From cecd9038102d41faa33f670548dc211d0d45c96e Mon Sep 17 00:00:00 2001
From: Luca <Luca@hackerspace-bamberg.de>
Date: Mon, 25 Jul 2022 01:07:28 +0200
Subject: [PATCH] Add greeting when joining rooms

---
 internal/matrix/client.go | 77 ++++++++++++++++++++++++---------------
 1 file changed, 48 insertions(+), 29 deletions(-)

diff --git a/internal/matrix/client.go b/internal/matrix/client.go
index 8084fc7..a4fd52e 100644
--- a/internal/matrix/client.go
+++ b/internal/matrix/client.go
@@ -20,6 +20,7 @@ type Client struct {
 	config		*config.MatrixConfig
 	db		*sql.DB
 	deviceID	id.DeviceID
+	greetedRooms	[]id.RoomID
 	olmMachine	*crypto.OlmMachine
 	store		*sqlStore
 	syncer		*mautrix.DefaultSyncer
@@ -50,7 +51,7 @@ func NewClient(config *config.MatrixConfig, db *sql.DB) (*Client, error) {
 
 	deviceID := loadDeviceID(db, userID)
 
-	return &Client{client, config, db, deviceID, nil, store, syncer, userID}, nil
+	return &Client{client, config, db, deviceID, nil, nil, store, syncer, userID}, nil
 }
 
 func (c *Client) Login() error {
@@ -123,9 +124,39 @@ func (c *Client) Sync(ctx context.Context, wg *sync.WaitGroup) {
 	}
 }
 
-func (c *Client) Broadcast(message *event.MessageEventContent) {
+func (c *Client) Send(roomID id.RoomID, message *event.MessageEventContent) {
 	content := event.Content{Parsed: message}
 
+	if c.store.IsEncrypted(roomID) {
+		encrypted, err := c.olmMachine.EncryptMegolmEvent(roomID, event.EventMessage, &content)
+		if err == crypto.NoGroupSession || err == crypto.SessionExpired || err == crypto.SessionNotShared {
+			err = c.olmMachine.ShareGroupSession(roomID, c.store.GetRoomMembers(roomID))
+			if err != nil {
+				log.Print(err)
+				return
+			}
+
+			encrypted, err = c.olmMachine.EncryptMegolmEvent(roomID, event.EventMessage, &content)
+		}
+
+		if err != nil {
+			log.Print(err)
+			return
+		}
+
+		_, err = c.client.SendMessageEvent(roomID, event.EventEncrypted, encrypted)
+		if err != nil {
+			log.Print(err)
+		}
+	} else {
+		_, err := c.client.SendMessageEvent(roomID, event.EventMessage, &content)
+		if err != nil {
+			log.Print(err)
+		}
+	}
+}
+
+func (c *Client) Broadcast(message *event.MessageEventContent) {
 	for _, roomID := range c.store.FindAllSharedRooms(c.userID) {
 		allowed := false
 		for _, room := range c.config.AllowedRooms {
@@ -139,33 +170,7 @@ func (c *Client) Broadcast(message *event.MessageEventContent) {
 			continue
 		}
 
-		if c.store.IsEncrypted(roomID) {
-			encrypted, err := c.olmMachine.EncryptMegolmEvent(roomID, event.EventMessage, &content)
-			if err == crypto.NoGroupSession || err == crypto.SessionExpired || err == crypto.SessionNotShared {
-				err = c.olmMachine.ShareGroupSession(roomID, c.store.GetRoomMembers(roomID))
-				if err != nil {
-					log.Print(err)
-					continue
-				}
-
-				encrypted, err = c.olmMachine.EncryptMegolmEvent(roomID, event.EventMessage, &content)
-			}
-
-			if err != nil {
-				log.Print(err)
-				continue
-			}
-
-			_, err = c.client.SendMessageEvent(roomID, event.EventEncrypted, encrypted)
-			if err != nil {
-				log.Print(err)
-			}
-		} else {
-			_, err := c.client.SendMessageEvent(roomID, event.EventMessage, &content)
-			if err != nil {
-				log.Print(err)
-			}
-		}
+		c.Send(roomID, message)
 	}
 }
 
@@ -190,6 +195,20 @@ func (c *Client) handleMemberEvent(source mautrix.EventSource, evt *event.Event)
 			if err != nil {
 				log.Print(err)
 			}
+
+			for _, room := range c.greetedRooms {
+				if room == evt.RoomID {
+					return
+				}
+			}
+
+			message := event.MessageEventContent{
+				MsgType:	event.MsgText,
+				Body:		"Ich heiße Marvin \U0001f41e und werde ab jetzt neue Ticketbestellungen verkünden.",
+			}
+			c.Send(evt.RoomID, &message)
+
+			c.greetedRooms = append(c.greetedRooms, evt.RoomID)
 		} else {
 			_, err := c.client.LeaveRoom(evt.RoomID)
 			if err != nil {