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.
5 #ifndef EXTENSIONS_BROWSER_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_RULES_REGISTRY_H_
6 #define EXTENSIONS_BROWSER_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_RULES_REGISTRY_H_
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"
27 class WebRequestPermissions;
33 namespace extension_web_request_api_helpers {
34 struct EventResponseDelta;
41 namespace extensions {
43 class RulesRegistryService;
45 typedef linked_ptr<extension_web_request_api_helpers::EventResponseDelta>
46 LinkedPtrEventResponseDelta;
47 typedef DeclarativeRule<WebRequestCondition, WebRequestAction> WebRequestRule;
49 // The WebRequestRulesRegistry is responsible for managing
50 // the internal representation of rules for the Declarative Web Request API.
52 // Here is the high level overview of this functionality:
54 // RulesRegistry::Rule consists of Conditions and Actions, these are
55 // represented as a WebRequestRule with WebRequestConditions and
56 // WebRequestRuleActions.
58 // WebRequestConditions represent JSON dictionaries as the following:
60 // 'instanceType': 'URLMatcher',
61 // 'host_suffix': 'example.com',
62 // 'path_prefix': '/query',
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.
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 {
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 const WebViewKey& webview_key);
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;
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);
97 // Implementation of RulesRegistry:
98 virtual std::string AddRulesImpl(
99 const std::string& extension_id,
100 const std::vector<linked_ptr<RulesRegistry::Rule> >& rules) OVERRIDE;
101 virtual std::string RemoveRulesImpl(
102 const std::string& extension_id,
103 const std::vector<std::string>& rule_identifiers) OVERRIDE;
104 virtual std::string RemoveAllRulesImpl(
105 const std::string& extension_id) OVERRIDE;
107 // Returns true if this object retains no allocated data. Only for debugging.
108 bool IsEmpty() const;
111 virtual ~WebRequestRulesRegistry();
113 // Virtual for testing:
114 virtual base::Time GetExtensionInstallationTime(
115 const std::string& extension_id) const;
116 virtual void ClearCacheOnNavigation();
118 void SetExtensionInfoMapForTesting(
119 scoped_refptr<InfoMap> extension_info_map) {
120 extension_info_map_ = extension_info_map;
123 const std::set<const WebRequestRule*>&
124 rules_with_untriggered_conditions_for_test() const {
125 return rules_with_untriggered_conditions_;
129 FRIEND_TEST_ALL_PREFIXES(WebRequestRulesRegistrySimpleTest, StageChecker);
130 FRIEND_TEST_ALL_PREFIXES(WebRequestRulesRegistrySimpleTest,
131 HostPermissionsChecker);
133 typedef std::map<url_matcher::URLMatcherConditionSet::ID, WebRequestRule*>
135 typedef std::map<WebRequestRule::RuleId, linked_ptr<WebRequestRule> >
137 typedef std::set<url_matcher::URLMatcherConditionSet::ID> URLMatches;
138 typedef std::set<const WebRequestRule*> RuleSet;
140 // This bundles all consistency checkers. Returns true in case of consistency
141 // and MUST set |error| otherwise.
142 static bool Checker(const Extension* extension,
143 const WebRequestConditionSet* conditions,
144 const WebRequestActionSet* actions,
147 // Check that the |extension| has host permissions for all URLs if actions
148 // requiring them are present.
149 static bool HostPermissionsChecker(const Extension* extension,
150 const WebRequestActionSet* actions,
153 // Check that every action is applicable in the same request stage as at
154 // least one condition.
155 static bool StageChecker(const WebRequestConditionSet* conditions,
156 const WebRequestActionSet* actions,
159 // Helper for RemoveRulesImpl and RemoveAllRulesImpl. Call this before
160 // deleting |rule| from one of the maps in |webrequest_rules_|. It will erase
161 // the rule from |rule_triggers_| and |rules_with_untriggered_conditions_|,
162 // and add every of the rule's URLMatcherConditionSet to
163 // |remove_from_url_matcher|, so that the caller can remove them from the
165 void CleanUpAfterRule(const WebRequestRule* rule,
166 std::vector<url_matcher::URLMatcherConditionSet::ID>*
167 remove_from_url_matcher);
169 // This is a helper function to GetMatches. Rules triggered by |url_matches|
170 // get added to |result| if one of their conditions is fulfilled.
171 // |request_data| gets passed to IsFulfilled of the rules' condition sets.
172 void AddTriggeredRules(const URLMatches& url_matches,
173 const WebRequestCondition::MatchData& request_data,
174 RuleSet* result) const;
176 // Map that tells us which WebRequestRule may match under the condition that
177 // the URLMatcherConditionSet::ID was returned by the |url_matcher_|.
178 RuleTriggers rule_triggers_;
180 // These rules contain condition sets with conditions without URL attributes.
181 // Such conditions are not triggered by URL matcher, so we need to test them
183 std::set<const WebRequestRule*> rules_with_untriggered_conditions_;
185 std::map<WebRequestRule::ExtensionId, RulesMap> webrequest_rules_;
187 url_matcher::URLMatcher url_matcher_;
189 content::BrowserContext* browser_context_;
190 scoped_refptr<InfoMap> extension_info_map_;
192 DISALLOW_COPY_AND_ASSIGN(WebRequestRulesRegistry);
195 } // namespace extensions
197 #endif // EXTENSIONS_BROWSER_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_RULES_REGISTRY_H_