1// Copyright 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "components/plugins/renderer/mobile_youtube_plugin.h"
6
7#include "base/bind.h"
8#include "base/bind_helpers.h"
9#include "base/strings/string_piece.h"
10#include "base/strings/string_util.h"
11#include "base/values.h"
12#include "content/public/common/content_constants.h"
13#include "content/public/renderer/render_frame.h"
14#include "gin/handle.h"
15#include "gin/object_template_builder.h"
16#include "third_party/WebKit/public/web/WebFrame.h"
17#include "third_party/WebKit/public/web/WebKit.h"
18#include "ui/base/webui/jstemplate_builder.h"
19
20using blink::WebFrame;
21using blink::WebPlugin;
22using blink::WebURLRequest;
23
24const char* const kSlashVSlash = "/v/";
25const char* const kSlashESlash = "/e/";
26
27namespace {
28
29std::string GetYoutubeVideoId(const blink::WebPluginParams& params) {
30  GURL url(params.url);
31  std::string video_id = url.path().substr(strlen(kSlashVSlash));
32
33  // Extract just the video id
34  size_t video_id_end = video_id.find('&');
35  if (video_id_end != std::string::npos)
36    video_id = video_id.substr(0, video_id_end);
37  return video_id;
38}
39
40std::string HtmlData(const blink::WebPluginParams& params,
41                     base::StringPiece template_html) {
42  base::DictionaryValue values;
43  values.SetString("video_id", GetYoutubeVideoId(params));
44  return webui::GetI18nTemplateHtml(template_html, &values);
45}
46
47bool IsValidYouTubeVideo(const std::string& path) {
48  unsigned len = strlen(kSlashVSlash);
49
50  // check for more than just /v/ or /e/.
51  if (path.length() <= len)
52    return false;
53
54  std::string str = StringToLowerASCII(path);
55  // Youtube flash url can start with /v/ or /e/.
56  if (strncmp(str.data(), kSlashVSlash, len) != 0 &&
57      strncmp(str.data(), kSlashESlash, len) != 0)
58    return false;
59
60  // Start after /v/
61  for (unsigned i = len; i < path.length(); i++) {
62    char c = str[i];
63    if (isalpha(c) || isdigit(c) || c == '_' || c == '-')
64      continue;
65    // The url can have more parameters such as &hl=en after the video id.
66    // Once we start seeing extra parameters we can return true.
67    return c == '&' && i > len;
68  }
69  return true;
70}
71
72}  // namespace
73
74namespace plugins {
75
76MobileYouTubePlugin::MobileYouTubePlugin(content::RenderFrame* render_frame,
77                                         blink::WebLocalFrame* frame,
78                                         const blink::WebPluginParams& params,
79                                         base::StringPiece& template_html,
80                                         GURL placeholderDataUrl)
81    : PluginPlaceholder(render_frame,
82                        frame,
83                        params,
84                        HtmlData(params, template_html),
85                        placeholderDataUrl) {}
86
87MobileYouTubePlugin::~MobileYouTubePlugin() {}
88
89// static
90bool MobileYouTubePlugin::IsYouTubeURL(const GURL& url,
91                                       const std::string& mime_type) {
92  std::string host = url.host();
93  bool is_youtube = EndsWith(host, "youtube.com", true) ||
94                    EndsWith(host, "youtube-nocookie.com", true);
95
96  return is_youtube && IsValidYouTubeVideo(url.path()) &&
97         LowerCaseEqualsASCII(mime_type, content::kFlashPluginSwfMimeType);
98}
99
100void MobileYouTubePlugin::OpenYoutubeUrlCallback() {
101  std::string youtube("vnd.youtube:");
102  GURL url(youtube.append(GetYoutubeVideoId(GetPluginParams())));
103  WebURLRequest request;
104  request.initialize();
105  request.setURL(url);
106  render_frame()->LoadURLExternally(
107      GetFrame(), request, blink::WebNavigationPolicyNewForegroundTab);
108}
109
110void MobileYouTubePlugin::BindWebFrame(WebFrame* frame) {
111  v8::Isolate* isolate = blink::mainThreadIsolate();
112  v8::HandleScope handle_scope(isolate);
113  v8::Handle<v8::Context> context = frame->mainWorldScriptContext();
114  DCHECK(!context.IsEmpty());
115
116  v8::Context::Scope context_scope(context);
117  v8::Handle<v8::Object> global = context->Global();
118  global->Set(gin::StringToV8(isolate, "plugin"),
119              gin::CreateHandle(isolate, this).ToV8());
120}
121
122gin::ObjectTemplateBuilder MobileYouTubePlugin::GetObjectTemplateBuilder(
123    v8::Isolate* isolate) {
124  return PluginPlaceholder::GetObjectTemplateBuilder(isolate)
125    .SetMethod("openYoutubeURL", &MobileYouTubePlugin::OpenYoutubeUrlCallback);
126}
127
128}  // namespace plugins
129