Add random message filter by reaction

bot.py

@@ -117,11 +117,11 @@ async def on_message(message: discord.Message):
 
 @bot.command(name='random_message', brief='Select a random message from a channel')
 async def random_message_command(ctx: commands.Context, channel: Optional[discord.TextChannel] = None,
-                                 max_cnt: int = 100):
+                                 max_cnt: Optional[int] = 100, reaction_filter: Optional[str] = None):
     typing = ctx.channel.trigger_typing()
     if channel is None:
         channel = ctx.channel
-    messages = async_filter(_is_message_allowed_for_operations, channel.history(limit=max_cnt))
+    messages = async_filter(lambda m: _is_message_valid_for_selection(m, reaction_filter), channel.history(limit=max_cnt))
     messages = [item async for item in messages]
     if not messages:
         await typing
@@ -138,12 +138,24 @@ async def random_message_command(ctx: commands.Context, channel: Optional[discor
     await ctx.channel.send(embed=embed)
 
 
-def _is_message_allowed_for_operations(message: discord.Message) -> bool:
+def _is_message_valid_for_selection(message: discord.Message, reaction_filter: Optional[str] = None) -> bool:
     if message.clean_content.strip() == '':
         return False
+
     for reaction in message.reactions:
         if reaction.emoji == '❌':
             return False
+
+    if reaction_filter is not None:
+        for reaction in message.reactions:
+            if type(reaction.emoji) is str:
+                if reaction.emoji == reaction_filter:
+                    return True
+            elif type(reaction.emoji) is discord.Emoji or type(reaction.emoji) is discord.PartialEmoji:
+                if ':' + reaction.emoji.name + ':' == reaction_filter:
+                    return True
+        return False
+
     return True