# Authors:
#     Endi S. Dewata <edewata@redhat.com>
#
# 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; version 2 of the License.
#
# 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Copyright (C) 2016 Red Hat, Inc.
# All rights reserved.
#

from __future__ import absolute_import
from __future__ import print_function
import getopt
import io
import ldap
import ldap.modlist
import ldif
import os
import shutil
import sys
import tempfile
import time

import pki.cli
import pki.server.cli.audit


TPS_VLV_PATH = '/usr/share/pki/tps/conf/vlv.ldif'
TPS_VLV_TASKS_PATH = '/usr/share/pki/tps/conf/vlvtasks.ldif'


class TPSCLI(pki.cli.CLI):

    def __init__(self):
        super(TPSCLI, self).__init__(
            'tps', 'TPS management commands')

        self.add_module(TPSCloneCLI())
        self.add_module(TPSDBCLI())
        self.add_module(pki.server.cli.audit.AuditCLI(self))


class TPSCloneCLI(pki.cli.CLI):

    def __init__(self):
        super(TPSCloneCLI, self).__init__(
            'clone', 'TPS clone management commands')

        self.add_module(TPSClonePrepareCLI())


class TPSClonePrepareCLI(pki.cli.CLI):

    def __init__(self):
        super(TPSClonePrepareCLI, self).__init__(
            'prepare', 'Prepare TPS clone')

    def print_help(self):
        print('Usage: pki-server tps-clone-prepare [OPTIONS]')
        print()
        print('  -i, --instance <instance ID>       Instance ID (default: pki-tomcat).')
        print('      --pkcs12-file <path>           PKCS #12 file to store certificates and keys.')
        print('      --pkcs12-password <password>   Password for the PKCS #12 file.')
        print('      --pkcs12-password-file <path>  File containing the PKCS #12 password.')
        print('  -v, --verbose                      Run in verbose mode.')
        print('      --help                         Show help message.')
        print()

    def execute(self, argv):

        try:
            opts, _ = getopt.gnu_getopt(argv, 'i:v', [
                'instance=', 'pkcs12-file=', 'pkcs12-password=', 'pkcs12-password-file=',
                'verbose', 'help'])

        except getopt.GetoptError as e:
            print('ERROR: ' + str(e))
            self.print_help()
            sys.exit(1)

        instance_name = 'pki-tomcat'
        pkcs12_file = None
        pkcs12_password = None

        for o, a in opts:
            if o in ('-i', '--instance'):
                instance_name = a

            elif o == '--pkcs12-file':
                pkcs12_file = a

            elif o == '--pkcs12-password':
                pkcs12_password = a

            elif o == '--pkcs12-password-file':
                with io.open(a, 'rb') as f:
                    pkcs12_password = f.read()

            elif o in ('-v', '--verbose'):
                self.set_verbose(True)

            elif o == '--help':
                self.print_help()
                sys.exit()

            else:
                print('ERROR: unknown option ' + o)
                self.print_help()
                sys.exit(1)

        if not pkcs12_file:
            print('ERROR: Missing PKCS #12 file')
            self.print_help()
            sys.exit(1)

        if not pkcs12_password:
            print('ERROR: Missing PKCS #12 password')
            self.print_help()
            sys.exit(1)

        instance = pki.server.PKIInstance(instance_name)
        if not instance.is_valid():
            print('ERROR: Invalid instance %s.' % instance_name)
            sys.exit(1)
        instance.load()

        subsystem = instance.get_subsystem('tps')
        if not subsystem:
            print("ERROR: No TPS subsystem in instance %s." % instance_name)
            sys.exit(1)

        tmpdir = tempfile.mkdtemp()

        try:
            pkcs12_password_file = os.path.join(tmpdir, 'pkcs12_password.txt')
            with open(pkcs12_password_file, 'w') as f:
                f.write(pkcs12_password)

            subsystem.export_system_cert(
                'subsystem', pkcs12_file, pkcs12_password_file, new_file=True)
            subsystem.export_system_cert(
                'signing', pkcs12_file, pkcs12_password_file)
            subsystem.export_system_cert(
                'audit_signing', pkcs12_file, pkcs12_password_file)
            instance.export_external_certs(pkcs12_file, pkcs12_password_file)

        finally:
            shutil.rmtree(tmpdir)


class TPSDBCLI(pki.cli.CLI):

    def __init__(self):
        super(TPSDBCLI, self).__init__(
            'db', 'TPS database management commands')

        self.add_module(TPSDBVLVCLI())


class TPSDBVLVCLI(pki.cli.CLI):

    def __init__(self):
        super(TPSDBVLVCLI, self).__init__(
            'vlv', 'TPS VLV management commands')

