fix: 修复 fileid索引

lib/fileStorage.ts

@@ -1,5 +1,6 @@
 import * as Minio from 'minio'
 import { randomUUID } from 'crypto'
+import { Readable } from 'stream'
 import { minioClient, BUCKET_NAME, initializeMinIO } from './minioClient'
 
 export interface StoredFile {
@@ -20,6 +21,19 @@ export interface FileMetadata {
   objectName: string
 }
 
+export interface StoredFileStream {
+  stream: Readable
+  contentType: string
+  filename: string
+  size?: number
+}
+
+export interface StoredFileStreamMetadata {
+  contentType?: string | null
+  filename?: string | null
+  size?: number | null
+}
+
 // 生成对象名称，使用分层结构优化性能
 function generateObjectName(type: 'screenshot' | 'version' | 'other', hostname?: string): string {
   const now = new Date()
@@ -168,6 +182,27 @@ export async function getFileByObjectName(objectName: string): Promise<{ buffer:
   }
 }
 
+export async function getFileStreamByObjectName(
+  objectName: string,
+  metadata: StoredFileStreamMetadata = {}
+): Promise<StoredFileStream | null> {
+  try {
+    await ensureMinIOReady()
+
+    const stream = await minioClient.getObject(BUCKET_NAME, objectName)
+
+    return {
+      stream,
+      contentType: metadata.contentType || 'application/octet-stream',
+      filename: metadata.filename || objectName.split('/').pop() || 'unknown',
+      size: metadata.size ?? undefined
+    }
+  } catch (error) {
+    console.error('❌ 获取文件流失败:', error)
+    return null
+  }
+}
+
 export async function deleteFile(objectName: string): Promise<boolean> {
   try {
     await ensureMinIOReady()