Merge ExtensionImpl into EventBindings.

extensions/renderer/event_bindings.cc

 // Copyright 2014 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 "extensions/renderer/event_bindings.h"
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 35 matching lines @@
 // between 0 and 1.
 typedef std::map<std::string, linked_ptr<ValueCounter> >
     FilteredEventListenerCounts;
 
 // A map of extension IDs to filtered listener counts for that extension.
 base::LazyInstance<std::map<std::string, FilteredEventListenerCounts> >
     g_filtered_listener_counts = LAZY_INSTANCE_INITIALIZER;
 
 base::LazyInstance<EventFilter> g_event_filter = LAZY_INSTANCE_INITIALIZER;
 
-// TODO(koz): Merge this into EventBindings.
-class ExtensionImpl : public ObjectBackedNativeHandler {
- public:
-  explicit ExtensionImpl(Dispatcher* dispatcher, ScriptContext* context)
-      : ObjectBackedNativeHandler(context), dispatcher_(dispatcher) {
-    RouteFunction(
-        "AttachEvent",
-        base::Bind(&ExtensionImpl::AttachEvent, base::Unretained(this)));
-    RouteFunction(
-        "DetachEvent",
-        base::Bind(&ExtensionImpl::DetachEvent, base::Unretained(this)));
-    RouteFunction("AttachFilteredEvent",
-                  base::Bind(&ExtensionImpl::AttachFilteredEvent,
-                             base::Unretained(this)));
-    RouteFunction("DetachFilteredEvent",
-                  base::Bind(&ExtensionImpl::DetachFilteredEvent,
-                             base::Unretained(this)));
-    RouteFunction("MatchAgainstEventFilter",
-                  base::Bind(&ExtensionImpl::MatchAgainstEventFilter,
-                             base::Unretained(this)));
-  }
-
-  virtual ~ExtensionImpl() {}
-
-  // Attach an event name to an object.
-  void AttachEvent(const v8::FunctionCallbackInfo<v8::Value>& args) {
-    CHECK_EQ(1, args.Length());
-    CHECK(args[0]->IsString());
-
-    std::string event_name = *v8::String::Utf8Value(args[0]->ToString());
-
-    if (!dispatcher_->CheckContextAccessToExtensionAPI(event_name, context()))
-      return;
-
-    std::string extension_id = context()->GetExtensionID();
-    EventListenerCounts& listener_counts =
-        g_listener_counts.Get()[extension_id];
-    if (++listener_counts[event_name] == 1) {
-      content::RenderThread::Get()->Send(
-          new ExtensionHostMsg_AddListener(extension_id, event_name));
-    }
-
-    // This is called the first time the page has added a listener. Since
-    // the background page is the only lazy page, we know this is the first
-    // time this listener has been registered.
-    if (IsLazyBackgroundContext(context())) {
-      content::RenderThread::Get()->Send(
-          new ExtensionHostMsg_AddLazyListener(extension_id, event_name));
-    }
-  }
-
-  void DetachEvent(const v8::FunctionCallbackInfo<v8::Value>& args) {
-    CHECK_EQ(2, args.Length());
-    CHECK(args[0]->IsString());
-    CHECK(args[1]->IsBoolean());
-
-    std::string event_name = *v8::String::Utf8Value(args[0]);
-    bool is_manual = args[1]->BooleanValue();
-
-    std::string extension_id = context()->GetExtensionID();
-    EventListenerCounts& listener_counts =
-        g_listener_counts.Get()[extension_id];
-
-    if (--listener_counts[event_name] == 0) {
-      content::RenderThread::Get()->Send(
-          new ExtensionHostMsg_RemoveListener(extension_id, event_name));
-    }
-
-    // DetachEvent is called when the last listener for the context is
-    // removed. If the context is the background page, and it removes the
-    // last listener manually, then we assume that it is no longer interested
-    // in being awakened for this event.
-    if (is_manual && IsLazyBackgroundContext(context())) {
-      content::RenderThread::Get()->Send(
-          new ExtensionHostMsg_RemoveLazyListener(extension_id, event_name));
-    }
-  }
-
-  // MatcherID AttachFilteredEvent(string event_name, object filter)
-  // event_name - Name of the event to attach.
-  // filter - Which instances of the named event are we interested in.
-  // returns the id assigned to the listener, which will be returned from calls
-  // to MatchAgainstEventFilter where this listener matches.
-  void AttachFilteredEvent(const v8::FunctionCallbackInfo<v8::Value>& args) {
-    CHECK_EQ(2, args.Length());
-    CHECK(args[0]->IsString());
-    CHECK(args[1]->IsObject());
-
-    std::string event_name = *v8::String::Utf8Value(args[0]);
-
-    // This method throws an exception if it returns false.
