DefaultProxySection.cs source code in C# .NET

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Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / Configuration / DefaultProxySection.cs / 1 / DefaultProxySection.cs
                        

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

namespace System.Net.Configuration 
{ 
    using System.Collections.Generic;
    using System.Configuration; 
    using System.Globalization;
    using System.Net;
    using System.Reflection;
    using System.Threading; 
    using System.Security.Permissions;
    using System.Security.Principal; 
    using System.ComponentModel; 

 
    public sealed class DefaultProxySection : ConfigurationSection
    {
        public DefaultProxySection()
        { 
            this.properties.Add(this.bypasslist);
            this.properties.Add(this.module); 
            this.properties.Add(this.proxy); 
            this.properties.Add(this.enabled);
            this.properties.Add(this.useDefaultCredentials); 
        }

        protected override void PostDeserialize()
        { 
            // Perf optimization. If the configuration is coming from machine.config
            // It is safe and we don't need to check for permissions. 
            if (EvaluationContext.IsMachineLevel) 
                return;
 
            try {
                ExceptionHelper.WebPermissionUnrestricted.Demand();
            } catch (Exception exception) {
                throw new ConfigurationErrorsException( 
                              SR.GetString(SR.net_config_section_permission,
                                           ConfigurationStrings.DefaultProxySectionName), 
                              exception); 
            }
        } 

        [ConfigurationProperty(ConfigurationStrings.BypassList)]
        public BypassElementCollection BypassList
        { 
            get { return (BypassElementCollection)this[this.bypasslist]; }
        } 
 
        [ConfigurationProperty(ConfigurationStrings.Module)]
        public ModuleElement Module 
        {
            get { return (ModuleElement)this[this.module]; }
        }
 
        protected override ConfigurationPropertyCollection Properties
        { 
            get { return this.properties; } 
        }
 
        [ConfigurationProperty(ConfigurationStrings.Proxy)]
        public ProxyElement Proxy
        {
            get { return (ProxyElement)this[this.proxy]; } 
        }
 
        [ConfigurationProperty(ConfigurationStrings.Enabled, DefaultValue = true)] 
        public bool Enabled
        { 
            get { return (bool) this[this.enabled]; }
            set { this[this.enabled] = value; }
        }
 
        [ConfigurationProperty(ConfigurationStrings.UseDefaultCredentials, DefaultValue = false)]
        public bool UseDefaultCredentials 
        { 
            get { return (bool) this[this.useDefaultCredentials]; }
            set { this[this.useDefaultCredentials] = value; } 
        }

        ConfigurationPropertyCollection properties = new ConfigurationPropertyCollection();
 
        readonly ConfigurationProperty bypasslist =
            new ConfigurationProperty(ConfigurationStrings.BypassList, 
                                      typeof(BypassElementCollection), 
                                      null,
                                      ConfigurationPropertyOptions.None); 

        readonly ConfigurationProperty module =
            new ConfigurationProperty(ConfigurationStrings.Module,
                                      typeof(ModuleElement), 
                                      null,
                                      ConfigurationPropertyOptions.None); 
 
        readonly ConfigurationProperty proxy =
            new ConfigurationProperty(ConfigurationStrings.Proxy, 
                                      typeof(ProxyElement),
                                      null,
                                      ConfigurationPropertyOptions.None);
 
        readonly ConfigurationProperty enabled =
            new ConfigurationProperty(ConfigurationStrings.Enabled, 
                                      typeof(bool), 
                                      true,
                                      ConfigurationPropertyOptions.None); 

        readonly ConfigurationProperty useDefaultCredentials =
            new ConfigurationProperty(ConfigurationStrings.UseDefaultCredentials,
                                      typeof(bool), 
                                      false,
                                      ConfigurationPropertyOptions.None); 
 

        // This allows us to prevent parent settings (machine.config) from propegating to higher config (app.config), unless 
        // the higher config doesn't contain the section at all.  That is, overriding defaultProxy is all-or-nothing.
        // Template from [....].
        protected override void Reset(ConfigurationElement parentElement)
        { 
            // Ignore the parentElement parameter by changing it to the default settings
            DefaultProxySection defaultElement = new DefaultProxySection(); 
 
            // Initialize the parentElement to the right set of defaults (not needed now,
            // but this will avoid errors in the future if SetDefaults is ever overridden in this class. 
            // ConfigurationElement::InitializeDefault is a no-op, so you aren�t hurting perf by anything
            // measurable.
            defaultElement.InitializeDefault();
 
            // Finally, pass it to the base class to do the �right things�
            base.Reset(defaultElement); 
        } 
    }
 
    internal sealed class DefaultProxySectionInternal
    {
        [SecurityPermission(SecurityAction.Assert, Flags=SecurityPermissionFlag.ControlPrincipal)]
        internal DefaultProxySectionInternal(DefaultProxySection section) 
        {
            // If enabled is false, skip everything. 
            if (!section.Enabled) 
            {
                return; 
            }

            // If nothing else is set, use the system default.
            if (section.Proxy.AutoDetect == ProxyElement.AutoDetectValues.Unspecified && 
                section.Proxy.ScriptLocation == null &&
                String.IsNullOrEmpty(section.Module.Type) && 
                section.Proxy.UseSystemDefault != ProxyElement.UseSystemDefaultValues.True && 
                section.Proxy.ProxyAddress == null &&
                section.Proxy.BypassOnLocal == ProxyElement.BypassOnLocalValues.Unspecified && 
                section.BypassList.Count == 0)
            {
                // Old-style indication to turn off the proxy.
                if (section.Proxy.UseSystemDefault == ProxyElement.UseSystemDefaultValues.False) 
                {
                    this.webProxy = new EmptyWebProxy(); 
 
