{{ define "http_default_host" }}
	server {
		{{ template "server_basic_settings" (dict "host" .host) }}
		return {{ coalesce .error_code "500" }};
	}
{{ end }}


{{ define "https_default_host" }}
	{{ if and (exists "/etc/nginx/certs/default.crt") (exists "/etc/nginx/certs/default.key") }}
		server {
			{{ template "server_basic_settings" (dict "host" .host "secure" true "default_server" .default_server) }}
			{{ template "server_ssl_settings" (dict "cert" "default") }}
			return {{ coalesce .error_code "500" }};
		}
	{{ end }}
{{ end }}


{{ define "server" }}
	{{ $me   := .me }}
	{{ $host := .host }}
	{{ $port := .port }}
	{{ $port_containers := coalesce .port_containers dict }}

	{{ $root_container_map := dict "/" (whereNotExist $port_containers "Env.VIRTUAL_PATH") }}
	{{ $path_container_map := groupBy $port_containers "Env.VIRTUAL_PATH" }}

	{{ $is_default_port := eq $port "default" }}

	{{ $default_host   := or $.Env.DEFAULT_HOST "" }}
	{{ $default_server := index (dict $host "" $default_host "default_server") $host }}

	{{/* Get the HTTPS_METHOD defined by containers w/ the same vhost, falling back to "redirect" */}}
	{{ $https_method := or (first (groupByKeys $port_containers "Env.HTTPS_METHOD")) "redirect" }}

	{{/* Get the first cert name defined by containers w/ the same vhost */}}
	{{ $certName := first (groupByKeys $port_containers "Env.CERT_NAME") }}

	{{/* Get the best matching cert file by name for the vhost and remove all suffixes. */}}
	{{ $vhostCert := trimSuffix ".key" (trimSuffix ".crt" (closest (dir "/etc/nginx/certs") (printf "%s.crt" $host))) }}

	{{/* Use the cert specified on the container or fallback to the best vhost match */}}
	{{ $cert := coalesce $certName $vhostCert }}

	{{ $with_https := and (ne $https_method "nohttps") (ne $cert "") (exists (printf "/etc/nginx/certs/%s.crt" $cert)) (exists (printf "/etc/nginx/certs/%s.key" $cert)) }}

	{{ template "upstream" (dict "me" $me "host" $host "port" $port "path_container_map" $root_container_map) }}
	{{ template "upstream" (dict "me" $me "host" $host "port" $port "path_container_map" $path_container_map) }}

	{{ if $with_https }}
		server {
			{{ template "server_basic_settings" (dict "host" $host "port" $port "secure" true "default_server" $default_server) }}
			{{ template "server_ssl_settings" (dict "cert" $cert "strong_encryption" true) }}
			{{ template "server_settings" (dict "host" $host "port" $port) }}
			{{ template "server_locations" (dict "host" $host "port" $port "path_container_map" $root_container_map) }}
			{{ template "server_locations" (dict "host" $host "port" $port "path_container_map" $path_container_map) }}

			{{ if ne $https_method "noredirect" }}
				add_header Strict-Transport-Security "max-age=31536000";
			{{ end }}
		}
	{{ end }}

	{{ if or (not $with_https) (and $is_default_port (eq $https_method "noredirect")) }}
		server {
			{{ template "server_basic_settings" (dict "host" $host "port" $port "default_server" $default_server) }}
			{{ template "server_settings" (dict "host" $host "port" $port) }}
			{{ template "server_locations" (dict "host" $host "port" $port "path_container_map" $root_container_map) }}
			{{ template "server_locations" (dict "host" $host "port" $port "path_container_map" $path_container_map) }}
		}
	{{ else if and $with_https $is_default_port (eq $https_method "redirect") }}
		server {
			{{ template "server_basic_settings" (dict "host" $host "default_server" $default_server) }}
			return 301 https://$host$request_uri;
		}
	{{ end }}
{{ end }}


{{ define "server_basic_settings" }}
	{{ $port           := coalesce .port "default" }}
	{{ $is_https       := coalesce .secure (eq $port "443") }}
	{{ $default_server := coalesce .default_server "" }}

	server_name {{ .host }};
	{{ if $is_https }}
		listen {{ when (eq $port "default") "443" $port }} ssl http2 {{- $default_server }};
	{{ else }}
		listen {{ when (eq $port "default") "80" $port }} {{- $default_server }};
	{{ end }}

	access_log /var/log/nginx/access.log vhost;
{{ end }}


{{ define "server_ssl_settings" }}
	{{ if .strong_encryption }}
		ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
		ssl_ciphers 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS';

		ssl_prefer_server_ciphers on;

		ssl_session_timeout 5m;
		ssl_session_cache shared:SSL:50m;
	{{ end }}

	ssl_session_tickets off;

	ssl_certificate {{ printf "/etc/nginx/certs/%s.crt" .cert }};
	ssl_certificate_key {{ printf "/etc/nginx/certs/%s.key" .cert }};

