Componentize SafeBrowsingBlockingPage for WebView use

components/safe_browsing/base_blocking_page.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 "components/safe_browsing/base_blocking_page.h"
+
+#include "base/bind.h"
+#include "base/lazy_instance.h"
+#include "base/memory/ptr_util.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/time/time.h"
+#include "components/safe_browsing_db/safe_browsing_prefs.h"
+#include "components/security_interstitials/content/security_interstitial_controller_client.h"
+#include "components/security_interstitials/core/metrics_helper.h"
+#include "content/public/browser/interstitial_page.h"
+#include "content/public/browser/navigation_entry.h"
+#include "content/public/browser/user_metrics.h"
+#include "content/public/browser/web_contents.h"
+
+using base::UserMetricsAction;
+using content::InterstitialPage;
+using content::WebContents;
+using security_interstitials::SafeBrowsingErrorUI;
+using security_interstitials::SecurityInterstitialControllerClient;
+
+namespace safe_browsing {
+
+namespace {
+
+base::LazyInstance<BaseBlockingPage::UnsafeResourceMap>::Leaky
+    g_unsafe_resource_map = LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+BaseBlockingPage::BaseBlockingPage(
+    BaseUIManager* ui_manager,
+    WebContents* web_contents,
+    const GURL& main_frame_url,
+    const UnsafeResourceList& unsafe_resources,
+    std::unique_ptr<SecurityInterstitialControllerClient> controller_client,
+    const SafeBrowsingErrorUI::SBErrorDisplayOptions& display_options)
+    : SecurityInterstitialPage(web_contents,
+                               unsafe_resources[0].url,
+                               std::move(controller_client)),
+      ui_manager_(ui_manager),
+      main_frame_url_(main_frame_url),
+      navigation_entry_index_to_remove_(
+          IsMainPageLoadBlocked(unsafe_resources) ?
+              -1 :
+              web_contents->GetController().GetLastCommittedEntryIndex()),
+      unsafe_resources_(unsafe_resources),
+      sb_error_ui_(base::MakeUnique<SafeBrowsingErrorUI>(
+                       unsafe_resources_[0].url, main_frame_url_,
+                       GetInterstitialReason(unsafe_resources_),
+                       display_options,
+                       ui_manager->app_locale(),
+                       base::Time::NowFromSystemTime(),
+                       controller())),
+      proceeded_(false) {}
+
+BaseBlockingPage::~BaseBlockingPage() {}
+
+// static
+const SafeBrowsingErrorUI::SBErrorDisplayOptions
+BaseBlockingPage::CreateDefaultDisplayOptions(
+    const UnsafeResourceList& unsafe_resources) {
+  return SafeBrowsingErrorUI::SBErrorDisplayOptions(
+      IsMainPageLoadBlocked(unsafe_resources),
+      true,    // kSafeBrowsingExtendedReportingOptInAllowed
+      false,   // is_off_the_record
+      false,   // is_extended_reporting
+      false,   // is_scout
+      false);  // kSafeBrowsingProceedAnywayDisabled
+}
+
+// static
+void BaseBlockingPage::ShowBlockingPage(
+    BaseUIManager* ui_manager,
+    const UnsafeResource& unsafe_resource) {
+  WebContents* web_contents = unsafe_resource.web_contents_getter.Run();
+
+  if (!InterstitialPage::GetInterstitialPage(web_contents) ||
+      !unsafe_resource.is_subresource) {
+    // There is no interstitial currently showing in that tab, or we are about
+    // to display a new one for the main frame. If there is already an
+    // interstitial, showing the new one will automatically hide the old one.
+    content::NavigationEntry* entry =
+        unsafe_resource.GetNavigationEntryForResource();
+    const UnsafeResourceList resources{unsafe_resource};
+    BaseBlockingPage* blocking_page =
+        new BaseBlockingPage(
+            ui_manager, web_contents,
+            entry ? entry->GetURL() : GURL(),
+            resources,
+            CreateControllerClient(
+                web_contents, resources,
+                ui_manager->history_service(web_contents),
+                ui_manager->app_locale(),
+                ui_manager->default_safe_page()),
+                CreateDefaultDisplayOptions(resources));
+    blocking_page->Show();
+    return;
+  }
+
+  // This is an interstitial for a page's resource, let's queue it.
+  UnsafeResourceMap* unsafe_resource_map = GetUnsafeResourcesMap();
+  (*unsafe_resource_map)[web_contents].push_back(unsafe_resource);
+}
+
+// static
+bool BaseBlockingPage::IsMainPageLoadBlocked(
+    const UnsafeResourceList& unsafe_resources) {
+  // If there is more than one unsafe resource, the main page load must not be
+  // blocked. Otherwise, check if the one resource is.
