session-limits: Add mct_session_limits_is_enabled() API

This is a high-level API to indicate whether parental controls are
‘enabled’ for the given user. It’s a mirror of
`mct_app_filter_is_enabled()`, and exposes the existing
`time_limit_enabled_out` argument of
`mct_session_limits_check_time_remaining()` more conveniently.

Includes tests.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

libmalcontent/session-limits.c

@@ -98,6 +98,31 @@ mct_session_limits_get_user_id (MctSessionLimits *limits)
   return limits->user_id;
 }
 
+/**
+ * mct_session_limits_is_enabled:
+ * @limits: an #MctSessionLimits
+ *
+ * Check whether any session limits are enabled and are going to impose at least
+ * one restriction on the user. This gives a high level view of whether session
+ * limit parental controls are ‘enabled’ for the given user.
+ *
+ * This function is equivalent to the value returned by the
+ * `time_limit_enabled_out` argument of
+ * mct_session_limits_check_time_remaining().
+ *
+ * Returns: %TRUE if the session limits object contains at least one restrictive
+ *    session limit, %FALSE if there are no limits in place
+ * Since: 0.7.0
+ */
+gboolean
+mct_session_limits_is_enabled (MctSessionLimits *limits)
+{
+  g_return_val_if_fail (limits != NULL, FALSE);
+  g_return_val_if_fail (limits->ref_count >= 1, FALSE);
+
+  return (limits->limit_type != MCT_SESSION_LIMITS_TYPE_NONE);
+}
+
 /**
  * mct_session_limits_check_time_remaining:
  * @limits: an #MctSessionLimits

libmalcontent/session-limits.h

@@ -52,6 +52,9 @@ void              mct_session_limits_unref (MctSessionLimits *limits);
 G_DEFINE_AUTOPTR_CLEANUP_FUNC (MctSessionLimits, mct_session_limits_unref)
 
 uid_t    mct_session_limits_get_user_id          (MctSessionLimits *limits);
+
+gboolean mct_session_limits_is_enabled           (MctSessionLimits *limits);
+
 gboolean mct_session_limits_check_time_remaining (MctSessionLimits *limits,
                                                   guint64           now_usecs,
                                                   guint64          *time_remaining_secs_out,

libmalcontent/tests/session-limits.c

@@ -518,6 +518,7 @@ test_session_limits_bus_get (BusFixture    *fixture,
 
   /* Check the session limits properties. */
   g_assert_cmpuint (mct_session_limits_get_user_id (session_limits), ==, fixture->valid_uid);
+  g_assert_true (mct_session_limits_is_enabled (session_limits));
   g_assert_false (mct_session_limits_check_time_remaining (session_limits, usec (0),
                                                            &time_remaining_secs, &time_limit_enabled));
   g_assert_true (time_limit_enabled);
@@ -580,6 +581,7 @@ test_session_limits_bus_get_none (BusFixture    *fixture,
 
   /* Check the session limits properties. */
   g_assert_cmpuint (mct_session_limits_get_user_id (session_limits), ==, fixture->valid_uid);
+  g_assert_false (mct_session_limits_is_enabled (session_limits));
   g_assert_true (mct_session_limits_check_time_remaining (session_limits, usec (0),
                                                           &time_remaining_secs, &time_limit_enabled));
   g_assert_false (time_limit_enabled);