create roles with icons (#2792)

src/Discord.Net.Core/Entities/Guilds/IGuild.cs

@@ -875,11 +875,13 @@ namespace Discord
         /// <param name="isHoisted">Whether the role is separated from others on the sidebar.</param>
         /// <param name="isMentionable">Whether the role can be mentioned.</param>
         /// <param name="options">The options to be used when sending the request.</param>
+        /// <param name="icon">The icon for the role.</param>
+        /// <param name="emoji">The unicode emoji to be used as an icon for the role.</param>
         /// <returns>
         ///     A task that represents the asynchronous creation operation. The task result contains the newly created
         ///     role.
         /// </returns>
-        Task<IRole> CreateRoleAsync(string name, GuildPermissions? permissions = null, Color? color = null, bool isHoisted = false, bool isMentionable = false, RequestOptions options = null);
+        Task<IRole> CreateRoleAsync(string name, GuildPermissions? permissions = null, Color? color = null, bool isHoisted = false, bool isMentionable = false, RequestOptions options = null, Image? icon = null, Emoji emoji = null);
 
         /// <summary>
         ///     Adds a user to this guild.

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

@@ -4,6 +4,7 @@ using Discord.API.Rest;
 using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
+using System.Data;
 using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
@@ -488,18 +489,30 @@ namespace Discord.Rest
         #region Roles
         /// <exception cref="ArgumentNullException"><paramref name="name"/> is <see langword="null" />.</exception>
         public static async Task<RestRole> CreateRoleAsync(IGuild guild, BaseDiscordClient client,
-            string name, GuildPermissions? permissions, Color? color, bool isHoisted, bool isMentionable, RequestOptions options)
+            string name, GuildPermissions? permissions, Color? color, bool isHoisted, bool isMentionable, RequestOptions options, Image? icon, Emoji emoji)
         {
             if (name == null)
                 throw new ArgumentNullException(paramName: nameof(name));
 
+            if (icon is not null || emoji is not null)
+            {
+                guild.Features.EnsureFeature(GuildFeature.RoleIcons);
+
+                if (icon is not null && emoji is not null)
+                {
+                    throw new ArgumentException("Emoji and Icon properties cannot be present on a role at the same time.");
+                }
+            }
+
             var createGuildRoleParams = new API.Rest.ModifyGuildRoleParams
             {
                 Color = color?.RawValue ?? Optional.Create<uint>(), 
                 Hoist = isHoisted,
                 Mentionable = isMentionable,
                 Name = name,
-                Permissions = permissions?.RawValue.ToString() ?? Optional.Create<string>()
+                Permissions = permissions?.RawValue.ToString() ?? Optional.Create<string>(),
+                Icon = icon?.ToModel(),
+                Emoji = emoji?.Name
             };
 
             var model = await client.ApiClient.CreateGuildRoleAsync(guild.Id, createGuildRoleParams, options).ConfigureAwait(false);

