Implement <appview>

chrome/browser/guest_view/app_view/app_view_guest.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 "chrome/browser/guest_view/app_view/app_view_guest.h"
 
-// static
+#include "chrome/browser/extensions/chrome_extension_web_contents_observer.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/guest_view/app_view/app_view_constants.h"
+#include "chrome/browser/guest_view/guest_view_manager.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/renderer_context_menu/context_menu_delegate.h"
+#include "chrome/browser/renderer_context_menu/render_view_context_menu.h"
+#include "content/public/browser/render_view_host.h"
+#include "content/public/common/renderer_preferences.h"
+#include "extensions/browser/api/app_runtime/app_runtime_api.h"
+#include "extensions/browser/event_router.h"
+#include "extensions/browser/extension_host.h"
+#include "extensions/browser/extension_system.h"
+#include "extensions/browser/lazy_background_task_queue.h"
+#include "extensions/browser/view_type_utils.h"
+#include "extensions/common/api/app_runtime.h"
+#include "extensions/common/extension_messages.h"
+#include "ipc/ipc_message_macros.h"
+
+namespace app_runtime = extensions::core_api::app_runtime;
+
+using content::RenderFrameHost;
+using content::WebContents;
+using extensions::ExtensionHost;
+
+namespace {
+
+struct ResponseInfo {
+  scoped_refptr<const extensions::Extension> guest_extension;
+  base::WeakPtr<AppViewGuest> app_view_guest;
+  GuestViewBase::WebContentsCreatedCallback callback;
+
+  ResponseInfo(const extensions::Extension* guest_extension,
+               const base::WeakPtr<AppViewGuest>& app_view_guest,
+               const GuestViewBase::WebContentsCreatedCallback& callback)
+      : guest_extension(guest_extension),
+        app_view_guest(app_view_guest),
+        callback(callback) {}
+
+  ~ResponseInfo() {}
+};
+
+typedef std::map<int, linked_ptr<ResponseInfo> > PendingResponseMap;
+static base::LazyInstance<PendingResponseMap> pending_response_map =
+    LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+// static.
 const char AppViewGuest::Type[] = "appview";
 
+// static.
+bool AppViewGuest::CompletePendingRequest(
+    const GURL& url,
+    int guest_instance_id,
+    content::BrowserContext* browser_context,
+    const std::string& guest_extension_id) {
+  PendingResponseMap* response_map = pending_response_map.Pointer();
+  PendingResponseMap::iterator it = response_map->find(guest_instance_id);
+  if (it == response_map->end()) {
+    // An app is sending invalid responses. We should probably kill it.

[lazyboy, 2014/07/08 18:24:33]

Why "probably" kill?
If we're not sure about killing the process, then this should be a TODO instead?

[Fady Samuel, 2014/07/08 20:23:46]

Done.

+    return false;
+  }
+
+  linked_ptr<ResponseInfo> response_info = it->second;
+  if (!response_info->app_view_guest ||
+      (response_info->guest_extension->id() != guest_extension_id)) {
+    // An app is trying to respond to an <appview> that didn't initiate
+    // communication with it. We should kill the app here.
+    return false;
+  }
+
+  response_info->app_view_guest->
+      CompleteCreateWebContents(url,
+                                response_info->guest_extension,
+                                response_info->callback);
+
+  response_map->erase(guest_instance_id);
+  return true;
+}
+
 AppViewGuest::AppViewGuest(content::BrowserContext* browser_context,
                            int guest_instance_id)
-    : GuestView<AppViewGuest>(browser_context, guest_instance_id) {
+    : GuestView<AppViewGuest>(browser_context, guest_instance_id),
+      weak_ptr_factory_(this) {
 }
 
