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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "content/renderer/java/java_bridge_dispatcher.h"
      6 
      7 #include "content/child/child_process.h"
      8 #include "content/child/npapi/npobject_util.h"  // For CreateNPVariant()
      9 #include "content/common/java_bridge_messages.h"
     10 #include "content/public/renderer/render_thread.h"
     11 #include "content/public/renderer/render_view.h"
     12 #include "content/renderer/java/java_bridge_channel.h"
     13 #include "third_party/WebKit/public/web/WebBindings.h"
     14 #include "third_party/WebKit/public/web/WebDocument.h"
     15 #include "third_party/WebKit/public/web/WebFrame.h"
     16 #include "third_party/WebKit/public/web/WebView.h"
     17 
     18 namespace content {
     19 
     20 JavaBridgeDispatcher::JavaBridgeDispatcher(RenderView* render_view)
     21     : RenderViewObserver(render_view) {
     22 }
     23 
     24 void JavaBridgeDispatcher::EnsureChannelIsSetUp() {
     25   if (channel_.get()) {
     26     return;
     27   }
     28 
     29   IPC::ChannelHandle channel_handle;
     30   Send(new JavaBridgeHostMsg_GetChannelHandle(routing_id(), &channel_handle));
     31 
     32   channel_ = JavaBridgeChannel::GetJavaBridgeChannel(
     33       channel_handle, ChildProcess::current()->io_message_loop_proxy());
     34 }
     35 
     36 JavaBridgeDispatcher::~JavaBridgeDispatcher() {
     37   for (ObjectMap::const_iterator iter = objects_.begin();
     38       iter != objects_.end(); ++iter) {
     39     WebKit::WebBindings::releaseObject(NPVARIANT_TO_OBJECT(iter->second));
     40   }
     41 }
     42 
     43 bool JavaBridgeDispatcher::OnMessageReceived(const IPC::Message& msg) {
     44   bool handled = true;
     45   IPC_BEGIN_MESSAGE_MAP(JavaBridgeDispatcher, msg)
     46     IPC_MESSAGE_HANDLER(JavaBridgeMsg_AddNamedObject, OnAddNamedObject)
     47     IPC_MESSAGE_HANDLER(JavaBridgeMsg_RemoveNamedObject,
     48                         OnRemoveNamedObject)
     49     IPC_MESSAGE_UNHANDLED(handled = false)
     50   IPC_END_MESSAGE_MAP()
     51   return handled;
     52 }
     53 
     54 void JavaBridgeDispatcher::DidClearWindowObject(WebKit::WebFrame* web_frame) {
     55   // Note that we have to (re)bind all objects, as they will have been unbound
     56   // when the window object was cleared.
     57   for (ObjectMap::const_iterator iter = objects_.begin();
     58       iter != objects_.end(); ++iter) {
     59     // This refs the NPObject. This reference is dropped when either the window
     60     // object is later cleared, or the object is GC'ed. So the object may be
     61     // deleted at any time after OnRemoveNamedObject() is called.
     62     web_frame->bindToWindowObject(iter->first,
     63         NPVARIANT_TO_OBJECT(iter->second));
     64   }
     65 }
     66 
     67 void JavaBridgeDispatcher::OnAddNamedObject(
     68     const string16& name,
     69     const NPVariant_Param& variant_param) {
     70   DCHECK_EQ(variant_param.type, NPVARIANT_PARAM_SENDER_OBJECT_ROUTING_ID);
     71 
     72   EnsureChannelIsSetUp();
     73   if (!channel_.get()) {
     74     // It's possible for |channel_| to be NULL if the RenderView is going away.
     75     return;
     76   }
     77 
     78   // This creates an NPObject, wrapped as an NPVariant. Pass 0 for the for
     79   // containing window, as this is only used by plugins to pump the window
     80   // message queue when a method on a renderer-side object causes a dialog to
     81   // be displayed, and the Java Bridge does not need this functionality. The
     82   // page URL is also not required.
     83   NPVariant variant;
     84   bool created =
     85       CreateNPVariant(variant_param, channel_.get(), &variant, 0, GURL());
     86   DCHECK(created);
     87   DCHECK_EQ(variant.type, NPVariantType_Object);
     88 
     89   // The NPObject is created with a ref count of one, which we remove when
     90   // OnRemoveNamedObject() is called for that object.
     91   ObjectMap::iterator iter = objects_.find(name);
     92   if (iter != objects_.end()) {
     93     WebKit::WebBindings::releaseObject(NPVARIANT_TO_OBJECT(iter->second));
     94   }
     95   objects_[name] = variant;
     96 }
     97 
     98 void JavaBridgeDispatcher::OnRemoveNamedObject(const string16& name) {
     99   if (!channel_.get()) {
    100     DCHECK(objects_.empty());
    101     return;
    102   }
    103 
    104   // Removing an object does not unbind it from JavaScript until the window
    105   // object is next cleared. Note that the browser checks that the named object
    106   // is present.
    107   ObjectMap::iterator iter = objects_.find(name);
    108   DCHECK(iter != objects_.end());
    109   WebKit::WebBindings::releaseObject(NPVARIANT_TO_OBJECT(iter->second));
    110   objects_.erase(iter);
    111 }
    112 
    113 }  // namespace content
    114