feat:前端

frontend/lib/api.ts

@@ -0,0 +1,60 @@
+const API_BASE_URL =
+  process.env.NEXT_PUBLIC_API_BASE_URL ?? "/backend";
+
+export class ApiError extends Error {
+  status: number;
+  code: number | string | undefined;
+
+  constructor(message: string, status: number, code?: number | string) {
+    super(message);
+    this.name = "ApiError";
+    this.status = status;
+    this.code = code;
+  }
+}
+
+export async function apiFetch<T>(path: string, init: RequestInit = {}): Promise<T> {
+  const token = typeof window === "undefined" ? null : localStorage.getItem("huaxia_token");
+  const headers = new Headers(init.headers);
+  headers.set("Content-Type", "application/json");
+  if (token) headers.set("Authorization", `Bearer ${token}`);
+
+  const response = await fetch(`${API_BASE_URL}${path}`, {
+    ...init,
+    headers,
+    cache: "no-store",
+  });
+
+  const payload = await response.json().catch(() => null);
+  if (response.status === 401 && typeof window !== "undefined") {
+    localStorage.removeItem("huaxia_token");
+    if (!window.location.pathname.startsWith("/login")) window.location.href = "/login";
+  }
+  if (!response.ok || (payload && payload.code !== 200)) {
+    throw new ApiError(
+      payload?.message ?? "请求失败，请稍后重试",
+      response.status,
+      payload?.code
+    );
+  }
+
+  return (payload?.data ?? payload) as T;
+}
+
+export async function apiStream(path: string, body: unknown): Promise<string> {
+  const token = typeof window === "undefined" ? null : localStorage.getItem("huaxia_token");
+  const headers = new Headers({ "Content-Type": "application/json", Accept: "text/event-stream" });
+  if (token) headers.set("Authorization", `Bearer ${token}`);
+  const response = await fetch(`${API_BASE_URL}${path}`, {
+    method: "POST",
+    headers,
+    body: JSON.stringify(body),
+    cache: "no-store",
+  });
+  if (!response.ok) throw new ApiError("请求失败，请稍后重试", response.status);
+  const text = await response.text();
+  const event = text.split("\n").find((line) => line.startsWith("data:"));
+  if (!event) return text;
+  const payload = JSON.parse(event.slice(5).trim()) as { content?: string; answer?: string; message?: string };
+  return payload.content ?? payload.answer ?? payload.message ?? text;
+}