fix: handle registration keys on headscale 0.29+

Closes HP-555.

app/utils/register-key.ts

@@ -0,0 +1,46 @@
+const authRequestKeyPattern = /^hskey-authreq-[A-Za-z0-9_-]{16,}$/;
+const authRequestKeySearchPattern = /hskey-authreq-[A-Za-z0-9_-]{16,}/;
+const legacyMachineKeyPattern = /^mkey:[A-Za-z0-9_-]{16,}$/;
+const registerUrlPattern = /\/register\/([^\s?#]+)/;
+const registrationKeySuffixPattern = /^[A-Za-z0-9_-]{24,}$/;
+
+export function normalizeRegistrationKey(value: string): string | null {
+  const trimmed = value.trim();
+  if (trimmed.length === 0) {
+    return null;
+  }
+
+  const registerUrlMatch = trimmed.match(registerUrlPattern);
+  if (registerUrlMatch) {
+    const token = normalizeRegistrationToken(registerUrlMatch[1]);
+    if (token) {
+      return token;
+    }
+  }
+
+  const authRequestKeyMatch = trimmed.match(authRequestKeySearchPattern);
+  if (authRequestKeyMatch) {
+    return authRequestKeyMatch[0];
+  }
+
+  return normalizeRegistrationToken(trimmed);
+}
+
+function normalizeRegistrationToken(value: string): string | null {
+  let token: string;
+  try {
+    token = decodeURIComponent(value.trim());
+  } catch {
+    return null;
+  }
+
+  if (authRequestKeyPattern.test(token) || legacyMachineKeyPattern.test(token)) {
+    return token;
+  }
+
+  if (registrationKeySuffixPattern.test(token)) {
+    return `hskey-authreq-${token}`;
+  }
+
+  return null;
+}