Finish MVP and dockerize

apps/backend/fastapi/app/services/storage.py

@@ -0,0 +1,51 @@
+from __future__ import annotations
+
+from datetime import datetime
+from pathlib import Path
+from typing import Tuple
+
+from fastapi import UploadFile
+
+from app.core.config import get_settings
+from dlib.storage import MinioStorageClient, MinioStorageConfig
+
+
+def _build_storage_client() -> MinioStorageClient:
+    settings = get_settings()
+    config = MinioStorageConfig(
+        bucket_name=settings.storage_bucket,
+        region_name=settings.storage_region,
+        endpoint_url=settings.storage_endpoint_url,
+        access_key_id=settings.storage_access_key,
+        secret_access_key=settings.storage_secret_key,
+        path_prefix=settings.storage_path_prefix,
+    )
+    return MinioStorageClient(config)
+
+
+storage_client = _build_storage_client()
+
+
+def build_artifact_key(owner_id: str, suffix: str) -> str:
+    safe_suffix = suffix.lstrip(".") if suffix else ""
+    timestamp = datetime.utcnow().strftime("%Y%m%d%H%M%S")
+    return storage_client.build_key(
+        stem=f"{owner_id}-{timestamp}", extension=safe_suffix
+    )
+
+
+async def persist_upload(upload: UploadFile, owner_id: str) -> Tuple[str, bytes]:
+    data = await upload.read()
+    suffix = Path(upload.filename or "document.docx").suffix or ".docx"
+    key = build_artifact_key(owner_id, suffix)
+    storage_client.upload_bytes(key=key, data=data, content_type=upload.content_type)
+    return key, data
+
+
+def build_public_url(key: str) -> str | None:
+    settings = get_settings()
+    if settings.storage_endpoint_url:
+        # Object storage accessible through endpoint URL
+        base = settings.storage_endpoint_url.rstrip("/")
+        return f"{base}/{settings.storage_bucket}/{key}"
+    return storage_client.generate_presigned_url(key=key, expires_in=3600)