Verify that target sizes are sane

jarvis/cogs/image.py

@@ -58,6 +58,7 @@ class ImageCog(Scale):
     async def _resize(
         self, ctx: InteractionContext, target: str, attachment: Attachment = None, url: str = None
     ) -> None:
+        await ctx.defer()
         if not attachment and not url:
             await ctx.send("A URL or attachment is required", ephemeral=True)
             return
@@ -73,10 +74,18 @@ class ImageCog(Scale):
             )
             return
 
-        tgt_size = unconvert_bytesize(float(tgt.groups()[0]), tgt.groups()[1])
+        try:
+            tgt_size = unconvert_bytesize(float(tgt.groups()[0]), tgt.groups()[1])
+        except ValueError:
+            await ctx.send("Failed to read your target size. Try a more sane one", ephemeral=True)
+            return
+
         if tgt_size > unconvert_bytesize(8, "MB"):
             await ctx.send("Target too large to send. Please make target < 8MB", ephemeral=True)
             return
+        elif tgt_size < 1024:
+            await ctx.send("Sizes < 1KB are extremely unreliable and are disabled", ephemeral=True)
+            return
 
         if attachment:
             url = attachment.url
@@ -91,7 +100,7 @@ class ImageCog(Scale):
 
         size = len(data)
         if size <= tgt_size:
-            await ctx.send("Image already meets target.")
+            await ctx.send("Image already meets target.", ephemeral=True)
             return
 
         ratio = max(tgt_size / size - 0.02, 0.50)