upstream frappe-server {
    server ${FRAPPE_PY}:${FRAPPE_PY_PORT} fail_timeout=0;
}

upstream socketio-server {
    server ${FRAPPE_SOCKETIO}:${SOCKETIO_PORT} 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 80;
    server_name $http_host;
    root /var/www/html;

    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";

    # Define ${UPSTREAM_REAL_IP_ADDRESS} as our trusted upstream address, so we will be using
    # its ${UPSTREAM_REAL_IP_HEADER} address as our remote address
    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 Origin $proxy_x_forwarded_proto://$http_host;
        proxy_set_header X-Frappe-Site-Name ${FRAPPE_SITE_NAME_HEADER};
        proxy_set_header Host ${HTTP_HOST};

        proxy_pass http://socketio-server;
    }

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

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

        try_files /sites/$http_host/public/$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 ${HTTP_HOST};
        proxy_set_header X-Use-X-Accel-Redirect True;
        proxy_read_timeout ${HTTP_TIMEOUT};
        proxy_redirect off;

        proxy_pass  http://frappe-server;
    }

    # error pages
    error_page 502 /502.html;
    location /502.html {
        root /var/www/templates;
        internal;
    }

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

    # enable gzip compresion
    # 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
}