chrome/browser/banners/app_banner_settings_helper.h

   1 // Copyright 2014 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 #ifndef CHROME_BROWSER_BANNERS_APP_BANNER_SETTINGS_HELPER_H_
   6 #define CHROME_BROWSER_BANNERS_APP_BANNER_SETTINGS_HELPER_H_
   7
   8 #include <set>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "base/macros.h"
  13 #include "base/time/time.h"
  14 #include "ui/base/page_transition_types.h"
  15
  16 namespace content {
  17 class WebContents;
  18 }  // namespace content
  19
  20 class GURL;
  21 class Profile;
  22
  23 // Utility class to record banner events for the given package or start url.
  24 //
  25 // These events are used to decide when banners should be shown, using a
  26 // heuristic based on how many different days in a recent period of time (for
  27 // example the past two weeks) the banner could have been shown, when it was
  28 // last shown, when it was last blocked, and when it was last installed (for
  29 // ServiceWorker style apps - native apps can query whether the app was
  30 // installed directly).
  31 //
  32 // The desired effect is to have banners appear once a user has demonstrated
  33 // an ongoing relationship with the app, and not to pester the user too much.
  34 //
  35 // For most events only the last event is recorded. The exception are the
  36 // could show events. For these a list of the events is maintained. At most
  37 // one event is stored per day, and events outside the window the heuristic
  38 // uses are discarded. Local times are used to enforce these rules, to ensure
  39 // what we count as a day matches what the user perceives to be days.
  40 class AppBannerSettingsHelper {
  41  public:
  42   enum AppBannerEvent {
  43     APP_BANNER_EVENT_COULD_SHOW,
  44     APP_BANNER_EVENT_DID_SHOW,
  45     APP_BANNER_EVENT_DID_BLOCK,
  46     APP_BANNER_EVENT_DID_ADD_TO_HOMESCREEN,
  47     APP_BANNER_EVENT_NUM_EVENTS,
  48   };
  49
  50   enum AppBannerRapporMetric {
  51     WEB,
  52     NATIVE,
  53   };
  54
  55   // BannerEvents record the time that a site was accessed, along with an
  56   // engagement weight representing the importance of the access.
  57   struct BannerEvent {
  58    base::Time time;
  59    double engagement;
  60   };
  61
  62   // The content setting basically records a simplified subset of history.
  63   // For privacy reasons this needs to be cleared. The ClearHistoryForURLs
  64   // function removes any information from the banner content settings for the
  65   // given URls.
  66   static void ClearHistoryForURLs(Profile* profile,
  67                                   const std::set<GURL>& origin_urls);
  68
  69   // Record a banner installation event, for either a WEB or NATIVE app.
  70   static void RecordBannerInstallEvent(
  71       content::WebContents* web_contents,
  72       const std::string& package_name_or_start_url,
  73       AppBannerRapporMetric rappor_metric);
  74
  75   // Record a banner dismissal event, for either a WEB or NATIVE app.
  76   static void RecordBannerDismissEvent(
  77       content::WebContents* web_contents,
  78       const std::string& package_name_or_start_url,
  79       AppBannerRapporMetric rappor_metric);
  80
  81   // Record a banner event. Should not be used for could show events, as they
  82   // require a transition type.
  83   static void RecordBannerEvent(content::WebContents* web_contents,
  84                                 const GURL& origin_url,
  85                                 const std::string& package_name_or_start_url,
  86                                 AppBannerEvent event,
  87                                 base::Time time);
  88
  89   // Record a banner could show event, with a specified transition type.
  90   static void RecordBannerCouldShowEvent(
  91       content::WebContents* web_contents,
  92       const GURL& origin_url,
  93       const std::string& package_name_or_start_url,
  94       base::Time time,
  95       ui::PageTransition transition_type);
  96
  97   // Determine if the banner should be shown, given the recorded events for the
  98   // supplied app.
  99   static bool ShouldShowBanner(content::WebContents* web_contents,
 100                                const GURL& origin_url,
 101                                const std::string& package_name_or_start_url,
 102                                base::Time time);
 103
 104   // Gets the could have been shown events that are stored for the given package
 105   // or start url. This is only exposed for testing.
 106   static std::vector<BannerEvent> GetCouldShowBannerEvents(
 107       content::WebContents* web_contents,
 108       const GURL& origin_url,
 109       const std::string& package_name_or_start_url);
 110
 111   // Get the recorded event for an event type that only records the last event.
 112   // Should not be used with APP_BANNER_EVENT_COULD_SHOW. This is only exposed
 113   // for testing.
 114   static base::Time GetSingleBannerEvent(
 115       content::WebContents* web_contents,
 116       const GURL& origin_url,
 117       const std::string& package_name_or_start_url,
 118       AppBannerEvent event);
 119
 120   // Set the engagement weights assigned to direct and indirect navigations.
 121   // This is only exposed for testing.
 122   static void SetEngagementWeights(double direct_engagement,
 123                                    double indirect_engagement);
 124
 125   // Set the minimum number of minutes between banner visits that will
 126   // trigger a could show banner event. This must be less than the
 127   // number of minutes in a day, and evenly divide the number of minutes
 128   // in a day.
 129   static void SetMinimumMinutesBetweenVisits(unsigned int minutes);
 130
 131   // Bucket a given time to the given resolution in local time.
 132   static base::Time BucketTimeToResolution(base::Time time,
 133                                            unsigned int minutes);
 134
 135   // Updates all values from field trial.
 136   static void UpdateFromFieldTrial();
 137
 138  private:
 139   DISALLOW_IMPLICIT_CONSTRUCTORS(AppBannerSettingsHelper);
 140 };
 141
 142 #endif  // CHROME_BROWSER_BANNERS_APP_BANNER_SETTINGS_HELPER_H_