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To demonstrate how to create a client application that
performs SSO authentication, an example client application is created.
The following illustration shows the steps that the client application
performs to authenticate a user using SSO.
The previous illustration describes the application flow that
occurs when the client application starts.
The client application triggers the applicationComplete event.
The call to ISSOManager.singleSignOn is
made. The client application sends a request to the User Manager
security servlet.
If the security servlet authenticates the user, then ISSOManager dispatches SSOEvent.AUTHENTICATION_SUCCESS.
As a response, the client application shows the main page. In this
example, the main page invokes the LiveCycle short-lived
process named MyApplication/EncryptDocument.
If the security servlet cannot determine if the user is valid,
then the application requests user credentials again. The ISSOManager class
dispatches the SSOEvent.AUTHENTICATION_REQUIRED event. The
client application displays the login page.
The credentials provided in the login page are sent to the ISSOManager.login method.
If the authentication is successful, then it leads to step 3. Otherwise
the SSOEvent.AUTHENTICATION_FAILED event is triggered.
The client application displays the login page and an appropriate error
message.
Creating the client applicationThe client application consists of the following files:
The following illustration provides a visual representation of
the client application.
Note: Notice that there are two packages named um
and views. When creating the client application, ensure that you
place the files in their proper packages. Also, ensure that you
add the adobe-remoting-provider.swc file to your project’s class
path. (See Including the LiveCycle Flex library file.)
Creating the SSOStandalone.mxml fileThe following code represents the SSOStandalone.mxml file.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute"
applicationComplete="initApp()"
height="400" width="550"
xmlns:v="views.*"
backgroundColor="#EDE8F0" viewSourceURL="srcview/index.html">
<mx:Script>
<![CDATA[
import mx.utils.URLUtil;
import um.SSOEvent;
import mx.core.UIComponent;
import um.SSOManager;
import mx.rpc.events.ResultEvent;
import mx.utils.ObjectUtil;
import mx.controls.Alert;
[Bindable]
private var _serverURL:String;
private var _ssoManager:SSOManager;
private var _progress:UIComponent;
private var _loginPage:UIComponent;
private function initApp():void{
_serverURL = determineServerUrl();
_ssoManager = new SSOManager(_serverURL);
_ssoManager.addEventListener(SSOEvent.AUTHENTICATION_FAILED,loginHandler);
_ssoManager.addEventListener(SSOEvent.AUTHENTICATION_SUCCESS,loginHandler);
_ssoManager.addEventListener(SSOEvent.AUTHENTICATION_REQUIRED,loginHandler);
_ssoManager.addEventListener(SSOEvent.LOGOUT_COMPLETE,loginHandler);
_ssoManager.addEventListener(SSOEvent.AUTHENTICATION_FAULT,loginHandler);
trace("[Main] Add the required event handlers for authentication");
_ssoManager.singleSignOn();
showBusy();
}
private function determineServerUrl():String
{
var s:String ;
var appUrl:String = Application.application.url;
var givenUrl:String = ExternalInterface.call("serverUrl.toString");
trace("[Main] Application url ["+appUrl+"] Given url ["+givenUrl+"]");
if(appUrl != null && appUrl.search("^http") != -1){
s = appUrl;
}
if(s == null){
s = givenUrl;
}
if(s== null){
s = "http://hiro-xp:8080/";
}
s = URLUtil.getFullURL(s,"/");
trace("[Main] Would be using ["+s+"] as serverUrl");
return s;
}
private function loginHandler(event:SSOEvent):void
{
trace("[Main] Handling event "+event.type);
switch(event.type)
{
case SSOEvent.AUTHENTICATION_FAILED:
viewContent.selectedChild = login;
login.showLoginFailed();
break;
case SSOEvent.AUTHENTICATION_SUCCESS:
viewContent.selectedChild = remoting;
break;
case SSOEvent.AUTHENTICATION_REQUIRED:
viewContent.selectedChild = login;
break;
case SSOEvent.LOGOUT_COMPLETE:
viewContent.selectedChild = logout;
break;
case SSOEvent.AUTHENTICATION_FAULT:
Alert.show("Error doing authentication. Root error ["+event.rootEvent+"]","Authentication Fault",Alert.OK);
}
}
public function get ssoManager():SSOManager
{
return _ssoManager;
}
public function showBusy():void
{
viewContent.selectedChild = progress;
}
public function get serverUrl():String
{
return _serverURL;
}
]]>
</mx:Script>
<mx:ViewStack x="0" y="0" id="viewContent" >
<v:login id="login" />
<v:remoting id="remoting" />
<v:progress id="progress" />
<v:logout id="logout"/>
</mx:ViewStack>
</mx:Application>
Creating the ISSOManager.as fileThe following code represents the ISSOManager.as file.
