Make an A record on Cloudflare and generate corresponding Apache2 reverse proxy site file

create_reverse_proxy_dns.py

import CloudFlare
import argparse

CLOUDFLARE_API_KEY = "XXXXXXX"

parser = argparse.ArgumentParser(description="Make a reverse proxy file and CloudFlare DNS entry")
parser.add_argument('subdomain',
                    type=str,
                    help='new subdomain prefix')
parser.add_argument('domain',
                    type=str,
                    help='Base domain')
parser.add_argument('external_ip',
                    type=str,
                    help="External IP address")
parser.add_argument('-6',
                    '--ipv6',
                    action='store_true',
                    help="Use IPV6 address")
parser.add_argument('destination',
                    type=str,
                    help="Destination of proxy (ex. http://192.168.1.1:80")
args = parser.parse_args()

template = """
<VirtualHost *:80>
    ServerName {subdomain}.{domain}

    Redirect permanent / https://{subdomain}.{domain}/

    ErrorLog /var/log/apache2/{domain}-error.log
    CustomLog /var/log/apache2/{domain}-access.log combined
</VirtualHost>

<VirtualHost *:443>
    ServerName {subdomain}.{domain}

    ProxyPreserveHost On

    ProxyPass "/" "{localip}/"
    ProxyPassReverse "/" "{localip}/"

    SSLEngine on
    Protocols h2 http/1.1

    ErrorLog /var/log/apache2/{domain}-error.log
    CustomLog /var/log/apache2/{domain}-access.log combined
    Include /etc/letsencrypt/options-ssl-apache.conf
    SSLCertificateFile /etc/letsencrypt/live/{domain}/fullchain.pem
    SSLCertificateKeyFile /etc/letsencrypt/live/{domain}/privkey.pem
</VirtualHost>
"""

def write_to_file(string, filename):
    with open(filename, 'w+') as f:
        f.write(string)

def make_dns_record(subdomain, zone_id, ip_address, IPV6: bool = False):
    new_record = {'name': subdomain, 'type': ('AAAA' if IPV6 else 'A'), 'content': ip_address}
    if not cf.zones.dns_records.post(zone_id, data=new_record):
        raise Exception("Could not make DNS entry on CloudFlare.")

cf = CloudFlare.CloudFlare(token=CLOUDFLARE_API_KEY)
zone_id = cf.zones.get(params = {'name':args.domain,'per_page':1})[0]['id']
make_dns_record(subdomain=args.subdomain, zone_id=zone_id, ip_address=args.external_ip, IPV6=args.ipv6)
proxy_entry = template.format(subdomain=args.subdomain, domain=args.domain, localip=args.destination)
write_to_file(string=proxy_entry, filename=f"/etc/apache2/sites-available/{args.subdomain}-{args.domain}.conf")