chrome/common/extensions/file_browser_handler.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/common/extensions/file_browser_handler.h"
   6
   7 #include "base/logging.h"
   8 #include "extensions/common/url_pattern.h"
   9 #include "googleurl/src/gurl.h"
  10
  11 namespace {
  12
  13 const char kReadAccessString[] = "read";
  14 const char kReadWriteAccessString[] = "read-write";
  15 const char kCreateAccessString[] = "create";
  16
  17 unsigned int kPermissionsNotDefined = 0;
  18 unsigned int kReadPermission = 1;
  19 unsigned int kWritePermission = 1 << 1;
  20 unsigned int kCreatePermission = 1 << 2;
  21 unsigned int kInvalidPermission = 1 << 3;
  22
  23 unsigned int GetAccessPermissionFlagFromString(const std::string& access_str) {
  24   if (access_str == kReadAccessString)
  25     return kReadPermission;
  26   if (access_str == kReadWriteAccessString)
  27     return kReadPermission | kWritePermission;
  28   if (access_str == kCreateAccessString)
  29     return kCreatePermission;
  30   return kInvalidPermission;
  31 }
  32
  33 }
  34
  35
  36 FileBrowserHandler::FileBrowserHandler()
  37     : file_access_permission_flags_(kPermissionsNotDefined) {
  38 }
  39
  40 FileBrowserHandler::~FileBrowserHandler() {
  41 }
  42
  43 void FileBrowserHandler::AddPattern(const URLPattern& pattern) {
  44   url_set_.AddPattern(pattern);
  45 }
  46
  47 void FileBrowserHandler::ClearPatterns() {
  48   url_set_.ClearPatterns();
  49 }
  50
  51 bool FileBrowserHandler::MatchesURL(const GURL& url) const {
  52   return url_set_.MatchesURL(url);
  53 }
  54
  55 bool FileBrowserHandler::AddFileAccessPermission(
  56     const std::string& access) {
  57   file_access_permission_flags_ |= GetAccessPermissionFlagFromString(access);
  58   return (file_access_permission_flags_ & kInvalidPermission) != 0U;
  59 }
  60
  61 bool FileBrowserHandler::ValidateFileAccessPermissions() {
  62   bool is_invalid = (file_access_permission_flags_ & kInvalidPermission) != 0U;
  63   bool can_create = (file_access_permission_flags_ & kCreatePermission) != 0U;
  64   bool can_read_or_write = (file_access_permission_flags_ &
  65       (kReadPermission | kWritePermission)) != 0U;
  66   if (is_invalid || (can_create && can_read_or_write)) {
  67     file_access_permission_flags_ = kInvalidPermission;
  68     return false;
  69   }
  70
  71   if (file_access_permission_flags_ == kPermissionsNotDefined)
  72     file_access_permission_flags_ = kReadPermission | kWritePermission;
  73   return true;
  74 }
  75
  76 bool FileBrowserHandler::CanRead() const {
  77   DCHECK(!(file_access_permission_flags_ & kInvalidPermission));
  78   return (file_access_permission_flags_ & kReadPermission) != 0;
  79 }
  80
  81 bool FileBrowserHandler::CanWrite() const {
  82   DCHECK(!(file_access_permission_flags_ & kInvalidPermission));
  83   return (file_access_permission_flags_ & kWritePermission) != 0;
  84 }
  85
  86 bool FileBrowserHandler::HasCreateAccessPermission() const {
  87   DCHECK(!(file_access_permission_flags_ & kInvalidPermission));
  88   return (file_access_permission_flags_ & kCreatePermission) != 0;
  89 }