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

chrome/renderer/safe_browsing/safe_browsing_url_loader_throttle.cc

+// 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.
+
+#include "chrome/renderer/safe_browsing/safe_browsing_url_loader_throttle.h"
+
+#include "base/logging.h"
+#include "net/url_request/redirect_info.h"
+
+namespace safe_browsing {
+
+SafeBrowsingURLLoaderThrottle::SafeBrowsingURLLoaderThrottle(
+    chrome::mojom::SafeBrowsing* safe_browsing)
+    : safe_browsing_(safe_browsing), weak_factory_(this) {}
+
+SafeBrowsingURLLoaderThrottle::~SafeBrowsingURLLoaderThrottle() = default;
+
+void SafeBrowsingURLLoaderThrottle::WillStartRequest(
+    const GURL& url,
+    int load_flags,
+    content::ResourceType resource_type,
+    bool* defer) {
+  DCHECK_EQ(0u, pending_checks_);
+  DCHECK(!blocked_);
+  DCHECK(!url_checker_);
+
+  pending_checks_++;
+  // Use a weak pointer to self because |safe_browsing_| is not owned by this
+  // object.
+  safe_browsing_->CreateCheckerAndCheck(
+      mojo::MakeRequest(&url_checker_), url, load_flags, resource_type,
+      base::Bind(&SafeBrowsingURLLoaderThrottle::OnCheckUrlResult,
+                 weak_factory_.GetWeakPtr()));
+  safe_browsing_ = nullptr;
+
+  url_checker_.set_connection_error_handler(
+      base::Bind(&SafeBrowsingURLLoaderThrottle::OnConnectionError,
+                 base::Unretained(this)));
+}
+
+void SafeBrowsingURLLoaderThrottle::WillRedirectRequest(
+    const net::RedirectInfo& redirect_info,
+    bool* defer) {
+  // If |blocked_| is true, the resource load has been canceled and there
+  // shouldn't be such a notification.
+  DCHECK(!blocked_);
+
+  if (!url_checker_) {
+    DCHECK_EQ(0u, pending_checks_);
+    return;
+  }
+
+  pending_checks_++;
+  url_checker_->CheckUrl(
+      redirect_info.new_url,
+      base::Bind(&SafeBrowsingURLLoaderThrottle::OnCheckUrlResult,
+                 base::Unretained(this)));
+}
+
+void SafeBrowsingURLLoaderThrottle::WillProcessResponse(bool* defer) {
+  // If |blocked_| is true, the resource load has been canceled and there
+  // shouldn't be such a notification.
+  DCHECK(!blocked_);
+
+  if (pending_checks_ > 0)
+    *defer = true;
+}
+
+void SafeBrowsingURLLoaderThrottle::OnCheckUrlResult(bool result) {
+  if (blocked_ || !url_checker_)
+    return;
+
+  DCHECK_LT(0u, pending_checks_);
+  pending_checks_--;
+
+  if (result) {
+    if (pending_checks_ == 0) {
+      // The resource load is not necessarily deferred, in that case Resume() is
+      // a no-op.
+      delegate_->Resume();
+    }
+  } else {
+    url_checker_.reset();
+    blocked_ = true;
+    pending_checks_ = 0;
+    delegate_->CancelWithError(net::ERR_ABORTED);
+  }
+}
+
+void SafeBrowsingURLLoaderThrottle::OnConnectionError() {
+  DCHECK(!blocked_);
+
+  // If a service-side disconnect happens, treate all URLs as if they are safe.
+  url_checker_.reset();
+  pending_checks_ = 0;
+  delegate_->Resume();
+}
+
+}  // namespace safe_browsing