feat(auth): support 2fa recovery code login in web auth panel

web/src/components/AuthPanel.tsx

@@ -14,6 +14,8 @@ export function AuthPanel() {
   const [username, setUsername] = useState("");
   const [password, setPassword] = useState("");
   const [otpCode, setOtpCode] = useState("");
+  const [recoveryCode, setRecoveryCode] = useState("");
+  const [useRecoveryCode, setUseRecoveryCode] = useState(false);
   const [checkingEmail, setCheckingEmail] = useState(false);
   const [error, setError] = useState<string | null>(null);
   const [success, setSuccess] = useState<string | null>(null);
@@ -52,13 +54,18 @@ export function AuthPanel() {
         return;
       }
 
-      await login(email, password, otpCode.trim() || undefined);
+      await login(
+        email,
+        password,
+        useRecoveryCode ? undefined : (otpCode.trim() || undefined),
+        useRecoveryCode ? (recoveryCode.trim() || undefined) : undefined
+      );
     } catch (err) {
       const message = getErrorMessage(err);
       if (step === "password" && message.toLowerCase().includes("2fa code required")) {
         setStep("otp");
         setError(null);
-        setSuccess("Enter 2FA code.");
+        setSuccess("Enter 2FA code or use a recovery code.");
         return;
       }
       setError(message);
@@ -70,6 +77,8 @@ export function AuthPanel() {
     setStep("email");
     setPassword("");
     setOtpCode("");
+    setRecoveryCode("");
+    setUseRecoveryCode(false);
     setName("");
     setUsername("");
     setError(null);
@@ -142,12 +151,30 @@ export function AuthPanel() {
         ) : null}
 
         {step === "otp" ? (
+          <>
+            <button
+              className="text-xs text-sky-300 hover:text-sky-200"
+              onClick={() => setUseRecoveryCode((v) => !v)}
+              type="button"
+            >
+              {useRecoveryCode ? "Use 2FA code instead" : "Use recovery code"}
+            </button>
+            {useRecoveryCode ? (
+              <input
+                className="w-full rounded bg-slate-800 px-3 py-2"
+                placeholder="Recovery code"
+                value={recoveryCode}
+                onChange={(e) => setRecoveryCode(e.target.value.toUpperCase().replace(/[^A-Z0-9-]/g, "").slice(0, 24))}
+              />
+            ) : (
               <input
                 className="w-full rounded bg-slate-800 px-3 py-2"
                 placeholder="2FA code"
                 value={otpCode}
                 onChange={(e) => setOtpCode(e.target.value.replace(/\D/g, "").slice(0, 8))}
               />
+            )}
+          </>
         ) : null}
 
         <button className="w-full rounded bg-accent px-3 py-2 font-semibold text-black disabled:opacity-50" disabled={isBusy} type="submit">

web/src/store/authStore.ts

@@ -8,7 +8,7 @@ interface AuthState {
   me: AuthUser | null;
   loading: boolean;
   setTokens: (accessToken: string, refreshToken: string) => void;
-  login: (email: string, password: string, otpCode?: string) => Promise<void>;
+  login: (email: string, password: string, otpCode?: string, recoveryCode?: string) => Promise<void>;
   loadMe: () => Promise<void>;
   refresh: () => Promise<void>;
   logout: () => void;
@@ -27,10 +27,10 @@ export const useAuthStore = create<AuthState>((set, get) => ({
     localStorage.setItem(REFRESH_KEY, refreshToken);
     set({ accessToken, refreshToken });
   },
-  login: async (email, password, otpCode) => {
+  login: async (email, password, otpCode, recoveryCode) => {
     set({ loading: true });
     try {
-      const data = await loginRequest(email, password, otpCode);
+      const data = await loginRequest(email, password, otpCode, recoveryCode);
       get().setTokens(data.access_token, data.refresh_token);
       await get().loadMe();
     } finally {