content/renderer/pepper/plugin_object.cc

   1 // Copyright (c) 2011 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 "content/renderer/pepper/plugin_object.h"
   6
   7 #include "base/bind.h"
   8 #include "base/logging.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/strings/string_number_conversions.h"
  12 #include "base/strings/string_util.h"
  13 #include "content/renderer/pepper/pepper_plugin_instance_impl.h"
  14 #include "content/renderer/pepper/pepper_try_catch.h"
  15 #include "content/renderer/pepper/plugin_module.h"
  16 #include "content/renderer/pepper/v8_var_converter.h"
  17 #include "gin/arguments.h"
  18 #include "gin/converter.h"
  19 #include "gin/function_template.h"
  20 #include "gin/handle.h"
  21 #include "gin/interceptor.h"
  22 #include "gin/object_template_builder.h"
  23 #include "gin/public/gin_embedders.h"
  24 #include "ppapi/c/dev/ppb_var_deprecated.h"
  25 #include "ppapi/c/dev/ppp_class_deprecated.h"
  26 #include "ppapi/c/pp_resource.h"
  27 #include "ppapi/c/pp_var.h"
  28 #include "ppapi/shared_impl/ppapi_globals.h"
  29 #include "ppapi/shared_impl/resource_tracker.h"
  30 #include "ppapi/shared_impl/var.h"
  31 #include "ppapi/shared_impl/var_tracker.h"
  32
  33 using ppapi::PpapiGlobals;
  34 using ppapi::ScopedPPVar;
  35 using ppapi::ScopedPPVarArray;
  36 using ppapi::StringVar;
  37 using ppapi::Var;
  38
  39 namespace content {
  40
  41 namespace {
  42
  43 const char kInvalidValueException[] = "Error: Invalid value";
  44
  45 }  // namespace
  46
  47 // PluginObject ----------------------------------------------------------------
  48
  49 PluginObject::~PluginObject() {
  50   if (instance_) {
  51     ppp_class_->Deallocate(ppp_class_data_);
  52     instance_->RemovePluginObject(this);
  53   }
  54 }
  55
  56 // static
  57 gin::WrapperInfo PluginObject::kWrapperInfo = {gin::kEmbedderNativeGin};
  58
  59 // static
  60 PluginObject* PluginObject::FromV8Object(v8::Isolate* isolate,
  61                                          v8::Handle<v8::Object> v8_object) {
  62   PluginObject* plugin_object;
  63   if (!v8_object.IsEmpty() &&
  64       gin::ConvertFromV8(isolate, v8_object, &plugin_object)) {
  65     return plugin_object;
  66   }
  67   return NULL;
  68 }
  69
  70 // static
  71 PP_Var PluginObject::Create(PepperPluginInstanceImpl* instance,
  72                             const PPP_Class_Deprecated* ppp_class,
  73                             void* ppp_class_data) {
  74   V8VarConverter var_converter(instance->pp_instance(),
  75                                V8VarConverter::kAllowObjectVars);
  76   PepperTryCatchVar try_catch(instance, &var_converter, NULL);
  77   gin::Handle<PluginObject> object =
  78       gin::CreateHandle(instance->GetIsolate(),
  79                         new PluginObject(instance, ppp_class, ppp_class_data));
  80   ScopedPPVar result = try_catch.FromV8(object.ToV8());
  81   DCHECK(!try_catch.HasException());
  82   return result.Release();
  83 }
  84
  85 v8::Local<v8::Value> PluginObject::GetNamedProperty(
  86     v8::Isolate* isolate,
  87     const std::string& identifier) {
  88   ScopedPPVar identifier_var(ScopedPPVar::PassRef(),
  89                              StringVar::StringToPPVar(identifier));
  90   return GetPropertyOrMethod(instance_->GetIsolate(), identifier_var.get());
  91 }
  92
  93 bool PluginObject::SetNamedProperty(v8::Isolate* isolate,
  94                                     const std::string& identifier,
  95                                     v8::Local<v8::Value> value) {
  96   if (!instance_)
