_BasicClient.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / _BasicClient.cs / 1305376 / _BasicClient.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Net { 
    using System.Text; 
    using System.Globalization;
    using System.Security.Permissions; 

    internal class BasicClient : IAuthenticationModule {

        internal const string AuthType = "Basic"; 
        internal static string Signature = AuthType.ToLower(CultureInfo.InvariantCulture);
        internal static int SignatureSize = Signature.Length; 
 
        public Authorization Authenticate(string challenge, WebRequest webRequest, ICredentials credentials) {
            GlobalLog.Print("BasicClient::Authenticate(): " + challenge); 

            GlobalLog.Assert(credentials != null, "BasicClient::Authenticate()|credentials == null");
#if !FEATURE_PAL
            if (credentials==null || credentials is SystemNetworkCredential) { 
#else
            if (credentials==null) { 
#endif // !FEATURE_PAL 
                return null;
            } 

            HttpWebRequest httpWebRequest = webRequest as HttpWebRequest;

            GlobalLog.Assert(httpWebRequest != null, "BasicClient::Authenticate()|httpWebRequest == null"); 
            if (httpWebRequest==null || httpWebRequest.ChallengedUri==null) {
                // 
                // there has been no challenge: 
                // 1) the request never went on the wire
                // 2) somebody other than us is calling into AuthenticationManager 
                //
                return null;
            }
 
            int index = AuthenticationManager.FindSubstringNotInQuotes(challenge, Signature);
            if (index < 0) { 
                return null; 
            }
 
            return Lookup(httpWebRequest, credentials);
        }

        public bool CanPreAuthenticate { 
            get {
                return true; 
            } 
        }
 
        public Authorization PreAuthenticate(WebRequest webRequest, ICredentials credentials) {
            GlobalLog.Print("BasicClient::PreAuthenticate()");

            GlobalLog.Assert(credentials != null, "BasicClient::Authenticate()|credentials == null"); 
#if !FEATURE_PAL
            if (credentials==null || credentials is SystemNetworkCredential) { 
#else 
            if (credentials==null) {
#endif // !FEATURE_PAL 
                return null;
            }

            HttpWebRequest httpWebRequest = webRequest as HttpWebRequest; 

            GlobalLog.Assert(httpWebRequest != null, "BasicClient::Authenticate()|httpWebRequest == null"); 
            if (httpWebRequest==null) { 
                return null;
            } 

            return Lookup(httpWebRequest, credentials);
        }
 
        public string AuthenticationType {
            get { 
                return AuthType; 
            }
        } 


        private Authorization Lookup(HttpWebRequest httpWebRequest, ICredentials credentials) {
            GlobalLog.Print("BasicClient::Lookup(): ChallengedUri:" + httpWebRequest.ChallengedUri.ToString()); 

            NetworkCredential NC = credentials.GetCredential(httpWebRequest.ChallengedUri, Signature); 
            GlobalLog.Print("BasicClient::Lookup() GetCredential() returns:" + ValidationHelper.ToString(NC)); 

            if (NC==null) { 
                return null;
            }

            ICredentialPolicy policy = AuthenticationManager.CredentialPolicy; 
            if (policy != null && !policy.ShouldSendCredential(httpWebRequest.ChallengedUri, httpWebRequest, NC, this))
                return null; 
 

            string username = NC.InternalGetUserName(); 
            string domain = NC.InternalGetDomain();

            if (ValidationHelper.IsBlankString(username)) {
                return null; 
            }
 
            string rawString = ((!ValidationHelper.IsBlankString(domain)) ? (domain + "\\") : "") + username + ":" + NC.InternalGetPassword(); 

            // The response is an "Authorization:" header where the value is 
            // the text "Basic" followed by BASE64 encoded (as defined by RFC1341) value

            byte[] bytes = EncodingRightGetBytes(rawString);
            string responseHeader = BasicClient.AuthType + " " + Convert.ToBase64String(bytes); 

            return new Authorization(responseHeader, true); 
        } 

        internal static byte[] EncodingRightGetBytes(string rawString) { 
            GlobalLog.Enter("BasicClient::EncodingRightGetBytes", "[" + rawString.Length.ToString() + ":" + rawString + "]");
            //
            // in order to know if there will not be any '?' translations (which means
            // we should use the Default Encoding) we need to attempt encoding and then decoding. 
            // this is a limitation only on win9x, if we ever drop support for this platform there might be
            // a more efficient way of doing this. 
            // 
            GlobalLog.Print("BasicClient::EncodingRightGetBytes(): Default Encoding is:" + Encoding.Default.EncodingName);
 
            byte[] bytes = Encoding.Default.GetBytes(rawString);
            string rawCopy = Encoding.Default.GetString(bytes);
            bool canMapToCurrentCodePage = string.Compare(rawString, rawCopy, StringComparison.Ordinal)==0;
 
            GlobalLog.Print("BasicClient::EncodingRightGetBytes(): canMapToCurrentCodePage:" + canMapToCurrentCodePage.ToString());
 
            // 
            // if mapping to the current code page leaves characters out of the
            // [0x00, 0xFF] range, then we need to use the new encoding that IIS6.0 
            // will support. do it when they decide it's good enough.
            // 
            if (!canMapToCurrentCodePage) {
                // 
                // for now throw. when IIS 6.0 adds support test it.
                // 
                GlobalLog.LeaveException("BasicClient::EncodingRightGetBytes", ExceptionHelper.MethodNotSupportedException); 
                throw ExceptionHelper.MethodNotSupportedException;
                /* 
                GlobalLog.Print("BasicClient::EncodingRightGetBytes(): using:" + Encoding.UTF8.EncodingName);
                bytes = Encoding.UTF8.GetBytes(rawString);

                string blob = "=?utf-8?B?" + Convert.ToBase64String(bytes) + "?="; 
                bytes = Encoding.ASCII.GetBytes(blob);
                */ 
            } 

            GlobalLog.Dump(bytes); 
            GlobalLog.Leave("BasicClient::EncodingRightGetBytes", bytes.Length.ToString());

            return bytes;
        } 

    }; // class BasicClient 
 

} // namespace System.Net 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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_BasicClient.cs source code in C# .NET

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