File API changes needed for safely passing user selected file entities from the file browser component extension to a 3rd party extension.

BUG=chromium-os:11996
TEST=FileAccessPermissionsTest.FileAccessChecks
Review URL: http://codereview.chromium.org/6810037

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@81860 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 58 insertions, 0 deletions

diff --git a/webkit/chromeos/fileapi/file_access_permissions.cc b/webkit/chromeos/fileapi/file_access_permissions.cc
new file mode 100644
index 0000000..6ab5a04
--- /dev/null
+++ b/webkit/chromeos/fileapi/file_access_permissions.cc
@@ -0,0 +1,58 @@
+// 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 "webkit/chromeos/fileapi/file_access_permissions.h"
+
+#include "base/command_line.h"
+#include "base/logging.h"
+
+namespace chromeos {
+
+FileAccessPermissions::FileAccessPermissions() {}
+
+FileAccessPermissions::~FileAccessPermissions() {}
+
+
+void FileAccessPermissions::GrantAccessPermission(
+    const std::string& extension_id, const FilePath& path) {
+  base::AutoLock locker(lock_);
+  PathAccessMap::iterator path_map_iter = path_map_.find(extension_id);
+  if (path_map_iter == path_map_.end()) {
+    PathSet path_set;
+    path_set.insert(path);
+    path_map_.insert(PathAccessMap::value_type(extension_id, path_set));
+  } else {
+    if (path_map_iter->second.find(path) != path_map_iter->second.end())
+      return;
+    path_map_iter->second.insert(path);
+  }
+}
+
+bool FileAccessPermissions::HasAccessPermission(
+    const std::string& extension_id, const FilePath& path) {
+  base::AutoLock locker(lock_);
+  PathAccessMap::const_iterator path_map_iter = path_map_.find(extension_id);
+  if (path_map_iter == path_map_.end())
+    return false;
+
+  // Check this file and walk up its directory tree to find if this extension
+  // has access to it.
+  FilePath current_path = path.StripTrailingSeparators();
+  FilePath last_path;
+  while (current_path != last_path) {
+    if (path_map_iter->second.find(current_path) != path_map_iter->second.end())
+      return true;
+    last_path = current_path;
+    current_path = current_path.DirName();
+  }
+  return false;
+}
+
+void FileAccessPermissions::RevokePermissions(
+    const std::string& extension_id) {
+  base::AutoLock locker(lock_);
+  path_map_.erase(extension_id);
+}
+
+}