Extension of a Sitecore PublishAgent to run publish jobs under a specific user

AuthenticatedPublishAgent.cs

public class AuthenticatedPublishAgent : PublishAgent
{
    private readonly string _userName;

    public string UserName
    {
        get
        {
            return this._userName;
        }
    }

    public AuthenticatedPublishAgent(string sourceDatabase, string targetDatabase, string mode, string languages, string user) : base(sourceDatabase, targetDatabase, mode, languages)
    {
        this._userName = user;
    }

    public void RunAsUser()
    {
        if (string.IsNullOrEmpty(UserName) || !Sitecore.Security.Accounts.User.Exists(UserName))
        {
            Log.Error(string.Format("Unable to run AuthenticatedPublishAgent as user: {0}", UserName), this);
            return;
        }

        var user = Sitecore.Security.Accounts.User.FromName(UserName, false);

        using (new Sitecore.Security.Accounts.UserSwitcher(user))
        {
            base.Run();
        }
    }
}

Scheduling Agent Config

<agent type="MyNameSpace.AuthenticatedPublishAgent" method="RunAsUser" interval="01:00:00">
  <param desc="source database">master</param>
  <param desc="target database">web</param>
  <param desc="mode (full or smart or incremental)">smart</param>
  <param desc="languages">en</param>
  <param desc="user">sitecore\AutoPublishingUser</param>
</agent>