HttpCookie.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / HttpCookie.cs / 2 / HttpCookie.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 * HttpCookie - collection + name + path 
 *
 * Copyright (c) 1998 Microsoft Corporation 
 */

namespace System.Web {
    using System.Text; 
    using System.Collections;
    using System.Collections.Specialized; 
    using System.Globalization; 
    using System.Security.Permissions;
    using System.Web.Configuration; 
    using System.Web.Management;


    ///  
    ///    
    ///       Provides a type-safe way 
    ///       to access multiple HTTP cookies. 
    ///    
    ///  
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public sealed class HttpCookie {
        private String _name;
        private String _path = "/"; 
        private bool _secure;
        private bool _httpOnly; 
        private String _domain; 
        private bool _expirationSet;
        private DateTime _expires; 
        private String _stringValue;
        private HttpValueCollection _multiValue;
        private bool _changed;
        private bool _added; 

        internal HttpCookie() { 
            _changed = true; 
        }
 
        /*
         * Constructor - empty cookie with name
         */
 
        /// 
        ///     
        ///       Initializes a new instance of the  
        ///       class.
        ///     
        /// 
        public HttpCookie(String name) {
            _name = name;
 
            SetDefaultsFromConfig();
            _changed = true; 
        } 

        /* 
         * Constructor - cookie with name and value
         */

        ///  
        ///    
        ///       Initializes a new instance of the  
        ///       class. 
        ///    
        ///  
        public HttpCookie(String name, String value) {
            _name = name;
            _stringValue = value;
 
            SetDefaultsFromConfig();
            _changed = true; 
        } 

        private void SetDefaultsFromConfig() { 
            HttpCookiesSection config = RuntimeConfig.GetConfig().HttpCookies;
            _secure = config.RequireSSL;
            _httpOnly = config.HttpOnlyCookies;
 
            if (config.Domain != null && config.Domain.Length > 0)
                _domain = config.Domain; 
        } 

        /* 
         * Whether the cookie contents have changed
         */
        internal bool Changed {
            get { return _changed; } 
            set { _changed = value; }
        } 
 
        /*
         * Whether the cookie has been added 
         */
        internal bool Added {
            get { return _added; }
            set { _added = value; } 
        }
 
        /* 
         * Cookie name
         */ 

        /// 
        ///    
        ///       Gets 
        ///       or sets the name of cookie.
        ///     
        ///  
        public String Name {
            get { return _name;} 
            set {
                _name = value;
                _changed = true;
            } 
        }
 
        /* 
         * Cookie path
         */ 

        /// 
        ///    
        ///       Gets or sets the URL prefix to transmit with the 
        ///       current cookie.
        ///     
        ///  
        public String Path {
            get { return _path;} 
            set {
                _path = value;
                _changed = true;
            } 
        }
 
        /* 
         * 'Secure' flag
         */ 

        /// 
        ///    
        ///       Indicates whether the cookie should be transmitted only over HTTPS. 
        ///    
        ///  
        public bool Secure { 
            get { return _secure;}
            set { 
                _secure = value;
                _changed = true;
            }
        } 

        ///  
        ///     
        ///       Indicates whether the cookie should have HttpOnly attribute
        ///     
        /// 
        public bool HttpOnly {
            get { return _httpOnly;}
            set { 
                _httpOnly = value;
                _changed = true; 
            } 
        }
 
        /*
         * Cookie domain
         */
 
        /// 
        ///     
        ///       Restricts domain cookie is to be used with. 
        ///    
        ///  
        public String Domain {
            get { return _domain;}
            set {
                _domain = value; 
                _changed = true;
            } 
        } 

        /* 
         * Cookie expiration
         */

        ///  
        ///    
        ///       Expiration time for cookie (in minutes). 
        ///     
        /// 
        public DateTime Expires { 
            get {
                return(_expirationSet ? _expires : DateTime.MinValue);
            }
 
            set {
                _expires = value; 
                _expirationSet = true; 
                _changed = true;
            } 
        }

