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using System;
using System.Collections.Generic;
using System.IdentityModel.Claims;
using System.IdentityModel.Policy;
using System.Linq;
using System.Web;
using DotNetOpenAuth.OAuth.ChannelElements;

public class OAuthPrincipalAuthorizationPolicy : IAuthorizationPolicy {
	private readonly Guid uniqueId = Guid.NewGuid();
	private readonly OAuthPrincipal principal;

	/// <summary>
	/// Initializes a new instance of the <see cref="OAuthPrincipalAuthorizationPolicy"/> class.
	/// </summary>
	/// <param name="principal">The principal.</param>
	public OAuthPrincipalAuthorizationPolicy(OAuthPrincipal principal) {
		this.principal = principal;
	}

	#region IAuthorizationComponent Members

	/// <summary>
	/// Gets a unique ID for this instance.
	/// </summary>
	public string Id {
		get { return this.uniqueId.ToString(); }
	}

	#endregion

	#region IAuthorizationPolicy Members

	public ClaimSet Issuer {
		get { return ClaimSet.System; }
	}

	public bool Evaluate(EvaluationContext evaluationContext, ref object state) {
		evaluationContext.AddClaimSet(this, new DefaultClaimSet(Claim.CreateNameClaim(this.principal.Identity.Name)));
		evaluationContext.Properties["Principal"] = this.principal;
		return true;
	}

	#endregion
}