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So you want to customize session auth in CherryPy 3.0? Not a piece of cake, is it? I mean, you could make a custom login_screen function and just attach it in config like this:

tools.session_auth.login_screen = my_login_func

...but that's not obvious if you're not used to metaprogramming (passing functions around). Here's a more class-based way to do it:

import cherrypy
from cherrypy.lib import cptools

class MySessionAuth(cptools.SessionAuth):
    def login_screen(self, from_page='..', username='', error_msg=''):
        return """<html><body>
Message: %(error_msg)s!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
<form method="post" action="do_login">
    Login: <input type="text" name="username" value="%(username)s" size="10" /><br />
    Password: <input type="password" name="password" size="10" /><br />
    <input type="hidden" name="from_page" value="%(from_page)s" /><br />
    <input type="submit" />
</body></html>""" % {'from_page': from_page, 'username': username,
                     'error_msg': error_msg}
    def runtool(cls, **kwargs):
        sa = cls()
        for k, v in kwargs.iteritems():
            setattr(sa, k, v)
    runtool = classmethod(runtool) = cherrypy._cptools.HandlerTool(MySessionAuth.runtool)

What I should have done was stuck that 'runtool' method in the builtin SessionAuth class so you'd get it for free. Ah, hindsight. ;)


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