QWebEngineUrlResponseInterceptor: Implement new URL response interceptor

This patch adds the QWebEngineUrlResponseInterceptor abstract class,
which, when implemented, allows a user to intercept response headers and
modify them in any way they like.

A response interceptor can be set via
QWebEngineProfile::setUrlResponseInterceptor(),
QQuickWebEngineProfile::setUrlResponseInterceptor() or
QWebEnginePage::setUrlResponseInterceptor().

Also, the QWebEngineUrlResponseInfo class is implemented, which contains
the request and response data to be used with the response interceptor.

If a response interceptor is set in the profile and page, the one in the
profile takes precedence.

Fixes: QTBUG-61071
Change-Id: I484d14373ff597b1d531541c066f0102bae28c72
Reviewed-by: Michael Brüning <michael.bruning@qt.io>

1 files changed, 21 insertions, 3 deletions

diff --git a/src/core/api/qwebengineprofile.cpp b/src/core/api/qwebengineprofile.cpp
index ab873e345..3a4c899d9 100644
--- a/src/core/api/qwebengineprofile.cpp
+++ b/src/core/api/qwebengineprofile.cpp
@@ -62,9 +62,12 @@ using QtWebEngineCore::ProfileAdapter;
     The default profile can be accessed by defaultProfile(). It is a built-in profile that all
     web pages not specifically created with another profile belong to.
 
-    Implementing the QWebEngineUrlRequestInterceptor interface and registering the interceptor on a
-    profile by setUrlRequestInterceptor() enables intercepting, blocking, and modifying URL
-    requests (QWebEngineUrlRequestInfo) before they reach the networking stack of Chromium.
+    You can implement interceptor interfaces for URL requests and responses and register them
+    on a profile to intercept, block, or modify URL requests before they reach the networking
+    stack of Chromium or response headers right after they come off the networking stack of
+    Chromium. For requests, implement QWebEngineUrlRequestInterceptor and register it via
+    setUrlRequestInterceptor(). For response headers, implement QWebEngineUrlResponseInterceptor
+    and register it via setUrlResponseInterceptor().
 
     A QWebEngineUrlSchemeHandler can be registered for a profile by installUrlSchemeHandler()
     to add support for custom URL schemes. Requests for the scheme are then issued to
@@ -603,6 +606,21 @@ void QWebEngineProfile::setUrlRequestInterceptor(QWebEngineUrlRequestInterceptor
 }
 
 /*!
+    Registers a response interceptor singleton \a interceptor to intercept URL response headers.
+
+    The profile does not take ownership of the pointer.
+
+    \since 6.6
+    \sa QWebEngineUrlResponseInterceptor
+*/
+
+void QWebEngineProfile::setUrlResponseInterceptor(QWebEngineUrlResponseInterceptor *interceptor)
+{
+    Q_D(QWebEngineProfile);
+    d->profileAdapter()->setResponseInterceptor(interceptor);
+}
+
+/*!
     Clears all links from the visited links database.
 
     \sa clearVisitedLinks()