videoID validation and userID min length

src/utils/youtubeID.ts

@@ -0,0 +1,26 @@
+import { VideoID } from "../types/segments.model";
+
+const idRegex = new RegExp(/([0-9A-Za-z_-]{11})/); // group to always be index 1
+const exclusiveIdegex = new RegExp(`^${idRegex.source}$`);
+// match /c/, /channel/, /@channel, full UUIDs
+const negativeRegex = new RegExp(/(\/(channel|c)\/.+)|(\/@.+)|([a-f0-9]{64,65})|(youtube\.com\/clip\/)/);
+const urlRegex = new RegExp(`(?:v=|/|youtu.be/)${idRegex.source}(?:|/|[?&]t=\\d+s?)>?(?:\\s|$)`);
+const negateIdRegex = new RegExp(/(?:[^0-9A-Za-z_-]*?)/);
+const looseEndsRegex = new RegExp(`${negateIdRegex.source}${idRegex.source}${negateIdRegex.source}`);
+
+export const validate = (id: string): boolean => exclusiveIdegex.test(id);
+
+export const sanitize = (id: string): VideoID | null => {
+    // first decode URI
+    id = decodeURIComponent(id);
+    // strict matching
+    const strictMatch = id.match(exclusiveIdegex)?.[1];
+    const urlMatch = id.match(urlRegex)?.[1];
+    // return match, if not negative, return looseMatch
+    const looseMatch = id.match(looseEndsRegex)?.[1];
+    return strictMatch ? (strictMatch as VideoID)
+        : negativeRegex.test(id) ? null
+            : urlMatch ? (urlMatch as VideoID)
+                : looseMatch ? (looseMatch as VideoID)
+                    : null;
+};