  97     return false;
  98   ScopedPPVar identifier_var(ScopedPPVar::PassRef(),
  99                              StringVar::StringToPPVar(identifier));
 100   V8VarConverter var_converter(instance_->pp_instance(),
 101                                V8VarConverter::kAllowObjectVars);
 102   PepperTryCatchV8 try_catch(instance_, &var_converter, isolate);
 103
 104   bool has_property =
 105       ppp_class_->HasProperty(ppp_class_data_, identifier_var.get(),
 106                               try_catch.exception());
 107   if (try_catch.ThrowException())
 108     return false;
 109
 110   if (!has_property)
 111     return false;
 112
 113   ScopedPPVar var = try_catch.FromV8(value);
 114   if (try_catch.ThrowException())
 115     return false;
 116
 117   ppp_class_->SetProperty(ppp_class_data_, identifier_var.get(), var.get(),
 118                           try_catch.exception());
 119
 120   // If the plugin threw an exception, then throw a V8 version of it to
 121   // JavaScript. Either way, return true, because we successfully dispatched
 122   // the call to the plugin.
 123   try_catch.ThrowException();
 124   return true;
 125 }
 126
 127 std::vector<std::string> PluginObject::EnumerateNamedProperties(
 128     v8::Isolate* isolate) {
 129   std::vector<std::string> result;
 130   if (!instance_)
 131     return result;
 132
 133   V8VarConverter var_converter(instance_->pp_instance(),
 134                                V8VarConverter::kAllowObjectVars);
 135   PepperTryCatchV8 try_catch(instance_, &var_converter, isolate);
 136
 137   PP_Var* name_vars;
 138   uint32_t count = 0;
 139   ppp_class_->GetAllPropertyNames(ppp_class_data_, &count, &name_vars,
 140                                   try_catch.exception());
 141   ScopedPPVarArray scoped_name_vars(
 142       ScopedPPVarArray::PassPPBMemoryAllocatedArray(), name_vars, count);
 143
 144   if (try_catch.ThrowException())
 145     return result;
 146
 147   for (uint32_t i = 0; i < count; ++i) {
 148     StringVar* string_var = StringVar::FromPPVar(name_vars[i]);
 149     if (string_var) {
 150       result.push_back(string_var->value());
 151     } else {
 152       try_catch.ThrowException(kInvalidValueException);
 153       result.clear();
 154       return result;
 155     }
 156   }
 157
 158   return result;
 159 }
 160
 161 void PluginObject::InstanceDeleted() {
 162   instance_ = NULL;
 163 }
 164
 165 PluginObject::PluginObject(PepperPluginInstanceImpl* instance,
 166                            const PPP_Class_Deprecated* ppp_class,
 167                            void* ppp_class_data)
 168     : gin::NamedPropertyInterceptor(instance->GetIsolate(), this),
 169       instance_(instance),
 170       ppp_class_(ppp_class),
 171       ppp_class_data_(ppp_class_data),
 172       weak_factory_(this),
 173       template_cache_(instance->GetIsolate()) {
 174   instance_->AddPluginObject(this);
 175 }
 176
 177 gin::ObjectTemplateBuilder PluginObject::GetObjectTemplateBuilder(
 178     v8::Isolate* isolate) {
 179   return Wrappable<PluginObject>::GetObjectTemplateBuilder(isolate)
 180       .AddNamedPropertyInterceptor();
 181 }
 182
 183 v8::Local<v8::Value> PluginObject::GetPropertyOrMethod(v8::Isolate* isolate,
 184                                                        PP_Var identifier_var) {
 185   if (!instance_)
 186     return v8::Local<v8::Value>();
 187
 188   V8VarConverter var_converter(instance_->pp_instance(),
 189                                V8VarConverter::kAllowObjectVars);
 190   PepperTryCatchV8 try_catch(instance_, &var_converter, isolate);
