Data Reduction Proxy Interstitials

components/data_reduction_proxy/content/browser/data_reduction_proxy_ui_manager.h

+// Copyright 2014 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 COMPONENTS_DATA_REDUCTION_PROXY_CONTENT_BROWSER_DATA_REDUCTION_PROXY_UI_MANAGER_H_
+#define COMPONENTS_DATA_REDUCTION_PROXY_CONTENT_BROWSER_DATA_REDUCTION_PROXY_UI_MANAGER_H_
+
+#include <vector>
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "base/message_loop/message_loop_proxy.h"
+#include "base/time/time.h"
+#include "url/gurl.h"
+
+namespace data_reduction_proxy {
+
+class TestDataReducitonProxyUIManager;
+
+// Construction needs to happen on the main thread.
+class DataReductionProxyUIManager
+    : public base::RefCountedThreadSafe<DataReductionProxyUIManager> {
+ public:
+  // Passed a boolean indicating whether or not it is OK to proceed with
+  // loading an URL.
+  typedef base::Callback<void(bool /*proceed*/)> UrlCheckCallback;
+
+  // Structure used to pass parameters between the IO and UI thread when
+  // interacting with the blocking page.
+  struct BypassResource {
+    BypassResource();
+    ~BypassResource();
+
+    GURL url;
+    bool is_subresource;
+    UrlCheckCallback callback;  // This is called back on the IO thread.
+    int render_process_host_id;
+    int render_view_id;
+  };
+
+  // The DataReductionProxyUIManager handles displaying blocking pages. After
+  // a page is loaded from the blocking page, another blocking page will not be
+  // shown for five minutes.
+  DataReductionProxyUIManager(
+      const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner,
+      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner);
+
+  // Using |resource.render_process_host_id| and |resource.render_view_id|
+  // checks if WebContents exists for the RenderViewHost retreived from these
+  // id's.
+  virtual bool IsTabClosed(const BypassResource& resource) const;
+
+  // Called on the UI thread to display an interstitial page. |url| is the url
+  // of the resource that bypassed. If the request contained a chain of
+  // redirects, |url| is the last url in the chain, and |original_url| is the
+  // first one (the root of the chain). Otherwise, |original_url| = |url|.
+  virtual void DisplayBlockingPage(const BypassResource& resource);
+
+  // The blocking page on the UI thread has completed.
+  void OnBlockingPageDone(const BypassResource& resource, bool proceed);
+
+ private:
+  // Ref counted classes have private destructors to avoid any code deleting the
+  // object accidentally while there are still references to it.
+  friend class base::RefCountedThreadSafe<DataReductionProxyUIManager>;
+  friend class TestDataReductionProxyUIManager;
+
+  virtual ~DataReductionProxyUIManager();
+
+  // Records the last time the blocking page was shown. Once the blocking page

[bengr, 2014/12/31 01:10:21]

"for another five minutes" -> "for a period of time" because this might change
and you already say for how long in the .cc

[megjablon, 2014/12/31 02:12:28]

Done.

+  // is shown, it is not displayed for another five minutes.
+  base::Time blocking_page_last_shown_;
+
+  // A task runner to ensure that calls to DisplayBlockingPage take place on the
+  // UI thread.
+  scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;

[bengr, 2014/12/31 01:10:21]

Add a blank line below.

[megjablon, 2014/12/31 02:12:28]

Done.

+  // A task runner to post OnBlockingPageDone to the IO thread.
+  scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(DataReductionProxyUIManager);
+};
+
+}  // namespace data_reduction_proxy
+
+#endif  // COMPONENTS_DATA_REDUCTION_PROXY_CONTENT_BROWSER_DATA_REDUCTION_PROXY_UI_MANAGER_H_