        self.add_module(TPSDBVLVFindCLI())
        self.add_module(TPSDBVLVAddCLI())
        self.add_module(TPSDBVLVDeleteCLI())
        self.add_module(TPSDBVLVReindexCLI())


class TPSDBVLVFindCLI(pki.cli.CLI):

    def __init__(self):
        super(TPSDBVLVFindCLI, self).__init__(
            'find', 'Find TPS VLVs')

    def print_help(self):
        print('Usage: pki-server tps-db-vlv-find [OPTIONS]')
        print()
        print('  -i, --instance <instance ID>       Instance ID (default: pki-tomcat).')
        print('  -D, --bind-dn <Bind DN>            Connect DN (default: cn=Directory Manager).')
        print('  -w, --bind-password <password>     Password to connect to database.')
        print('  -v, --verbose                      Run in verbose mode.')
        print('      --help                         Show help message.')
        print()

    def execute(self, argv):
        try:
            opts, _ = getopt.gnu_getopt(
                argv,
                'i:D:w:x:g:v',
                ['instance=', 'bind-dn=', 'bind-password=', 'generate-ldif=',
                 'verbose', 'help']
            )

        except getopt.GetoptError as e:
            print('ERROR: ' + str(e))
            self.print_help()
            sys.exit(1)

        instance_name = 'pki-tomcat'
        bind_dn = None
        bind_password = None

        for o, a in opts:
            if o in ('-i', '--instance'):
                instance_name = a

            elif o in ('-D', '--bind-dn'):
                bind_dn = a

            elif o in ('-w', '--bind-password'):
                bind_password = a

            elif o in ('-v', '--verbose'):
                self.set_verbose(True)

            elif o == '--help':
                self.print_help()
                sys.exit()

            else:
                print('ERROR: unknown option ' + o)
                self.print_help()
                sys.exit(1)

        instance = pki.server.PKIInstance(instance_name)
        if not instance.is_valid():
            print('ERROR: Invalid instance %s.' % instance_name)
            sys.exit(1)
        instance.load()

        subsystem = instance.get_subsystem('tps')
        if not subsystem:
            print("ERROR: No TPS subsystem in instance %s." % instance_name)
            sys.exit(1)

        self.find_vlv(subsystem, bind_dn, bind_password)

    def find_vlv(self, subsystem, bind_dn, bind_password):

        conn = subsystem.open_database(bind_dn=bind_dn,
                                       bind_password=bind_password)

        try:
            database = subsystem.config['internaldb.database']
            base_dn = 'cn=' + database + ',cn=ldbm database, cn=plugins, cn=config'

            if self.verbose:
                print('Searching %s' % base_dn)

            entries = conn.ldap.search_s(
                base_dn,
                ldap.SCOPE_SUBTREE,
                '(|(objectClass=vlvSearch)(objectClass=vlvIndex))')

            self.print_message('%d entries found' % len(entries))

            if not entries:
                return

            first = True
            for entry in entries:
                dn = entry[0]
                attrs = entry[1]

                if first:
                    first = False
                else:
                    print()

                print('  dn: %s' % dn)
                for key, values in attrs.items():
                    for value in values:
                        print('  %s: %s' % (key, value))

        finally:
            conn.close()


class TPSDBVLVAddCLI(pki.cli.CLI):

    def __init__(self):
        super(TPSDBVLVAddCLI, self).__init__(
            'add', 'Add TPS VLVs')

    def print_help(self):
        print('Usage: pki-server tps-db-vlv-add [OPTIONS]')
        print()
        print('  -i, --instance <instance ID>       Instance ID (default: pki-tomcat).')
        print('  -D, --bind-dn <Bind DN>            Connect DN (default: cn=Directory Manager).')
        print('  -w, --bind-password <password>     Password to connect to database.')
        print('  -g, --generate-ldif <outfile>      Generate LDIF of required changes.')
        print('  -v, --verbose                      Run in verbose mode.')
        print('      --help                         Show help message.')
        print()

    def execute(self, argv):
        try:
            opts, _ = getopt.gnu_getopt(
                argv,
                'i:D:w:x:g:v',
                ['instance=', 'bind-dn=', 'bind-password=', 'generate-ldif=',
                 'verbose', 'help']
            )

        except getopt.GetoptError as e:
            print('ERROR: ' + str(e))
            self.print_help()
            sys.exit(1)

        instance_name = 'pki-tomcat'
        bind_dn = 'cn=Directory Manager'
        bind_password = None
        out_file = None

        for o, a in opts:
            if o in ('-i', '--instance'):
                instance_name = a

