src/extensions/common/features/complex_feature.cc

   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 #include "extensions/common/features/complex_feature.h"
   6
   7 namespace extensions {
   8
   9 ComplexFeature::ComplexFeature(scoped_ptr<FeatureList> features) {
  10   DCHECK_GT(features->size(), 0UL);
  11   features_.swap(*features);
  12   no_parent_ = features_[0]->no_parent();
  13
  14 #if !defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)
  15   // Verify GetContexts, IsInternal, & IsBlockedInServiceWorker are consistent
  16   // across all features.
  17   std::set<Feature::Context>* first_contexts = features_[0]->GetContexts();
  18   bool first_is_internal = features_[0]->IsInternal();
  19   bool first_blocked_in_service_worker =
  20       features_[0]->IsBlockedInServiceWorker();
  21   for (FeatureList::const_iterator it = features_.begin() + 1;
  22        it != features_.end();
  23        ++it) {
  24     DCHECK(*first_contexts == *(*it)->GetContexts())
  25         << "Complex feature must have consistent values of "
  26            "contexts across all sub features.";
  27     DCHECK(first_is_internal == (*it)->IsInternal())
  28         << "Complex feature must have consistent values of "
  29            "internal across all sub features.";
  30     DCHECK(first_blocked_in_service_worker == (*it)->IsBlockedInServiceWorker())
  31         << "Complex feature must have consistent values of "
  32            "blocked_in_service_worker across all sub features.";
  33     DCHECK(no_parent_ == (*it)->no_parent())
  34         << "Complex feature must have consistent values of "
  35            "no_parent across all sub features.";
  36   }
  37 #endif
  38 }
  39
  40 ComplexFeature::~ComplexFeature() {
  41 }
  42
  43 Feature::Availability ComplexFeature::IsAvailableToManifest(
  44     const std::string& extension_id,
  45     Manifest::Type type,
  46     Manifest::Location location,
  47     int manifest_version,
  48     Platform platform) const {
  49   Feature::Availability first_availability =
  50       features_[0]->IsAvailableToManifest(
  51           extension_id, type, location, manifest_version, platform);
  52   if (first_availability.is_available())
  53     return first_availability;
  54
  55   for (FeatureList::const_iterator it = features_.begin() + 1;
  56        it != features_.end(); ++it) {
  57     Availability availability = (*it)->IsAvailableToManifest(
  58         extension_id, type, location, manifest_version, platform);
  59     if (availability.is_available())
  60       return availability;
  61   }
  62   // If none of the SimpleFeatures are available, we return the availability
  63   // info of the first SimpleFeature that was not available.
  64   return first_availability;
  65 }
  66
  67 Feature::Availability ComplexFeature::IsAvailableToContext(
  68     const Extension* extension,
  69     Context context,
  70     const GURL& url,
  71     Platform platform) const {
  72   Feature::Availability first_availability =
  73       features_[0]->IsAvailableToContext(extension, context, url, platform);
  74   if (first_availability.is_available())
  75     return first_availability;
  76
  77   for (FeatureList::const_iterator it = features_.begin() + 1;
  78        it != features_.end(); ++it) {
  79     Availability availability =
  80         (*it)->IsAvailableToContext(extension, context, url, platform);
  81     if (availability.is_available())
  82       return availability;
  83   }
  84   // If none of the SimpleFeatures are available, we return the availability
  85   // info of the first SimpleFeature that was not available.
  86   return first_availability;
  87 }
  88
  89 bool ComplexFeature::IsIdInBlacklist(const std::string& extension_id) const {
  90   for (FeatureList::const_iterator it = features_.begin();
  91        it != features_.end();
  92        ++it) {
  93     if ((*it)->IsIdInBlacklist(extension_id))
  94       return true;
  95   }
  96   return false;
  97 }
  98
  99 bool ComplexFeature::IsIdInWhitelist(const std::string& extension_id) const {
 100   for (FeatureList::const_iterator it = features_.begin();
 101        it != features_.end();
 102        ++it) {
 103     if ((*it)->IsIdInWhitelist(extension_id))
 104       return true;
 105   }
 106   return false;
 107 }
 108
 109 bool ComplexFeature::IsBlockedInServiceWorker() const {
 110   // Constructor verifies that composed features are consistent, thus we can
 111   // return just the first feature's value.
 112   return features_[0]->IsBlockedInServiceWorker();
 113 }
 114
 115 std::set<Feature::Context>* ComplexFeature::GetContexts() {
 116   // TODO(justinlin): Current use cases for ComplexFeatures are simple (e.g.
 117   // allow API in dev channel for everyone but stable channel for a whitelist),
 118   // but if they get more complicated, we need to return some meaningful context
 119   // set. Either that or remove this method from the Feature interface.
 120   return features_[0]->GetContexts();
 121 }
 122
 123 bool ComplexFeature::IsInternal() const {
 124   // TODO(justinlin): Same as the above TODO.
 125   return features_[0]->IsInternal();
 126 }
 127
 128 std::string ComplexFeature::GetAvailabilityMessage(AvailabilityResult result,
 129                                                    Manifest::Type type,
 130                                                    const GURL& url,
 131                                                    Context context) const {
 132   if (result == IS_AVAILABLE)
 133     return std::string();
 134
 135   // TODO(justinlin): Form some kind of combined availabilities/messages from
 136   // SimpleFeatures.
 137   return features_[0]->GetAvailabilityMessage(result, type, url, context);
 138 }
 139
 140 }  // namespace extensions