package um
{
import flash.events.IEventDispatcher;
/**
* The <code>ISSOManager</code> expose operations related to Single Sign On (SSO) in LiveCycle ES
* environment. The application should register appropriate <code>SSOEvent</code> handlers prior
* to calling any of the following operations
*/
public interface ISSOManager extends IEventDispatcher
{
/**
* Tries to validate whether the user has an already existing session or not (SSO Scenarios). The application
* may call this method during the initialization. In general this call would lead to one of the
* following events getting dispatched
* <ul>
* <li>SSOEvent.AUTHENTICATION_SUCCESS - If a SSO session was found and valid
* <li>SSOEvent.AUTHENTICATION_REQUIRED - No SSO session was found and as such authentication is required in
* the form of username and password.
* <li>SSOEvent.AUTHENTICATION_FAULT - Some error has occured while connecting to the server
* </ul>
*/
function singleSignOn():void;
/**
* Authenticates the user using username and password. It may lead to one of the following events
* <ul>
* <li>SSOEvent.AUTHENTICATION_SUCCESS - The authentication is successful and a session is established
* <li>SSOEvent.AUTHENTICATION_FAILED - Authentication has failed
* </ul>
*/
function login(username:String, password:String):void;
/**
* Terminates the current session and logs out the user.
*/
function logout():void;
/**
* Get the assertionId for the logged in user
*/
function get assertionId():String;
}
}
Creating the SSOEvent.as fileThe following code represents the SSOEvent.as file.
package um
{
import flash.events.Event;
/**
* The <code>SSOEvent</code> is dispatched for SSO related events
*/
public class SSOEvent extends Event
{
/**
* This type of event would be dispatched when the Authentication process is successful. Authentication
* might have been done with SSO or username and password. As a response to this event the application
* can show the welcome page to the user
* The application may want to perform specific check for permission/role so as to verify the user is allowed.
* So as a response to this event the application would do those checks and then only show the welcome page
*/
public static const AUTHENTICATION_SUCCESS:String = "authenticationSuccess";
/**
* This type of event would be dispatched when authentication fails using the username, password.
* As a response to this type of event an application can show an error message to the user.
* This event would only happen when authentication is done using username and password and NOT in
* SSO case.
*/
public static const AUTHENTICATION_FAILED:String = "authenticationFailed";
/**
* This type of event would be dispatched when authentication using SSO is not achieved. And due to
* that we require the user's username and password for authentication. As a response to this event
* the application can show the login page to the user.
*/
public static const AUTHENTICATION_REQUIRED:String = "authenticationRequired";
/**
* This type of event would be dispatched when logout is complete. As a response to this event the
* application may show a logout page informing the user that he has been logged out. Or the application
* can take the user back to login page
*/
public static const LOGOUT_COMPLETE:String = "logoutComplete";
/**
* This type of event would be dispatched when ever there is a problem in doing Authentication. The root cause
* can be obtained from the <code>rootEvent</code>.
*/
public static const AUTHENTICATION_FAULT:String = "authenticationFault";
private var _rootEvent:Event;
public function SSOEvent(type:String, rootEvent:Event=null)
{
super(type,true,false);
_rootEvent = rootEvent;
}
/**
* The root event. If current event type is <code>AUTHENTICATION_FAULT</code> then it would be an
* <code>IOErrorEvent</code> in other cases it would be complete event. Its basic use is to extract the root
* cause in case of an authentication fault.
