chrome/common/extensions/api/file_system.idl

   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 // Use the <code>chrome.fileSystem</code> API to create, read, navigate,
   6 // and write to the user's local file system. With this API, Chrome Apps can
   7 // read and write to a user-selected location. For example, a text editor app
   8 // can use the API to read and write local documents. All failures are notified
   9 // via chrome.runtime.lastError.
  10 namespace fileSystem {
  11   dictionary AcceptOption {
  12     // This is the optional text description for this option. If not present,
  13     // a description will be automatically generated; typically containing an
  14     // expanded list of valid extensions (e.g. "text/html" may expand to
  15     // "*.html, *.htm").
  16     DOMString? description;
  17
  18     // Mime-types to accept, e.g. "image/jpeg" or "audio/*". One of mimeTypes or
  19     // extensions must contain at least one valid element.
  20     DOMString[]? mimeTypes;
  21
  22     // Extensions to accept, e.g. "jpg", "gif", "crx".
  23     DOMString[]? extensions;
  24   };
  25
  26   enum ChooseEntryType {
  27
  28     // Prompts the user to open an existing file and returns a FileEntry on
  29     // success. From Chrome 31 onwards, the FileEntry will be writable if the
  30     // application has the 'write' permission under 'fileSystem'; otherwise, the
  31     // FileEntry will be read-only.
  32     openFile,
  33
  34     // Prompts the user to open an existing file and returns a writable
  35     // FileEntry on success. Calls using this type will fail with a runtime
  36     // error if the application doesn't have the 'write' permission under
  37     // 'fileSystem'.
  38     openWritableFile,
  39
  40     // Prompts the user to open an existing file or a new file and returns a
  41     // writable FileEntry on success. Calls using this type will fail with a
  42     // runtime error if the application doesn't have the 'write' permission
  43     // under 'fileSystem'.
  44     saveFile,
  45
  46     // Prompts the user to open a directory and returns a DirectoryEntry on
  47     // success. Calls using this type will fail with a runtime error if the
  48     // application doesn't have the 'directory' permission under 'fileSystem'.
  49     // If the application has the 'write' permission under 'fileSystem', the
  50     // returned DirectoryEntry will be writable; otherwise it will be read-only.
  51     // New in Chrome 31.
  52     openDirectory
  53   };
  54
  55   // Type of a change happened to a child entry within a tracked directory.
  56   enum ChildChangeType {
  57     created,
  58     removed,
  59     changed
  60   };
  61
  62   dictionary ChooseEntryOptions {
  63     // Type of the prompt to show. The default is 'openFile'.
  64     ChooseEntryType? type;
  65
  66     // The suggested file name that will be presented to the user as the
  67     // default name to read or write. This is optional.
  68     DOMString? suggestedName;
  69
  70     // The optional list of accept options for this file opener. Each option
  71     // will be presented as a unique group to the end-user.
  72     AcceptOption[]? accepts;
  73
  74     // Whether to accept all file types, in addition to the options specified
  75     // in the accepts argument. The default is true. If the accepts field is
  76     // unset or contains no valid entries, this will always be reset to true.
  77     boolean? acceptsAllTypes;
  78
  79     // Whether to accept multiple files. This is only supported for openFile and
  80     // openWritableFile. The callback to chooseEntry will be called with a list
  81     // of entries if this is set to true. Otherwise it will be called with a
  82     // single Entry.
  83     boolean? acceptsMultiple;
  84   };
  85
  86   // Change to an entry within a tracked directory.
  87   [nodoc] dictionary ChildChange {
  88     [instanceOf=Entry] object entry;
  89     ChildChangeType type;
  90   };
  91
  92   // Event notifying about a change in a file or a directory, including its
  93   // contents.
  94   [nodoc] dictionary EntryChangedEvent {
  95     // Tracked entry.
  96     [instanceOf=Entry] object target;
  97
  98     // List of changed entries within the tracked directory in order they
  99     // happened. May not be available for some types of file systems.
 100     ChildChange[]? childChanges;
 101   };
 102
 103   // Event notifying about a tracked file or a directory being removed.
