[Nginx] Use jinja2 for templating nginx configuration

data/Dockerfiles/nginx/Dockerfile

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+FROM nginx:alpine
+LABEL maintainer "The Infrastructure Company GmbH <info@servercow.de>"
+
+ENV PIP_BREAK_SYSTEM_PACKAGES=1
+
+RUN apk add --no-cache nginx \
+  python3 \
+  py3-pip && \
+  pip install --upgrade pip && \
+  pip install Jinja2
+
+RUN mkdir -p /etc/nginx/includes
+
+COPY ./bootstrap.py /
+COPY ./docker-entrypoint.sh /
+
+ENTRYPOINT ["/docker-entrypoint.sh"]
+CMD ["nginx", "-g", "daemon off;"]

data/Dockerfiles/nginx/bootstrap.py

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+import os
+import subprocess
+from jinja2 import Environment, FileSystemLoader
+
+
+def sites_default_conf(env, template_vars):
+  config_name = "sites-default.conf"
+  template = env.get_template(f"{config_name}.j2")
+  config = template.render(template_vars)
+
+  with open(f"/etc/nginx/includes/{config_name}", "w") as f:
+    f.write(config)
+
+def nginx_conf(env, template_vars):
+  config_name = "nginx.conf"
+  template = env.get_template(f"{config_name}.j2")
+  config = template.render(template_vars)
+
+  with open(f"/etc/nginx/{config_name}", "w") as f:
+    f.write(config)
+
+def prepare_template_vars():
+  template_vars = {
+    'IPV4_NETWORK': os.getenv("IPV4_NETWORK", "172.22.1"),
+    'TRUSTED_NETWORK': os.getenv("TRUSTED_NETWORK", False),
+    'SKIP_RSPAMD': os.getenv("SKIP_RSPAMD", "n").lower() in ("y", "yes"),
+    'SKIP_SOGO': os.getenv("SKIP_SOGO", "n").lower() in ("y", "yes"),
+    'NGINX_USE_PROXY_PROTOCOL': os.getenv("NGINX_USE_PROXY_PROTOCOL", "n").lower() in ("y", "yes"),
+    'MAILCOW_HOSTNAME': os.getenv("MAILCOW_HOSTNAME", ""),
+    'ADDITIONAL_SERVER_NAMES': os.getenv("ADDITIONAL_SERVER_NAMES", "").replace(',', ' '),
+    'HTTP_PORT': os.getenv("HTTP_PORT", "80"),
+    'HTTPS_PORT': os.getenv("HTTPS_PORT", "443"),
+    'SOGOHOST': os.getenv("SOGOHOST", "sogo-mailcow"),
+    'RSPAMDHOST': os.getenv("RSPAMDHOST", "rspamd-mailcow"),
+    'PHPFPMHOST': os.getenv("PHPFPMHOST", "php-fpm-mailcow"),
+  }
+
+  ssl_dir = '/etc/ssl/mail/'
+  template_vars['valid_cert_dirs'] = []
+  for d in os.listdir(ssl_dir):
+    full_path = os.path.join(ssl_dir, d)
+    if not os.path.isdir(full_path):
+      continue
+
+    cert_path = os.path.join(full_path, 'cert.pem')
+    key_path = os.path.join(full_path, 'key.pem')
+    domains_path = os.path.join(full_path, 'domains')
+
+    if os.path.isfile(cert_path) and os.path.isfile(key_path) and os.path.isfile(domains_path):
+      with open(domains_path, 'r') as file:
+        domains = file.read().strip()
+      domains_list = domains.split()
+      if domains_list and template_vars["MAILCOW_HOSTNAME"] not in domains_list:
+        template_vars['valid_cert_dirs'].append({
+          'cert_path': full_path + '/',
+          'domains': domains
+        })
+
+  return template_vars
+
+def main():
+  env = Environment(loader=FileSystemLoader('./etc/nginx/conf.d'))
+
+  # Render config
+  print("Render config")
+  template_vars = prepare_template_vars()
+  sites_default_conf(env, template_vars)
+  nginx_conf(env, template_vars)
+
+  # Validate config
+  print("Validate config")
+  subprocess.run(["nginx", "-qt"])
+
+
+if __name__ == "__main__":
+  main()

data/Dockerfiles/nginx/docker-entrypoint.sh

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+#!/bin/sh
+
+until ping ${REDISHOST} -c1 > /dev/null; do
+  echo "Waiting for Redis..."
+  sleep 1
+done
+until ping ${PHPFPMHOST} -c1 > /dev/null; do
+  echo "Waiting for PHP..."
+  sleep 1
+done
+if printf "%s\n" "${SKIP_SOGO}" | grep -E '^([yY][eE][sS]|[yY])+$' >/dev/null; then
+  until ping ${SOGOHOST} -c1 > /dev/null; do
+    echo "Waiting for SOGo..."
+    sleep 1
+  done
+fi
+if printf "%s\n" "${SKIP_RSPAMD}" | grep -E '^([yY][eE][sS]|[yY])+$' >/dev/null; then
+  until ping ${RSPAMDHOST} -c1 > /dev/null; do
+    echo "Waiting for Rspamd..."
+    sleep 1
+  done
+fi
+
+python3 /bootstrap.py
+
+exec "$@"