#
#  Copyright (c) 2011 Helmut Merz helmutm@cy55.de
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

"""
login, logout and similar stuff.

$Id$
"""

import urllib
from zope.app.authentication.session import SessionCredentialsPlugin
from zope.app.component import hooks
from zope.app.i18n import ZopeMessageFactory as _
from zope.app.security.browser.auth import LoginLogout as BaseLoginLogout
from zope.app.security.interfaces import IUnauthenticatedPrincipal
from zope.app.security.interfaces import ILogoutSupported
from zope.cachedescriptors.property import Lazy
from zope.i18n import translate
from zope.publisher.interfaces.http import IHTTPRequest
from zope.traversing.browser import absoluteURL


class LoopsSessionCredentialsPlugin(SessionCredentialsPlugin):

    def challenge(self, request):
        if not IHTTPRequest.providedBy(request):
            return False
        site = hooks.getSite()
        #camefrom = request.getURL() # wrong when object is not viewable
        #camefrom = request.getApplicationURL() + request['PATH_INFO']
        path = request['PATH_INFO'].split('/++/')[-1] # strip virtual host stuff
        if not path.startswith('/'):
            path = '/' + path
        camefrom = request.getApplicationURL() + path
        if 'login' in camefrom:
            camefrom = '/'.join(camefrom.split('/')[:-1])
        url = '%s/@@%s?%s' % (absoluteURL(site, request),
                              self.loginpagename,
                              urllib.urlencode({'camefrom': camefrom}))
        request.response.redirect(url)
        return True


class LoginLogout(BaseLoginLogout):

    def __call__(self):
        if IUnauthenticatedPrincipal.providedBy(self.request.principal):
            return u'<a href="@@login.html">%s</a>' % (
                #urllib.quote(self.request.getURL()),
                translate(_('[Login]'), context=self.request,
                          default='[Login]'))
        elif ILogoutSupported(self.request, None) is not None:
            return u'<a href="@@logout.html?nextURL=%s/login.html">%s</a>' % (
                zapi.absoluteURL(self.context, self.request),
                translate(_('[Logout]'), context=self.request,
                          default='[Logout]'))
        else:
            return None