using System;
using System.Net;

namespace HttpServer.Exceptions
{
    /// <summary>
    /// The request requires user authentication. The response MUST include a 
    /// WWW-Authenticate header field (section 14.47) containing a challenge 
    /// applicable to the requested resource. 
    /// 
    /// The client MAY repeat the request with a suitable Authorization header 
    /// field (section 14.8). If the request already included Authorization 
    /// credentials, then the 401 response indicates that authorization has been 
    /// refused for those credentials. If the 401 response contains the same challenge 
    /// as the prior response, and the user agent has already attempted authentication 
    /// at least once, then the user SHOULD be presented the entity that was given in the response, 
    /// since that entity might include relevant diagnostic information. 
    /// 
    /// HTTP access authentication is explained in rfc2617:
    /// http://www.ietf.org/rfc/rfc2617.txt
    /// 
    /// (description is taken from 
    /// http://www.submissionchamber.com/help-guides/error-codes.php#sec10.4.2)
    /// </summary>
    public class UnauthorizedException : HttpException
    {
        /// <summary>
        /// Create a new unauhtorized exception.
        /// </summary>
        /// <seealso cref="UnauthorizedException"/>
        public UnauthorizedException()
            : base(HttpStatusCode.Unauthorized, "The request requires user authentication.")
        {
            
        }

        /// <summary>
        /// Create a new unauhtorized exception.
        /// </summary>
        /// <param name="message">reason to why the request was unauthorized.</param>
        /// <param name="inner">inner exception</param>
        public UnauthorizedException(string message, Exception inner)
            : base(HttpStatusCode.Unauthorized, message, inner)
        {
        }

        /// <summary>
        /// Create a new unauhtorized exception.
        /// </summary>
        /// <param name="message">reason to why the request was unauthorized.</param>
        public UnauthorizedException(string message)
            : base(HttpStatusCode.Unauthorized, message)
        {
        }
    }
}