src/chrome/renderer/extensions/chrome_v8_context.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/extensions/chrome_v8_context.h"
   6
   7 #include "base/logging.h"
   8 #include "base/memory/scoped_ptr.h"
   9 #include "base/strings/string_split.h"
  10 #include "base/values.h"
  11 #include "chrome/common/extensions/api/extension_api.h"
  12 #include "chrome/common/extensions/extension.h"
  13 #include "chrome/common/extensions/extension_set.h"
  14 #include "chrome/common/extensions/features/base_feature_provider.h"
  15 #include "chrome/renderer/extensions/chrome_v8_extension.h"
  16 #include "chrome/renderer/extensions/module_system.h"
  17 #include "chrome/renderer/extensions/user_script_slave.h"
  18 #include "content/public/renderer/render_view.h"
  19 #include "content/public/renderer/v8_value_converter.h"
  20 #include "third_party/WebKit/public/web/WebFrame.h"
  21 #include "third_party/WebKit/public/web/WebScopedMicrotaskSuppression.h"
  22 #include "third_party/WebKit/public/web/WebView.h"
  23 #include "v8/include/v8.h"
  24
  25 using content::V8ValueConverter;
  26
  27 namespace extensions {
  28
  29 ChromeV8Context::ChromeV8Context(v8::Handle<v8::Context> v8_context,
  30                                  WebKit::WebFrame* web_frame,
  31                                  const Extension* extension,
  32                                  Feature::Context context_type)
  33     : v8_context_(v8_context),
  34       web_frame_(web_frame),
  35       extension_(extension),
  36       context_type_(context_type),
  37       safe_builtins_(this),
  38       isolate_(v8_context->GetIsolate()) {
  39   VLOG(1) << "Created context:\n"
  40           << "  extension id: " << GetExtensionID() << "\n"
  41           << "  frame:        " << web_frame_ << "\n"
  42           << "  context type: " << GetContextTypeDescription();
  43 }
  44
  45 ChromeV8Context::~ChromeV8Context() {
  46   VLOG(1) << "Destroyed context for extension\n"
  47           << "  extension id: " << GetExtensionID();
  48   Invalidate();
  49 }
  50
  51 void ChromeV8Context::Invalidate() {
  52   if (!is_valid())
  53     return;
  54   if (module_system_)
  55     module_system_->Invalidate();
  56   web_frame_ = NULL;
  57   v8_context_.reset();
  58 }
  59
  60 std::string ChromeV8Context::GetExtensionID() const {
  61   return extension_.get() ? extension_->id() : std::string();
  62 }
  63
  64 content::RenderView* ChromeV8Context::GetRenderView() const {
  65   if (web_frame_ && web_frame_->view())
  66     return content::RenderView::FromWebView(web_frame_->view());
  67   else
  68     return NULL;
  69 }
  70
  71 GURL ChromeV8Context::GetURL() const {
  72   return web_frame_ ?
  73       UserScriptSlave::GetDataSourceURLForFrame(web_frame_) : GURL();
  74 }
  75
  76 v8::Local<v8::Value> ChromeV8Context::CallFunction(
  77     v8::Handle<v8::Function> function,
  78     int argc,
  79     v8::Handle<v8::Value> argv[]) const {
  80   v8::HandleScope handle_scope(isolate());
  81   v8::Context::Scope scope(v8_context());
  82
  83   WebKit::WebScopedMicrotaskSuppression suppression;
  84   if (!is_valid())
  85     return handle_scope.Close(v8::Undefined());
  86
  87   v8::Handle<v8::Object> global = v8_context()->Global();
  88   if (!web_frame_)
  89     return handle_scope.Close(function->Call(global, argc, argv));
  90   return handle_scope.Close(
  91       web_frame_->callFunctionEvenIfScriptDisabled(function,
  92                                                    global,
  93                                                    argc,
  94                                                    argv));
  95 }
  96
  97 bool ChromeV8Context::IsAnyFeatureAvailableToContext(
  98     const std::string& api_name) {
  99   return ExtensionAPI::GetSharedInstance()->IsAnyFeatureAvailableToContext(
 100       api_name,
 101       extension_.get(),
 102       context_type_,
 103       UserScriptSlave::GetDataSourceURLForFrame(web_frame_));
 104 }
 105
 106 Feature::Availability ChromeV8Context::GetAvailability(
 107     const std::string& api_name) {
 108   return ExtensionAPI::GetSharedInstance()->IsAvailable(api_name,
 109                                                         extension_.get(),
 110                                                         context_type_,
 111                                                         GetURL());
 112 }
 113
 114 void ChromeV8Context::DispatchOnUnloadEvent() {
 115   module_system_->CallModuleMethod("unload_event", "dispatch");
 116 }
 117
 118 std::string ChromeV8Context::GetContextTypeDescription() {
 119   switch (context_type_) {
 120     case Feature::UNSPECIFIED_CONTEXT:         return "UNSPECIFIED";
 121     case Feature::BLESSED_EXTENSION_CONTEXT:   return "BLESSED_EXTENSION";
 122     case Feature::UNBLESSED_EXTENSION_CONTEXT: return "UNBLESSED_EXTENSION";
 123     case Feature::CONTENT_SCRIPT_CONTEXT:      return "CONTENT_SCRIPT";
 124     case Feature::WEB_PAGE_CONTEXT:            return "WEB_PAGE";
 125   }
 126   NOTREACHED();
 127   return std::string();
 128 }
 129
 130 ChromeV8Context* ChromeV8Context::GetContext() {
 131   return this;
 132 }
 133
 134 void ChromeV8Context::OnResponseReceived(const std::string& name,
 135                                          int request_id,
 136                                          bool success,
 137                                          const base::ListValue& response,
 138                                          const std::string& error) {
 139   v8::HandleScope handle_scope(isolate());
 140
 141   scoped_ptr<V8ValueConverter> converter(V8ValueConverter::create());
 142   v8::Handle<v8::Value> argv[] = {
 143     v8::Integer::New(request_id),
 144     v8::String::New(name.c_str()),
 145     v8::Boolean::New(success),
 146     converter->ToV8Value(&response, v8_context_.NewHandle(isolate())),
 147     v8::String::New(error.c_str())
 148   };
 149
 150   v8::Handle<v8::Value> retval = module_system_->CallModuleMethod(
 151       "sendRequest", "handleResponse", arraysize(argv), argv);
 152
 153   // In debug, the js will validate the callback parameters and return a
 154   // string if a validation error has occured.
 155   if (DCHECK_IS_ON()) {
 156     if (!retval.IsEmpty() && !retval->IsUndefined()) {
 157       std::string error = *v8::String::AsciiValue(retval);
 158       DCHECK(false) << error;
 159     }
 160   }
 161 }
 162
 163 }  // namespace extensions