public override void OnActionExecuting(ActionExecutingContext context)
{
var logger = context.HttpContext.RequestServices.GetService(typeof(ILogger <ValidatePaginationAttribute>)) as ILogger <ValidatePaginationAttribute>;
var ioptions = context.HttpContext.RequestServices.GetService(typeof(IOptions <NexusatAspNetCoreOptions>)) as IOptions <NexusatAspNetCoreOptions>;
var options = ioptions.Value;
int?p_size, p_index;
ParsePageCursor(options, context.HttpContext.Request.Query, out p_size, out p_index);
// Evaluate if blocking a pagesize outofrange exception
if (ReturnBadRequestOnOutOfRange ?? options.PaginationDefaultBadRequestOnPageSizeOutOfRange)
{
var maxPageSize = MaxPageSize != -1 ? MaxPageSize : options.PaginationDefaultMaxPageSize;
logger.LogDebug("MaxPageSize allowed: {0}", maxPageSize);
if (maxPageSize > 0 && p_size.HasValue && p_size.Value > maxPageSize)
{
var ex = new BadRequest.Exception("KO_PAGE_SIZE_OUT_OF_RANGE");
ex.Description = FormatSystemMessage("Page Size {0} is greather than the maximum allowed ({1})", p_size.Value, maxPageSize);
throw ex;
}
}
int actual_p_index = p_index ?? 1;
int actual_p_size = p_size ?? (DefaultPageSize != -1 ? DefaultPageSize : options.PaginationDefaultPageSize);
logger.LogDebug("Actual page cursor: Index({0}), Size({1})", actual_p_size, actual_p_size);
// Set Pagination Cursor for the current request
context.HttpContext.Items[InternalConstants.PaginationCursorKey] = new PaginationCursor(actual_p_index, actual_p_size);
}
private static void ParsePageCursor(NexusatAspNetCoreOptions options, IQueryCollection query, out int?pageSize, out int?pageIndex)
{
StringValues values;
pageSize = pageIndex = null;
int _size, _index;
if (query.TryGetValue(options.PaginationPageSizeName, out values))
{
if (!int.TryParse(values[0], out _size))
{
var ex = new BadRequest.Exception("KO_BAD_PAGE_SIZE");
ex.Description = "Page Size is not a valid integer";
throw ex;
}
if (_size < 0)
{
var ex = new BadRequest.Exception("KO_BAD_PAGE_SIZE");
ex.Description = "Page Size must be a non negative integer";
throw ex;
}
pageSize = _size;
}
if (query.TryGetValue(options.PaginationPageIndexName, out values))
{
if (!int.TryParse(values[0], out _index))
{
var ex = new BadRequest.Exception("KO_BAD_PAGE_INDEX");
ex.Description = "Page Index is not a valid integer";
throw ex;
}
if (_index < 1)
{
var ex = new BadRequest.Exception("KO_BAD_PAGE_INDEX");
ex.Description = "Page Index must be a positive integer";
throw ex;
}
pageIndex = _index;
}
}