*/
public function get rootEvent():Event
{
return _rootEvent;
}
}
}
Creating the SSOManager.as fileThe following code represents the SSOManager.as file.
package um
{
import flash.events.Event;
import flash.events.EventDispatcher;
import flash.events.IOErrorEvent;
import flash.external.ExternalInterface;
import flash.net.URLLoader;
import flash.net.URLLoaderDataFormat;
import flash.net.URLRequest;
import flash.net.URLVariables;
import mx.utils.ObjectUtil;
/**
* Manages the SSO related operations and dispatches appropriate events. It would connect to the UM Filter/Servlet
* at <code>um/login</code> The UM response would be of form of url encoded variables. It would look for
* <code>authstate</code> value in the response and depending on that it would proceed.
*
* <p>If there is an IO_Error while initial attempt to UM then it would assume it as a 401 response. And it would
* be assumed that SPNEGO based authenticatin is not working and therefore user would be shown a login page.
*/
public class SSOManager extends EventDispatcher implements ISSOManager
{
private static const SSO_URL:String = "um/login";
private static const SSO_LOGOUT_URL:String = "um/logout";
private static const AUTH_COOKIE_NAME:String = "lcAuthToken";
private var _serverUrl:String;
private var _assertionId:String;
/**
* Constructs an SSOManager with the given server url.
*
* @param serverUrl - The uri of the server to connect to. it must be without any context path e.g
* http://localhost:8080/. The SSOManager would directly append the path of UM exposed SSO url to it
* for its operations
*/
public function SSOManager(serverUrl:String)
{
_serverUrl = serverUrl;
}
public function singleSignOn():void
{
sendRequest(SSO_URL,true);
}
public function login(username:String, password:String):void
{
sendRequest(SSO_URL,false,
function(request:URLRequest,vars:URLVariables):void
{
vars.j_username = username;
vars.j_password = password;
}
);
}
public function logout():void
{
sendRequest(SSO_LOGOUT_URL);
}
public function get assertionId():String
{
return _assertionId;
}
/**
* Connects to the UM security service.
*/
private function sendRequest(relativeUrl:String,authenticationRequest:Boolean=false, requestProcessor:Function=null):void
{
var loader:URLLoader = new URLLoader();
loader.dataFormat = URLLoaderDataFormat.VARIABLES;
var request:URLRequest = new URLRequest(_serverUrl + relativeUrl);
trace("[SSOmanager] Contacting ["+request.url+"]");
var vars:URLVariables = new URLVariables();
vars.um_no_redirect = "true";
request.data = vars;
if(requestProcessor != null){
requestProcessor(request,vars);
}
loader.addEventListener(Event.COMPLETE,authHandler);
//if its an authentication request then only treat io error as a possible 401
//for others treat them as faults
if(authenticationRequest){
loader.addEventListener(IOErrorEvent.IO_ERROR,httpAuthenticationHandler);
}else{
loader.addEventListener(IOErrorEvent.IO_ERROR,authFaultHandler);
}
trace("[SSOmanager] Sending request "+ ObjectUtil.toString(request));
loader.load(request);
}
private function authHandler(event:Event):void
{
var loader:URLLoader = URLLoader(event.target);
var response:URLVariables = URLVariables(loader.data);
trace("[SSOmanager] Processing response ["+ObjectUtil.toString(response)+"]");
handleAuthResult(response["authstate"],response);
}
/**
* Handles the IOErrorEvent. Flash would dispatch IOEvent in response to HTTP 401.
* There is no way to distinguish it from the genuine IOError.
*/
private function httpAuthenticationHandler(event:IOErrorEvent):void
{
trace("[SSOmanager] Processing IOErrorEvent ["+ObjectUtil.toString(event)+"]");
handleAuthResult("CREDENTIAL_CHALLENGE");
}
/**
* Dispatches appropriate <code>SSOEvent</code> on the basis of the <code>authstate</code>
* value of the response.
* The response is url encoded in for of
* <pre>
* authenticated=false&authstate=SPNEGO_CHALLENGE
* </pre>
* Depending on <code>authstate</code> the SSOEvent is dispatched
*/
private function handleAuthResult(authState:String,response:URLVariables = null):void
{
trace("[SSOmanager] processing state "+authState);
switch(authState)
{
case "FAILED" :
dispatchEvent(new SSOEvent(SSOEvent.AUTHENTICATION_FAILED));
break;
case "COMPLETE" :
_assertionId = response ? response["assertionid"] : null;
dispatchEvent(new SSOEvent(SSOEvent.AUTHENTICATION_SUCCESS));
break;
case "CREDENTIAL_CHALLENGE" :
dispatchEvent(new SSOEvent(SSOEvent.AUTHENTICATION_REQUIRED));
break;
case "LOGGED_OUT" :
dispatchEvent(new SSOEvent(SSOEvent.LOGOUT_COMPLETE));
break;
default:
dispatchEvent(new SSOEvent(SSOEvent.AUTHENTICATION_REQUIRED));
break;
}
}
private function authFaultHandler(event:Event):void
{
dispatchEvent(new SSOEvent(SSOEvent.AUTHENTICATION_FAULT,event));
}
}
}
Creating the UserManager.as fileThe following code represents the UserManager.as file.
