Example: com.ibm.wsspi.security.token.SingleSignonToken implementation

Use this file to see an example of a SingleSignon implementation. The following sample code does not extend an abstract class, but rather implements the com.ibm.wsspi.security.token.SingleSignonToken interface directly. You can implement the interface directly, but it might cause you to write duplicate code. However, you might choose to implement the interface directly if there are considerable differences between how you handle the various token implementations.

For information on how to implement a custom SingleSignonToken, see Implementing a custom SingleSignonToken.

package com.ibm.websphere.security.token;

import com.ibm.websphere.security.WSSecurityException;
import com.ibm.websphere.security.auth.WSLoginFailedException;
import com.ibm.wsspi.security.token.*;
import com.ibm.websphere.security.WebSphereRuntimePermission;
import java.io.ByteArrayOutputStream;
import java.io.ByteArrayInputStream;
import java.io.DataOutputStream;
import java.io.DataInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.OutputStream;
import java.io.InputStream;
import java.util.ArrayList;

public class CustomSingleSignonTokenImpl implements com.ibm.wsspi.security.
   token.SingleSignonToken
{
  private java.util.Hashtable hashtable = new java.util.Hashtable();
  private byte[] tokenBytes = null;
   // 2 hours in millis, by default
  private static long expire_period_in_millis = 2*60*60*1000; 
    
/**
 * Constructor used to create initial SingleSignonToken instance
 */

  public CustomSingleSignonTokenImpl (String principal)
  {
    // set the principal in the token
    addAttribute("principal", principal);
    // set the token version
    addAttribute("version", "1");
    // set the token expiration
    addAttribute("expiration", new Long(System.currentTimeMillis() + 
        expire_period_in_millis).toString());
  }

/**
 * Constructor used to deserialize the token bytes received during a propagation login.
 */
  public CustomSingleSignonTokenImpl (byte[] token_bytes)
  {
    try
    {
      // you should implement a decryption algorithm to decrypt the cookie bytes
      hashtable = (java.util.Hashtable) some_decryption_algorithm (token_bytes);
    }
    catch (Exception e)
    {
      e.printStackTrace();
    }
  }

/**
 * Validates the token including expiration, signature, and so on.
 * @return boolean
 */

  public boolean isValid ()
  {
    long expiration = getExpiration();

    // if you set the expiration to 0, it's does not expire
    if (expiration != 0)
    {
      // return if this token is still valid
      long current_time = System.currentTimeMillis();
      
      boolean valid = ((current_time < expiration) ? true : false);
      System.out.println("isValid: returning " + valid);
      return valid;
    }
    else
    {
      System.out.println("isValid: returning true by default");
      return true;
    }
  }

/**
 * Gets the expiration as a long.
 * @return long
 */
  public long getExpiration()
  {
    // get the expiration value from the hashtable
    String[] expiration = getAttributes("expiration");

    if (expiration != null && expiration[0] != null)
    {
      // expiration will always be the first element (should only be one)
      System.out.println("getExpiration: returning " + expiration[0]);
      return new Long(expiration[0]).longValue();
    }

    System.out.println("getExpiration: returning 0");
    return 0;
  }

/**
 * Returns if this token should be forwarded/propagated downstream.
 * @return boolean
 */
  public boolean isForwardable()
  {
    // We can choose whether your token gets propagated or not, in some cases 
     // you might want it to be local only.
    return true;  
  }

/**
 * Gets the principal that this Token belongs to. If this is an authorization token,
 * this principal string must match the authentication token principal string or the
 * message will be rejected.
 * @return String
 */
  public String getPrincipal()
  {
    // this could be any combination of attributes
    String[] principal = getAttributes("principal");

    if (principal != null && principal[0] != null)
    {
      return principal[0];
    }

    System.out.println("getExpiration: returning null");
    return null;
  }

/**
 * Returns a unique identifier of the token based upon information the provider
 * considers makes this a unique token.  This will be used for caching purposes
 * and may be used in combination with outher token unique IDs that are part of
 * the same Subject.
 *
 * This method should return null if you want the accessID of the user to represent
 * uniqueness.  This is the typical scenario.
 *
 * @return String
 */
  public String getUniqueID()
  {
    // this could be any combination of attributes
    return getPrincipal();
  }

