feat: set group name and topic

Implements: https://todo.sr.ht/~nicoco/slidge-whatsapp/24

slidge_whatsapp/group.py

@@ -42,6 +42,8 @@ class MUC(LegacyMUC[str, str, Participant, str]):
 
     _ALL_INFO_FILLED_ON_STARTUP = True
 
+    HAS_DESCRIPTION = False
+
     def __init__(self, *a, **kw):
         super().__init__(*a, **kw)
         self.sent = dict[str, str]()
@@ -110,6 +112,19 @@ class MUC(LegacyMUC[str, str, Participant, str]):
             self.legacy_id, await get_bytes_temp(data) if data else ""
         )
 
+    async def on_set_config(
+        self,
+        name: Optional[str],
+        description: Optional[str],
+    ):
+        # there are no group descriptions in WA, but topics=subjects
+        if self.name != name:
+            self.session.whatsapp.SetGroupName(self.legacy_id, name)
+
+    async def on_set_subject(self, subject: str):
+        if self.subject != subject:
+            self.session.whatsapp.SetGroupTopic(self.legacy_id, subject)
+
 
 class Bookmarks(LegacyBookmarks[str, MUC]):
     session: "Session"

slidge_whatsapp/session.go

@@ -493,6 +493,34 @@ func (s *Session) SetAvatar(resourceID, avatarPath string) (string, error) {
 	}
 }
 
+// SetGroupName updates the name of a WhatsApp group
+func (s *Session) SetGroupName(resourceID, name string) error {
+	if s.client == nil || s.client.Store.ID == nil {
+		return fmt.Errorf("Cannot set group name for unauthenticated session")
+	}
+
+	jid, err := types.ParseJID(resourceID)
+	if err != nil {
+		return fmt.Errorf("Could not parse JID for group name change: %s", err)
+	}
+
+	return s.client.SetGroupName(jid, name)
+}
+
+// SetGroupTopic updates the topic of a WhatsApp group
+func (s *Session) SetGroupTopic(resourceID, topic string) error {
+	if s.client == nil || s.client.Store.ID == nil {
+		return fmt.Errorf("Cannot set group topic for unauthenticated session")
+	}
+
+	jid, err := types.ParseJID(resourceID)
+	if err != nil {
+		return fmt.Errorf("Could not parse JID for group topic change: %s", err)
+	}
+
+	return s.client.SetGroupTopic(jid, "", "", topic)
+}
+
 // FindContact attempts to check for a registered contact on WhatsApp corresponding to the given
 // phone number, returning a concrete instance if found; typically, only the contact JID is set. No
 // error is returned if no contact was found, but any unexpected errors will otherwise be returned