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/WebFrame.h"
  12 #include "third_party/WebKit/public/web/WebView.h"
  13 #include "v8/include/v8.h"
  14
  15 using blink::WebFrame;
  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   virtual 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(
  77           v8::String::NewFromUtf8(isolate, "NativeIsSearchProviderInstalled")))
  78     return v8::FunctionTemplate::New(isolate, IsSearchProviderInstalled);
  79
  80   return v8::Handle<v8::FunctionTemplate>();
  81 }
  82
  83 // static
  84 RenderView* ExternalExtensionWrapper::GetRenderView() {
  85   WebFrame* webframe = WebFrame::frameForCurrentContext();
  86   DCHECK(webframe) << "There should be an active frame since we just got "
  87       "a native function called.";
  88   if (!webframe) return NULL;
  89
  90   WebView* webview = webframe->view();
  91   if (!webview) return NULL;  // can happen during closing
  92
  93   return RenderView::FromWebView(webview);
  94 }
  95
  96 // static
  97 void ExternalExtensionWrapper::AddSearchProvider(
  98     const v8::FunctionCallbackInfo<v8::Value>& args) {
  99   if (!args.Length()) return;
 100
 101   std::string name(*v8::String::Utf8Value(args[0]));
 102   if (name.empty()) return;
 103
 104   RenderView* render_view = GetRenderView();
 105   if (!render_view) return;
 106
 107   GURL osd_url(name);
 108   if (!osd_url.is_empty() && osd_url.is_valid()) {
 109     render_view->Send(new ChromeViewHostMsg_PageHasOSDD(
 110         render_view->GetRoutingID(), render_view->GetPageId(), osd_url,
 111         search_provider::EXPLICIT_PROVIDER));
 112   }
 113 }
 114
 115 // static
 116 void ExternalExtensionWrapper::IsSearchProviderInstalled(
 117     const v8::FunctionCallbackInfo<v8::Value>& args) {
 118   if (!args.Length()) return;
 119   v8::String::Utf8Value utf8name(args[0]);
 120   if (!utf8name.length()) return;
 121
 122   std::string name(*utf8name);
 123   RenderView* render_view = GetRenderView();
 124   if (!render_view) return;
 125
 126   WebFrame* webframe = WebFrame::frameForCurrentContext();
 127   if (!webframe) return;
 128
 129   search_provider::InstallState install = search_provider::DENIED;
 130   GURL inquiry_url = GURL(name);
 131   if (!inquiry_url.is_empty()) {
 132       render_view->Send(new ChromeViewHostMsg_GetSearchProviderInstallState(
 133           render_view->GetRoutingID(),
 134           webframe->document().url(),
 135           inquiry_url,
 136           &install));
 137   }
 138
 139   if (install == search_provider::DENIED) {
 140     // FIXME: throw access denied exception.
 141     v8::Isolate* isolate = args.GetIsolate();
 142     isolate->ThrowException(v8::Exception::Error(v8::String::Empty(isolate)));
 143     return;
 144   }
 145   args.GetReturnValue().Set(static_cast<int32_t>(install));
 146 }
 147
 148 v8::Extension* ExternalExtension::Get() {
 149   return new ExternalExtensionWrapper();
 150 }
 151
 152 }  // namespace extensions_v8