 104   [nodoc] dictionary EntryRemovedEvent {
 105     [instanceOf=Entry] object target;
 106   };
 107
 108   callback GetDisplayPathCallback = void (DOMString displayPath);
 109   callback EntryCallback = void ([instanceOf=Entry] object entry);
 110   callback EntriesCallback = void (
 111       [instanceOf=Entry] optional object entry,
 112       [instanceOf=FileEntry] optional object[] fileEntries);
 113   callback IsWritableCallback = void (boolean isWritable);
 114   callback IsRestorableCallback = void (boolean isRestorable);
 115   [nodoc] callback GetObservedEntriesCallback = void (
 116       [instanceOf=Entry] object[] entries);
 117
 118   interface Functions {
 119     // Get the display path of an Entry object. The display path is based on
 120     // the full path of the file or directory on the local file system, but may
 121     // be made more readable for display purposes.
 122     static void getDisplayPath([instanceOf=Entry] object entry,
 123                                GetDisplayPathCallback callback);
 124
 125     // Get a writable Entry from another Entry. This call will fail with a
 126     // runtime error if the application does not have the 'write' permission
 127     // under 'fileSystem'. If entry is a DirectoryEntry, this call will fail if
 128     // the application does not have the 'directory' permission under
 129     // 'fileSystem'.
 130     static void getWritableEntry([instanceOf=Entry] object entry,
 131                                  EntryCallback callback);
 132
 133     // Gets whether this Entry is writable or not.
 134     static void isWritableEntry([instanceOf=Entry] object entry,
 135                                 IsWritableCallback callback);
 136
 137     // Ask the user to choose a file or directory.
 138     static void chooseEntry(optional ChooseEntryOptions options,
 139                             EntriesCallback callback);
 140
 141     // Returns the file entry with the given id if it can be restored. This call
 142     // will fail with a runtime error otherwise.
 143     static void restoreEntry(DOMString id, EntryCallback callback);
 144
 145     // Returns whether the app has permission to restore the entry with the
 146     // given id.
 147     static void isRestorable(DOMString id, IsRestorableCallback callback);
 148
 149     // Returns an id that can be passed to restoreEntry to regain access to a
 150     // given file entry. Only the 500 most recently used entries are retained,
 151     // where calls to retainEntry and restoreEntry count as use. If the app has
 152     // the 'retainEntries' permission under 'fileSystem', entries are retained
 153     // indefinitely. Otherwise, entries are retained only while the app is
 154     // running and across restarts.
 155     static DOMString retainEntry([instanceOf=Entry] object entry);
 156
 157     // Observes a directory entry. Emits an event if the tracked directory is
 158     // changed (including the list of files on it), or removed. If <code>
 159     // recursive</code> is set to true, then also all accessible subdirectories
 160     // will be tracked. Observers are automatically removed once the extension
 161     // is closed or suspended, unless <code>entry</code> is retained using
 162     // <code>chrome.fileSystem.retainEntry</code>.
 163     //
 164     // In such case of retained entries, the observer stays active across
 165     // restarts until <code>unobserveEntry</code> is explicitly called. Note,
 166     // that once the <code>entry</code> is not retained anymore, the observer
 167     // will be removed automatically. Observed entries are also automatically
 168     // restored when either <code>getObservers</code> is called, or an observing
 169     // event for it is invoked.
 170     [nodoc] static void observeDirectory(
 171         [instanceOf=DirectoryEntry] object entry,
 172         optional boolean recursive);
 173
 174     // Unobserves a previously observed either a file or a directory.
 175     [nodoc] static void unobserveEntry([instanceOf=Entry] object entry);
 176
 177     // Lists all observed entries.
 178     [nodoc] static void getObservedEntries(GetObservedEntriesCallback callback);
 179   };
 180
 181   interface Events {
 182     // Called when an observed entry is changed.
 183     [nodoc] static void onEntryChanged(EntryChangedEvent event);
 184
 185     // Called when an observed entry is removed.
 186     [nodoc] static void onEntryRemoved(EntryRemovedEvent event);
 187   };
 188 };