package um
{
import flash.events.Event;
import mx.rpc.soap.WebService;
import mx.rpc.soap.Operation;
import mx.rpc.IResponder;
import mx.rpc.events.FaultEvent;
import mx.rpc.events.ResultEvent;
import mx.rpc.soap.LoadEvent;
public class UserManager
{
private var _ssoManager:ISSOManager;
private var _serverUrl:String;
public function UserManager(ssoManager:ISSOManager,serverUrl:String)
{
_serverUrl = serverUrl;
_ssoManager = ssoManager;
}
public function retrieveAssertion(responder:IResponder):String
{
var assertionId:String = _ssoManager.assertionId;
if(!assertionId)
{
trace("[UserManager] AssertionId not found");
return null;
}
var ws:WebService = new WebService();
var wsdl:String = _serverUrl+'soap/services/AuthenticationManagerService?wsdl&lc_version=8.2.1';
ws.loadWSDL(wsdl);
ws.addEventListener(LoadEvent.LOAD,
function(event:Event):void
{
trace("[UserManager] WSDL loaded");
var authenticate:Operation = ws.authenticateWithHttpToken as Operation;
authenticate.resultFormat = "e4x";
authenticate.addEventListener(ResultEvent.RESULT,
function(event:Event):void
{
responder.result(event);
}
);
authenticate.send({assertionId:assertionId});
}
);
ws.addEventListener(FaultEvent.FAULT,
function(event:Event):void
{
responder.fault(event);
}
);
return null;
}
}
}
Creating the login.mxml fileThe following code represents the login.mxml file.
<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" width="500" height="400">
<mx:Script>
<![CDATA[
import mx.core.Application;
public function showLoginFailed():void
{
loginMessage.text = "Username or Password incorrect";
}
private function doLogin():void
{
Application.application.ssoManager.login(j_username.text,j_password.text);
Application.application.showBusy();
}
]]>
</mx:Script>
<mx:VBox height="113" width="244" x="128" y="144" horizontalAlign="center" verticalGap="10">
<mx:HBox width="100%">
<mx:HBox width="100%" verticalAlign="middle" horizontalAlign="center" height="32">
<mx:Label text="Username" fontWeight="bold"/>
<mx:TextInput id="j_username"/>
</mx:HBox>
</mx:HBox>
<mx:HBox width="100%" height="33" horizontalAlign="center" horizontalGap="10" verticalAlign="middle">
<mx:Label text="Password" fontWeight="bold"/>
<mx:TextInput displayAsPassword="true" id="j_password"/>
</mx:HBox>
<mx:Button label="Login" click="doLogin()"/>
</mx:VBox>
<mx:Text x="128" y="122" id="loginMessage" width="230" height="14"/>
<mx:Label x="154" y="65" text="LiveCycle SSO Demo" fontFamily="Georgia" fontSize="20" color="#0A0A0A"/>
</mx:Canvas>
Creating the logout.mxml fileThe following code represents the logout.mxml file.
<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" width="500" height="400">
<mx:Label x="97" y="188" text="You have successfully logged out from the application"/>
</mx:Canvas>
Creating the progress.mxml fileThe following code represents the progress.mxml file.
<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Label x="151" y="141" text="Wait...."/>
<mx:SWFLoader source="LoadingCircle.swf" width="50" height="50" horizontalCenter="0" verticalCenter="0"/>
</mx:Canvas>
Creating the remoting.mxml fileThe following code represents the remoting.mxml file that
invokes the MyApplication/EncryptDocument process. Because
a document is passed to the process, application logic responsible
for passing a secure document to LiveCycle is located in
this file. (See Passing secure documents to invoke processes using Remoting.)
