Move EventBindings to //extensions

extensions/renderer/event_bindings.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/renderer/extensions/event_bindings.h"
+#include "extensions/renderer/event_bindings.h"
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/message_loop/message_loop.h"
-#include "chrome/common/extensions/value_counter.h"
-#include "chrome/common/url_constants.h"
-#include "chrome/renderer/extensions/chrome_v8_context.h"
-#include "chrome/renderer/extensions/chrome_v8_context_set.h"
-#include "chrome/renderer/extensions/chrome_v8_extension.h"
 #include "chrome/renderer/extensions/dispatcher.h"
 #include "chrome/renderer/extensions/extension_helper.h"
-#include "chrome/renderer/extensions/user_script_slave.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/public/renderer/render_view.h"
 #include "content/public/renderer/v8_value_converter.h"
 #include "extensions/common/event_filter.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/manifest_handlers/background_info.h"
-#include "extensions/common/view_type.h"
-#include "grit/renderer_resources.h"
-#include "third_party/WebKit/public/platform/WebURL.h"
-#include "third_party/WebKit/public/platform/WebURLRequest.h"
-#include "third_party/WebKit/public/web/WebDocument.h"
-#include "third_party/WebKit/public/web/WebFrame.h"
-#include "third_party/WebKit/public/web/WebView.h"
+#include "extensions/common/value_counter.h"
+#include "extensions/renderer/object_backed_native_handler.h"
 #include "url/gurl.h"
 #include "v8/include/v8.h"
 
-using blink::WebFrame;
-using blink::WebURL;
-using content::RenderThread;
-
 namespace extensions {
 
 namespace {
 
 // A map of event names to the number of contexts listening to that event.
 // We notify the browser about event listeners when we transition between 0
 // and 1.
 typedef std::map<std::string, int> EventListenerCounts;
 
 // A map of extension IDs to listener counts for that extension.
 base::LazyInstance<std::map<std::string, EventListenerCounts> >
     g_listener_counts = LAZY_INSTANCE_INITIALIZER;
 
 // A map of event names to a (filter -> count) map. The map is used to keep
 // track of which filters are in effect for which events.
 // We notify the browser about filtered event listeners when we transition
 // 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 ChromeV8Extension {
+class ExtensionImpl : public ObjectBackedNativeHandler {
  public:
-  explicit ExtensionImpl(Dispatcher* dispatcher, ChromeV8Context* context)
-      : ChromeV8Extension(dispatcher, context) {
-    RouteFunction("AttachEvent",
+  explicit ExtensionImpl(Dispatcher* dispatcher, ScriptContext* context)
+      : ObjectBackedNativeHandler(context), dispatcher_(dispatcher) {
+    RouteFunction(
+        "AttachEvent",
         base::Bind(&ExtensionImpl::AttachEvent, base::Unretained(this)));
-    RouteFunction("DetachEvent",
+    RouteFunction(
+        "DetachEvent",
         base::Bind(&ExtensionImpl::DetachEvent, base::Unretained(this)));
     RouteFunction("AttachFilteredEvent",
-        base::Bind(&ExtensionImpl::AttachFilteredEvent,
-                   base::Unretained(this)));
+                  base::Bind(&ExtensionImpl::AttachFilteredEvent,
+                             base::Unretained(this)));
     RouteFunction("DetachFilteredEvent",
-        base::Bind(&ExtensionImpl::DetachFilteredEvent,
-                   base::Unretained(this)));
+                  base::Bind(&ExtensionImpl::DetachFilteredEvent,
+                             base::Unretained(this)));
     RouteFunction("MatchAgainstEventFilter",
-        base::Bind(&ExtensionImpl::MatchAgainstEventFilter,
-                   base::Unretained(this)));
+                  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 (IsLazyBackgroundPage(GetRenderView(), context()->extension())) {
+    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 && IsLazyBackgroundPage(GetRenderView(),
-                                          context()->extension())) {
+    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.
@@ skipping 26 matching lines @@
       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()));
+    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(GetRenderView(), context()->extension());
+      bool lazy = IsLazyBackgroundContext(context());
       content::RenderThread::Get()->Send(
-          new ExtensionHostMsg_AddFilteredListener(extension_id, event_name,
-                                                   *filter, lazy));
+          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) {
@@ skipping 29 matching lines @@
     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);
+    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(GetRenderView(),
-                                                    context()->extension());
+      bool lazy = is_manual && IsLazyBackgroundContext(context());
       content::RenderThread::Get()->Send(
-          new ExtensionHostMsg_RemoveFilteredListener(extension_id, event_name,
-                                                      *event_matcher->value(),
-                                                      lazy));
+          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);
+    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) {
+         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"));
@@ skipping 10 matching lines @@
     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 IsLazyBackgroundPage(content::RenderView* render_view,
-                                   const Extension* extension) {
+  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()));
+        context()->GetRenderView()->GetRoutingID()));
   }
+
+  // Not owned.
+  Dispatcher* dispatcher_;
 };
 
 }  // namespace
 
 // static
-ChromeV8Extension* EventBindings::Create(Dispatcher* dispatcher,
-                                         ChromeV8Context* context) {
+ObjectBackedNativeHandler* EventBindings::Create(Dispatcher* dispatcher,
+                                                 ScriptContext* context) {
   return new ExtensionImpl(dispatcher, context);
 }
 
 }  // namespace extensions