Chat federation metadata fix, and code refactoring.

server/lib/uri/canonicalize.ts

@@ -0,0 +1,10 @@
+import type { RegisterServerOptions } from '@peertube/peertube-types'
+import * as url from 'url'
+
+export function fullUri (options: RegisterServerOptions, path: string): string {
+  if (path.startsWith('https://') || path.startsWith('http://')) {
+    return path
+  }
+  const uri = new url.URL(path, options.peertubeHelpers.config.getWebserverUrl())
+  return uri.toString()
+}