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18a33f72db
If we have an input parameter (or return value) we need to use (nullable). However, if it is an (inout) or (out) parameter, (optional) is sufficient. It looks like (nullable) could be used for everything according to the Annotation documentation, but (optional) is more specific.
477 lines
14 KiB
C
477 lines
14 KiB
C
/*
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* Copyright © 2010 Codethink Limited
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the licence, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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* Author: Ryan Lortie <desrt@desrt.ca>
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*/
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#include "config.h"
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#include "gpermission.h"
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#include "gioerror.h"
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#include "gioenums.h"
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#include "gasyncresult.h"
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#include "gtask.h"
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#include "glibintl.h"
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/**
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* SECTION:gpermission
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* @title: GPermission
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* @short_description: An object representing the permission
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* to perform a certain action
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* @include: gio/gio.h
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*
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* A #GPermission represents the status of the caller's permission to
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* perform a certain action.
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*
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* You can query if the action is currently allowed and if it is
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* possible to acquire the permission so that the action will be allowed
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* in the future.
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*
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* There is also an API to actually acquire the permission and one to
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* release it.
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*
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* As an example, a #GPermission might represent the ability for the
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* user to write to a #GSettings object. This #GPermission object could
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* then be used to decide if it is appropriate to show a "Click here to
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* unlock" button in a dialog and to provide the mechanism to invoke
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* when that button is clicked.
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**/
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/**
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* GPermission:
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*
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* #GPermission is an opaque data structure and can only be accessed
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* using the following functions.
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**/
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struct _GPermissionPrivate
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{
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gboolean allowed;
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gboolean can_acquire;
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gboolean can_release;
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};
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enum {
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PROP_NONE,
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PROP_ALLOWED,
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PROP_CAN_ACQUIRE,
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PROP_CAN_RELEASE
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};
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G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GPermission, g_permission, G_TYPE_OBJECT)
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/**
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* g_permission_acquire:
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* @permission: a #GPermission instance
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* @cancellable: (nullable): a #GCancellable, or %NULL
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* @error: a pointer to a %NULL #GError, or %NULL
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*
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* Attempts to acquire the permission represented by @permission.
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*
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* The precise method by which this happens depends on the permission
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* and the underlying authentication mechanism. A simple example is
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* that a dialog may appear asking the user to enter their password.
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*
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* You should check with g_permission_get_can_acquire() before calling
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* this function.
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*
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* If the permission is acquired then %TRUE is returned. Otherwise,
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* %FALSE is returned and @error is set appropriately.
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*
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* This call is blocking, likely for a very long time (in the case that
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* user interaction is required). See g_permission_acquire_async() for
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* the non-blocking version.
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*
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* Returns: %TRUE if the permission was successfully acquired
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*
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* Since: 2.26
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*/
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gboolean
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g_permission_acquire (GPermission *permission,
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GCancellable *cancellable,
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GError **error)
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{
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g_return_val_if_fail (G_IS_PERMISSION (permission), FALSE);
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return G_PERMISSION_GET_CLASS (permission)
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->acquire (permission, cancellable, error);
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}
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/**
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* g_permission_acquire_async:
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* @permission: a #GPermission instance
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* @cancellable: (nullable): a #GCancellable, or %NULL
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* @callback: the #GAsyncReadyCallback to call when done
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* @user_data: the user data to pass to @callback
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*
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* Attempts to acquire the permission represented by @permission.
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*
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* This is the first half of the asynchronous version of
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* g_permission_acquire().
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*
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* Since: 2.26
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**/
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void
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g_permission_acquire_async (GPermission *permission,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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g_return_if_fail (G_IS_PERMISSION (permission));
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G_PERMISSION_GET_CLASS (permission)
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->acquire_async (permission, cancellable, callback, user_data);
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}
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/**
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* g_permission_acquire_finish:
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* @permission: a #GPermission instance
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* @result: the #GAsyncResult given to the #GAsyncReadyCallback
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* @error: a pointer to a %NULL #GError, or %NULL
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*
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* Collects the result of attempting to acquire the permission
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* represented by @permission.
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*
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* This is the second half of the asynchronous version of
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* g_permission_acquire().
