# ──────────────────────────────────────────────────────────────────
# PrutCMS v10 — nginx reverse proxy
#
# Place this in /etc/nginx/sites-available/prutcms and symlink to
# /etc/nginx/sites-enabled/. Replace <YOUR-DOMAIN> with the real host.
#
# Key points:
#   • SSL termination here; Node listens on 127.0.0.1:3000 only.
#   • WebSocket upgrade headers wired through (Prutter live messaging).
#   • Static assets cached aggressively (Node gives them 1y maxAge anyway).
#   • Audio streaming endpoint /audio/stream/* must NOT be cached by nginx —
#     each request carries a different signed token and is byte-range based.
#   • HSTS + security headers added at the proxy.
#
# After installing:
#   sudo ln -s /etc/nginx/sites-available/prutcms /etc/nginx/sites-enabled/
#   sudo nginx -t
#   sudo systemctl reload nginx
#
# Then provision SSL:
#   sudo certbot --nginx -d <YOUR-DOMAIN> -d www.<YOUR-DOMAIN>
# certbot will edit this file in place to insert the cert paths.
# ──────────────────────────────────────────────────────────────────

# WebSocket connection upgrade map (let nginx set it once globally)
map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
}

# Redirect HTTP → HTTPS
server {
    listen 80;
    listen [::]:80;
    server_name <YOUR-DOMAIN> www.<YOUR-DOMAIN>;

    # Let's Encrypt http-01 challenge path
    location /.well-known/acme-challenge/ {
        root /var/www/letsencrypt;
    }

    location / {
        return 301 https://$host$request_uri;
    }
}

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name <YOUR-DOMAIN> www.<YOUR-DOMAIN>;

    # certbot will fill these in:
    # ssl_certificate     /etc/letsencrypt/live/<YOUR-DOMAIN>/fullchain.pem;
    # ssl_certificate_key /etc/letsencrypt/live/<YOUR-DOMAIN>/privkey.pem;
    ssl_protocols       TLSv1.2 TLSv1.3;
    ssl_ciphers         ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305;
    ssl_prefer_server_ciphers off;
    ssl_session_cache   shared:SSL:10m;
    ssl_session_timeout 1d;
    ssl_stapling on;
    ssl_stapling_verify on;

    # Security headers (Helmet adds them at the app too — these are belt+braces)
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
    add_header X-Frame-Options          "SAMEORIGIN" always;
    add_header X-Content-Type-Options   "nosniff" always;
    add_header Referrer-Policy          "no-referrer-when-downgrade" always;

    # Reasonable body size — accommodates 50 MB MP3 uploads with headroom
    client_max_body_size 60M;

    # Compression
    gzip on;
    gzip_types text/plain text/css application/json application/javascript application/xml application/atom+xml application/rss+xml image/svg+xml;
    gzip_min_length 256;

    # ── Static assets: serve via Node, but tell upstream they're long-cached.
    location /assets/ {
        proxy_pass http://127.0.0.1:3000;
        proxy_set_header Host $host;
        proxy_cache_valid 200 1y;
        add_header Cache-Control "public, max-age=31536000, immutable";
    }

    # ── Audio streaming: pass through, no caching, no buffering (HTML5 <audio>
    #    needs to seek using byte-range; nginx must not slurp the whole file).
    location /audio/stream/ {
        proxy_pass http://127.0.0.1:3000;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_buffering off;
        proxy_request_buffering off;
        proxy_read_timeout 600s;
        add_header Cache-Control "private, no-store" always;
    }

    # ── WebSocket: Prutter live chat. Long-lived connection.
    location /ws/ {
        proxy_pass http://127.0.0.1:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_read_timeout 3600s;     # let pings keep it alive an hour
        proxy_send_timeout 3600s;
    }

    # ── Everything else: standard reverse proxy
    location / {
        proxy_pass http://127.0.0.1:3000;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Real-IP $remote_addr;

        # Upgrade headers in case any other route ever uses WS
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;

        proxy_read_timeout 90s;
    }
}