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Editing: cllicenselib.py

# -*- coding: utf-8 -*-

# CL LICENSE CHECK python lib

#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT

# CLASSES:
#
# LicenseData - main class for CL licence check
# : check_license
# : get_ip
# : date_format
# : open_letter_template
# : format_letter
#
# FUNCTIONS:
#
# License update cron              : update_license_timestamp_file
# License update new key           : update license with new key
# Check license                    : check_license
# Return Last License check date   : last_license_check
# Return Template to display       : return_template_to_display

import datetime
import os
import socket
import struct
import subprocess
import sys
import time
from urllib import error, request

import cldetectlib as detect
from clcommon.utils import mod_makedirs

RHN_CHECK_FILE = '/usr/sbin/rhn_check'
RHN_UPDATE_NEW_KEY = '/usr/sbin/rhnreg_ks'
LICENSE_TIMESTAMP_FILE = '/var/lve/lveinfo.ver'
LICENSE_TIMESTAMP_DIR = os.path.dirname(LICENSE_TIMESTAMP_FILE)
RHN_DIRECTORY = '/etc/sysconfig/rhn'
RHN_SYSTEMID = os.path.join(RHN_DIRECTORY, 'systemid')
JWT_TOKEN = os.path.join(RHN_DIRECTORY, 'jwt.token')
JWT_TOKEN_TIMESTAMP_FILE = os.path.join(LICENSE_TIMESTAMP_DIR, 'jwt_last_update_ts')

CACHE_TIME = 259200  # 3 days
JWT_UPDATE_INTERVAL = 3600 * 4

NO_VALID_LICENSE_FOUND_TEMPLATE = '/usr/share/cloudlinux/no_valid_license_screen.txt'
LICENSE_OUT_OF_DATE_EMAIL_TEMPLATE = '/usr/share/cloudlinux/license_out_of_date_email.txt'

TEMPLATES = {
    'Email': {
        'template_file': LICENSE_OUT_OF_DATE_EMAIL_TEMPLATE,
        'error_msg': 'Error: License out of date, email template missing.',
    },
    'NoValid': {
        'template_file': NO_VALID_LICENSE_FOUND_TEMPLATE,
        'error_msg': 'Error: No valid license found, template is missing.',
    },
}

SHOW_IP_LINK = 'http://cloudlinux.com/showip.php'

# License Data Class
class LicenseData:
    _license_last_timestamp = ''
    _server_ip = ''
    _letter_template = ''

@staticmethod
    def _is_license_needs_update(license_timestamp_file):
        """
        Update license when:

in case JWT token present:
        - if no timestamp file with jwt token last update time
        - if jwt token was not updated during last 4 hours
        - if jwt token was updated later than our timestamp in file

in case JWT token is not present, but systemid exists
        (fallback for licensing w/o token)
        - update license only if systemid was changed after last timestamp update

when no jwt and no systemid - re-update license
        """
        if os.path.exists(JWT_TOKEN):
            if not os.path.exists(JWT_TOKEN_TIMESTAMP_FILE):
                return True
            rhn_updated = int(os.path.getmtime(JWT_TOKEN))
            if rhn_updated < int(time.time()) - JWT_UPDATE_INTERVAL:
                return True
            jwt_last_update_timestamp = read_time_from_file(JWT_TOKEN_TIMESTAMP_FILE)
            if jwt_last_update_timestamp < rhn_updated:
                return True
            return False
        if os.path.exists(RHN_SYSTEMID):
            rhn_updated = os.path.getmtime(RHN_SYSTEMID)
            return rhn_updated > os.path.getmtime(license_timestamp_file)
        return True

def check_license(self, license_timestamp_file):
        """
        Checks license:
        1. Reads cache file with timestamp
        2. Ensures license must be re-checked:
            - if timestamp in cache file > CACHE_TIME ->
            check if we need to re-update licensing
        """
        try:
            # Get timestamp of last license check
            self._license_last_timestamp = read_time_from_file(license_timestamp_file)
            if (int(time.time()) - self._license_last_timestamp) > CACHE_TIME:
                if self._is_license_needs_update(license_timestamp_file):
                    return update_license_timestamp_file()
                # because if server does not have jwt token and license is not needed update
                # consider no license
                return os.path.exists(JWT_TOKEN)
            return True
        except (IOError, struct.error):
            return False

# Get IP
    def get_ip(self):
        if not self._server_ip:
            try:
                with request.urlopen(SHOW_IP_LINK) as response:
                    self._server_ip = response.read().decode('utf-8').strip()
            except error.URLError as e:
                print('Error: Get server IP. ' + str(e))
                sys.exit(1)

