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//-----------------------------------------------------------------------
// <copyright file="DuplicateRequestedHostsComparer.cs" company="Andrew Arnott">
// Copyright (c) Andrew Arnott. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OpenId.RelyingParty {
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
/// <summary>
/// An authentication request comparer that judges equality solely on the OP endpoint hostname.
/// </summary>
internal class DuplicateRequestedHostsComparer : IEqualityComparer<IAuthenticationRequest> {
/// <summary>
/// The singleton instance of this comparer.
/// </summary>
private static IEqualityComparer<IAuthenticationRequest> instance = new DuplicateRequestedHostsComparer();
/// <summary>
/// Prevents a default instance of the <see cref="DuplicateRequestedHostsComparer"/> class from being created.
/// </summary>
private DuplicateRequestedHostsComparer() {
}
/// <summary>
/// Gets the singleton instance of this comparer.
/// </summary>
internal static IEqualityComparer<IAuthenticationRequest> Instance {
get { return instance; }
}
#region IEqualityComparer<IAuthenticationRequest> Members
/// <summary>
/// Determines whether the specified objects are equal.
/// </summary>
/// <param name="x">The first object to compare.</param>
/// <param name="y">The second object to compare.</param>
/// <returns>
/// true if the specified objects are equal; otherwise, false.
/// </returns>
public bool Equals(IAuthenticationRequest x, IAuthenticationRequest y) {
if (x == null && y == null) {
return true;
}
if (x == null || y == null) {
return false;
}
// We'll distinguish based on the host name only, which
// admittedly is only a heuristic, but if we remove one that really wasn't a duplicate, well,
// this multiple OP attempt thing was just a convenience feature anyway.
return string.Equals(x.Provider.Uri.Host, y.Provider.Uri.Host, StringComparison.OrdinalIgnoreCase);
}
/// <summary>
/// Returns a hash code for the specified object.
/// </summary>
/// <param name="obj">The <see cref="T:System.Object"/> for which a hash code is to be returned.</param>
/// <returns>A hash code for the specified object.</returns>
/// <exception cref="T:System.ArgumentNullException">
/// The type of <paramref name="obj"/> is a reference type and <paramref name="obj"/> is null.
/// </exception>
public int GetHashCode(IAuthenticationRequest obj) {
return obj.Provider.Uri.Host.GetHashCode();
}
#endregion
}
}
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