Implemented Browser Plugin (NOT FOR REVIEW)

content/renderer/plugins/browser_plugin_placeholder.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 "content/renderer/plugins/browser_plugin_placeholder.h"
+
+#include "base/atomic_sequence_num.h"
+#include "base/id_map.h"
+#include "base/lazy_instance.h"
+#include "base/process.h"
+#include "base/string_number_conversions.h"
+#include "base/string_piece.h"
+#include "base/string_util.h"
+#include "base/values.h"
+#include "content/common/view_messages.h"
+#include "content/public/renderer/render_view.h"
+#include "ipc/ipc_channel_handle.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPlugin.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPluginContainer.h"
+#include "webkit/plugins/webview_plugin.h"
+
+static base::AtomicSequenceNumber g_next_id(base::LINKER_INITIALIZED);
+// the global list of all renderer processes
+base::LazyInstance<IDMap<BrowserPluginPlaceholder> >::Leaky
+    g_all_placeholders = LAZY_INSTANCE_INITIALIZER;
+
+
+using webkit::WebViewPlugin;
+using WebKit::WebPlugin;
+using WebKit::WebPluginContainer;
+
+const char* const kPluginPlaceholderDataURL =
+    "about:blank";
+
+// static
+webkit::WebViewPlugin* BrowserPluginPlaceholder::Create(
+    content::RenderView* render_view,
+    WebKit::WebFrame* frame,
+    const WebKit::WebPluginParams& params) {
+  // TODO(fsamuel): Need a better loading screen at some point. Maybe this can
+  // be a part of the <browser> API?
+  // |browser_plugin| will destroy itself when its WebViewPlugin is going away.
+  BrowserPluginPlaceholder* browser_plugin = new BrowserPluginPlaceholder(
+      render_view, frame, params, "");
+  return browser_plugin->plugin();
+}
+
+// static
+BrowserPluginPlaceholder* BrowserPluginPlaceholder::FromID(int id) {
+  return g_all_placeholders.Get().Lookup(id);
+}
+
+BrowserPluginPlaceholder::BrowserPluginPlaceholder(
+    content::RenderView* render_view,
+    WebKit::WebFrame* frame,
+    const WebKit::WebPluginParams& params,
+    const std::string& html_data)
+    : render_view_(render_view),
+      plugin_params_(params),
+      plugin_(webkit::WebViewPlugin::Create(
+              this, render_view->GetWebkitPreferences(), html_data,
+                        GURL(kPluginPlaceholderDataURL))),
+      width_(0),
+      height_(0) {
+  id_ = g_next_id.GetNext();
+  RegisterPlaceholder(GetID(), this);
+
+  // By default we navigate to google.com
+  GetPluginParameters(0, 0, "http://www.google.com/");
+
+  render_view->Send(new ViewHostMsg_OpenChannelToBrowserPlugin(
+      render_view->GetRoutingID(), GetID(), src_));
+}
+
+BrowserPluginPlaceholder::~BrowserPluginPlaceholder() {
+  UnregisterPlaceholder(GetID());
+}
+
+void BrowserPluginPlaceholder::RegisterPlaceholder(
+    int id,
+    BrowserPluginPlaceholder* placeholder) {
+  g_all_placeholders.Get().AddWithID(placeholder, id);
+}
+
+void BrowserPluginPlaceholder::UnregisterPlaceholder(int id) {
+  if (g_all_placeholders.Get().Lookup(id))
+    g_all_placeholders.Get().Remove(id);
+}
+
+const WebKit::WebPluginParams& BrowserPluginPlaceholder::plugin_params() const {
+    return plugin_params_;
+}
+
+void BrowserPluginPlaceholder::GetPluginParameters(
+    int default_width, int default_height,
+    const std::string& default_src) {
+
+  // Get the plugin parameters from the attributes vector
+  for (unsigned i = 0; i < plugin_params_.attributeNames.size(); ++i) {
+    std::string attributeName = plugin_params_.attributeNames[i].utf8();
+    if (LowerCaseEqualsASCII(attributeName, "width")) {
+      std::string attributeValue = plugin_params_.attributeValues[i].utf8();
+      CHECK(base::StringToInt(attributeValue, &width_));
+    } else if (LowerCaseEqualsASCII(attributeName, "height")) {
+      std::string attributeValue = plugin_params_.attributeValues[i].utf8();
+      CHECK(base::StringToInt(attributeValue, &height_));
+    } else if (LowerCaseEqualsASCII(attributeName, "src")) {
+      src_ = plugin_params_.attributeValues[i].utf8();
+    }
+  }
+  // If we didn't find the attributes set or they're not sensible,
+  // we reset our attributes to the default.
+  if (!width_)
+    width_ = default_width;
+
+  if (!height_)
+    height_ = default_height;
+
+  if (src_.empty())
+    src_ = default_src;
+}
+
+void BrowserPluginPlaceholder::GuestReady(
+    base::ProcessHandle process_handle,
+    const IPC::ChannelHandle& channel_handle) {
+  WebKit::WebPlugin* new_plugin =
+      render_view()->CreateBrowserPlugin(process_handle,
+                                         channel_handle,
+                                         plugin_params());
+  LoadGuest(new_plugin);
+}
+
+void BrowserPluginPlaceholder::LoadGuest(WebKit::WebPlugin* new_plugin) {
+  CHECK(plugin_);
+  WebKit::WebPluginContainer* container = plugin_->container();
+  if (!new_plugin || !new_plugin->initialize(container))
+    return;
+  plugin_->RestoreTitleText();
+  container->setPlugin(new_plugin);
+  container->invalidate();
+  container->reportGeometry();
+  plugin_->ReplayReceivedData(new_plugin);
+  plugin_->destroy();
+}
+
+void BrowserPluginPlaceholder::WillDestroyPlugin() {
+  delete this;
+}