Python class to work with Wordpress wp-config.php

wpconfig.py

# -*- coding: utf-8 -*-
"""
Manipulate a wp-config.php file.

MIT License

Copyright (c) 2017 Martin Bo Kristensen Grønholdt

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE
"""

import string
import random
import base64


class WPConfig(object):
    def __init__(self):
        # Set the initial value of all the fields in the config file, that this can change,

        self.db_name = ''
        self.db_user = ''
        self.db_passwd = ''
        self.db_host = ''
        self.db_charset = ''
        self.db_collate = ''

        self.auth_key = ''
        self.secure_auth_key = ''
        self.logged_in_key = ''
        self.nonce_key = ''
        self.auth_salt = ''
        self.secure_auth_salt = ''
        self.logged_in_salt = ''
        self.nonce_salt = ''

        self.table_prefix = ''

        # This is were a raw config file, read from disk is kept.
        self.raw_config = ''

    def _parse_value(self, start):
        """
        Read a config value with define PHP syntax.
        """
        start = start.replace(' ', '')
        start = start.replace('\t', '')
        # Run through every line.
        for i in range(0, len(self.raw_config)):
            # Remove spaces and tabs
            line = self.raw_config[i].replace(' ', '')
            line = line.replace('\t', '')

            if line.startswith(start):
                # We found the value.
                parts = line[len(start) - 1:-1].split("'")
                return parts[1]

        return False

    def _generate_salt(self, length=64):
        """
        Generate a new random salt.

        :param length: Length of the random string.
        :return:
        """
        chars = string.letters + string.digits + string.punctuation
        return base64.b64encode(''.join((random.choice(chars)) for x in range(length)))

    def read_config(self, path):
        """
        Read configuration values from a wp-config.php file.

        :param path: Path to the configuration file.
        :return: True on success.
        """
        try:
            with open(path, mode='r') as config_file:
                self.raw_config = config_file.readlines()
        except:
            print('Error loading configuration file: ' + path)
            return False

        value = self._parse_value("define('DB_NAME', '")
        if value != False:
            self.db_name = value
        else:
            return False

        value = self._parse_value("define('DB_USER', '")
        if value != False:
            self.db_user = value
        else:
            return False

        value = self._parse_value("define('DB_PASSWORD', '")
        if value != False:
            self.db_passwd = value
        else:
            return False

        value = self._parse_value("define('DB_HOST', '")
        if value != False:
            self.db_host = value
        else:
            return False

        value = self._parse_value("define('DB_CHARSET', '")
        if value != False:
            self.db_charset = value
        else:
            return False

        value = self._parse_value("define('DB_COLLATE', '")
        if value != False:
            self.db_collate = value
        else:
            return False

        value = self._parse_value("define('AUTH_KEY', '")
        if value != False:
            self.auth_key = value
        else:
            return False

        value = self._parse_value("define('SECURE_AUTH_KEY', '")
        if value != False:
            self.secure_auth_key = value
        else:
            return False

        value = self._parse_value("define('LOGGED_IN_KEY', '")
        if value != False:
            self.logged_in_key = value
        else:
            return False

        value = self._parse_value("define('NONCE_KEY', '")
        if value != False:
            self.nonce_key = value
        else:
            return False

        value = self._parse_value("define('AUTH_SALT', '")
        if value != False:
            self.auth_salt = value
        else:
            return False

        value = self._parse_value("define('SECURE_AUTH_SALT', '")
        if value != False:
            self.secure_auth_salt = value
        else:
            return False

        value = self._parse_value("define('LOGGED_IN_SALT', '")
        if value != False:
            self.logged_in_salt = value
        else:
            return False

        value = self._parse_value("define('NONCE_SALT', '")
        if value != False:
            self.nonce_salt = value
        else:
            return False

        value = self._parse_value("$table_prefix='")
        if value != False:
            self.table_prefix = value
        else:
            return False

        return True

    def write_config(self, path):
        """
        Write the configuration file to path, using the values stored in ths object.

        :param path: Path to the configuration file.
        :return: True on success.
        """
        config = """
<?php

define('DB_NAME', '{0}');

define('DB_USER', '{1}');

define('DB_PASSWORD', '{2}');

define('DB_HOST', '{3}');

define('DB_CHARSET', '{4}');

define('DB_COLLATE', '{5}');

define('AUTH_KEY',         '{6}');
define('SECURE_AUTH_KEY',  '{7}');
define('LOGGED_IN_KEY',    '{8}');
define('NONCE_KEY',        '{9}');
define('AUTH_SALT',        '{10}');
define('SECURE_AUTH_SALT', '{11}');
define('LOGGED_IN_SALT',   '{11}');
define('NONCE_SALT',       '{12}');

$table_prefix  = '{13}';

define('WP_DEBUG', false);

if ( !defined('ABSPATH') )
	define('ABSPATH', dirname(__FILE__) . '/');

require_once(ABSPATH . 'wp-settings.php');
""".format(self.db_name,
           self.db_user,
           self.db_passwd,
           self.db_host,
           self.db_charset,
           self.db_collate,
           self.auth_key,
           self.secure_auth_key,
           self.logged_in_key,
           self.nonce_key,
           self.auth_salt,
           self.logged_in_salt,
           self.nonce_salt,
           self.table_prefix)

        with open(path, mode='w') as config_file:
            config_file.write(config)

    def replace_salts(self):
        """
        Generate new salts for the config.
        """
        self.auth_key = self._generate_salt()
        self.secure_auth_key = self._generate_salt()
        self.logged_in_key = self._generate_salt()
        self.nonce_key = self._generate_salt()
        self.auth_salt = self._generate_salt()
        self.logged_in_salt = self._generate_salt()
        self.nonce_salt = self._generate_salt()