# -*- coding: UTF-8 -*-

# Copyright (c) 2007 - 2010, Pascal Volk

# See COPYING for distribution information.

"""

   VirtualMailManager.Handler

   A wrapper class. It wraps round all other classes and does some

   dependencies checks.

   Additionally it communicates with the PostgreSQL database, creates

   or deletes directories of domains or users.

"""

import os

import re

from shutil import rmtree

from subprocess import Popen, PIPE

from pyPgSQL import PgSQL  # python-pgsql - http://pypgsql.sourceforge.net

from VirtualMailManager.Account import Account

from VirtualMailManager.Alias import Alias

from VirtualMailManager.AliasDomain import AliasDomain

from VirtualMailManager.common import exec_ok

from VirtualMailManager.Config import Config as Cfg

from VirtualMailManager.constants import \

     ACCOUNT_EXISTS, ALIAS_EXISTS, CONF_NOFILE, CONF_NOPERM, CONF_WRONGPERM, \

     DATABASE_ERROR, DOMAINDIR_GROUP_MISMATCH, DOMAIN_INVALID, \

     FOUND_DOTS_IN_PATH, INVALID_ARGUMENT, MAILDIR_PERM_MISMATCH, \

     NOT_EXECUTABLE, NO_SUCH_ACCOUNT, NO_SUCH_ALIAS, NO_SUCH_BINARY, \

     NO_SUCH_DIRECTORY, NO_SUCH_RELOCATED, RELOCATED_EXISTS

from VirtualMailManager.Domain import Domain, get_gid

from VirtualMailManager.EmailAddress import EmailAddress

from VirtualMailManager.errors import \

     DomainError, NotRootError, PermissionError, VMMError

from VirtualMailManager.mailbox import new as new_mailbox

from VirtualMailManager.pycompat import any

from VirtualMailManager.Relocated import Relocated

from VirtualMailManager.Transport import Transport

_ = lambda msg: msg

CFG_FILE = 'vmm.cfg'

CFG_PATH = '/root:/usr/local/etc:/etc'

RE_DOMAIN_SEARCH = """^[a-z0-9-\.]+$"""

TYPE_ACCOUNT = 0x1

TYPE_ALIAS = 0x2

TYPE_RELOCATED = 0x4

OTHER_TYPES = {

    TYPE_ACCOUNT: (_(u'an account'), ACCOUNT_EXISTS),

    TYPE_ALIAS: (_(u'an alias'), ALIAS_EXISTS),

    TYPE_RELOCATED: (_(u'a relocated user'), RELOCATED_EXISTS),

}

class Handler(object):

    """Wrapper class to simplify the access on all the stuff from

    VirtualMailManager"""

    def __init__(self, skip_some_checks=False):

        """Creates a new Handler instance.

        ``skip_some_checks`` : bool

            When a derived class knows how to handle all checks this

            argument may be ``True``. By default it is ``False`` and

            all checks will be performed.

        Throws a NotRootError if your uid is greater 0.

        """

        self._cfg_fname = ''

        self._cfg = None

        self._dbh = None

        if os.geteuid():

            raise NotRootError(_(u"You are not root.\n\tGood bye!\n"),

                               CONF_NOPERM)

            self._cfg = Cfg(self._cfg_fname)

            self._cfg.load()

        if not skip_some_checks:

            self._cfg.check()

            self._chkenv()

        """Search the CFG_FILE in CFG_PATH.

        Raise a VMMError when no vmm.cfg could be found.

        """

        for path in CFG_PATH.split(':'):

            tmp = os.path.join(path, CFG_FILE)

            if os.path.isfile(tmp):

                self._cfg_fname = tmp

                break

        if not self._cfg_fname:

            raise VMMError(_(u"Could not find '%(cfg_file)s' in: "

                             u"'%(cfg_path)s'") % {'cfg_file': CFG_FILE,

        """Checks the configuration file, returns bool"""

        fstat = os.stat(self._cfg_fname)

        fmode = int(oct(fstat.st_mode & 0777))

        if fmode % 100 and fstat.st_uid != fstat.st_gid or \

           fmode % 10 and fstat.st_uid == fstat.st_gid:

            raise PermissionError(_(u"wrong permissions for '%(file)s': "

                                    u"%(perms)s\n`chmod 0600 %(file)s` would "

                                    u"be great.") % {'file': self._cfg_fname,

                                  'perms': fmode}, CONF_WRONGPERM)

        else:

            return True

    def _chkenv(self):

        """Make sure our base_directory is a directory and that all

        required executables exists and are executable.

