Network service: Safe browsing check for sub-resources from renderer.

chrome/renderer/safe_browsing/safe_browsing_url_loader_throttle.h

+// Copyright 2017 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_RENDERER_SAFE_BROWSING_SAFE_BROWSING_URL_LOADER_THROTTLE_H_
+#define CHROME_RENDERER_SAFE_BROWSING_SAFE_BROWSING_URL_LOADER_THROTTLE_H_
+
+#include "base/memory/weak_ptr.h"
+#include "chrome/common/safe_browsing.mojom.h"
+#include "content/public/child/url_loader_throttle.h"
+
+namespace chrome {
+namespace mojom {
+class SafeBrowsing;
+}
+}
+
+namespace safe_browsing {
+
+// SafeBrowsingURLLoaderThrottle queries safe browsing to determine whether the
+// URL and also redirect URLs are safe to load. It defers response processing
+// until all URL checks are completed; cancels the load if any URLs turn out to
+// be bad.
+class SafeBrowsingURLLoaderThrottle : public content::URLLoaderThrottle {
+ public:
+  // |safe_browsing| must stay alive until WillStartRequest() (if it is called)
+  // or the end of this object.
+  // |render_frame_id| is used for displaying safe browsing UI when necessary.
+  SafeBrowsingURLLoaderThrottle(chrome::mojom::SafeBrowsing* safe_browsing,
+                                int render_frame_id);
+  ~SafeBrowsingURLLoaderThrottle() override;
+
+  // content::URLLoaderThrottle implementation.
+  void WillStartRequest(const GURL& url,
+                        int load_flags,
+                        content::ResourceType resource_type,
+                        bool* defer) override;
+  void WillRedirectRequest(const net::RedirectInfo& redirect_info,
+                           bool* defer) override;
+  void WillProcessResponse(bool* defer) override;
+
+ private:
+  void OnCheckUrlResult(bool safe);
+
+  void OnConnectionError();
+
+  chrome::mojom::SafeBrowsing* safe_browsing_;
+  const int render_frame_id_;
+
+  chrome::mojom::SafeBrowsingUrlCheckerPtr url_checker_;
+
+  size_t pending_checks_ = 0;
+  bool blocked_ = false;
+
+  base::WeakPtrFactory<SafeBrowsingURLLoaderThrottle> weak_factory_;
+};
+
+}  // namespace safe_browsing
+
+#endif  // CHROME_RENDERER_SAFE_BROWSING_SAFE_BROWSING_URL_LOADER_THROTTLE_H_