extensions/browser/api/declarative_webrequest/webrequest_rules_registry.h

   1 // Copyright (c) 2012 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 EXTENSIONS_BROWSER_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_RULES_REGISTRY_H_
   6 #define EXTENSIONS_BROWSER_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_RULES_REGISTRY_H_
   7
   8 #include <list>
   9 #include <map>
  10 #include <set>
  11 #include <string>
  12 #include <vector>
  13
  14 #include "base/gtest_prod_util.h"
  15 #include "base/memory/linked_ptr.h"
  16 #include "base/memory/ref_counted.h"
  17 #include "base/memory/scoped_ptr.h"
  18 #include "base/time/time.h"
  19 #include "components/url_matcher/url_matcher.h"
  20 #include "extensions/browser/api/declarative/declarative_rule.h"
  21 #include "extensions/browser/api/declarative/rules_registry.h"
  22 #include "extensions/browser/api/declarative_webrequest/request_stage.h"
  23 #include "extensions/browser/api/declarative_webrequest/webrequest_action.h"
  24 #include "extensions/browser/api/declarative_webrequest/webrequest_condition.h"
  25 #include "extensions/browser/info_map.h"
  26
  27 class WebRequestPermissions;
  28
  29 namespace content {
  30 class BrowserContext;
  31 }
  32
  33 namespace extension_web_request_api_helpers {
  34 struct EventResponseDelta;
  35 }
  36
  37 namespace net {
  38 class URLRequest;
  39 }
  40
  41 namespace extensions {
  42
  43 class RulesRegistryService;
  44
  45 typedef linked_ptr<extension_web_request_api_helpers::EventResponseDelta>
  46     LinkedPtrEventResponseDelta;
  47 typedef DeclarativeRule<WebRequestCondition, WebRequestAction> WebRequestRule;
  48
  49 // The WebRequestRulesRegistry is responsible for managing
  50 // the internal representation of rules for the Declarative Web Request API.
  51 //
  52 // Here is the high level overview of this functionality:
  53 //
  54 // api::events::Rule consists of Conditions and Actions, these are
  55 // represented as a WebRequestRule with WebRequestConditions and
  56 // WebRequestRuleActions.
  57 //
  58 // WebRequestConditions represent JSON dictionaries as the following:
  59 // {
  60 //   'instanceType': 'URLMatcher',
  61 //   'host_suffix': 'example.com',
  62 //   'path_prefix': '/query',
  63 //   'scheme': 'http'
  64 // }
  65 //
  66 // The evaluation of URL related condition attributes (host_suffix, path_prefix)
  67 // is delegated to a URLMatcher, because this is capable of evaluating many
  68 // of such URL related condition attributes in parallel.
  69 //
  70 // For this, the URLRequestCondition has a URLMatcherConditionSet, which
  71 // represents the {'host_suffix': 'example.com', 'path_prefix': '/query'} part.
  72 // We will then ask the URLMatcher, whether a given URL
  73 // "http://www.example.com/query/" has any matches, and the URLMatcher
  74 // will respond with the URLMatcherConditionSet::ID. We can map this
  75 // to the WebRequestRule and check whether also the other conditions (in this
  76 // example 'scheme': 'http') are fulfilled.
  77 class WebRequestRulesRegistry : public RulesRegistry {
  78  public:
  79   // |cache_delegate| can be NULL. In that case it constructs the registry with
  80   // storage functionality suspended.
  81   WebRequestRulesRegistry(content::BrowserContext* browser_context,
  82                           RulesCacheDelegate* cache_delegate,
  83                           int rules_registry_id);
  84
  85   // TODO(battre): This will become an implementation detail, because we need
  86   // a way to also execute the actions of the rules.
  87   std::set<const WebRequestRule*> GetMatches(
  88       const WebRequestData& request_data_without_ids) const;
  89
  90   // Returns which modifications should be executed on the network request
  91   // according to the rules registered in this registry.
  92   std::list<LinkedPtrEventResponseDelta> CreateDeltas(
  93       const InfoMap* extension_info_map,
  94       const WebRequestData& request_data,
  95       bool crosses_incognito);
  96
  97   // Implementation of RulesRegistry:
  98   std::string AddRulesImpl(
  99       const std::string& extension_id,
 100       const std::vector<linked_ptr<api::events::Rule>>& rules) override;
 101   std::string RemoveRulesImpl(
 102       const std::string& extension_id,
 103       const std::vector<std::string>& rule_identifiers) override;
 104   std::string RemoveAllRulesImpl(const std::string& extension_id) override;
 105
 106   // Returns true if this object retains no allocated data. Only for debugging.
