daemon off;

worker_processes 2;
pid /run/nginx.pid;

worker_rlimit_nofile 523264;
events {
    multi_accept        on;
    worker_connections  16384;
    use                 epoll; 
}

http {
    real_ip_header      X-Forwarded-For;
    set_real_ip_from    0.0.0.0/0;
    real_ip_recursive   on;

    geoip_country       /etc/nginx/GeoIP.dat;
    geoip_city          /etc/nginx/GeoLiteCity.dat;
    geoip_proxy_recursive on;

    vhost_traffic_status_zone shared:vhost_traffic_status:10m;
    vhost_traffic_status_filter_by_set_key $geoip_country_code country::*;

    # lua section to return proper error codes when custom pages are used
    lua_package_path '.?.lua;./etc/nginx/lua/?.lua;/etc/nginx/lua/vendor/lua-resty-http/lib/?.lua;';
    init_by_lua_block {
        require("error_page")
    }

    sendfile            on;
    aio                 threads;
    tcp_nopush          on;
    tcp_nodelay         on;
    log_subrequest      on;

    reset_timedout_connection on;

    keepalive_timeout 75s;

    client_header_buffer_size       1k;
    large_client_header_buffers     4 8k;

    types_hash_max_size             2048;
    server_names_hash_max_size      512;
    server_names_hash_bucket_size   64;
    map_hash_bucket_size            64;

    include /etc/nginx/mime.types;
    default_type text/html;
    gzip on;
    gzip_comp_level 5;
    gzip_http_version 1.1;
    gzip_min_length 256;
    gzip_types application/atom+xml application/javascript application/x-javascript application/json application/rss+xml application/vnd.ms-fontobject application/x-font-ttf application/x-web-app-manifest+json application/xhtml+xml application/xml font/opentype image/svg+xml image/x-icon text/css text/plain text/x-component;    
    gzip_proxied any;

    server_tokens on;   

    log_format upstreaminfo '$remote_addr - '
        '[$proxy_add_x_forwarded_for] - $remote_user [$time_local] "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent" '
        '$request_length $request_time [$proxy_upstream_name] $upstream_addr $upstream_response_length $upstream_response_time $upstream_status';

    map $request_uri $loggable {
        default 1;
    }

    access_log /var/log/nginx/access.log upstreaminfo if=$loggable;
    error_log  /var/log/nginx/error.log notice;

    resolver 192.168.0.2 valid=30s;

    # Retain the default nginx handling of requests without a "Connection" header
    map $http_upgrade $connection_upgrade {
        default          upgrade;
        ''               close;
    }

    # trust http_x_forwarded_proto headers correctly indicate ssl offloading
    map $http_x_forwarded_proto $pass_access_scheme {
        default          $http_x_forwarded_proto;
        ''               $scheme;
    }

    map $http_x_forwarded_port $pass_server_port {
       default           $http_x_forwarded_port;
       ''                $server_port;
    }

    # map port 442 to 443 for header X-Forwarded-Port
    map $pass_server_port $pass_port {
        442              443;
        default          $pass_server_port;
    }

    # Map a response error watching the header Content-Type
    map $http_accept $httpAccept {
        default          html;
        application/json json;
        application/xml  xml;
        text/plain       text;
    }

    map $httpAccept $httpReturnType {
        default          text/html;
        json             application/json;
        xml              application/xml;
        text             text/plain;
    }

    server_name_in_redirect off;
    port_in_redirect        off;

    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;

    # turn on session caching to drastically improve performance
    ssl_session_cache builtin:1000 shared:SSL:10m;
    ssl_session_timeout 10m;

    # allow configuring ssl session tickets
    ssl_session_tickets on;

    # slightly reduce the time-to-first-byte
    ssl_buffer_size 4k;

    # allow configuring custom ssl ciphers
    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;

    # In case of errors try the next upstream server before returning an error
    proxy_next_upstream                     error timeout invalid_header http_502 http_503 http_504;

    upstream default-kube-state-metrics-8080 {
        least_conn;
        server 172.16.39.4:8080 max_fails=0 fail_timeout=0;
    }
    upstream upstream-default-backend {
        least_conn;
        server 172.16.34.5:8080 max_fails=0 fail_timeout=0;
    }
    server {
        server_name _;
        listen [::]:80 ipv6only=off default_server reuseport backlog=511;
        listen 442  default_server reuseport backlog=511 ssl http2;
        # PEM sha: d6d43c441973c52ceecaf13c1c6f083275339cc4
        ssl_certificate                         /ingress-controller/ssl/system-snake-oil-certificate.pem;
        ssl_certificate_key                     /ingress-controller/ssl/system-snake-oil-certificate.pem;

        more_set_headers                        "Strict-Transport-Security: max-age=15724800; includeSubDomains; preload";

        vhost_traffic_status_filter_by_set_key $geoip_country_code country::$server_name;

        location / {
            set $proxy_upstream_name "upstream-default-backend";

            port_in_redirect off;
            client_max_body_size                    "1m";

            proxy_set_header Host                   $host;

