Prompt user for file access permission before download starts

chrome/browser/download/download_target_determiner.h

 // 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.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_TARGET_DETERMINER_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_TARGET_DETERMINER_H_
 
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 75 matching lines @@
   static bool IsAdobeReaderUpToDate();
 #endif
 
  private:
   // The main workflow is controlled via a set of state transitions. Each state
   // has an associated handler. The handler for STATE_FOO is DoFoo. Each handler
   // performs work, determines the next state to transition to and returns a
   // Result indicating how the workflow should proceed. The loop ends when a
   // handler returns COMPLETE.
   enum State {
+    STATE_PROMPT_USER_FOR_PERMISSION,
     STATE_GENERATE_TARGET_PATH,
     STATE_NOTIFY_EXTENSIONS,
     STATE_RESERVE_VIRTUAL_PATH,
     STATE_PROMPT_USER_FOR_DOWNLOAD_PATH,
     STATE_DETERMINE_LOCAL_PATH,
     STATE_DETERMINE_MIME_TYPE,
     STATE_DETERMINE_IF_HANDLED_SAFELY_BY_BROWSER,
     STATE_DETERMINE_IF_ADOBE_READER_UP_TO_DATE,
     STATE_CHECK_DOWNLOAD_URL,
     STATE_CHECK_VISITED_REFERRER_BEFORE,
@@ skipping 35 matching lines @@
 
   ~DownloadTargetDeterminer() override;
 
   // Invoke each successive handler until a handler returns QUIT_DOLOOP or
   // COMPLETE. Note that as a result, this object might be deleted. So |this|
   // should not be accessed after calling DoLoop().
   void DoLoop();
 
   // === Main workflow ===
 
+  // Prompts user for file access if necessary.
+  // Next state:
+  // - STATE_GENERATE_TARGET_PATH.
+  Result DoPromptUserForPermission();
+
+#if defined(OS_ANDROID)
+  // Callback invoked after the file access prompt completes. Cancels the
+  // download if the user doesn't grant file access.
+  void PromptUserForPermissionDone(bool granted);
+#endif
+
   // Generates an initial target path. This target is based only on the state of
   // the download item.
   // Next state:
   // - STATE_NONE : If the download is not in progress, returns COMPLETE.
   // - STATE_NOTIFY_EXTENSIONS : All other downloads.
   Result DoGenerateTargetPath();
 
   // Notifies downloads extensions. If any extension wishes to override the
   // download filename, it will respond to the OnDeterminingFilename()
   // notification.
@@ skipping 156 matching lines @@
   DownloadTargetDeterminerDelegate* delegate_;
   CompletionCallback completion_callback_;
   base::CancelableTaskTracker history_tracker_;
 
   base::WeakPtrFactory<DownloadTargetDeterminer> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadTargetDeterminer);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_TARGET_DETERMINER_H_