Add letsencrypt support in the nginx container

nginx/config.py

@@ -0,0 +1,27 @@
+#!/usr/bin/python
+
+import jinja2
+import os
+import socket
+	
+convert = lambda src, dst, args: open(dst, "w").write(jinja2.Template(open(src).read()).render(**args))
+
+args = os.environ.copy()
+
+if "ADMIN_ADDRESS" not in os.environ:
+    args["ADMIN_ADDRESS"] = socket.gethostbyname("admin")
+
+args["TLS"] = {
+    "cert": ("/certs/cert.pem", "/certs/key.pem"),
+    "letsencrypt": ("/certs/letsencrypt/live/mailu/fullchain.pem",
+        "/certs/letsencrypt/live/mailu/privkey.pem"),
+    "notls": None
+}[args["TLS_FLAVOR"]]
+
+if args["TLS"] and not all(os.path.exists(file_path) for file_path in args["TLS"]):
+    print("Missing cert or key file, disabling TLS")
+    args["TLS_ERROR"] = "yes"
+
+
+convert("/conf/nginx.conf", "/etc/nginx/nginx.conf", args)
+os.system("nginx -s reload")