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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Net.Http.Formatting;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
namespace System.Net.Http
{
/// <summary>
/// Extension methods to allow strongly typed objects to be read from the query component of <see cref="Uri"/> instances.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public static class UriExtensions
{
/// <summary>
/// Parses the query portion of the specified <see cref="Uri"/>.
/// </summary>
/// <param name="address">The <see cref="Uri"/> instance from which to read.</param>
/// <returns>A <see cref="NameValueCollection"/> containing the parsed result.</returns>
public static NameValueCollection ParseQueryString(this Uri address)
{
if (address == null)
{
throw new ArgumentNullException("address");
}
return new FormDataCollection(address).ReadAsNameValueCollection();
}
/// <summary>
/// Reads HTML form URL encoded data provided in the <see cref="Uri"/> query component as a <see cref="JObject"/> object.
/// </summary>
/// <param name="address">The <see cref="Uri"/> instance from which to read.</param>
/// <param name="value">An object to be initialized with this instance or null if the conversion cannot be performed.</param>
/// <returns><c>true</c> if the query component can be read as <see cref="JObject"/>; otherwise <c>false</c>.</returns>
public static bool TryReadQueryAsJson(this Uri address, out JObject value)
{
if (address == null)
{
throw new ArgumentNullException("address");
}
IEnumerable<KeyValuePair<string, string>> query = new FormDataCollection(address);
return FormUrlEncodedJson.TryParse(query, out value);
}
/// <summary>
/// Reads HTML form URL encoded data provided in the <see cref="Uri"/> query component as an <see cref="Object"/> of the given <paramref name="type"/>.
/// </summary>
/// <param name="address">The <see cref="Uri"/> instance from which to read.</param>
/// <param name="type">The type of the object to read.</param>
/// <param name="value">An object to be initialized with this instance or null if the conversion cannot be performed.</param>
/// <returns><c>true</c> if the query component can be read as the specified type; otherwise <c>false</c>.</returns>
[SuppressMessage("Microsoft.Design", "CA1007:UseGenericsWhereAppropriate", Justification = "This is the non-generic version.")]
public static bool TryReadQueryAs(this Uri address, Type type, out object value)
{
if (address == null)
{
throw new ArgumentNullException("address");
}
if (type == null)
{
throw new ArgumentNullException("type");
}
IEnumerable<KeyValuePair<string, string>> query = new FormDataCollection(address);
JObject jsonObject;
if (FormUrlEncodedJson.TryParse(query, out jsonObject))
{
using (JTokenReader jsonReader = new JTokenReader(jsonObject))
{
value = new JsonSerializer().Deserialize(jsonReader, type);
}
return true;
}
value = null;
return false;
}
/// <summary>
/// Reads HTML form URL encoded data provided in the <see cref="Uri"/> query component as an <see cref="Object"/> of type <typeparamref name="T"/>.
/// </summary>
/// <typeparam name="T">The type of the object to read.</typeparam>
/// <param name="address">The <see cref="Uri"/> instance from which to read.</param>
/// <param name="value">An object to be initialized with this instance or null if the conversion cannot be performed.</param>
/// <returns><c>true</c> if the query component can be read as the specified type; otherwise <c>false</c>.</returns>
[SuppressMessage("Microsoft.Design", "CA1004:GenericMethodsShouldProvideTypeParameter", Justification = "The T represents the output parameter, not an input parameter.")]
public static bool TryReadQueryAs<T>(this Uri address, out T value)
{
if (address == null)
{
throw new ArgumentNullException("address");
}
IEnumerable<KeyValuePair<string, string>> query = new FormDataCollection(address);
JObject jsonObject;
if (FormUrlEncodedJson.TryParse(query, out jsonObject))
{
value = jsonObject.ToObject<T>();
return true;
}
value = default(T);
return false;
}
}
}
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