Embeds offline voice recognizer plugin and its manager to app-list start page.

chrome/browser/ui/webui/app_list/start_page_ui.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/app_list/start_page_ui.h"
 
+#include "base/file_util.h"
+#include "base/files/file_path.h"
+#include "base/memory/ref_counted_memory.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/sys_info.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/webui/app_list/start_page_handler.h"
 #include "chrome/common/url_constants.h"
+#include "content/public/browser/browser_thread.h"
 #include "content/public/browser/web_ui.h"
 #include "content/public/browser/web_ui_data_source.h"
 #include "grit/browser_resources.h"
 
 namespace app_list {
+namespace {
+#if defined(OS_CHROMEOS)
+const char* kHotwordFilenames[] = {
+  "dnn",
+  "ep_acoustic_model",
+  "hclg_shotword",
+  "hotword_arm.nexe",
+  "hotword_classifier",
+  "hotword_normalizer",
+  "hotword_word_symbols",
+  "hotword_x86_32.nexe",
+  "hotword_x86_64.nexe",
+  "okgoogle_hotword.config",
+  "phonelist",
+  "phone_state_map",
+};
+
+const char kHotwordFilesDir[] = "/opt/google/hotword";
+
+void LoadModelData(const std::string& path,
+                   const content::WebUIDataSource::GotDataCallback& callback) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
+  // Will be owned by |callback|.
+  scoped_refptr<base::RefCountedString> data(new base::RefCountedString());
+  base::FilePath base_dir(kHotwordFilesDir);
+  base::ReadFileToString(base_dir.AppendASCII(path), &(data->data()));
+  callback.Run(data.get());
+}
+
+bool HandleHotwordFilesResourceFilter(
+    const std::string& path,
+    const content::WebUIDataSource::GotDataCallback& callback) {
+  for (size_t i = 0; i < arraysize(kHotwordFilenames); ++i) {
+    if (path == kHotwordFilenames[i]) {
+      content::BrowserThread::PostTask(
+          content::BrowserThread::FILE,
+          FROM_HERE,
+          base::Bind(&LoadModelData, path, callback));
+      return true;
+    }
+  }
+
+  return false;
+}
+#endif  // OS_CHROMEOS
+}  // namespace
 
 StartPageUI::StartPageUI(content::WebUI* web_ui)
     : content::WebUIController(web_ui) {
   web_ui->AddMessageHandler(new StartPageHandler);
   InitDataSource();
 }
 
 StartPageUI::~StartPageUI() {}
 
 void StartPageUI::InitDataSource() {
   scoped_ptr<content::WebUIDataSource> source(
       content::WebUIDataSource::Create(chrome::kChromeUIAppListStartPageHost));
 
   source->SetUseJsonJSFormatV2();
   source->SetJsonPath("strings.js");
 
   source->AddResourcePath("start_page.css", IDR_APP_LIST_START_PAGE_CSS);
   source->AddResourcePath("start_page.js", IDR_APP_LIST_START_PAGE_JS);
   source->SetDefaultResource(IDR_APP_LIST_START_PAGE_HTML);
 
+#if defined(OS_CHROMEOS)
+  source->OverrideContentSecurityPolicyObjectSrc("object-src 'self' data:;");
+  if (base::SysInfo::IsRunningOnChromeOS())
+    source->SetRequestFilter(base::Bind(&HandleHotwordFilesResourceFilter));
+#endif
+
   content::WebUIDataSource::Add(Profile::FromWebUI(web_ui()), source.release());
 }
 
 }  // namespace app_list