+  return unsafe_resources.size() == 1 &&
+         unsafe_resources[0].IsMainPageLoadBlocked();
+}
+
+void BaseBlockingPage::OnProceed() {
+  proceeded_ = true;
+
+  ui_manager_->OnBlockingPageDone(unsafe_resources_, true /* proceed */,
+                                  web_contents(), main_frame_url_);
+}
+
+void BaseBlockingPage::OnDontProceed() {
+  // We could have already called Proceed(), in which case we must not notify
+  // the SafeBrowsingUIManager again, as the client has been deleted.
+  if (proceeded_)
+    return;
+
+  if (!sb_error_ui_->is_proceed_anyway_disabled()) {
+    controller()->metrics_helper()->RecordUserDecision(
+        security_interstitials::MetricsHelper::DONT_PROCEED);
+  }
+
+  // Send the malware details, if we opted to.
+  FinishThreatDetails(base::TimeDelta(), false /* did_proceed */,
+                      controller()->metrics_helper()->NumVisits());  // No delay
+
+  ui_manager_->OnBlockingPageDone(unsafe_resources_, false /* proceed */,
+                                  web_contents(), main_frame_url_);
+
+  // The user does not want to proceed, clear the queued unsafe resources
+  // notifications we received while the interstitial was showing.
+  UnsafeResourceMap* unsafe_resource_map = GetUnsafeResourcesMap();
+  UnsafeResourceMap::iterator iter = unsafe_resource_map->find(web_contents());
+  if (iter != unsafe_resource_map->end() && !iter->second.empty()) {
+    ui_manager_->OnBlockingPageDone(iter->second, false, web_contents(),
+                                    main_frame_url_);
+    unsafe_resource_map->erase(iter);
+  }
+
+  // We don't remove the navigation entry if the tab is being destroyed as this
+  // would trigger a navigation that would cause trouble as the render view host
+  // for the tab has by then already been destroyed.  We also don't delete the
+  // current entry if it has been committed again, which is possible on a page
+  // that had a subresource warning.
+  const int last_committed_index =
+      web_contents()->GetController().GetLastCommittedEntryIndex();
+  if (navigation_entry_index_to_remove_ != -1 &&
+      navigation_entry_index_to_remove_ != last_committed_index &&
+      !web_contents()->IsBeingDestroyed()) {
+    CHECK(web_contents()->GetController().RemoveEntryAtIndex(
+        navigation_entry_index_to_remove_));
+  }
+}
+
+void BaseBlockingPage::CommandReceived(
+    const std::string& page_cmd) {
+  if (page_cmd == "\"pageLoadComplete\"") {
+    // content::WaitForRenderFrameReady sends this message when the page
+    // load completes. Ignore it.
+    return;
+  }
+
+  int command = 0;
+  bool retval = base::StringToInt(page_cmd, &command);
+  DCHECK(retval) << page_cmd;
+
+  sb_error_ui_->HandleCommand(
+      static_cast<security_interstitials::SecurityInterstitialCommands>(
+          command));
+}
+
+bool BaseBlockingPage::ShouldCreateNewNavigation() const {
+  return sb_error_ui_->is_main_frame_load_blocked();
+}
+
+void BaseBlockingPage::PopulateInterstitialStrings(
+    base::DictionaryValue* load_time_data) {
+  sb_error_ui_->PopulateStringsForHTML(load_time_data);
+}
+
+void BaseBlockingPage::FinishThreatDetails(const base::TimeDelta& delay,
+                                           bool did_proceed,
+                                           int num_visits) {}
+
+// static
+BaseBlockingPage::UnsafeResourceMap*
+BaseBlockingPage::GetUnsafeResourcesMap() {
+  return g_unsafe_resource_map.Pointer();
+}
+
+// static
+std::string BaseBlockingPage::GetMetricPrefix(
+    const UnsafeResourceList& unsafe_resources,
+    SafeBrowsingErrorUI::SBInterstitialReason interstitial_reason) {
+  bool primary_subresource = unsafe_resources[0].is_subresource;
+  switch (interstitial_reason) {
+    case SafeBrowsingErrorUI::SB_REASON_MALWARE:
+      return primary_subresource ? "malware_subresource" : "malware";
+    case SafeBrowsingErrorUI::SB_REASON_HARMFUL:
+      return primary_subresource ? "harmful_subresource" : "harmful";
+    case SafeBrowsingErrorUI::SB_REASON_PHISHING:
+      ThreatPatternType threat_pattern_type =
+          unsafe_resources[0].threat_metadata.threat_pattern_type;
+      if (threat_pattern_type == ThreatPatternType::PHISHING ||
+          threat_pattern_type == ThreatPatternType::NONE)
+        return primary_subresource ? "phishing_subresource" : "phishing";
+      else if (threat_pattern_type == ThreatPatternType::SOCIAL_ENGINEERING_ADS)
+        return primary_subresource ? "social_engineering_ads_subresource"
+                                   : "social_engineering_ads";
+      else if (threat_pattern_type ==
+               ThreatPatternType::SOCIAL_ENGINEERING_LANDING)
+        return primary_subresource ? "social_engineering_landing_subresource"
+                                   : "social_engineering_landing";
+  }
+  NOTREACHED();
+  return "unkown_metric_prefix";
+}
+
+// We populate a parallel set of metrics to differentiate some threat sources.
