Handles relative image URLs and ensures dir exists

RomM/api.py

@@ -652,6 +652,7 @@ def download_rom(self) -> None:
             )
             if not catalogue_path:
                 continue
+            os.makedirs(catalogue_path, exist_ok=True)
 
             filename = self._sanitize_filename(rom.fs_name_no_ext)
             if rom.summary:

RomM/imageutils.py

@@ -3,6 +3,7 @@
 from typing import Optional
 from urllib.error import HTTPError, URLError
 from urllib.request import Request, urlopen
+from urllib.parse import urljoin
 
 from PIL import Image, ImageDraw
 
@@ -54,6 +55,10 @@ def add_rounded_corners(self, image: Image.Image, radius: int = 20):
 
     def load_image_from_url(self, url: str, headers: dict) -> Image.Image | None:
         try:
+            # Use urljoin to properly resolve relative URLs against the host
+            if url:
+                url = urljoin(f'{self.host}/', url)
+
             req = Request(url.split("?")[0], headers=headers)
             with urlopen(req, timeout=60) as response:  # trunk-ignore(bandit/B310)
                 data = response.read()