List the URL schemes supported by QNetworkAccessManager

Introducing a new method which allows us to know before hand if an URL
scheme will be supported by QNetworkAccessManager. It is especially useful in
combination with QFileDialog URL based methods to pass this list as the
allowed schemes the user can select in the dialog.

Change-Id: If625b045e87959bfd78fea2c9213b69caf506886
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/src/network/access/qnetworkaccessmanager.cpp b/src/network/access/qnetworkaccessmanager.cpp
index 8c671a8c99..402bdeba24 100644
--- a/src/network/access/qnetworkaccessmanager.cpp
+++ b/src/network/access/qnetworkaccessmanager.cpp
@@ -1159,6 +1159,57 @@ QNetworkReply *QNetworkAccessManager::createRequest(QNetworkAccessManager::Opera
     return reply;
 }
 
+/*!
+    \since 5.2
+
+    Lists all the URL schemes supported by the access manager.
+
+    \sa supportedSchemesImplementation()
+*/
+QStringList QNetworkAccessManager::supportedSchemes() const
+{
+    QStringList schemes;
+    QNetworkAccessManager *self = const_cast<QNetworkAccessManager *>(this); // We know we call a const slot
+    QMetaObject::invokeMethod(self, "supportedSchemesImplementation", Qt::DirectConnection,
+                              Q_RETURN_ARG(QStringList, schemes));
+    schemes.removeDuplicates();
+    return schemes;
+}
+
+/*!
+    \since 5.2
+
+    Lists all the URL schemes supported by the access manager.
+
+    You should not call this function directly; use
+    QNetworkAccessManager::supportedSchemes() instead.
+
+    Reimplement this slot to provide your own supported schemes
+    in a QNetworkAccessManager subclass. It is for instance necessary
+    when your subclass provides support for new protocols.
+
+    Because of binary compatibility constraints, the supportedSchemes()
+    method (introduced in Qt 5.2) is not virtual. Instead, supportedSchemes()
+    will dynamically detect and call this slot.
+
+    \sa supportedSchemes()
+*/
+QStringList QNetworkAccessManager::supportedSchemesImplementation() const
+{
+    Q_D(const QNetworkAccessManager);
+
+    QStringList schemes = d->backendSupportedSchemes();
+    // Those ones don't exist in backends
+#ifndef QT_NO_HTTP
+    schemes << QStringLiteral("http");
+#ifndef QT_NO_SSL
+    if (QSslSocket::supportsSsl())
+        schemes << QStringLiteral("https");
+#endif
+#endif
+    schemes << QStringLiteral("data");
+    return schemes;
+}
 
 /*!
     \since 5.0