Add two functions from fwupd for checking GUID strings

3 files changed, 95 insertions, 0 deletions

diff --git a/libappstream-glib/as-self-test.c b/libappstream-glib/as-self-test.c
index 00cfdf8..cb6020c 100644
--- a/libappstream-glib/as-self-test.c
+++ b/libappstream-glib/as-self-test.c
@@ -3210,6 +3210,26 @@ as_test_store_speed_desktop_func (void)
 }
 
 static void
+as_test_utils_guid_func (void)
+{
+	_cleanup_free_ gchar *guid = NULL;
+
+	/* invalid */
+	g_assert (!as_utils_guid_is_valid (NULL));
+	g_assert (!as_utils_guid_is_valid (""));
+	g_assert (!as_utils_guid_is_valid ("1ff60ab2-3905-06a1-b476"));
+	g_assert (!as_utils_guid_is_valid ("1ff60ab2-XXXX-XXXX-XXXX-0371f00c9e9b"));
+	g_assert (!as_utils_guid_is_valid (" 1ff60ab2-3905-06a1-b476-0371f00c9e9b"));
+
+	/* valid */
+	g_assert (as_utils_guid_is_valid ("1ff60ab2-3905-06a1-b476-0371f00c9e9b"));
+
+	/* make valid */
+	guid = as_utils_guid_from_string ("0x8086:0x0406");
+	g_assert_cmpstr (guid, ==, "1ff60ab2-3905-06a1-b476-0371f00c9e9b");
+}
+
+static void
 as_test_utils_icons_func (void)
 {
 	gchar *tmp;
@@ -4197,6 +4217,7 @@ main (int argc, char **argv)
 	g_test_add_func ("/AppStream/node{intltool}", as_test_node_intltool_func);
 	g_test_add_func ("/AppStream/node{sort}", as_test_node_sort_func);
 	g_test_add_func ("/AppStream/utils", as_test_utils_func);
+	g_test_add_func ("/AppStream/utils{guid}", as_test_utils_guid_func);
 	g_test_add_func ("/AppStream/utils{icons}", as_test_utils_icons_func);
 	g_test_add_func ("/AppStream/utils{spdx-token}", as_test_utils_spdx_token_func);
 	g_test_add_func ("/AppStream/utils{install-filename}", as_test_utils_install_filename_func);
diff --git a/libappstream-glib/as-utils.c b/libappstream-glib/as-utils.c
index 3c63860..4b31e50 100644
--- a/libappstream-glib/as-utils.c
+++ b/libappstream-glib/as-utils.c
@@ -1513,3 +1513,75 @@ as_ptr_array_find_string (GPtrArray *array, const gchar *value)
 	}
 	return NULL;
 }
+
+/**
+ * as_utils_guid_is_xdigit:
+ **/
+static gboolean
+as_utils_guid_is_xdigit (const gchar *str)
+{
+	guint i;
+	for (i = 0; str[i] != '\0'; i++) {
+		if (!g_ascii_isxdigit (str[i]))
+			return FALSE;
+	}
+	return TRUE;
+}
+
+/**
+ * as_utils_guid_is_valid:
+ * @guid: string to check
+ *
+ * Checks the source string is a valid string GUID descriptor.
+ *
+ * Returns: %TRUE if @guid was a valid GUID, %FALSE otherwise
+ *
+ * Since: 0.5.0
+ **/
+gboolean
+as_utils_guid_is_valid (const gchar *guid)
+{
+	_cleanup_strv_free_ gchar **split = NULL;
+	if (guid == NULL)
+		return FALSE;
+	split = g_strsplit (guid, "-", -1);
+	if (g_strv_length (split) != 5)
+		return FALSE;
+	if (strlen (split[0]) != 8 || !as_utils_guid_is_xdigit (split[0]))
+		return FALSE;
+	if (strlen (split[1]) != 4 || !as_utils_guid_is_xdigit (split[1]))
+		return FALSE;
+	if (strlen (split[2]) != 4 || !as_utils_guid_is_xdigit (split[2]))
+		return FALSE;
+	if (strlen (split[3]) != 4 || !as_utils_guid_is_xdigit (split[3]))
+		return FALSE;
+	if (strlen (split[4]) != 12 || !as_utils_guid_is_xdigit (split[4]))
+		return FALSE;
+	return TRUE;
+}
+
+/**
+ * as_utils_guid_from_string:
+ * @str: A source string to use as a key
+ *
+ * Returns a GUID for a given string. This uses SHA1 and some string
+ * modification so even small differences in the @str will produce radically
+ * different GUID return values.
+ *
+ * Returns: A new GUID, or %NULL if the string was invalid
+ *
+ * Since: 0.5.0
+ **/
+gchar *
+as_utils_guid_from_string (const gchar *str)
+{
+	gchar *tmp;
+	tmp = g_compute_checksum_for_string (G_CHECKSUM_SHA1, str, -1);
+	tmp[8] = '-';
+	tmp[13] = '-';
+	tmp[18] = '-';
+	tmp[23] = '-';
+	tmp[36] = '\0';
+	g_assert (as_utils_guid_is_valid (tmp));
+	return tmp;
+}
diff --git a/libappstream-glib/as-utils.h b/libappstream-glib/as-utils.h
index 62e0ffc..26c819b 100644
--- a/libappstream-glib/as-utils.h
+++ b/libappstream-glib/as-utils.h
@@ -126,6 +126,8 @@ gboolean	 as_utils_search_token_valid	(const gchar	*token);
 gchar		**as_utils_search_tokenize	(const gchar	*search);
 gint		 as_utils_vercmp		(const gchar	*version_a,
 						 const gchar	*version_b);
+gboolean	 as_utils_guid_is_valid		(const gchar	*guid);
+gchar		*as_utils_guid_from_string	(const gchar	*str);
 
 G_END_DECLS