Add redirects policy to QNetworkAccessManager

This patch makes it possible to enable/disable redirects on QNAM
level (before it was per-request only). This policy would be applied
to all subsequent requests* created by QNAM.

The policies we support at the moment:
a. Manual - that's what we always had - it's up to a user to handle
   redirects.
b. NoLessSafeRedirectsPolicy - we allow http->http, http->https and
   https->https redirects, but no protocol 'downgrade' (no
   https->http redirects).
c. SameOriginPolicy - we check that protocol/host/port are
   the same.

Updated tst_qnetworkreply.

*We previously were enabling redirect for each request, by
 setting FollowRedirectsAttribute on QNetworkRequest object.
 For backward compatibility this attribute has a higher priority
 (if set) than QNAM's policy (and it will work as NoLessSafeRedirectsPolicy).

[ChangeLog][QtNetwork] Added redirects policy to QNAM

Task-number: QTPM-239
Task-number: QTPM-237
Change-Id: I493d1728254b71b61b5504937e8e01dca5953527
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

1 files changed, 26 insertions, 0 deletions

diff --git a/src/network/access/qnetworkrequest.cpp b/src/network/access/qnetworkrequest.cpp
index bc2507ca51..abc924d0e2 100644
--- a/src/network/access/qnetworkrequest.cpp
+++ b/src/network/access/qnetworkrequest.cpp
@@ -289,6 +289,12 @@ QT_BEGIN_NAMESPACE
         marked to be decompressed automatically.
         (This value was introduced in 5.9.)
 
+    \value RedirectsPolicyAttribute
+        Requests only, type: QMetaType::Int, should be one of the
+        QNetworkRequest::RedirectsPolicy values (default: ManualRedirectsPolicy).
+        This attribute obsoletes FollowRedirectsAttribute.
+        (This value was introduced in 5.9.)
+
     \value User
         Special type. Additional information can be passed in
         QVariants with types ranging from User to UserMax. The default
@@ -336,6 +342,26 @@ QT_BEGIN_NAMESPACE
     \value Manual               indicates behaviour has been manually overridden.
 */
 
+/*!
+    \enum QNetworkRequest::RedirectsPolicy
+    \since 5.9
+
+    Indicates whether the Network Access API should automatically follow a
+    HTTP redirect response or not.
+
+    \value ManualRedirectsPolicy        Default value: not following any redirects.
+
+    \value NoLessSafeRedirectsPolicy    Only "http"->"http", "http" -> "https"
+                                        or "https" -> "https" redirects are allowed.
+                                        Equivalent to setting the old FollowRedirectsAttribute
+                                        to true
+
+    \value SameOriginRedirectsPolicy    Require the same protocol, host and port.
+                                        Note, http://example.com and http://example.com:80
+                                        will fail with this policy (implicit/explicit ports
+                                        are considered to be a mismatch).
+*/
+
 class QNetworkRequestPrivate: public QSharedData, public QNetworkHeadersPrivate
 {
 public: