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#!/usr/bin/python
# Authors:
#     Endi S. Dewata <edewata@redhat.com>
#
# 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; version 2 of the License.
#
# 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.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Copyright (C) 2014 Red Hat, Inc.
# All rights reserved.
#

from __future__ import absolute_import
import os
from lxml import etree as ET

import pki
import pki.server.upgrade

class ReplaceRESTEasyApplicationClass(pki.server.upgrade.PKIServerUpgradeScriptlet):

    def __init__(self):
        super(ReplaceRESTEasyApplicationClass, self).__init__()
        self.message = 'Replace RESTEasy application class'
        self.class_names = {
            'ca': 'org.dogtagpki.server.ca.rest.CAApplication',
            'kra': 'org.dogtagpki.server.kra.rest.KRAApplication',
            'ocsp': 'org.dogtagpki.server.ocsp.rest.OCSPApplication',
            'tks': 'org.dogtagpki.server.tks.rest.TKSApplication',
            'tps': 'org.dogtagpki.server.tps.rest.TPSApplication'
        }

    def upgrade_subsystem(self, instance, subsystem):

        if subsystem.name not in self.class_names:
            return

        web_xml = os.path.join(
            instance.base_dir,
            'webapps', subsystem.name,
            'WEB-INF', 'web.xml')

        self.backup(web_xml)

        doc = ET.parse(web_xml)
        root = doc.getroot()

        servlet = root.find('servlet[servlet-name="Resteasy"]')

        if servlet is None:
            raise Exception('Resteasy servlet not found in ' + web_xml)

        param = servlet.find('init-param[param-name="javax.ws.rs.Application"]')

        if param is None:
            raise Exception('Resteasy application parameter not found in ' + web_xml)

        value = param.find('param-value')

        if value is None:
            raise Exception('Resteasy application value not found in ' + web_xml)

        value.text = self.class_names[subsystem.name]

        doc.write(web_xml)