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      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/i18n_custom_bindings.h"
      6 
      7 #include "base/bind.h"
      8 #include "chrome/common/extensions/extension_messages.h"
      9 #include "chrome/common/extensions/message_bundle.h"
     10 #include "content/public/renderer/render_view.h"
     11 #include "grit/renderer_resources.h"
     12 #include "v8/include/v8.h"
     13 
     14 namespace extensions {
     15 
     16 I18NCustomBindings::I18NCustomBindings(Dispatcher* dispatcher,
     17                                        ChromeV8Context* context)
     18     : ChromeV8Extension(dispatcher, context) {
     19   RouteFunction("GetL10nMessage",
     20       base::Bind(&I18NCustomBindings::GetL10nMessage, base::Unretained(this)));
     21 }
     22 
     23 void I18NCustomBindings::GetL10nMessage(
     24     const v8::FunctionCallbackInfo<v8::Value>& args) {
     25   if (args.Length() != 3 || !args[0]->IsString()) {
     26     NOTREACHED() << "Bad arguments";
     27     return;
     28   }
     29 
     30   std::string extension_id;
     31   if (args[2]->IsNull() || !args[2]->IsString()) {
     32     return;
     33   } else {
     34     extension_id = *v8::String::Utf8Value(args[2]->ToString());
     35     if (extension_id.empty())
     36       return;
     37   }
     38 
     39   L10nMessagesMap* l10n_messages = GetL10nMessagesMap(extension_id);
     40   if (!l10n_messages) {
     41     // Get the current RenderView so that we can send a routed IPC message
     42     // from the correct source.
     43     content::RenderView* renderview = GetRenderView();
     44     if (!renderview)
     45       return;
     46 
     47     L10nMessagesMap messages;
     48     // A sync call to load message catalogs for current extension.
     49     renderview->Send(new ExtensionHostMsg_GetMessageBundle(
     50         extension_id, &messages));
     51 
     52     // Save messages we got.
     53     ExtensionToL10nMessagesMap& l10n_messages_map =
     54         *GetExtensionToL10nMessagesMap();
     55     l10n_messages_map[extension_id] = messages;
     56 
     57     l10n_messages = GetL10nMessagesMap(extension_id);
     58   }
     59 
     60   std::string message_name = *v8::String::Utf8Value(args[0]);
     61   std::string message =
     62       MessageBundle::GetL10nMessage(message_name, *l10n_messages);
     63 
     64   std::vector<std::string> substitutions;
     65   if (args[1]->IsArray()) {
     66     // chrome.i18n.getMessage("message_name", ["more", "params"]);
     67     v8::Local<v8::Array> placeholders = v8::Local<v8::Array>::Cast(args[1]);
     68     uint32_t count = placeholders->Length();
     69     if (count > 9)
     70       return;
     71     for (uint32_t i = 0; i < count; ++i) {
     72       substitutions.push_back(
     73           *v8::String::Utf8Value(
     74               placeholders->Get(v8::Integer::New(i))->ToString()));
     75     }
     76   } else if (args[1]->IsString()) {
     77     // chrome.i18n.getMessage("message_name", "one param");
     78     substitutions.push_back(*v8::String::Utf8Value(args[1]->ToString()));
     79   }
     80 
     81   args.GetReturnValue().Set(
     82       v8::String::NewFromUtf8(args.GetIsolate(), ReplaceStringPlaceholders(
     83         message, substitutions, NULL).c_str()));
     84 }
     85 
     86 }  // namespace extensions
     87