DataReductionProxyNavigationThrottle

chrome/browser/renderer_host/data_reduction_proxy_navigation_throttle_android.h

Index: chrome/browser/renderer_host/data_reduction_proxy_navigation_throttle_android.h
diff --git a/chrome/browser/renderer_host/data_reduction_proxy_navigation_throttle_android.h b/chrome/browser/renderer_host/data_reduction_proxy_navigation_throttle_android.h
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+// Copyright 2015 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 CHROME_BROWSER_RENDERER_HOST_DATA_REDUCTION_PROXY_NAVIGATION_THROTTLE_ANDROID_H_
+#define CHROME_BROWSER_RENDERER_HOST_DATA_REDUCTION_PROXY_NAVIGATION_THROTTLE_ANDROID_H_
+
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/safe_browsing/safe_browsing_service.h"
+#include "content/public/browser/navigation_throttle.h"
+
+// DataReductionProxyNavigationThrottle checks that URLs are "safe" before
+// navigating to them. To be considered "safe", a URL must not be tagged as a
+// phishing or malware URL by the SPDY proxy.
+//
+// If the URL is tagged as unsafe, a warning page is shown and the request
+// remains suspended. If the user decides to cancel, the request is cancelled.
+// If on the other hand the user decides the URL is safe, the request is
+// resumed.
+//
+// The SPDY proxy and the browser make use of extra headers to communicate.
+// When a proxy detects a malware or a phishing page, it injects a special
+// header and returns a 307 redirect to the same location. If the user decides
+// to proceed, the client injects a special header.
+//
+// Header              Sent From     Description
+// X-Phishing-Url        Proxy      Identified as phishing url.
+// X-Malware-Url         Proxy      Identified as malware url
+// X-Unsafe-Url-Proceed  Browser    User requests proceed.
+//
+// This class lives entirely on the UI thread.
+class DataReductionProxyNavigationThrottle
+    : public content::NavigationThrottle,
+      public base::SupportsWeakPtr<DataReductionProxyNavigationThrottle> {
+ public:
+  // Create a DataReductionProxyNavigationThrottle.  If it's not enabled
+  // or we can't process this navigation, will return NULL.
+  static scoped_ptr<content::NavigationThrottle> MaybeCreate(
+      content::NavigationHandle* navigation_handle,
+      safe_browsing::SafeBrowsingService* sb_service);
+  ~DataReductionProxyNavigationThrottle() override;
+
+  // content::NavigationThrottle implementation.
+  NavigationThrottle::ThrottleCheckResult WillRedirectRequest() override;
+
+ private:
+  // Describes what phase of the check a throttle is in.
+  enum State {
+    STATE_NONE,
+    STATE_DISPLAYING_BLOCKING_PAGE,
+  };
+
+  DataReductionProxyNavigationThrottle(
+      content::NavigationHandle* navigation_handle,
+      safe_browsing::SafeBrowsingService* safe_browsing);
+
+  // SafeBrowsingService::UrlCheckCallback implementation.
+  void OnBlockingPageComplete(bool proceed);
+
+  // Returns the threat type.
+  safe_browsing::SBThreatType CheckUrl();
+
+  State state_;
+
+  // The redirect chain for this resource.
+  std::vector<GURL> redirect_urls_;
+
+  scoped_refptr<safe_browsing::SafeBrowsingService> safe_browsing_;
+
+  DISALLOW_COPY_AND_ASSIGN(DataReductionProxyNavigationThrottle);
+};
+
+#endif  // CHROME_BROWSER_RENDERER_HOST_DATA_REDUCTION_PROXY_NAVIGATION_THROTTLE_ANDROID_H_