Allow deferring QWebEngineCertificateError handling

Introduce defer() method for halting URL load on certificate errors,
and methods for rejecting and ignoring these errors subsequently
in async manner.

[ChangeLog][QtWebEngineWidgets][QWebEngineCertificateError] New
methods for asynchronous decision on certificate error during load.

Fixes: QTBUG-55110
Change-Id: Ib23eb568862ccc360208922a6a581f8e7edc4a7e
Reviewed-by: Michael Brüning <michael.bruning@qt.io>

1 files changed, 27 insertions, 15 deletions

diff --git a/examples/webenginewidgets/simplebrowser/webpage.cpp b/examples/webenginewidgets/simplebrowser/webpage.cpp
index 99849c77d..2e49f651f 100644
--- a/examples/webenginewidgets/simplebrowser/webpage.cpp
+++ b/examples/webenginewidgets/simplebrowser/webpage.cpp
@@ -57,6 +57,7 @@
 #include <QAuthenticator>
 #include <QMessageBox>
 #include <QStyle>
+#include <QTimer>
 #include <QWebEngineCertificateError>
 
 WebPage::WebPage(QWebEngineProfile *profile, QObject *parent)
@@ -74,22 +75,33 @@ WebPage::WebPage(QWebEngineProfile *profile, QObject *parent)
 bool WebPage::certificateError(const QWebEngineCertificateError &error)
 {
     QWidget *mainWindow = view()->window();
-    if (error.isOverridable()) {
-        QDialog dialog(mainWindow);
-        dialog.setModal(true);
-        dialog.setWindowFlags(dialog.windowFlags() & ~Qt::WindowContextHelpButtonHint);
-        Ui::CertificateErrorDialog certificateDialog;
-        certificateDialog.setupUi(&dialog);
-        certificateDialog.m_iconLabel->setText(QString());
-        QIcon icon(mainWindow->style()->standardIcon(QStyle::SP_MessageBoxWarning, 0, mainWindow));
-        certificateDialog.m_iconLabel->setPixmap(icon.pixmap(32, 32));
-        certificateDialog.m_errorLabel->setText(error.errorDescription());
-        dialog.setWindowTitle(tr("Certificate Error"));
-        return dialog.exec() == QDialog::Accepted;
-    }
 
-    QMessageBox::critical(mainWindow, tr("Certificate Error"), error.errorDescription());
-    return false;
+    QWebEngineCertificateError deferredError = error;
+    deferredError.defer();
+
+    QTimer::singleShot(0, mainWindow, [mainWindow, error = std::move(deferredError)] () mutable {
+        if (!error.deferred()) {
+            QMessageBox::critical(mainWindow, tr("Certificate Error"), error.errorDescription());
+        } else {
+            QDialog dialog(mainWindow);
+            dialog.setModal(true);
+            dialog.setWindowFlags(dialog.windowFlags() & ~Qt::WindowContextHelpButtonHint);
+
+            Ui::CertificateErrorDialog certificateDialog;
+            certificateDialog.setupUi(&dialog);
+            certificateDialog.m_iconLabel->setText(QString());
+            QIcon icon(mainWindow->style()->standardIcon(QStyle::SP_MessageBoxWarning, 0, mainWindow));
+            certificateDialog.m_iconLabel->setPixmap(icon.pixmap(32, 32));
+            certificateDialog.m_errorLabel->setText(error.errorDescription());
+            dialog.setWindowTitle(tr("Certificate Error"));
+
+            if (dialog.exec() == QDialog::Accepted)
+                error.ignoreCertificateError();
+            else
+                error.rejectCertificate();
+        }
+    });
+    return true;
 }
 
 void WebPage::handleAuthenticationRequired(const QUrl &requestUrl, QAuthenticator *auth)