-    if (!dispatcher_->CheckContextAccessToExtensionAPI(event_name, context()))
-      return;
-
-    std::string extension_id = context()->GetExtensionID();
-    if (extension_id.empty()) {
-      args.GetReturnValue().Set(static_cast<int32_t>(-1));
-      return;
-    }
-
-    scoped_ptr<base::DictionaryValue> filter;
-    scoped_ptr<content::V8ValueConverter> converter(
-        content::V8ValueConverter::create());
-
-    base::DictionaryValue* filter_dict = NULL;
-    base::Value* filter_value =
-        converter->FromV8Value(args[1]->ToObject(), context()->v8_context());
-    if (!filter_value) {
-      args.GetReturnValue().Set(static_cast<int32_t>(-1));
-      return;
-    }
-    if (!filter_value->GetAsDictionary(&filter_dict)) {
-      delete filter_value;
-      args.GetReturnValue().Set(static_cast<int32_t>(-1));
-      return;
-    }
-
-    filter.reset(filter_dict);
-    EventFilter& event_filter = g_event_filter.Get();
-    int id = event_filter.AddEventMatcher(event_name,
-                                          ParseEventMatcher(filter.get()));
-
-    // Only send IPCs the first time a filter gets added.
-    if (AddFilter(event_name, extension_id, filter.get())) {
-      bool lazy = IsLazyBackgroundContext(context());
-      content::RenderThread::Get()->Send(
-          new ExtensionHostMsg_AddFilteredListener(
-              extension_id, event_name, *filter, lazy));
-    }
-
-    args.GetReturnValue().Set(static_cast<int32_t>(id));
-  }
-
-  // Add a filter to |event_name| in |extension_id|, returning true if it
-  // was the first filter for that event in that extension.
-  static bool AddFilter(const std::string& event_name,
-                        const std::string& extension_id,
-                        base::DictionaryValue* filter) {
-    FilteredEventListenerCounts& counts =
-        g_filtered_listener_counts.Get()[extension_id];
-    FilteredEventListenerCounts::iterator it = counts.find(event_name);
-    if (it == counts.end())
-      counts[event_name].reset(new ValueCounter);
-
-    int result = counts[event_name]->Add(*filter);
-    return 1 == result;
-  }
-
-  // Remove a filter from |event_name| in |extension_id|, returning true if it
-  // was the last filter for that event in that extension.
-  static bool RemoveFilter(const std::string& event_name,
-                           const std::string& extension_id,
-                           base::DictionaryValue* filter) {
-    FilteredEventListenerCounts& counts =
-        g_filtered_listener_counts.Get()[extension_id];
-    FilteredEventListenerCounts::iterator it = counts.find(event_name);
-    if (it == counts.end())
-      return false;
-    return 0 == it->second->Remove(*filter);
-  }
-
-  // void DetachFilteredEvent(int id, bool manual)
-  // id     - Id of the event to detach.
-  // manual - false if this is part of the extension unload process where all
-  //          listeners are automatically detached.
-  void DetachFilteredEvent(const v8::FunctionCallbackInfo<v8::Value>& args) {
-    CHECK_EQ(2, args.Length());
-    CHECK(args[0]->IsInt32());
-    CHECK(args[1]->IsBoolean());
-    bool is_manual = args[1]->BooleanValue();
-
-    std::string extension_id = context()->GetExtensionID();
-    if (extension_id.empty())
-      return;
-
-    int matcher_id = args[0]->Int32Value();
-    EventFilter& event_filter = g_event_filter.Get();
-    EventMatcher* event_matcher = event_filter.GetEventMatcher(matcher_id);
-
-    const std::string& event_name = event_filter.GetEventName(matcher_id);
-
-    // Only send IPCs the last time a filter gets removed.
-    if (RemoveFilter(event_name, extension_id, event_matcher->value())) {
-      bool lazy = is_manual && IsLazyBackgroundContext(context());
-      content::RenderThread::Get()->Send(
-          new ExtensionHostMsg_RemoveFilteredListener(
-              extension_id, event_name, *event_matcher->value(), lazy));
-    }
-
-    event_filter.RemoveEventMatcher(matcher_id);
-  }
-
-  void MatchAgainstEventFilter(
-      const v8::FunctionCallbackInfo<v8::Value>& args) {
-    v8::Isolate* isolate = args.GetIsolate();
-    typedef std::set<EventFilter::MatcherID> MatcherIDs;
-    EventFilter& event_filter = g_event_filter.Get();
-    std::string event_name = *v8::String::Utf8Value(args[0]->ToString());
-    EventFilteringInfo info = ParseFromObject(args[1]->ToObject(), isolate);
-    // Only match events routed to this context's RenderView or ones that don't
-    // have a routingId in their filter.
