diff --git a/src/services/booksApi.ts b/src/services/booksApi.ts
index 046aaa5..51438d1 100644
--- a/src/services/booksApi.ts
+++ b/src/services/booksApi.ts
@@ -1,4 +1,5 @@
 import type { TeachingBook } from '../domain/teachingDesign'
+import { authedFetch } from '../composables/useAuth'
 
 export interface BookSummary {
   id: string
@@ -25,52 +26,34 @@ export interface GenerateResult {
   markdown: string
 }
 
-interface ErrorBody {
-  error?: string
-}
-
-async function request<T>(path: string, init?: RequestInit): Promise<T> {
-  const response = await fetch(path, {
-    ...init,
-    headers: { 'Content-Type': 'application/json', ...(init?.headers ?? {}) },
-  })
-
-  if (!response.ok) {
-    const body = (await response.json().catch(() => null)) as ErrorBody | null
-    throw new Error(body?.error ?? `请求失败（${response.status}）。`)
-  }
-
-  return response.json() as Promise<T>
-}
-
 export function listBooks(): Promise<BookSummary[]> {
-  return request('/api/books')
+  return authedFetch('/api/books')
 }
 
 export function createBook(name: string): Promise<BookRecord> {
-  return request('/api/books', { method: 'POST', body: JSON.stringify({ name }) })
+  return authedFetch('/api/books', { method: 'POST', body: JSON.stringify({ name }) })
 }
 
 export function getBook(id: string): Promise<BookRecord> {
-  return request(`/api/books/${id}`)
+  return authedFetch(`/api/books/${id}`)
 }
 
 export function updateBook(id: string, data: TeachingBook): Promise<BookMeta> {
-  return request(`/api/books/${id}`, { method: 'PUT', body: JSON.stringify({ data }) })
+  return authedFetch(`/api/books/${id}`, { method: 'PUT', body: JSON.stringify({ data }) })
 }
 
 export function renameBook(id: string, name: string): Promise<BookMeta> {
-  return request(`/api/books/${id}`, { method: 'PATCH', body: JSON.stringify({ name }) })
+  return authedFetch(`/api/books/${id}`, { method: 'PATCH', body: JSON.stringify({ name }) })
 }
 
 export function deleteBook(id: string): Promise<{ ok: true }> {
-  return request(`/api/books/${id}`, { method: 'DELETE' })
+  return authedFetch(`/api/books/${id}`, { method: 'DELETE' })
 }
 
 export function generateLesson(topic: string): Promise<GenerateResult> {
-  return request('/api/generate', { method: 'POST', body: JSON.stringify({ topic }) })
+  return authedFetch('/api/generate', { method: 'POST', body: JSON.stringify({ topic }) })
 }
 
 export function generateOutline(theme: string): Promise<{ titles: string[] }> {
-  return request('/api/generate/outline', { method: 'POST', body: JSON.stringify({ theme }) })
+  return authedFetch('/api/generate/outline', { method: 'POST', body: JSON.stringify({ theme }) })
 }