            # Pass Real IP
            proxy_set_header X-Real-IP              $remote_addr;

            # Allow websocket connections
            proxy_set_header                        Upgrade           $http_upgrade;
            proxy_set_header                        Connection        $connection_upgrade;

            proxy_set_header X-Forwarded-For        $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Host       $host;
            proxy_set_header X-Forwarded-Port       $pass_port;
            proxy_set_header X-Forwarded-Proto      $pass_access_scheme;

            # mitigate HTTPoxy Vulnerability
            # https://www.nginx.com/blog/mitigating-the-httpoxy-vulnerability-with-nginx/
            proxy_set_header Proxy                  "";

            # Custom headers

            proxy_connect_timeout                   5s;
            proxy_send_timeout                      60s;
            proxy_read_timeout                      60s;

            proxy_redirect                          off;
            proxy_buffering                         off;
            proxy_buffer_size                       "4k";

            proxy_http_version                      1.1;
            proxy_pass http://upstream-default-backend;
        }
        # health checks in cloud providers require the use of port 80
        location /healthz {
            access_log off;
            return 200;
        }

        # this is required to avoid error if nginx is being monitored
        # with an external software (like sysdig)
        location /nginx_status {
            allow 127.0.0.1;
            allow ::1;
            deny all;

            access_log off;
            stub_status on;
        }
    }
	
    server {
        server_name foo.com;
        listen [::]:80;
        vhost_traffic_status_filter_by_set_key $geoip_country_code country::$server_name;

        location / {
            set $proxy_upstream_name "default-kube-state-metrics-8080";

            port_in_redirect off;
            client_max_body_size                    "1m";

            proxy_set_header Host                   $host;

            # Pass Real IP
            proxy_set_header X-Real-IP              $remote_addr;

            # Allow websocket connections
            proxy_set_header                        Upgrade           $http_upgrade;
            proxy_set_header                        Connection        $connection_upgrade;

            proxy_set_header X-Forwarded-For        $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Host       $host;
            proxy_set_header X-Forwarded-Port       $pass_port;
            proxy_set_header X-Forwarded-Proto      $pass_access_scheme;

            # mitigate HTTPoxy Vulnerability
            # https://www.nginx.com/blog/mitigating-the-httpoxy-vulnerability-with-nginx/
            proxy_set_header Proxy                  "";

            # Custom headers

            proxy_connect_timeout                   5s;
            proxy_send_timeout                      60s;
            proxy_read_timeout                      60s;

            proxy_redirect                          off;
            proxy_buffering                         off;
            proxy_buffer_size                       "4k";

            proxy_http_version                      1.1;
            proxy_pass http://default-kube-state-metrics-8080;
        }
    }
	
    # default server, used for NGINX healthcheck and access to nginx stats
    server {
        # Use the port 18080 (random value just to avoid known ports) as default port for nginx.
        # Changing this value requires a change in:
        # https://github.com/kubernetes/contrib/blob/master/ingress/controllers/nginx/nginx/command.go#L104
        listen [::]:18080 ipv6only=off default_server reuseport backlog=511;

        location /healthz {
            access_log off;
            return 200;
        }
        location /nginx_status {
            vhost_traffic_status_display;
            vhost_traffic_status_display_format html;
        }

        # this location is used to extract nginx metrics
        # using prometheus.
        # TODO: enable extraction for vts module.
        location /internal_nginx_status {
            allow 127.0.0.1;
            allow ::1;
            deny all;

            access_log off;
            stub_status on;
        }

        location / {
            set $proxy_upstream_name "upstream-default-backend";
            proxy_pass             http://upstream-default-backend;
        }

    }

    # default server for services without endpoints
    server {
        listen 8181;
        set $proxy_upstream_name "-";

        location / {
            return 503;
        }
    }
}

stream {
    # map FQDN that requires SSL passthrough
    map $ssl_preread_server_name $stream_upstream {
        # send SSL traffic to this nginx in a different port 
        default                         nginx-ssl-backend;
    }

    log_format log_stream '$remote_addr [$time_local] $protocol [$ssl_preread_server_name] [$stream_upstream] $status $bytes_sent $bytes_received $session_time';

    access_log /var/log/nginx/access.log log_stream;

    error_log  /var/log/nginx/error.log;

    # configure default backend for SSL
    upstream nginx-ssl-backend {
        server 127.0.0.1:442;
    }
    server {
        listen                  [::]:443 ipv6only=off;
        proxy_pass              $stream_upstream;
        ssl_preread             on;
    }

    # TCP services		

    # UDP services		
}