-    MatcherIDs matched_event_filters = event_filter.MatchEvent(
-        event_name, info, context()->GetRenderView()->GetRoutingID());
-    v8::Handle<v8::Array> array(
-        v8::Array::New(isolate, matched_event_filters.size()));
-    int i = 0;
-    for (MatcherIDs::iterator it = matched_event_filters.begin();
-         it != matched_event_filters.end();
-         ++it) {
-      array->Set(v8::Integer::New(isolate, i++),
-                 v8::Integer::New(isolate, *it));
-    }
-    args.GetReturnValue().Set(array);
-  }
-
-  static EventFilteringInfo ParseFromObject(v8::Handle<v8::Object> object,
-                                            v8::Isolate* isolate) {
-    EventFilteringInfo info;
-    v8::Handle<v8::String> url(v8::String::NewFromUtf8(isolate, "url"));
-    if (object->Has(url)) {
-      v8::Handle<v8::Value> url_value(object->Get(url));
-      info.SetURL(GURL(*v8::String::Utf8Value(url_value)));
-    }
-    v8::Handle<v8::String> instance_id(
-        v8::String::NewFromUtf8(isolate, "instanceId"));
-    if (object->Has(instance_id)) {
-      v8::Handle<v8::Value> instance_id_value(object->Get(instance_id));
-      info.SetInstanceID(instance_id_value->IntegerValue());
-    }
-    v8::Handle<v8::String> service_type(
-        v8::String::NewFromUtf8(isolate, "serviceType"));
-    if (object->Has(service_type)) {
-      v8::Handle<v8::Value> service_type_value(object->Get(service_type));
-      info.SetServiceType(*v8::String::Utf8Value(service_type_value));
-    }
-    return info;
-  }
-
- private:
-  static bool IsLazyBackgroundContext(ScriptContext* context) {
-    content::RenderView* render_view = context->GetRenderView();
-    if (!render_view)
-      return false;
-    ExtensionHelper* helper = ExtensionHelper::Get(render_view);
-    const Extension* extension = context->extension();
-    return (extension && BackgroundInfo::HasLazyBackgroundPage(extension) &&
-            helper->view_type() == VIEW_TYPE_EXTENSION_BACKGROUND_PAGE);
-  }
-
-  scoped_ptr<EventMatcher> ParseEventMatcher(
-      base::DictionaryValue* filter_dict) {
-    return scoped_ptr<EventMatcher>(new EventMatcher(
-        scoped_ptr<base::DictionaryValue>(filter_dict->DeepCopy()),
-        context()->GetRenderView()->GetRoutingID()));
-  }
-
-  // Not owned.
-  Dispatcher* dispatcher_;
-};
+bool IsLazyBackgroundPage(content::RenderView* render_view,
+                          const Extension* extension) {
+  if (!render_view)
+    return false;
+  ExtensionHelper* helper = ExtensionHelper::Get(render_view);
+  return (extension && BackgroundInfo::HasLazyBackgroundPage(extension) &&
+          helper->view_type() == VIEW_TYPE_EXTENSION_BACKGROUND_PAGE);
+}
+
+EventFilteringInfo ParseFromObject(v8::Handle<v8::Object> object,
+                                   v8::Isolate* isolate) {
+  EventFilteringInfo info;
+  v8::Handle<v8::String> url(v8::String::NewFromUtf8(isolate, "url"));
+  if (object->Has(url)) {
+    v8::Handle<v8::Value> url_value(object->Get(url));
+    info.SetURL(GURL(*v8::String::Utf8Value(url_value)));
+  }
+  v8::Handle<v8::String> instance_id(
+      v8::String::NewFromUtf8(isolate, "instanceId"));
+  if (object->Has(instance_id)) {
+    v8::Handle<v8::Value> instance_id_value(object->Get(instance_id));
+    info.SetInstanceID(instance_id_value->IntegerValue());
+  }
+  v8::Handle<v8::String> service_type(
+      v8::String::NewFromUtf8(isolate, "serviceType"));
+  if (object->Has(service_type)) {
+    v8::Handle<v8::Value> service_type_value(object->Get(service_type));
+    info.SetServiceType(*v8::String::Utf8Value(service_type_value));
+  }
+  return info;
+}
+
+// Add a filter to |event_name| in |extension_id|, returning true if it
+// was the first filter for that event in that extension.
