/// <summary>
/// Get an individual entity
/// </summary>
/// <param name="id"></param>
/// <param name="parentid"></param>
/// <returns>An individual entity</returns>
/// <exception cref="EntityOperationException"></exception>
/// <exception cref="EntityDoesNotExistException"></exception>
/// <exception cref="UnauthorizedOperationException"></exception>
/// <exception cref="EntityValidationException"></exception>
protected virtual async Task <IActionResult> GetEntity <TViewModel>(string id, string parentid = "")
where TViewModel : class, IViewModel <T, TViewModel>, new()
{
T entity = null;
TViewModel entityView = new TViewModel();
Guid parentGuid = Guid.Empty;
if (!string.IsNullOrEmpty(parentid))
{
parentGuid = new Guid(parentid);
}
entity = readRepository.GetOne(new Guid(id), parentGuid);
if (entity == null)
{
ModelState.AddModelError("GetData", "Record does not exist or you do not have authorized access.");
return(BadRequest(ModelState));
}
else
{
entityView = entityView.Map(entity);
}
string timeStamp = "\"" + Convert.ToBase64String(entity.Timestamp) + "\"";
if (Request.Headers.ContainsKey("if-none-match"))
{
string etag = Request.Headers["if-none-match"];
if (!string.IsNullOrEmpty(etag) && etag.Equals(timeStamp, StringComparison.InvariantCultureIgnoreCase))
{
return(StatusCode(304)); //not modified if ETag is same as current timestamp
}
}
try
{
Response.Headers.Add("ETag", timeStamp);
}
catch
{
return(Ok(entityView));
}
return(Ok(entityView));
}