When the download folder does not exist, change the download folder to a user's "Downloads"

chrome/browser/download/save_package.cc

 // Copyright (c) 2011 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/download/save_package.h"
 
 #include <algorithm>
 
 #include "base/file_path.h"
 #include "base/file_util.h"
@@ skipping 1249 matching lines @@
   // before calling to it.
   PrefService* prefs = tab_contents()->profile()->GetPrefs();
   FilePath website_save_dir = GetSaveDirPreference(prefs);
   FilePath download_save_dir = prefs->GetFilePath(
       prefs::kDownloadDefaultDirectory);
   std::string mime_type = tab_contents()->contents_mime_type();
 
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
       NewRunnableMethod(this, &SavePackage::CreateDirectoryOnFileThread,
-          website_save_dir, download_save_dir, mime_type));
+                        website_save_dir, download_save_dir, mime_type));
 }
 
 void SavePackage::CreateDirectoryOnFileThread(

[Paweł Hajdan Jr., 2011/06/08 09:50:23]

Interesting, this code seems much duplicated between the save package and
downloaded file. Is it possible to unify those two, or share as much as
possible?

[haraken1, 2011/06/09 10:16:56]

I collected up the duplicated code into ChooseSavableDirectory() in
download_util.cc, although I am not sure whether download_util.cc is a good
place or not. If it is not suitable, please tell me the right place.

     const FilePath& website_save_dir,
     const FilePath& download_save_dir,
     const std::string& mime_type) {
   FilePath save_dir;
-  // If the default html/websites save folder doesn't exist...
-  if (!file_util::DirectoryExists(website_save_dir)) {
-    // If the default download dir doesn't exist, create it.
-    if (!file_util::DirectoryExists(download_save_dir))
-      file_util::CreateDirectory(download_save_dir);
+  if (file_util::PathIsWritable(website_save_dir)) {
+    // If the default html/websites save folder exists,
+    // then use the default html/websites save folder.
+    save_dir = website_save_dir;
+  } else if (file_util::PathIsWritable(download_save_dir)) {
+    // If the default html/websites save folder does not exist
+    // but the default download folder exists,
+    // then use the default download folder.
     save_dir = download_save_dir;
   } else {
-    // If it does exist, use the default save dir param.
-    save_dir = website_save_dir;
+    // If both the above folders do not exist,
+    // use the user's "Downloads" folder.
+    if (!download_util::DefaultDownloadDirectory::Get(&save_dir) ||
+        !file_util::PathIsWritable(save_dir)) {
+      VLOG(1) << "Cannot find the user's writable \"Downloads\" folder.";
+      // Create the |download_save_dir| folder if we cannot get
+      // the user's writable "Downloads" folder (This will be a rare case).
+      save_dir = download_save_dir;
+    }
+    // Make sure that the folder does exist.
+    if (!file_util::CreateDirectory(save_dir))
+      LOG(ERROR) << "Failed to create " << save_dir.value();
   }
 
   bool can_save_as_complete = CanSaveAsComplete(mime_type);
   FilePath suggested_filename = GetSuggestedNameForSaveAs(can_save_as_complete,
                                                           mime_type);
   FilePath::StringType pure_file_name =
       suggested_filename.RemoveExtension().BaseName().value();
   FilePath::StringType file_name_ext = suggested_filename.Extension();
 
   // Need to make sure the suggested file name is not too long.
@@ skipping 169 matching lines @@
 }
 
 // SelectFileDialog::Listener interface.
 void SavePackage::FileSelected(const FilePath& path,
                                int index, void* params) {
   ContinueSave(path, index);
 }
 
 void SavePackage::FileSelectionCanceled(void* params) {
 }