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calcom/packages/emails/lib/getICalUID.ts

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+import short from "short-uuid";
+import { v4 as uuidv4 } from "uuid";
+
+import { APP_NAME } from "@calcom/lib/constants";
+
+/**
+ * This function returns the iCalUID if a uid is passed or if it is present in the event that is passed
+ * @param uid - the uid of the event
+ * @param event - an event that already has an iCalUID or one that has a uid
+ * @param defaultToEventUid - if true, will default to the event.uid if present
+ *
+ * @returns the iCalUID whether already present or generated
+ */
+const getICalUID = ({
+  uid,
+  event,
+  defaultToEventUid,
+  attendeeId,
+}: {
+  uid?: string;
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  event?: { iCalUID?: string | null; uid?: string | null; [key: string]: any };
+  defaultToEventUid?: boolean;
+  attendeeId?: number;
+}) => {
+  if (event?.iCalUID) return event.iCalUID;
+
+  if (defaultToEventUid && event?.uid) return `${event.uid}@${APP_NAME}`;
+
+  if (uid) return `${uid}@${APP_NAME}`;
+
+  const translator = short();
+
+  uid = translator.fromUUID(uuidv4());
+  return `${uid}${attendeeId ? `${attendeeId}` : ""}@${APP_NAME}`;
+};
+
+export default getICalUID;