->setToolTip(tr("Display encryption details."));

         int extent = form->hostNameEdit->height() - 2;
         padLock->resize(extent, extent);
         padLock->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Ignored);

         QHBoxLayout *layout = new QHBoxLayout(form->hostNameEdit);
         layout->setMargin(form->hostNameEdit->style()->pixelMetric(QStyle::PM_DefaultFrameWidth));
         layout->setSpacing(0);
         layout->addStretch();
         layout->addWidget(padLock);

         form->hostNameEdit->setLayout(layout);

         connect(padLock, SIGNAL(clicked()),
                 this, SLOT(displayCertificateInfo()));
     } else {
         padLock->show();
     }
 }

 void SslClient::socketReadyRead()
 {
     appendString(QString::fromUtf8(socket->readAll()));
 }

 void SslClient::sendData()
 {
     QString input = form->sessionInput->text();
     appendString(input + '\n');
     socket->write(input.toUtf8() + "\r\n");
     form->sessionInput->clear();
 }

 void SslClient::sslErrors(const QList<QSslError> &errors)
 {
     QDialog errorDialog(this);
     Ui_SslErrors ui;
     ui.setupUi(&errorDialog);
     connect(ui.certificateChainButton, SIGNAL(clicked()),
             this, SLOT(displayCertificateInfo()));

     foreach (const QSslError &error, errors)
         ui.sslErrorList->addItem(error.errorString());

     executingDialog = true;
     if (errorDialog.exec() == QDialog::Accepted)
         socket->ignoreSslErrors();
     executingDialog = false;

     // did the socket state change?
     if (socket->state() != QAbstractSocket::ConnectedState)
         socketStateChanged(socket->state());
 }

 void SslClient::displayCertificateInfo()
 {
     CertificateInfo *info = new CertificateInfo(this);
     info->setCertificateChain(socket->peerCertificateChain());
     info->exec();
     info->deleteLater();
 }

 void SslClient::appendString(const QString &line)
 {
     QTextCursor cursor(form->sessionOutput->textCursor());
     cursor.movePosition(QTextCursor::End);
     cursor.insertText(line);
     form->sessionOutput->verticalScrollBar()->setValue(form->sessionOutput->verticalScrollBar()->maximum());
 }