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Wiki source code of Development-Examples-Login

Last modified by Pascal Robert on 2010/09/13 00:32
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Pascal Robert 3.1 1 == Simple Login ==
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3 Here is a little example on how to redirect a request to a "login" page if necessary:
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Pascal Robert 3.1 5 {{code}}
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Pascal Robert 3.1 7 public void appendToResponse(WOResponse aResponse, WOContext aContext) {
8 String aPageName = LoginPage.pageWithContext( aContext );
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Pascal Robert 3.1 10 if ( ( aPageName != null ) && ( this.name().equals( aPageName ) == false ) ) {
11 WOComponent aComponent = this.pageWithName( aPageName );
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Pascal Robert 3.1 13 this.currentSession().setPage( aPageName );
14 aContext._setPageComponent( aComponent );
15 aContext._setCurrentComponent( aComponent );
16 aComponent.appendToResponse( aResponse, aContext);
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Pascal Robert 3.1 18 return;
19 }
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Pascal Robert 3.1 21 this.currentSession().setPage( this.name() );
22 super.appendToResponse( aResponse, aContext);
23 }
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Pascal Robert 3.1 26 {{/code}}
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Pascal Robert 5.1 28 WOContext._setPageComponent() and WOContext._setCurrentComponent() are undocumented methods, but are required in order to update the WOContext with the current page and component information.
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Pascal Robert 3.1 30 The LoginPage class (not shown) will decide if a login is necessary or not.
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Pascal Robert 3.1 32 == Avoiding Session Timeouts at Login ==
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Pascal Robert 3.1 34 A good login should not timeout when no user is logged in. This can be a problem if your application uses a session in the page generation.
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Pascal Robert 3.1 36 Fortunately Apple has provided us with a way of doing this correctly: "DirectAction";. You should implement your login page as a DirectAction and be very careful not to create a "lazy" session otherwise you will have worked for nothing. WO create a session when you call certain methods so you have to be careful. Use this.context().hasSession() to check that everything is OK. After successful login you create a session by calling this.session() in your component and store the user in it; you are in business.
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Pascal Robert 3.1 38 On logout you destroy the session and return the direct action page that way the user has a new login screen instead of an empty screen. The easiest way of generating a login page on logout is to return a redirect page (302) to the main URL of the application it is transparent to the user and does exactly what you need.
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40 You will find the code sample there after. I place it in the Application and when I want to logout I just call handleLogout with the context.
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42 {{code}}
43
44 private WOResponse responseForPageWithName(String aPageName, WOContext aContext) {
45 if ( aPageName != null ) {
46 WOResponse aResponse = new WOResponse();
47 String adaptorPrefix = aContext.request().adaptorPrefix();
48 String applicationName = aContext.request().applicationName();
49 String anURL = adaptorPrefix + "/" + applicationName + ".woa";
50 aResponse.setHeader(anURL, "Location");
51 aResponse.setHeader("text/html", "content-type");
52 aResponse.setHeader("0","content-length");
53 aResponse.setStatus(302);
54 return aResponse;
55 }
56 return null;
57 }
58
59 public WOResponse handleLogout(WOContext aContext) {
60 WOResponse aResponse = this.responseForPageWithName("Login", aContext);
61 if ( ! aContext.session().isTerminating() ) {
62 ((Session)aContext.session()).setUser(null);
63 aContext.session().terminate();
64 }
65 return aResponse;
66 }
67
68 {{/code}}