/// <summary>
/// Constructor.
/// Builds a new "auth" element with the given XML representation
/// </summary>
/// <param name="xml">The XML representation of this element</param>
public AuthenticationElement(XmlNode xml) : base(xml)
{
if(xml.FirstChild.Attributes["mechanism"] == null)
throw new OpenXMPPException("The server is not sending standard SASL authentication elements! I cann't determine an authentication mechanism");
// Parse authorization mechanism from XML
switch(xml.FirstChild.Attributes["mechanism"].Value)
{
case "DIGEST-MD5":
this.mechanism = SaslAuthenticationMechanism.DIGEST_MD5;
break;
case "PLAIN":
this.mechanism = SaslAuthenticationMechanism.PLAIN;
break;
default:
this.mechanism = SaslAuthenticationMechanism.UNKNOWN;
break;
}
// Parse encoded username and password from XML
string authStr = Encoding.ASCII.GetString(Convert.FromBase64String(xml.InnerText));
string[] authParams = authStr.Split('@', '\x00');
this.domain = authParams[1];
this.username = authParams[2];
this.password = authParams[3];
}
/// <summary>
/// Constructor.
/// Builds a new AuthorizationStanza object with the given xml. Additional parameters are to avoid parsing overhead.
/// </summary>
/// <param name="xml">XML representation of this stanza.</param>
/// <param name="mechanism">The SASL authorization mechanism specified in this stanza.</param>
/// <param name="domain">The user's authorization domain.</param>
/// <param name="username">The user's name.</param>
/// <param name="password">The user's password.</param>
public AuthenticationElement(XmlNode xml, SaslAuthenticationMechanism mechanism, string domain, string username, string password) : base(xml)
{
this.mechanism = mechanism;
this.domain = domain;
this.username = username;
this.password = password;
}
/// <summary>
/// Creates a new stream element for user authentication.
/// </summary>
/// <param name="mech">The SASL authentication mechanism to use.</param>
/// <param name="domain">The user's authentication domain (for PLAIN authentication)</param>
/// <param name="username">The user's name (for PLAIN authentication)</param>
/// <param name="password">The user's password (for PLAIN authentication)</param>
/// <returns>A new authorization stanza for the given SASL authentication mechanism.</returns>
public static AuthenticationElement GetAuthenticationElement(SaslAuthenticationMechanism mech, string domain, string username, string password)
{
StringWriter xmlString = new StringWriter();
XmlTextWriter writer = new XmlTextWriter(xmlString);
writer.WriteStartElement("auth");
writer.WriteAttributeString("xmlns", SASL_NAMESPACE);
switch(mech)
{
case SaslAuthenticationMechanism.DIGEST_MD5:
writer.WriteAttributeString("mechanism", "DIGEST-MD5");
break;
case SaslAuthenticationMechanism.PLAIN:
writer.WriteAttributeString("mechanism", "PLAIN");
string authStr = string.Format("{0}@{1}\x00{2}\x00{3}", username, domain, username, password);
byte[] bytes = Encoding.UTF8.GetBytes(authStr);
writer.WriteBase64(bytes, 0, bytes.Length);
break;
default:
throw new OpenXMPPException("Cannot create authorization stanza for mechanism "+mech+".");
}
writer.WriteEndElement();
XmlDocument xml = new XmlDocument();
xml.LoadXml(xmlString.ToString());
return new AuthenticationElement(xml.DocumentElement, mech, domain, username, password);
}