# Format Date
    def date_format(self, format):
        return datetime.datetime.fromtimestamp(self._license_last_timestamp).strftime(format)

# Open letter template
    def open_letter_template(self, template):
        try:
            with open(template, 'r', encoding='utf-8') as f:
                self._letter_template = f.read()
        except IOError as e:
            print('Error: Failed to open template file. ' + str(e))
            sys.exit(1)

# Format Screen
    def format_letter(self):
        admin_email = detect.getCPAdminEmail()
        if not admin_email:
            return None

self.get_ip()
        if not self._license_last_timestamp:
            return (
                self._letter_template.replace('%LIC_DATE%', '')
                .replace('%IP%', self._server_ip)
                .replace('%HOSTNAME%', socket.gethostname())
                .replace('%FROM%', admin_email)
            )

return (
            self._letter_template.replace('%LIC_DATE%', ' since ' + self.date_format('%b %d, %y'))
            .replace('%IP%', self._server_ip)
            .replace('%HOSTNAME%', socket.gethostname())
            .replace('%FROM%', admin_email)
        )

# License Data Class Object
License = LicenseData()

def read_time_from_file(file: str):
    with open(file, 'rb') as f:
        return struct.unpack('i', f.read())[0]

def write_time_to_file(file: str, timestamp: int):
    with open(file, 'wb') as f:
        f.write(struct.pack('i', timestamp))

# License update cron
def update_license_timestamp_file():
    try:
        if not os.path.isdir(LICENSE_TIMESTAMP_DIR):
            mod_makedirs(LICENSE_TIMESTAMP_DIR, 0o755)
        with subprocess.Popen(
            [RHN_CHECK_FILE],
            stdout=subprocess.PIPE,
            stderr=subprocess.STDOUT,
        ) as proc:
            proc.communicate()
            if proc.returncode == 0:
                write_time_to_file(LICENSE_TIMESTAMP_FILE, int(time.time()))
                if os.path.exists(JWT_TOKEN):
                    write_time_to_file(JWT_TOKEN_TIMESTAMP_FILE, int(os.path.getmtime(JWT_TOKEN)))
                return True
            return False
    except (OSError, IOError):
        return False

# update license with new key
def update_license_with_key(key):
    try:
        if not os.path.isdir(LICENSE_TIMESTAMP_DIR):
            mod_makedirs(LICENSE_TIMESTAMP_DIR, 0o755)
        with subprocess.Popen(
            [RHN_UPDATE_NEW_KEY, '--activationkey=' + key, '--force'],
            stdout=subprocess.PIPE,
            stderr=subprocess.STDOUT,
        ) as proc:
            out, _ = proc.communicate()
            if proc.returncode == 0:
                write_time_to_file(LICENSE_TIMESTAMP_FILE, int(time.time()))
                if os.path.exists(JWT_TOKEN):
                    write_time_to_file(JWT_TOKEN_TIMESTAMP_FILE, int(os.path.getmtime(JWT_TOKEN)))
                print('OK')
                return True

print(out.strip())
            return False
    except (OSError, IOError):
        print('Error: New key activation failed, please try again later.')
        return False

# Returns:
# True == license is Ok
# False == license expired or not found
def check_license():
    # Check for license timestamp file in /var/lve/lveinfo.ver
    if os.path.isfile(LICENSE_TIMESTAMP_FILE):
        return License.check_license(LICENSE_TIMESTAMP_FILE)
    # try to re-update license file if jwt token is present
    # or systemid file as fallback when jwt absent (goDaddy)
    if os.path.exists(JWT_TOKEN) or os.path.exists(RHN_SYSTEMID):
        return update_license_timestamp_file()
    return False

# Return Last license check Date
def last_license_check(is_valid):
    if is_valid:
        return 'OK'
    # Check for license timestamp file in /var/lve/lveinfo.ver
    if os.path.isfile(LICENSE_TIMESTAMP_FILE):
        return 'No valid license found, last successful check was on ' + License.date_format('%b %d, %y')
    return 'No valid license found.'

def get_email_template():
    return get_template_to_display(TEMPLATES['Email'])

def get_novalid_template():
    return get_template_to_display(TEMPLATES['NoValid'])

# Return Template Email, No Valid license found template.
def get_template_to_display(template):
    # check for template in /usr/share/cloudlinux
    if not os.path.isfile(template['template_file']):
        return template['error_msg']

if not check_license():
        # set template text into License class attr.
        License.open_letter_template(template['template_file'])

# Return Formatted Template
        return License.format_letter()

return None

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