feat: 支持批量上传关卡

lib/cos-client.ts

@@ -0,0 +1,81 @@
+import COS from 'cos-js-sdk-v5'
+import { apiFetch } from '@/lib/api'
+
+interface TempKeyResponse {
+  credentials: {
+    tmpSecretId: string
+    tmpSecretKey: string
+    sessionToken: string
+  }
+  startTime: number
+  expiredTime: number
+  bucket: string
+  region: string
+}
+
+let cachedKey: TempKeyResponse | null = null
+
+async function getTempKey(forceRefresh = false): Promise<TempKeyResponse> {
+  const now = Math.floor(Date.now() / 1000)
+  // 提前 60 秒失效，避免边界问题
+  if (!forceRefresh && cachedKey && cachedKey.expiredTime - 60 > now) {
+    return cachedKey
+  }
+  const res = await apiFetch('/api/cos/temp-key')
+  if (!res.ok) {
+    throw new Error('获取上传凭证失败')
+  }
+  const data = (await res.json()) as TempKeyResponse
+  cachedKey = data
+  return data
+}
+
+function buildCosClient(key: TempKeyResponse): COS {
+  return new COS({
+    getAuthorization: (_options, callback) => {
+      callback({
+        TmpSecretId: key.credentials.tmpSecretId,
+        TmpSecretKey: key.credentials.tmpSecretKey,
+        SecurityToken: key.credentials.sessionToken,
+        StartTime: key.startTime,
+        ExpiredTime: key.expiredTime,
+      })
+    },
+  })
+}
+
+function randomFilename(originalName: string): string {
+  const ext = originalName.split('.').pop() || 'jpg'
+  const timestamp = Date.now()
+  const randomStr = Math.random().toString(36).substring(2, 8)
+  return `mini_game/images/${timestamp}_${randomStr}.${ext}`
+}
+
+/**
+ * 上传单个文件到腾讯云 COS，返回可访问的 URL。
+ */
+export async function uploadToCos(file: File | Blob, originalName?: string): Promise<string> {
+  const name = originalName || (file as File).name || 'upload.jpg'
+  const key = await getTempKey()
+  const cos = buildCosClient(key)
+  const filename = randomFilename(name)
+
+  return new Promise<string>((resolve, reject) => {
+    cos.putObject(
+      {
+        Bucket: key.bucket,
+        Region: key.region,
+        Key: filename,
+        Body: file as File,
+      },
+      (err) => {
+        if (err) {
+          reject(new Error(err.message || '上传失败'))
+          return
+        }
+        const url = `https://${key.bucket}.cos.${key.region}.myqcloud.com/${filename}`
+        resolve(url)
+      }
+    )
+  })
+}