Update prefix_webhook_messages option to use MSC4144 fallbacks

example-config.yaml

@@ -91,7 +91,7 @@ bridge:
     #   .System - Whether the user is an official system user
     #   .Webhook - Whether the user is a webhook and is not an application
     #   .Application - Whether the user is an application
-    displayname_template: '{{or .GlobalName .Username}}{{if .Bot}} (bot){{end}}'
+    displayname_template: '{{if .Webhook}}Webhook{{else}}{{or .GlobalName .Username}}{{if .Bot}} (bot){{end}}{{end}}'
     # Displayname template for Discord channels (bridged as rooms, or spaces when type=4).
     # Available variables:
     #   .Name - Channel name, or user displayname (pre-formatted with displayname_template) in DMs.
@@ -161,9 +161,12 @@ bridge:
     federate_rooms: true
     # Prefix messages from webhooks with the profile info? This can be used along with a custom displayname_template
     # to better handle webhooks that change their name all the time (like ones used by bridges).
-    prefix_webhook_messages: false
+    #
+    # This will use the fallback mode in MSC4144, which means clients that support MSC4144 will not show the prefix
+    # (and will instead show the name and avatar as the message sender).
+    prefix_webhook_messages: true
     # Bridge webhook avatars?
-    enable_webhook_avatars: true
+    enable_webhook_avatars: false
     # Should the bridge upload media to the Discord CDN directly before sending the message when using a user token,
     # like the official client does? The other option is sending the media in the message send request as a form part
     # (which is always used by bots and webhooks).

portal_convert.go

@@ -403,10 +403,20 @@ func (puppet *Puppet) addWebhookMeta(part *ConvertedMessage, msg *discordgo.Mess
 		"avatar_mxc": avatarURL.String(),
 	}
 	profileID := sha256.Sum256(fmt.Appendf(nil, "%s:%s", msg.Author.Username, msg.Author.Avatar))
+	hasFallback := false
+	if msg.ApplicationID == "" &&
+		puppet.bridge.Config.Bridge.PrefixWebhookMessages &&
+		(part.Content.MsgType == event.MsgText || part.Content.MsgType == event.MsgNotice || (part.Content.FileName != "" && part.Content.FileName != part.Content.Body)) {
+		part.Content.EnsureHasHTML()
+		part.Content.Body = fmt.Sprintf("%s: %s", msg.Author.Username, part.Content.Body)
+		part.Content.FormattedBody = fmt.Sprintf("<strong data-mx-profile-fallback>%s: </strong>%s", html.EscapeString(msg.Author.Username), part.Content.FormattedBody)
+		hasFallback = true
+	}
 	part.Extra["com.beeper.per_message_profile"] = map[string]any{
 		"id":           hex.EncodeToString(profileID[:]),
 		"avatar_url":   avatarURL.String(),
 		"displayname":  msg.Author.Username,
+		"has_fallback": hasFallback,
 	}
 }
 
@@ -765,11 +775,5 @@ func (portal *Portal) convertDiscordTextMessage(ctx context.Context, intent *app
 		"com.beeper.linkpreviews": previews,
 	}
 
-	if msg.WebhookID != "" && msg.ApplicationID == "" && portal.bridge.Config.Bridge.PrefixWebhookMessages {
-		content.EnsureHasHTML()
-		content.Body = fmt.Sprintf("%s: %s", msg.Author.Username, content.Body)
-		content.FormattedBody = fmt.Sprintf("<strong>%s</strong>: %s", html.EscapeString(msg.Author.Username), content.FormattedBody)
-	}
-
 	return &ConvertedMessage{Type: event.EventMessage, Content: &content, Extra: extraContent}
 }