Sitecore CMS - Field level security validation for the SaveUI Pipeline so we could make sure no editor suddenly made changes to restricted languages versions of the same items.

gistfile1.cs

 public class EnsureLanguageWriteAccess
    {
        public int Limit
        {
            get;
            set;
        }
 
        public void Process(Sitecore.Pipelines.Save.SaveArgs args)
        {
            Sitecore.Diagnostics.Assert.ArgumentNotNull(args, "args");
            if (args.Items == null)
            {
                return;
            }
 
            foreach (Sitecore.Pipelines.Save.SaveArgs.SaveItem saveItem in args.Items)
            {
                var itemlang = Sitecore.Client.ContentDatabase.GetItem(string.Format("/sitecore/system/Languages/{0}", saveItem.Language));
                if (itemlang != null && Sitecore.Security.AccessControl.AuthorizationManager.IsDenied(itemlang
                                                                , Sitecore.Security.AccessControl.AccessRight.LanguageWrite
                                                                , Sitecore.Context.User))
                {
                    string loggedErrorMessage = string.Format("The user {0} has tried to edit a language {1} where AccessRight.LanguageWrite is denied. (item: {2})", Sitecore.Context.GetUserName(), saveItem.Language.Name, saveItem.ID.ToString());
                    Log.Error(loggedErrorMessage, typeof(EnsureLanguageWriteAccess));
                    SheerResponse.Alert(string.Format("You cannot edit this item because you do not have write access to the current language ({0})", saveItem.Language.Name));
                    args.SaveAnimation = false;
                    args.AbortPipeline();
                    return;
                }                
            }
        }