QNetworkAccessManager: Support HTTP redirection

This commit adds support for following HTTP redirect responses on a per
request basis.

This behavior is disabled by default. It can be switched on by
setting the QNetworkRequest::FollowRedirectAttribute to true.

2 new error codes have been added to QNetworkReply:

* TooManyRedirectsError: Set when the number of redirects exceed a
given value set by the user (defaults to 50 if not set)

* UnsecureRedirectError: Set when we are redirecting from a 'https'
to 'http' protocol.

Test cases for the following scenarios:
* Single HTTP redirect using local test server
* Changing max-redirects
* Testing all redirect related error scenarios

The next commit will extend this feature at a QNAM level.

Task-number: QTBUG-8232
Change-Id: If9e28ad12bad08bcdc5bc511b1cd59dc9d8150f0
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@theqtcompany.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/src/network/access/qhttpnetworkreply.cpp b/src/network/access/qhttpnetworkreply.cpp
index 2063ca6bd0..172d4dab5b 100644
--- a/src/network/access/qhttpnetworkreply.cpp
+++ b/src/network/access/qhttpnetworkreply.cpp
@@ -78,6 +78,23 @@ void QHttpNetworkReply::setUrl(const QUrl &url)
     d->url = url;
 }
 
+QUrl QHttpNetworkReply::redirectUrl() const
+{
+    return d_func()->redirectUrl;
+}
+
+void QHttpNetworkReply::setRedirectUrl(const QUrl &url)
+{
+    Q_D(QHttpNetworkReply);
+    d->redirectUrl = url;
+}
+
+bool QHttpNetworkReply::isHttpRedirect(int statusCode)
+{
+    return (statusCode == 301 || statusCode == 302 || statusCode == 303
+            || statusCode == 305 || statusCode == 307);
+}
+
 qint64 QHttpNetworkReply::contentLength() const
 {
     return d_func()->contentLength();
@@ -267,6 +284,11 @@ void QHttpNetworkReply::setSpdyWasUsed(bool spdy)
     d_func()->spdyUsed = spdy;
 }
 
+bool QHttpNetworkReply::isRedirecting() const
+{
+    return d_func()->isRedirecting();
+}
+
 QHttpNetworkConnection* QHttpNetworkReply::connection()
 {
     return d_func()->connection;
@@ -910,6 +932,14 @@ qint64 QHttpNetworkReplyPrivate::getChunkSize(QAbstractSocket *socket, qint64 *c
     return bytes;
 }
 
+bool QHttpNetworkReplyPrivate::isRedirecting() const
+{
+    // We're in the process of redirecting - if the HTTP status code says so and
+    // followRedirect is switched on
+    return (QHttpNetworkReply::isHttpRedirect(statusCode)
+            && request.isFollowRedirects());
+}
+
 bool QHttpNetworkReplyPrivate::shouldEmitSignals()
 {
     // for 401 & 407 don't emit the data signals. Content along with these