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

{{ define "upstream" }}
        {{ if .Address }}
                {{/* If we got the containers from swarm and this container's port is published to host, use host IP:PORT */}}
                {{ if and .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 .Network }}
                        # {{ .Container.Name }}
                        server {{ .Network.IP }}:{{ .Address.Port }};
                {{ end }}
        {{ else if .Network }}
                # {{ .Container.Name }}
                {{ if .Network.IP }}
                        server {{ .Network.IP }} down;
                {{ else }}
                        server 127.0.0.1 down;
                {{ end }}
        {{ end }}

{{ end }}

{{ define "ssl_policy" }}
        {{ if eq .ssl_policy "Mozilla-Modern" }}
                ssl_protocols TLSv1.3;
                {{/* nginx currently lacks ability to choose ciphers in TLS 1.3 in configuration, see https://trac.nginx.org/nginx/ticket/1529 /*}}
                {{/* a possible workaround can be modify /etc/ssl/openssl.cnf to change it globally (see https://trac.nginx.org/nginx/ticket/1529#comment:12 ) /*}}
                {{/* explicitly set ngnix default value in order to allow single servers to override the global http value */}}
                ssl_ciphers HIGH:!aNULL:!MD5;
                ssl_prefer_server_ciphers off;
        {{ else if eq .ssl_policy "Mozilla-Intermediate" }}
                ssl_protocols TLSv1.2 TLSv1.3;
                ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384';
                ssl_prefer_server_ciphers off;
        {{ else if eq .ssl_policy "Mozilla-Old" }}
                ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
                ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA256:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA';
                ssl_prefer_server_ciphers on;
        {{ else if eq .ssl_policy "AWS-TLS-1-2-2017-01" }}
                ssl_protocols TLSv1.2 TLSv1.3;
                ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:AES128-GCM-SHA256:AES128-SHA256:AES256-GCM-SHA384:AES256-SHA256';
                ssl_prefer_server_ciphers on;
        {{ else if eq .ssl_policy "AWS-TLS-1-1-2017-01" }}
                ssl_protocols TLSv1.1 TLSv1.2 TLSv1.3;
                ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:AES128-GCM-SHA256:AES128-SHA256:AES128-SHA:AES256-GCM-SHA384:AES256-SHA256:AES256-SHA';
                ssl_prefer_server_ciphers on;
        {{ else if eq .ssl_policy "AWS-2016-08" }}
                ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
                ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:AES128-GCM-SHA256:AES128-SHA256:AES128-SHA:AES256-GCM-SHA384:AES256-SHA256:AES256-SHA';
                ssl_prefer_server_ciphers on;
        {{ else if eq .ssl_policy "AWS-2015-05" }}
                ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
                ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:AES128-GCM-SHA256:AES128-SHA256:AES128-SHA:AES256-GCM-SHA384:AES256-SHA256:AES256-SHA:DES-CBC3-SHA';
                ssl_prefer_server_ciphers on;
        {{ else if eq .ssl_policy "AWS-2015-03" }}
                ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
                ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:AES128-GCM-SHA256:AES128-SHA256:AES128-SHA:AES256-GCM-SHA384:AES256-SHA256:AES256-SHA:DHE-DSS-AES128-SHA:DES-CBC3-SHA';
                ssl_prefer_server_ciphers on;
        {{ else if eq .ssl_policy "AWS-2015-02" }}
                ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
                ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:AES128-GCM-SHA256:AES128-SHA256:AES128-SHA:AES256-GCM-SHA384:AES256-SHA256:AES256-SHA:DHE-DSS-AES128-SHA';
                ssl_prefer_server_ciphers on;
        {{ 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;
}

# Apply fix for very long server names
server_names_hash_bucket_size 128;

# Default dhparam
{{ if (exists "/etc/nginx/dhparam/dhparam.pem") }}
ssl_dhparam /etc/nginx/dhparam/dhparam.pem;
{{ end }}

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

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;

{{/* Get the SSL_POLICY defined by this container, falling back to "Mozilla-Intermediate" */}}
{{ $ssl_policy := or ($.Env.SSL_POLICY) "Mozilla-Intermediate" }}
{{ template "ssl_policy" (dict "ssl_policy" $ssl_policy) }}

{{ if $.Env.RESOLVERS }}
resolver {{ $.Env.RESOLVERS }};
{{ end }}

{{ 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;
proxy_set_header X-Forwarded-Ssl $proxy_x_forwarded_ssl;
proxy_set_header X-Forwarded-Port $proxy_x_forwarded_port;

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

{{ $enable_ipv6 := eq (or ($.Env.ENABLE_IPV6) "") "true" }}
server {
        server_name _; # This is just an invalid value which will never trigger on a real hostname.
        listen 80;
        {{ if $enable_ipv6 }}
        listen [::]:80;
        {{ end }}
        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;
        {{ if $enable_ipv6 }}
        listen [::]:443 ssl http2;
        {{ end }}
        access_log /var/log/nginx/access.log vhost;
        return 503;

        ssl_session_cache shared:SSL:50m;
        ssl_session_tickets off;
        ssl_certificate /etc/nginx/certs/default.crt;
        ssl_certificate_key /etc/nginx/certs/default.key;
}
{{ end }}

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

{{ $host := trim $host }}
{{ $is_regexp := hasPrefix "~" $host }}
{{ $upstream_name := when $is_regexp (sha1 $host) $host }}

