Revert of Move remote_db_manager into the safe_browsing_db component.

chrome/browser/safe_browsing/remote_database_manager.cc

Index: chrome/browser/safe_browsing/remote_database_manager.cc
diff --git a/chrome/browser/safe_browsing/remote_database_manager.cc b/chrome/browser/safe_browsing/remote_database_manager.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8a424997617ae90a3348a567de87d0512560a2b4
--- /dev/null
+++ b/chrome/browser/safe_browsing/remote_database_manager.cc
@@ -0,0 +1,285 @@
+// 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.
+
+#include "chrome/browser/safe_browsing/remote_database_manager.h"
+
+#include <vector>
+
+#include "base/metrics/histogram_macros.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_split.h"
+#include "base/timer/elapsed_timer.h"
+#include "chrome/browser/safe_browsing/safe_browsing_api_handler.h"
+#include "components/variations/variations_associated_data.h"
+#include "content/public/browser/browser_thread.h"
+
+using content::BrowserThread;
+
+namespace {
+
+// Android field trial for controlling types_to_check.
+const char kAndroidFieldExperiment[] = "SafeBrowsingAndroid";
+const char kAndroidTypesToCheckParam[] = "types_to_check";
+
+}  // namespace
+
+namespace safe_browsing {
+
+//
+// RemoteSafeBrowsingDatabaseManager::ClientRequest methods
+//
+class RemoteSafeBrowsingDatabaseManager::ClientRequest {
+ public:
+  ClientRequest(Client* client,
+                RemoteSafeBrowsingDatabaseManager* db_manager,
+                const GURL& url);
+
+  static void OnRequestDoneWeak(const base::WeakPtr<ClientRequest>& req,
+                                SBThreatType matched_threat_type,
+                                const std::string& metadata);
+  void OnRequestDone(SBThreatType matched_threat_type,
+                     const std::string& metadata);
+
+  // Accessors
+  Client* client() const { return client_; }
+  const GURL& url() const { return url_; }
+  base::WeakPtr<ClientRequest> GetWeakPtr() {
+    return weak_factory_.GetWeakPtr();
+  }
+
+ private:
+  Client* client_;
+  RemoteSafeBrowsingDatabaseManager* db_manager_;
+  GURL url_;
+  base::ElapsedTimer timer_;
+  base::WeakPtrFactory<ClientRequest> weak_factory_;
+};
+
+RemoteSafeBrowsingDatabaseManager::ClientRequest::ClientRequest(
+    Client* client,
+    RemoteSafeBrowsingDatabaseManager* db_manager,
+    const GURL& url)
+    : client_(client), db_manager_(db_manager), url_(url), weak_factory_(this) {
+}
+
+// Static
+void RemoteSafeBrowsingDatabaseManager::ClientRequest::OnRequestDoneWeak(
+    const base::WeakPtr<ClientRequest>& req,
+    SBThreatType matched_threat_type,
+    const std::string& metadata) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  if (!req)
+    return;  // Previously canceled
+  req->OnRequestDone(matched_threat_type, metadata);
+}
+
+void RemoteSafeBrowsingDatabaseManager::ClientRequest::OnRequestDone(
+    SBThreatType matched_threat_type,
+    const std::string& metadata) {
+  DVLOG(1) << "OnRequestDone took " << timer_.Elapsed().InMilliseconds()
+           << " ms for client " << client_ << " and URL " << url_;
+  client_->OnCheckBrowseUrlResult(url_, matched_threat_type, metadata);
+  UMA_HISTOGRAM_TIMES("SB2.RemoteCall.Elapsed", timer_.Elapsed());
+  // CancelCheck() will delete *this.
+  db_manager_->CancelCheck(client_);
+}
+
+//
+// RemoteSafeBrowsingDatabaseManager methods
+//
+
+// TODO(nparker): Add more tests for this class
+RemoteSafeBrowsingDatabaseManager::RemoteSafeBrowsingDatabaseManager()
+    : enabled_(false) {
+  // Decide which resource types to check. These two are the minimum.
+  resource_types_to_check_.insert(content::RESOURCE_TYPE_MAIN_FRAME);
+  resource_types_to_check_.insert(content::RESOURCE_TYPE_SUB_FRAME);
+
+  // The param is expected to be a comma-separated list of ints
+  // corresponding to the enum types.  We're keeping this finch
+  // control around so we can add back types if they later become dangerous.
+  const std::string ints_str = variations::GetVariationParamValue(
+      kAndroidFieldExperiment, kAndroidTypesToCheckParam);
+  if (ints_str.empty()) {
+    // By default, we check all types except a few.
+    static_assert(content::RESOURCE_TYPE_LAST_TYPE ==
+                      content::RESOURCE_TYPE_PLUGIN_RESOURCE + 1,
+                  "Decide if new resource type should be skipped on mobile.");
+    for (int t_int = 0; t_int < content::RESOURCE_TYPE_LAST_TYPE; t_int++) {
+      content::ResourceType t = static_cast<content::ResourceType>(t_int);
+      switch (t) {
+        case content::RESOURCE_TYPE_STYLESHEET:
+        case content::RESOURCE_TYPE_IMAGE:
+        case content::RESOURCE_TYPE_FONT_RESOURCE:
+        case content::RESOURCE_TYPE_FAVICON:
+          break;
+        default:
+          resource_types_to_check_.insert(t);
+      }
+    }
+  } else {
+    // Use the finch param.
