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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "chrome/browser/page_load_metrics/ads_detection.h" |
| 6 |
| 7 #include <memory> |
| 8 #include <string> |
| 9 #include <utility> |
| 10 |
| 11 #include "base/logging.h" |
| 12 #include "base/macros.h" |
| 13 #include "base/memory/ptr_util.h" |
| 14 #include "base/strings/string_util.h" |
| 15 #include "base/supports_user_data.h" |
| 16 #include "content/public/browser/navigation_handle.h" |
| 17 #include "content/public/browser/render_frame_host.h" |
| 18 #include "content/public/browser/web_contents.h" |
| 19 #include "url/gurl.h" |
| 20 |
| 21 namespace page_load_metrics { |
| 22 |
| 23 namespace { |
| 24 |
| 25 bool IsGoogleAd(content::NavigationHandle* navigation_handle) { |
| 26 // Because sub-resource filtering isn't always enabled, and doesn't work |
| 27 // well in monitoring mode (no CSS enforcement), it's difficult to identify |
| 28 // ads. Google ads are prevalent and easy to track, so we'll start by |
| 29 // tracking those. Note that the frame name can be very large, so be careful |
| 30 // to avoid full string searches if possible. |
| 31 // TODO(jkarlin): Track other ad networks that are easy to identify. |
| 32 |
| 33 // In case the navigation aborted, look up the RFH by the Frame Tree Node |
| 34 // ID. It returns the committed frame host or the initial frame host for the |
| 35 // frame if no committed host exists. Using a previous host is fine because |
| 36 // once a frame has an ad we always consider it to have an ad. |
| 37 // We use the unsafe method of FindFrameByFrameTreeNodeId because we're not |
| 38 // concerned with which process the frame lives on (we're just measuring |
| 39 // bytes and not granting security privileges). |
| 40 content::RenderFrameHost* current_frame_host = |
| 41 navigation_handle->GetWebContents()->UnsafeFindFrameByFrameTreeNodeId( |
| 42 navigation_handle->GetFrameTreeNodeId()); |
| 43 if (current_frame_host) { |
| 44 const std::string& frame_name = current_frame_host->GetFrameName(); |
| 45 if (base::StartsWith(frame_name, "google_ads_iframe", |
| 46 base::CompareCase::SENSITIVE) || |
| 47 base::StartsWith(frame_name, "google_ads_frame", |
| 48 base::CompareCase::SENSITIVE)) { |
| 49 return true; |
| 50 } |
| 51 } |
| 52 |
| 53 const GURL& frame_url = navigation_handle->GetURL(); |
| 54 if (frame_url.host_piece() == "tpc.googlesyndication.com" && |
| 55 base::StartsWith(frame_url.path_piece(), "/safeframe", |
| 56 base::CompareCase::SENSITIVE)) { |
| 57 return true; |
| 58 } |
| 59 |
| 60 return false; |
| 61 } |
| 62 |
| 63 // Associates the detected AdTypes for a navigation with its NavigationHandle. |
| 64 class NavigationHandleAdsData : public base::SupportsUserData::Data { |
| 65 public: |
| 66 static NavigationHandleAdsData* GetOrCreate( |
| 67 content::NavigationHandle* navigation_handle) { |
| 68 DCHECK(navigation_handle); |
| 69 NavigationHandleAdsData* ads_data = static_cast<NavigationHandleAdsData*>( |
| 70 navigation_handle->GetUserData(kUserDataKey)); |
| 71 if (!ads_data) { |
| 72 std::unique_ptr<NavigationHandleAdsData> new_ads_data = |
| 73 base::MakeUnique<NavigationHandleAdsData>(); |
| 74 |
| 75 // It is safe to retain |ads_data| raw pointer, despite passing an |
| 76 // ownership of |new_ads_data| to SetUserData, because |navigation_handle| |
| 77 // will keep the NavigationHandleAdsData instance alive until the |
| 78 // |navigation_handle| is destroyed. |
| 79 ads_data = new_ads_data.get(); |
| 80 |
| 81 navigation_handle->SetUserData(kUserDataKey, std::move(new_ads_data)); |
| 82 } |
| 83 |
| 84 return ads_data; |
| 85 } |
| 86 |
| 87 NavigationHandleAdsData() = default; |
| 88 ~NavigationHandleAdsData() override {} |
| 89 |
| 90 AdTypes& ad_types() { return ad_types_; } |
| 91 const AdTypes& ad_types() const { return ad_types_; } |
| 92 |
| 93 void CalculateGoogleAdsIfNecessary( |
| 94 content::NavigationHandle* navigation_handle) { |
| 95 if (has_calculated_google_ads_) |
| 96 return; |
| 97 has_calculated_google_ads_ = true; |
| 98 |
| 99 if (IsGoogleAd(navigation_handle)) |
| 100 ad_types_.set(AD_TYPE_GOOGLE); |
| 101 } |
| 102 |
| 103 private: |
| 104 AdTypes ad_types_; |
| 105 bool has_calculated_google_ads_ = false; |
| 106 |
| 107 static const char kUserDataKey[]; |
| 108 |
| 109 DISALLOW_COPY_AND_ASSIGN(NavigationHandleAdsData); |
| 110 }; |
| 111 |
| 112 const char NavigationHandleAdsData::kUserDataKey[] = "AdsData"; |
| 113 |
| 114 } // namespace |
| 115 |
| 116 const AdTypes& GetDetectedAdTypes( |
| 117 content::NavigationHandle* navigation_handle) { |
| 118 DCHECK(navigation_handle); |
| 119 |
| 120 // TODO(lukasza): https://crbug.com/746638: Add a DCHECK that verifies that |
| 121 // GetDetectedAdTypes is called not earlier than when the |navigation_handle| |
| 122 // is ready to commit. |
| 123 |
| 124 NavigationHandleAdsData* ads_data = |
| 125 NavigationHandleAdsData::GetOrCreate(navigation_handle); |
| 126 ads_data->CalculateGoogleAdsIfNecessary(navigation_handle); |
| 127 return ads_data->ad_types(); |
| 128 } |
| 129 |
| 130 void SetDetectedAdType(content::NavigationHandle* navigation_handle, |
| 131 AdType type) { |
| 132 DCHECK(navigation_handle); |
| 133 NavigationHandleAdsData::GetOrCreate(navigation_handle)->ad_types().set(type); |
| 134 } |
| 135 |
| 136 } // namespace page_load_metrics |
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