AuthenticationAjaxFilter


1   package org.getahead.dwrdemo.filter;
2   
3   import java.lang.reflect.Method  ;
4   
5   import javax.servlet.http.HttpSession  ;
6   
7   import org.directwebremoting.AjaxFilter;
8   import org.directwebremoting.AjaxFilterChain;
9   import org.directwebremoting.WebContextFactory;
10  
11  /**
12   * Manages the current Authentication state.
13   * @author Joe Walker [joe at getahead dot ltd dot uk]
14   */
15  public class AuthenticationAjaxFilter implements AjaxFilter
16  {
17      /* (non-Javadoc)
18       * @see org.directwebremoting.AjaxFilter#doFilter(java.lang.Object, java.lang.reflect.Method, java.lang.Object[], org.directwebremoting.AjaxFilterChain)
19       */
20      public Object   doFilter(Object   object, Method   method, Object  [] params, AjaxFilterChain chain) throws Exception  
21      {
22          // We allow anyone to authenticate
23          if (authenticateName.equals(method.getName()))
24          {
25              return chain.doFilter(object, method, params);
26          }
27  
28          Object   user = getUser();
29          if (user != null)
30          {
31              return chain.doFilter(object, method, params);
32          }
33  
34          throw new SecurityException  ("Not authenticated");
35      }
36  
37      /**
38       * @return Returns the authenticateName.
39       */
40      public String   getAuthenticateName()
41      {
42          return authenticateName;
43      }
44  
45      /**
46       * @param authenticateName The authenticateName to set.
47       */
48      public void setAuthenticateName(String   authenticateName)
49      {
50          this.authenticateName = authenticateName;
51      }
52  
53      /**
54       * What is the name of the authenticate method?
55       */
56      private String   authenticateName = "authenticate";
57  
58      /**
59       * Accessor for the current user
60       * @param user The current user
61       */
62      public static void setUser(Object   user)
63      {
64          HttpSession   session = WebContextFactory.get().getSession(true);
65          session.setAttribute(USER, user);
66      }
67  
68      /**
69       * Accessor for the current user
70       * @return The current user
71       */
72      public static Object   getUser()
73      {
74          HttpSession   session = WebContextFactory.get().getSession(true);
75          return session.getAttribute(USER);
76      }
77  
78      /**
79       * The session key
80       */
81      private static final String   USER = "org.directwebremoting.filter.AuthenticationAjaxFilter.USER";
82  }
83
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