_ServiceNameStore.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / _ServiceNameStore.cs / 1305376 / _ServiceNameStore.cs
                        
                        
                            using System; 
using System.Collections.Generic;
using System.Security.Authentication.ExtendedProtection;
using System.Diagnostics;
 
namespace System.Net
{ 
    internal class ServiceNameStore 
    {
        private List serviceNames; 
        private ServiceNameCollection serviceNameCollection;

        public ServiceNameCollection ServiceNames
        { 
            get {
                if (serviceNameCollection == null) { 
                    serviceNameCollection = new ServiceNameCollection(serviceNames); 
                }
                return serviceNameCollection; 
            }
        }

        public ServiceNameStore() 
        {
            serviceNames = new List(); 
            serviceNameCollection = null; // set only when needed (due to expensive item-by-item copy) 
        }
 
        private bool AddSingleServiceName(string spn)
        {
            if (Contains(spn))
            { 
                return false;
            } 
            else 
            {
                serviceNames.Add(spn); 
                return true;
            }
        }
 
        public bool Add(string uriPrefix)
        { 
            Debug.Assert(!String.IsNullOrEmpty(uriPrefix)); 

            string[] newServiceNames = BuildServiceNames(uriPrefix); 

            bool addedAny = false;
            foreach (string spn in newServiceNames)
            { 
                if (AddSingleServiceName(spn))
                { 
                    addedAny = true; 

                    if (Logging.On) 
                    {
                        Logging.PrintInfo(Logging.HttpListener, "ServiceNameStore#" +
                            ValidationHelper.HashString(this) + "::Add() adding default SPNs '" +
                            spn + "' from prefix '" + uriPrefix + "'"); 
                    }
                } 
            } 

            if (addedAny) 
            {
                serviceNameCollection = null;
            }
            else if (Logging.On) 
            {
                Logging.PrintInfo(Logging.HttpListener, "ServiceNameStore#" + 
                    ValidationHelper.HashString(this) + "::Add() no default SPN added for prefix '" + 
                    uriPrefix + "'");
            } 

            return addedAny;
        }
 
        public bool Remove(string uriPrefix)
        { 
            Debug.Assert(!String.IsNullOrEmpty(uriPrefix)); 

            string newServiceName = BuildSimpleServiceName(uriPrefix); 
            bool needToRemove = Contains(newServiceName);

            if (needToRemove) {
                serviceNames.Remove(newServiceName); 
                serviceNameCollection = null; //invalidate (readonly) ServiceNameCollection
            } 
 
            if (Logging.On) {
                if (needToRemove) { 
                    Logging.PrintInfo(Logging.HttpListener, "ServiceNameStore#" +
                        ValidationHelper.HashString(this) + "::Remove() removing default SPN '" +
                        newServiceName + "' from prefix '" + uriPrefix + "'");
                } 
                else {
                    Logging.PrintInfo(Logging.HttpListener, "ServiceNameStore#" + 
                        ValidationHelper.HashString(this) + "::Remove() no default SPN removed for prefix '" + 
                        uriPrefix + "'");
                } 
            }

            return needToRemove;
        } 

        private bool Contains(string newServiceName) 
        { 
            if (newServiceName == null) {
                return false; 
            }

            bool found = false;
 
            foreach (string serviceName in serviceNames) {
 
                if (String.Compare(serviceName, newServiceName, 
                    StringComparison.InvariantCultureIgnoreCase) == 0) {
 
                    found = true;
                    break;
                }
            } 

            return found; 
        } 

        public void Clear() 
        {
            serviceNames.Clear();
            serviceNameCollection = null; //invalidate (readonly) ServiceNameCollection
        } 

        private string ExtractHostname(string uriPrefix, bool allowInvalidUriStrings) 
        { 
            if (Uri.IsWellFormedUriString(uriPrefix, UriKind.Absolute))
            { 
                Uri hostUri = new Uri(uriPrefix);
                return hostUri.Host;
            }
            else if (allowInvalidUriStrings) 
            {
                int i = uriPrefix.IndexOf("://") + 3; 
                int j = i; 

                bool inSquareBrackets = false; 
                while(j < uriPrefix.Length && uriPrefix[j] != '/' && (uriPrefix[j] != ':' || inSquareBrackets))
                {
                    if (uriPrefix[j] == '[')
                    { 
                        if (inSquareBrackets)
                        { 
                            j = i; 
                            break;
                        } 
                        inSquareBrackets = true;
                    }
                    if (inSquareBrackets && uriPrefix[j] == ']')
                    { 
                        inSquareBrackets = false;
                    } 
                    j++; 
                }
 
                return uriPrefix.Substring(i, j - i);
            }

            return null; 
        }
 
        public string BuildSimpleServiceName(string uriPrefix) 
        {
            string hostname = ExtractHostname(uriPrefix, false); 

            if (hostname != null)
            {
                return "HTTP/" + hostname; 
            }
            else 
            { 
                return null;
            } 
        }

        public string[] BuildServiceNames(string uriPrefix)
        { 
            string hostname = ExtractHostname(uriPrefix, true);
 
            IPAddress ipAddress = null; 
            if (String.Compare(hostname, "*", StringComparison.InvariantCultureIgnoreCase) == 0 ||
                String.Compare(hostname, "+", StringComparison.InvariantCultureIgnoreCase) == 0 || 
                IPAddress.TryParse(hostname, out ipAddress))
            {
                // for a wildcard, register the machine name.  If the caller doesn't have DNS permission
                // or the query fails for some reason, don't add an SPN. 
                try
                { 
                    string machineName = Dns.GetHostEntry(String.Empty).HostName; 
                    return new string[] { "HTTP/" + machineName };
                } 
                catch (System.Net.Sockets.SocketException)
                {
                    return new string[0];
                } 
                catch (System.Security.SecurityException)
                { 
                    return new string[0]; 
                }
            } 
            else if (!hostname.Contains("."))
            {
                // for a dotless name, try to resolve the FQDN.  If the caller doesn't have DNS permission
                // or the query fails for some reason, add only the dotless name. 
                try
                { 
                    string fqdn = Dns.GetHostEntry(hostname).HostName; 
                    return new string[] { "HTTP/" + hostname, "HTTP/" + fqdn };
                } 
                catch (System.Net.Sockets.SocketException)
                {
                    return new string[] { "HTTP/" + hostname };
                } 
                catch (System.Security.SecurityException)
                { 
                    return new string[] { "HTTP/" + hostname }; 
                }
            } 
            else
            {
                return new string[] { "HTTP/" + hostname };
            } 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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_ServiceNameStore.cs source code in C# .NET

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