	{{ if exists (printf "/etc/nginx/certs/%s.dhparam.pem" .cert) }}
		ssl_dhparam {{ printf "/etc/nginx/certs/%s.dhparam.pem" .cert }};
	{{ end }}
{{ end }}


{{ define "server_settings" }}
	{{ $host := .host }}
	{{ $port := .port }}

	{{ if exists (printf "/etc/nginx/vhost.d/%s_%s" $host $port) }}
		include {{ printf "/etc/nginx/vhost.d/%s_%s" $host $port }};
	{{ else if exists (printf "/etc/nginx/vhost.d/%s" $host) }}
		include {{ printf "/etc/nginx/vhost.d/%s" $host }};
	{{ else if exists "/etc/nginx/vhost.d/default" }}
		include /etc/nginx/vhost.d/default;
	{{ end }}
{{ end }}


{{ define "server_locations" }}
	{{ $host := .host }}
	{{ $port := .port }}
	{{ $path_container_map := .path_container_map }}

	{{ range $path, $path_containers := $path_container_map }}
		{{ $path := trimSuffix "/" $path }}
		{{ $slug := replace $path "/" "_" -1 }}

		{{ if gt (len $path_containers) 0 }}
			location {{ $path }}/ {
				{{/* Get the VIRTUAL_PROTO defined by containers w/ the same vhost, falling back to "http" */}}
				{{ $proto := or (first (groupByKeys $path_containers "Env.VIRTUAL_BACKEND_PROTO")) "http" }}

				{{ $upstream_name := printf "%s_%s%s" $host $port $slug }}

				{{ $path_pass_through := parseBool (or (first (groupByKeys $path_containers "Env.VIRTUAL_PATH_PASS_THROUGH")) "false") }}
				{{/* For an explanation of the optional slash, see http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_pass */}}
				{{ $backend_url := printf "%s://%s%s" $proto $upstream_name (when $path_pass_through "" "/") }}

				{{ if eq $proto "uwsgi" }}
					include uwsgi_params;
					uwsgi_pass {{ $backend_url }};
				{{ else }}
					proxy_pass {{ $backend_url }};
				{{ end }}

				{{ if exists (printf "/etc/nginx/basic_auth/%s_%s_%s/htpasswd" $host $port $slug) }}
					auth_basic "Restricted {{ $host }}";
					auth_basic_user_file {{ printf "/etc/nginx/basic_auth/%s_%s_%s/htpasswd" $host $port $slug }};
				{{ else if exists (printf "/etc/nginx/basic_auth/%s_%s/htpasswd" $host $port) }}
					auth_basic "Restricted {{ $host }}";
					auth_basic_user_file {{ printf "/etc/nginx/basic_auth/%s_%s/htpasswd" $host $port }};
				{{ else if exists (printf "/etc/nginx/basic_auth/%s/htpasswd" $host) }}
					auth_basic "Restricted {{ $host }}";
					auth_basic_user_file {{ printf "/etc/nginx/basic_auth/%s/htpasswd" $host }};
				{{ end }}

				{{ if exists (printf "/etc/nginx/vhost.d/%s_%s_%s_location" $host $port $slug) }}
					include {{ printf "/etc/nginx/vhost.d/%s_%s_%s_location" $host $port $slug }};
				{{ else if exists (printf "/etc/nginx/vhost.d/%s_%s_location" $host $port) }}
					include {{ printf "/etc/nginx/vhost.d/%s_%s_location" $host $port }};
				{{ else if exists (printf "/etc/nginx/vhost.d/%s_location" $host) }}
					include {{ printf "/etc/nginx/vhost.d/%s_location" $host }};
				{{ else if exists "/etc/nginx/vhost.d/default_location" }}
					include /etc/nginx/vhost.d/default_location;
				{{ end }}
			}
		{{ end }}
	{{ end }}
{{ end }}



{{ define "upstream_server" }}
	## Container connected via network "{{ .Network.Name }}"
	{{/* If we got the containers from swarm and this container's port is published to host, use host IP:PORT */}}
	{{ if and .Address .Container.Node.ID .Address.HostPort }}
		## {{ .Container.Node.Name }}/{{ .Container.Name }}
		server {{ .Container.Node.Address.IP }}:{{ .Address.HostPort }};
	{{/* If there is no swarm node or the port is not published on host, use container's IP:PORT */}}
	{{ else if and .Address .Network }}
		## {{ .Container.Name }}
		server {{ .Network.IP }}:{{ .Address.Port }};
	{{ else if .Network }}
		## {{ .Container.Name }}
		server {{ .Network.IP }} down;
	{{ end }}
{{ end }}


