Add support for custom external HTTP/HTTPS ports (see https://groups.google.com/forum/#!topic/nginx-proxy/0I2jevmgTLI)

Author: nanawel

nginx.tmpl

@@ -1,5 +1,8 @@
 {{ $CurrentContainer := where $ "ID" .Docker.CurrentContainerID | first }}
 
+{{ $external_http_port := coalesce $.Env.HTTP_PORT "80" }}
+{{ $external_https_port := coalesce $.Env.HTTPS_PORT "443" }}
+
 {{ define "upstream" }}
 	{{ if .Address }}
 		{{/* If we got the containers from swarm and this container's port is published to host, use host IP:PORT */}}
@@ -138,9 +141,9 @@ proxy_set_header Proxy "";
 {{ $enable_ipv6 := eq (or ($.Env.ENABLE_IPV6) "") "true" }}
 server {
 	server_name _; # This is just an invalid value which will never trigger on a real hostname.
-	listen 80;
+	listen {{ $external_http_port }};
 	{{ if $enable_ipv6 }}
-	listen [::]:80;
+	listen [::]:{{ $external_http_port }};
 	{{ end }}
 	access_log /var/log/nginx/access.log vhost;
 	return 503;
@@ -149,9 +152,9 @@ server {
 {{ if (and (exists "/etc/nginx/certs/default.crt") (exists "/etc/nginx/certs/default.key")) }}
 server {
 	server_name _; # This is just an invalid value which will never trigger on a real hostname.
-	listen 443 ssl http2;
+	listen {{ $external_https_port }} ssl http2;
 	{{ if $enable_ipv6 }}
-	listen [::]:443 ssl http2;
+	listen [::]:{{ $external_https_port }} ssl http2;
 	{{ end }}
 	access_log /var/log/nginx/access.log vhost;
 	return 503;
@@ -241,9 +244,9 @@ upstream {{ $upstream_name }} {
 {{ if eq $https_method "redirect" }}
 server {
 	server_name {{ $host }};
-	listen 80 {{ $default_server }};
+	listen {{ $external_http_port }} {{ $default_server }};
 	{{ if $enable_ipv6 }}
-	listen [::]:80 {{ $default_server }};
+	listen [::]:{{ $external_http_port }} {{ $default_server }};
 	{{ end }}
 	access_log /var/log/nginx/access.log vhost;
 	return 301 https://$host$request_uri;
@@ -252,9 +255,9 @@ server {
 
 server {
 	server_name {{ $host }};
-	listen 443 ssl http2 {{ $default_server }};
+	listen {{ $external_https_port }} ssl http2 {{ $default_server }};
 	{{ if $enable_ipv6 }}
-	listen [::]:443 ssl http2 {{ $default_server }};
+	listen [::]:{{ $external_https_port }} ssl http2 {{ $default_server }};
 	{{ end }}
 	access_log /var/log/nginx/access.log vhost;
 
@@ -322,7 +325,7 @@ server {
 
 server {
 	server_name {{ $host }};
-	listen 80 {{ $default_server }};
+	listen {{ $external_http_port }} {{ $default_server }};
 	{{ if $enable_ipv6 }}
 	listen [::]:80 {{ $default_server }};
 	{{ end }}
@@ -365,9 +368,9 @@ server {
 {{ if (and (not $is_https) (exists "/etc/nginx/certs/default.crt") (exists "/etc/nginx/certs/default.key")) }}
 server {
 	server_name {{ $host }};
-	listen 443 ssl http2 {{ $default_server }};
+	listen {{ $external_https_port }} ssl http2 {{ $default_server }};
 	{{ if $enable_ipv6 }}
-	listen [::]:443 ssl http2 {{ $default_server }};
+	listen [::]:{{ $external_https_port }} ssl http2 {{ $default_server }};
 	{{ end }}
 	access_log /var/log/nginx/access.log vhost;
 	return 500;