        If not, a VMMError will be raised"""

        basedir = self._cfg.dget('misc.base_directory')

        if not os.path.exists(basedir):

            old_umask = os.umask(0006)

            os.makedirs(basedir, 0771)

            os.chown(basedir, 0, 0)

            os.umask(old_umask)

        elif not os.path.isdir(basedir):

            raise VMMError(_(u"'%(path)s' is not a directory.\n(%(cfg_file)s: "

                             u"section 'misc', option 'base_directory')") %

                           {'path': basedir, 'cfg_file': self._cfg_fname},

                           NO_SUCH_DIRECTORY)

        for opt, val in self._cfg.items('bin'):

            try:

                exec_ok(val)

            except VMMError, err:

                if err.code is NO_SUCH_BINARY:

                    raise VMMError(_(u"'%(binary)s' doesn't exist.\n"

                                     u"(%(cfg_file)s: section 'bin', option "

                                     u"'%(option)s')") % {'binary': val,

                                   'cfg_file': self._cfg_fname, 'option': opt},

                                   err.code)

                elif err.code is NOT_EXECUTABLE:

                    raise VMMError(_(u"'%(binary)s' is not executable.\n"

                                     u"(%(cfg_file)s: section 'bin', option "

                                     u"'%(option)s')") % {'binary': val,

                                   'cfg_file': self._cfg_fname, 'option': opt},

                                   err.code)

                else:

                    raise

        """Creates a pyPgSQL.PgSQL.connection instance."""

        if self._dbh is None or (isinstance(self._dbh, PgSQL.Connection) and

                                  not self._dbh._isOpen):

            try:

                self._dbh = PgSQL.connect(

                        database=self._cfg.dget('database.name'),

                        user=self._cfg.pget('database.user'),

                        host=self._cfg.dget('database.host'),

                        password=self._cfg.pget('database.pass'),

                        client_encoding='utf8', unicode_results=True)

                dbc = self._dbh.cursor()

                dbc.execute("SET NAMES 'UTF8'")

                dbc.close()

    def _chk_other_address_types(self, address, exclude):

        """Checks if the EmailAddress *address* is known as `TYPE_ACCOUNT`,

        `TYPE_ALIAS` or `TYPE_RELOCATED`, but not as the `TYPE_*` specified

        by *exclude*.  If the *address* is known as one of the `TYPE_*`s

        the according `TYPE_*` constant will be returned.  Otherwise 0 will

        be returned."""

        assert exclude in (TYPE_ACCOUNT, TYPE_ALIAS, TYPE_RELOCATED) and \

                isinstance(address, EmailAddress)

        if exclude is not TYPE_ACCOUNT:

            account = Account(self._dbh, address)

            if account:

                return TYPE_ACCOUNT

        if exclude is not TYPE_ALIAS:

            alias = Alias(self._dbh, address)

            if alias:

                return TYPE_ALIAS

        if exclude is not TYPE_RELOCATED:

            relocated = Relocated(self._dbh, address)

            if relocated:

                return TYPE_RELOCATED

        return 0

    def _is_other_address(self, address, exclude):

        """Checks if *address* is known for an Account (TYPE_ACCOUNT),

        Alias (TYPE_ALIAS) or Relocated (TYPE_RELOCATED), except for

        *exclude*.  Returns `False` if the address is not known for other

        types.

        Raises a `VMMError` if the address is known.

        """

        other = self._chk_other_address_types(address, exclude)

        if not other:

            return False

        msg = _(u"There is already %(a_type)s with the address '%(address)s'.")

        raise VMMError(msg % {'a_type': OTHER_TYPES[other][0],

                              'address': address}, OTHER_TYPES[other][1])

        address = EmailAddress(address)

        return Account(self._dbh, address)

        address = EmailAddress(address)

        return Alias(self._dbh, address)

        address = EmailAddress(address)

        return Relocated(self._dbh, address)

        return Domain(self._dbh, domainname)

        """Estimate file space usage for the given directory.

