Revert 188912 "Removed static factories for data, ftp, file, and..."

trunk/src/net/url_request/url_request_file_job.cc

 // 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.
 
 // For loading files, we make use of overlapped i/o to ensure that reading from
 // the filesystem (e.g., a network filesystem) does not block the calling
 // thread.  An alternative approach would be to use a background thread or pool
 // of threads, but it seems better to leverage the operating system's ability
 // to do background file reads for us.
 //
@@ skipping 44 matching lines @@
 URLRequestFileJob::URLRequestFileJob(URLRequest* request,
                                      NetworkDelegate* network_delegate,
                                      const base::FilePath& file_path)
     : URLRequestJob(request, network_delegate),
       file_path_(file_path),
       stream_(new FileStream(NULL)),
       remaining_bytes_(0),
       weak_ptr_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
 }
 
+// static
+URLRequestJob* URLRequestFileJob::Factory(URLRequest* request,
+                                          NetworkDelegate* network_delegate,
+                                          const std::string& scheme) {
+  base::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, network_delegate, 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, network_delegate, file_path);
+
+  // Use a regular file request job for all non-directories (including invalid
+  // file names).
+  return new URLRequestFileJob(request, network_delegate, file_path);
+}
+
 void URLRequestFileJob::Start() {
   FileMetaInfo* meta_info = new FileMetaInfo();
   base::WorkerPool::PostTaskAndReply(
       FROM_HERE,
       base::Bind(&URLRequestFileJob::FetchMetaInfo, file_path_,
                  base::Unretained(meta_info)),
       base::Bind(&URLRequestFileJob::DidFetchMetaInfo,
                  weak_ptr_factory_.GetWeakPtr(),
                  base::Owned(meta_info)),
       true);
@@ skipping 215 matching lines @@
     NotifyDone(URLRequestStatus(URLRequestStatus::FAILED, result));
   }
 
   remaining_bytes_ -= result;
   DCHECK_GE(remaining_bytes_, 0);
 
   NotifyReadComplete(result);
 }
 
 }  // namespace net