# {{ $host }}
upstream {{ $upstream_name }} {

{{ range $container := $containers }}
        {{ $addrLen := len $container.Addresses }}

        {{ range $knownNetwork := $CurrentContainer.Networks }}
                {{ range $containerNetwork := $container.Networks }}
                        {{ if (and (ne $containerNetwork.Name "ingress") (or (eq $knownNetwork.Name $containerNetwork.Name) (eq $knownNetwork.Name "host"))) }}
                                ## Can be connected with "{{ $containerNetwork.Name }}" network

                                {{/* If only 1 port exposed, use that */}}
                                {{ if eq $addrLen 1 }}
                                        {{ $address := index $container.Addresses 0 }}
                                        {{ template "upstream" (dict "Container" $container "Address" $address "Network" $containerNetwork) }}
                                {{/* If more than one port exposed, use the one matching VIRTUAL_PORT env var, falling back to standard web port 80 */}}
                                {{ else }}
                                        {{ $port := coalesce $container.Env.VIRTUAL_PORT "80" }}
                                        {{ $address := where $container.Addresses "Port" $port | first }}
                                        {{ template "upstream" (dict "Container" $container "Address" $address "Network" $containerNetwork) }}
                                {{ end }}
                        {{ else }}
                                # Cannot connect to network of this container
                                server 127.0.0.1 down;
                        {{ end }}
                {{ end }}
        {{ end }}
{{ end }}
}

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

{{/* Get the VIRTUAL_PROTO defined by containers w/ the same vhost, falling back to "http" */}}
{{ $proto := trim (or (first (groupByKeys $containers "Env.VIRTUAL_PROTO")) "http") }}

{{/* Get the NETWORK_ACCESS defined by containers w/ the same vhost, falling back to "external" */}}
{{ $network_tag := or (first (groupByKeys $containers "Env.NETWORK_ACCESS")) "external" }}

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

{{/* Get the SSL_POLICY defined by containers w/ the same vhost, falling back to empty string (use default) */}}
{{ $ssl_policy := or (first (groupByKeys $containers "Env.SSL_POLICY")) "" }}

{{/* Get the HSTS defined by containers w/ the same vhost, falling back to "max-age=31536000" */}}
{{ $hsts := or (first (groupByKeys $containers "Env.HSTS")) "max-age=31536000" }}

{{/* Get the VIRTUAL_ROOT By containers w/ use fastcgi root */}}
{{ $vhost_root := or (first (groupByKeys $containers "Env.VIRTUAL_ROOT")) "/var/www/public" }}


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

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

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

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

{{ $is_https := (and (ne $https_method "nohttps") (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 }};
        {{ if $enable_ipv6 }}
        listen [::]:80 {{ $default_server }};
        {{ end }}
        access_log /var/log/nginx/access.log vhost;
        return 301 https://$host$request_uri;
}
{{ end }}

server {
        server_name {{ $host }};
        listen 443 ssl http2 {{ $default_server }};
        {{ if $enable_ipv6 }}
        listen [::]:443 ssl http2 {{ $default_server }};
        {{ end }}
        access_log /var/log/nginx/access.log vhost;

        {{ if eq $network_tag "internal" }}
        # Only allow traffic from internal clients
        include /etc/nginx/network_internal.conf;
        {{ end }}

        {{ template "ssl_policy" (dict "ssl_policy" $ssl_policy) }}

        ssl_session_timeout 5m;
        ssl_session_cache shared:SSL:50m;
        ssl_session_tickets off;

        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 (exists (printf "/etc/nginx/certs/%s.chain.pem" $cert)) }}
        ssl_stapling on;
        ssl_stapling_verify on;
        ssl_trusted_certificate {{ printf "/etc/nginx/certs/%s.chain.pem" $cert }};
        {{ end }}

        {{ if (not (or (eq $https_method "noredirect") (eq $hsts "off"))) }}
        add_header Strict-Transport-Security "{{ trim $hsts }}" always;
        {{ 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 / {
                {{ if eq $proto "uwsgi" }}
                include uwsgi_params;
                uwsgi_pass {{ trim $proto }}://{{ trim $upstream_name }};
                {{ else if eq $proto "fastcgi" }}
                root   {{ trim $vhost_root }};
                include fastcgi_params;
                fastcgi_pass {{ trim $upstream_name }};
                {{ else }}
                proxy_pass {{ trim $proto }}://{{ trim $upstream_name }};
                {{ end }}

                {{ 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 }};
        {{ if $enable_ipv6 }}
        listen [::]:80 {{ $default_server }};
        {{ end }}
        access_log /var/log/nginx/access.log vhost;

        {{ if eq $network_tag "internal" }}
        # Only allow traffic from internal clients
        include /etc/nginx/network_internal.conf;
        {{ 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 / {
                {{ if eq $proto "uwsgi" }}
                include uwsgi_params;
                uwsgi_pass {{ trim $proto }}://{{ trim $upstream_name }};
                {{ else if eq $proto "fastcgi" }}
                root   {{ trim $vhost_root }};
                include fastcgi_params;
                fastcgi_pass {{ trim $upstream_name }};
                {{ else }}
                proxy_pass {{ trim $proto }}://{{ trim $upstream_name }};
                {{ end }}
                {{ 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 }};
        {{ if $enable_ipv6 }}
        listen [::]:443 ssl http2 {{ $default_server }};
        {{ end }}
        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 }}