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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/common/event_filter.h"
#include <string>
#include <utility>
#include "base/logging.h"
#include "base/notreached.h"
#include "components/url_matcher/url_matcher_factory.h"
#include "extensions/common/mojom/event_dispatcher.mojom.h"
#include "ipc/ipc_message.h"
using url_matcher::URLMatcher;
using url_matcher::URLMatcherConditionSet;
using url_matcher::URLMatcherFactory;
namespace extensions {
EventFilter::EventMatcherEntry::EventMatcherEntry(
std::unique_ptr<EventMatcher> event_matcher,
URLMatcher* url_matcher,
const URLMatcherConditionSet::Vector& condition_sets)
: event_matcher_(std::move(event_matcher)), url_matcher_(url_matcher) {
condition_set_ids_.reserve(condition_sets.size());
for (const scoped_refptr<URLMatcherConditionSet>& condition_set :
condition_sets) {
condition_set_ids_.push_back(condition_set->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 (auto& matcher_map : event_matchers_) {
for (auto& matcher : matcher_map.second)
matcher.second->DontRemoveConditionSetsInDestructor();
}
}
EventFilter::MatcherID EventFilter::AddEventMatcher(
const std::string& event_name,
std::unique_ptr<EventMatcher> matcher) {
URLMatcherConditionSet::Vector condition_sets;
if (!CreateConditionSets(matcher.get(), &condition_sets))
return -1;
MatcherID id = next_id_++;
for (const scoped_refptr<URLMatcherConditionSet>& condition_set :
condition_sets) {
condition_set_id_to_event_matcher_id_.insert(
std::make_pair(condition_set->id(), id));
}
id_to_event_name_[id] = event_name;
event_matchers_[event_name][id] = std::make_unique<EventMatcherEntry>(
std::move(matcher), &url_matcher_, condition_sets);
return id;
}
EventMatcher* EventFilter::GetEventMatcher(MatcherID id) {
const std::string& event_name = GetEventName(id);
return event_matchers_[event_name][id]->event_matcher();
}
const std::string& EventFilter::GetEventName(MatcherID id) const {
auto it = id_to_event_name_.find(id);
CHECK(it != id_to_event_name_.end());
return it->second;
}
bool EventFilter::CreateConditionSets(
EventMatcher* matcher,
URLMatcherConditionSet::Vector* condition_sets) {
int url_filter_count = matcher->GetURLFilterCount();
if (url_filter_count == 0) {
// If there are no URL filters then we want to match all events, so create a
// URLFilter from an empty dictionary.
base::Value::Dict empty_dict;
return AddDictionaryAsConditionSet(empty_dict, condition_sets);
}
for (int i = 0; i < url_filter_count; i++) {
const base::Value::Dict* url_filter = matcher->GetURLFilter(i);
if (!url_filter)
return false;
if (!AddDictionaryAsConditionSet(*url_filter, condition_sets))
return false;
}
return true;
}
bool EventFilter::AddDictionaryAsConditionSet(
const base::Value::Dict& url_filter,
URLMatcherConditionSet::Vector* condition_sets) {
std::string error;
base::MatcherStringPattern::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) {
auto it = id_to_event_name_.find(id);
if (it == id_to_event_name_.end()) {
return "";
}
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 mojom::EventFilteringInfo& event_info,
int routing_id) const {
std::set<MatcherID> matchers;
auto it = event_matchers_.find(event_name);
if (it == event_matchers_.end())
return matchers;
const EventMatcherMap& matcher_map = it->second;
const GURL& url_to_match_against = event_info.url ? *event_info.url : GURL();
std::set<base::MatcherStringPattern::ID> matching_condition_set_ids =
url_matcher_.MatchURL(url_to_match_against);
for (const auto& id_key : matching_condition_set_ids) {
auto matcher_id = condition_set_id_to_event_matcher_id_.find(id_key);
if (matcher_id == condition_set_id_to_event_matcher_id_.end()) {
NOTREACHED() << "id not found in condition set map (" << id_key << ")";
}
MatcherID id = matcher_id->second;
auto 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();
// The context that installed the event listener should be the same context
// as the one where the event listener is called.
if (routing_id != MSG_ROUTING_NONE &&
event_matcher->routing_id() != routing_id) {
continue;
}
if (event_matcher->MatchNonURLCriteria(event_info)) {
CHECK(!event_matcher->HasURLFilters() || event_info.url);
matchers.insert(id);
}
}
return matchers;
}
int EventFilter::GetMatcherCountForEventForTesting(
const std::string& name) const {
auto it = event_matchers_.find(name);
return it != event_matchers_.end() ? it->second.size() : 0;
}
} // namespace extensions
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