                    // Intentionally ignoring UseDefaultCredentials in this case.
                    return; 
                }

                // Suspend impersonation.
                try { 
#if !FEATURE_PAL
                    using(WindowsIdentity.Impersonate(IntPtr.Zero)) 
#endif // !FEATURE_PAL 
                    {
                        this.webProxy = new WebRequest.WebProxyWrapper(new WebProxy(true)); 
                    }
                } catch {
                    throw;
                } 
            }
            else 
            { 
                // First, check out if we are using a different module type
                if (!String.IsNullOrEmpty(section.Module.Type)) 
                {
                    Type theType = Type.GetType(section.Module.Type, true, true);

                    if ((theType.Attributes & TypeAttributes.VisibilityMask) != TypeAttributes.Public) 
                        throw new ConfigurationErrorsException(SR.GetString(SR.net_config_proxy_module_not_public));
 
                    // verify that its of the proper type of IWebProxy 
                    if (!typeof(IWebProxy).IsAssignableFrom(theType))
                    { 
                        throw new InvalidCastException(SR.GetString(SR.net_invalid_cast,
                                                                    theType.FullName,
                                                                    "IWebProxy"));
                    } 
                    this.webProxy = (IWebProxy)Activator.CreateInstance(
                                    theType, 
                                    BindingFlags.CreateInstance 
                                    | BindingFlags.Instance
                                    | BindingFlags.NonPublic 
                                    | BindingFlags.Public,
                                    null,          // Binder
                                    new object[0], // no arguments
                                    CultureInfo.InvariantCulture 
                                    );
                } 
                else if (section.Proxy.UseSystemDefault == ProxyElement.UseSystemDefaultValues.True && 
                         section.Proxy.AutoDetect == ProxyElement.AutoDetectValues.Unspecified &&
                         section.Proxy.ScriptLocation == null) 
                {
                    // Suspend impersonation.  This setting is deprecated but required for Everett compat.
                    try {
#if !FEATURE_PAL 
                        using(WindowsIdentity.Impersonate(IntPtr.Zero))
#endif // !FEATURE_PAL 
                        { 
                            this.webProxy = new WebProxy(false);
                        } 
                    } catch {
                        throw;
                    }
                } 
                else
                { 
                    this.webProxy = new WebProxy(); 
                }
 
                WebProxy tempProxy = this.webProxy as WebProxy;

                if (tempProxy != null)
                { 
                    if (section.Proxy.AutoDetect != ProxyElement.AutoDetectValues.Unspecified)
                    { 
                        tempProxy.AutoDetect = section.Proxy.AutoDetect == ProxyElement.AutoDetectValues.True; 
                    }
                    if (section.Proxy.ScriptLocation != null) 
                    {
                        tempProxy.ScriptLocation = section.Proxy.ScriptLocation;
                    }
                    if (section.Proxy.BypassOnLocal != ProxyElement.BypassOnLocalValues.Unspecified) 
                    {
                        tempProxy.BypassProxyOnLocal = section.Proxy.BypassOnLocal == ProxyElement.BypassOnLocalValues.True; 
                    } 
                    if (section.Proxy.ProxyAddress != null)
                    { 
                        tempProxy.Address = section.Proxy.ProxyAddress;
                    }
                    int bypassListSize = section.BypassList.Count;
                    if (bypassListSize > 0) 
                    {
                        string[] bypassList = new string[section.BypassList.Count]; 
                        for (int index = 0; index < bypassListSize; ++index) 
                        {
                            bypassList[index] = section.BypassList[index].Address; 
                        }
                        tempProxy.BypassList = bypassList;
                    }
 
                    // Wrap it if type not explicitly specified in Module.
                    if (section.Module.Type == null) 
                    { 
                        this.webProxy = new WebRequest.WebProxyWrapper(tempProxy);
                    } 
                }
            }

            // Now apply UseDefaultCredentials if there's a proxy. 
            if (this.webProxy != null && section.UseDefaultCredentials)
            { 
                this.webProxy.Credentials = SystemNetworkCredential.defaultCredential; 
            }
        } 

        internal static object ClassSyncObject
        {
            get 
            {
                if (classSyncObject == null) 
                { 
                    object o = new object();
                    Interlocked.CompareExchange(ref classSyncObject, o, null); 
                }
                return classSyncObject;
            }
        } 

        static internal DefaultProxySectionInternal GetSection() 
        { 
            lock (DefaultProxySectionInternal.ClassSyncObject)
            { 
                DefaultProxySection section = PrivilegedConfigurationManager.GetSection(ConfigurationStrings.DefaultProxySectionPath) as DefaultProxySection;
                if (section == null)
                    return null;
 
                try
                { 
                    return new DefaultProxySectionInternal(section); 
                }
                catch (Exception exception) 
                {
                    if (NclUtilities.IsFatal(exception)) throw;

                    throw new ConfigurationErrorsException(SR.GetString(SR.net_config_proxy), exception); 
                }
                catch 
                { 
                    throw new ConfigurationErrorsException(SR.GetString(SR.net_config_proxy), new Exception(SR.GetString(SR.net_nonClsCompliantException)));
                } 
            }
        }

        internal IWebProxy WebProxy 
        {
            get { return this.webProxy; } 
        } 

        private IWebProxy webProxy; 
        private static object classSyncObject;
    }
}

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