internal static async Task ExecuteWithExceptionHandling(this Func<IOwinContext, HandlerSettings, Task> actionToRun, IOwinContext context, HandlerSettings options)
{
Exception caughtException;
try
{
await actionToRun(context, options);
return;
}
catch (Exception ex)
{
caughtException = ex;
}
var httpStatusException = caughtException as HttpStatusException;
if (httpStatusException != null)
{
await context.HandleHttpStatusException(httpStatusException, options);
return;
}
var invalidOperationException = caughtException as InvalidOperationException;
if (invalidOperationException != null)
{
await context.HandleBadRequest(invalidOperationException, options);
return;
}
await context.HandleInternalServerError(caughtException, options);
}
internal static Task HandleHttpStatusException(this IOwinContext context, HttpStatusException exception, HandlerSettings options, string contentType = "application/json")
{
context.Response.StatusCode = (int) exception.StatusCode;
context.Response.ReasonPhrase = exception.StatusCode.ToString();
context.Response.ContentType = contentType;
ExceptionModel exceptionModel = options.ExceptionToModelConverter.Convert(exception);
string exceptionJson = options.Serializer.Serialize(exceptionModel);
byte[] exceptionBytes = Encoding.UTF8.GetBytes(exceptionJson);
context.Response.ContentLength = exceptionBytes.Length;
return context.Response.WriteAsync(exceptionBytes);
}
internal static Task HandleInternalServerError(this IOwinContext context, Exception ex, HandlerSettings options)
{
var exception = new HttpStatusException(ex.Message, 500, ex);
return HandleHttpStatusException(context, exception, options);
}
internal static Task HandleBadRequest(this IOwinContext context, InvalidOperationException ex, HandlerSettings options)
{
var exception = new HttpStatusException(ex.Message, 400, ex);
return HandleHttpStatusException(context, exception, options);
}