Virtual hosts generation command

access_landing/management/commands/vhosts.py

+# -*- coding: utf-8 -*-
+# Importazione dell'elenco dei corsi
+# Copyright (c) 2019 Marco Marinello <me@marcomarinello.it>
+#
+# 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, either version 3 of the License, or
+# (at your option) any later version.
+#
+# 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, see <http://www.gnu.org/licenses/>.
+
+
+from django.core.management.base import BaseCommand
+from access_landing import models
+import re
+
+
+class Command(BaseCommand):
+    help = "Generate virtual hosts for apache"
+
+
+    RE_IP_REGEX = "^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$"
+    RE_FQDN_REGEX = "^(([a-zA-Z]|[a-zA-Z][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z]|[A-Za-z][A-Za-z0-9\-]*[A-Za-z0-9])$"
+
+
+    def is_valid_fqdn_or_ip(self, s):
+        if s.startswith("http://"):
+            s = s[7:]
+        elif s.startswith("https://"):
+            s = s[8:]
+        return re.match(self.RE_IP_REGEX, s) or re.match(self.RE_FQDN_REGEX, s)
+
+
+    def gen_vhost(self, school):
+        return f"""<VirtualHost *:443>
+    ServerName {school.external_host}
+    ServerAdmin webmaster@{school.external_host}
+    DocumentRoot /var/www/html
+
+    Include /etc/apache2/ssl.conf
+
+    SSLProxyEngine on
+    ProxyVia on
+    ProxyPass / {school.internal_host}
+    ProxyPassReverse / {school.internal_host}
+    ProxyPreserveHost on
+</VirtualHost>
+"""
+
+
+    def handle(self, *args, **kwargs):
+        for school in models.Institute.objects.filter(active=True):
+            if self.is_valid_fqdn_or_ip(school.external_host) and \
+                self.is_valid_fqdn_or_ip(school.internal_host):
+                print(self.gen_vhost(school))