limit_req_zone $binary_remote_addr zone=vacationplanner_ip_rate:1m rate=6r/m;
limit_req_zone $server_name zone=vacationplanner_total_rate:1m rate=2r/s;
limit_conn_zone $binary_remote_addr zone=vacationplanner_ip_conn:1m;
limit_conn_zone $server_name zone=vacationplanner_total_conn:1m;

map $status $vacationplanner_retry_after {
    default "";
    429 60;
}

map $status $vacationplanner_allow {
    default "";
    405 "GET, HEAD";
}

server {
    listen 80;
    listen [::]:80;
    server_name vacationplanner.popov.link;

    access_log off;
    error_log /dev/null;
    add_header Referrer-Policy "no-referrer" always;

    return 301 https://vacationplanner.popov.link$request_uri;
}

server {
    listen 443 ssl;
    listen [::]:443 ssl;
    server_name vacationplanner.popov.link;

    ssl_certificate /etc/letsencrypt/live/popov.link/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/popov.link/privkey.pem;
    ssl_trusted_certificate /etc/letsencrypt/live/popov.link/chain.pem;

    root /var/www/vacationplanner;
    access_log off;
    error_log /dev/null;

    # Defining a header here replaces the inherited add_header directives.
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "no-referrer" always;
    add_header Permissions-Policy "geolocation=(), microphone=(), camera=()" always;
    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
    add_header Retry-After $vacationplanner_retry_after always;
    add_header Allow $vacationplanner_allow always;

    if ($request_method !~ ^(GET|HEAD)$) {
        return 405;
    }

    location = /calendar.ics {
        limit_req zone=vacationplanner_ip_rate burst=4 nodelay;
        limit_req zone=vacationplanner_total_rate burst=16 nodelay;
        limit_req_status 429;
        limit_conn vacationplanner_ip_conn 4;
        limit_conn vacationplanner_total_conn 16;
        limit_conn_status 429;

        proxy_pass http://127.0.0.1:8080;
        proxy_http_version 1.1;
        proxy_set_header Connection "";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_pass_request_body off;
        proxy_set_header Content-Length "";
        proxy_hide_header Referrer-Policy;
        proxy_hide_header X-Content-Type-Options;
        proxy_read_timeout 65s;
        proxy_buffering off;
        proxy_cache off;
        proxy_max_temp_file_size 0;
        proxy_intercept_errors off;
    }

    location / {
        try_files /index.html =404;
    }
}