From 7a726e36a0f8f705c12ebe390cd65da7f65cc51a Mon Sep 17 00:00:00 2001
From: Tulir Asokan <tulir@maunium.net>
Date: Tue, 2 Sep 2025 20:14:52 +0300
Subject: [PATCH] startchat: update group creation interface

---
 go.mod                        |  2 +-
 go.sum                        |  4 ++--
 pkg/connector/capabilities.go | 21 +++++++++++++++++++++
 pkg/connector/startnewchat.go | 35 +++++++++++++++++++++++++----------
 4 files changed, 49 insertions(+), 13 deletions(-)

diff --git a/go.mod b/go.mod
index de3d5c8c..4858418c 100644
--- a/go.mod
+++ b/go.mod
@@ -36,7 +36,7 @@ require (
 	golang.org/x/sync v0.16.0
 	golang.org/x/tools v0.36.0
 	gopkg.in/yaml.v3 v3.0.1
-	maunium.net/go/mautrix v0.25.1-0.20250826140716-0345a5356de1
+	maunium.net/go/mautrix v0.25.1-0.20250902152424-709f48f2b370
 	rsc.io/qr v0.2.0
 )
 
diff --git a/go.sum b/go.sum
index 5614096a..ee37062e 100644
--- a/go.sum
+++ b/go.sum
@@ -193,7 +193,7 @@ gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 maunium.net/go/mauflag v1.0.0 h1:YiaRc0tEI3toYtJMRIfjP+jklH45uDHtT80nUamyD4M=
 maunium.net/go/mauflag v1.0.0/go.mod h1:nLivPOpTpHnpzEh8jEdSL9UqO9+/KBJFmNRlwKfkPeA=
-maunium.net/go/mautrix v0.25.1-0.20250826140716-0345a5356de1 h1:8U8dwv4dxhMLrtqjf9LoDuQ6daGj9qdw1/62HIvK2cY=
-maunium.net/go/mautrix v0.25.1-0.20250826140716-0345a5356de1/go.mod h1:pDd6Ppg+1PbWrw/rg4ZQQfVYZICRGzH+DcliZ/BODvU=
+maunium.net/go/mautrix v0.25.1-0.20250902152424-709f48f2b370 h1:1rz6V3P38i2qSJKEe0QBXozfI/9yaM/zWrZPDrtKVYQ=
+maunium.net/go/mautrix v0.25.1-0.20250902152424-709f48f2b370/go.mod h1:pDd6Ppg+1PbWrw/rg4ZQQfVYZICRGzH+DcliZ/BODvU=
 rsc.io/qr v0.2.0 h1:6vBLea5/NRMVTz8V66gipeLycZMl/+UlFmk8DvqQ6WY=
 rsc.io/qr v0.2.0/go.mod h1:IF+uZjkb9fqyeF/4tlBoynqmQxUoPfWEKh921coOuXs=
diff --git a/pkg/connector/capabilities.go b/pkg/connector/capabilities.go
index fd0ed654..f25fa883 100644
--- a/pkg/connector/capabilities.go
+++ b/pkg/connector/capabilities.go
@@ -32,6 +32,27 @@ import (
 func (tg *TelegramConnector) GetCapabilities() *bridgev2.NetworkGeneralCapabilities {
 	return &bridgev2.NetworkGeneralCapabilities{
 		DisappearingMessages: true,
+		Provisioning: bridgev2.ProvisioningCapabilities{
+			ResolveIdentifier: bridgev2.ResolveIdentifierCapabilities{
+				CreateDM:       true,
+				LookupPhone:    true,
+				LookupUsername: true,
+				ContactList:    true,
+				Search:         true,
+			},
+			GroupCreation: map[string]bridgev2.GroupTypeCapabilities{
+				"minigroup": {
+					TypeDescription: "a normal group",
+					Name:            bridgev2.GroupFieldCapability{Allowed: true, Required: true, MaxLength: 255},
+					Participants:    bridgev2.GroupFieldCapability{Allowed: true, Required: true, MinLength: 1, MaxLength: 200},
+					// TODO implement
+					//Disappear:       bridgev2.GroupFieldCapability{Allowed: true},
+				},
+				// TODO
+				//"channel": {},
+				//"supergroup": {},
+			},
+		},
 	}
 }
 
diff --git a/pkg/connector/startnewchat.go b/pkg/connector/startnewchat.go
index d2dd50ee..781e3bf3 100644
--- a/pkg/connector/startnewchat.go
+++ b/pkg/connector/startnewchat.go
@@ -24,8 +24,8 @@ import (
 	"strings"
 
 	"github.com/rs/zerolog"
+	"go.mau.fi/util/ptr"
 	"maunium.net/go/mautrix/bridgev2"
-	"maunium.net/go/mautrix/bridgev2/networkid"
 
 	"go.mau.fi/mautrix-telegram/pkg/gotd/telegram/query/hasher"
 	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
@@ -224,16 +224,11 @@ func (t *TelegramClient) GetContactList(ctx context.Context) (resp []*bridgev2.R
 }
 
 // TODO support channels
-func (t *TelegramClient) CreateGroup(ctx context.Context, name string, users ...networkid.UserID) (*bridgev2.CreateChatResponse, error) {
-	if len(users) == 0 {
-		return nil, fmt.Errorf("no users provided")
-	} else if len(users) > 200 {
-		return nil, fmt.Errorf("too many users provided: %d (max 200)", len(users))
-	}
+func (t *TelegramClient) CreateGroup(ctx context.Context, params *bridgev2.GroupCreateParams) (*bridgev2.CreateChatResponse, error) {
 	req := tg.MessagesCreateChatRequest{
-		Title: name,
+		Title: ptr.Val(params.Name).Name,
 	}
-	for _, networkUserID := range users {
+	for _, networkUserID := range params.Participants {
 		if peerType, userID, err := ids.ParseUserID(networkUserID); err != nil {
 			return nil, fmt.Errorf("failed to parse user ID: %w", err)
 		} else if peerType != ids.PeerTypeUser {
@@ -262,8 +257,28 @@ func (t *TelegramClient) CreateGroup(ctx context.Context, name string, users ...
 	} else if chat, ok := chats[0].(*tg.Chat); !ok {
 		return nil, fmt.Errorf("unexpected chat type: %T", chats[0])
 	} else {
+		portalKey := t.makePortalKeyFromID(ids.PeerTypeChat, chat.ID)
+		if params.RoomID != "" {
+			portal, err := t.main.Bridge.GetPortalByKey(ctx, portalKey)
+			if err != nil {
+				return nil, err
+			}
+			err = portal.UpdateMatrixRoomID(ctx, params.RoomID, bridgev2.UpdateMatrixRoomIDParams{
+				SyncDBMetadata: func() {
+					portal.Name = req.Title
+					portal.NameSet = true
+				},
+				OverwriteOldPortal: true,
+				TombstoneOldRoom:   true,
+				DeleteOldRoom:      true,
+				ChatInfoSource:     t.userLogin,
+			})
+			if err != nil {
+				return nil, err
+			}
+		}
 		return &bridgev2.CreateChatResponse{
-			PortalKey: t.makePortalKeyFromID(ids.PeerTypeChat, chat.ID),
+			PortalKey: portalKey,
 		}, nil
 	}
 }