feat(api): add tencent cos storage for memoir images

Made-with: Cursor

api/requirements.txt

@@ -47,6 +47,9 @@ tencentcloud-sdk-python>=3.0.1000
 
 openai
 
+# Tencent COS for memoir image storage
+cos-python-sdk-v5>=1.9.30
+
 # Payment - WeChat Pay & Alipay
 wechatpayv3>=0.3.0
 python-alipay-sdk>=3.0.0

api/services/memoir_images/storage.py

@@ -0,0 +1,30 @@
+import os
+
+from qcloud_cos import CosConfig, CosS3Client
+
+
+class TencentCosStorageService:
+    def __init__(self, secret_id: str, secret_key: str, region: str, bucket: str, base_url: str):
+        self.bucket = bucket
+        self.base_url = base_url.rstrip("/")
+        config = CosConfig(Region=region, SecretId=secret_id, SecretKey=secret_key)
+        self.client = CosS3Client(config)
+
+    def upload_bytes(self, image_bytes: bytes, key: str, content_type: str) -> str:
+        self.client.put_object(
+            Bucket=self.bucket,
+            Body=image_bytes,
+            Key=key,
+            ContentType=content_type,
+        )
+        return f"{self.base_url}/{key}"
+
+    @classmethod
+    def from_env(cls) -> "TencentCosStorageService":
+        return cls(
+            secret_id=os.getenv("TENCENT_COS_SECRET_ID", ""),
+            secret_key=os.getenv("TENCENT_COS_SECRET_KEY", ""),
+            region=os.getenv("TENCENT_COS_REGION", ""),
+            bucket=os.getenv("TENCENT_COS_BUCKET", ""),
+            base_url=os.getenv("TENCENT_COS_BASE_URL", ""),
+        )

api/tests/test_memoir_image_storage.py

@@ -0,0 +1,30 @@
+import unittest
+from unittest.mock import Mock, patch
+
+from api.services.memoir_images.storage import TencentCosStorageService
+
+
+class MemoirImageStorageTest(unittest.TestCase):
+    @patch("api.services.memoir_images.storage.CosS3Client")
+    def test_upload_bytes_returns_persistent_cos_url(self, client_cls):
+        client = Mock()
+        client_cls.return_value = client
+        storage = TencentCosStorageService(
+            secret_id="id",
+            secret_key="key",
+            region="ap-shanghai",
+            bucket="memoir-1250000000",
+            base_url="https://memoir-1250000000.cos.ap-shanghai.myqcloud.com",
+        )
+
+        url = storage.upload_bytes(
+            image_bytes=b"png-bytes",
+            key="memoirs/u1/c1/0-demo.png",
+            content_type="image/png",
+        )
+
+        self.assertEqual(
+            url,
+            "https://memoir-1250000000.cos.ap-shanghai.myqcloud.com/memoirs/u1/c1/0-demo.png",
+        )
+        client.put_object.assert_called_once()