Add m-esr52 at 52.6.0

1 files changed, 182 insertions, 0 deletions

diff --git a/netwerk/base/nsIBackgroundFileSaver.idl b/netwerk/base/nsIBackgroundFileSaver.idl
new file mode 100644
index 000000000..df560d02f
--- /dev/null
+++ b/netwerk/base/nsIBackgroundFileSaver.idl
@@ -0,0 +1,182 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIArray;
+interface nsIBackgroundFileSaverObserver;
+interface nsIFile;
+
+/**
+ * Allows saving data to a file, while handling all the input/output on a
+ * background thread, including the initial file name assignment and any
+ * subsequent renaming of the target file.
+ *
+ * This interface is designed for file downloads.  Generally, they start in the
+ * temporary directory, while the user is selecting the final name.  Then, they
+ * are moved to the chosen target directory with a ".part" extension appended to
+ * the file name.  Finally, they are renamed when the download is completed.
+ *
+ * Components implementing both nsIBackgroundFileSaver and nsIStreamListener
+ * allow data to be fed using an implementation of OnDataAvailable that never
+ * blocks the calling thread.  They suspend the request that drives the stream
+ * listener in case too much data is being fed, and resume it when the data has
+ * been written.  Calling OnStopRequest does not necessarily close the target
+ * file, and the Finish method must be called to complete the operation.
+ *
+ * Components implementing both nsIBackgroundFileSaver and nsIAsyncOutputStream
+ * allow data to be fed directly to the non-blocking output stream, that however
+ * may return NS_BASE_STREAM_WOULD_BLOCK in case too much data is being fed.
+ * Closing the output stream does not necessarily close the target file, and the
+ * Finish method must be called to complete the operation.
+ *
+ * @remarks Implementations may require the consumer to always call Finish.  If
+ *          the object reference is released without calling Finish, a memory
+ *          leak may occur, and the target file might be kept locked. All
+ *          public methods of the interface may only be called from the main
+ *          thread.
+ */
+[scriptable, uuid(c43544a4-682c-4262-b407-2453d26e660d)]
+interface nsIBackgroundFileSaver : nsISupports
+{
+  /**
+   * This observer receives notifications when the target file name changes and
+   * when the operation completes, successfully or not.
+   *
+   * @remarks A strong reference to the observer is held.  Notification events
+   *          are dispatched to the thread that created the object that
+   *          implements nsIBackgroundFileSaver.
+   */
+  attribute nsIBackgroundFileSaverObserver observer;
+
+  /**
+   * An nsIArray of nsIX509CertList, representing a chain of X.509 signatures on
+   * the downloaded file. Each list may belong to a different signer and contain
+   * certificates all the way up to the root.
+   *
+   * @throws NS_ERROR_NOT_AVAILABLE
+   *         In case this is called before the onSaveComplete method has been
+   *         called to notify success, or enableSignatureInfo has not been
+   *         called.
+   */
+  readonly attribute nsIArray signatureInfo;
+
+  /**
+   * The SHA-256 hash, in raw bytes, associated with the data that was saved.
+   *
+   * In case the enableAppend method has been called, the hash computation
+   * includes the contents of the existing file, if any.
+   *
+   * @throws NS_ERROR_NOT_AVAILABLE
+   *         In case the enableSha256 method has not been called, or before the
+   *         onSaveComplete method has been called to notify success.
+   */
+  readonly attribute ACString sha256Hash;
+
+  /**
+   * Instructs the component to compute the signatureInfo of the target file,
+   * and make it available in the signatureInfo property.
+   *
+   * @remarks This must be set on the main thread before the first call to
+   *          setTarget.
+   */
+  void enableSignatureInfo();
+
+  /**
+   * Instructs the component to compute the SHA-256 hash of the target file, and
+   * make it available in the sha256Hash property.
+   *
+   * @remarks This must be set on the main thread before the first call to
+   *          setTarget.
+   */
+  void enableSha256();
+
+  /**
+   * Instructs the component to append data to the initial target file, that
+   * will be specified by the first call to the setTarget method, instead of
+   * overwriting the file.
+   *
+   * If the initial target file does not exist, this method has no effect.
+   *
+   * @remarks This must be set on the main thread before the first call to
+   *          setTarget.
+   */
+  void enableAppend();
+
+  /**
+   * Sets the name of the output file to be written.  The target can be changed
+   * after data has already been fed, in which case the existing file will be
+   * moved to the new destination.
+   *
+   * In case the specified file already exists, and this method is called for
+   * the first time, the file may be either overwritten or appended to, based on
+   * whether the enableAppend method was called.  Subsequent calls always
+   * overwrite the specified target file with the previously saved data.
+   *
+   * No file will be written until this function is called at least once.  It's
+   * recommended not to feed any data until the output file is set.
+   *
+   * If an input/output error occurs with the specified file, the save operation
+   * fails.  Failure is notified asynchronously through the observer.
+   *
+   * @param aTarget
+   *        New output file to be written.
+   * @param aKeepPartial
+   *        Indicates whether aFile should be kept as partially completed,
+   *        rather than deleted, if the operation fails or is canceled.  This is
+   *        generally set for downloads that use temporary ".part" files.
+   */
+  void setTarget(in nsIFile aTarget, in bool aKeepPartial);
+
+  /**
+   * Terminates access to the output file, then notifies the observer with the
+   * specified status code.  A failure code will force the operation to be
+   * canceled, in which case the output file will be deleted if requested.
+   *
+   * This forces the involved streams to be closed, thus no more data should be
+   * fed to the component after this method has been called.
+   *
+   * This is the last method that should be called on this object, and the
+   * target file name cannot be changed anymore after this method has been
+   * called.  Conversely, before calling this method, the file can still be
+   * renamed even if all the data has been fed.
+   *
+   * @param aStatus
+   *        Result code that determines whether the operation should succeed or
+   *        be canceled, and is notified to the observer.  If the operation
+   *        fails meanwhile for other reasons, or the observer has been already
+   *        notified of completion, this status code is ignored.
+   */
+  void finish(in nsresult aStatus);
+};
+
+[scriptable, uuid(ee7058c3-6e54-4411-b76b-3ce87b76fcb6)]
+interface nsIBackgroundFileSaverObserver : nsISupports
+{
+  /**
+   * Called when the name of the output file has been determined.  This function
+   * may be called more than once if the target file is renamed while saving.
+   *
+   * @param aSaver
+   *        Reference to the object that raised the notification.
+   * @param aTarget
+   *        Name of the file that is being written.
+   */
+  void onTargetChange(in nsIBackgroundFileSaver aSaver, in nsIFile aTarget);
+
+  /**
+   * Called when the operation completed, and the target file has been closed.
+   * If the operation succeeded, the target file is ready to be used, otherwise
+   * it might have been already deleted.
+   *
+   * @param aSaver
+   *        Reference to the object that raised the notification.
+   * @param aStatus
+   *        Result code that determines whether the operation succeeded or
+   *        failed, as well as the failure reason.
+   */
+  void onSaveComplete(in nsIBackgroundFileSaver aSaver, in nsresult aStatus);
+};