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// 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/common/extensions/event_filter.h"
#include "extensions/common/matcher/url_matcher_factory.h"
namespace extensions {
EventFilter::EventMatcherEntry::EventMatcherEntry(
scoped_ptr<EventMatcher> event_matcher,
URLMatcher* url_matcher,
const URLMatcherConditionSet::Vector& condition_sets)
: event_matcher_(event_matcher.Pass()),
url_matcher_(url_matcher) {
for (URLMatcherConditionSet::Vector::const_iterator it =
condition_sets.begin(); it != condition_sets.end(); it++)
condition_set_ids_.push_back((*it)->id());
url_matcher_->AddConditionSets(condition_sets);
}
EventFilter::EventMatcherEntry::~EventMatcherEntry() {
url_matcher_->RemoveConditionSets(condition_set_ids_);
}
void EventFilter::EventMatcherEntry::DontRemoveConditionSetsInDestructor() {
condition_set_ids_.clear();
}
EventFilter::EventFilter()
: next_id_(0),
next_condition_set_id_(0) {
}
EventFilter::~EventFilter() {
// Normally when an event matcher entry is removed from event_matchers_ it
// will remove its condition sets from url_matcher_, but as url_matcher_ is
// being destroyed anyway there is no need to do that step here.
for (EventMatcherMultiMap::iterator it = event_matchers_.begin();
it != event_matchers_.end(); it++) {
for (EventMatcherMap::iterator it2 = it->second.begin();
it2 != it->second.end(); it2++) {
it2->second->DontRemoveConditionSetsInDestructor();
}
}
}
EventFilter::MatcherID
EventFilter::AddEventMatcher(const std::string& event_name,
scoped_ptr<EventMatcher> matcher) {
MatcherID id = next_id_++;
URLMatcherConditionSet::Vector condition_sets;
if (!CreateConditionSets(id, matcher.get(), &condition_sets))
return -1;
for (URLMatcherConditionSet::Vector::iterator it = condition_sets.begin();
it != condition_sets.end(); it++) {
condition_set_id_to_event_matcher_id_.insert(
std::make_pair((*it)->id(), id));
}
id_to_event_name_[id] = event_name;
event_matchers_[event_name][id] = linked_ptr<EventMatcherEntry>(
new EventMatcherEntry(matcher.Pass(), &url_matcher_, condition_sets));
return id;
}
EventMatcher* EventFilter::GetEventMatcher(MatcherID id) {
DCHECK(id_to_event_name_.find(id) != id_to_event_name_.end());
const std::string& event_name = id_to_event_name_[id];
return event_matchers_[event_name][id]->event_matcher();
}
const std::string& EventFilter::GetEventName(MatcherID id) {
DCHECK(id_to_event_name_.find(id) != id_to_event_name_.end());
return id_to_event_name_[id];
}
bool EventFilter::CreateConditionSets(
MatcherID id,
EventMatcher* matcher,
URLMatcherConditionSet::Vector* condition_sets) {
if (matcher->GetURLFilterCount() == 0) {
// If there are no URL filters then we want to match all events, so create a
// URLFilter from an empty dictionary.
base::DictionaryValue empty_dict;
return AddDictionaryAsConditionSet(&empty_dict, condition_sets);
}
for (int i = 0; i < matcher->GetURLFilterCount(); i++) {
base::DictionaryValue* url_filter;
if (!matcher->GetURLFilter(i, &url_filter))
return false;
if (!AddDictionaryAsConditionSet(url_filter, condition_sets))
return false;
}
return true;
}
bool EventFilter::AddDictionaryAsConditionSet(
base::DictionaryValue* url_filter,
URLMatcherConditionSet::Vector* condition_sets) {
std::string error;
URLMatcherConditionSet::ID condition_set_id = next_condition_set_id_++;
condition_sets->push_back(URLMatcherFactory::CreateFromURLFilterDictionary(
url_matcher_.condition_factory(),
url_filter,
condition_set_id,
&error));
if (!error.empty()) {
LOG(ERROR) << "CreateFromURLFilterDictionary failed: " << error;
url_matcher_.ClearUnusedConditionSets();
condition_sets->clear();
return false;
}
return true;
}
std::string EventFilter::RemoveEventMatcher(MatcherID id) {
std::map<MatcherID, std::string>::iterator it = id_to_event_name_.find(id);
std::string event_name = it->second;
// EventMatcherEntry's destructor causes the condition set ids to be removed
// from url_matcher_.
event_matchers_[event_name].erase(id);
id_to_event_name_.erase(it);
return event_name;
}
std::set<EventFilter::MatcherID> EventFilter::MatchEvent(
const std::string& event_name, const EventFilteringInfo& event_info) {
std::set<MatcherID> matchers;
EventMatcherMultiMap::iterator it = event_matchers_.find(event_name);
if (it == event_matchers_.end())
return matchers;
EventMatcherMap& matcher_map = it->second;
GURL url_to_match_against = event_info.has_url() ? event_info.url() : GURL();
std::set<URLMatcherConditionSet::ID> matching_condition_set_ids =
url_matcher_.MatchURL(url_to_match_against);
for (std::set<URLMatcherConditionSet::ID>::iterator it =
matching_condition_set_ids.begin();
it != matching_condition_set_ids.end(); it++) {
std::map<URLMatcherConditionSet::ID, MatcherID>::iterator matcher_id =
condition_set_id_to_event_matcher_id_.find(*it);
if (matcher_id == condition_set_id_to_event_matcher_id_.end()) {
NOTREACHED() << "id not found in condition set map (" << (*it) << ")";
continue;
}
MatcherID id = matcher_id->second;
EventMatcherMap::iterator matcher_entry = matcher_map.find(id);
if (matcher_entry == matcher_map.end()) {
// Matcher must be for a different event.
continue;
}
const EventMatcher* event_matcher = matcher_entry->second->event_matcher();
if (event_matcher->MatchNonURLCriteria(event_info)) {
CHECK(!event_matcher->HasURLFilters() || event_info.has_url());
matchers.insert(id);
}
}
return matchers;
}
int EventFilter::GetMatcherCountForEvent(const std::string& name) {
EventMatcherMultiMap::const_iterator it = event_matchers_.find(name);
if (it == event_matchers_.end())
return 0;
return it->second.size();
}
} // namespace extensions
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