/**
 * Gets the bytes to be sent across the wire.  The information in the byte[]
 * needs to be enough to recreate the Token object at the target server.
 * @return byte[]
 */
  public byte[] getBytes ()
  {
    if (hashtable != null)
    {
      try
      {
        // do this if the object is set read-only during login commit,
        // since this guarantees no new data gets set.
        if (isReadOnly() && tokenBytes == null)
          tokenBytes = some_encryption_algorithm (hashtable);

        // one can deserialize the tokenBytes using a similiar decryption algorithm.
        return tokenBytes;
      }
      catch (Exception e)
      {
        e.printStackTrace();
        return null;
      }
    }

    System.out.println("getBytes: returning null");
    return null;
  }

/**
 * Gets the name of the token, used to identify the byte[] in the protocol message.
 * @return String
 */
  public String getName()
  {
    return "myCookieName";
  }

/**
 * Gets the version of the token as an short.  This is also used to identify the
 * byte[] in the protocol message.
 * @return short
 */
  public short getVersion()
  {
    String[] version = getAttributes("version");

    if (version != null && version[0] != null)
      return new Short(version[0]).shortValue();

    System.out.println("getVersion: returning default of 1");
    return 1;
    }

/**
 * When called, the token becomes irreversibly read-only.  The implementation
 * needs to ensure any setter methods check that this has been set.
 */
  public void setReadOnly()
  {
    addAttribute("readonly", "true");
  }

/**
 * Called internally to see if the token is readonly
 */
  private boolean isReadOnly()
  {
    String[] readonly = getAttributes("readonly");

    if (readonly != null && readonly[0] != null)
      return new Boolean(readonly[0]).booleanValue();

    System.out.println("isReadOnly: returning default of false");
    return false;
  }

/**
 * Gets the attribute value based on the named value.
 * @param String key
 * @return String[]
 */
  public String[] getAttributes(String key)
  {
    ArrayList array = (ArrayList) hashtable.get(key);

    if (array != null && array.size() > 0)
    {
      return (String[]) array.toArray(new String[0]);
    }

    return null;
  }

/**
 * Sets the attribute name/value pair.  Returns the previous values set for key,
 * or null if not previously set.
 * @param String key
 * @param String value
 * @returns String[];
 */
  public String[] addAttribute(String key, String value)
  {
    // get the current value for the key
    ArrayList array = (ArrayList) hashtable.get(key);
        
    if (!isReadOnly())
    {
      // copy the ArrayList to a String[] as it currently exists
      String[] old_array = null;
      if (array != null && array.size() > 0)
        old_array = (String[]) array.toArray(new String[0]);

      // allocate a new ArrayList if one was not found
      if (array == null)
        array = new ArrayList();

      // add the String to the current array list
      array.add(value);

      // add the current ArrayList to the Hashtable
      hashtable.put(key, array);

      // return the old array
      return old_array;
    }

    return (String[]) array.toArray(new String[0]);
  }

    
/**
 * Gets the List of all attribute names present in the token.
 * @return java.util.Enumeration
 */
  public java.util.Enumeration getAttributeNames()
  {
    return hashtable.keys();
  }

/**
 * Returns a deep copying of this token, if necessary.
 * @return Object
 */
  public Object clone()
  {
    com.ibm.websphere.security.token.CustomSingleSignonImpl deep_clone = 
      new com.ibm.websphere.security.token.CustomSingleSignonTokenImpl();

    java.util.Enumeration keys = getAttributeNames();

    while (keys.hasMoreElements()) 
    {
      String key = (String) keys.nextElement();

      String[] list = (String[]) getAttributes(key);
            
      for (int i=0; i<list.length; i++)
        deep_clone.addAttribute(key, list[i]);
    }
    
        return deep_clone;
  }
}

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