feat: Generalize and extend notification channel type behaviour

src/util/StringUtil.ts

@@ -28,3 +28,38 @@ export function sanitizeUrlPart(urlPart: string): string {
 export function isValidFileName(name: string): boolean {
   return /^[\w.-]+$/u.test(name);
 }
+
+/**
+ * Converts milliseconds to an ISO 8601 duration string.
+ * The only categories used are days, hours, minutes, and seconds,
+ * because months have no fixed size in milliseconds.
+ * @param ms - The duration in ms to convert.
+ */
+export function msToDuration(ms: number): string {
+  let totalSeconds = ms / 1000;
+  const days = Math.floor(totalSeconds / (60 * 60 * 24));
+  totalSeconds -= days * 60 * 60 * 24;
+  const hours = Math.floor(totalSeconds / (60 * 60));
+  totalSeconds -= hours * 60 * 60;
+  const minutes = Math.floor(totalSeconds / 60);
+  const seconds = totalSeconds - (minutes * 60);
+
+  const stringParts: string[] = [ 'P' ];
+  if (days > 0) {
+    stringParts.push(`${days}D`);
+  }
+  if (hours > 0 || minutes > 0 || seconds > 0) {
+    stringParts.push('T');
+  }
+  if (hours > 0) {
+    stringParts.push(`${hours}H`);
+  }
+  if (minutes > 0) {
+    stringParts.push(`${minutes}M`);
+  }
+  if (seconds > 0) {
+    stringParts.push(`${seconds}S`);
+  }
+
+  return stringParts.join('');
+}

src/util/Vocabularies.ts

@@ -200,10 +200,13 @@ export const NOTIFY = createVocabulary('http://www.w3.org/ns/solid/notifications
   'startAt',
   'state',
   'subscription',
+  'target',
+  'topic',
   'webhookAuth',
   'webid',
 
   'WebHookSubscription2021',
+  'WebSocketSubscription2021',
 );
 
 export const OIDC = createVocabulary('http://www.w3.org/ns/solid/oidc#',
@@ -276,7 +279,9 @@ export const VCARD = createVocabulary('http://www.w3.org/2006/vcard/ns#',
 
 export const XSD = createVocabulary('http://www.w3.org/2001/XMLSchema#',
   'dateTime',
+  'duration',
   'integer',
+  'string',
 );
 
 // Alias for commonly used types