Split content settings pref related logic into a separate class

components/content_settings/core/browser/content_settings_pref.cc

Index: components/content_settings/core/browser/content_settings_pref.cc
diff --git a/components/content_settings/core/browser/content_settings_pref_provider.cc b/components/content_settings/core/browser/content_settings_pref.cc
similarity index 77%
copy from components/content_settings/core/browser/content_settings_pref_provider.cc
copy to components/content_settings/core/browser/content_settings_pref.cc
index c5060511400ba19afa90e83984baf660e7ff136d..a643697cbdee3410ebd42d58d4010f9bda8ecc9f 100644
--- a/components/content_settings/core/browser/content_settings_pref_provider.cc
+++ b/components/content_settings/core/browser/content_settings_pref.cc
@@ -1,40 +1,29 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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 "components/content_settings/core/browser/content_settings_pref_provider.h"
-
-#include <map>
-#include <string>
-#include <utility>
+#include "components/content_settings/core/browser/content_settings_pref.h"
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
-#include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
-#include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/strings/string_split.h"
 #include "base/time/clock.h"
-#include "base/time/default_clock.h"
 #include "components/content_settings/core/browser/content_settings_rule.h"
 #include "components/content_settings/core/browser/content_settings_utils.h"
 #include "components/content_settings/core/browser/host_content_settings_map.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_pattern.h"
 #include "components/content_settings/core/common/pref_names.h"
-#include "components/pref_registry/pref_registry_syncable.h"
 #include "url/gurl.h"
 
 namespace {
 
 typedef std::pair<std::string, std::string> StringPair;
-typedef std::map<std::string, std::string> StringMap;
 
 const char kPerPluginPrefName[] = "per_plugin";
-const char kAudioKey[] = "audio";
-const char kVideoKey[] = "video";
 const char kLastUsed[] = "last_used";
 
 ContentSetting FixObsoleteCookiePromptMode(ContentSettingsType content_type,
@@ -63,66 +52,52 @@ bool GetResourceTypeName(ContentSettingsType content_type,
 
 namespace content_settings {
 
-// ////////////////////////////////////////////////////////////////////////////
-// PrefProvider:
-//
-
-// static
-void PrefProvider::RegisterProfilePrefs(
-    user_prefs::PrefRegistrySyncable* registry) {
-  registry->RegisterIntegerPref(
-      prefs::kContentSettingsVersion,
-      ContentSettingsPattern::kContentSettingsPatternVersion,
-      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
-  registry->RegisterDictionaryPref(
-      prefs::kContentSettingsPatternPairs,
-      user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
-}
-
-PrefProvider::PrefProvider(PrefService* prefs, bool incognito)
+ContentSettingsPref::ContentSettingsPref(
+    PrefService* prefs,
+    PrefChangeRegistrar* registrar,
+    base::Clock* clock,
+    bool incognito,
+    NotifyObserversCallback notify_callback)
     : prefs_(prefs),
-      clock_(new base::DefaultClock()),
+      clock_(clock),
+      registrar_(registrar),
       is_incognito_(incognito),
-      updating_preferences_(false) {
+      updating_preferences_(false),
+      notify_callback_(notify_callback) {
   DCHECK(prefs_);
-  // Verify preferences version.
-  if (!prefs_->HasPrefPath(prefs::kContentSettingsVersion)) {
-    prefs_->SetInteger(prefs::kContentSettingsVersion,
-                      ContentSettingsPattern::kContentSettingsPatternVersion);
-  }
-  if (prefs_->GetInteger(prefs::kContentSettingsVersion) >
-      ContentSettingsPattern::kContentSettingsPatternVersion) {
-    return;
-  }
 
   // Read content settings exceptions.
   ReadContentSettingsFromPref();
 
