Roles/AddRole.cs

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+using System.IO.Compression;
+using System.Runtime.CompilerServices;
+using Discord;
+using Discord.Commands;
+using Discord.Rest;
+using Discord.WebSocket;
+using Microsoft.Win32.SafeHandles;
+using PluginManager.Interfaces;
+using PluginManager.Others;
+using Roles.Internals;
+
+namespace Roles
+{
+    public class AddRole : DBCommand
+    {
+        public string Command => "addrole";
+
+        public List<string> Aliases => new() { "ar", "addr", "roleadd" };
+
+        public string Description => "Role options";
+
+        public string Usage => "addrole [user1] [user2] ... [role1] [role2] ...";
+
+        public bool canUseDM => false;
+
+        public bool canUseServer => true;
+
+        public bool requireAdmin => true;
+
+        public async void Execute(SocketCommandContext context, SocketMessage message, DiscordSocketClient client, bool isDM)
+        {
+            if (message.MentionedUsers.Count == 0 || message.MentionedRoles.Count == 0)
+            {
+                await context.Channel.SendMessageAsync($"Invalid invocation\nUsage:{Usage}");
+                return;
+            }
+
+            try
+            {
+                var users = message.MentionedUsers;
+                var roles = message.MentionedRoles as IEnumerable<IRole>;
+
+                foreach (var user in users)
+                {
+                    SocketGuildUser? usr = context.Client.GetUser(user.Username, user.Discriminator) as SocketGuildUser;
+                    if (usr is null)
+                        throw new Exception("User is null");
+                    await usr.AddRolesAsync(roles);
+                }
+            }
+            catch (Exception ex)
+            {
+                await context.Channel.SendMessageAsync(ex.Message);
+            }
+        }
+    }
+}

Roles/Internals/RoleManagement.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Discord;
+using Discord.WebSocket;
+using PluginManager.Others;
+
+namespace Roles.Internals
+{
+    internal static class RoleManagement
+    {
+        internal static async void AddRole(this SocketGuildUser user, string roleName)
+        {
+            string role = roleName;
+            IRole? r    = user.Guild.Roles.FirstOrDefault(rl => rl.Name == role || rl.Mention == role);
+            if (r is null)
+                throw new Exception("The role does not exist");
+
+            try
+            {
+                await user.AddRoleAsync(r);
+            }
+            catch (Exception ex)
+            {
+                if (ex.Message.Contains("Permission", StringComparison.CurrentCultureIgnoreCase))
+                    throw new Exception("Insufficient permissions");
+            }
+        }
+
+        internal static async void AddRole(this SocketGuildUser user, IRole role)
+        {
+            try
+            {
+                await user.AddRoleAsync(role);
+            }
+            catch (Exception ex)
+            {
+                if (ex.Message.Contains("Permission", StringComparison.CurrentCultureIgnoreCase))
+                    throw new Exception("Insufficient permissions");
+            }
+        }
+
+        internal static async void AddRoles(this SocketGuildUser user, string[] roleNames)
+        {
+            foreach (string rolename in roleNames)
+            {
+                string roleName = rolename;
+                IRole? r        = user.Guild.Roles.FirstOrDefault(rl => rl.Name == roleName || rl.Mention == roleName);
+                if (r is null)
+                    throw new Exception("The role does not exist");
+
+                try
+                {
+                    await user.AddRoleAsync(r);
+                }
+                catch (Exception ex)
+                {
+                    if (ex.Message.Contains("Permission", StringComparison.CurrentCultureIgnoreCase))
+                        throw new Exception("Insufficient permissions");
+                }
+            }
+        }
+
+        internal static async void AddRoles(this SocketGuildUser user, IEnumerable<IRole> roles)
+        {
+            try
+            {
+                await user.AddRolesAsync(roles);
+            }
+            catch (Exception ex)
+            {
+                if (ex.Message.Contains("Permission", StringComparison.CurrentCultureIgnoreCase))
+                    throw new Exception("Insufficient permissions");
+            }
+        }
+    }
+}

Roles/Roles.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\PluginManager\PluginManager.csproj" />
+  </ItemGroup>
+
+</Project>