Implement local NTP for fallback.

chrome/browser/instant/local_ntp_source.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/instant/local_ntp_source.h"
+
+#include "base/logging.h"
+#include "base/memory/ref_counted_memory.h"
+#include "base/string_util.h"
+#include "chrome/common/url_constants.h"
+#include "content/public/common/content_client.h"
+#include "googleurl/src/gurl.h"
+#include "grit/browser_resources.h"
+#include "net/url_request/url_request.h"
+
+namespace {
+
+const char kHTMLFilename[] = "local-ntp.html";
+const char kJsFilename[] = "local-ntp.js";
+const char kCSSFilename[] = "local-ntp.css";
+
+}  // namespace
+
+LocalNTPSource::LocalNTPSource() {
+}
+
+LocalNTPSource::~LocalNTPSource() {
+}
+
+std::string LocalNTPSource::GetSource() {
+  return chrome::kChromeSearchLocalNTPHost;
+}
+
+void LocalNTPSource::StartDataRequest(
+    const std::string& path,
+    bool is_incognito,
+    const content::URLDataSource::GotDataCallback& callback) {
+  int identifier = -1;
+  if (path == kHTMLFilename) {
+    identifier = IDR_LOCAL_NTP_HTML;
+  } else if (path == kJsFilename) {
+    identifier = IDR_LOCAL_NTP_JS;
+  } else if (path == kCSSFilename) {
+    identifier = IDR_LOCAL_NTP_CSS;
+  } else {
+    callback.Run(NULL);
+    return;
+  }
+
+  scoped_refptr<base::RefCountedStaticMemory> response(
+      content::GetContentClient()->GetDataResourceBytes(identifier));
+  callback.Run(response);
+}
+
+std::string LocalNTPSource::GetMimeType(
+    const std::string& path) const {
+  if (path == kHTMLFilename)
+    return "text/html";
+  if (path == kJsFilename)
+    return "application/javascript";
+  if (path == kCSSFilename)
+    return "text/css";
+  return "";
+}
+
+bool LocalNTPSource::ShouldServiceRequest(
+    const net::URLRequest* request) const {
+  DCHECK_EQ(request->url().host(), chrome::kChromeSearchLocalNTPHost);
+
+  if (request->url().SchemeIs(chrome::kChromeSearchScheme)) {
+    DCHECK(StartsWithASCII(request->url().path(), "/", true));
+    std::string filename = request->url().path().substr(1);
+    return filename == kHTMLFilename || filename == kJsFilename ||
+        filename == kCSSFilename;
+  }
+  return false;
+}