verify redirects are safe before redirecting

src/lib/cleanRedirect.ts

@@ -0,0 +1,18 @@
+type PatternConfig = {
+    name: string;
+    regex: RegExp;
+};
+
+const patterns: PatternConfig[] = [
+    { name: "Invite Token", regex: /^\/invite\?token=[a-zA-Z0-9-]+$/ },
+    { name: "Setup", regex: /^\/setup$/ },
+    { name: "Resource Auth Portal", regex: /^\/auth\/resource\/\d+$/ }
+];
+
+export function cleanRedirect(input: string): string {
+    if (!input || typeof input !== "string") {
+        return "/";
+    }
+    const isAccepted = patterns.some((pattern) => pattern.regex.test(input));
+    return isAccepted ? input : "/";
+}