IAuthenticationModule.Authenticate(String, WebRequest, ICredentials) Metoda

Definice

Obor názvů:

System.Net

Sestavení:

System.Net.Requests.dll

Vrátí instanci Authorization třídy v reakci na ověřovací výzvu ze serveru.

public:
 System::Net::Authorization ^ Authenticate(System::String ^ challenge, System::Net::WebRequest ^ request, System::Net::ICredentials ^ credentials);

public System.Net.Authorization? Authenticate (string challenge, System.Net.WebRequest request, System.Net.ICredentials credentials);

abstract member Authenticate : string * System.Net.WebRequest * System.Net.ICredentials -> System.Net.Authorization

Public Function Authenticate (challenge As String, request As WebRequest, credentials As ICredentials) As Authorization

Parametry

challenge

String

Ověřovací výzva odeslaná serverem

request

WebRequest

Instance přidružená WebRequest k výzvě.

credentials

ICredentials

Přihlašovací údaje přidružené k výzvě.

Návraty

Authorization

Instance Authorization obsahující autorizační zprávu pro požadavek nebo null pokud se výzva nedá zpracovat.

Příklady

Následující příklad ukazuje, jak používat metodu Authenticate . Úplný příklad najdete ve AuthenticationManager třídě .

// Authenticate is the core method for this custom authentication.
// When an internet resource requests authentication, the WebRequest::GetResponse
// method calls the AuthenticationManager::Authenticate method. This method, in
// turn, calls the Authenticate method on each of the registered authentication
// modules, in the order they were registered. When the authentication is
// complete an Authorization object is returned to the WebRequest, as
// shown by this routine's retun type.
virtual Authorization^ Authenticate( String^ challenge, WebRequest^ request, ICredentials^ credentials )
{
   Encoding^ ASCII = Encoding::ASCII;
   
   // Get the username and password from the credentials
   NetworkCredential^ MyCreds = credentials->GetCredential( request->RequestUri, "Basic" );
   if ( PreAuthenticate( request, credentials ) == nullptr )
         Console::WriteLine( "\n Pre-authentication is not allowed." );
   else
         Console::WriteLine( "\n Pre-authentication is allowed." );

   
   // Verify that the challenge satisfies the authorization requirements.
   bool challengeOk = checkChallenge( challenge, MyCreds->Domain );
   if (  !challengeOk )
         return nullptr;

   
   // Create the encrypted string according to the Basic authentication format as
   // follows:
   // a)Concatenate username and password separated by colon;
   // b)Apply ASCII encoding to obtain a stream of bytes;
   // c)Apply Base64 Encoding to this array of bytes to obtain the encoded
   // authorization.
   String^ BasicEncrypt = String::Concat( MyCreds->UserName, ":", MyCreds->Password );
   String^ BasicToken = String::Concat( "Basic ", Convert::ToBase64String( ASCII->GetBytes( BasicEncrypt ) ) );
   
   // Create an Authorization object using the above encoded authorization.
   Authorization^ resourceAuthorization = gcnew Authorization( BasicToken );
   
   // Get the Message property which contains the authorization string that the
   // client returns to the server when accessing protected resources
   Console::WriteLine( "\n Authorization Message: {0}", resourceAuthorization->Message );
   
   // Get the Complete property which is set to true when the authentication process
   // between the client and the server is finished.
   Console::WriteLine( "\n Authorization Complete: {0}", resourceAuthorization->Complete );
   
   Console::WriteLine( "\n Authorization ConnectionGroupId: {0}", resourceAuthorization->ConnectionGroupId );
   return resourceAuthorization;
}

// Authenticate is the core method for this custom authentication.
// When an Internet resource requests authentication, the WebRequest.GetResponse
// method calls the AuthenticationManager.Authenticate method. This method, in
// turn, calls the Authenticate method on each of the registered authentication
// modules, in the order in which they were registered. When the authentication is
// complete an Authorization object is returned to the WebRequest.
public Authorization Authenticate(String challenge, WebRequest request, ICredentials credentials)
{
  Encoding ASCII = Encoding.ASCII;

  // Get the username and password from the credentials
  NetworkCredential myCreds = credentials.GetCredential(request.RequestUri, "Basic");

  if (PreAuthenticate(request, credentials) == null)
    Console.WriteLine("\n Pre-authentication is not allowed.");
  else
    Console.WriteLine("\n Pre-authentication is allowed.");

