mcs/class/System/System.Net/CookieParser.cs

   1 //
   2 // System.Net.CookieParser
   3 //
   4 // Authors:
   5 //      Lawrence Pit (loz@cable.a2000.nl)
   6 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   7 //      Daniel Nauck    (dna(at)mono-project(dot)de)
   8 //
   9 // (c) 2002 Lawrence Pit
  10 // (c) 2003 Ximian, Inc. (http://www.ximian.com)
  11 // (c) 2008 Daniel Nauck
  12 //
  13
  14 //
  15 // Permission is hereby granted, free of charge, to any person obtaining
  16 // a copy of this software and associated documentation files (the
  17 // "Software"), to deal in the Software without restriction, including
  18 // without limitation the rights to use, copy, modify, merge, publish,
  19 // distribute, sublicense, and/or sell copies of the Software, and to
  20 // permit persons to whom the Software is furnished to do so, subject to
  21 // the following conditions:
  22 //
  23 // The above copyright notice and this permission notice shall be
  24 // included in all copies or substantial portions of the Software.
  25 //
  26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33 //
  34
  35 using System;
  36 using System.Collections;
  37 using System.Globalization;
  38
  39 namespace System.Net {
  40
  41         class CookieParser {
  42                 string header;
  43                 int pos;
  44                 int length;
  45
  46                 public CookieParser (string header) : this (header, 0)
  47                 {
  48                 }
  49
  50                 public CookieParser (string header, int position)
  51                 {
  52                         this.header = header;
  53                         this.pos = position;
  54                         this.length = header.Length;
  55                 }
  56
  57                 public bool GetNextNameValue (out string name, out string val)
  58                 {
  59                         name = null;
  60                         val = null;
  61
  62                         if (pos >= length)
  63                                 return false;
  64
  65                         name = GetCookieName ();
  66                         if (pos < header.Length && header [pos] == '=') {
  67                                 pos++;
  68                                 val = GetCookieValue ();
  69                         }
  70
  71                         if (pos < length && header [pos] == ';')
  72                                 pos++;
  73
  74                         return true;
  75                 }
  76
  77                 string GetCookieName ()
  78                 {
  79                         int k = pos;
  80                         while (k < length && Char.IsWhiteSpace (header [k]))
  81                                 k++;
  82
  83                         int begin = k;
  84                         while (k < length && header [k] != ';' &&  header [k] != '=')
  85                                 k++;
  86
  87                         pos = k;
  88                         return header.Substring (begin, k - begin).Trim ();
  89                 }
  90
  91                 string GetCookieValue ()
  92                 {
  93                         if (pos >= length)
  94                                 return null;
  95
  96                         int k = pos;
  97                         while (k < length && Char.IsWhiteSpace (header [k]))
  98                                 k++;
  99
 100                         int begin;
 101                         if (header [k] == '"'){
 102                                 int j;
 103                                 begin = ++k;
 104
 105                                 while (k < length && header [k] != '"')
 106                                         k++;
 107
 108                                 for (j = k; j < length && header [j] != ';'; j++)
 109                                         ;
 110                                 pos = j;
 111                         } else {
 112                                 begin = k;
 113                                 while (k < length && header [k] != ';')
 114                                         k++;
 115                                 pos = k;
 116                         }
 117
 118                         return header.Substring (begin, k - begin).Trim ();
 119                 }
 120
 121                 static string[] cookieExpiresFormats =
 122                         new string[] { "r",
 123                                         "ddd, dd'-'MMM'-'yyyy HH':'mm':'ss 'GMT'",
 124                                         "ddd, dd'-'MMM'-'yy HH':'mm':'ss 'GMT'" };
 125
 126                 static public DateTime TryParseCookieExpires (string value)
 127                 {
 128                         if (String.IsNullOrEmpty (value))
 129                                 return DateTime.MinValue;
 130
 131                         for (int i = 0; i < cookieExpiresFormats.Length; i++) {
 132                                 try {
 133                                         DateTime cookieExpiresUtc = DateTime.ParseExact (value, cookieExpiresFormats [i], CultureInfo.InvariantCulture);
 134
 135                                         //convert UTC/GMT time to local time
 136                                         cookieExpiresUtc = DateTime.SpecifyKind (cookieExpiresUtc, DateTimeKind.Utc);
 137                                         return TimeZone.CurrentTimeZone.ToLocalTime (cookieExpiresUtc);
 138                                 } catch {}
 139                         }
 140
 141                         //If we can't parse Expires, use cookie as session cookie (expires is DateTime.MinValue)
 142                         return DateTime.MinValue;
 143                 }
 144         }
 145 }
 146