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//-----------------------------------------------------------------------
// <copyright file="ProviderAssociationKeyStorage.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OpenId.Provider {
using System;
using System.Diagnostics.Contracts;
using DotNetOpenAuth.Messaging;
using DotNetOpenAuth.Messaging.Bindings;
/// <summary>
/// An association storage mechanism that stores the association secrets in a private store,
/// and returns randomly generated association handles to refer to these secrets.
/// </summary>
internal class ProviderAssociationKeyStorage : IProviderAssociationStore {
/// <summary>
/// The bucket to use when recording shared associations.
/// </summary>
internal const string SharedAssociationBucket = "https://localhost/dnoa/shared_associations";
/// <summary>
/// The bucket to use when recording private associations.
/// </summary>
internal const string PrivateAssociationBucket = "https://localhost/dnoa/private_associations";
/// <summary>
/// The backing crypto key store.
/// </summary>
private readonly ICryptoKeyStore cryptoKeyStore;
/// <summary>
/// Initializes a new instance of the <see cref="ProviderAssociationKeyStorage"/> class.
/// </summary>
/// <param name="cryptoKeyStore">The store where association secrets will be recorded.</param>
internal ProviderAssociationKeyStorage(ICryptoKeyStore cryptoKeyStore) {
Requires.NotNull(cryptoKeyStore, "cryptoKeyStore");
this.cryptoKeyStore = cryptoKeyStore;
}
/// <summary>
/// Stores an association and returns a handle for it.
/// </summary>
/// <param name="secret">The association secret.</param>
/// <param name="expiresUtc">The UTC time that the association should expire.</param>
/// <param name="privateAssociation">A value indicating whether this is a private association.</param>
/// <returns>
/// The association handle that represents this association.
/// </returns>
public string Serialize(byte[] secret, DateTime expiresUtc, bool privateAssociation) {
string handle;
this.cryptoKeyStore.StoreKey(
privateAssociation ? PrivateAssociationBucket : SharedAssociationBucket,
handle = OpenIdUtilities.GenerateRandomAssociationHandle(),
new CryptoKey(secret, expiresUtc));
return handle;
}
/// <summary>
/// Retrieves an association given an association handle.
/// </summary>
/// <param name="containingMessage">The OpenID message that referenced this association handle.</param>
/// <param name="isPrivateAssociation">A value indicating whether a private association is expected.</param>
/// <param name="handle">The association handle.</param>
/// <returns>
/// An association instance, or <c>null</c> if the association has expired or the signature is incorrect (which may be because the OP's symmetric key has changed).
/// </returns>
/// <exception cref="ProtocolException">Thrown if the association is not of the expected type.</exception>
public Association Deserialize(IProtocolMessage containingMessage, bool isPrivateAssociation, string handle) {
var key = this.cryptoKeyStore.GetKey(isPrivateAssociation ? PrivateAssociationBucket : SharedAssociationBucket, handle);
if (key != null) {
return Association.Deserialize(handle, key.ExpiresUtc, key.Key);
}
return null;
}
}
}
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