add view de

management/src/api.ts

@@ -694,6 +694,13 @@ export interface ExamSubmission {
   gitPublishUrl?: string;
 }
 
+function decodeBase64ToArrayBuffer(b64: string): ArrayBuffer {
+  const bin = atob(b64);
+  const out = new Uint8Array(bin.length);
+  for (let i = 0; i < bin.length; i++) out[i] = bin.charCodeAt(i);
+  return out.buffer;
+}
+
 export const apiExam = {
   list: async (): Promise<{ data: ExamRoomItem[] }> => {
     const res = await staffFetch('/exam-rooms');
@@ -798,6 +805,38 @@ export const apiExam = {
     if (!res.ok) await parseError(res, 'Xóa gói đề thất bại');
     return res.json();
   },
+  fetchPaperPdfBytes: async (examId: number, paperId: number): Promise<ArrayBuffer> => {
+    const res = await staffFetch(`/exam-rooms/${examId}/papers/${paperId}/view`);
+    if (!res.ok) await parseError(res, 'Không mở được đề PDF');
+    const json = await res.json() as { data: string };
+    if (!json.data) throw new Error('Server không trả dữ liệu PDF');
+    return decodeBase64ToArrayBuffer(json.data);
+  },
+  fetchPaperResourceBytes: async (examId: number, paperId: number, resourceId: number): Promise<ArrayBuffer> => {
+    const res = await staffFetch(`/exam-rooms/${examId}/papers/${paperId}/resources/${resourceId}/view`);
+    if (!res.ok) await parseError(res, 'Không tải tài nguyên');
+    const json = await res.json() as { data: string };
+    if (!json.data) throw new Error('Server không trả dữ liệu file');
+    return decodeBase64ToArrayBuffer(json.data);
+  },
+  downloadPaperFile: async (examId: number, paperId: number, opts?: { resourceId?: number; fileName?: string }) => {
+    const params = new URLSearchParams();
+    if (opts?.resourceId) {
+      params.set('kind', 'resource');
+      params.set('fileId', String(opts.resourceId));
+    } else {
+      params.set('kind', 'pdf');
+    }
+    const res = await staffFetch(`/exam-rooms/${examId}/papers/${paperId}/download?${params}`);
+    if (!res.ok) await parseError(res, 'Tải file thất bại');
+    const buf = await res.arrayBuffer();
+    const url = URL.createObjectURL(new Blob([buf]));
+    const a = document.createElement('a');
+    a.href = url;
+    a.download = opts?.fileName || 'de-thi.pdf';
+    a.click();
+    URL.revokeObjectURL(url);
+  },
   assignRandom: async (id: number) => {
     const res = await staffFetch(`/exam-rooms/${id}/assign-random`, { method: 'POST' });
     if (!res.ok) await parseError(res, 'Chia gói đề thất bại');