Add backend api and engine

api/app/storage.py

@@ -0,0 +1,56 @@
+import os
+from datetime import datetime
+from minio import Minio
+import uuid
+
+# MinIO 配置
+MINIO_ENDPOINT = os.getenv("MINIO_ENDPOINT", "localhost:9000")
+MINIO_ACCESS_KEY = os.getenv("MINIO_ACCESS_KEY", "admin")
+MINIO_SECRET_KEY = os.getenv("MINIO_SECRET_KEY", "password123")
+MINIO_BUCKET = os.getenv("MINIO_BUCKET", "ai-audio")
+
+# 初始化客户端
+minio_client = Minio(
+    MINIO_ENDPOINT,
+    access_key=MINIO_ACCESS_KEY,
+    secret_key=MINIO_SECRET_KEY,
+    secure=False
+)
+
+
+def ensure_bucket():
+    """确保 Bucket 存在"""
+    try:
+        if not minio_client.bucket_exists(MINIO_BUCKET):
+            minio_client.make_bucket(MINIO_BUCKET)
+    except Exception as e:
+        print(f"Warning: MinIO bucket check failed: {e}")
+
+
+def upload_audio(file_path: str, call_id: str, turn_index: int) -> str:
+    """上传音频片段，返回访问 URL"""
+    ensure_bucket()
+    
+    ext = os.path.splitext(file_path)[1] or ".mp3"
+    object_name = f"{call_id}/{call_id}-{turn_index:03d}{ext}"
+    
+    try:
+        minio_client.fput_object(MINIO_BUCKET, object_name, file_path)
+        return minio_client.presigned_get_object(MINIO_BUCKET, object_name, expires=604800)
+    except Exception as e:
+        print(f"Warning: MinIO upload failed: {e}")
+        return ""
+
+
+def get_audio_url(call_id: str, turn_index: int) -> str:
+    """获取音频 URL"""
+    object_name = f"{call_id}/{call_id}-{turn_index:03d}.mp3"
+    try:
+        return minio_client.presigned_get_object(MINIO_BUCKET, object_name, expires=604800)
+    except Exception:
+        return ""
+
+
+def generate_local_url(call_id: str, turn_index: int) -> str:
+    """生成本地 URL（如果不用 MinIO）"""
+    return f"/api/history/{call_id}/audio/{turn_index}"