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namespace System.Web.ModelBinding {
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Threading;
public sealed class CookieValueProvider : IValueProvider, IUnvalidatedValueProvider {
private readonly CultureInfo _culture;
private readonly PrefixContainer _prefixes;
private readonly Dictionary<string, ValueProviderResultPlaceholder> _values = new Dictionary<string, ValueProviderResultPlaceholder>(StringComparer.OrdinalIgnoreCase);
private readonly HttpCookieCollection _validatedCollection;
private readonly HttpCookieCollection _unvalidatedCollection;
public CookieValueProvider(ModelBindingExecutionContext modelBindingExecutionContext)
: this(modelBindingExecutionContext, modelBindingExecutionContext.HttpContext.Request.Unvalidated) {
}
internal CookieValueProvider(ModelBindingExecutionContext modelBindingExecutionContext, UnvalidatedRequestValuesBase unvalidatedValues)
: this(modelBindingExecutionContext.HttpContext.Request.Cookies, unvalidatedValues.Cookies, CultureInfo.CurrentCulture) {
}
internal CookieValueProvider(HttpCookieCollection collection, HttpCookieCollection unvalidatedCollection, CultureInfo culture) {
if (collection == null) {
throw new ArgumentNullException("collection");
}
_culture = culture;
_prefixes = new PrefixContainer(collection.Keys.Cast<string>());
_validatedCollection = collection;
_unvalidatedCollection = unvalidatedCollection ?? collection;
foreach (string key in collection) {
if (key != null) {
_values[key] = new ValueProviderResultPlaceholder(key, this);
}
}
}
public bool ContainsPrefix(string prefix) {
if (prefix == null) {
throw new ArgumentNullException("prefix");
}
return _prefixes.ContainsPrefix(prefix);
}
public ValueProviderResult GetValue(string key) {
return GetValue(key, skipValidation: false);
}
public 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;
}
}
// Placeholder that can store a validated (in relation to request validation) or unvalidated
// ValueProviderResult for a given key.
private sealed class ValueProviderResultPlaceholder {
private readonly Func<ValueProviderResult> _validatedResultAccessor;
private readonly Func<ValueProviderResult> _unvalidatedResultAccessor;
private ValueProviderResult _validatedResult;
private ValueProviderResult _unvalidatedResult;
public ValueProviderResultPlaceholder(string key, CookieValueProvider valueProvider) {
_validatedResultAccessor = () => GetResultFromCollection(key, valueProvider, useValidatedCollection: true);
_unvalidatedResultAccessor = () => GetResultFromCollection(key, valueProvider, useValidatedCollection: false);
}
private static ValueProviderResult GetResultFromCollection(string key, CookieValueProvider valueProvider, bool useValidatedCollection) {
HttpCookieCollection collection = (useValidatedCollection) ? valueProvider._validatedCollection : valueProvider._unvalidatedCollection;
string value = collection[key].Value;
return new ValueProviderResult(value, value, valueProvider._culture);
}
public ValueProviderResult ValidatedResult {
get { return LazyInitializer.EnsureInitialized(ref _validatedResult, _validatedResultAccessor); }
}
public ValueProviderResult UnvalidatedResult {
get { return LazyInitializer.EnsureInitialized(ref _unvalidatedResult, _unvalidatedResultAccessor); }
}
}
}
}
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