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//-----------------------------------------------------------------------
// <copyright file="IdentifierDiscoveryServices.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OpenId {
using System.Collections.Generic;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Threading;
using System.Threading.Tasks;
using DotNetOpenAuth.Configuration;
using DotNetOpenAuth.Logging;
using DotNetOpenAuth.Messaging;
using Validation;
/// <summary>
/// A service that can perform discovery on OpenID identifiers.
/// </summary>
internal class IdentifierDiscoveryServices {
/// <summary>
/// The RP or OP that is hosting these services.
/// </summary>
private readonly IOpenIdHost host;
/// <summary>
/// Backing field for the <see cref="DiscoveryServices"/> property.
/// </summary>
private readonly IList<IIdentifierDiscoveryService> discoveryServices = new List<IIdentifierDiscoveryService>(2);
/// <summary>
/// Initializes a new instance of the <see cref="IdentifierDiscoveryServices"/> class.
/// </summary>
/// <param name="host">The RP or OP that creates this instance.</param>
internal IdentifierDiscoveryServices(IOpenIdHost host) {
Requires.NotNull(host, "host");
this.host = host;
this.discoveryServices.AddRange(OpenIdElement.Configuration.RelyingParty.DiscoveryServices.CreateInstances(true, host.HostFactories));
}
/// <summary>
/// Gets the list of services that can perform discovery on identifiers given.
/// </summary>
public IList<IIdentifierDiscoveryService> DiscoveryServices {
get { return this.discoveryServices; }
}
/// <summary>
/// Performs discovery on the specified identifier.
/// </summary>
/// <param name="identifier">The identifier to discover services for.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>A non-null sequence of services discovered for the identifier.</returns>
public async Task<IEnumerable<IdentifierDiscoveryResult>> DiscoverAsync(Identifier identifier, CancellationToken cancellationToken) {
Requires.NotNull(identifier, "identifier");
IEnumerable<IdentifierDiscoveryResult> results = Enumerable.Empty<IdentifierDiscoveryResult>();
foreach (var discoverer in this.DiscoveryServices) {
var discoveryResults = await discoverer.DiscoverAsync(identifier, cancellationToken);
results = results.Concat(discoveryResults.Results.CacheGeneratedResults());
if (discoveryResults.AbortDiscoveryChain) {
Logger.OpenId.InfoFormat("Further discovery on '{0}' was stopped by the {1} discovery service.", identifier, discoverer.GetType().Name);
break;
}
}
// If any OP Identifier service elements were found, we must not proceed
// to use any Claimed Identifier services, per OpenID 2.0 sections 7.3.2.2 and 11.2.
// For a discussion on this topic, see
// http://groups.google.com/group/dotnetopenid/browse_thread/thread/4b5a8c6b2210f387/5e25910e4d2252c8
// Sometimes the IIdentifierDiscoveryService will automatically filter this for us, but
// just to be sure, we'll do it here as well.
if (!this.host.SecuritySettings.AllowDualPurposeIdentifiers) {
results = results.CacheGeneratedResults(); // avoid performing discovery repeatedly
var opIdentifiers = results.Where(result => result.ClaimedIdentifier == result.Protocol.ClaimedIdentifierForOPIdentifier);
var claimedIdentifiers = results.Where(result => result.ClaimedIdentifier != result.Protocol.ClaimedIdentifierForOPIdentifier);
results = opIdentifiers.Any() ? opIdentifiers : claimedIdentifiers;
}
return results;
}
}
}
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