Add pardon command and tests (#3190)

* Add pardon command

* Make pardoning check for an existing ban and unban first

* Add pardon test and documentation

Content.Server/Administration/Commands/PardonCommand.cs

@@ -0,0 +1,65 @@
+using System;
+using System.Text;
+using Content.Server.Database;
+using Content.Shared.Administration;
+using Robust.Server.Player;
+using Robust.Shared.Console;
+using Robust.Shared.IoC;
+
+#nullable enable
+
+namespace Content.Server.Administration.Commands
+{
+    [AdminCommand(AdminFlags.Ban)]
+    public class PardonCommand : IConsoleCommand
+    {
+        public string Command => "pardon";
+        public string Description => "Pardons somebody's ban";
+        public string Help => $"Usage: {Command} <ban id>";
+
+        public async void Execute(IConsoleShell shell, string argStr, string[] args)
+        {
+            var player = shell.Player as IPlayerSession;
+            var dbMan = IoCManager.Resolve<IServerDbManager>();
+
+            if (args.Length != 1)
+            {
+                shell.WriteLine(Help);
+                return;
+            }
+
+            if (!int.TryParse(args[0], out var banId))
+            {
+                shell.WriteLine($"Unable to parse {args[1]} as a ban id integer.\n{Help}");
+                return;
+            }
+
+            var ban = await dbMan.GetServerBanAsync(banId);
+
+            if (ban == null)
+            {
+                shell.WriteLine($"No ban found with id {banId}");
+                return;
+            }
+
+            if (ban.Unban != null)
+            {
+                var response = new StringBuilder("This ban has already been pardoned");
+
+                if (ban.Unban.UnbanningAdmin != null)
+                {
+                    response.Append($" by {ban.Unban.UnbanningAdmin.Value}");
+                }
+
+                response.Append($" in {ban.Unban.UnbanTime}.");
+
+                shell.WriteLine(response.ToString());
+                return;
+            }
+
+            await dbMan.AddServerUnbanAsync(new ServerUnbanDef(banId, player?.UserId, DateTimeOffset.Now));
+
+            shell.WriteLine($"Pardoned ban with id {banId}");
+        }
+    }
+}