{{ define "upstream_switch" }}
	{{ if eq (len .Container.Addresses) 1 }}
		{{/* If only 1 port exposed, use that */}}
		{{ $address := index .Container.Addresses 0 }}
		{{ template "upstream_server" (dict "Container" .Container "Address" $address "Network" .Network) }}
	{{ else }}
		{{/* if more than one port exposed, use the one matching VIRTUAL_BACKEND_PORT env var, falling back to standard web port 80 */}}
		{{ $address := first (where .Container.Addresses "Port" (coalesce .Container.Env.VIRTUAL_BACKEND_PORT "80")) }}
		{{ template "upstream_server" (dict "Container" .Container "Address" $address "Network" .Network) }}
	{{ end }}
{{ end }}


{{ define "upstream" }}
	{{ $me   := .me }}
	{{ $host := .host }}
	{{ $port := .port }}
	{{ $path_container_map := .path_container_map}}

	{{ range $path, $path_containers := $path_container_map }}
		{{ if gt (len $path_containers) 0 }}
			{{ $upstream_name := printf "%s_%s%s" $host $port (trimSuffix "_" (replace $path "/" "_" -1)) }}
			upstream {{ $upstream_name }} {
				{{ range $container := $path_containers }}
					{{ range $knownNetwork := $me.Networks }}
						{{ range $containerNetwork := $container.Networks }}
							{{ if eq $knownNetwork.Name $containerNetwork.Name }}
								{{ template "upstream_switch" (dict "Container" $container "Network" $containerNetwork) }}
							{{ end }}
						{{ end }}
					{{ end }}
				{{ end }}
				{{/* This avoids invalid upstream configuration in case something breaks */}}
				server 127.0.0.1 down;
			}
		{{ end }}
	{{ end }}
{{ end }}







## If we receive X-Forwarded-Proto, pass it through; otherwise, pass along the scheme used to connect to this server
map $http_x_forwarded_proto $proxy_x_forwarded_proto {
	default $http_x_forwarded_proto;
	'' $scheme;
}

## If we receive X-Forwarded-Port, pass it through; otherwise, pass along the server port the client connected to
map $http_x_forwarded_port $proxy_x_forwarded_port {
	default $http_x_forwarded_port;
	''      $server_port;
}

## If we receive Upgrade, set Connection to "upgrade"; otherwise, delete any Connection header that may have been passed to this server
map $http_upgrade $proxy_connection {
	default upgrade;
	'' close;
}

## Set appropriate X-Forwarded-Ssl header
map $scheme $proxy_x_forwarded_ssl {
	default off;
	https on;
}


{{ if exists "/etc/nginx/proxy.conf" }}
	include /etc/nginx/proxy.conf;
{{ else }}
	## HTTP 1.1 support
	proxy_http_version 1.1;
	proxy_buffering off;
	proxy_set_header Host $http_host;
	proxy_set_header Upgrade $http_upgrade;
	proxy_set_header Connection $proxy_connection;
	proxy_set_header X-Real-IP $remote_addr;
	proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
	proxy_set_header X-Forwarded-Ssl $proxy_x_forwarded_ssl;
	proxy_set_header X-Forwarded-Proto $proxy_x_forwarded_proto;
	proxy_set_header X-Forwarded-Port $proxy_x_forwarded_port;

	## Mitigate httpoxy attack (see README for details)
	proxy_set_header Proxy "";
{{ end }}

gzip_types text/plain text/css application/javascript application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;

log_format vhost '$host $remote_addr - $remote_user [$time_local] "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent"';
access_log off;


{{ $me := where $ "ID" .Docker.CurrentContainerID | first }}


{{/* First host definitions will catch access to the IP or to invalid hostnames */}}
{{ template "http_default_host" (dict "host" "_" "error_code" 503) }}
{{ template "https_default_host" (dict "host" "_" "error_code" 503) }}


{{ range $host, $host_containers := groupByMulti $ "Env.VIRTUAL_HOST" "," }}

	{{ $def_port_container_map := dict "default" (whereNotExist $host_containers "Env.VIRTUAL_PORT") }}
	{{ $port_container_map     := groupBy $host_containers "Env.VIRTUAL_PORT" }}

	{{ range $port, $port_containers := $def_port_container_map }}
		{{ template "server" (dict "me" $me "host" $host "port" $port "port_containers" $port_containers )}}
	{{ end }}
	{{ range $port, $port_containers := $port_container_map }}
		{{ template "server" (dict "me" $me "host" $host "port" $port "port_containers" $port_containers )}}
	{{ end }}

{{ end }}