update

app/api/endpoints/upload.py

@@ -2,7 +2,7 @@ from fastapi import APIRouter, UploadFile, File, Depends
 from typing import List
 import uuid
 from datetime import datetime
-from app.core.cos import cos_client
+from app.core.cos import cos_manager
 from app.core.config import settings
 from app.models.upload import UploadResponse, MultiUploadResponse
 from app.core.response import success_response, error_response, ResponseModel
@@ -18,7 +18,7 @@ async def upload_to_cos(file: UploadFile) -> str:
     filename = f"{datetime.now().strftime('%Y%m%d')}/{uuid.uuid4()}.{ext}"
     
     # 上传文件
-    cos_client.put_object(
+    cos_manager.put_object(
         Bucket=settings.COS_BUCKET,
         Body=await file.read(),
         Key=filename,
@@ -62,4 +62,20 @@ async def upload_images(
             urls.append(url)
         return success_response(data=MultiUploadResponse(urls=urls))
     except Exception as e:
-        return error_response(code=500, message=f"上传失败: {str(e)}") 
+        return error_response(code=500, message=f"上传失败: {str(e)}")
+
+@router.get("/presigned-url")
+async def get_presigned_url(
+    filename: str,
+    current_user: UserDB = Depends(get_current_user)
+):
+    """获取预签名上传URL"""
+    key = f"uploads/{current_user.userid}/{filename}"
+    try:
+        url = cos_manager.get_upload_url(key)
+        return success_response(data={
+            "url": url,
+            "key": key
+        })
+    except Exception as e:
+        return error_response(code=500, message=f"获取上传URL失败: {str(e)}") 

app/core/cos.py

@@ -6,10 +6,64 @@ import logging
 # 正常情况日志级别使用INFO，需要定位时可以修改为DEBUG，此时SDK会打印和服务端的通信信息
 logging.basicConfig(level=logging.INFO, stream=sys.stdout)
 
-cos_config = CosConfig(
+class COSManager:
-    Region=settings.COS_REGION,
+    def __init__(self):
-    SecretId=settings.TENCENT_SECRET_ID,
+        config = CosConfig(
-    SecretKey=settings.TENCENT_SECRET_KEY
+            Region=settings.COS_REGION,
-)
+            SecretId=settings.TENCENT_SECRET_ID,
+            SecretKey=settings.TENCENT_SECRET_KEY
+        )
+        self.client = CosS3Client(config)
+    
+    def get_upload_url(self, key: str, expires: int = 3600) -> str:
+        """
+        获取预签名上传URL
+        
+        Args:
+            key: 对象键
+            expires: 签名有效期（秒）
+        
+        Returns:
+            预签名URL
+        """
+        try:
+            url = self.client.get_presigned_url(
+                Method='PUT',
+                Bucket=settings.COS_BUCKET,
+                Key=key,
+                Expired=expires
+            )
+            return url
+        except Exception as e:
+            logging.error(f"获取上传URL失败: {str(e)}")
+            raise
+    
+    def get_download_url(self, key: str, expires: int = 3600) -> str:
+        """
+        获取预签名下载URL
+        
+        Args:
+            key: 对象键
+            expires: 签名有效期（秒）
+        
+        Returns:
+            预签名URL
+        """
+        try:
+            url = self.client.get_presigned_url(
+                Method='GET',
+                Bucket=settings.COS_BUCKET,
+                Key=key,
+                Expired=expires
+            )
+            return url
+        except Exception as e:
+            logging.error(f"获取下载URL失败: {str(e)}")
+            raise
+    
+    def put_object(self, **kwargs):
+        """上传对象的封装方法"""
+        return self.client.put_object(**kwargs)
 
-cos_client = CosS3Client(cos_config) 
+# 创建全局 COS 客户端实例
+cos_manager = COSManager() 

requirements.txt

@@ -10,6 +10,7 @@ redis==5.0.1
 pymysql==1.1.0
 SQLAlchemy==2.0.27
 tencentcloud-sdk-python==3.0.1035
+cos-python-sdk-v5
 bcrypt
 aiohttp==3.9.1
 cryptography==42.0.2