FORM Based Authentication
-------------------------

                 Key: SLING-1116
                 URL: https://issues.apache.org/jira/browse/SLING-1116
             Project: Sling
          Issue Type: New Feature
          Components: Extensions
            Reporter: Eric Norman


This is a new bundle that provides an implementation of forms based 
authentication for sling.

There are two servlets:
1. LoginServlet - bound to /session/login
2. LogoutServlet - bound to /session/logout

The FormAuthenticationHandler will use http basic auth credentials if they are 
on the request.  If there is no basic auth header, it will use attempt to use 
cached credentials stored on the server side by the LoginServlet.  

The login form html is generated by a set of scripts
1. login.html.esp     - full login page (includes login_body.html.esp for the 
form markup)
2. login_body.html.esp   - just the login form, which may be useful for drawing 
the login form for an ajax context
3. loginError.html.esp   - full login-error page
4. loginError_body.html.esp  - just the login-error form, for login error in 
ajax context

The above scripts are included as bundle-resources @ /libs/sling/servlet/default

The bundle also has a couple of test scripts to show some examples of usage:
1. loginTest.html.esp  - shows who is logged in and links to login or logout
2. loginTest2.html.esp - shows how a script can check permissions and show a 
login page if the anonymous user doesn't have permission to see the page,


Some examples of usage are:
1. http://host:port/path/to/node.login.html   - show the login page and then 
goto http://host:port/path/to/node after  authenticated
2. http://host:port/path/to/node.login.html?s=.edit.html   - show the login 
page and then goto http://host:port/path/to/node.edit.html after  authenticated
3. http://host:port/session/logout  - invalidate the session and switch back to 
anonymous user





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