upstream backend-server {
	server ${BACKEND} fail_timeout=0;
}

upstream socketio-server {
	server ${SOCKETIO} fail_timeout=0;
}

# Parse the X-Forwarded-Proto header - if set - defaulting to $scheme.
map $http_x_forwarded_proto $proxy_x_forwarded_proto {
	default $scheme;
	https https;
}

server {
	listen 8080;
	server_name $http_host;
	root /usr/share/nginx/html;

	proxy_buffer_size 128k;
	proxy_buffers 4 256k;
	proxy_busy_buffers_size 256k;

	add_header X-Frame-Options "SAMEORIGIN";
	add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload";
	add_header X-Content-Type-Options nosniff;
	add_header X-XSS-Protection "1; mode=block";
	add_header Referrer-Policy "same-origin, strict-origin-when-cross-origin";

	set_real_ip_from ${UPSTREAM_REAL_IP_ADDRESS};
	real_ip_header ${UPSTREAM_REAL_IP_HEADER};
	real_ip_recursive ${UPSTREAM_REAL_IP_RECURSIVE};

	location /assets {
		try_files $uri =404;
	}

	location ~ ^/protected/(.*) {
		internal;
		try_files /sites/$http_host/$1 =404;
	}

	location /socket.io {
		proxy_http_version 1.1;
		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
		proxy_set_header X-Forwarded-Proto $proxy_x_forwarded_proto;
		proxy_set_header Upgrade $http_upgrade;
		proxy_set_header Connection "upgrade";
		proxy_set_header X-Frappe-Site-Name ${FRAPPE_SITE_NAME_HEADER};
		proxy_set_header Origin $scheme://$http_host;
		proxy_set_header Host $host;

		proxy_pass http://socketio-server;
	}

	location / {
		rewrite ^(.+)/$ $proxy_x_forwarded_proto://$http_host$1 permanent;
		rewrite ^(.+)/index\.html$ $proxy_x_forwarded_proto://$http_host$1 permanent;
		rewrite ^(.+)\.html$ $proxy_x_forwarded_proto://$http_host$1 permanent;

		location ~ ^/files/.*.(htm|html|svg|xml) {
			add_header Content-disposition "attachment";
			try_files /sites/${FRAPPE_SITE_NAME_HEADER}/public/$uri @webserver;
		}

		try_files /sites/${FRAPPE_SITE_NAME_HEADER}/public/$uri @webserver;
	}

	location @webserver {
		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-Frappe-Site-Name ${FRAPPE_SITE_NAME_HEADER};
		proxy_set_header Host $host;
		proxy_set_header X-Use-X-Accel-Redirect True;
		proxy_read_timeout 120;
		proxy_redirect off;

		proxy_pass  http://backend-server;
	}

	# error pages
	error_page 502 /502.html;
	location /502.html {
		internal;
	}

	# optimizations
	sendfile on;
	keepalive_timeout 15;
	client_max_body_size 50m;
	client_body_buffer_size 16K;
	client_header_buffer_size 1k;

	# enable gzip compression
	# based on https://mattstauffer.co/blog/enabling-gzip-on-nginx-servers-including-laravel-forge
	gzip on;
	gzip_http_version 1.1;
	gzip_comp_level 5;
	gzip_min_length 256;
	gzip_proxied any;
	gzip_vary on;
	gzip_types
		application/atom+xml
		application/javascript
		application/json
		application/rss+xml
		application/vnd.ms-fontobject
		application/x-font-ttf
		application/font-woff
		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;
		# text/html is always compressed by HttpGzipModule
}