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#!/usr/bin/python
#
# Copyright (C) 2014  Simo Sorce <simo@redhat.com>
#
# see file 'COPYING' for use and warranty information
#
# 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 3 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, see <http://www.gnu.org/licenses/>.

import cherrypy
from ipsilon.util.page import Page
from ipsilon.providers.saml2.provider import ServiceProvider
from ipsilon.providers.saml2.provider import ServiceProviderCreator
from ipsilon.providers.saml2.provider import InvalidProviderId


class NewSPAdminPage(Page):

    def __init__(self, site, parent):
        super(NewSPAdminPage, self).__init__(site)
        self.parent = parent
        self.title = 'New Service Provider'
        self.backurl = parent.url
        self.url = '%s/new' % (parent.url,)

    def form_new(self, message=None, message_type=None):
        return self._template('admin/providers/saml2_sp_new.html',
                              title=self.title,
                              message=message,
                              message_type=message_type,
                              name='saml2_sp_new_form',
                              backurl=self.backurl, action=self.url)

    def GET(self, *args, **kwargs):
        return self.form_new()

    def POST(self, *args, **kwargs):

        if self.user.is_admin:
            #TODO: allow authenticated user to create SPs on their own
            #      set the owner in that case
            name = None
            meta = None
            if 'content-type' not in cherrypy.request.headers:
                self._debug("Invalid request, missing content-type")
                message = "Malformed request"
                message_type = "error"
                return self.form_new(message, message_type)
            ctype = cherrypy.request.headers['content-type'].split(';')[0]
            if ctype != 'multipart/form-data':
                self._debug("Invalid form type (%s), trying to cope" % (
                            cherrypy.request.content_type,))
            for key, value in kwargs.iteritems():
                if key == 'name':
                    name = value
                elif key == 'meta':
                    if hasattr(value, 'content_type'):
                        meta = value.fullvalue()
                    else:
                        self._debug("Invalid format for 'meta'")

            if name and meta:
                try:
                    spc = ServiceProviderCreator(self.parent.cfg)
                    sp = spc.create_from_buffer(name, meta)
                    sp_page = self.parent.add_sp(name, sp)
                    message = "SP Successfully added"
                    message_type = "success"
                    return sp_page.form_standard(message, message_type)
                except InvalidProviderId, e:
                    message = str(e)
                    message_type = "error"
                except Exception, e:  # pylint: disable=broad-except
                    self._debug(repr(e))
                    message = "Failed to create Service Provider!"
                    message_type = "error"
            else:
                message = "A name and a metadata file must be provided"
                message_type = "error"
        else:
            message = "Unauthorized"
            message_type = "error"

        return self.form_new(message, message_type)

    def root(self, *args, **kwargs):
        op = getattr(self, cherrypy.request.method, self.GET)
        if callable(op):
            return op(*args, **kwargs)


class SPAdminPage(Page):

    def __init__(self, sp, site, parent):
        super(SPAdminPage, self).__init__(site)
        self.sp = sp
        self.title = sp.name
        self.backurl = parent.url
        self.url = '%s/sp/%s' % (parent.url, sp.name)

    def form_standard(self, message=None, message_type=None):
        return self._template('admin/providers/saml2_sp.html',
                              message=message,
                              message_type=message_type,
                              title=self.title,
                              name='saml2_sp_%s_form' % self.sp.name,
                              backurl=self.backurl, action=self.url,
                              data=self.sp)

    def GET(self, *args, **kwargs):
        return self.form_standard()

    def POST(self, *args, **kwargs):

        message = "Nothing was modified."
        message_type = "info"
        save = False

        for key, value in kwargs.iteritems():
            if key == 'name':
                if value != self.sp.name:
                    if self.user.is_admin or self.user.name == self.sp.owner:
                        self._debug("Replacing %s: %s -> %s" %
                                    (key, self.sp.name, value))
                        self.sp.name = value
                        save = True
                    else:
                        message = "Unauthorized to rename object"
                        message_type = "error"
                        return self.form_standard(message, message_type)

            elif key == 'owner':
                if value != self.sp.owner:
                    if self.user.is_admin:
                        self._debug("Replacing %s: %s -> %s" %
                                    (key, self.sp.owner, value))
                        self.sp.owner = value
                        save = True
                    else:
                        message = "Unauthorized to set owner value"
                        message_type = "error"
                        return self.form_standard(message, message_type)

            elif key == 'default_nameid':
                if value != self.sp.default_nameid:
                    if self.user.is_admin:
                        self._debug("Replacing %s: %s -> %s" %
                                    (key, self.sp.default_nameid, value))
                        self.sp.default_nameid = value
                        save = True
                    else:
                        message = "Unauthorized to set default nameid value"
                        message_type = "error"
                        return self.form_standard(message, message_type)

            elif key == 'allowed_nameids':
                v = set([x.strip() for x in value.split(',')])
                if v != set(self.sp.allowed_nameids):
                    if self.user.is_admin:
                        self._debug("Replacing %s: %s -> %s" %
                                    (key, self.sp.allowed_nameids, list(v)))
                        self.sp.allowed_nameids = list(v)
                        save = True
                    else:
                        message = "Unauthorized to set allowed nameids value"
                        message_type = "error"
                        return self.form_standard(message, message_type)

        if save:
            try:
                self.sp.save_properties()
                message = "Properties succssfully changed"
                message_type = "success"
            except Exception:  # pylint: disable=broad-except
                message = "Failed to save data!"
                message_type = "error"

        return self.form_standard(message, message_type)

    def root(self, *args, **kwargs):
        op = getattr(self, cherrypy.request.method, self.GET)
        if callable(op):
            return op(*args, **kwargs)


class AdminPage(Page):
    def __init__(self, site, config):
        super(AdminPage, self).__init__(site)
        self.name = 'admin'
        self.cfg = config
        self.providers = []
        self.menu = []
        self.url = None
        self.sp = Page(self._site)

    def add_sp(self, name, sp):
        page = SPAdminPage(sp, self._site, self)
        self.sp.add_subtree(name, page)
        self.providers.append(sp)
        return page

    def mount(self, page):
        self.menu = page.menu
        self.url = '%s/%s' % (page.url, self.name)
        for p in self.cfg.idp.get_providers():
            try:
                sp = ServiceProvider(self.cfg, p)
                self.add_sp(sp.name, sp)
            except Exception, e:  # pylint: disable=broad-except
                self._debug("Failed to find provider %s: %s" % (p, str(e)))
        self.add_subtree('new', NewSPAdminPage(self._site, self))
        page.add_subtree(self.name, self)

    def root(self, *args, **kwargs):
        return self._template('admin/providers/saml2.html',
                              title='SAML2 Administration',
                              providers=self.providers,
                              baseurl=self.url,
                              menu=self.menu)