#!/usr/bin/env python

# Copyright (c) 2015, Thomas Oulevey <thomas.oulevey@cern.ch>

# All rights reserved.

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions are met:

#

# 1. Redistributions of source code must retain the above copyright notice, this

#   list of conditions and the following disclaimer.

# 2. Redistributions in binary form must reproduce the above copyright notice,

#   this list of conditions and the following disclaimer in the documentation

#   and/or other materials provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

# INTERRUPTION) HOWEVER CAUSED AND  ON ANY THEORY OF LIABILITY, WHETHER

# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN

# IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# This script reads from a file, group information generated by FAS and sync

# it with koji

# No command line argument, options are hardcoded at this time.

import koji

import os.path

import sys

from collections import defaultdict

KOJI_URL = 'http://localhost/kojihub'

CLIENT_CERT = os.path.expanduser('/etc/pki/koji/koji-admin.pem')

CLIENTCA_CERT = os.path.expanduser('/etc/pki/koji/koji_ca_cert.crt')

SERVERCA_CERT = os.path.expanduser('/etc/pki/koji/koji_ca_cert.crt')

USER = 'koji'

FASDUMP = '/etc/bsadmin/groups'

SYSTEM_USERS = ['koji', 'kojira']

def get_user_list():

    users = [(x['name'], x['id']) for x in kojiclient.listUsers()]

    return users if len(users) else None

def get_user(user):

    user = kojiclient.getUser(user)

    return user

def get_user_perms(user):

    perms = kojiclient.getUserPerms(user[1])

    return perms

def get_users_perms():

    userlist = defaultdict(list)

    for user in get_user_list():

        userlist[user[0]] = get_user_perms(user)

    return userlist if len(userlist) else None

def get_user_perms_from_file(user):

    perms = get_users_perms_from_file()

    return perms[user]

def get_all_defined_perms():

    perms = []

    for perm in kojiclient.getAllPerms():

        perms.append(perm['name'])

    return perms

def get_users_perms_from_file():

    userlist = defaultdict(list)

    try:

        groups = open(FASDUMP, 'r')

    except:

        return None

    for line in groups.readlines():

        sig, users = line.strip('\n').split(':')

        for user in users.replace(" ", "").split(','):

            perm = "build-"+sig

            userlist[user].append(perm)

    return userlist if len(userlist) else None

def fix_permissions(new, old):

    usernames = list(set(new)|set(old))

    # Do not touch system users

    usernames = [u for u in usernames if u not in SYSTEM_USERS]

    for username in usernames:

        togrant = list(set(new[username]) - set(old[username]))

        torevoke = list(set(old[username]) - set(new[username]))

        user = get_user(username)

        if togrant or torevoke:

            print "\n# user:%s\n# NEW perms:%s\n# OLD perms:%s \

                  \n# To grant:%s\n# To revoke:%s" \

                  % (user, new[username], old[username], togrant, torevoke)

        if not user:

            # Create user if it doesn't exist yet

            user = kojiclient.createUser(username)

            # Always grant "build" permission for building from srpm

            kojiclient.grantPermission(username, 'build')

        for perm in togrant:

            if perm in get_all_defined_perms():

                kojiclient.grantPermission(username, perm)

        for perm in torevoke:

            if perm in get_all_defined_perms():

                kojiclient.revokePermission(username, perm)

if __name__ == '__main__':

    try:

        kojiclient = koji.ClientSession(KOJI_URL)

        kojiclient.ssl_login(CLIENT_CERT, CLIENTCA_CERT, SERVERCA_CERT)

    except:

        print "Could not connect to koji API"

        sys.exit(2)

    fas_perms = get_users_perms_from_file()

    koji_perms = get_users_perms()

    if not fas_perms:

        print "Could not read %s file." % FASDUMP

        sys.exit(1)

    if not koji_perms:

        print "Could not read koji's user database"

        sys.exit(2)

    fix_permissions(fas_perms, koji_perms)

    sys.exit(0)