Fix session expiration handling

frontend/src/utils/session.js

@@ -0,0 +1,51 @@
+export const ACCESS_TOKEN_KEY = 'accessToken';
+export const SESSION_EXPIRED_MESSAGE = 'Tu sesión expiró. Vuelve a iniciar sesión.';
+export const SESSION_EXPIRED_EVENT = 'linkedsign:session-expired';
+
+export const getAccessToken = () => localStorage.getItem(ACCESS_TOKEN_KEY);
+
+export const setAccessToken = (token) => {
+  localStorage.setItem(ACCESS_TOKEN_KEY, token);
+};
+
+export const clearAccessToken = () => {
+  localStorage.removeItem(ACCESS_TOKEN_KEY);
+};
+
+export const getAccessTokenExpiryDelay = (token) => {
+  try {
+    const [, payload] = token.split('.');
+    const normalizedPayload = payload.replace(/-/g, '+').replace(/_/g, '/');
+    const paddedPayload = normalizedPayload.padEnd(
+      normalizedPayload.length + ((4 - (normalizedPayload.length % 4)) % 4),
+      '='
+    );
+    const decoded = JSON.parse(window.atob(paddedPayload));
+    if (!decoded.exp) return null;
+    return Math.max(decoded.exp * 1000 - Date.now(), 0);
+  } catch {
+    return null;
+  }
+};
+
+export const translateApiError = (error, fallback = 'Ocurrió un error. Intenta nuevamente.') => {
+  const code = error?.response?.data?.code;
+  const message = error?.response?.data?.error;
+
+  if (code === 'SESSION_EXPIRED' || /token|session|sesión/i.test(message || '')) {
+    return SESSION_EXPIRED_MESSAGE;
+  }
+
+  return message || fallback;
+};
+
+export const expireSession = ({ redirect = true } = {}) => {
+  clearAccessToken();
+  window.dispatchEvent(new CustomEvent(SESSION_EXPIRED_EVENT, {
+    detail: { message: SESSION_EXPIRED_MESSAGE },
+  }));
+
+  if (redirect && window.location.pathname !== '/login') {
+    window.location.replace('/login?sessionExpired=1');
+  }
+};