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*
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* Returns: %TRUE if the permission was successfully acquired
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*
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* Since: 2.26
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**/
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gboolean
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g_permission_acquire_finish (GPermission *permission,
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GAsyncResult *result,
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GError **error)
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{
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g_return_val_if_fail (G_IS_PERMISSION (permission), FALSE);
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return G_PERMISSION_GET_CLASS (permission)
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->acquire_finish (permission, result, error);
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}
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/**
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* g_permission_release:
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* @permission: a #GPermission instance
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* @cancellable: (nullable): a #GCancellable, or %NULL
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* @error: a pointer to a %NULL #GError, or %NULL
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*
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* Attempts to release the permission represented by @permission.
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*
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* The precise method by which this happens depends on the permission
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* and the underlying authentication mechanism. In most cases the
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* permission will be dropped immediately without further action.
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*
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* You should check with g_permission_get_can_release() before calling
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* this function.
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*
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* If the permission is released then %TRUE is returned. Otherwise,
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* %FALSE is returned and @error is set appropriately.
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*
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* This call is blocking, likely for a very long time (in the case that
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* user interaction is required). See g_permission_release_async() for
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* the non-blocking version.
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*
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* Returns: %TRUE if the permission was successfully released
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*
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* Since: 2.26
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**/
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gboolean
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g_permission_release (GPermission *permission,
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GCancellable *cancellable,
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GError **error)
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{
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g_return_val_if_fail (G_IS_PERMISSION (permission), FALSE);
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return G_PERMISSION_GET_CLASS (permission)
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->release (permission, cancellable, error);
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}
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/**
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* g_permission_release_async:
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* @permission: a #GPermission instance
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* @cancellable: (nullable): a #GCancellable, or %NULL
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* @callback: the #GAsyncReadyCallback to call when done
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* @user_data: the user data to pass to @callback
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*
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* Attempts to release the permission represented by @permission.
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*
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* This is the first half of the asynchronous version of
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* g_permission_release().
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*
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* Since: 2.26
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**/
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void
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g_permission_release_async (GPermission *permission,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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g_return_if_fail (G_IS_PERMISSION (permission));
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G_PERMISSION_GET_CLASS (permission)
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->release_async (permission, cancellable, callback, user_data);
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}
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/**
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* g_permission_release_finish:
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* @permission: a #GPermission instance
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* @result: the #GAsyncResult given to the #GAsyncReadyCallback
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* @error: a pointer to a %NULL #GError, or %NULL
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*
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* Collects the result of attempting to release the permission
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* represented by @permission.
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*
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* This is the second half of the asynchronous version of
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* g_permission_release().
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*
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* Returns: %TRUE if the permission was successfully released
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*
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* Since: 2.26
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**/
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gboolean
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g_permission_release_finish (GPermission *permission,
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GAsyncResult *result,
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GError **error)
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{
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g_return_val_if_fail (G_IS_PERMISSION (permission), FALSE);
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return G_PERMISSION_GET_CLASS (permission)
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->release_finish (permission, result, error);
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}
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/**
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* g_permission_get_allowed:
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* @permission: a #GPermission instance
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*
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* Gets the value of the 'allowed' property. This property is %TRUE if
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* the caller currently has permission to perform the action that
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* @permission represents the permission to perform.
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*
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* Returns: the value of the 'allowed' property
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*
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* Since: 2.26
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**/
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gboolean
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g_permission_get_allowed (GPermission *permission)
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{
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g_return_val_if_fail (G_IS_PERMISSION (permission), FALSE);
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return permission->priv->allowed;
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}
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/**
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* g_permission_get_can_acquire:
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* @permission: a #GPermission instance
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*
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* Gets the value of the 'can-acquire' property. This property is %TRUE
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* if it is generally possible to acquire the permission by calling
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* g_permission_acquire().
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*
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* Returns: the value of the 'can-acquire' property
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*
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* Since: 2.26
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**/
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gboolean
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g_permission_get_can_acquire (GPermission *permission)
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{
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g_return_val_if_fail (G_IS_PERMISSION (permission), FALSE);
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return permission->priv->can_acquire;
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}
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/**
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* g_permission_get_can_release:
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* @permission: a #GPermission instance
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*
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* Gets the value of the 'can-release' property. This property is %TRUE
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* if it is generally possible to release the permission by calling
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* g_permission_release().
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*
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* Returns: the value of the 'can-release' property
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*
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* Since: 2.26
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**/
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gboolean
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g_permission_get_can_release (GPermission *permission)
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{
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g_return_val_if_fail (G_IS_PERMISSION (permission), FALSE);
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return permission->priv->can_release;
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}
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/**
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* g_permission_impl_update:
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* @permission: a #GPermission instance
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* @allowed: the new value for the 'allowed' property
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* @can_acquire: the new value for the 'can-acquire' property
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* @can_release: the new value for the 'can-release' property
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*
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* This function is called by the #GPermission implementation to update
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* the properties of the permission. You should never call this
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* function except from a #GPermission implementation.