        Keyword arguments:

        directory -- the directory to summarize recursively disk usage for

        """

            return Popen([self._cfg.dget('bin.du'), "-hs", directory],

                stdout=PIPE).communicate()[0].split('\t')[0]

        else:

            return 0

        isdir = os.path.isdir(directory)

        if not isdir:

        return isdir

        cwd = os.getcwd()

        hashdir, domdir = domain.directory.split(os.path.sep)[-2:]

        os.chdir(self._cfg.dget('misc.base_directory'))

        if not os.path.isdir(hashdir):

            os.mkdir(hashdir, 0711)

            os.chown(hashdir, 0, 0)

        os.mkdir(os.path.join(hashdir, domdir),

                 self._cfg.dget('domain.directory_mode'))

        os.chown(domain.directory, 0, domain.gid)

        os.chdir(cwd)

        """Create a home directory for the new Account *account*."""

        os.umask(0007)

        os.chdir(account.domain_directory)

        os.mkdir('%s' % account.uid, self._cfg.dget('account.directory_mode'))

        os.chown('%s' % account.uid, account.uid, account.gid)

        if uid > 0 and gid > 0:

            userdir = '%s' % uid

            if userdir.count('..') or domdir.count('..'):

                raise VMMError(_(u'Found ".." in home directory path.'),

                               FOUND_DOTS_IN_PATH)

            if os.path.isdir(domdir):

                os.chdir(domdir)

                if os.path.isdir(userdir):

                    mdstat = os.stat(userdir)

                    if (mdstat.st_uid, mdstat.st_gid) != (uid, gid):

                        raise VMMError(_(u'Detected owner/group mismatch in '

                                         u'home directory.'),

                                       MAILDIR_PERM_MISMATCH)

                    rmtree(userdir, ignore_errors=True)

                else:

                    raise VMMError(_(u"No such directory: %s") %

                                   os.path.join(domdir, userdir),

                                   NO_SUCH_DIRECTORY)

        if gid > 0:

                return

            basedir = self._cfg.dget('misc.base_directory')

            domdirdirs = domdir.replace(basedir + '/', '').split('/')

            domdirparent = os.path.join(basedir, domdirdirs[0])

            if basedir.count('..') or domdir.count('..'):

                raise VMMError(_(u'Found ".." in domain directory path.'),

                               FOUND_DOTS_IN_PATH)

            if os.path.isdir(domdirparent):

                os.chdir(domdirparent)

                if os.lstat(domdirdirs[1]).st_gid != gid:

                    raise VMMError(_(u'Detected group mismatch in domain '

                                     u'directory.'), DOMAINDIR_GROUP_MISMATCH)

                rmtree(domdirdirs[1], ignore_errors=True)

        """Checks if warnings are present, returns bool."""

        """Returns a list with all available warnings and resets all

        warnings.

        """

        return ret_val

    def cfg_dget(self, option):

        """Get the configured value of the *option* (section.option).

        When the option was not configured its default value will be

        returned."""

        return self._cfg.dget(option)

    def cfg_pget(self, option):

        """Get the configured value of the *option* (section.option)."""

        return self._cfg.pget(option)

    def cfg_install(self):

        """Installs the cfg_dget method as ``cfg_dget`` into the built-in

        namespace."""

        import __builtin__

        assert 'cfg_dget' not in __builtin__.__dict__

        __builtin__.__dict__['cfg_dget'] = self._cfg.dget

        if transport is None:

            dom.set_transport(Transport(self._dbh,

                              transport=self._cfg.dget('misc.transport')))

        else:

            dom.set_transport(Transport(self._dbh, transport=transport))

        dom.set_directory(self._cfg.dget('misc.base_directory'))

        dom.save()

        if force is not None and force != 'force':

            raise DomainError(_(u"Invalid argument: '%s'") % force,

                              INVALID_ARGUMENT)

        trsp = Transport(self._dbh, transport=transport)

        if force is None:

            dom.update_transport(trsp)

        else:

            dom.update_transport(trsp, force=True)

        if force and force not in ('deluser', 'delalias', 'delall'):