 107   bool IsEmpty() const;
 108
 109  protected:
 110   ~WebRequestRulesRegistry() override;
 111
 112   // Virtual for testing:
 113   virtual base::Time GetExtensionInstallationTime(
 114       const std::string& extension_id) const;
 115   virtual void ClearCacheOnNavigation();
 116
 117   void SetExtensionInfoMapForTesting(
 118       scoped_refptr<InfoMap> extension_info_map) {
 119     extension_info_map_ = extension_info_map;
 120   }
 121
 122   const std::set<const WebRequestRule*>&
 123   rules_with_untriggered_conditions_for_test() const {
 124     return rules_with_untriggered_conditions_;
 125   }
 126
 127  private:
 128   FRIEND_TEST_ALL_PREFIXES(WebRequestRulesRegistrySimpleTest, StageChecker);
 129   FRIEND_TEST_ALL_PREFIXES(WebRequestRulesRegistrySimpleTest,
 130                            HostPermissionsChecker);
 131
 132   typedef std::map<url_matcher::URLMatcherConditionSet::ID,
 133                    const WebRequestRule*> RuleTriggers;
 134   typedef std::map<WebRequestRule::RuleId, linked_ptr<const WebRequestRule>>
 135       RulesMap;
 136   typedef std::set<url_matcher::URLMatcherConditionSet::ID> URLMatches;
 137   typedef std::set<const WebRequestRule*> RuleSet;
 138
 139   // This bundles all consistency checkers. Returns true in case of consistency
 140   // and MUST set |error| otherwise.
 141   static bool Checker(const Extension* extension,
 142                       const WebRequestConditionSet* conditions,
 143                       const WebRequestActionSet* actions,
 144                       std::string* error);
 145
 146   // Check that the |extension| has host permissions for all URLs if actions
 147   // requiring them are present.
 148   static bool HostPermissionsChecker(const Extension* extension,
 149                                      const WebRequestActionSet* actions,
 150                                      std::string* error);
 151
 152   // Check that every action is applicable in the same request stage as at
 153   // least one condition.
 154   static bool StageChecker(const WebRequestConditionSet* conditions,
 155                            const WebRequestActionSet* actions,
 156                            std::string* error);
 157
 158   // Helper for RemoveRulesImpl and RemoveAllRulesImpl. Call this before
 159   // deleting |rule| from one of the maps in |webrequest_rules_|. It will erase
 160   // the rule from |rule_triggers_| and |rules_with_untriggered_conditions_|,
 161   // and add every of the rule's URLMatcherConditionSet to
 162   // |remove_from_url_matcher|, so that the caller can remove them from the
 163   // matcher later.
 164   void CleanUpAfterRule(const WebRequestRule* rule,
 165                         std::vector<url_matcher::URLMatcherConditionSet::ID>*
 166                             remove_from_url_matcher);
 167
 168   // This is a helper function to GetMatches. Rules triggered by |url_matches|
 169   // get added to |result| if one of their conditions is fulfilled.
 170   // |request_data| gets passed to IsFulfilled of the rules' condition sets.
 171   void AddTriggeredRules(const URLMatches& url_matches,
 172                          const WebRequestCondition::MatchData& request_data,
 173                          RuleSet* result) const;
 174
 175   // Map that tells us which WebRequestRule may match under the condition that
 176   // the URLMatcherConditionSet::ID was returned by the |url_matcher_|.
 177   RuleTriggers rule_triggers_;
 178
 179   // These rules contain condition sets with conditions without URL attributes.
 180   // Such conditions are not triggered by URL matcher, so we need to test them
 181   // separately.
 182   std::set<const WebRequestRule*> rules_with_untriggered_conditions_;
 183
 184   std::map<WebRequestRule::ExtensionId, RulesMap> webrequest_rules_;
 185
 186   url_matcher::URLMatcher url_matcher_;
 187
 188   content::BrowserContext* browser_context_;
 189   scoped_refptr<InfoMap> extension_info_map_;
 190
 191   DISALLOW_COPY_AND_ASSIGN(WebRequestRulesRegistry);
 192 };
 193
 194 }  // namespace extensions
 195
 196 #endif  // EXTENSIONS_BROWSER_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_RULES_REGISTRY_H_