Add file checksum validation

delivery1/server/requirements.txt

@@ -1,4 +1,3 @@
 cryptography
 flask
 flask_sqlalchemy
-pytest

delivery1/server/routes/file.py

@@ -83,6 +83,13 @@ def file_upload_content():
     if not file:
         return jsonify({"error": "Invalid file data"}), 400
 
+    file_sum = request.headers.get("File-Checksum")
+    if not file_sum:
+        return jsonify({"error": "No file checksum provided"}), 400
+
+    if file_sum != utils.get_hash(file.stream):
+        return jsonify({"error": "File checksum mismatch"}), 400
+
     file = upload_service.write_file(session_token, file.stream)
     if isinstance(file, tuple):
         return file