Replaced static URLRequestFileJob factory with non-static protocol handler for File jobs

net/url_request/file_protocol_handler.cc

Index: net/url_request/file_protocol_handler.cc
diff --git a/net/url_request/file_protocol_handler.cc b/net/url_request/file_protocol_handler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ec77772b57e43882a2d24ce3e83a05f6bdbe8a36
--- /dev/null
+++ b/net/url_request/file_protocol_handler.cc
@@ -0,0 +1,48 @@
+// Copyright (c) 2012 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 "net/url_request/file_protocol_handler.h"
+
+#include "base/logging.h"
+#include "net/base/net_errors.h"
+#include "net/base/net_util.h"
+#include "net/url_request/url_request_error_job.h"
+#include "net/url_request/url_request_file_dir_job.h"
+#include "net/url_request/url_request_file_job.h"
+
+namespace net {
+
+FileProtocolHandler::FileProtocolHandler(
+    NetworkDelegate* network_delegate)
+    : network_delegate_(network_delegate) {
+}
+
+URLRequestJob* FileProtocolHandler::MaybeCreateJob(URLRequest* request) const {
+  FilePath file_path;
+  const bool is_file = FileURLToFilePath(request->url(), &file_path);
+
+  // Check file access permissions.
+  if (!network_delegate_ ||
+      !network_delegate_->CanAccessFile(*request, file_path)) {
+    return new URLRequestErrorJob(request, ERR_ACCESS_DENIED);
+  }
+
+  // We need to decide whether to create URLRequestFileJob for file access or
+  // URLRequestFileDirJob for directory access. To avoid accessing the
+  // filesystem, we only look at the path string here.
+  // The code in the URLRequestFileJob::Start() method discovers that a path,
+  // which doesn't end with a slash, should really be treated as a directory,
+  // and it then redirects to the URLRequestFileDirJob.
+  if (is_file &&
+      file_util::EndsWithSeparator(file_path) &&
+      file_path.IsAbsolute()) {
+    return new URLRequestFileDirJob(request, file_path);
+  }
+
+  // Use a regular file request job for all non-directories (including invalid
+  // file names).
+  return new URLRequestFileJob(request, file_path, network_delegate_);
+}
+
+}  // namespace net