[openpgp] Be more resistant against invalid keys

openpgp/backend/util.py

@@ -0,0 +1,13 @@
+
+from __future__ import annotations
+
+
+def parse_uid(uid: str, compat=False) -> str:
+    if uid.startswith('xmpp:'):
+        return uid[5:]
+
+    # Compat with uids of form "Name <xmpp:my@jid.com>"
+    if compat and '<xmpp:' in uid and uid.endswith('>'):
+        return uid[:-1].split('<xmpp:', maxsplit=1)[1]
+
+    raise ValueError('Uknown UID format: %s' % uid)