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| 1 // Copyright 2016 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 COMPONENTS_PREVIEWS_PREVIEWS_BLACK_LIST_ITEM_H_ |
| 6 #define COMPONENTS_PREVIEWS_PREVIEWS_BLACK_LIST_ITEM_H_ |
| 7 |
| 8 #include <stdint.h> |
| 9 |
| 10 #include <list> |
| 11 #include <map> |
| 12 #include <memory> |
| 13 #include <string> |
| 14 |
| 15 #include "base/callback.h" |
| 16 #include "base/macros.h" |
| 17 #include "base/optional.h" |
| 18 #include "base/time/time.h" |
| 19 |
| 20 namespace previews { |
| 21 enum class PreviewsType; |
| 22 |
| 23 // Stores the recent black list history for a single host. Stores |
| 24 // |stored_history_length| of the most recent previews navigations. To determine |
| 25 // previews eligiblity fewer than |opt_out_black_list_threshold| out of the past |
| 26 // |stored_history_length| navigations must be opt outs. |black_list_duration| |
| 27 // is the amount of time that elapses until the host is no longer on the black |
| 28 // list. |
| 29 class PreviewsBlackListItem { |
| 30 public: |
| 31 PreviewsBlackListItem(size_t stored_history_length, |
| 32 int opt_out_black_list_threshold, |
| 33 base::TimeDelta black_list_duration); |
| 34 |
| 35 ~PreviewsBlackListItem(); |
| 36 |
| 37 // Adds a new navigation and returns the base::Time that the event was |
| 38 // recorded. |
| 39 void AddPreviewNavigation(bool opt_out, base::Time entry_time); |
| 40 |
| 41 // Whether the host name corresponding to |this| should be disallowed from |
| 42 // showing previews. |
| 43 bool IsBlackListed(base::Time now) const; |
| 44 |
| 45 private: |
| 46 // A previews navigation to this host can be represented by time and whether |
| 47 // the navigation was an opt out. |
| 48 struct TimeOptOut { |
| 49 base::Time entry_time; // The time that the opt out state was determined. |
| 50 bool opt_out; // Whether the user opt out of the preview. |
| 51 }; |
| 52 |
| 53 // The amount of entries to store to determine preview eligibility. |
| 54 const size_t stored_history_length_; |
| 55 // The number opt outs in recent history that will trigger blacklisting. |
| 56 const int opt_out_black_list_threshold_; |
| 57 // The amount of time to black list a domain after the most recent opt out. |
| 58 const base::TimeDelta black_list_duration_; |
| 59 |
| 60 // The |stored_history_length_| most recent previews navigation. Is maintained |
| 61 // as a list sorted by entry_time (earliest to latest). |
| 62 std::list<TimeOptOut> opt_out_history_; |
| 63 |
| 64 // Time of the most recent opt out. |
| 65 base::Optional<base::Time> most_recent_opt_out_time_; |
| 66 |
| 67 // The total number of opt outs currently in |opt_out_history_|. |
| 68 int total_opt_out_; |
| 69 }; |
| 70 |
| 71 } // namespace previews |
| 72 |
| 73 #endif // COMPONENTS_PREVIEWS_PREVIEWS_BLACK_LIST_ITEM_H_ |
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