-  if (!is_incognito_) {
-    UMA_HISTOGRAM_COUNTS("ContentSettings.NumberOfExceptions",
-                         value_map_.size());
-  }
-
-  // Migrate the obsolete media content setting exceptions to the new settings.
-  // This needs to be done after ReadContentSettingsFromPref().
-  if (!is_incognito_)
-    MigrateObsoleteMediaContentSetting();
-
-  pref_change_registrar_.Init(prefs_);
-  pref_change_registrar_.Add(
+  registrar->Add(
       prefs::kContentSettingsPatternPairs,
-      base::Bind(&PrefProvider::OnContentSettingsPatternPairsChanged,
+      base::Bind(&ContentSettingsPref::OnContentSettingsPatternPairsChanged,
                  base::Unretained(this)));
 }
 
-bool PrefProvider::SetWebsiteSetting(
+ContentSettingsPref::~ContentSettingsPref() {
+}
+
+RuleIterator* ContentSettingsPref::GetRuleIterator(
+    ContentSettingsType content_type,
+    const ResourceIdentifier& resource_identifier,
+    bool incognito) const {
+  if (incognito)
+    return incognito_value_map_.GetRuleIterator(content_type,
+                                                resource_identifier,
+                                                &lock_);
+  return value_map_.GetRuleIterator(content_type, resource_identifier, &lock_);
+}
+
+bool ContentSettingsPref::SetWebsiteSetting(
     const ContentSettingsPattern& primary_pattern,
     const ContentSettingsPattern& secondary_pattern,
     ContentSettingsType content_type,
     const ResourceIdentifier& resource_identifier,
     base::Value* in_value) {
-  DCHECK(CalledOnValidThread());
+  DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(prefs_);
+
   // Default settings are set using a wildcard pattern for both
   // |primary_pattern| and |secondary_pattern|. Don't store default settings in
   // the |PrefProvider|. The |PrefProvider| handles settings for specific
@@ -167,15 +142,15 @@ bool PrefProvider::SetWebsiteSetting(
                value.get());
   }
 
-  NotifyObservers(
+  notify_callback_.Run(
       primary_pattern, secondary_pattern, content_type, resource_identifier);
 
   return true;
 }
 
-void PrefProvider::ClearAllContentSettingsRules(
+void ContentSettingsPref::ClearAllContentSettingsRules(
     ContentSettingsType content_type) {
-  DCHECK(CalledOnValidThread());
+  DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(prefs_);
 
   OriginIdentifierValueMap* map_to_modify = &incognito_value_map_;
@@ -202,157 +177,100 @@ void PrefProvider::ClearAllContentSettingsRules(
                std::string(),
                NULL);
   }
-  NotifyObservers(ContentSettingsPattern(),
-                  ContentSettingsPattern(),
-                  content_type,
-                  std::string());
-}
-
-PrefProvider::~PrefProvider() {
-  DCHECK(!prefs_);
-}
-
-RuleIterator* PrefProvider::GetRuleIterator(
-    ContentSettingsType content_type,
-    const ResourceIdentifier& resource_identifier,
-    bool incognito) const {
-  if (incognito)
-    return incognito_value_map_.GetRuleIterator(content_type,
-                                                resource_identifier,
-                                                &lock_);
-  return value_map_.GetRuleIterator(content_type, resource_identifier, &lock_);
+  notify_callback_.Run(ContentSettingsPattern(),
+                       ContentSettingsPattern(),
+                       content_type,
+                       std::string());
 }
 
-// ////////////////////////////////////////////////////////////////////////////
-// Private
-
-void PrefProvider::UpdatePref(
+void ContentSettingsPref::UpdateLastUsage(
     const ContentSettingsPattern& primary_pattern,
     const ContentSettingsPattern& secondary_pattern,
-    ContentSettingsType content_type,
-    const ResourceIdentifier& resource_identifier,
-    const base::Value* value) {
+    ContentSettingsType content_type) {
+  // Don't write if in incognito.
+  if (is_incognito_) {
+    return;
+  }
+
   // Ensure that |lock_| is not held by this thread, since this function will
   // send out notifications (by |~DictionaryPrefUpdate|).
   AssertLockNotHeld();
 
   base::AutoReset<bool> auto_reset(&updating_preferences_, true);
   {
-    DictionaryPrefUpdate update(prefs_,
-                                prefs::kContentSettingsPatternPairs);
+    DictionaryPrefUpdate update(prefs_, prefs::kContentSettingsPatternPairs);
     base::DictionaryValue* pattern_pairs_settings = update.Get();
 
