fix 500 error when not b64 data

Signed-off-by: Hipstercat <tasty@hipstercat.fr>

app/routers/maps.py

@@ -3,6 +3,7 @@ import io
 import os.path
 import pathlib
 import zipfile
+import binascii
 from typing import List, Optional
 from fastapi import APIRouter, HTTPException, Query
 from ..schemas import *
@@ -42,26 +43,31 @@ async def get_map_by_crc(human_crc: Optional[str] = Query(None, min_length=8, ma
 
 @router.post("/maps", tags=["maps"], response_model=MapOut)
 async def upload_map(map_in: MapIn):
-    allowed_name = re.compile("[a-zA-Z-_.\d\(\)\[\] ]+.gck")
+    allowed_name = re.compile(r"[a-zA-Z-_.\d()\[\] ]+.gck")
     filename = map_in.name
     if not allowed_name.fullmatch(filename):
         raise HTTPException(status_code=400, detail="Invalid filename")
 
+    try:
         map_bytes = base64.b64decode(map_in.b64_data.encode("utf8"))
-    if len(map_bytes) > MAX_UPLOAD_SIZE:
+    except binascii.Error:
+        raise HTTPException(status_code=400, detail="Invalid base64 data")
+
+    if len(map_in.b64_data) > MAX_UPLOAD_SIZE:
         raise HTTPException(status_code=400, detail="File too big")
 
+    crc = crc32(map_bytes)
+    for existing_map in MAPS:
+        if existing_map["crc"] == crc:
+            return MapOut(**existing_map)
+
     map_io = io.BytesIO(map_bytes)
     try:
         zipfile.ZipFile(map_io)
     except zipfile.BadZipfile:
         raise HTTPException(status_code=400, detail="File is not a valid map")
 
-    crc = crc32(map_bytes)
-    existing_map = [gmap for gmap in MAPS if gmap["crc"] == crc]
-    if existing_map:
-        return MapOut(**existing_map[0])
-    else:
+    # upload that map
     uploaded_filename = filename
     i = 0
     while os.path.exists(f"{config['upload_path']}{uploaded_filename}"):