Move renderer plugin code into a new component (re-land)

components/plugins/renderer/mobile_youtube_plugin.cc

+// Copyright 2013 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 "components/plugins/renderer/mobile_youtube_plugin.h"
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/strings/string_piece.h"
+#include "base/strings/string_util.h"
+#include "base/values.h"
+#include "content/public/common/content_constants.h"
+#include "content/public/renderer/render_view.h"
+#include "third_party/WebKit/public/web/WebFrame.h"
+#include "ui/base/webui/jstemplate_builder.h"
+
+using WebKit::WebFrame;
+using WebKit::WebPlugin;
+using WebKit::WebURLRequest;
+
+const char* const kSlashVSlash = "/v/";
+const char* const kSlashESlash = "/e/";
+
+namespace {
+
+std::string GetYoutubeVideoId(const WebKit::WebPluginParams& params) {
+  GURL url(params.url);
+  std::string video_id = url.path().substr(strlen(kSlashVSlash));
+
+  // Extract just the video id
+  size_t video_id_end = video_id.find('&');
+  if (video_id_end != std::string::npos)
+    video_id = video_id.substr(0, video_id_end);
+  return video_id;
+}
+
+std::string HtmlData(const WebKit::WebPluginParams& params,
+                     base::StringPiece template_html) {
+  base::DictionaryValue values;
+  values.SetString("video_id", GetYoutubeVideoId(params));
+  return webui::GetI18nTemplateHtml(template_html, &values);
+}
+
+bool IsValidYouTubeVideo(const std::string& path) {
+  unsigned len = strlen(kSlashVSlash);
+
+  // check for more than just /v/ or /e/.
+  if (path.length() <= len)
+    return false;
+
+  std::string str = StringToLowerASCII(path);
+  // Youtube flash url can start with /v/ or /e/.
+  if (strncmp(str.data(), kSlashVSlash, len) != 0 &&
+      strncmp(str.data(), kSlashESlash, len) != 0)
+    return false;
+
+  // Start after /v/
+  for (unsigned i = len; i < path.length(); i++) {
+    char c = str[i];
+    if (isalpha(c) || isdigit(c) || c == '_' || c == '-')
+      continue;
+    // The url can have more parameters such as &hl=en after the video id.
+    // Once we start seeing extra parameters we can return true.
+    return c == '&' && i > len;
+  }
+  return true;
+}
+
+}  // namespace
+
+namespace plugins {
+
+MobileYouTubePlugin::MobileYouTubePlugin(content::RenderView* render_view,
+                                         WebKit::WebFrame* frame,
+                                         const WebKit::WebPluginParams& params,
+                                         base::StringPiece& template_html,
+                                         GURL placeholderDataUrl)
+    : PluginPlaceholder(render_view,
+                        frame,
+                        params,
+                        HtmlData(params, template_html),
+                        placeholderDataUrl) {}
+
+// static
+bool MobileYouTubePlugin::IsYouTubeURL(const GURL& url,
+                                       const std::string& mime_type) {
+  std::string host = url.host();
+  bool is_youtube = EndsWith(host, "youtube.com", true) ||
+                    EndsWith(host, "youtube-nocookie.com", true);
+
+  return is_youtube && IsValidYouTubeVideo(url.path()) &&
+         LowerCaseEqualsASCII(mime_type, content::kFlashPluginSwfMimeType);
+}
+
+void MobileYouTubePlugin::OpenYoutubeUrlCallback(
+    const webkit_glue::CppArgumentList& args,
+    webkit_glue::CppVariant* result) {
+  std::string youtube("vnd.youtube:");
+  GURL url(youtube.append(GetYoutubeVideoId(GetPluginParams())));
+  WebURLRequest request;
+  request.initialize();
+  request.setURL(url);
+  render_view()->LoadURLExternally(
+      GetFrame(), request, WebKit::WebNavigationPolicyNewForegroundTab);
+}
+void MobileYouTubePlugin::BindWebFrame(WebFrame* frame) {
+  PluginPlaceholder::BindWebFrame(frame);
+  BindCallback("openYoutubeURL",
+               base::Bind(&MobileYouTubePlugin::OpenYoutubeUrlCallback,
+                          base::Unretained(this)));
+}
+
+}  // namespace plugins