extensions/common/file_util.cc

   1 // Copyright 2013 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 "extensions/common/file_util.h"
   6
   7 #include <string>
   8
   9 #include "base/file_util.h"
  10 #include "base/files/file_path.h"
  11 #include "net/base/escape.h"
  12 #include "url/gurl.h"
  13
  14 namespace extensions {
  15 namespace file_util {
  16
  17 base::FilePath ExtensionURLToRelativeFilePath(const GURL& url) {
  18   std::string url_path = url.path();
  19   if (url_path.empty() || url_path[0] != '/')
  20     return base::FilePath();
  21
  22   // Drop the leading slashes and convert %-encoded UTF8 to regular UTF8.
  23   std::string file_path = net::UnescapeURLComponent(url_path,
  24       net::UnescapeRule::SPACES | net::UnescapeRule::URL_SPECIAL_CHARS);
  25   size_t skip = file_path.find_first_not_of("/\\");
  26   if (skip != file_path.npos)
  27     file_path = file_path.substr(skip);
  28
  29   base::FilePath path = base::FilePath::FromUTF8Unsafe(file_path);
  30
  31   // It's still possible for someone to construct an annoying URL whose path
  32   // would still wind up not being considered relative at this point.
  33   // For example: chrome-extension://id/c:////foo.html
  34   if (path.IsAbsolute())
  35     return base::FilePath();
  36
  37   return path;
  38 }
  39
  40 base::FilePath ExtensionResourceURLToFilePath(const GURL& url,
  41                                               const base::FilePath& root) {
  42   std::string host = net::UnescapeURLComponent(url.host(),
  43       net::UnescapeRule::SPACES | net::UnescapeRule::URL_SPECIAL_CHARS);
  44   if (host.empty())
  45     return base::FilePath();
  46
  47   base::FilePath relative_path = ExtensionURLToRelativeFilePath(url);
  48   if (relative_path.empty())
  49     return base::FilePath();
  50
  51   base::FilePath path = root.AppendASCII(host).Append(relative_path);
  52   if (!base::PathExists(path))
  53     return base::FilePath();
  54   path = base::MakeAbsoluteFilePath(path);
  55   if (path.empty() || !root.IsParent(path))
  56     return base::FilePath();
  57   return path;
  58 }
  59
  60 }  // namespace file_util
  61 }  // namespace extensions