sites.tmpl

{{ define "upstream" }}
	server {{ .Address }}:{{ .Port }};
{{ 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 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;
}

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;

{{ 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-Proto $proxy_x_forwarded_proto;

# Mitigate httpoxy attack
proxy_set_header Proxy "";
{{ end }}

server {
	server_name _; # This is just an invalid value which will never trigger on a real hostname.
	listen 80;
	access_log /var/log/nginx/access.log vhost;
	return 503;
}

{{ 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;
	access_log /var/log/nginx/access.log vhost;
	return 503;

	ssl_certificate /etc/nginx/certs/default.crt;
	ssl_certificate_key /etc/nginx/certs/default.key;
}
{{ end -}}

{{- $readyPods := readyPods .Pods }}
{{ $all := whereExist (combine $readyPods .Services) "ObjectMeta.Annotations.proxy_host" -}}
{{- range $host, $resources := groupByMulti $all "ObjectMeta.Annotations.proxy_host" "," -}}

upstream {{ $host }} {
{{- range $resource := $resources -}}
	{{ if hasField $resource ".Spec.ClusterIP" -}}
		{{/* Resource is a Service -*/}}
		{{ $addr := $resource.Spec.ClusterIP -}}
		{{ if len .Spec.Ports | eq 1 -}}
			{{/* if only 1 port is exposed, use that -*/}}
			{{ $portSpec := index $resource.Spec.Ports 0 -}}
			{{ $port := $portSpec.Port -}}
			{{- template "upstream" (dict "Address" $addr "Port" $port) -}}
		{{ else }}
			{{/* use the proxy_port annotation, falling back to port 80 */}}
			{{ $port := coalesce $resource.ObjectMeta.Annotations.proxy_port "80" -}}
			{{ template "upstream" (dict "Address" $addr "Port" $port) -}}
		{{ end -}}
	{{ else if and (hasField $resource ".Status.PodIP") (isPodReady $resource) }}
		{{/* Pod */}}
		{{ $addr := $resource.Status.PodIP -}}
		{{ if and (len .Spec.Containers | eq 1) (len (first .Spec.Containers).Ports | eq 1) }}
			{{/* if the service has a single container exposing a single port, use it */}}
			{{ $port := (($resource.Spec.Containers | first).Ports | first).ContainerPort -}}
			{{ template "upstream" (dict "Address" $addr "Port" $port) -}}
		{{ else }}
			{{ $port := coalesce $resource.ObjectMeta.Annotations.proxy_port "80" }}
			{{ template "upstream" (dict "Address" $addr "Port" $port) -}}
		{{ end -}}
	{{ end -}}
{{ end -}}
}

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

{{/* Get the proxy_proto defined by pods/services w/ the same vhost, falling back to "http" */}}
{{ $proto := or (groupByKeys $resources "ObjectMeta.Annotations.proxy_proto" | first) "http" -}}

{{/* Get the https_method defined by pods/services w/ the same vhost, falling back to "redirect" */}}
{{ $https_method := or (groupByKeys $resources "ObjectMeta.Annotations.proxy_https_method" | first) "redirect" -}}

{{/* Get the first cert name defined by containers w/ the same vhost */}}
{{ $certName := (groupByKeys $resources "ObjectMeta.Annotations.proxy_ssl_cert_name" | first) -}}

{{/* Get the best matching cert  by name for the vhost. */}}
{{ $vhostCert := "" -}}

{{/* vhostCert is actually a filename so remove any suffixes since they are added later */}}
{{ $vhostCert := replace $vhostCert ".crt" "" -1 -}}
{{ $vhostCert := replace $vhostCert ".key" "" -1 -}}

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

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

{{- if $is_https -}}

{{- if eq $https_method "redirect" -}}
server {
	server_name {{ $host }};
	listen 80 {{ $default_server }};
	access_log /var/log/nginx/access.log vhost;
	return 301 https://$host$request_uri;
}
{{ end -}}

server {
	server_name {{ $host }};
	listen 443 ssl http2 {{ $default_server }};
	access_log /var/log/nginx/access.log vhost;

	ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
	ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA;

	ssl_prefer_server_ciphers on;
	ssl_session_timeout 5m;
	ssl_session_cache shared:SSL:50m;

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

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

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

	{{ 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 -}}

	location / {
		proxy_pass {{ trim $proto }}://{{ trim $host }};
		{{ if (exists (printf "/etc/nginx/htpasswd/%s" $host)) -}}
		auth_basic	"Restricted {{ $host }}";
		auth_basic_user_file	{{ (printf "/etc/nginx/htpasswd/%s" $host) }};
		{{ end -}}
		{{ 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 -}}

{{- if or (not $is_https) (eq $https_method "noredirect") -}}

server {
	server_name {{ $host }};
	listen 80 {{ $default_server }};
	access_log /var/log/nginx/access.log vhost;

	{{ 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 -}}

	location / {
		proxy_pass {{ trim $proto }}://{{ trim $host }};
		{{ if (exists (printf "/etc/nginx/htpasswd/%s" $host)) -}}
		auth_basic	"Restricted {{ $host }}";
		auth_basic_user_file	{{ (printf "/etc/nginx/htpasswd/%s" $host) }};
		{{ end -}}
		{{ 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 }}
	}
}

{{ 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 }};
	access_log /var/log/nginx/access.log vhost;
	return 500;

	ssl_certificate /etc/nginx/certs/default.crt;
	ssl_certificate_key /etc/nginx/certs/default.key;
}
{{ end -}}
{{ end -}}
{{ end -}}