1 files changed, 20 insertions, 0 deletions
diff --git a/bot/converters.py b/bot/converters.py
index 6c87a50fe..3066eaabb 100644
--- a/bot/converters.py
+++ b/bot/converters.py
@@ -15,6 +15,7 @@ from discord.utils import DISCORD_EPOCH, snowflake_time
 
 from bot.api import ResponseCodeError
 from bot.constants import URLs
+from bot.exts.info.doc import _inventory_parser
 from bot.utils.regex import INVITE_RE
 
 log = logging.getLogger(__name__)
@@ -175,6 +176,25 @@ class ValidURL(Converter):
         return url
 
 
+class InventoryURL(Converter):
+    """
+    Represents an Intersphinx inventory URL.
+
+    This converter checks whether intersphinx accepts the given inventory URL, and raises
+    `BadArgument` if that is not the case.
+
+    Otherwise, it simply passes through the given URL.
+    """
+
+    @staticmethod
+    async def convert(ctx: Context, url: str) -> str:
+        """Convert url to Intersphinx inventory URL."""
+        await ctx.trigger_typing()
+        if await _inventory_parser.fetch_inventory(ctx.bot.http_session, url) is None:
+            raise BadArgument(f"Failed to fetch inventory file after {_inventory_parser.FAILED_REQUEST_ATTEMPTS}.")
+        return url
+
+
 class Snowflake(IDConverter):
     """
     Converts to an int if the argument is a valid Discord snowflake.