Builtin ConverseJS on external XMPP server: new placeholders for the room name: CHANNEL_ID, CHANNEL_NAME.

server/lib/database/channel.ts

@@ -0,0 +1,26 @@
+async function getChannelNameById (options: RegisterServerOptions, channelId: number): Promise<string | null> {
+  if (!channelId) {
+    throw new Error('Missing channelId')
+  }
+  if (!Number.isInteger(channelId)) {
+    throw new Error('Invalid channelId: not an integer')
+  }
+  const [results] = await options.peertubeHelpers.database.query(
+    'SELECT "actor"."preferredUsername"' +
+    ' FROM "videoChannel"' +
+    ' RIGHT JOIN "actor" ON "actor"."id" = "videoChannel"."actorId"' +
+    ' WHERE "videoChannel"."id" = ' + channelId.toString()
+  )
+  if (!Array.isArray(results)) {
+    throw new Error('getChannelNameById: query result is not an array.')
+  }
+  if (!results[0]) {
+    options.peertubeHelpers.logger.debug(`getChannelNameById: channel ${channelId} not found.`)
+    return null
+  }
+  return (results[0].preferredUsername ?? null) as string
+}
+
+export {
+  getChannelNameById
+}