libeos-parental-controls: Add a getter for OARS sections from a filter

Allow the set of OARS sections set in a filter to be queried.

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

https://phabricator.endlessm.com/T24024

libeos-parental-controls/app-filter.c

@@ -196,6 +196,51 @@ epc_app_filter_is_flatpak_ref_allowed (EpcAppFilter *filter,
     }
 }
 
+static gint
+strcmp_cb (gconstpointer a,
+           gconstpointer b)
+{
+  const gchar *str_a = *((const gchar * const *) a);
+  const gchar *str_b = *((const gchar * const *) b);
+
+  return g_strcmp0 (str_a, str_b);
+}
+
+/**
+ * epc_app_filter_get_oars_sections:
+ * @filter: an #EpcAppFilter
+ *
+ * List the OARS sections present in this app filter. The sections are returned
+ * in lexicographic order. A section will be listed even if its stored value is
+ * %EPC_APP_FILTER_OARS_VALUE_UNKNOWN. The returned list may be empty.
+ *
+ * Returns: (transfer container) (array zero-terminated=1): %NULL-terminated
+ *    array of OARS sections
+ * Since: 0.1.0
+ */
+const gchar **
+epc_app_filter_get_oars_sections (EpcAppFilter *filter)
+{
+  g_autoptr(GPtrArray) sections = g_ptr_array_new_with_free_func (NULL);
+  GVariantIter iter;
+  const gchar *oars_section;
+
+  g_return_val_if_fail (filter != NULL, NULL);
+  g_return_val_if_fail (filter->ref_count >= 1, NULL);
+
+  g_variant_iter_init (&iter, filter->oars_ratings);
+
+  while (g_variant_iter_loop (&iter, "{&s&s}", &oars_section, NULL))
+    g_ptr_array_add (sections, (gpointer) oars_section);
+
+  /* Sort alphabetically for easier comparisons later. */
+  g_ptr_array_sort (sections, strcmp_cb);
+
+  g_ptr_array_add (sections, NULL);  /* NULL terminator */
+
+  return (const gchar **) g_ptr_array_free (g_steal_pointer (&sections), FALSE);
+}
+
 /**
  * epc_app_filter_get_oars_value:
  * @filter: an #EpcAppFilter

libeos-parental-controls/app-filter.h

@@ -103,8 +103,9 @@ gboolean epc_app_filter_is_path_allowed        (EpcAppFilter *filter,
 gboolean epc_app_filter_is_flatpak_ref_allowed (EpcAppFilter *filter,
                                                 const gchar  *flatpak_ref);
 
-EpcAppFilterOarsValue epc_app_filter_get_oars_value (EpcAppFilter *filter,
-                                                     const gchar  *oars_section);
+const gchar           **epc_app_filter_get_oars_sections (EpcAppFilter *filter);
+EpcAppFilterOarsValue   epc_app_filter_get_oars_value    (EpcAppFilter *filter,
+                                                          const gchar  *oars_section);
 
 EpcAppFilter *epc_get_app_filter        (GDBusConnection      *connection,
                                          uid_t                 user_id,

libeos-parental-controls/tests/app-filter.c

@@ -29,6 +29,21 @@
 #include <string.h>
 
 
+/* Check two arrays contain exactly the same items in the same order. */
+static void
+assert_strv_equal (const gchar * const *strv_a,
+                   const gchar * const *strv_b)
+{
+  gsize i;
+
+  for (i = 0; strv_a[i] != NULL && strv_b[i] != NULL; i++)
+    g_assert_cmpstr (strv_a[i], ==, strv_b[i]);
+
+  g_assert_null (strv_a[i]);
+  g_assert_null (strv_b[i]);
+}
+
+
 /* A placeholder smoketest which checks that the error quark works. */
 static void
 test_app_filter_error_quark (void)
@@ -98,6 +113,7 @@ test_app_filter_builder_non_empty (BuilderFixture *fixture,
                                    gconstpointer   test_data)
 {
   g_autoptr(EpcAppFilter) filter = NULL;
+  g_autofree const gchar **sections = NULL;
 
   epc_app_filter_builder_blacklist_path (fixture->builder, "/bin/true");
   epc_app_filter_builder_blacklist_path (fixture->builder, "/usr/bin/gnome-software");
@@ -127,6 +143,10 @@ test_app_filter_builder_non_empty (BuilderFixture *fixture,
                    EPC_APP_FILTER_OARS_VALUE_MODERATE);
   g_assert_cmpint (epc_app_filter_get_oars_value (filter, "something-else"), ==,
                    EPC_APP_FILTER_OARS_VALUE_UNKNOWN);
+
+  sections = epc_app_filter_get_oars_sections (filter);
+  const gchar * const expected_sections[] = { "drugs-alcohol", "language-humor", NULL };
+  assert_strv_equal ((const gchar * const *) sections, expected_sections);
 }
 
 /* Test building an empty #EpcAppFilter using an #EpcAppFilterBuilder. */
@@ -135,6 +155,7 @@ test_app_filter_builder_empty (BuilderFixture *fixture,
                                gconstpointer   test_data)
 {
   g_autoptr(EpcAppFilter) filter = NULL;
+  g_autofree const gchar **sections = NULL;
 
   filter = epc_app_filter_builder_end (fixture->builder);
 
@@ -153,6 +174,10 @@ test_app_filter_builder_empty (BuilderFixture *fixture,
                    EPC_APP_FILTER_OARS_VALUE_UNKNOWN);
   g_assert_cmpint (epc_app_filter_get_oars_value (filter, "something-else"), ==,
                    EPC_APP_FILTER_OARS_VALUE_UNKNOWN);
+
+  sections = epc_app_filter_get_oars_sections (filter);
+  const gchar * const expected_sections[] = { NULL };
+  assert_strv_equal ((const gchar * const *) sections, expected_sections);
 }
 
 /* Check that copying a cleared #EpcAppFilterBuilder works, and the copy can