First experimental implementation of the Clear-Site-Data header

content/browser/browsing_data/clear_site_data_header_observer.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_BROWSER_BROWSING_DATA_CLEAR_SITE_DATA_HEADER_OBSERVER_H_
+#define CONTENT_BROWSER_BROWSING_DATA_CLEAR_SITE_DATA_HEADER_OBSERVER_H_
+
+#include <memory>
+#include <vector>
+
+#include "base/gtest_prod_util.h"
+#include "base/macros.h"
+#include "base/values.h"
+#include "content/public/browser/resource_request_info.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/common/console_message_level.h"
+#include "url/gurl.h"
+
+class Profile;

[nasko, 2016/07/28 17:30:30]

This is unused. What is it for?

[msramek, 2016/08/01 16:03:19]

Removed, thanks for catching.

+
+namespace content {
+
+class NavigationHandle;
+
+// This observer asynchronously executes the clearing of browsing data.
+// TODO(msramek): It is currently not clear whether we should defer
+// the navigation until clearing is complete. If we decide that it should,
+// this class should be instead implemented as a NavigationThrottle.
+class CONTENT_EXPORT ClearSiteDataHeaderObserver : public WebContentsObserver {
+ public:
+  struct ConsoleMessage {
+    GURL url;
+    std::string text;
+    ConsoleMessageLevel level;
+  };
+
+  static std::unique_ptr<ClearSiteDataHeaderObserver>
+      CreateFor(NavigationHandle* handle);

[nasko, 2016/07/28 17:30:30]

Can you document what this method does? Since this is WebContentsObserver, it
should only be created and correspond 1:1 with a WebContents object.

[msramek, 2016/08/01 16:03:19]

See the other comment - let's discuss whether this should be a
WebContentsObserver in the first place.

+
+  ~ClearSiteDataHeaderObserver() override;
+
+  // WebContentsObserver implementation:
+  void DidStartNavigation(NavigationHandle* handle) override;
+  void DidRedirectNavigation(NavigationHandle* handle) override;
+  void DidFinishNavigation(NavigationHandle* handle) override;
+
+ private:
+  explicit ClearSiteDataHeaderObserver(WebContents* web_contents);
+
+  // Scans for 'Clear-Site-Data' headers, calls ParseHeader() to parse them,
+  // and requests the actual data clearing. This is the common logic
+  // of WillProcessResponse() and WillRedirectRequest().

[nasko, 2016/07/28 17:30:31]

Those two methods no longer exist here.

[msramek, 2016/08/01 16:03:19]

Renamed to WebContentObserver ~equivalents.

+  void HandleHeader(NavigationHandle* navigation_handle);
+
+  // Parses the value of the 'Clear-Site-Data' header and outputs whether

[nasko, 2016/07/28 17:30:31]

Can you point to the spec for this header? It might be useful to also have it at
the class level comment, as for now this class is used for that functionality
only.

[msramek, 2016/08/01 16:03:19]

Done. (Referenced it in the class comment)

+  // the header requests to |clear_cookies|, |clear_storage|, and |clear_cache|.
+  // The |messages| vector will be filled with messages to be output in the
+  // console. Returns true if parsing was successful.
+  bool ParseHeader(const std::string& header,
+                   bool* clear_cookies, bool* clear_storage, bool* clear_cache,
+                   std::vector<ConsoleMessage>* messages);
+
+  // Cached console messages to be output when the RenderFrameHost is ready.
+  std::vector<ConsoleMessage> messages_;
+  GURL current_url_;
+
+  friend class ClearSiteDataHeaderObserverTest;

[nasko, 2016/07/28 17:30:30]

friend declarations go right after the private: label.

[msramek, 2016/08/01 16:03:19]

Done.

+  FRIEND_TEST_ALL_PREFIXES(ClearSiteDataHeaderObserverTest, ParseHeader);
+  FRIEND_TEST_ALL_PREFIXES(ClearSiteDataHeaderObserverTest, InvalidHeader);
+
+  DISALLOW_COPY_AND_ASSIGN(ClearSiteDataHeaderObserver);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_BROWSING_DATA_CLEAR_SITE_DATA_HEADER_OBSERVER_H_