#! /usr/bin/env python
# Copyright (C) 2011 OpenStack, LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

# Synchronize Gerrit users from Launchpad.

import os
import sys
import uuid
import os
import subprocess

from datetime import datetime

import StringIO
import ConfigParser

import MySQLdb

from launchpadlib.launchpad import Launchpad
from launchpadlib.uris import LPNET_SERVICE_ROOT

from openid.consumer import consumer
from openid.cryptutil import randomString

DEBUG = False

GERRIT_USER = os.environ.get('GERRIT_USER', 'launchpadsync')
GERRIT_CONFIG = os.environ.get('GERRIT_CONFIG',
                                 '/home/gerrit2/review_site/etc/gerrit.config')
GERRIT_SECURE_CONFIG = os.environ.get('GERRIT_SECURE_CONFIG',
                                 '/home/gerrit2/review_site/etc/secure.config')
GERRIT_SSH_KEY = os.environ.get('GERRIT_SSH_KEY',
                                 '/home/gerrit2/.ssh/launchpadsync_rsa')
GERRIT_CACHE_DIR = os.path.expanduser(os.environ.get('GERRIT_CACHE_DIR',
                                '~/.launchpadlib/cache'))
GERRIT_CREDENTIALS = os.path.expanduser(os.environ.get('GERRIT_CREDENTIALS',
                                '~/.launchpadlib/creds'))
GERRIT_BACKUP_PATH = os.environ.get('GERRIT_BACKUP_PATH',
                                '/home/gerrit2/dbupdates')

for check_path in (os.path.dirname(GERRIT_CACHE_DIR),
                   os.path.dirname(GERRIT_CREDENTIALS),
                   GERRIT_BACKUP_PATH):
  if not os.path.exists(check_path):
    os.makedirs(check_path)

def get_broken_config(filename):
  """ gerrit config ini files are broken and have leading tabs """
  text = ""
  with open(filename,"r") as conf:
    for line in conf.readlines():
      text = "%s%s" % (text, line.lstrip())

  fp = StringIO.StringIO(text)
  c=ConfigParser.ConfigParser()
  c.readfp(fp)
  return c

def get_type(in_type):
  if in_type == "RSA":
    return "ssh-rsa"
  else:
    return "ssh-dsa"

gerrit_config = get_broken_config(GERRIT_CONFIG)
secure_config = get_broken_config(GERRIT_SECURE_CONFIG)

DB_USER = gerrit_config.get("database", "username")
DB_PASS = secure_config.get("database","password")
DB_DB = gerrit_config.get("database","database")

db_backup_file = "%s.%s.sql" % (DB_DB, datetime.isoformat(datetime.now()))
db_backup_path = os.path.join(GERRIT_BACKUP_PATH, db_backup_file)
retval = os.system("mysqldump --opt -u%s -p%s %s | gzip -9 > %s.gz" %
                     (DB_USER, DB_PASS, DB_DB, db_backup_path))
if retval != 0:
  print "Problem taking a db dump, aborting db update"
  sys.exit(retval)

conn = MySQLdb.connect(user = DB_USER, passwd = DB_PASS, db = DB_DB)
cur = conn.cursor()


launchpad = Launchpad.login_with('Gerrit User Sync', LPNET_SERVICE_ROOT,
                                 GERRIT_CACHE_DIR,
                                 credentials_file = GERRIT_CREDENTIALS)

def get_sub_teams(team, have_teams):
    for sub_team in launchpad.people[team].sub_teams:
        if sub_team.name not in have_teams:
           have_teams = get_sub_teams(sub_team.name, have_teams)
    have_teams.append(team)
    return have_teams


teams_todo = get_sub_teams('openstack', [])

users={}
groups={}
groups_in_groups={}
group_implies_groups={}
group_ids={}
projects = subprocess.check_output(['/usr/bin/ssh', '-p', '29418',
    '-i', GERRIT_SSH_KEY,
    '-l', GERRIT_USER, 'localhost',
    'gerrit', 'ls-projects']).split('\n')

for team_todo in teams_todo:

  team = launchpad.people[team_todo]
  groups[team.name] = team.display_name

  # Attempt to get nested group memberships. ~nova-core, for instance, is a
  # member of ~nova, so membership in ~nova-core should imply membership in
  # ~nova
  group_in_group = groups_in_groups.get(team.name, {})
  for subgroup in team.sub_teams:
    group_in_group[subgroup.name] = 1
  # We should now have a dictionary of the form {'nova': {'nova-core': 1}}
  groups_in_groups[team.name] = group_in_group

  for detail in team.members_details:

    user = None

    # detail.self_link ==
    # 'https://api.launchpad.net/1.0/~team/+member/${username}'
    login = detail.self_link.split('/')[-1]

    if users.has_key(login):
      user = users[login]
    else:

      user = dict(add_groups=[])

    status = detail.status
    if (status == "Approved" or status == "Administrator"):
      user['add_groups'].append(team.name)
    users[login] = user