 AppViewGuest::~AppViewGuest() {
 }
 
+extensions::WindowController* AppViewGuest::GetExtensionWindowController()
+    const {
+  return NULL;
+}
+
+content::WebContents* AppViewGuest::GetAssociatedWebContents() const {
+  return guest_web_contents();
+}
+
+bool AppViewGuest::OnMessageReceived(const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(AppViewGuest, message)
+    IPC_MESSAGE_HANDLER(ExtensionHostMsg_Request, OnRequest)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+bool AppViewGuest::HandleContextMenu(const content::ContextMenuParams& params) {
+  ContextMenuDelegate* menu_delegate =
+      ContextMenuDelegate::FromWebContents(guest_web_contents());
+  DCHECK(menu_delegate);
+
+  scoped_ptr<RenderViewContextMenu> menu =
+      menu_delegate->BuildMenu(guest_web_contents(), params);
+  menu_delegate->ShowMenu(menu.Pass());
+  return true;
+}
+
 void AppViewGuest::CreateWebContents(
     const std::string& embedder_extension_id,
     int embedder_render_process_id,
     const base::DictionaryValue& create_params,
     const WebContentsCreatedCallback& callback) {
-  // TODO(fsamuel): Create a WebContents with the appropriate SiteInstance here.
-  // After the WebContents has been created, call the |callback|.
-  // callback.Run(new_web_contents);
+  std::string app_id;
+  if (!create_params.GetString(appview::kAppID, &app_id)) {
+    callback.Run(NULL);
+    return;
+  }
+
+  Profile* profile = Profile::FromBrowserContext(browser_context());
+  ExtensionService* service =
+      extensions::ExtensionSystem::Get(profile)->extension_service();
+  const extensions::Extension* guest_extension =
+      service->GetExtensionById(app_id, false);
+  const extensions::Extension* embedder_extension =
+      service->GetExtensionById(embedder_extension_id, false);
+
+  if (!guest_extension || !guest_extension->is_platform_app() ||
+      !embedder_extension | !embedder_extension->is_platform_app()) {
+    callback.Run(NULL);
+    return;
+  }
+
+  pending_response_map.Get().insert(
+      std::make_pair(GetGuestInstanceID(),
+                     new ResponseInfo(guest_extension,
+                                      weak_ptr_factory_.GetWeakPtr(),
+                                      callback)));
+
+  extensions::LazyBackgroundTaskQueue* queue =
+      extensions::ExtensionSystem::Get(profile)->lazy_background_task_queue();
+  if (queue->ShouldEnqueueTask(profile, guest_extension)) {
+    queue->AddPendingTask(profile,
+                          guest_extension->id(),
+                          base::Bind(&AppViewGuest::LaunchAppAndFireEvent,
+                                     weak_ptr_factory_.GetWeakPtr(),
+                                     callback));
+    return;
+  }
+
+  extensions::ProcessManager* process_manager =
+      extensions::ExtensionSystem::Get(profile)->process_manager();
+  ExtensionHost* host =
+      process_manager->GetBackgroundHostForExtension(guest_extension->id());
+  DCHECK(host);
+  LaunchAppAndFireEvent(callback, host);
 }
 
 void AppViewGuest::DidAttachToEmbedder() {
   // This is called after the guest process has been attached to a host
   // element. This means that the host element knows how to route input
   // events to the guest, and the guest knows how to get frames to the
   // embedder.
-  // TODO(fsamuel): Perform the initial navigation here.
+  guest_web_contents()->GetController().LoadURL(
+      url_, content::Referrer(), content::PAGE_TRANSITION_LINK, std::string());
 }
+
+void AppViewGuest::DidInitialize() {
+  extension_function_dispatcher_.reset(
+      new extensions::ExtensionFunctionDispatcher(browser_context(), this));
+}
+
+void AppViewGuest::OnRequest(const ExtensionHostMsg_Request_Params& params) {
+  extension_function_dispatcher_->Dispatch(
+      params, guest_web_contents()->GetRenderViewHost());
+}
+
+void AppViewGuest::CompleteCreateWebContents(
+    const GURL& url,
+    const extensions::Extension* guest_extension,
+    const WebContentsCreatedCallback& callback) {
+  if (!url.is_valid()) {
+    callback.Run(NULL);
+    return;
+  }
+  url_ = url;
+  guest_extension_id_ = guest_extension->id();
+
+  WebContents::CreateParams params(
+      browser_context(),
+      content::SiteInstance::CreateForURL(browser_context(),
+                                          guest_extension->url()));
+  params.guest_delegate = this;
+  callback.Run(WebContents::Create(params));
+}
+
+void AppViewGuest::LaunchAppAndFireEvent(
+    const WebContentsCreatedCallback& callback,
+    ExtensionHost* extension_host) {
+  Profile* profile = Profile::FromBrowserContext(browser_context());
+  extensions::ExtensionSystem* system =
+      extensions::ExtensionSystem::Get(browser_context());
+  bool has_event_listener = system->event_router()->ExtensionHasEventListener(
+      extension_host->extension()->id(),
+      app_runtime::OnAppEmbeddingRequest::kEventName);
+  if (!has_event_listener) {
+    callback.Run(NULL);
+    return;
+  }
+
+  scoped_ptr<base::DictionaryValue> embed_app_data(new base::DictionaryValue());
+  embed_app_data->SetInteger(appview::kGuestInstanceID, GetGuestInstanceID());
+  embed_app_data->SetString(appview::kEmbedderExtensionID,
+                            embedder_extension_id());
+  extensions::AppRuntimeEventRouter::DispatchOnAppEmbeddingRequestEvent(
+      profile, embed_app_data.Pass(), extension_host->extension());
+}
+