-    // Get settings dictionary for the given patterns.
-    std::string pattern_str(CreatePatternString(primary_pattern,
-                                                secondary_pattern));
+    std::string pattern_str(
+        CreatePatternString(primary_pattern, secondary_pattern));
     base::DictionaryValue* settings_dictionary = NULL;
     bool found = pattern_pairs_settings->GetDictionaryWithoutPathExpansion(
         pattern_str, &settings_dictionary);
 
-    if (!found && value) {
+    if (!found) {
       settings_dictionary = new base::DictionaryValue;
-      pattern_pairs_settings->SetWithoutPathExpansion(
-          pattern_str, settings_dictionary);
+      pattern_pairs_settings->SetWithoutPathExpansion(pattern_str,
+                                                      settings_dictionary);
     }
 
-    if (settings_dictionary) {
-      std::string res_dictionary_path;
-      if (GetResourceTypeName(content_type, &res_dictionary_path) &&
-          !resource_identifier.empty()) {
-        base::DictionaryValue* resource_dictionary = NULL;
-        found = settings_dictionary->GetDictionary(
-            res_dictionary_path, &resource_dictionary);
-        if (!found) {
-          if (value == NULL)
-            return;  // Nothing to remove. Exit early.
-          resource_dictionary = new base::DictionaryValue;
-          settings_dictionary->Set(res_dictionary_path, resource_dictionary);
-        }
-        // Update resource dictionary.
-        if (value == NULL) {
-          resource_dictionary->RemoveWithoutPathExpansion(resource_identifier,
-                                                          NULL);
-          if (resource_dictionary->empty()) {
-            settings_dictionary->RemoveWithoutPathExpansion(
-                res_dictionary_path, NULL);
-          }
-        } else {
-          resource_dictionary->SetWithoutPathExpansion(
-              resource_identifier, value->DeepCopy());
-        }
-      } else {
-        // Update settings dictionary.
-        std::string setting_path = GetTypeName(content_type);
-        if (value == NULL) {
-          settings_dictionary->RemoveWithoutPathExpansion(setting_path,
-                                                          NULL);
-          settings_dictionary->RemoveWithoutPathExpansion(kLastUsed, NULL);
-        } else {
-          settings_dictionary->SetWithoutPathExpansion(
-              setting_path, value->DeepCopy());
-        }
-      }
-      // Remove the settings dictionary if it is empty.
-      if (settings_dictionary->empty()) {
-        pattern_pairs_settings->RemoveWithoutPathExpansion(
-            pattern_str, NULL);
-      }
+    base::DictionaryValue* last_used_dictionary = NULL;
+    found = settings_dictionary->GetDictionaryWithoutPathExpansion(
+        kLastUsed, &last_used_dictionary);
+
+    if (!found) {
+      last_used_dictionary = new base::DictionaryValue;
+      settings_dictionary->SetWithoutPathExpansion(kLastUsed,
+                                                   last_used_dictionary);
     }
+
+    std::string settings_path = GetTypeName(content_type);
+    last_used_dictionary->Set(
+        settings_path, new base::FundamentalValue(clock_->Now().ToDoubleT()));
   }
 }
 
+base::Time ContentSettingsPref::GetLastUsage(
+    const ContentSettingsPattern& primary_pattern,
+    const ContentSettingsPattern& secondary_pattern,
+    ContentSettingsType content_type) {
+  const base::DictionaryValue* pattern_pairs_settings =
+      prefs_->GetDictionary(prefs::kContentSettingsPatternPairs);
+  std::string pattern_str(
+      CreatePatternString(primary_pattern, secondary_pattern));
+
+  const base::DictionaryValue* settings_dictionary = NULL;
+  bool found = pattern_pairs_settings->GetDictionaryWithoutPathExpansion(
+      pattern_str, &settings_dictionary);
 