+    for (const std::string& val_str : base::SplitString(
+             ints_str, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
+      int i;
+      if (base::StringToInt(val_str, &i) && i >= 0 &&
+          i < content::RESOURCE_TYPE_LAST_TYPE) {
+        resource_types_to_check_.insert(static_cast<content::ResourceType>(i));
+      }
+    }
+  }
+}
+
+RemoteSafeBrowsingDatabaseManager::~RemoteSafeBrowsingDatabaseManager() {
+  DCHECK(!enabled_);
+}
+
+bool RemoteSafeBrowsingDatabaseManager::IsSupported() const {
+  return SafeBrowsingApiHandler::GetInstance() != nullptr;
+}
+
+safe_browsing::ThreatSource RemoteSafeBrowsingDatabaseManager::GetThreatSource()
+    const {
+  return safe_browsing::ThreatSource::REMOTE;
+}
+
+bool RemoteSafeBrowsingDatabaseManager::ChecksAreAlwaysAsync() const {
+  return true;
+}
+
+bool RemoteSafeBrowsingDatabaseManager::CanCheckResourceType(
+    content::ResourceType resource_type) const {
+  return resource_types_to_check_.count(resource_type) > 0;
+}
+
+bool RemoteSafeBrowsingDatabaseManager::CanCheckUrl(const GURL& url) const {
+  return url.SchemeIs(url::kHttpsScheme) || url.SchemeIs(url::kHttpScheme) ||
+         url.SchemeIs(url::kFtpScheme);
+}
+
+bool RemoteSafeBrowsingDatabaseManager::download_protection_enabled()
+    const {
+  return false;
+}
+
+bool RemoteSafeBrowsingDatabaseManager::CheckDownloadUrl(
+    const std::vector<GURL>& url_chain,
+    Client* client) {
+  NOTREACHED();
+  return true;
+}
+
+bool RemoteSafeBrowsingDatabaseManager::CheckExtensionIDs(
+    const std::set<std::string>& extension_ids,
+    Client* client) {
+  NOTREACHED();
+  return true;
+}
+
+bool RemoteSafeBrowsingDatabaseManager::MatchMalwareIP(
+    const std::string& ip_address) {
+  NOTREACHED();
+  return false;
+}
+
+bool RemoteSafeBrowsingDatabaseManager::MatchCsdWhitelistUrl(const GURL& url) {
+  NOTREACHED();
+  return true;
+}
+
+bool RemoteSafeBrowsingDatabaseManager::MatchDownloadWhitelistUrl(
+    const GURL& url) {
+  NOTREACHED();
+  return true;
+}
+
+bool RemoteSafeBrowsingDatabaseManager::MatchDownloadWhitelistString(
+    const std::string& str) {
+  NOTREACHED();
+  return true;
+}
+
+bool RemoteSafeBrowsingDatabaseManager::MatchInclusionWhitelistUrl(
+    const GURL& url) {
+  NOTREACHED();
+  return true;
+}
+
+bool RemoteSafeBrowsingDatabaseManager::IsMalwareKillSwitchOn() {
+  NOTREACHED();
+  return true;
+}
+
+bool RemoteSafeBrowsingDatabaseManager::IsCsdWhitelistKillSwitchOn() {
+  NOTREACHED();
+  return true;
+}
+
+bool RemoteSafeBrowsingDatabaseManager::CheckBrowseUrl(const GURL& url,
+                                                       Client* client) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  if (!enabled_)
+    return true;
+
+  bool can_check_url = CanCheckUrl(url);
+  UMA_HISTOGRAM_BOOLEAN("SB2.RemoteCall.CanCheckUrl", can_check_url);
+  if (!can_check_url)
+    return true;  // Safe, continue right away.
+
+  scoped_ptr<ClientRequest> req(new ClientRequest(client, this, url));
+  std::vector<SBThreatType> threat_types;  // Not currently used.
+
+  DVLOG(1) << "Checking for client " << client << " and URL " << url;
+  SafeBrowsingApiHandler* api_handler = SafeBrowsingApiHandler::GetInstance();
+  // This shouldn't happen since SafeBrowsingResourceThrottle checks
+  // IsSupported() ealier.
+  DCHECK(api_handler) << "SafeBrowsingApiHandler was never constructed";
+  api_handler->StartURLCheck(
+      base::Bind(&ClientRequest::OnRequestDoneWeak, req->GetWeakPtr()), url,
+      threat_types);
+
+  UMA_HISTOGRAM_COUNTS_10000("SB2.RemoteCall.ChecksPending",
+                             current_requests_.size());
+  current_requests_.push_back(req.release());
+
+  // Defer the resource load.
+  return false;
+}
+
+void RemoteSafeBrowsingDatabaseManager::CancelCheck(Client* client) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DCHECK(enabled_);
+  for (auto itr = current_requests_.begin(); itr != current_requests_.end();
+       ++itr) {
+    if ((*itr)->client() == client) {
+      DVLOG(2) << "Canceling check for URL " << (*itr)->url();
+      delete *itr;
+      current_requests_.erase(itr);
+      return;
+    }
+  }
+  NOTREACHED();
+}
+
+void RemoteSafeBrowsingDatabaseManager::StartOnIOThread() {
+  VLOG(1) << "RemoteSafeBrowsingDatabaseManager starting";
+  enabled_ = true;
+}
+
+void RemoteSafeBrowsingDatabaseManager::StopOnIOThread(bool shutdown) {
+  // |shutdown| is not used.
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DVLOG(1) << "RemoteSafeBrowsingDatabaseManager stopping";
+
+  // Call back and delete any remaining clients. OnRequestDone() modifies
+  // |current_requests_|, so we make a copy first.
+  std::vector<ClientRequest*> to_callback(current_requests_);
+  for (auto req : to_callback) {
+    DVLOG(1) << "Stopping: Invoking unfinished req for URL " << req->url();
+    req->OnRequestDone(SB_THREAT_TYPE_SAFE, std::string());
+  }
+  enabled_ = false;
+}
+
+}  // namespace safe_browsing