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app/utils/file_utils.py

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+from __future__ import annotations
+
+import os
+import uuid
+
+from fastapi import UploadFile
+
+UPLOAD_DIR = "uploads"
+
+
+async def save_upload(file: UploadFile, subdir: str = "") -> str:
+    directory = os.path.join(UPLOAD_DIR, subdir) if subdir else UPLOAD_DIR
+    os.makedirs(directory, exist_ok=True)
+
+    ext = os.path.splitext(file.filename or "")[1]
+    filename = f"{uuid.uuid4().hex}{ext}"
+    filepath = os.path.join(directory, filename)
+
+    content = await file.read()
+    with open(filepath, "wb") as f:
+        f.write(content)
+
+    return filepath