Chat can be enabled in video properties.

server/lib/custom-fields.ts

@@ -0,0 +1,63 @@
+async function initCustomFields (options: RegisterServerOptions): Promise<void> {
+  const registerHook = options.registerHook
+  const storageManager = options.storageManager
+  const logger = options.peertubeHelpers.logger
+
+  registerHook({
+    target: 'action:api.video.updated',
+    handler: async (params: any) => {
+      logger.debug('Saving a video, checking for custom fields')
+
+      const body: any = params.body
+      const video: MVideoThumbnail | undefined = params.video
+      if (!video || !video.id) {
+        return
+      }
+      if (!body.pluginData) return
+      const value = body.pluginData['livechat-active']
+      // NB: on Peertube 3.2.1, value is "true", "false", or "null", as strings.
+      if (value === true || value === 'true') {
+        logger.info(`Saving livechat-active=true for video ${video.id}`)
+        await storageManager.storeData(`livechat-active-${video.id}`, true)
+      } else if (value === false || value === 'false' || value === 'null') {
+        logger.info(`Saving livechat-active=false for video ${video.id}`)
+        await storageManager.storeData(`livechat-active-${video.id}`, false)
+      } else {
+        logger.error('Unknown value ' + JSON.stringify(value) + ' for livechat-active field.')
+      }
+    }
+  })
+
+  registerHook({
+    target: 'filter:api.video.get.result',
+    handler: async (video: MVideoThumbnail): Promise<MVideoThumbnail> => {
+      logger.debug('Getting a video, searching for custom fields')
+      await fillVideoCustomFields(options, video)
+      return video
+    }
+  })
+}
+
+async function fillVideoCustomFields (options: RegisterServerOptions, video: MVideoThumbnail): Promise<void> {
+  if (!video) return video
+  if (!video.pluginData) video.pluginData = {}
+  if (!video.id) return
+  const storageManager = options.storageManager
+  const logger = options.peertubeHelpers.logger
+
+  if (video.isLive) {
+    const result: any = await storageManager.getData(`livechat-active-${video.id}`)
+    logger.debug(`Video ${video.id} has livechat-active=` + JSON.stringify(result))
+    // NB: I got weird stuff here. Maybe Peertube 3.2.1 bug?
+    if (result === true || result === 'true') {
+      video.pluginData['livechat-active'] = true
+    } else if (result === false || result === 'false' || result === 'null') {
+      video.pluginData['livechat-active'] = false
+    }
+  }
+}
+
+export {
+  initCustomFields,
+  fillVideoCustomFields
+}