            elif o in ('-D', '--bind-dn'):
                bind_dn = a

            elif o in ('-w', '--bind-password'):
                bind_password = a

            elif o in ('-g', '--generate-ldif'):
                out_file = a

            elif o in ('-v', '--verbose'):
                self.set_verbose(True)

            elif o == '--help':
                self.print_help()
                sys.exit()

            else:
                print('ERROR: unknown option ' + o)
                self.print_help()
                sys.exit(1)

        instance = pki.server.PKIInstance(instance_name)
        if not instance.is_valid():
            print('ERROR: Invalid instance %s.' % instance_name)
            sys.exit(1)
        instance.load()

        subsystem = instance.get_subsystem('tps')
        if not subsystem:
            print("ERROR: No TPS subsystem in instance %s." % instance_name)
            sys.exit(1)

        if out_file:
            self.generate_ldif(subsystem, out_file)
            return

        self.add_vlv(subsystem, bind_dn, bind_password)

    def generate_ldif(self, subsystem, out_file):
        subsystem.customize_file(TPS_VLV_PATH, out_file)
        self.print_message('Output: %s' % out_file)

    def add_vlv(self, subsystem, bind_dn, bind_password):

        input_file = tempfile.NamedTemporaryFile(delete=False)

        try:
            subsystem.customize_file(TPS_VLV_PATH, input_file.name)

            conn = subsystem.open_database(bind_dn=bind_dn,
                                           bind_password=bind_password)

            try:
                parser = ldif.LDIFRecordList(open(input_file.name, 'rb'))
                parser.parse()

                for dn, entry in parser.all_records:

                    if self.verbose:
                        print('Adding %s' % dn)

                    add_modlist = ldap.modlist.addModlist(entry)
                    conn.ldap.add_s(dn, add_modlist)

            finally:
                conn.close()

        finally:
            os.unlink(input_file.name)

        self.print_message('VLVs added')


class TPSDBVLVDeleteCLI(pki.cli.CLI):

    def __init__(self):
        super(TPSDBVLVDeleteCLI, self).__init__(
            'del', 'Delete TPS VLVs')

    def print_help(self):
        print('Usage: pki-server tps-db-vlv-del [OPTIONS]')
        print()
        print('  -i, --instance <instance ID>       Instance ID (default: pki-tomcat).')
        print('  -D, --bind-dn <Bind DN>            Connect DN (default: cn=Directory Manager).')
        print('  -w, --bind-password <password>     Password to connect to DB.')
        print('  -g, --generate-ldif <outfile>      Generate LDIF of required changes.')
        print('  -v, --verbose                      Run in verbose mode.')
        print('      --help                         Show help message.')
        print()

    def execute(self, argv):
        try:
            opts, _ = getopt.gnu_getopt(
                argv,
                'i:D:w:x:g:v',
                ['instance=', 'bind-dn=', 'bind-password=', 'generate-ldif=',
                 'verbose', 'help']
            )

        except getopt.GetoptError as e:
            print('ERROR: ' + str(e))
            self.print_help()
            sys.exit(1)

        instance_name = 'pki-tomcat'
        bind_dn = None
        bind_password = None
        out_file = None

        for o, a in opts:
            if o in ('-i', '--instance'):
                instance_name = a

            elif o in ('-D', '--bind-dn'):
                bind_dn = a

            elif o in ('-w', '--bind-password'):
                bind_password = a

            elif o in ('-g', '--generate-ldif'):
                out_file = a

            elif o in ('-v', '--verbose'):
                self.set_verbose(True)

            elif o == '--help':
                self.print_help()
                sys.exit()

            else:
                print('ERROR: unknown option ' + o)
                self.print_help()
                sys.exit(1)

        instance = pki.server.PKIInstance(instance_name)
        if not instance.is_valid():
            print('ERROR: Invalid instance %s.' % instance_name)
            sys.exit(1)
        instance.load()

        subsystem = instance.get_subsystem('tps')
        if not subsystem:
            print("ERROR: No TPS subsystem in instance %s." % instance_name)
            sys.exit(1)

        if out_file:
            self.generate_ldif(subsystem, out_file)
            return

        self.delete_vlv(subsystem, bind_dn, bind_password)

    def generate_ldif(self, subsystem, out_file):

        tmp_file = tempfile.NamedTemporaryFile(delete=False)

        try:
            subsystem.customize_file(TPS_VLV_PATH, tmp_file.name)

            parser = ldif.LDIFRecordList(open(tmp_file.name, 'rb'))
            parser.parse()

            with open(out_file, 'w') as outfile:

                writer = ldif.LDIFWriter(outfile)