 191   bool has_property =
 192       ppp_class_->HasProperty(ppp_class_data_, identifier_var,
 193                               try_catch.exception());
 194   if (try_catch.ThrowException())
 195     return v8::Local<v8::Value>();
 196
 197   if (has_property) {
 198     ScopedPPVar result_var(ScopedPPVar::PassRef(),
 199         ppp_class_->GetProperty(ppp_class_data_, identifier_var,
 200                                 try_catch.exception()));
 201     if (try_catch.ThrowException())
 202       return v8::Local<v8::Value>();
 203
 204     v8::Handle<v8::Value> result = try_catch.ToV8(result_var.get());
 205     if (try_catch.ThrowException())
 206       return v8::Local<v8::Value>();
 207
 208     return result;
 209   }
 210
 211   bool has_method = identifier_var.type == PP_VARTYPE_STRING &&
 212                     ppp_class_->HasMethod(ppp_class_data_, identifier_var,
 213                                           try_catch.exception());
 214   if (try_catch.ThrowException())
 215     return v8::Local<v8::Value>();
 216
 217   if (has_method) {
 218     const std::string& identifier =
 219         StringVar::FromPPVar(identifier_var)->value();
 220     return GetFunctionTemplate(isolate, identifier)->GetFunction();
 221   }
 222
 223   return v8::Local<v8::Value>();
 224 }
 225
 226 void PluginObject::Call(const std::string& identifier,
 227                         gin::Arguments* args) {
 228   if (!instance_)
 229     return;
 230
 231   V8VarConverter var_converter(instance_->pp_instance(),
 232                                V8VarConverter::kAllowObjectVars);
 233   PepperTryCatchV8 try_catch(instance_, &var_converter, args->isolate());
 234   ScopedPPVar identifier_var(ScopedPPVar::PassRef(),
 235                              StringVar::StringToPPVar(identifier));
 236   ScopedPPVarArray argument_vars(args->Length());
 237
 238   for (uint32_t i = 0; i < argument_vars.size(); ++i) {
 239     v8::Handle<v8::Value> arg;
 240     if (!args->GetNext(&arg)) {
 241       NOTREACHED();
 242     }
 243
 244     argument_vars.Set(i, try_catch.FromV8(arg));
 245     if (try_catch.ThrowException())
 246       return;
 247   }
 248
 249   // For the OOP plugin case we need to grab a reference on the plugin module
 250   // object to ensure that it is not destroyed courtesy an incoming
 251   // ExecuteScript call which destroys the plugin module and in turn the
 252   // dispatcher.
 253   scoped_refptr<PluginModule> ref(instance_->module());
 254
 255   ScopedPPVar result_var(ScopedPPVar::PassRef(),
 256       ppp_class_->Call(ppp_class_data_, identifier_var.get(),
 257                        argument_vars.size(), argument_vars.get(),
 258                        try_catch.exception()));
 259   if (try_catch.ThrowException())
 260     return;
 261
 262   v8::Handle<v8::Value> result = try_catch.ToV8(result_var.get());
 263   if (try_catch.ThrowException())
 264     return;
 265
 266   args->Return(result);
 267 }
 268
 269 v8::Local<v8::FunctionTemplate> PluginObject::GetFunctionTemplate(
 270     v8::Isolate* isolate,
 271     const std::string& name) {
 272   v8::Local<v8::FunctionTemplate> function_template = template_cache_.Get(name);
 273   if (!function_template.IsEmpty())
 274     return function_template;
 275   function_template =
 276       gin::CreateFunctionTemplate(
 277           isolate, base::Bind(&PluginObject::Call, weak_factory_.GetWeakPtr(),
 278                               name));
 279   template_cache_.Set(name, function_template);
 280   return function_template;
 281 }
 282
 283 }  // namespace content