# If we picked up subgroups that were not in our original list of groups
# make sure they get added
for (supergroup, subgroups) in groups_in_groups.items():
  for group in subgroups.keys():
    if group not in groups.keys():
      groups[group] = None

# account_groups
# groups is a dict of team name to team display name
# here, for every group we have in that dict, we're building another dict of
# group_name to group_id - and if the database doesn't already have the
# group, we're adding it
for (group_name, group_display_name) in groups.items():
  if cur.execute("select group_id from account_groups where name = %s",
                 group_name):
    group_ids[group_name] = cur.fetchall()[0][0]
  else:
    cur.execute("""insert into account_group_id (s) values (NULL)""");
    cur.execute("select max(s) from account_group_id")
    group_id = cur.fetchall()[0][0]

    # Match the 40-char 'uuid' that java is producing
    group_uuid = uuid.uuid4()
    second_uuid = uuid.uuid4()
    full_uuid = "%s%s" % (group_uuid.hex, second_uuid.hex[:8])

    cur.execute("""insert into account_groups
                   (group_id, group_type, owner_group_id,
                    name, description, group_uuid)
                   values
                   (%s, 'INTERNAL', 1, %s, %s, %s)""",
                (group_id, group_name, group_display_name, full_uuid))
    cur.execute("""insert into account_group_names (group_id, name) values
    (%s, %s)""",
    (group_id, group_name))

    group_ids[group_name] = group_id

# account_group_includes
# groups_in_groups should be a dict of dicts, where the key is the larger
# group and the inner dict is a list of groups that are members of the
# larger group. So {'nova': {'nova-core': 1}}
for (group_name, subgroups) in groups_in_groups.items():
  for subgroup_name in subgroups.keys():
    try:
      cur.execute("""insert into account_group_includes
                       (group_id, include_id)
                      values (%s, %s)""",
                  (group_ids[group_name], group_ids[subgroup_name]))
    except MySQLdb.IntegrityError:
      pass

# Make a list of implied group membership
# building a list which is the opposite of groups_in_group. Here
# group_implies_groups is a dict keyed by group_id containing a list of
# group_ids of implied membership. SO: if nova is 1 and nova-core is 2:
# {'2': [1]}
for group_id in group_ids.values():
    total_groups = []
    groups_todo = [group_id]
    while len(groups_todo) > 0:
        current_group = groups_todo.pop()
        total_groups.append(current_group)
        cur.execute("""select group_id from account_group_includes
                        where include_id = %s""", (current_group))
        for row in cur.fetchall():
            if row[0] != 1 and row[0] not in total_groups:
                groups_todo.append(row[0])
    group_implies_groups[group_id] = total_groups

if DEBUG:
    def get_group_name(in_group_id):
      for (group_name, group_id) in group_ids.items():
        if group_id == in_group_id:
          return group_name

    print "groups in groups"
    for (k,v) in groups_in_groups.items():
      print k, v

    print "group_imples_groups"
    for (k, v) in group_implies_groups.items():
      print get_group_name(k)
      new_groups=[]
      for val in v:
        new_groups.append(get_group_name(val))
      print "\t", new_groups

for (username, user_details) in users.items():

  # accounts
  account_id = None
  if cur.execute("""select account_id from account_external_ids where
    external_id in (%s)""", ("username:%s" % username)):
    account_id = cur.fetchall()[0][0]
    # We have this bad boy - all we need to do is update his group membership

  else:

    # We need details
    member = launchpad.people[username]
    if not member.is_team:

      openid_consumer = consumer.Consumer(dict(id=randomString(16, '0123456789abcdef')), None)
      openid_request = openid_consumer.begin("https://launchpad.net/~%s" % member.name)
      user_details['openid_external_id'] = openid_request.endpoint.getLocalID()

