/Dependencies/log4net/Util/PatternStringConverters/UserNamePatternConverter.cs

 1#region Apache License
 2//
 3// Licensed to the Apache Software Foundation (ASF) under one or more 
 4// contributor license agreements. See the NOTICE file distributed with
 5// this work for additional information regarding copyright ownership. 
 6// The ASF licenses this file to you under the Apache License, Version 2.0
 7// (the "License"); you may not use this file except in compliance with 
 8// the License. You may obtain a copy of the License at
 9//
10// http://www.apache.org/licenses/LICENSE-2.0
11//
12// Unless required by applicable law or agreed to in writing, software
13// distributed under the License is distributed on an "AS IS" BASIS,
14// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15// See the License for the specific language governing permissions and
16// limitations under the License.
17//
18#endregion
19
20using System;
21using System.Text;
22using System.IO;
23
24using log4net.Util;
25
26namespace log4net.Util.PatternStringConverters
27{
28	/// <summary>
29	/// Write the current threads username to the output
30	/// </summary>
31	/// <remarks>
32	/// <para>
33	/// Write the current threads username to the output writer
34	/// </para>
35	/// </remarks>
36	/// <author>Nicko Cadell</author>
37	internal sealed class UserNamePatternConverter : PatternConverter 
38	{
39		/// <summary>
40		/// Write the current threads username to the output
41		/// </summary>
42		/// <param name="writer">the writer to write to</param>
43		/// <param name="state">null, state is not set</param>
44		/// <remarks>
45		/// <para>
46		/// Write the current threads username to the output <paramref name="writer"/>.
47		/// </para>
48		/// </remarks>
49		override protected void Convert(TextWriter writer, object state) 
50		{
51#if (NETCF || SSCLI)
52			// On compact framework there's no notion of current Windows user
53			writer.Write( SystemInfo.NotAvailableText );
54#else
55			try
56			{
57				System.Security.Principal.WindowsIdentity windowsIdentity = null;
58				windowsIdentity = System.Security.Principal.WindowsIdentity.GetCurrent();
59				if (windowsIdentity != null && windowsIdentity.Name != null)
60				{
61					writer.Write( windowsIdentity.Name );
62				}
63			}
64			catch(System.Security.SecurityException)
65			{
66				// This security exception will occur if the caller does not have 
67				// some undefined set of SecurityPermission flags.
68				LogLog.Debug(declaringType, "Security exception while trying to get current windows identity. Error Ignored.");
69
70				writer.Write( SystemInfo.NotAvailableText );
71			}
72#endif
73		}
74
75	    #region Private Static Fields
76
77	    /// <summary>
78	    /// The fully qualified type of the UserNamePatternConverter class.
79	    /// </summary>
80	    /// <remarks>
81	    /// Used by the internal logger to record the Type of the
82	    /// log message.
83	    /// </remarks>
84	    private readonly static Type declaringType = typeof(UserNamePatternConverter);
85
86	    #endregion Private Static Fields
87	}
88}