{
  lib,
  fetchurl,
}:
with builtins;
  {
    project,
    id,
    filename,
    ...
  } @ args: let
    # I think this is supposed to be some weak automation
    # protection. This split "id" is simply part of the download URL.
    #
    # Note that if it's zero-prefixed we need to remove the zeroes. It's
    # really an odd one...
    a = head (match "0*([[:digit:]]+)" (substring 0 4 (toString id)));
    b = head (match "0*([[:digit:]]+)" (substring 4 7 (toString id)));
    encoded-filename = replaceStrings [" "] ["%20"] filename;

    url = "https://media.forgecdn.net/files/${a}/${b}/${encoded-filename}";
    otherArgs = removeAttrs args ["project" "project_id" "id" "filename"];
  in
    fetchurl (otherArgs
      // {
        inherit url;
        # Rename files to avoid names incompatible with the nix store
        name = "${project}.jar";
        # Avoid accidental URL globbing
        curlOpts = "--globoff";
      })