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//-----------------------------------------------------------------------
// <copyright file="NonceMemoryStore.cs" company="Andrew Arnott">
// Copyright (c) Andrew Arnott. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOAuth.Messaging.Bindings {
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using DotNetOAuth.Messaging.Bindings;
/// <summary>
/// An in-memory nonce store. Useful for single-server web applications.
/// NOT for web farms.
/// </summary>
internal class NonceMemoryStore : INonceStore {
/// <summary>
/// The maximum age a message can be before it is discarded.
/// </summary>
/// <remarks>
/// This is useful for knowing how long used nonces must be retained.
/// </remarks>
private readonly TimeSpan maximumMessageAge;
/// <summary>
/// Initializes a new instance of the <see cref="NonceMemoryStore"/> class.
/// </summary>
/// <param name="maximumMessageAge">The maximum age a message can be before it is discarded.</param>
internal NonceMemoryStore(TimeSpan maximumMessageAge) {
this.maximumMessageAge = maximumMessageAge;
}
#region INonceStore Members
/// <summary>
/// Stores a given nonce and timestamp.
/// </summary>
/// <param name="nonce">
/// A series of random characters.
/// </param>
/// <param name="timestamp">
/// The timestamp that together with the nonce string make it unique.
/// The timestamp may also be used by the data store to clear out old nonces.
/// </param>
/// <returns>
/// True if the nonce+timestamp (combination) was not previously in the database.
/// False if the nonce was stored previously with the same timestamp.
/// </returns>
/// <remarks>
/// The nonce must be stored for no less than the maximum time window a message may
/// be processed within before being discarded as an expired message.
/// If the binding element is applicable to your channel, this expiration window
/// is retrieved or set using the
/// <see cref="StandardExpirationBindingElement.MaximumMessageAge"/> property.
/// </remarks>
public bool StoreNonce(string nonce, DateTime timestamp) {
if (timestamp.ToUniversalTime() + this.maximumMessageAge < DateTime.UtcNow) {
// The expiration binding element should have taken care of this, but perhaps
// it's at the boundary case. We should fail just to be safe.
return false;
}
// TODO: implement actual nonce checking.
Logger.Warn("Nonce checking not implemented yet.");
return true;
}
#endregion
}
}
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