[Mod] Added [p]hackban

cogs/mod.py

@@ -18,6 +18,7 @@ ACTIONS_REPR = {
     "CMUTE"   : ("Channel mute", "\N{SPEAKER WITH CANCELLATION STROKE}"),
     "SMUTE"   : ("Server mute", "\N{SPEAKER WITH CANCELLATION STROKE}"),
     "SOFTBAN" : ("Softban", "\N{DASH SYMBOL} \N{HAMMER}"),
+    "HACKBAN" : ("Preemptive ban", "\N{BUST IN SILHOUETTE} \N{HAMMER}"),
     "UNBAN"   : ("Unban", "\N{DOVE OF PEACE}")
 }
 
@@ -27,6 +28,7 @@ ACTIONS_CASES = {
     "CMUTE"   : False,
     "SMUTE"   : True,
     "SOFTBAN" : True,
+    "HACKBAN" : True,
     "UNBAN"   : True
 }
 
@@ -388,6 +390,49 @@ class Mod:
         except Exception as e:
             print(e)
 
+    @commands.command(no_pm=True, pass_context=True)
+    @checks.admin_or_permissions(ban_members=True)
+    async def hackban(self, ctx, user_id: int, *, reason: str = None):
+        """Preemptively bans user from the server
+
+        A user ID needs to be provided
+        If the user is present in the server a normal ban will be
+        issued instead"""
+        user_id = str(user_id)
+        author = ctx.message.author
+        server = author.server
+
+        ban_list = await self.bot.get_bans(server)
+        is_banned = discord.utils.get(ban_list, id=user_id)
+
+        if is_banned:
+            await self.bot.say("User is already banned.")
+            return
+
+        user = server.get_member(user_id)
+        if user is not None:
+            await ctx.invoke(self.ban, user=user, reason=reason)
+            return
+
+        try:
+            await self.bot.http.ban(user_id, server.id)
+        except discord.NotFound:
+            await self.bot.say("User not found. Have you provided the "
+                               "correct user ID?")
+        except discord.Forbidden:
+            await self.bot.say("I lack the permissions to do this.")
+        else:
+            logger.info("{}({}) hackbanned {}"
+                        "".format(author.name, author.id, user_id))
+            user = await self.bot.get_user_info(user_id)
+            await self.new_case(server,
+                                action="HACKBAN",
+                                mod=author,
+                                user=user,
+                                reason=reason)
+            await self.bot.say("Done. The user will not be able to join this "
+                               "server.")
+
     @commands.command(no_pm=True, pass_context=True)
     @checks.admin_or_permissions(ban_members=True)
     async def softban(self, ctx, user: discord.Member, *, reason: str = None):