        /*
         * Cookie value as string 
         */
 
        ///  
        ///    
        ///       Gets 
        ///       or
        ///       sets an individual cookie value.
        ///    
        ///  
        public String Value {
            get { 
                if (_multiValue != null) 
                    return _multiValue.ToString(false);
                else 
                    return _stringValue;
            }

            set { 
                if (_multiValue != null) {
                    // reset multivalue collection to contain 
                    // single keyless value 
                    _multiValue.Reset();
                    _multiValue.Add(null, value); 
                }
                else {
                    // remember as string
                    _stringValue = value; 
                }
                _changed = true; 
            } 
        }
 
        /*
         * Checks is cookie has sub-keys
         */
 
        /// 
        ///    Gets a 
        ///       value indicating whether the cookie has sub-keys. 
        /// 
        public bool HasKeys { 
            get { return Values.HasKeys();}
        }

        private bool SupportsHttpOnly(HttpContext context) { 
            if (context != null && context.Request != null) {
                HttpBrowserCapabilities browser = context.Request.Browser; 
                return (browser != null && (browser.Type != "IE5" || browser.Platform != "MacPPC")); 
            }
            return false; 
        }

        /*
         * Cookie values as multivalue collection 
         */
 
        ///  
        ///    Gets individual key:value pairs within a single cookie object.
        ///  
        public NameValueCollection Values {
            get {
                if (_multiValue == null) {
                    // create collection on demand 
                    _multiValue = new HttpValueCollection();
 
                    // convert existing string value into multivalue 
                    if (_stringValue != null) {
                        if (_stringValue.IndexOf('&') >= 0 || _stringValue.IndexOf('=') >= 0) 
                            _multiValue.FillFromString(_stringValue);
                        else
                            _multiValue.Add(null, _stringValue);
 
                        _stringValue = null;
                    } 
                } 

                _changed = true; 

                return _multiValue;
            }
        } 

        /* 
         * Default indexed property -- lookup the multivalue collection 
         */
 
        /// 
        ///    
        ///       Shortcut for HttpCookie$Values[key]. Required for ASP compatibility.
        ///     
        /// 
        public String this[String key] 
        { 
            get {
                return Values[key]; 
            }

            set {
                Values[key] = value; 
                _changed = true;
            } 
        } 

        /* 
         * Construct set-cookie header
         */
        internal HttpResponseHeader GetSetCookieHeader(HttpContext context) {
            StringBuilder s = new StringBuilder(); 

            // cookiename= 
            if (!String.IsNullOrEmpty(_name)) { 
                s.Append(_name);
                s.Append('='); 
            }

            // key=value&...
            if (_multiValue != null) 
                s.Append(_multiValue.ToString(false));
            else if (_stringValue != null) 
                s.Append(_stringValue); 

            // domain 
            if (!String.IsNullOrEmpty(_domain)) {
                s.Append("; domain=");
                s.Append(_domain);
            } 

            // expiration 
            if (_expirationSet && _expires != DateTime.MinValue) { 
                s.Append("; expires=");
                s.Append(HttpUtility.FormatHttpCookieDateTime(_expires)); 
            }

            // path
            if (!String.IsNullOrEmpty(_path)) { 
                s.Append("; path=");
                s.Append(_path); 
            } 

            // secure 
            if (_secure)
                s.Append("; secure");

            // httponly, Note: IE5 on the Mac doesn't support this 
            if (_httpOnly && SupportsHttpOnly(context)) {
                s.Append("; HttpOnly"); 
            } 

            // return as HttpResponseHeader 
            return new HttpResponseHeader(HttpWorkerRequest.HeaderSetCookie, s.ToString());
        }
    }
 
    /////////////////////////////////////////////////////////////////////////////
    ///////////////////////////////////////////////////////////////////////////// 
    ///////////////////////////////////////////////////////////////////////////// 

    public enum HttpCookieMode { 

        UseUri,          // cookieless=true

        UseCookies,      // cookieless=false 

        AutoDetect,      // cookieless=AutoDetect; Probe if device is cookied 
 
        UseDeviceProfile // cookieless=UseDeviceProfile; Base decision on caps
    } 
}

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