release: publish saldo 0.1.0

app/utils/uploads.py

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+from __future__ import annotations
+
+from pathlib import Path
+from uuid import uuid4
+
+from flask import current_app, url_for
+from werkzeug.datastructures import FileStorage
+from werkzeug.utils import secure_filename
+
+
+ALLOWED_AVATAR_EXTENSIONS = {".png", ".jpg", ".jpeg", ".webp", ".gif"}
+
+
+def save_avatar_upload(file_storage: FileStorage | None) -> str | None:
+    if file_storage is None or not file_storage.filename:
+        return None
+
+    original_name = secure_filename(file_storage.filename)
+    suffix = Path(original_name).suffix.lower()
+    if suffix not in ALLOWED_AVATAR_EXTENSIONS:
+        raise ValueError("Bitte ein Bild als PNG, JPG, WEBP oder GIF hochladen.")
+
+    upload_dir = Path(current_app.config["AVATAR_UPLOAD_DIR"])
+    upload_dir.mkdir(parents=True, exist_ok=True)
+
+    filename = f"{uuid4().hex}{suffix}"
+    file_storage.save(upload_dir / filename)
+    return url_for("main.uploaded_avatar", filename=filename)