+bool AddFilter(const std::string& event_name,
+               const std::string& extension_id,
+               base::DictionaryValue* filter) {
+  FilteredEventListenerCounts& counts =
+      g_filtered_listener_counts.Get()[extension_id];
+  FilteredEventListenerCounts::iterator it = counts.find(event_name);
+  if (it == counts.end())
+    counts[event_name].reset(new ValueCounter);
+
+  int result = counts[event_name]->Add(*filter);
+  return 1 == result;
+}
+
+// Remove a filter from |event_name| in |extension_id|, returning true if it
+// was the last filter for that event in that extension.
+bool RemoveFilter(const std::string& event_name,
+                  const std::string& extension_id,
+                  base::DictionaryValue* filter) {
+  FilteredEventListenerCounts& counts =
+      g_filtered_listener_counts.Get()[extension_id];
+  FilteredEventListenerCounts::iterator it = counts.find(event_name);
+  if (it == counts.end())
+    return false;
+  return 0 == it->second->Remove(*filter);
+}
 
 }  // namespace
 
-// static
-ObjectBackedNativeHandler* EventBindings::Create(Dispatcher* dispatcher,
-                                                 ScriptContext* context) {
-  return new ExtensionImpl(dispatcher, context);
+EventBindings::EventBindings(Dispatcher* dispatcher, ScriptContext* context)
+    : ObjectBackedNativeHandler(context), dispatcher_(dispatcher) {
+  RouteFunction(
+      "AttachEvent",
+      base::Bind(&EventBindings::AttachEvent, base::Unretained(this)));
+  RouteFunction(
+      "DetachEvent",
+      base::Bind(&EventBindings::DetachEvent, base::Unretained(this)));
+  RouteFunction(
+      "AttachFilteredEvent",
+      base::Bind(&EventBindings::AttachFilteredEvent, base::Unretained(this)));
+  RouteFunction(
+      "DetachFilteredEvent",
+      base::Bind(&EventBindings::DetachFilteredEvent, base::Unretained(this)));
+  RouteFunction("MatchAgainstEventFilter",
+                base::Bind(&EventBindings::MatchAgainstEventFilter,
+                           base::Unretained(this)));
+}
+
+EventBindings::~EventBindings() {}
+
+// Attach an event name to an object.
+void EventBindings::AttachEvent(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  CHECK_EQ(1, args.Length());
+  CHECK(args[0]->IsString());
+
+  std::string event_name = *v8::String::Utf8Value(args[0]->ToString());
+
+  if (!dispatcher_->CheckContextAccessToExtensionAPI(event_name, context()))
+    return;
+
+  std::string extension_id = context()->GetExtensionID();
+  EventListenerCounts& listener_counts = g_listener_counts.Get()[extension_id];
+  if (++listener_counts[event_name] == 1) {
+    content::RenderThread::Get()->Send(
+        new ExtensionHostMsg_AddListener(extension_id, event_name));
+  }
+
+  // This is called the first time the page has added a listener. Since
+  // the background page is the only lazy page, we know this is the first
+  // time this listener has been registered.
+  if (IsLazyBackgroundPage(context()->GetRenderView(),
+                           context()->extension())) {
+    content::RenderThread::Get()->Send(
+        new ExtensionHostMsg_AddLazyListener(extension_id, event_name));
+  }
+}
+
+void EventBindings::DetachEvent(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  CHECK_EQ(2, args.Length());
+  CHECK(args[0]->IsString());
+  CHECK(args[1]->IsBoolean());
+
+  std::string event_name = *v8::String::Utf8Value(args[0]);
+  bool is_manual = args[1]->BooleanValue();
+
+  std::string extension_id = context()->GetExtensionID();
+  EventListenerCounts& listener_counts = g_listener_counts.Get()[extension_id];
+
+  if (--listener_counts[event_name] == 0) {
+    content::RenderThread::Get()->Send(
+        new ExtensionHostMsg_RemoveListener(extension_id, event_name));
+  }
+
+  // DetachEvent is called when the last listener for the context is
+  // removed. If the context is the background page, and it removes the
+  // last listener manually, then we assume that it is no longer interested
+  // in being awakened for this event.
+  if (is_manual && IsLazyBackgroundPage(context()->GetRenderView(),
+                                        context()->extension())) {
+    content::RenderThread::Get()->Send(
+        new ExtensionHostMsg_RemoveLazyListener(extension_id, event_name));
+  }
+}
+
+// MatcherID AttachFilteredEvent(string event_name, object filter)
+// event_name - Name of the event to attach.
+// filter - Which instances of the named event are we interested in.
+// returns the id assigned to the listener, which will be returned from calls
+// to MatchAgainstEventFilter where this listener matches.
