private IEnumerable<Teaser> GetEntityItems(EntityModel entity)
{
List<Teaser> res = new List<Teaser>();
//1. Check if entity is a teaser, if add it
if (entity is Teaser)
{
res.Add((Teaser)entity);
}
else
{
//2. Second check if entity type is (semantically) a list, and if so, get its list items
List<Teaser> items = GetTeaserListFromSemantics(entity);
if (items != null)
{
res = items;
}
else
{
//3. Last resort, try to find some suitable properties using reflection
Teaser teaser = new Teaser();
foreach (PropertyInfo pi in entity.GetType().GetProperties())
{
switch (pi.Name)
{
case "Headline":
case "Name":
teaser.Headline = pi.GetValue(entity) as String;
break;
case "Date":
DateTime? date = pi.GetValue(entity) as DateTime?;
if (date != null)
teaser.Date = date;
break;
case "Description":
teaser.Text = pi.GetValue(entity) as String;
break;
case "Link":
teaser.Link = pi.GetValue(entity) as Link;
break;
case "Url":
string url = pi.GetValue(entity) as String;
if (url != null)
teaser.Link = new Link { Url = url };
break;
}
}
if (teaser.Headline != null || teaser.Text != null || teaser.Link != null)
{
res.Add(teaser);
}
}
}
return res;
}
/// <summary>
/// Maps Form data (for an HTTP POST request) to properies of a given Entity Model and performs basic validation.
/// </summary>
/// <param name="model">The Entity Model to map the form data to.</param>
/// <returns><c>true</c> if there is any form data to be mapped.</returns>
protected bool MapRequestFormData(EntityModel model)
{
if (Request.HttpMethod != "POST")
{
return false;
}
// CSRF protection: If the anti CSRF cookie is present, a matching token must be in the form data too.
const string antiCsrfToken = "__RequestVerificationToken";
if (Request.Cookies[antiCsrfToken] != null)
{
AntiForgery.Validate();
}
Type modelType = model.GetType();
foreach (string formField in Request.Form)
{
if (formField == antiCsrfToken)
{
// This is not a form field, but the anti CSRF token (already validated above).
continue;
}
PropertyInfo modelProperty = modelType.GetProperty(formField);
if (modelProperty == null)
{
Log.Debug("Model [{0}] has no property for form field '{1}'", model, formField);
continue;
}
string formFieldValue = Request.Form[formField];
ValidationAttribute validationAttr = modelProperty.GetCustomAttribute<ValidationAttribute>();
if (validationAttr != null)
{
try
{
validationAttr.Validate(formFieldValue, formField);
}
catch (ValidationException ex)
{
string validationMessage = ResolveValidationMessage(ex.Message, model);
Log.Debug("Validation of property '{0}' failed: {1}", formField, validationMessage);
ModelState.AddModelError(formField, validationMessage);
continue;
}
}
try
{
if (modelProperty.PropertyType == typeof (bool))
{
// The @Html.CheckBoxFor method includes a hidden field with the original checkbox state, resulting in two boolean values (comma separated)
formFieldValue = formFieldValue.Split(',')[0];
}
modelProperty.SetValue(model, Convert.ChangeType(formFieldValue, modelProperty.PropertyType));
}
catch (Exception ex)
{
Log.Debug("Failed to set Model [{0}] property '{1}' to value obtained from form data: '{2}'. {3}", model, formField, formFieldValue, ex.Message);
ModelState.AddModelError(formField, ex.Message);
}
}
return true;
}
private List<Teaser> GetTeaserListFromSemantics(EntityModel entity)
{
Type type = entity.GetType();
bool isList = false;
foreach (object attr in type.GetCustomAttributes(true))
{
if (attr is SemanticEntityAttribute)
{
SemanticEntityAttribute semantics = (SemanticEntityAttribute)attr;
isList = semantics.Vocab == ViewModel.SchemaOrgVocabulary && semantics.EntityName == "ItemList";
if (isList)
{
break;
}
}
}
if (isList)
{
foreach(PropertyInfo pi in type.GetProperties())
{
if (pi.PropertyType == typeof(List<Teaser>))
{
return pi.GetValue(entity) as List<Teaser>;
}
}
}
return null;
}
