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using System.Collections.Generic;
using System.Collections.Specialized;
using System.Globalization;
using System.Threading;
namespace System.Web.Mvc
{
public class NameValueCollectionValueProvider : IValueProvider, IUnvalidatedValueProvider, IEnumerableValueProvider
{
private readonly Lazy<PrefixContainer> _prefixContainer;
private readonly Dictionary<string, ValueProviderResultPlaceholder> _values = new Dictionary<string, ValueProviderResultPlaceholder>(StringComparer.OrdinalIgnoreCase);
public NameValueCollectionValueProvider(NameValueCollection collection, CultureInfo culture)
: this(collection, unvalidatedCollection: null, culture: culture)
{
}
public NameValueCollectionValueProvider(NameValueCollection collection, NameValueCollection unvalidatedCollection, CultureInfo culture)
{
if (collection == null)
{
throw new ArgumentNullException("collection");
}
unvalidatedCollection = unvalidatedCollection ?? collection;
// Need to read keys from the unvalidated collection, as M.W.I's granular request validation is a bit touchy
// and validated entries at the time the key or value is looked at. For example, GetKey() will throw if the
// value fails request validation, even though the value's not being looked at (M.W.I can't tell the difference).
_prefixContainer = new Lazy<PrefixContainer>(() => new PrefixContainer(unvalidatedCollection.AllKeys), isThreadSafe: true);
foreach (string key in unvalidatedCollection)
{
if (key != null)
{
// need to look up values lazily, as eagerly looking at the collection might trigger validation
_values[key] = new ValueProviderResultPlaceholder(key, collection, unvalidatedCollection, culture);
}
}
}
public virtual bool ContainsPrefix(string prefix)
{
return _prefixContainer.Value.ContainsPrefix(prefix);
}
public virtual ValueProviderResult GetValue(string key)
{
return GetValue(key, skipValidation: false);
}
public virtual ValueProviderResult GetValue(string key, bool skipValidation)
{
if (key == null)
{
throw new ArgumentNullException("key");
}
ValueProviderResultPlaceholder placeholder;
_values.TryGetValue(key, out placeholder);
if (placeholder == null)
{
return null;
}
else
{
return (skipValidation) ? placeholder.UnvalidatedResult : placeholder.ValidatedResult;
}
}
public virtual IDictionary<string, string> GetKeysFromPrefix(string prefix)
{
return _prefixContainer.Value.GetKeysFromPrefix(prefix);
}
// Placeholder that can store a validated (in relation to request validation) or unvalidated
// ValueProviderResult for a given key.
private sealed class ValueProviderResultPlaceholder
{
private readonly Lazy<ValueProviderResult> _validatedResultPlaceholder;
private readonly Lazy<ValueProviderResult> _unvalidatedResultPlaceholder;
public ValueProviderResultPlaceholder(string key, NameValueCollection validatedCollection, NameValueCollection unvalidatedCollection, CultureInfo culture)
{
_validatedResultPlaceholder = new Lazy<ValueProviderResult>(() => GetResultFromCollection(key, validatedCollection, culture), LazyThreadSafetyMode.None);
_unvalidatedResultPlaceholder = new Lazy<ValueProviderResult>(() => GetResultFromCollection(key, unvalidatedCollection, culture), LazyThreadSafetyMode.None);
}
public ValueProviderResult ValidatedResult
{
get { return _validatedResultPlaceholder.Value; }
}
public ValueProviderResult UnvalidatedResult
{
get { return _unvalidatedResultPlaceholder.Value; }
}
private static ValueProviderResult GetResultFromCollection(string key, NameValueCollection collection, CultureInfo culture)
{
string[] rawValue = collection.GetValues(key);
string attemptedValue = collection[key];
return new ValueProviderResult(rawValue, attemptedValue, culture);
}
}
}
}
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