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# Authors:
#   Andrew Wnuk <awnuk@redhat.com>
#   Jason Gerard DeRose <jderose@redhat.com>
#   John Dennis <jdennis@redhat.com>
#
# Copyright (C) 2009  Red Hat
# 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 subprocess
from tempfile import NamedTemporaryFile as NTF

import six

from ipaclient.frontend import MethodOverride
from ipalib import errors
from ipalib import x509
from ipalib import util
from ipalib.parameters import File, Flag, Str
from ipalib.plugable import Registry
from ipalib.text import _

if six.PY3:
    unicode = str

register = Registry()


@register(override=True, no_fail=True)
class cert_request(MethodOverride):
    takes_options = (
        Str(
            'database?',
            label=_('Path to NSS database'),
            doc=_('Path to NSS database to use for private key'),
        ),
        Str(
            'private_key?',
            label=_('Path to private key file'),
            doc=_('Path to PEM file containing a private key'),
        ),
        Str(
            'csr_profile_id?',
            label=_('Name of CSR generation profile (if not the same as'
                    ' profile_id)'),
        ),
    )

    def get_args(self):
        for arg in super(cert_request, self).get_args():
            if arg.name == 'csr':
                arg = arg.clone_retype(arg.name, File, required=False)
            yield arg

    def forward(self, csr=None, **options):
        database = options.pop('database', None)
        private_key = options.pop('private_key', None)
        csr_profile_id = options.pop('csr_profile_id', None)

        if csr is None:
            if database:
                helper = u'certutil'
                helper_args = ['-d', database]
            elif private_key:
                helper = u'openssl'
                helper_args = [private_key]
            else:
                raise errors.InvocationError(
                    message=u"One of 'database' or 'private_key' is required")

            with NTF() as scriptfile, NTF() as csrfile:
                # If csr_profile_id is passed, that takes precedence.
                # Otherwise, use profile_id. If neither are passed, the default
                # in cert_get_requestdata will be used.
                profile_id = csr_profile_id
                if profile_id is None:
                    profile_id = options.get('profile_id')

                self.api.Command.cert_get_requestdata(
                    profile_id=profile_id,
                    principal=options.get('principal'),
                    out=unicode(scriptfile.name),
                    helper=helper)

                helper_cmd = [
                    'bash', '-e', scriptfile.name, csrfile.name] + helper_args

                try:
                    subprocess.check_output(helper_cmd)
                except subprocess.CalledProcessError as e:
                    raise errors.CertificateOperationError(
                        error=(
                            _('Error running "%(cmd)s" to generate CSR:'
                              ' %(err)s') %
                            {'cmd': ' '.join(helper_cmd), 'err': e.output}))

                try:
                    csr = unicode(csrfile.read())
                except IOError as e:
                    raise errors.CertificateOperationError(
                        error=(_('Unable to read generated CSR file: %(err)s')
                               % {'err': e}))
                if not csr:
                    raise errors.CertificateOperationError(
                        error=(_('Generated CSR was empty')))
        else:
            if database is not None or private_key is not None:
                raise errors.MutuallyExclusiveError(reason=_(
                    "Options 'database' and 'private_key' are not compatible"
                    " with 'csr'"))

        return super(cert_request, self).forward(csr, **options)


@register(override=True, no_fail=True)
class cert_show(MethodOverride):
    def forward(self, *keys, **options):
        if 'out' in options:
            util.check_writable_file(options['out'])
            result = super(cert_show, self).forward(*keys, **options)
            if 'certificate' in result['result']:
                x509.write_certificate(result['result']['certificate'], options['out'])
                return result
            else:
                raise errors.NoCertificateError(entry=keys[-1])
        else:
            return super(cert_show, self).forward(*keys, **options)


@register(override=True, no_fail=True)
class cert_remove_hold(MethodOverride):
    has_output_params = (
        Flag('unrevoked',
            label=_('Unrevoked'),
        ),
        Str('error_string',
            label=_('Error'),
        ),
    )


@register(override=True, no_fail=True)
class cert_find(MethodOverride):
    takes_options = (
        File(
            'file?',
            label=_("Input filename"),
            doc=_('File to load the certificate from.'),
            include='cli',
        ),
    )

    def forward(self, *args, **options):
        if self.api.env.context == 'cli':
            if 'certificate' in options and 'file' in options:
                raise errors.MutuallyExclusiveError(
                    reason=_("cannot specify both raw certificate and file"))
            if 'certificate' not in options and 'file' in options:
                options['certificate'] = x509.strip_header(options.pop('file'))

        return super(cert_find, self).forward(*args, **options)