-void PrefProvider::MigrateObsoleteMediaContentSetting() {
-  std::vector<Rule> rules_to_delete;
-  {
-    scoped_ptr<RuleIterator> rule_iterator(GetRuleIterator(
-        CONTENT_SETTINGS_TYPE_MEDIASTREAM, std::string(), false));
-    while (rule_iterator->HasNext()) {
-      // Skip default setting and rules without a value.
-      const content_settings::Rule& rule = rule_iterator->Next();
-      DCHECK(rule.primary_pattern != ContentSettingsPattern::Wildcard());
-      if (!rule.value.get())
-        continue;
-      rules_to_delete.push_back(rule);
-    }
-  }
+  if (!found)
+    return base::Time();
 
-  for (std::vector<Rule>::const_iterator it = rules_to_delete.begin();
-       it != rules_to_delete.end(); ++it) {
-    const base::DictionaryValue* value_dict = NULL;
-    if (!it->value->GetAsDictionary(&value_dict) || value_dict->empty())
-      return;
-
-    std::string audio_device, video_device;
-    value_dict->GetString(kAudioKey, &audio_device);
-    value_dict->GetString(kVideoKey, &video_device);
-    // Add the exception to the new microphone content setting.
-    if (!audio_device.empty()) {
-      SetWebsiteSetting(it->primary_pattern,
-                        it->secondary_pattern,
-                        CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC,
-                        std::string(),
-                        new base::FundamentalValue(CONTENT_SETTING_ALLOW));
-    }
-    // Add the exception to the new camera content setting.
-    if (!video_device.empty()) {
-      SetWebsiteSetting(it->primary_pattern,
-                        it->secondary_pattern,
-                        CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA,
-                        std::string(),
-                        new base::FundamentalValue(CONTENT_SETTING_ALLOW));
-    }
+  const base::DictionaryValue* last_used_dictionary = NULL;
+  found = settings_dictionary->GetDictionaryWithoutPathExpansion(
+      kLastUsed, &last_used_dictionary);
 
-    // Remove the old exception in CONTENT_SETTINGS_TYPE_MEDIASTREAM.
-    SetWebsiteSetting(it->primary_pattern,
-                      it->secondary_pattern,
-                      CONTENT_SETTINGS_TYPE_MEDIASTREAM,
-                      std::string(),
-                      NULL);
-  }
+  if (!found)
+    return base::Time();
+
+  double last_used_time;
+  found = last_used_dictionary->GetDoubleWithoutPathExpansion(
+      GetTypeName(content_type), &last_used_time);
+
+  if (!found)
+    return base::Time();
+
+  return base::Time::FromDoubleT(last_used_time);
+}
+
+size_t ContentSettingsPref::GetNumExceptions() {
+  return value_map_.size();
+}
+
+void ContentSettingsPref::SetClockForTesting(base::Clock* clock) {
+  clock_ = clock;
 }
 
-void PrefProvider::ReadContentSettingsFromPref() {
+void ContentSettingsPref::ReadContentSettingsFromPref() {
   // |DictionaryPrefUpdate| sends out notifications when destructed. This
   // construction order ensures |AutoLock| gets destroyed first and |lock_| is
   // not held when the notifications are sent. Also, |auto_reset| must be still
@@ -484,22 +402,97 @@ void PrefProvider::ReadContentSettingsFromPref() {
                        cookies_session_only_exception_count);
 }
 
-void PrefProvider::OnContentSettingsPatternPairsChanged() {
-  DCHECK(CalledOnValidThread());
+void ContentSettingsPref::OnContentSettingsPatternPairsChanged() {
+  DCHECK(thread_checker_.CalledOnValidThread());
 
   if (updating_preferences_)
     return;
 
