81 lines
2.6 KiB
JavaScript
81 lines
2.6 KiB
JavaScript
/* Brain of Reese — admin sign-in (phase 16, A10 revised).
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*
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* One admin, one password. On submit → POST /api/login: 204 sets the
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* signed session cookie and we redirect to `?next` (same-origin relative
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* URLs only — "/…" but never "//host" or an absolute URL; default
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* /sources.html). A 401 keeps the form and announces through the
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* role=alert error region. On load, /api/whoami already says admin →
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* straight to `next`, no form.
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*
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* No CDN, no state in this file: the signed cookie is the whole session.
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* All DOM ids match frontend/login.html.
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*/
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const form = document.querySelector("#login-form");
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const passwordInput = document.querySelector("#login-password");
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const submitBtn = document.querySelector("#login-submit");
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const errorEl = document.querySelector("#login-error");
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const DEFAULT_NEXT = "/sources.html";
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/* Same-origin relative URLs only: honor `?next=/…`, reject anything that
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would leave the origin (protocol-relative "//…" or absolute). */
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function safeNext() {
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const next = new URLSearchParams(window.location.search).get("next") || DEFAULT_NEXT;
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return next.startsWith("/") && !next.startsWith("//") ? next : DEFAULT_NEXT;
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}
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function showError(message) {
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errorEl.textContent = message;
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errorEl.hidden = false;
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submitBtn.disabled = false;
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passwordInput.focus();
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passwordInput.select();
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}
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async function alreadySignedIn() {
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try {
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const r = await fetch("/api/whoami");
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if (!r.ok) return false;
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return (await r.json()).authenticated === true;
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} catch {
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return false; // API unreachable: stay on the form — submit will explain
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}
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}
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form.addEventListener("submit", async (e) => {
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e.preventDefault();
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errorEl.hidden = true;
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errorEl.textContent = "";
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submitBtn.disabled = true;
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try {
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const r = await fetch("/api/login", {
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method: "POST",
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headers: { "Content-Type": "application/json" },
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body: JSON.stringify({ password: passwordInput.value }),
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});
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if (r.status === 204) {
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// Session cookie set — off to the requested page.
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window.location.replace(safeNext());
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return;
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}
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// One generic failure (401); anything else is a server-side surprise.
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const detail =
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r.status === 401
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? "Invalid password — try again."
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: `Sign-in failed (HTTP ${r.status}) — try again.`;
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showError(detail);
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} catch {
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showError("Could not reach the server — try again.");
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}
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});
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/* Already the admin? Skip the form and go straight to the target. */
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(async () => {
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if (await alreadySignedIn()) {
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window.location.replace(safeNext());
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return;
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}
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passwordInput.focus();
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})();
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