media/mojo/interfaces/cdm_storage.mojom

// Copyright 2017 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.

module media.mojom;

import "mojo/common/file.mojom";

// Provides a way to organize persistent per-origin/per-cdm-type data
// in the browser's file system.
interface CdmStorage {
  enum Status {
    kSuccess,  // File was successfully opened.
    kInUse,    // File is already open by another client.
    kFailure   // Unable to open file.
  };

  // Opens the file specified by |file_name| for read or write. Can be called
  // multiple times for different files, or for the same file if the first one
  // has been closed. If successful, kSuccess will be returned, |file| can
  // be used to access the contents, and |releaser| should be closed when
  // access to the file is no longer needed (i.e. file closed). On failure,
  // |status| <> kSuccess and |file| and |releaser| are null.
  // - If the file is already opened by another CDM instance, kInUse will
  //   be returned in |status|.
  // - |file_name| must not contain forward slash ('/') or backslash ('\'),
  //   and must not start with an underscore ('_'). If this happens,
  //   |status| == kFailure is returned.
  // - if |key_system| passed to Initialize() is not recognized, kFailure
  //   will be returned.
  Open(string file_name)
    => (Status status,
        mojo.common.mojom.File? file,
        associated CdmFileReleaser? releaser);
};

// Provides a way to keep track of the file opened. When the connection to this
// object is broken, it is assumed that the file has been closed and that no
// more operations will be performed on it.
interface CdmFileReleaser {
};