<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" width="664" height="400" creationComplete="initializeChannelSet()" xmlns:views="views.*">
<mx:Script>
<![CDATA[
import mx.rpc.livecycle.DocumentReference;
import flash.net.FileReference;
import flash.net.URLRequest;
import flash.events.Event;
import flash.events.DataEvent;
import mx.messaging.ChannelSet;
import mx.messaging.channels.AMFChannel;
import mx.rpc.events.ResultEvent;
import mx.collections.ArrayCollection;
import mx.rpc.AsyncToken;
import um.UserManager;
import mx.rpc.events.ResultEvent;
import mx.rpc.events.FaultEvent;
import mx.core.Application;
import mx.rpc.Responder;
import mx.utils.ObjectUtil;
// Classes used in file retrieval
private var fileRef:FileReference = new FileReference();
private var docRef:DocumentReference = new DocumentReference();
private var parentResourcePath:String = "/";
//private var serverPort:String = "hiro-xp:8080";
private var serverPort:String = "hiro-xp:8080";
private var now1:Date;
private var userManager:UserManager;
// Define a ChannelSet object.
public var cs:ChannelSet;
// Holds information returned from LiveCycle ES
[Bindable]
public var progressList:ArrayCollection = new ArrayCollection();
// Set up channel set to invoke LiveCycle ES.
// This must be done before calling any service or process, but only
// once for the entire application.
private function initializeChannelSet():void {
cs = new ChannelSet();
cs.addChannel(new AMFChannel("remoting-amf", "http://" + serverPort + "/remoting/messagebroker/amf"));
EncryptDocument.channelSet = cs;
//Get the user that is authenticated
userManager = new UserManager(Application.application.ssoManager,Application.application.serverUrl);
userManager.retrieveAssertion(
new mx.rpc.Responder(
function(event:ResultEvent):void
{
var name:String = XML(event.currentTarget.lastResult)..*::authenticatedUser.*::userid.text();
username.text = "Welcome "+name;
},
function(event:FaultEvent):void
{
mx.controls.Alert.show(event.fault.faultString,'Error')
}
)
);
}
// Call this method to upload the file.
// This creates a file picker and lets the user select a PDF file to pass to the EncryptDocument process.
private function uploadFile():void {
fileRef.addEventListener(Event.SELECT, selectHandler);
fileRef.addEventListener(DataEvent.UPLOAD_COMPLETE_DATA,completeHandler);
fileRef.browse();
}
// Gets called for selected file. Does the actual upload via the file upload servlet.
private function selectHandler(event:Event):void {
var authTokenService:RemoteObject = new RemoteObject("LC.FileUploadAuthenticator");
authTokenService.addEventListener("result", authTokenReceived);
authTokenService.channelSet = cs;
authTokenService.getFileUploadToken();
}
private function authTokenReceived(event:ResultEvent):void
{
var token:String = event.result as String;
var request:URLRequest = DocumentReference.constructRequestForUpload("http://hiro-xp:8080", token);
try
{
fileRef.upload(request);
}
catch (error:Error)
{
trace("Unable to upload file.");
}
}
// Called once the file is completely uploaded.
private function completeHandler(event:DataEvent):void {
// Set the docRefs url and referenceType parameters
docRef.url = event.data as String;
docRef.referenceType=DocumentReference.REF_TYPE_URL;
executeInvokeProcess();
}
//This method invokes the EncryptDocument process
public function executeInvokeProcess():void {
//Create an Object to store the input value for the EncryptDocument process
now1 = new Date();
var params:Object = new Object();
params["inDoc"]=docRef;
// Invoke the EncryptDocument process
var token:AsyncToken;
token = EncryptDocument.invoke(params);
token.name = name;
}
// This method handles a successful conversion invocation
public function handleResult(event:ResultEvent):void
{
//Retrieve information returned from the service invocation
var token:AsyncToken = event.token;
var res:Object = event.result;
var dr:DocumentReference = res["outDoc"] as DocumentReference;
var now2:Date = new Date();
// These fields map to columns in the DataGrid
var progObject:Object = new Object();
progObject.filename = token.name;
progObject.timing = (now2.time - now1.time).toString();
progObject.state = "Success";
progObject.link = "<a href='" + dr.url + "'> open </a>";
progressList.addItem(progObject);
}
private function resultHandler(event:ResultEvent):void {
// Do anything else here.