      # Handle username change
      if cur.execute("""select account_id from account_external_ids where
        external_id in (%s)""", user_details['openid_external_id']):
        account_id = cur.fetchall()[0][0]
        cur.execute("""update account_external_ids
                          set external_id=%s
                        where external_id like 'username%%'
                          and account_id = %s""",
                     ('username:%s' % username, account_id))
      else:
        user_details['ssh_keys'] = ["%s %s %s" % (get_type(key.keytype), key.keytext, key.comment) for key in member.sshkeys]


        email = None
        try:
          email = member.preferred_email_address.email
        except ValueError:
          pass
        user_details['email'] = email


        cur.execute("""insert into account_id (s) values (NULL)""");
        cur.execute("select max(s) from account_id")
        account_id = cur.fetchall()[0][0]

        cur.execute("""insert into accounts (account_id, full_name, preferred_email) values
        (%s, %s, %s)""", (account_id, username, user_details['email']))

        # account_ssh_keys
        for key in user_details['ssh_keys']:

          cur.execute("""select ssh_public_key from account_ssh_keys where
            account_id = %s""", account_id)
          db_keys = [r[0].strip() for r in cur.fetchall()]
          if key.strip() not in db_keys:

            cur.execute("""select max(seq)+1 from account_ssh_keys
                                  where account_id = %s""", account_id)
            seq = cur.fetchall()[0][0]
            if seq is None:
              seq = 1
            cur.execute("""insert into account_ssh_keys
                            (ssh_public_key, valid, account_id, seq)
                            values
                            (%s, 'Y', %s, %s)""",
                            (key.strip(), account_id, seq))

        # account_external_ids
        ## external_id
        if not cur.execute("""select account_id from account_external_ids
                              where account_id = %s and external_id = %s""",
                           (account_id, user_details['openid_external_id'])):
          cur.execute("""insert into account_external_ids
                         (account_id, email_address, external_id)
                         values (%s, %s, %s)""",
                     (account_id, user_details['email'], user_details['openid_external_id']))
        if not cur.execute("""select account_id from account_external_ids
                              where account_id = %s and external_id = %s""",
                           (account_id, "username:%s" % username)):
          cur.execute("""insert into account_external_ids
                         (account_id, external_id) values (%s, %s)""",
                      (account_id, "username:%s" % username))

        if user_details.get('email', None) is not None:
          if not cur.execute("""select account_id from account_external_ids
                                where account_id = %s and external_id = %s""",
                             (account_id, "mailto:%s" % user_details['email'])):
            cur.execute("""insert into account_external_ids
                           (account_id, email_address, external_id)
                           values (%s, %s, %s)""",
                        (account_id, user_details['email'], "mailto:%s" %
                        user_details['email']))

  if account_id is not None:
    # account_group_members
    # user_details['add_groups'] is a list of group names for which the
    # user is either "Approved" or "Administrator"

    groups_to_add = []
    groups_to_watch = {}
    groups_to_rm = {}

    for group in user_details['add_groups']:
      # if you are in the group nova-core, that should also put you in nova
      add_groups = group_implies_groups[group_ids[group]]
      add_groups.append(group_ids[group])
      for add_group in add_groups:
        if add_group not in groups_to_add:
          groups_to_add.append(add_group)
      # We only want to add watches for direct project membership groups
      groups_to_watch[group_ids[group]] = group

    # groups_to_add is now the full list of all groups we think the user
    # should belong to. we want to limit the users groups to this list
    for group in groups:
      if group_ids[group] not in groups_to_add:
        if group not in groups_to_rm.values():
          groups_to_rm[group_ids[group]] = group

    for group_id in groups_to_add:
      if not cur.execute("""select account_id from account_group_members
                            where account_id = %s and group_id = %s""",
                         (account_id, group_id)):
        # The current user does not exist in the group. Add it.
        cur.execute("""insert into account_group_members
                         (account_id, group_id)
                       values (%s, %s)""", (account_id, group_id))
        os_project_name = groups_to_watch.get(group_id, None)
        if os_project_name is not None:
          if os_project_name.endswith("-core"):
              os_project_name = os_project_name[:-5]
          os_project_name = "openstack/%s" % os_project_name
          if os_project_name in projects:
            if not cur.execute("""select account_id
                                   from account_project_watches
                                  where account_id = %s
                                    and project_name = %s""",
                                 (account_id, os_project_name)):
                cur.execute("""insert into account_project_watches
                               VALUES
                               ("Y", "N", "N", %s, %s, "*")""",
                               (account_id, os_project_name))

    for (group_id, group_name) in groups_to_rm.items():
      cur.execute("""delete from account_group_members
                     where account_id = %s and group_id = %s""",
                  (account_id, group_id))

os.system("ssh -i %s -p29418 %s@localhost gerrit flush-caches" %
          (GERRIT_SSH_KEY, GERRIT_USER))

conn.commit()