Initial implementation of the <extensionoptions> GuestView tag

chrome/browser/guest_view/extension_options/extension_options_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/extension_options/extension_options_guest.h"
+
+#include "chrome/browser/extensions/chrome_extension_web_contents_observer.h"
+#include "chrome/browser/guest_view/extension_options/extension_options_constants.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/common/extensions/manifest_url_handler.h"
+#include "content/public/browser/render_process_host.h"
+#include "content/public/browser/site_instance.h"
+#include "content/public/browser/web_contents.h"
+#include "extensions/browser/extension_function_dispatcher.h"
+#include "extensions/browser/extension_registry.h"
+#include "extensions/common/extension.h"
+#include "extensions/common/extension_messages.h"
+#include "extensions/common/permissions/permissions_data.h"
+#include "ipc/ipc_message_macros.h"
+
+using content::WebContents;
+
+// static
+const char ExtensionOptionsGuest::Type[] = "extensionoptions";
+
+ExtensionOptionsGuest::ExtensionOptionsGuest(
+    content::BrowserContext* browser_context,
+    int guest_instance_id)
+    : GuestView<ExtensionOptionsGuest>(browser_context, guest_instance_id) {
+}
+
+ExtensionOptionsGuest::~ExtensionOptionsGuest() {
+}
+
+bool ExtensionOptionsGuest::CanEmbedderUseGuestView(
+    const std::string& embedder_extension_id) {
+  const extensions::Extension* embedder_extension =
+      extensions::ExtensionRegistry::Get(browser_context())
+          ->enabled_extensions()
+          .GetByID(embedder_extension_id);
+  if (embedder_extension) {

[Fady Samuel, 2014/07/21 12:48:56]

nit: you can avoid a block as follows (I feel this is slightly more readable):

if (!embedder_extension)
  return false;

return embedder_extension->permissions_data()->HasAPIPermission(
    extensions::APIPermission::kEmbeddedExtensionOptions);

[ericzeng, 2014/07/21 17:52:39]

Done.

+    return embedder_extension->permissions_data()->HasAPIPermission(
+        extensions::APIPermission::kEmbeddedExtensionOptions);
+  }
+  return false;
+}
+
+void ExtensionOptionsGuest::CreateWebContents(
+    const std::string& embedder_extension_id,
+    int embedder_render_process_id,
+    const base::DictionaryValue& create_params,
+    const WebContentsCreatedCallback& callback) {
+  content::BrowserContext* browser_context =

[Fady Samuel, 2014/07/21 12:48:56]

Hmm, is this necessary? A GuestView should know about its BrowserContext at this
point.

Try browser_context() accessor.

[ericzeng, 2014/07/21 17:52:39]

Done.

+      content::RenderProcessHost::FromID(embedder_render_process_id)
+          ->GetBrowserContext();
+
+  // Get the extension's base URL.
+  std::string extension_id;
+  create_params.GetString(extensionoptions::kExtensionId, &extension_id);
+  if (extension_id.empty()) {
+    callback.Run(NULL);
+    return;
+  }
+  DCHECK(extensions::Extension::IdIsValid(extension_id));
+
+  GURL extension_url =
+      extensions::Extension::GetBaseURLFromExtensionId(extension_id);
+  if (!extension_url.is_valid()) {
+    callback.Run(NULL);
+    return;
+  }
+
+  // Get the options page URL for later use.
+  extensions::ExtensionRegistry* registry =
+      extensions::ExtensionRegistry::Get(browser_context);
+  const extensions::Extension* extension =
+      registry->enabled_extensions().GetByID(extension_id);
+  options_page_ = extensions::ManifestURL::GetOptionsPage(extension);
+  if (!options_page_.is_valid()) {
+    callback.Run(NULL);
+    return;
+  }
+
+  // Create a Webcontents using the extension URL. The options page's

[Fady Samuel, 2014/07/21 12:48:56]

s/Webcontents/WebContents

[ericzeng, 2014/07/21 17:52:39]

Done.

+  // WebContents should live in the same process as its parent extension's
+  // WebContents, so we can use |extension_url| for creating the SiteInstance.
+  content::SiteInstance* options_site_instance =
+      content::SiteInstance::CreateForURL(browser_context, extension_url);
+  WebContents::CreateParams params(browser_context, options_site_instance);
+  params.guest_delegate = this;
+  callback.Run(WebContents::Create(params));
+}
+
+void ExtensionOptionsGuest::DidAttachToEmbedder() {
+  guest_web_contents()->GetController().LoadURL(options_page_,
+                                                content::Referrer(),
+                                                content::PAGE_TRANSITION_LINK,
+                                                std::string());
+}
+
+void ExtensionOptionsGuest::DidInitialize() {
+  extension_function_dispatcher_.reset(
+      new extensions::ExtensionFunctionDispatcher(browser_context(), this));
+  extensions::ChromeExtensionWebContentsObserver::CreateForWebContents(
+      guest_web_contents());
+}
+
+content::WebContents* ExtensionOptionsGuest::GetAssociatedWebContents() const {
+  return guest_web_contents();
+}
+
+bool ExtensionOptionsGuest::OnMessageReceived(const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(ExtensionOptionsGuest, message)
+    IPC_MESSAGE_HANDLER(ExtensionHostMsg_Request, OnRequest)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void ExtensionOptionsGuest::OnRequest(
+    const ExtensionHostMsg_Request_Params& params) {
+  extension_function_dispatcher_->Dispatch(
+      params, guest_web_contents()->GetRenderViewHost());
+}