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//-----------------------------------------------------------------------
// <copyright file="OpenIdXrdsHelper.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OpenId {
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Linq;
using System.Text;
using DotNetOpenAuth.Xrds;
/// <summary>
/// Utility methods for working with XRDS documents.
/// </summary>
internal static class OpenIdXrdsHelper {
/// <summary>
/// Finds the Relying Party return_to receiving endpoints.
/// </summary>
/// <param name="xrds">The XrdsDocument instance to use in this process.</param>
/// <returns>A sequence of Relying Party descriptors for the return_to endpoints.</returns>
/// <remarks>
/// This is useful for Providers to send unsolicited assertions to Relying Parties,
/// or for Provider's to perform RP discovery/verification as part of authentication.
/// </remarks>
internal static IEnumerable<RelyingPartyEndpointDescription> FindRelyingPartyReceivingEndpoints(this XrdsDocument xrds) {
Requires.NotNull(xrds, "xrds");
Contract.Ensures(Contract.Result<IEnumerable<RelyingPartyEndpointDescription>>() != null);
return from service in xrds.FindReturnToServices()
from uri in service.UriElements
select new RelyingPartyEndpointDescription(uri.Uri, service.TypeElementUris);
}
/// <summary>
/// Finds the icons the relying party wants an OP to display as part of authentication,
/// per the UI extension spec.
/// </summary>
/// <param name="xrds">The XrdsDocument to search.</param>
/// <returns>A sequence of the icon URLs in preferred order.</returns>
internal static IEnumerable<Uri> FindRelyingPartyIcons(this XrdsDocument xrds) {
Requires.NotNull(xrds, "xrds");
Contract.Ensures(Contract.Result<IEnumerable<Uri>>() != null);
return from xrd in xrds.XrdElements
from service in xrd.OpenIdRelyingPartyIcons
from uri in service.UriElements
select uri.Uri;
}
/// <summary>
/// Enumerates the XRDS service elements that describe OpenID Relying Party return_to URLs
/// that can receive authentication assertions.
/// </summary>
/// <param name="xrds">The XrdsDocument instance to use in this process.</param>
/// <returns>A sequence of service elements.</returns>
private static IEnumerable<ServiceElement> FindReturnToServices(this XrdsDocument xrds) {
Requires.NotNull(xrds, "xrds");
Contract.Ensures(Contract.Result<IEnumerable<ServiceElement>>() != null);
return from xrd in xrds.XrdElements
from service in xrd.OpenIdRelyingPartyReturnToServices
select service;
}
}
}
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