feat: offboarding: remove ex-admins from relay groups

fix #6

src/team_bot/bot.py

@@ -66,6 +66,11 @@ class RelayPlugin:
             relay_group = self.get_relay_group(message.chat.id)
             relay_group.send_text(f"Sending Message failed:\n\n{error}")
 
+    @account_hookimpl
+    def ac_member_removed(self, chat, contact, actor, message):
+        if chat == self.crew:
+            self.offboard(contact)
+
     @account_hookimpl
     def ac_incoming_message(self, message: deltachat.Message):
         """This method is called on every incoming message and decides what to do with it."""
@@ -262,3 +267,7 @@ class RelayPlugin:
             if mapping[0] == outside_id:
                 return self.account.get_chat_by_id(mapping[1])
         return None
+
+    def offboard(self, ex_admin):
+        for mapping in self.kvstore.get("relays"):
+            self.account.get_chat_by_id(mapping[1]).remove_contact(ex_admin)

tests/test_bot.py

@@ -156,6 +156,13 @@ def test_relay_group_forwarding(relaycrew, outsider):
         for msg in chat.get_messages():
             assert "This is the relay group for" not in msg.text
 
+    # user leaves crew
+    get_user_crew(user).remove_contact(user)
+    # make sure they are also offboarded from relay group
+    user._evtracker.wait_next_incoming_message()
+    for contact in bot_relay_group.get_contacts():
+        assert user.get_config("addr") != contact.addr
+
 
 @pytest.mark.timeout(TIMEOUT)
 def test_default_outside_help(relaycrew, outsider):