}
private function logout():void
{
Application.application.ssoManager.logout();
Application.application.showBusy();
}
]]>
</mx:Script>
<mx:RemoteObject id="EncryptDocument" destination="MyApplication/EncryptDocument" result="resultHandler(event);">
<mx:method name="invoke" result="handleResult(event)"/>
</mx:RemoteObject>
<!--//This consists of what is displayed on the webpage-->
<mx:Panel id="lcPanel" title="EncryptDocument (Deprecated for AEM forms) LiveCycle Remoting Example"
height="25%" width="25%" paddingTop="10" paddingLeft="10" paddingRight="10"
paddingBottom="10">
<mx:Label width="100%" color="blue"
id="username"/>
<mx:DataGrid x="10" y="0" width="500" id="idProgress" editable="false"
dataProvider="{progressList}" height="231" selectable="false" >
<mx:columns>
<mx:DataGridColumn headerText="Filename" width="200" dataField="filename" editable="false"/>
<mx:DataGridColumn headerText="State" width="75" dataField="state" editable="false"/>
<mx:DataGridColumn headerText="Timing" width="75" dataField="timing" editable="false"/>
<mx:DataGridColumn headerText="Click to Open" dataField="link" editable="false" >
<mx:itemRenderer>
<mx:Component>
<mx:Text x="0" y="0" width="100%" htmlText="{data.link}"/>
</mx:Component>
</mx:itemRenderer>
</mx:DataGridColumn>
</mx:columns>
</mx:DataGrid>
<mx:Button label="Select File" click="uploadFile()" />
<mx:Button label="Logout" click="logout()" />
</mx:Panel>
</mx:Canvas>
Additional InformationThe following sections provide additional details that
describe the communication between the client application and the
User Manager security servlet.
A new authentication occursIn this situation, the user attempts to log in from a client
application to LiveCycle for the first time. (no previous
session involving the user exists.) In the applicationComplete event,
the SSOManager.singleSignOn method is invoked that sends
a request to the User Manager.
GET /um/login?um%5Fno%5Fredirect=true HTTP/1.1
The User Manager security servlet responds with the following
value:
HTTP/1.1 200 OK
authenticated=false&authstate=CREDENTIAL_CHALLENGE
As response to this value, a SSOEvent.AUTHENTICATION_REQUIRED value
is dispatched. As a result, the client application displays a login
screen to the user. The credentials are submitted back to the User
Manager security servlet.
GET /um/login?um%5Fno%5Fredirect=true&j%5Fusername=administrator&j%5Fpassword=password HTTP/1.1
The User Manager security servlet responds with the following
value:
HTTP/1.1 200 OK
Set-Cookie: lcAuthToken=53630BC8-F6D4-F588-5D5B-4668EFB2EC7A; Path=/
authenticated=true&authstate=COMPLETE&assertionid=53630BC8-F6D4-F588-5D5B-4668EFB2EC7A
As a result, authstate=COMPLETE the SSOEvent.AUTHENTICATION_SUCCESS is
dispatched. The client application can perform further processing
if necessary. For example, a log that tracks the date and time that
the user was authenticated can be created.
The user is already authenticatedIn this situation, the user has already logged in to LiveCycle and then navigates to the client application. The client application connects
to the User Manager security servlet during startup.
GET /um/login?um%5Fno%5Fredirect=true HTTP/1.1
Cookie: JSESSIONID=A4E0BCC2DD4BCCD3167C45FA350BD72A; lcAuthToken=53630BC8-F6D4-F588-5D5B-4668EFB2EC7A
Because the user is already authenticated, the User Manager cookie
is present and is sent to the User Manager security servlet. The
servlet then gets the assertionId value and verifies
whether it is valid. If it is valid, then authstate=COMPLETE is
returned. Otherwise authstate=CREDENTIAL_CHALLENGE is returned.
The following is a typical response:
HTTP/1.1 200 OK
authenticated=true&authstate=COMPLETE&assertionid=53630BC8-F6D4-F588-5D5B-4668EFB2EC7A
In this situation, the user is not shown a login screen and instead
directly taken to a Welcome Screen.
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