+// static
+std::string BaseBlockingPage::GetExtraMetricsSuffix(
+    const UnsafeResourceList& unsafe_resources) {
+  switch (unsafe_resources[0].threat_source) {
+    case safe_browsing::ThreatSource::DATA_SAVER:
+      return "from_data_saver";
+    case safe_browsing::ThreatSource::REMOTE:
+    case safe_browsing::ThreatSource::LOCAL_PVER3:
+      // REMOTE and LOCAL_PVER3 can be distinguished in the logs
+      // by platform type: Remote is mobile, local_pver3 is desktop.
+      return "from_device";
+    case safe_browsing::ThreatSource::LOCAL_PVER4:
+      return "from_device_v4";
+    case safe_browsing::ThreatSource::CLIENT_SIDE_DETECTION:
+      return "from_client_side_detection";
+    case safe_browsing::ThreatSource::UNKNOWN:
+      break;
+  }
+  NOTREACHED();
+  return std::string();
+}
+
+// static
+SafeBrowsingErrorUI::SBInterstitialReason
+BaseBlockingPage::GetInterstitialReason(
+    const UnsafeResourceList& unsafe_resources) {
+  bool harmful = false;
+  for (UnsafeResourceList::const_iterator iter = unsafe_resources.begin();
+       iter != unsafe_resources.end(); ++iter) {
+    const BaseUIManager::UnsafeResource& resource = *iter;
+    safe_browsing::SBThreatType threat_type = resource.threat_type;
+    if (threat_type == SB_THREAT_TYPE_URL_MALWARE ||
+        threat_type == SB_THREAT_TYPE_CLIENT_SIDE_MALWARE_URL) {
+      return SafeBrowsingErrorUI::SB_REASON_MALWARE;
+    } else if (threat_type == SB_THREAT_TYPE_URL_UNWANTED) {
+      harmful = true;
+    } else {
+      DCHECK(threat_type == SB_THREAT_TYPE_URL_PHISHING ||
+             threat_type == SB_THREAT_TYPE_CLIENT_SIDE_PHISHING_URL);
+    }
+  }
+
+  if (harmful)
+    return SafeBrowsingErrorUI::SB_REASON_HARMFUL;
+  return SafeBrowsingErrorUI::SB_REASON_PHISHING;
+}
+
+BaseUIManager* BaseBlockingPage::ui_manager() const {
+  return ui_manager_;
+}
+
+const GURL BaseBlockingPage::main_frame_url() const {
+  return main_frame_url_;
+}
+
+BaseBlockingPage::UnsafeResourceList
+BaseBlockingPage::unsafe_resources() const {
+  return unsafe_resources_;
+}
+
+SafeBrowsingErrorUI* BaseBlockingPage::sb_error_ui() const {
+  return sb_error_ui_.get();
+}
+
+void BaseBlockingPage::set_proceeded(bool proceeded) {
+  proceeded_ = proceeded;
+}
+
+// static
+std::unique_ptr<SecurityInterstitialControllerClient>
+BaseBlockingPage::CreateControllerClient(
+    content::WebContents* web_contents,
+    const UnsafeResourceList& unsafe_resources,
+    history::HistoryService* history_service,
+    const std::string& app_locale,
+    const GURL& default_safe_page) {
+  SafeBrowsingErrorUI::SBInterstitialReason interstitial_reason =
+      GetInterstitialReason(unsafe_resources);
+  security_interstitials::MetricsHelper::ReportDetails reporting_info;
+  reporting_info.metric_prefix =
+      GetMetricPrefix(unsafe_resources, interstitial_reason);
+  reporting_info.extra_suffix = GetExtraMetricsSuffix(unsafe_resources);
+
+  std::unique_ptr<security_interstitials::MetricsHelper> metrics_helper =
+      base::MakeUnique<security_interstitials::MetricsHelper>(
+          unsafe_resources[0].url, reporting_info, history_service);
+
+  return base::MakeUnique<SecurityInterstitialControllerClient>(
+      web_contents, std::move(metrics_helper), nullptr, app_locale,
+      default_safe_page);
+}
+
+}  // namespace safe_browsing