ValidationFeature ServiceStack

gistfile1.cs

public class ValidationFeature : IPlugin
{
 private readonly IErrorResponseFactory _errorResponseFactory;

 public ValidationFeature(IErrorResponseFactory errorResponseFactory)
 {
  _errorResponseFactory = errorResponseFactory;
 }

 public static bool Enabled { private set; get; }

 /// <summary>
 /// Activate the validation mechanism, so every request DTO with an existing validator
 /// will be validated.
 /// </summary>
 /// <param name="appHost">The app host</param>
 public void Register(IAppHost appHost)
 {
  Enabled = true;
  var filter = new ValidationFilters(_errorResponseFactory);
  appHost.RequestFilters.Add(filter.RequestFilter);
 }
}


public class ValidationFilters
{
 private readonly IErrorResponseFactory _errorResponseFactory;

 public ValidationFilters(IErrorResponseFactory errorResponseFactory)
 {
  _errorResponseFactory = errorResponseFactory;
 }

 public void RequestFilter(IHttpRequest req, IHttpResponse res, object requestDto)
 {
  var validator = ValidatorCache.GetValidator(req, requestDto.GetType());
  if (validator != null)
  {
   var ruleSet = req.HttpMethod;
   var validationResult = validator.Validate(
    new ValidationContext(requestDto, null, new MultiRuleSetValidatorSelector(ruleSet)));

   if (validationResult.IsValid) return;

   var errorResponse = _errorResponseFactory.CreateErrorResponse(requestDto, validationResult.ToErrorResult());

   res.WriteToResponse(req, errorResponse);
  }
 }
}