bettah bulk bans (#2915)

src/Discord.Net.Core/DiscordConfig.cs

@@ -256,5 +256,10 @@ namespace Discord
         ///     Returns the maximum number of entitlements that can be gotten per-batch.
         /// </summary>
         public const int MaxEntitlementsPerBatch = 100;
+
+        /// <summary>
+        ///     Returns the maximum number of bans that can be banned in a single bulk request.
+        /// </summary>
+        public const int MaxBansPerBulkBatch = 200;
     }
 }

src/Discord.Net.Rest/Entities/Guilds/GuildHelper.cs

@@ -251,9 +251,20 @@ namespace Discord.Rest
 
         public static async Task<BulkBanResult> BulkBanAsync(IGuild guild, BaseDiscordClient client, ulong[] userIds, int? deleteMessageSeconds, RequestOptions options)
         {
-            var model = await client.ApiClient.BulkBanAsync(guild.Id, userIds, deleteMessageSeconds, options);
+            var pos = 0;
-            return new(model.BannedUsers?.ToImmutableArray() ?? ImmutableArray<ulong>.Empty,
+            var banned = new List<ulong>(userIds.Length);
-                model.FailedUsers?.ToImmutableArray() ?? ImmutableArray<ulong>.Empty);
+            var failed = new List<ulong>();
+            while (pos * DiscordConfig.MaxBansPerBulkBatch < userIds.Length)
+            {
+                var toBan = userIds
+                    .Skip(pos * DiscordConfig.MaxBansPerBulkBatch)
+                    .Take(DiscordConfig.MaxBansPerBulkBatch);
+                pos++;
+                var model = await client.ApiClient.BulkBanAsync(guild.Id, toBan.ToArray(), deleteMessageSeconds, options);
+                banned.AddRange(model.BannedUsers ?? []);
+                failed.AddRange(model.FailedUsers ?? []);
+            }
+            return new(banned.ToImmutableArray(), failed.ToImmutableArray());
         }
         #endregion
 
@@ -620,7 +631,7 @@ namespace Discord.Rest
 
             var createGuildRoleParams = new API.Rest.ModifyGuildRoleParams
             {
-                Color = color?.RawValue ?? Optional.Create<uint>(), 
+                Color = color?.RawValue ?? Optional.Create<uint>(),
                 Hoist = isHoisted,
                 Mentionable = isMentionable,
                 Name = name,