From 584312f30805680711557ff6fbe291d2404367fb Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex@adnab.me>
Date: Mon, 17 Feb 2020 15:30:01 +0100
Subject: Correctly update room topics (works on irc)

---
 appservice/account.go | 18 +++++++++++++++++-
 appservice/matrix.go  | 38 +++++++++++++++++++++++++++++++-------
 appservice/server.go  |  9 +++++++++
 3 files changed, 57 insertions(+), 8 deletions(-)

(limited to 'appservice')

diff --git a/appservice/account.go b/appservice/account.go
index faf491d..ae9716f 100644
--- a/appservice/account.go
+++ b/appservice/account.go
@@ -92,7 +92,23 @@ func (a *Account) UserInfoUpdated(user UserID, info *UserInfo) {
 	// TODO
 }
 
-func (a *Account) RoomInfoUpdated(roomId RoomID, info *RoomInfo) {
+func (a *Account) RoomInfoUpdated(roomId RoomID, author UserID, info *RoomInfo) {
+	mx_room_id, err := dbGetMxRoom(a.Protocol, roomId)
+	if err != nil {
+		return
+	}
+
+	as_mxid := fmt.Sprintf("@%s:%s", registration.SenderLocalpart, config.MatrixDomain)
+	if len(author) > 0 {
+		mx_user_id, err := dbGetMxUser(a.Protocol, author)
+		if err == nil {
+			as_mxid = mx_user_id
+		}
+	}
+
+	if info.Topic != "" {
+		mxRoomTopicAs(mx_room_id, info.Topic, as_mxid)
+	}
 	// TODO
 }
 
diff --git a/appservice/matrix.go b/appservice/matrix.go
index 88c4b5d..75bcaa1 100644
--- a/appservice/matrix.go
+++ b/appservice/matrix.go
@@ -138,6 +138,10 @@ func mxCreateRoom(name string, alias string, invite []string) (string, error) {
 		},
 		PowerLevels: map[string]interface{} {
 			"invite": 100,
+			"events": map[string]interface{} {
+				"m.room.topic": 0,
+				"m.room.avatar": 0,
+			},
 		},
 	}
 	var rep CreateRoomResponse
@@ -203,16 +207,36 @@ func mxRoomLeaveAs(room string, user string) error {
 	return err
 }
 
-func mxSendMessageAs(room string, typ string, body string, user string) error {
+func mxSendAs(room string, event_type string, content map[string]interface{}, user string) error {
 	txn_id := time.Now().UnixNano()
-	rq := RoomSendMessageRequest{
-		MsgType: typ,
-		Body: body,
+	var rep RoomSendResponse
+	err := mxPutApiCall(fmt.Sprintf(
+		"/_matrix/client/r0/rooms/%s/send/%s/%d?user_id=%s",
+		url.QueryEscape(room), event_type, txn_id, url.QueryEscape(user)),
+		&content, &rep)
+	return err
+}
+
+func mxSendMessageAs(room string, typ string, body string, user string) error {
+	content := map[string]interface{} {
+		"msgtype": typ,
+		"body": body,
 	}
+	return mxSendAs(room, "m.room.message", content, user)
+}
+
+func mxPutStateAs(room string, event_type string, key string, content map[string]interface{}, as_user string) error {
 	var rep RoomSendResponse
 	err := mxPutApiCall(fmt.Sprintf(
-		"/_matrix/client/r0/rooms/%s/send/m.room.message/%d?user_id=%s",
-		url.QueryEscape(room), txn_id, url.QueryEscape(user)),
-		&rq, &rep)
+		"/_matrix/client/r0/rooms/%s/state/%s/%s?user_id=%s",
+		url.QueryEscape(room), event_type, key, url.QueryEscape(as_user)),
+		&content, &rep)
 	return err
 }
+
+func mxRoomTopicAs(room string, topic string, as_user string) error {
+	content := map[string]interface{} {
+		"topic": topic,
+	}
+	return mxPutStateAs(room, "m.room.topic", "", content, as_user)
+}
diff --git a/appservice/server.go b/appservice/server.go
index 00f23f1..2690e58 100644
--- a/appservice/server.go
+++ b/appservice/server.go
@@ -144,5 +144,14 @@ func handleTxnEvent(e *mxlib.Event) {
 				}
 			}
 		}
+	} else if e.Type == "m.room.topic" {
+		if room := dbIsPublicRoom(e.RoomId); room != nil {
+			acct := FindJoinedAccount(e.Sender, room.Protocol, room.RoomID)
+			if acct != nil {
+				acct.Conn.SetRoomInfo(room.RoomID, &connector.RoomInfo{
+					Topic: e.Content["topic"].(string),
+				})
+			}
+		}
 	}
 }
-- 
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