[APP-1784] Proper fix for Live Now status not showing (#9779)

* Be sure to validate if actor is allowed to be live on certain domain

* Rename for clarity

* Memoize

src/lib/actor-status.ts

@@ -3,6 +3,7 @@ import {
   type $Typed,
   type AppBskyActorDefs,
   AppBskyEmbedExternal,
+  AtUri,
 } from '@atproto/api'
 import {isAfter, parseISO} from 'date-fns'
 
@@ -73,10 +74,15 @@ export function isStatusValidForViewers(
   config: LiveNowConfig,
 ) {
   if (status.status !== 'app.bsky.actor.status#live') return false
+  if (!status.uri) return false // should not happen, just backwards compat
   try {
+    const {host: liveDid} = new AtUri(status.uri)
     if (AppBskyEmbedExternal.isView(status.embed)) {
       const url = new URL(status.embed.external.uri)
-      return config.allSupportedDomains.has(url.hostname)
+      const exception = config.allowedHostsExceptionsByDid.get(liveDid)
+      const isValidException = exception ? exception.has(url.hostname) : false
+      const isValidForAnyone = config.defaultAllowedHosts.has(url.hostname)
+      return isValidException || isValidForAnyone
     } else {
       return false
     }