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//-----------------------------------------------------------------------
// <copyright file="DateTimeEncoder.cs" company="Andrew Arnott">
// Copyright (c) Andrew Arnott. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OpenId.Extensions.ProviderAuthenticationPolicy {
using System;
using System.Globalization;
using DotNetOpenAuth.Messaging;
using DotNetOpenAuth.Messaging.Reflection;
/// <summary>
/// An encoder/decoder design for DateTimes that must conform to the PAPE spec.
/// </summary>
/// <remarks>
/// The timestamp MUST be formatted as specified in section 5.6 of [RFC3339] (Klyne, G. and C. Newman, “Date and Time on the Internet: Timestamps,” .), with the following restrictions:
/// * All times must be in the UTC timezone, indicated with a "Z".
/// * No fractional seconds are allowed
/// For example: 2005-05-15T17:11:51Z
/// </remarks>
internal class DateTimeEncoder : IMessagePartEncoder {
/// <summary>
/// An array of the date/time formats allowed by the PAPE extension.
/// </summary>
/// <remarks>
/// TODO: This array of formats is not yet a complete list.
/// </remarks>
private static readonly string[] PermissibleDateTimeFormats = { "yyyy-MM-ddTHH:mm:ssZ" };
#region IMessagePartEncoder Members
/// <summary>
/// Encodes the specified value.
/// </summary>
/// <param name="value">The value. Guaranteed to never be null.</param>
/// <returns>
/// The <paramref name="value"/> in string form, ready for message transport.
/// </returns>
public string Encode(object value) {
DateTime? dateTime = value as DateTime?;
if (dateTime.HasValue) {
return dateTime.Value.ToUniversalTimeSafe().ToString(PermissibleDateTimeFormats[0], CultureInfo.InvariantCulture);
} else {
return null;
}
}
/// <summary>
/// Decodes the specified value.
/// </summary>
/// <param name="value">The string value carried by the transport. Guaranteed to never be null, although it may be empty.</param>
/// <returns>
/// The deserialized form of the given string.
/// </returns>
/// <exception cref="FormatException">Thrown when the string value given cannot be decoded into the required object type.</exception>
public object Decode(string value) {
DateTime dateTime;
if (DateTime.TryParse(value, CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out dateTime) && dateTime.Kind == DateTimeKind.Utc) { // may be unspecified per our option above
return dateTime;
} else {
Logger.OpenId.ErrorFormat("Invalid format for message part: {0}", value);
return null;
}
}
#endregion
}
}
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