Support embedded plugins with MimeHandlerView.

extensions/renderer/guest_view/mime_handler_view_container.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/guest_view/mime_handler_view_container.h"
 
 #include "content/public/renderer/render_frame.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/guest_view/guest_view_constants.h"
+#include "third_party/WebKit/public/web/WebDocument.h"
+#include "third_party/WebKit/public/web/WebLocalFrame.h"
 
 namespace extensions {
 
 MimeHandlerViewContainer::MimeHandlerViewContainer(
     content::RenderFrame* render_frame,
-    const std::string& mime_type)
+    const std::string& mime_type,
+    const GURL& original_url)
     : GuestViewContainer(render_frame),
-      mime_type_(mime_type) {
+      mime_type_(mime_type),
+      original_url_(original_url) {
   DCHECK(!mime_type_.empty());
+  is_embedded_ = !render_frame->GetWebFrame()->document().isPluginDocument();
 }
 
-MimeHandlerViewContainer::~MimeHandlerViewContainer() {}
+MimeHandlerViewContainer::~MimeHandlerViewContainer() {
+  loader_->cancel();

[Fady Samuel, 2014/11/05 09:16:31]

I worry that if we don't get to Ready for whatever reason, then this will crash.
Can we add a NULL check here?

[raymes, 2014/11/06 00:53:34]

Done.

+}
 
 void MimeHandlerViewContainer::DidFinishLoading() {
-  DCHECK_NE(element_instance_id(), guestview::kInstanceIDNone);
-  render_frame()->Send(new ExtensionHostMsg_CreateMimeHandlerViewGuest(
-      routing_id(), html_string_, mime_type_, element_instance_id()));
+  DCHECK(!is_embedded_);
+  CreateMimeHandlerViewGuest();
 }
 
 void MimeHandlerViewContainer::DidReceiveData(const char* data,
                                               int data_length) {
-  std::string value(data, data_length);
-  html_string_ += value;
+  html_string_ += std::string(data, data_length);
+}
+
+void MimeHandlerViewContainer::Ready() {
+  blink::WebFrame* frame = render_frame()->GetWebFrame();
+  blink::WebURLLoaderOptions options;
+  // The embedded plugin is allowed to be cross-origin.
+  options.crossOriginRequestPolicy =
+      blink::WebURLLoaderOptions::CrossOriginRequestPolicyAllow;
+  DCHECK(!loader_);
+  loader_.reset(frame->createAssociatedURLLoader());
+
+  // TODO(raymes): Currently this URL request won't be correctly intercepted as
+  // a stream.
+  loader_->loadAsynchronously(blink::WebURLRequest(original_url_), this);
 }
 
 bool MimeHandlerViewContainer::HandlesMessage(const IPC::Message& message) {
   return message.type() == ExtensionMsg_CreateMimeHandlerViewGuestACK::ID;
 }
 
 bool MimeHandlerViewContainer::OnMessage(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(MimeHandlerViewContainer, message)
     IPC_MESSAGE_HANDLER(ExtensionMsg_CreateMimeHandlerViewGuestACK,
                         OnCreateMimeHandlerViewGuestACK)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
+void MimeHandlerViewContainer::didReceiveData(blink::WebURLLoader* /* unused */,
+                                              const char* data,
+                                              int data_length,
+                                              int /* unused */) {
+  html_string_ += std::string(data, data_length);

[Fady Samuel, 2014/11/05 09:16:31]

didReceiveData, and DidReceiveData. DidFinishLoading and didFinishLoading. A
comment would be really helpful here to explain the difference between these
code paths! Thanks!

[raymes, 2014/11/06 00:53:34]

Done.

+}
+
+void MimeHandlerViewContainer::didFinishLoading(
+    blink::WebURLLoader* /* unused */,
+    double /* unused */,
+    int64_t /* unused */) {
+  DCHECK(is_embedded_);
+  CreateMimeHandlerViewGuest();
+}
+
 void MimeHandlerViewContainer::OnCreateMimeHandlerViewGuestACK(
     int element_instance_id) {
   DCHECK_NE(this->element_instance_id(), guestview::kInstanceIDNone);
   DCHECK_EQ(this->element_instance_id(), element_instance_id);
   render_frame()->AttachGuest(element_instance_id);
 }
 
+void MimeHandlerViewContainer::CreateMimeHandlerViewGuest() {
+  // The loader has completed loading |html_string_| so we can dispose it.
+  loader_.reset();
+
+  // Parse the stream URL to ensure it's valid.
+  GURL stream_url(html_string_);
+
+  DCHECK_NE(element_instance_id(), guestview::kInstanceIDNone);
+  render_frame()->Send(new ExtensionHostMsg_CreateMimeHandlerViewGuest(
+      routing_id(), stream_url.spec(), mime_type_, element_instance_id()));
+}
+
 }  // namespace extensions