   ReadContentSettingsFromPref();
 
-  NotifyObservers(ContentSettingsPattern(),
-                  ContentSettingsPattern(),
-                  CONTENT_SETTINGS_TYPE_DEFAULT,
-                  std::string());
+  notify_callback_.Run(ContentSettingsPattern(),
+                       ContentSettingsPattern(),
+                       CONTENT_SETTINGS_TYPE_DEFAULT,
+                       std::string());
+}
+
+void ContentSettingsPref::UpdatePref(
+    const ContentSettingsPattern& primary_pattern,
+    const ContentSettingsPattern& secondary_pattern,
+    ContentSettingsType content_type,
+    const ResourceIdentifier& resource_identifier,
+    const base::Value* value) {
+  // Ensure that |lock_| is not held by this thread, since this function will
+  // send out notifications (by |~DictionaryPrefUpdate|).
+  AssertLockNotHeld();
+
+  base::AutoReset<bool> auto_reset(&updating_preferences_, true);
+  {
+    DictionaryPrefUpdate update(prefs_,
+                                prefs::kContentSettingsPatternPairs);
+    base::DictionaryValue* pattern_pairs_settings = update.Get();
+
+    // Get settings dictionary for the given patterns.
+    std::string pattern_str(CreatePatternString(primary_pattern,
+                                                secondary_pattern));
+    base::DictionaryValue* settings_dictionary = NULL;
+    bool found = pattern_pairs_settings->GetDictionaryWithoutPathExpansion(
+        pattern_str, &settings_dictionary);
+
+    if (!found && value) {
+      settings_dictionary = new base::DictionaryValue;
+      pattern_pairs_settings->SetWithoutPathExpansion(
+          pattern_str, settings_dictionary);
+    }
+
+    if (settings_dictionary) {
+      std::string res_dictionary_path;
+      if (GetResourceTypeName(content_type, &res_dictionary_path) &&
+          !resource_identifier.empty()) {
+        base::DictionaryValue* resource_dictionary = NULL;
+        found = settings_dictionary->GetDictionary(
+            res_dictionary_path, &resource_dictionary);
+        if (!found) {
+          if (value == NULL)
+            return;  // Nothing to remove. Exit early.
+          resource_dictionary = new base::DictionaryValue;
+          settings_dictionary->Set(res_dictionary_path, resource_dictionary);
+        }
+        // Update resource dictionary.
+        if (value == NULL) {
+          resource_dictionary->RemoveWithoutPathExpansion(resource_identifier,
+                                                          NULL);
+          if (resource_dictionary->empty()) {
+            settings_dictionary->RemoveWithoutPathExpansion(
+                res_dictionary_path, NULL);
+          }
+        } else {
+          resource_dictionary->SetWithoutPathExpansion(
+              resource_identifier, value->DeepCopy());
+        }
+      } else {
+        // Update settings dictionary.
+        std::string setting_path = GetTypeName(content_type);
+        if (value == NULL) {
+          settings_dictionary->RemoveWithoutPathExpansion(setting_path,
+                                                          NULL);
+          settings_dictionary->RemoveWithoutPathExpansion(kLastUsed, NULL);
+        } else {
+          settings_dictionary->SetWithoutPathExpansion(
+              setting_path, value->DeepCopy());
+        }
+      }
+      // Remove the settings dictionary if it is empty.
+      if (settings_dictionary->empty()) {
+        pattern_pairs_settings->RemoveWithoutPathExpansion(
+            pattern_str, NULL);
+      }
+    }
+  }
 }
 
 // static
-void PrefProvider::CanonicalizeContentSettingsExceptions(
+void ContentSettingsPref::CanonicalizeContentSettingsExceptions(
     base::DictionaryValue* all_settings_dictionary) {
   DCHECK(all_settings_dictionary);
 
@@ -554,94 +547,7 @@ void PrefProvider::CanonicalizeContentSettingsExceptions(
   }
 }
 
