URLRequestFileJob provides file handle if net::LOAD_ENABLE_DOWNLOAD_FILE

Make URLRequestFileJob to respect net::LOAD_ENABLE_DOWNLOAD_FILE
load flag. It reopens the file specified by file:/// URL and saves
the asynchronous file handle in HttpResponseInfo.

Review URL: http://codereview.chromium.org/42657

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@12605 0039d316-1c4b-4281-b951-d872f2087c98

net/url_request/url_request_file_job.cc

@@ -21,9 +21,11 @@
 
 #include "base/compiler_specific.h"
 #include "base/message_loop.h"
+#include "base/platform_file.h"
 #include "base/string_util.h"
 #include "base/worker_pool.h"
 #include "googleurl/src/gurl.h"
+#include "net/base/load_flags.h"
 #include "net/base/mime_util.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_util.h"
@@ -155,6 +157,24 @@ bool URLRequestFileJob::GetMimeType(std::string* mime_type) const {
   return net::GetMimeTypeFromFile(file_path_, mime_type);
 }
 
+void URLRequestFileJob::GetResponseInfo(net::HttpResponseInfo* info) {
+  DCHECK(request_);
+
+  // If we have enabled downloading the file, the requester expects to receive
+  // a file handle to the file. Since we are serving file:/// url requests we
+  // can provide such a handle if the file exists.
+  bool created;
+  if ((request_->load_flags() & net::LOAD_ENABLE_DOWNLOAD_FILE) &&
+      stream_.IsOpen()) {
+        info->response_data_file =
+            base::CreatePlatformFile(file_path_.ToWStringHack(),
+                                     base::PLATFORM_FILE_OPEN |
+                                     base::PLATFORM_FILE_READ |
+                                     base::PLATFORM_FILE_ASYNC,
+                                     &created);
+  }
+}
+
 void URLRequestFileJob::DidResolve(
     bool exists, const file_util::FileInfo& file_info) {
 #if defined(OS_WIN)

net/url_request/url_request_file_job.h

@@ -25,6 +25,7 @@ class URLRequestFileJob : public URLRequestJob {
   virtual bool ReadRawData(net::IOBuffer* buf, int buf_size, int* bytes_read);
   virtual bool IsRedirectResponse(GURL* location, int* http_status_code);
   virtual bool GetMimeType(std::string* mime_type) const;
+  virtual void GetResponseInfo(net::HttpResponseInfo* info);
 
   static URLRequest::ProtocolFactory Factory;