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

@@ -812,14 +812,16 @@ namespace Discord.Rest
         /// <param name="isHoisted">Whether the role is separated from others on the sidebar.</param>
         /// <param name="options">The options to be used when sending the request.</param>
         /// <param name="isMentionable">Whether the role can be mentioned.</param>
+        /// <param name="icon">The icon for the role.</param>
+        /// <param name="emoji">The unicode emoji to be used as an icon for the role.</param>
         /// <returns>
         ///     A task that represents the asynchronous creation operation. The task result contains the newly created
         ///     role.
         /// </returns>
         public async Task<RestRole> CreateRoleAsync(string name, GuildPermissions? permissions = default(GuildPermissions?), Color? color = default(Color?),
-            bool isHoisted = false, bool isMentionable = false, RequestOptions options = null)
+            bool isHoisted = false, bool isMentionable = false, RequestOptions options = null, Image? icon = null, Emoji emoji = null)
         {
-            var role = await GuildHelper.CreateRoleAsync(this, Discord, name, permissions, color, isHoisted, isMentionable, options).ConfigureAwait(false);
+            var role = await GuildHelper.CreateRoleAsync(this, Discord, name, permissions, color, isHoisted, isMentionable, options, icon, emoji).ConfigureAwait(false);
             _roles = _roles.Add(role.Id, role);
             return role;
         }
@@ -1485,8 +1487,8 @@ namespace Discord.Rest
         async Task<IRole> IGuild.CreateRoleAsync(string name, GuildPermissions? permissions, Color? color, bool isHoisted, RequestOptions options)
             => await CreateRoleAsync(name, permissions, color, isHoisted, false, options).ConfigureAwait(false);
         /// <inheritdoc />
-        async Task<IRole> IGuild.CreateRoleAsync(string name, GuildPermissions? permissions, Color? color, bool isHoisted, bool isMentionable, RequestOptions options)
+        async Task<IRole> IGuild.CreateRoleAsync(string name, GuildPermissions? permissions, Color? color, bool isHoisted, bool isMentionable, RequestOptions options, Image? icon, Emoji emoji)
-            => await CreateRoleAsync(name, permissions, color, isHoisted, isMentionable, options).ConfigureAwait(false);
+            => await CreateRoleAsync(name, permissions, color, isHoisted, isMentionable, options, icon, emoji).ConfigureAwait(false);
 
         /// <inheritdoc />
         async Task<IGuildUser> IGuild.AddGuildUserAsync(ulong userId, string accessToken, Action<AddGuildUserProperties> func, RequestOptions options)

src/Discord.Net.WebSocket/Entities/Guilds/SocketGuild.cs

@@ -1084,14 +1084,16 @@ namespace Discord.WebSocket
         /// <param name="isHoisted">Whether the role is separated from others on the sidebar.</param>
         /// <param name="isMentionable">Whether the role can be mentioned.</param>
         /// <param name="options">The options to be used when sending the request.</param>
+        /// <param name="icon">The icon for the role.</param>
+        /// <param name="emoji">The unicode emoji to be used as an icon for the role.</param>
         /// <exception cref="ArgumentNullException"><paramref name="name"/> is <see langword="null"/>.</exception>
         /// <returns>
         ///     A task that represents the asynchronous creation operation. The task result contains the newly created
         ///     role.
         /// </returns>
         public Task<RestRole> CreateRoleAsync(string name, GuildPermissions? permissions = default(GuildPermissions?), Color? color = default(Color?),
-            bool isHoisted = false, bool isMentionable = false, RequestOptions options = null)
+            bool isHoisted = false, bool isMentionable = false, RequestOptions options = null, Image? icon = null, Emoji emoji = null)
-            => GuildHelper.CreateRoleAsync(this, Discord, name, permissions, color, isHoisted, isMentionable, options);
+            => GuildHelper.CreateRoleAsync(this, Discord, name, permissions, color, isHoisted, isMentionable, options, icon, emoji);
         internal SocketRole AddRole(RoleModel model)
         {
             var role = SocketRole.Create(this, Discord.State, model);
@@ -2114,8 +2116,8 @@ namespace Discord.WebSocket
         async Task<IRole> IGuild.CreateRoleAsync(string name, GuildPermissions? permissions, Color? color, bool isHoisted, RequestOptions options)
             => await CreateRoleAsync(name, permissions, color, isHoisted, false, options).ConfigureAwait(false);
         /// <inheritdoc />
-        async Task<IRole> IGuild.CreateRoleAsync(string name, GuildPermissions? permissions, Color? color, bool isHoisted, bool isMentionable, RequestOptions options)
+        async Task<IRole> IGuild.CreateRoleAsync(string name, GuildPermissions? permissions, Color? color, bool isHoisted, bool isMentionable, RequestOptions options, Image? icon, Emoji emoji)
-            => await CreateRoleAsync(name, permissions, color, isHoisted, isMentionable, options).ConfigureAwait(false);
+            => await CreateRoleAsync(name, permissions, color, isHoisted, isMentionable, options, icon, emoji).ConfigureAwait(false);
 
         /// <inheritdoc />
         async Task<IReadOnlyCollection<IGuildUser>> IGuild.GetUsersAsync(CacheMode mode, RequestOptions options)