/// <summary>
/// Validates an object property
/// </summary>
/// <param name="prop">The property metadata</param>
/// <param name="value">The property object to validate</param>
/// <param name="entityPath">Path to the property object in the serviceDefinition</param>
/// <param name="metaData">The metadata associated with corresponding serviceDefinition</param>
/// <returns></returns>
private IEnumerable <ValidationMessage> ValidateProperty(PropertyInfo prop, object value, ObjectPath entityPath, RuleContext parentContext, ServiceDefinitionMetadata metaData)
{
// Uses the property name resolver to get the name to use in the path of messages
var propName = resolver(prop);
// Determine if anything about this property indicates that it shouldn't be traversed further
var shouldTraverseObject = prop.IsTraversableProperty();
// Create the context that's available to rules that validate this value
var ruleContext = prop.GetCustomAttribute <JsonExtensionDataAttribute>(true) == null
? parentContext.CreateChild(value, propName)
: parentContext.CreateChild(value, -1);
// Get any rules defined on this property and any defined as applying to the collection
var propertyRules = GetFilteredRules(prop.GetValidationRules(), metaData);
var collectionRules = GetFilteredRules(prop.GetValidationCollectionRules(), metaData);
// Validate the value of this property against any rules for it
var propertyMessages = propertyRules.SelectMany(r => r.GetValidationMessages(value, ruleContext));
// Recursively validate the property (e.g. its properties or any list/dictionary entries),
// passing any rules that apply to this collection)
var childrenMessages = RecursiveValidate(value, entityPath, ruleContext, collectionRules, metaData, shouldTraverseObject);
return(propertyMessages.Concat(childrenMessages));
}
/// <summary>
/// Recursively validates <paramref name="entity"/> by traversing all of its properties
/// </summary>
/// <param name="entity">The object to validate</param>
/// <param name="parentContext">The rule context of the object that <paramref name="entity"/> belongs to</param>
/// <param name="rules">The set of rules from the parent object to apply to <paramref name="entity"/></param>
/// <param name="metaData">The metadata associated with serviceDefinition to which <paramref name="entity"/> belongs to</param>
/// <param name="traverseProperties">Whether or not to traverse this <paramref name="entity"/>'s properties</param>
/// <returns></returns>
private IEnumerable <ValidationMessage> RecursiveValidate(object entity, ObjectPath entityPath, RuleContext parentContext, IEnumerable <Rule> rules, ServiceDefinitionMetadata metaData, bool traverseProperties = true)
{
var messages = Enumerable.Empty <ValidationMessage>();
if (entity == null)
{
return(messages);
}
// Ensure that the rules can be re-enumerated without re-evaluating the enumeration.
var collectionRules = rules.ToList();
var list = entity as IList;
var dictionary = entity as IDictionary;
if (traverseProperties && list != null)
{
// Recursively validate each list item and add the
// item index to the location of each validation message
var listMessages = list.SelectMany((item, index)
=> RecursiveValidate(item, entityPath.AppendIndex(index), parentContext.CreateChild(item, index), collectionRules, metaData));
messages = messages.Concat(listMessages);
}
else if (traverseProperties && dictionary != null)
{
// Dictionaries that don't provide any type info cannot be traversed, since it result in infinite iteration
var shouldTraverseEntries = dictionary.IsTraversableDictionary();
// Recursively validate each dictionary entry and add the entry
// key to the location of each validation message
var dictMessages = dictionary.SelectMany((key, value)
=> RecursiveValidate(value, entityPath.AppendProperty((string)key), parentContext.CreateChild(value, (string)key), collectionRules, metaData, shouldTraverseEntries));
messages = messages.Concat(dictMessages);
}
// If this is a class, validate its value and its properties.
else if (traverseProperties && entity.GetType().IsClass() && entity.GetType() != typeof(string))
{
// Validate each property of the object
var propertyMessages = entity.GetValidatableProperties()
.SelectMany(p => ValidateProperty(p, p.GetValue(entity), entityPath.AppendProperty(p.Name), parentContext, metaData));
messages = messages.Concat(propertyMessages);
}
// Validate the value of the object itself
var valueMessages = ValidateObjectValue(entity, collectionRules, parentContext, metaData);
return(messages.Concat(valueMessages));
}
/// <summary>
/// Validates an object value
/// </summary>
/// <param name="entity"></param>
/// <param name="collectionRules"></param>
/// <param name="parentContext"></param>
/// <param name="metaData">The metadata associated with corresponding serviceDefinition</param>
/// <returns></returns>
private IEnumerable <ValidationMessage> ValidateObjectValue(object entity,
IEnumerable <Rule> collectionRules, RuleContext parentContext,
ServiceDefinitionMetadata metaData)
{
// Get any rules defined for the class of the entity
var classRules = GetFilteredRules(entity.GetType().GetValidationRules(), metaData);
// Combine the class rules with any rules that apply to the collection that the entity is part of
classRules = collectionRules.Concat(classRules);
// Apply each rule for the entity
return(classRules.SelectMany(rule => rule.GetValidationMessages(entity, parentContext)));
}