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vineri, 10 aprilie 2015

[OmniFaces utilities (2.0)] Get/check the currently logged-in user

[OmniFaces utilities] The getRemoteUser() method returns the name of the logged-in user for container managed FORM based authentication, if any.
[OmniFaces utilities] The isUserInRole() method returns whether the currently logged-in user has the given role.

Method Faces#getRemoteUser() - returns the name of the logged-in user for container managed FORM based authentication, if any
See also: Faces#getContext()

Method Faces#isUserInRole()- returns whether the currently logged-in user has the given role
See also: Faces#getContext()

The configuration of a FORM based authentication is specific to container. For example, if you are familiar with GlassFish 3/4, then you know that you must follow an entire process of configurations. Basically, you need to register a realm, declare the roles and groups (e.g. via <security-role-mapping>, <role-name> and   <group-name>) and declare the security constrains (e.g. via <security-constraint>). At the end, configure the login, which may look like this (in web.xml/glassfish-web.xml):


Finally, you will write the form that it is used by users to login (in login/login.xhtml):

<form action="j_security_check" method="POST">
  <input id="j_username" type="text" name="j_username" placeholder="Username"/>
  <input id="j_password" type="password" name="j_password" placeholder="Password"/>

In order to login, an user need to type his credentials via this form. Now, programmatically you find the name of the logged-in user (if any) via Faces#getRemoteUser():

String user = Faces.getRemoteUser();

Moreover, if you need to check if the currently logged-in user has the given role, then use Faces#isUserInRole():

boolean isinrole = Faces.isUserInRole("myRole");
   // do something

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