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*
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* GObject notify signals are generated, as appropriate.
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*
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* Since: 2.26
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**/
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void
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g_permission_impl_update (GPermission *permission,
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gboolean allowed,
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gboolean can_acquire,
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gboolean can_release)
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{
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GObject *object;
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g_return_if_fail (G_IS_PERMISSION (permission));
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object = G_OBJECT (permission);
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g_object_freeze_notify (object);
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allowed = allowed != FALSE;
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if (allowed != permission->priv->allowed)
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{
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permission->priv->allowed = allowed;
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g_object_notify (object, "allowed");
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}
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can_acquire = can_acquire != FALSE;
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if (can_acquire != permission->priv->can_acquire)
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{
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permission->priv->can_acquire = can_acquire;
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g_object_notify (object, "can-acquire");
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}
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can_release = can_release != FALSE;
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if (can_release != permission->priv->can_release)
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{
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permission->priv->can_release = can_release;
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g_object_notify (object, "can-release");
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}
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g_object_thaw_notify (object);
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}
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static void
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g_permission_get_property (GObject *object, guint prop_id,
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GValue *value, GParamSpec *pspec)
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{
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GPermission *permission = G_PERMISSION (object);
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switch (prop_id)
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{
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case PROP_ALLOWED:
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g_value_set_boolean (value, permission->priv->allowed);
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break;
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case PROP_CAN_ACQUIRE:
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g_value_set_boolean (value, permission->priv->can_acquire);
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break;
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case PROP_CAN_RELEASE:
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g_value_set_boolean (value, permission->priv->can_release);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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}
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}
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static void
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g_permission_init (GPermission *permission)
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{
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permission->priv = g_permission_get_instance_private (permission);
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}
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static gboolean
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acquire_or_release (GPermission *permission,
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GCancellable *cancellable,
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GError **error)
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{
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g_set_error_literal (error,
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G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
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"Can't acquire or release permission");
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return FALSE;
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}
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static void
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acquire_or_release_async (GPermission *permission,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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g_task_report_new_error (permission,
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callback, user_data,
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NULL,
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G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
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"Can't acquire or release permission");
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}
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static gboolean
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acquire_or_release_finish (GPermission *permission,
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GAsyncResult *result,
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GError **error)
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{
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return g_task_propagate_boolean (G_TASK (result), error);
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}
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static void
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g_permission_class_init (GPermissionClass *class)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (class);
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object_class->get_property = g_permission_get_property;
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class->acquire = acquire_or_release;
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class->release = acquire_or_release;
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class->acquire_async = acquire_or_release_async;
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class->release_async = acquire_or_release_async;
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class->acquire_finish = acquire_or_release_finish;
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class->release_finish = acquire_or_release_finish;
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/**
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* GPermission:allowed:
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*
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* %TRUE if the caller currently has permission to perform the action that
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* @permission represents the permission to perform.
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*/
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g_object_class_install_property (object_class, PROP_ALLOWED,
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g_param_spec_boolean ("allowed",
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P_("Is allowed"),
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P_("If the caller is allowed to perform the action"),
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FALSE,
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G_PARAM_STATIC_STRINGS | G_PARAM_READABLE));
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/**
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* GPermission:can-acquire:
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*
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* %TRUE if it is generally possible to acquire the permission by calling
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* g_permission_acquire().
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*/
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g_object_class_install_property (object_class, PROP_CAN_ACQUIRE,
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g_param_spec_boolean ("can-acquire",
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P_("Can acquire"),
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P_("If calling g_permission_acquire() makes sense"),
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FALSE,
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G_PARAM_STATIC_STRINGS | G_PARAM_READABLE));
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/**
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* GPermission:can-release:
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*
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* %TRUE if it is generally possible to release the permission by calling
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* g_permission_release().
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*/
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g_object_class_install_property (object_class, PROP_CAN_RELEASE,
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g_param_spec_boolean ("can-release",
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P_("Can release"),
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P_("If calling g_permission_release() makes sense"),
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FALSE,
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G_PARAM_STATIC_STRINGS | G_PARAM_READABLE));
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}
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