                for dn, _ in reversed(parser.all_records):
                    entry = {'changetype': ['delete']}
                    writer.unparse(dn, entry)

            self.print_message('Output: %s' % out_file)

        finally:
            os.unlink(tmp_file.name)

    def delete_vlv(self, subsystem, bind_dn, bind_password):

        conn = subsystem.open_database(bind_dn=bind_dn,
                                       bind_password=bind_password)
        try:
            database = subsystem.config['internaldb.database']
            base_dn = 'cn=' + database + ',cn=ldbm database, cn=plugins, cn=config'

            if self.verbose:
                print('Searching %s' % base_dn)

            entries = conn.ldap.search_s(
                base_dn,
                ldap.SCOPE_SUBTREE,
                '(|(objectClass=vlvSearch)(objectClass=vlvIndex))')

            if not entries:
                self.print_message('VLVs not found')
                return

            for entry in reversed(entries):
                dn = entry[0]

                if self.verbose:
                    print('Deleting %s' % dn)

                conn.ldap.delete_s(dn)

        finally:
            conn.close()

        self.print_message('VLVs deleted')


class TPSDBVLVReindexCLI(pki.cli.CLI):

    def __init__(self):
        super(TPSDBVLVReindexCLI, self).__init__(
            'reindex', 'Re-index TPS VLVs')

    def print_help(self):
        print('Usage: pki-server tps-db-vlv-reindex [OPTIONS]')
        print()
        print('  -i, --instance <instance ID>       Instance ID (default: pki-tomcat).')
        print('  -D, --bind-dn <Bind DN>            Connect DN (default: cn=Directory Manager).')
        print('  -w, --bind-password <password>     Password to connect to database.')
        print('  -g, --generate-ldif <outfile>      Generate LDIF of required changes.')
        print('  -v, --verbose                      Run in verbose mode.')
        print('      --help                         Show help message.')
        print()

    def execute(self, argv):
        try:
            opts, _ = getopt.gnu_getopt(
                argv,
                'i:D:w:x:g:v',
                ['instance=', 'bind-dn=', 'bind-password=', 'generate-ldif=',
                 'verbose', 'help']
            )

        except getopt.GetoptError as e:
            print('ERROR: ' + str(e))
            self.print_help()
            sys.exit(1)

        instance_name = 'pki-tomcat'
        bind_dn = 'cn=Directory Manager'
        bind_password = None
        out_file = None

        for o, a in opts:
            if o in ('-i', '--instance'):
                instance_name = a

            elif o in ('-D', '--bind-dn'):
                bind_dn = a

            elif o in ('-w', '--bind-password'):
                bind_password = a

            elif o in ('-g', '--generate-ldif'):
                out_file = a

            elif o in ('-v', '--verbose'):
                self.set_verbose(True)

            elif o == '--help':
                self.print_help()
                sys.exit()

            else:
                print('ERROR: unknown option ' + o)
                self.print_help()
                sys.exit(1)

        instance = pki.server.PKIInstance(instance_name)
        if not instance.is_valid():
            print('ERROR: Invalid instance %s.' % instance_name)
            sys.exit(1)
        instance.load()

        subsystem = instance.get_subsystem('tps')
        if not subsystem:
            print("ERROR: No TPS subsystem in instance %s." % instance_name)
            sys.exit(1)

        if out_file:
            self.generate_ldif(subsystem, out_file)
            return

        self.reindex_vlv(subsystem, bind_dn, bind_password)

    def generate_ldif(self, subsystem, out_file):
        subsystem.customize_file(TPS_VLV_TASKS_PATH, out_file)
        self.print_message('Output: %s' % out_file)

    def reindex_vlv(self, subsystem, bind_dn, bind_password):

        input_file = tempfile.NamedTemporaryFile(delete=False)
        subsystem.customize_file(TPS_VLV_TASKS_PATH, input_file.name)

        conn = subsystem.open_database(bind_dn=bind_dn,
                                       bind_password=bind_password)

        try:
            parser = ldif.LDIFRecordList(open(input_file.name, 'rb'))
            parser.parse()

            for dn, entry in parser.all_records:

                if self.verbose:
                    print('Adding %s' % dn)

                add_modlist = ldap.modlist.addModlist(entry)
                conn.ldap.add_s(dn, add_modlist)

                while True:
                    time.sleep(1)

                    try:
                        if self.verbose:
                            print('Checking %s' % dn)

                        conn.ldap.search_s(dn, ldap.SCOPE_BASE)
                    except ldap.NO_SUCH_OBJECT:
                        break

        finally:
            os.unlink(input_file.name)
            conn.close()

        self.print_message('Reindex complete')