-void PrefProvider::ShutdownOnUIThread() {
-  DCHECK(CalledOnValidThread());
-  DCHECK(prefs_);
-  RemoveAllObservers();
-  pref_change_registrar_.RemoveAll();
-  prefs_ = NULL;
-}
-
-void PrefProvider::UpdateLastUsage(
-    const ContentSettingsPattern& primary_pattern,
-    const ContentSettingsPattern& secondary_pattern,
-    ContentSettingsType content_type) {
-  // Don't write if in incognito.
-  if (is_incognito_) {
-    return;
-  }
-
-  // Ensure that |lock_| is not held by this thread, since this function will
-  // send out notifications (by |~DictionaryPrefUpdate|).
-  AssertLockNotHeld();
-
-  base::AutoReset<bool> auto_reset(&updating_preferences_, true);
-  {
-    DictionaryPrefUpdate update(prefs_, prefs::kContentSettingsPatternPairs);
-    base::DictionaryValue* pattern_pairs_settings = update.Get();
-
-    std::string pattern_str(
-        CreatePatternString(primary_pattern, secondary_pattern));
-    base::DictionaryValue* settings_dictionary = NULL;
-    bool found = pattern_pairs_settings->GetDictionaryWithoutPathExpansion(
-        pattern_str, &settings_dictionary);
-
-    if (!found) {
-      settings_dictionary = new base::DictionaryValue;
-      pattern_pairs_settings->SetWithoutPathExpansion(pattern_str,
-                                                      settings_dictionary);
-    }
-
-    base::DictionaryValue* last_used_dictionary = NULL;
-    found = settings_dictionary->GetDictionaryWithoutPathExpansion(
-        kLastUsed, &last_used_dictionary);
-
-    if (!found) {
-      last_used_dictionary = new base::DictionaryValue;
-      settings_dictionary->SetWithoutPathExpansion(kLastUsed,
-                                                   last_used_dictionary);
-    }
-
-    std::string settings_path = GetTypeName(content_type);
-    last_used_dictionary->Set(
-        settings_path, new base::FundamentalValue(clock_->Now().ToDoubleT()));
-  }
-}
-
-base::Time PrefProvider::GetLastUsage(
-    const ContentSettingsPattern& primary_pattern,
-    const ContentSettingsPattern& secondary_pattern,
-    ContentSettingsType content_type) {
-  const base::DictionaryValue* pattern_pairs_settings =
-      prefs_->GetDictionary(prefs::kContentSettingsPatternPairs);
-  std::string pattern_str(
-      CreatePatternString(primary_pattern, secondary_pattern));
-
-  const base::DictionaryValue* settings_dictionary = NULL;
-  bool found = pattern_pairs_settings->GetDictionaryWithoutPathExpansion(
-      pattern_str, &settings_dictionary);
-
-  if (!found)
-    return base::Time();
-
-  const base::DictionaryValue* last_used_dictionary = NULL;
-  found = settings_dictionary->GetDictionaryWithoutPathExpansion(
-      kLastUsed, &last_used_dictionary);
-
-  if (!found)
-    return base::Time();
-
-  double last_used_time;
-  found = last_used_dictionary->GetDoubleWithoutPathExpansion(
-      GetTypeName(content_type), &last_used_time);
-
-  if (!found)
-    return base::Time();
-
-  return base::Time::FromDoubleT(last_used_time);
-}
-
-void PrefProvider::AssertLockNotHeld() const {
+void ContentSettingsPref::AssertLockNotHeld() const {
 #if !defined(NDEBUG)
   // |Lock::Acquire()| will assert if the lock is held by this thread.
   lock_.Acquire();
@@ -649,8 +555,4 @@ void PrefProvider::AssertLockNotHeld() const {
 #endif
 }
 
-void PrefProvider::SetClockForTesting(scoped_ptr<base::Clock> clock) {
-  clock_ = clock.Pass();
-}
-
 }  // namespace content_settings