components/filesystem/file_system_impl.cc

   1 // Copyright 2015 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 "components/filesystem/file_system_impl.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/files/file_path.h"
   9 #include "base/files/file_util.h"
  10 #include "base/files/scoped_file.h"
  11 #include "base/files/scoped_temp_dir.h"
  12 #include "base/logging.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "components/filesystem/directory_impl.h"
  15 #include "components/filesystem/file_system_app.h"
  16 #include "mojo/application/public/cpp/application_connection.h"
  17 #include "url/gurl.h"
  18
  19 #if defined(OS_WIN)
  20 #include "base/base_paths_win.h"
  21 #include "base/path_service.h"
  22 #include "base/strings/utf_string_conversions.h"
  23 #elif defined(OS_ANDROID)
  24 #include "base/base_paths_android.h"
  25 #include "base/path_service.h"
  26 #elif defined(OS_LINUX)
  27 #include "base/environment.h"
  28 #include "base/nix/xdg_util.h"
  29 #elif defined(OS_MACOSX)
  30 #include "base/base_paths_mac.h"
  31 #include "base/path_service.h"
  32 #endif
  33
  34 namespace filesystem {
  35
  36 namespace {
  37
  38 const char kEscapeChar = ',';
  39
  40 const char kUserDataDir[] = "user-data-dir";
  41
  42 }  // namespace filesystem
  43
  44 FileSystemImpl::FileSystemImpl(FileSystemApp* app,
  45                                mojo::ApplicationConnection* connection,
  46                                mojo::InterfaceRequest<FileSystem> request)
  47     : app_(app),
  48       remote_application_url_(connection->GetRemoteApplicationURL()),
  49       binding_(this, request.Pass()) {
  50 }
  51
  52 FileSystemImpl::~FileSystemImpl() {
  53 }
  54
  55 void FileSystemImpl::OpenFileSystem(const mojo::String& file_system,
  56                                     mojo::InterfaceRequest<Directory> directory,
  57                                     FileSystemClientPtr client,
  58                                     const OpenFileSystemCallback& callback) {
  59   // Set only if the |DirectoryImpl| will own a temporary directory.
  60   scoped_ptr<base::ScopedTempDir> temp_dir;
  61   base::FilePath path;
  62   if (file_system.get() == std::string("temp")) {
  63     temp_dir.reset(new base::ScopedTempDir);
  64     CHECK(temp_dir->CreateUniqueTempDir());
  65     path = temp_dir->path();
  66   } else if (file_system.get() == std::string("origin")) {
  67     base::FilePath base_profile_dir = GetSystemProfileDir();
  68
  69     // Sanitize the url for disk access.
  70     //
  71     // TODO(erg): While it's currently impossible, we need to deal with http://
  72     // URLs that have a path. (Or make the decision that these file systems are
  73     // path bound, not origin bound.)
  74     std::string sanitized_origin;
  75     BuildSanitizedOrigin(remote_application_url_, &sanitized_origin);
  76
  77 #if defined(OS_WIN)
  78     path = base_profile_dir.Append(base::UTF8ToWide(sanitized_origin));
  79 #else
  80     path = base_profile_dir.Append(sanitized_origin);
  81 #endif
  82     if (!base::PathExists(path))
  83       base::CreateDirectory(path);
  84   }
  85
  86   if (!path.empty()) {
  87     DirectoryImpl* dir_impl =
  88         new DirectoryImpl(directory.Pass(), path, temp_dir.Pass());
  89     app_->RegisterDirectoryToClient(dir_impl, client.Pass());
  90     callback.Run(FILE_ERROR_OK);
  91   } else {
  92     callback.Run(FILE_ERROR_FAILED);
  93   }
  94 }
  95
  96 base::FilePath FileSystemImpl::GetSystemProfileDir() const {
  97   base::FilePath path;
  98
  99   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 100   if (command_line->HasSwitch(kUserDataDir)) {
 101     path = command_line->GetSwitchValuePath(kUserDataDir);
 102   } else {
 103 #if defined(OS_WIN)
 104     CHECK(PathService::Get(base::DIR_LOCAL_APP_DATA, &path));
 105     path = path.Append(FILE_PATH_LITERAL("mandoline"));
 106 #elif defined(OS_LINUX)
 107     scoped_ptr<base::Environment> env(base::Environment::Create());
 108     base::FilePath config_dir(
 109         base::nix::GetXDGDirectory(env.get(),
 110                                    base::nix::kXdgConfigHomeEnvVar,
 111                                    base::nix::kDotConfigDir));
 112     path = config_dir.Append("mandoline");
 113 #elif defined(OS_MACOSX)
 114     CHECK(PathService::Get(base::DIR_APP_DATA, &path));
 115     path = path.Append("Mandoline Shell");
 116 #elif defined(OS_ANDROID)
 117     CHECK(PathService::Get(base::DIR_ANDROID_APP_DATA, &path));
 118     path = path.Append(FILE_PATH_LITERAL("mandoline"));
 119 #else
 120     NOTIMPLEMENTED();
 121 #endif
 122   }
 123
 124   if (!base::PathExists(path))
 125     base::CreateDirectory(path);
 126
 127   return path;
 128 }
 129
 130 void FileSystemImpl::BuildSanitizedOrigin(
 131     const std::string& origin,
 132     std::string* sanitized_origin) {
 133   // We take the origin string, and encode it in a way safe for filesystem
 134   // access. This is vaguely based on //net/tools/dump_cache/
 135   // url_to_filename_encoder.h; that file strips out schemes, and does weird
 136   // things with subdirectories. We do follow the basic algorithm used there,
 137   // including using ',' as our escape character.
 138   for (size_t i = 0; i < origin.length(); ++i) {
 139     unsigned char ch = origin[i];
 140     char encoded[3];
 141     int encoded_len;
 142     if ((ch == '_') || (ch == '.') || (ch == '=') || (ch == '+') ||
 143         (ch == '-') || (('0' <= ch) && (ch <= '9')) ||
 144         (('A' <= ch) && (ch <= 'Z')) || (('a' <= ch) && (ch <= 'z'))) {
 145       encoded[0] = ch;
 146       encoded_len = 1;
 147     } else {
 148       encoded[0] = kEscapeChar;
 149       encoded[1] = ch / 16;
 150       encoded[1] += (encoded[1] >= 10) ? 'A' - 10 : '0';
 151       encoded[2] = ch % 16;
 152       encoded[2] += (encoded[2] >= 10) ? 'A' - 10 : '0';
 153       encoded_len = 3;
 154     }
 155     sanitized_origin->append(encoded, encoded_len);
 156   }
 157 }
 158
 159 }  // namespace filesystem