+void EventBindings::AttachFilteredEvent(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  CHECK_EQ(2, args.Length());
+  CHECK(args[0]->IsString());
+  CHECK(args[1]->IsObject());
+
+  std::string event_name = *v8::String::Utf8Value(args[0]);
+
+  // This method throws an exception if it returns false.
+  if (!dispatcher_->CheckContextAccessToExtensionAPI(event_name, context()))
+    return;
+
+  std::string extension_id = context()->GetExtensionID();
+  if (extension_id.empty()) {
+    args.GetReturnValue().Set(static_cast<int32_t>(-1));
+    return;
+  }
+
+  scoped_ptr<base::DictionaryValue> filter;
+  scoped_ptr<content::V8ValueConverter> converter(
+      content::V8ValueConverter::create());
+
+  base::DictionaryValue* filter_dict = NULL;
+  base::Value* filter_value =
+      converter->FromV8Value(args[1]->ToObject(), context()->v8_context());
+  if (!filter_value) {
+    args.GetReturnValue().Set(static_cast<int32_t>(-1));
+    return;
+  }
+  if (!filter_value->GetAsDictionary(&filter_dict)) {
+    delete filter_value;
+    args.GetReturnValue().Set(static_cast<int32_t>(-1));
+    return;
+  }
+
+  filter.reset(filter_dict);
+  EventFilter& event_filter = g_event_filter.Get();
+  int id =
+      event_filter.AddEventMatcher(event_name, ParseEventMatcher(filter.get()));
+
+  // Only send IPCs the first time a filter gets added.
+  if (AddFilter(event_name, extension_id, filter.get())) {
+    bool lazy = IsLazyBackgroundPage(context()->GetRenderView(),
+                                     context()->extension());
+    content::RenderThread::Get()->Send(new ExtensionHostMsg_AddFilteredListener(
+        extension_id, event_name, *filter, lazy));
+  }
+
+  args.GetReturnValue().Set(static_cast<int32_t>(id));
+}
+
+void EventBindings::DetachFilteredEvent(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  CHECK_EQ(2, args.Length());
+  CHECK(args[0]->IsInt32());
+  CHECK(args[1]->IsBoolean());
+  bool is_manual = args[1]->BooleanValue();
+
+  std::string extension_id = context()->GetExtensionID();
+  if (extension_id.empty())
+    return;
+
+  int matcher_id = args[0]->Int32Value();
+  EventFilter& event_filter = g_event_filter.Get();
+  EventMatcher* event_matcher = event_filter.GetEventMatcher(matcher_id);
+
+  const std::string& event_name = event_filter.GetEventName(matcher_id);
+
+  // Only send IPCs the last time a filter gets removed.
+  if (RemoveFilter(event_name, extension_id, event_matcher->value())) {
+    bool lazy = is_manual && IsLazyBackgroundPage(context()->GetRenderView(),
+                                                  context()->extension());
+    content::RenderThread::Get()->Send(
+        new ExtensionHostMsg_RemoveFilteredListener(
+            extension_id, event_name, *event_matcher->value(), lazy));
+  }
+
+  event_filter.RemoveEventMatcher(matcher_id);
+}
+
+void EventBindings::MatchAgainstEventFilter(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  v8::Isolate* isolate = args.GetIsolate();
+  typedef std::set<EventFilter::MatcherID> MatcherIDs;
+  EventFilter& event_filter = g_event_filter.Get();
+  std::string event_name = *v8::String::Utf8Value(args[0]->ToString());
+  EventFilteringInfo info = ParseFromObject(args[1]->ToObject(), isolate);
+  // Only match events routed to this context's RenderView or ones that don't
+  // have a routingId in their filter.
+  MatcherIDs matched_event_filters = event_filter.MatchEvent(
+      event_name, info, context()->GetRenderView()->GetRoutingID());
+  v8::Handle<v8::Array> array(
+      v8::Array::New(isolate, matched_event_filters.size()));
+  int i = 0;
+  for (MatcherIDs::iterator it = matched_event_filters.begin();
+       it != matched_event_filters.end();
+       ++it) {
+    array->Set(v8::Integer::New(isolate, i++), v8::Integer::New(isolate, *it));
+  }
+  args.GetReturnValue().Set(array);
+}
+
+scoped_ptr<EventMatcher> EventBindings::ParseEventMatcher(
+    base::DictionaryValue* filter_dict) {
+  return scoped_ptr<EventMatcher>(new EventMatcher(
+      scoped_ptr<base::DictionaryValue>(filter_dict->DeepCopy()),
+      context()->GetRenderView()->GetRoutingID()));
 }
 
 }  // namespace extensions