Implementation of beginning of Declarative Web Request API backend

chrome/browser/extensions/api/declarative_webrequest/webrequest_rules_registry.cc

+// Copyright (c) 2012 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 "chrome/browser/extensions/api/declarative_webrequest/webrequest_rules_registry.h"
+
+#include "chrome/browser/extensions/api/declarative_webrequest/webrequest_condition.h"
+#include "net/url_request/url_request.h"
+
+namespace extensions {
+
+WebRequestRulesRegistry::WebRequestRulesRegistry() {}
+
+WebRequestRulesRegistry::~WebRequestRulesRegistry() {}
+
+std::set<WebRequestRule::GlobalRuleId>
+WebRequestRulesRegistry::GetMatches(net::URLRequest* request) {
+  std::set<WebRequestRule::GlobalRuleId> result;
+
+  // Figure out for which rules the URL match conditions were fulfilled.
+  typedef std::set<URLMatcherConditionSet::ID> URLMatches;
+  URLMatches url_matches = url_matcher_.MatchURL(request->url());
+
+  // Then we need to check for each of these, whether the other
+  // WebRequestConditionAttributes are also fulfilled.
+  for (URLMatches::iterator url_match = url_matches.begin();
+       url_match != url_matches.end(); ++url_match) {
+    RuleTriggers::iterator rule_trigger = rule_triggers_.find(*url_match);
+    CHECK(rule_trigger != rule_triggers_.end());
+
+    WebRequestRule* rule = rule_trigger->second;
+    if (rule->conditions().IsFulfilled(*url_match, request))
+      result.insert(rule->id());
+  }
+
+  return result;
+}
+
+std::string WebRequestRulesRegistry::AddRulesImpl(
+    const std::string& extension_id,
+    const std::vector<linked_ptr<RulesRegistry::Rule> >& rules) {
+  std::string error;
+  RulesMap new_webrequest_rules;
+
+  for (std::vector<linked_ptr<RulesRegistry::Rule> >::const_iterator rule =
+       rules.begin(); rule != rules.end(); ++rule) {
+    WebRequestRule::GlobalRuleId rule_id(extension_id, *(*rule)->id);
+    DCHECK(webrequest_rules_.find(rule_id) == webrequest_rules_.end());
+
+    scoped_ptr<WebRequestRule> webrequest_rule(
+        WebRequestRule::Create(url_matcher_.condition_factory(), extension_id,
+                               *rule, &error));
+    if (!error.empty()) {
+      // We don't return here, because we want to clear temporary
+      // condition sets in the url_matcher_.
+      break;
+    }
+
+    new_webrequest_rules[rule_id] = make_linked_ptr(webrequest_rule.release());
+  }
+
+  if (!error.empty()) {
+    // Clean up temporary condition sets created during rule creation.
+    url_matcher_.ClearUnusedConditionSets();
+    return error;
+  }
+
+  // Wohoo, everything worked fine.
+  webrequest_rules_.insert(new_webrequest_rules.begin(),
+                           new_webrequest_rules.end());
+
+  // Create the triggers.
+  for (RulesMap::iterator i = new_webrequest_rules.begin();
+       i != new_webrequest_rules.end(); ++i) {
+    std::vector<URLMatcherConditionSet> url_condition_sets;
+    const WebRequestConditionSet& conditions = i->second->conditions();
+    conditions.GetURLMatcherConditionSets(&url_condition_sets);
+    for (std::vector<URLMatcherConditionSet>::iterator j =
+        url_condition_sets.begin(); j != url_condition_sets.end(); ++j) {
+      rule_triggers_[j->id()] = i->second.get();
+    }
+  }
+
+  // Register url patterns in url_matcher_.
+  std::vector<URLMatcherConditionSet> all_new_condition_sets;
+  for (RulesMap::iterator i = new_webrequest_rules.begin();
+       i != new_webrequest_rules.end(); ++i) {
+    i->second->conditions().GetURLMatcherConditionSets(&all_new_condition_sets);
+  }
+  url_matcher_.AddConditionSets(all_new_condition_sets);
+
+  return "";
+}
+
+std::string WebRequestRulesRegistry::RemoveRulesImpl(
+    const std::string& extension_id,
+    const std::vector<std::string>& rule_identifiers) {
+  return "TODO";
+}
+
+std::string WebRequestRulesRegistry::RemoveAllRulesImpl(
+    const std::string& extension_id) {
+  return "TODO";
+}
+
+content::BrowserThread::ID WebRequestRulesRegistry::GetOwnerThread() const {
+  return content::BrowserThread::IO;
+}
+
+}  // namespace extensions