make the support command dynamically create invites to reduce raids

cogs/meta.py

@@ -7,6 +7,10 @@ import discord
 from discord.ext import commands
 
 class Meta(commands.Cog):
+	# TODO does this need to be configurable?
+	INVITE_DURATION_SECONDS = 60 * 60 * 3
+	MAX_INVITE_USES = 5
+
 	def __init__(self, bot):
 		self.bot = bot
 
@@ -28,17 +32,29 @@ class Meta(commands.Cog):
 	@commands.command()
 	async def support(self, context):
 		"""Directs you to the support server."""
+		ch = self.bot.get_channel(self.bot.config['support_server_invite_channel'])
+		if ch is None:
+			await context.send('This command is temporarily unavailable. Try again later?')
+			return
+
+		invite = await ch.create_invite(max_age=self.INVITE_DURATION_SECONDS, max_uses=self.MAX_INVITE_USES)
+
 		try:
-			await context.author.send(self.bot.config['support_server_invite'])
-			with contextlib.suppress(discord.HTTPException):
-				await context.message.add_reaction('📬')  # TODO make this emoji configurable too
+			await context.author.send(f'Official support server invite: {invite}')
 		except discord.Forbidden:
 			with contextlib.suppress(discord.HTTPException):
 				await context.message.add_reaction(utils.SUCCESS_EMOJIS[True])
-			await context.send('Unable to send invite in DMs. Please allow DMs from server members.')
+			with contextlib.suppress(discord.HTTPException):
+				await context.send('Unable to send invite in DMs. Please allow DMs from server members.')
+		else:
+			try:
+				await context.message.add_reaction('📬')
+			except discord.HTTPException:
+				with contextlib.suppress(discord.HTTPException):
+					await context.send('📬')
 
 def setup(bot):
 	bot.add_cog(Meta(bot))
 
-	if not bot.config.get('support_server_invite'):
+	if not bot.config.get('support_server_invite_channel'):
 		bot.remove_command('support')

config.example.py

@@ -4,7 +4,10 @@
 		'NOTE: Most commands will be unavailable until both you and the bot have the '
 		'"Manage Emojis" permission.',
 
-	'support_server_invite': 'https://discord.gg/some-invite',
+	# a channel ID to invite people to when they request help with the bot
+	# the bot must have Create Instant Invite permissions for this channel
+	# if set to None, the support command will be disabled
+	'support_server_invite_channel': None,
 
 	'cogs': (
 		'cogs.emote',
@@ -27,7 +30,7 @@
 	'user_agent': 'EmoteManagerBot (https://github.com/bmintz/emote-manager-bot)',
 
 	# emotes that the bot may use to respond to you
-	# If not provided, the bot will use ('❌', '✅') instead.
+	# If not provided, the bot will use '❌', '✅' instead.
 	#
 	# You can obtain these ones from the discordbots.org server under the name "tickNo" and "tickYes"
 	# but I uploaded them to my test server