feat(release): publish minimal self-contained Magent source

frontend/app/lib/auth.ts

@@ -0,0 +1,100 @@
+const AUTH_STATE_COOKIE = "magent_logged_in";
+
+export const getApiBase = () => process.env.NEXT_PUBLIC_API_BASE ?? "/api";
+
+const setCookie = (name: string, value: string, maxAgeSeconds: number) => {
+  if (typeof document === "undefined") return;
+  document.cookie = `${name}=${value}; Max-Age=${maxAgeSeconds}; Path=/; SameSite=Lax`;
+};
+
+const clearCookie = (name: string) => {
+  if (typeof document === "undefined") return;
+  document.cookie = `${name}=; Max-Age=0; Path=/; SameSite=Lax`;
+};
+
+export const getToken = () => {
+  if (typeof document === "undefined") return null;
+  const cookies = document.cookie.split(";").map((entry) => entry.trim());
+  const marker = cookies.find((entry) => entry.startsWith(`${AUTH_STATE_COOKIE}=`));
+  if (!marker) return null;
+  const [, value] = marker.split("=", 2);
+  return value || null;
+};
+
+export const setToken = (_token: string) => {
+  setCookie(AUTH_STATE_COOKIE, "1", 60 * 60 * 12);
+};
+
+export const clearToken = () => {
+  clearCookie(AUTH_STATE_COOKIE);
+  if (typeof window === "undefined") return;
+  const baseUrl = getApiBase();
+  void fetch(`${baseUrl}/auth/logout`, {
+    method: "POST",
+    credentials: "include",
+    keepalive: true,
+  }).catch(() => undefined);
+};
+
+export const logout = async () => {
+  const baseUrl = getApiBase();
+  clearCookie(AUTH_STATE_COOKIE);
+  await fetch(`${baseUrl}/auth/logout`, {
+    method: "POST",
+    credentials: "include",
+  });
+};
+
+export const authFetch = (input: RequestInfo | URL, init?: RequestInit) => {
+  const headers = new Headers(init?.headers || {});
+  return fetch(input, { ...init, headers, credentials: "include" });
+};
+
+export const getEventStreamToken = async () => {
+  const baseUrl = getApiBase();
+  const response = await authFetch(`${baseUrl}/auth/stream-token`);
+  if (!response.ok) {
+    const text = await response.text();
+    throw new Error(text || `Stream token request failed: ${response.status}`);
+  }
+  const data = await response.json();
+  const token = typeof data?.stream_token === "string" ? data.stream_token : "";
+  if (!token) {
+    throw new Error("Stream token not returned");
+  }
+  return token;
+};
+
+export class UnauthorizedError extends Error {
+  constructor() {
+    super("Unauthorized");
+    this.name = "UnauthorizedError";
+  }
+}
+
+export class ForbiddenError extends Error {
+  constructor() {
+    super("Forbidden");
+    this.name = "ForbiddenError";
+  }
+}
+
+export const authFetchOrThrow = async (input: RequestInfo | URL, init?: RequestInit) => {
+  const response = await authFetch(input, init);
+  if (response.status === 401) {
+    clearToken();
+    throw new UnauthorizedError();
+  }
+  if (response.status === 403) {
+    throw new ForbiddenError();
+  }
+  return response;
+};
+
+export const readResponseText = async (response: Response) => {
+  try {
+    return (await response.text()).trim();
+  } catch {
+    return "";
+  }
+};