  // Verify that the challenge satisfies the authorization requirements.
  bool challengeOk = CheckChallenge(challenge, myCreds.Domain);

  if (!challengeOk)
    return null;

  // Create the encrypted string according to the Basic authentication format as
  // follows:
  // a)Concatenate the username and password separated by colon;
  // b)Apply ASCII encoding to obtain a stream of bytes;
  // c)Apply Base64 encoding to this array of bytes to obtain the encoded
  // authorization.
  string basicEncrypt = myCreds.UserName + ":" + myCreds.Password;

  string basicToken = "Basic " + Convert.ToBase64String(ASCII.GetBytes(basicEncrypt));

  // Create an Authorization object using the encoded authorization above.
  Authorization resourceAuthorization = new Authorization(basicToken);

  // Get the Message property, which contains the authorization string that the
  // client returns to the server when accessing protected resources.
  Console.WriteLine("\n Authorization Message:{0}",resourceAuthorization.Message);

  // Get the Complete property, which is set to true when the authentication process
  // between the client and the server is finished.
  Console.WriteLine("\n Authorization Complete:{0}",resourceAuthorization.Complete);

  Console.WriteLine("\n Authorization ConnectionGroupId:{0}",resourceAuthorization.ConnectionGroupId);

  return resourceAuthorization;
}

  ' Authenticate is the core method for this custom authentication.
  ' When an Internet resource requests authentication, the WebRequest.GetResponse 
  ' method calls the AuthenticationManager.Authenticate method. This method, in 
  ' turn, calls the Authenticate method on each of the registered authentication
  ' modules, in the order in which they were registered. When the authentication is 
  ' complete an Authorization object is returned to the WebRequest.
  Public Function Authenticate(ByVal challenge As String, ByVal request As WebRequest, ByVal credentials As ICredentials) As Authorization _
      Implements IAuthenticationModule.Authenticate


    Dim ASCII As Encoding = Encoding.ASCII

    ' Get the username and password from the credentials
    Dim MyCreds As NetworkCredential = credentials.GetCredential(request.RequestUri, "Basic")

    If PreAuthenticate(request, credentials) Is Nothing Then
      Console.WriteLine(ControlChars.Lf + " Pre-authentication is not allowed.")
    Else
      Console.WriteLine(ControlChars.Lf + " Pre-authentication is allowed.")
    End If
    ' Verify that the challenge satisfies the authorization requirements.
    Dim challengeOk As Boolean = checkChallenge(challenge, MyCreds.Domain)

    If Not challengeOk Then
      Return Nothing
    End If

    ' Create the encrypted string according to the Basic authentication format as
    ' follows:
    ' a)Concatenate the username and password separated by colon;
    ' b)Apply ASCII encoding to obtain a stream of bytes;
    ' c)Apply Base64 encoding to this array of bytes to obtain the encoded 
    ' authorization.
    Dim BasicEncrypt As String = MyCreds.UserName + ":" + MyCreds.Password

    Dim BasicToken As String = "Basic " + Convert.ToBase64String(ASCII.GetBytes(BasicEncrypt))

    ' Create an Authorization object using the encoded authorization above.
    Dim resourceAuthorization As New Authorization(BasicToken)

    ' Get the Message property, which contains the authorization string that the 
    ' client returns to the server when accessing protected resources.
    Console.WriteLine(ControlChars.Lf + " Authorization Message:{0}", resourceAuthorization.Message)

    ' Get the Complete property, which is set to true when the authentication process 
    ' between the client and the server is finished.
    Console.WriteLine(ControlChars.Lf + " Authorization Complete:{0}", resourceAuthorization.Complete)

    Console.WriteLine(ControlChars.Lf + " Authorization ConnectionGroupId:{0}", resourceAuthorization.ConnectionGroupId)


    Return resourceAuthorization
  End Function 'Authenticate
End Class

Poznámky

Metoda Authenticate provede proces ověřování se serverem a vrátí Authorization instanci do .AuthenticationManager

Poznámky pro implementátory

Volá AuthenticationManager metodu v registrovaných Authenticate(String, WebRequest, ICredentials) ověřovacích modulech k určení, který modul zpracuje výzvu. Pokud ověřovací modul nezvládá výzvu, Authenticate(String, WebRequest, ICredentials) musí metoda vrátit null. Pokud ověřovací modul při provádění procesu ověřování narazí na chybu, Authenticate(String, WebRequest, ICredentials) musí vyvolat výjimku.