src/chrome/renderer/external_extension.cc

   1 // Copyright (c) 2012 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 "chrome/renderer/external_extension.h"
   6
   7 #include "chrome/common/render_messages.h"
   8 #include "chrome/common/search_provider.h"
   9 #include "content/public/renderer/render_view.h"
  10 #include "third_party/WebKit/public/web/WebDocument.h"
  11 #include "third_party/WebKit/public/web/WebLocalFrame.h"
  12 #include "third_party/WebKit/public/web/WebView.h"
  13 #include "v8/include/v8.h"
  14
  15 using blink::WebLocalFrame;
  16 using blink::WebView;
  17 using content::RenderView;
  18
  19 namespace extensions_v8 {
  20
  21 namespace {
  22
  23 const char* const kSearchProviderApi =
  24     "var external;"
  25     "if (!external)"
  26     "  external = {};"
  27     "external.AddSearchProvider = function(name) {"
  28     "  native function NativeAddSearchProvider();"
  29     "  NativeAddSearchProvider(name);"
  30     "};"
  31     "external.IsSearchProviderInstalled = function(name) {"
  32     "  native function NativeIsSearchProviderInstalled();"
  33     "  return NativeIsSearchProviderInstalled(name);"
  34     "};";
  35
  36 const char kExternalExtensionName[] = "v8/External";
  37
  38 }  // namespace
  39
  40 class ExternalExtensionWrapper : public v8::Extension {
  41  public:
  42   ExternalExtensionWrapper();
  43
  44   // Allows v8's javascript code to call the native functions defined
  45   // in this class for window.external.
  46   v8::Handle<v8::FunctionTemplate> GetNativeFunctionTemplate(
  47       v8::Isolate* isolate,
  48       v8::Handle<v8::String> name) override;
  49
  50   // Helper function to find the RenderView. May return NULL.
  51   static RenderView* GetRenderView();
  52
  53   // Implementation of window.external.AddSearchProvider.
  54   static void AddSearchProvider(
  55       const v8::FunctionCallbackInfo<v8::Value>& args);
  56
  57   // Implementation of window.external.IsSearchProviderInstalled.
  58   static void IsSearchProviderInstalled(
  59       const v8::FunctionCallbackInfo<v8::Value>& args);
  60
  61  private:
  62   DISALLOW_COPY_AND_ASSIGN(ExternalExtensionWrapper);
  63 };
  64
  65 ExternalExtensionWrapper::ExternalExtensionWrapper()
  66     : v8::Extension(kExternalExtensionName, kSearchProviderApi) {
  67 }
  68
  69 v8::Handle<v8::FunctionTemplate>
  70 ExternalExtensionWrapper::GetNativeFunctionTemplate(
  71     v8::Isolate* isolate,
  72     v8::Handle<v8::String> name) {
  73   if (name->Equals(v8::String::NewFromUtf8(isolate, "NativeAddSearchProvider")))
  74     return v8::FunctionTemplate::New(isolate, AddSearchProvider);
  75
  76   if (name->Equals(v8::String::NewFromUtf8(
  77           isolate, "NativeIsSearchProviderInstalled"))) {
  78     return v8::FunctionTemplate::New(isolate, IsSearchProviderInstalled);
  79   }
  80
  81   return v8::Handle<v8::FunctionTemplate>();
  82 }
  83
  84 // static
  85 RenderView* ExternalExtensionWrapper::GetRenderView() {
  86   WebLocalFrame* webframe = WebLocalFrame::frameForCurrentContext();
  87   DCHECK(webframe) << "There should be an active frame since we just got "
  88       "a native function called.";
  89   if (!webframe)
  90     return NULL;
  91
  92   WebView* webview = webframe->view();
  93   if (!webview)
  94     return NULL;  // can happen during closing
  95
  96   return RenderView::FromWebView(webview);
  97 }
  98
  99 // static
 100 void ExternalExtensionWrapper::AddSearchProvider(
 101     const v8::FunctionCallbackInfo<v8::Value>& args) {
 102   if (!args.Length() || !args[0]->IsString())
 103     return;
 104
 105   std::string osdd_string(*v8::String::Utf8Value(args[0]));
 106   if (osdd_string.empty())
 107     return;
 108
 109   RenderView* render_view = GetRenderView();
 110   if (!render_view)
 111     return;
 112
 113   WebLocalFrame* webframe = WebLocalFrame::frameForCurrentContext();
 114   if (!webframe)
 115     return;
 116
 117   GURL osdd_url(osdd_string);
 118   if (!osdd_url.is_empty() && osdd_url.is_valid()) {
 119     render_view->Send(new ChromeViewHostMsg_PageHasOSDD(
 120         render_view->GetRoutingID(), webframe->document().url(), osdd_url,
 121         search_provider::EXPLICIT_PROVIDER));
 122   }
 123 }
 124
 125 // static
 126 void ExternalExtensionWrapper::IsSearchProviderInstalled(
 127     const v8::FunctionCallbackInfo<v8::Value>& args) {
 128   if (!args.Length() || !args[0]->IsString())
 129     return;
 130
 131   v8::String::Utf8Value utf8name(args[0]);
 132   if (!utf8name.length())
 133     return;
 134
 135   std::string name(*utf8name);
 136   RenderView* render_view = GetRenderView();
 137   if (!render_view)
 138     return;
 139
 140   WebLocalFrame* webframe = WebLocalFrame::frameForCurrentContext();
 141   if (!webframe)
 142     return;
 143
 144   search_provider::InstallState install = search_provider::DENIED;
 145   GURL inquiry_url = GURL(name);
 146   if (!inquiry_url.is_empty()) {
 147       render_view->Send(new ChromeViewHostMsg_GetSearchProviderInstallState(
 148           render_view->GetRoutingID(),
 149           webframe->document().url(),
 150           inquiry_url,
 151           &install));
 152   }
 153
 154   if (install == search_provider::DENIED) {
 155     // FIXME: throw access denied exception.
 156     v8::Isolate* isolate = args.GetIsolate();
 157     isolate->ThrowException(v8::Exception::Error(v8::String::Empty(isolate)));
 158     return;
 159   }
 160   args.GetReturnValue().Set(static_cast<int32_t>(install));
 161 }
 162
 163 v8::Extension* ExternalExtension::Get() {
 164   return new ExternalExtensionWrapper();
 165 }
 166
 167 }  // namespace extensions_v8