From 60c6d4471de0d5de6c933cc461ec47ce6ac2fd90 Mon Sep 17 00:00:00 2001
From: Tulir Asokan <tulir@maunium.net>
Date: Mon, 4 May 2026 18:14:05 +0300
Subject: [PATCH] capabilities: advertise member event support

---
 pkg/connector/capabilities.go | 35 ++++++++++++++++++++++++-----------
 1 file changed, 24 insertions(+), 11 deletions(-)

diff --git a/pkg/connector/capabilities.go b/pkg/connector/capabilities.go
index c024a51e..07908e40 100644
--- a/pkg/connector/capabilities.go
+++ b/pkg/connector/capabilities.go
@@ -26,7 +26,6 @@ import (
 	"go.mau.fi/util/ptr"
 	"go.mau.fi/util/variationselector"
 	"maunium.net/go/mautrix/bridgev2"
-	"maunium.net/go/mautrix/bridgev2/database"
 	"maunium.net/go/mautrix/event"
 
 	"go.mau.fi/mautrix-telegram/pkg/connector/ids"
@@ -212,7 +211,7 @@ func makeTimerList() []jsontime.Milliseconds {
 var telegramTimers = makeTimerList()
 
 func (tc *TelegramClient) GetCapabilities(ctx context.Context, portal *bridgev2.Portal) *event.RoomFeatures {
-	baseID := "fi.mau.telegram.capabilities.2025_11_24"
+	baseID := "fi.mau.telegram.capabilities.2026_05_04"
 	feat := &event.RoomFeatures{
 		Formatting:          formattingCaps,
 		File:                fileCaps,
@@ -272,21 +271,35 @@ func (tc *TelegramClient) GetCapabilities(ctx context.Context, portal *bridgev2.
 		baseID += "+spaceroom"
 		feat = &event.RoomFeatures{}
 	}
-
-	switch portal.RoomType {
-	case database.RoomTypeDM:
+	switch peerType {
+	case ids.PeerTypeChat:
+		feat.ID += "minigroup"
+		feat.MemberActions = map[event.MemberAction]event.CapabilitySupportLevel{
+			event.MemberActionBan:    event.CapLevelFullySupported,
+			event.MemberActionInvite: event.CapLevelFullySupported,
+			event.MemberActionLeave:  event.CapLevelFullySupported,
+			// Note: unban and kick are not supported
+		}
+		// Minigroups can always be deleted
+		feat.DeleteChatForEveryone = true
+	case ids.PeerTypeChannel:
+		feat.MemberActions = map[event.MemberAction]event.CapabilitySupportLevel{
+			event.MemberActionBan:    event.CapLevelFullySupported,
+			event.MemberActionKick:   event.CapLevelFullySupported,
+			event.MemberActionInvite: event.CapLevelFullySupported,
+			event.MemberActionLeave:  event.CapLevelFullySupported,
+		}
+		// Group creators can delete the chat for everyone, unless it's a large channel
+		if portalMetadata.ParticipantsCount < 1000 || topicID > 0 {
+			feat.DeleteChatForEveryone = true
+		}
+	case ids.PeerTypeUser:
 		baseID += "+dm"
 		feat.DeleteChat = true
 		feat.DeleteChatForEveryone = true
 		feat.State = event.StateFeatureMap{
 			event.StateBeeperDisappearingTimer.Type: {Level: event.CapLevelFullySupported},
 		}
-	default:
-		// Group creators can delete the chat for everyone, unless it's a large channel
-		if peerType == ids.PeerTypeChat || portalMetadata.ParticipantsCount < 1000 || topicID > 0 {
-			baseID += "+deletablegroup"
-			feat.DeleteChatForEveryone = true
-		}
 	}
 
 	feat.ID = baseID