# Nginx Reverse Proxy Konfiguration für n8n mit LibreBooking
# Beispielkonfiguration für HTTPS Zugang
#
# Verwendung:
# 1. Diese Datei nach /etc/nginx/sites-available/n8n kopieren
# 2. ln -s /etc/nginx/sites-available/n8n /etc/nginx/sites-enabled/
# 3. SSL-Zertifikate einrichten (z.B. mit Certbot)
# 4. nginx -t && systemctl reload nginx

# Upstream für n8n
upstream n8n_backend {
    server 127.0.0.1:5678;
    keepalive 32;
}

# HTTP -> HTTPS Redirect
server {
    listen 80;
    listen [::]:80;
    server_name n8n.example.com;
    
    # ACME Challenge für Let's Encrypt
    location /.well-known/acme-challenge/ {
        root /var/www/certbot;
    }
    
    location / {
        return 301 https://$host$request_uri;
    }
}

# HTTPS Server
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name n8n.example.com;
    
    # SSL-Zertifikate (Let's Encrypt Beispiel)
    ssl_certificate /etc/letsencrypt/live/n8n.example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/n8n.example.com/privkey.pem;
    
    # SSL-Einstellungen (moderne Konfiguration)
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_prefer_server_ciphers off;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384;
    
    # HSTS
    add_header Strict-Transport-Security "max-age=63072000" always;
    
    # Logging
    access_log /var/log/nginx/n8n_access.log;
    error_log /var/log/nginx/n8n_error.log;
    
    # Proxy-Einstellungen
    location / {
        proxy_pass http://n8n_backend;
        proxy_http_version 1.1;
        
        # WebSocket Support (wichtig für n8n Editor)
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        
        # Standard Proxy Headers
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Host $host;
        proxy_set_header X-Forwarded-Port $server_port;
        
        # Timeouts (erhöht für lange Workflow-Ausführungen)
        proxy_connect_timeout 60s;
        proxy_send_timeout 300s;
        proxy_read_timeout 300s;
        
        # Buffer-Einstellungen
        proxy_buffering off;
        proxy_buffer_size 4k;
        
        # Client-Upload Limit (anpassen nach Bedarf)
        client_max_body_size 50M;
    }
    
    # Webhook-spezifische Einstellungen
    location /webhook/ {
        proxy_pass http://n8n_backend;
        proxy_http_version 1.1;
        
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        
        # Erhöhte Timeouts für Webhooks
        proxy_connect_timeout 60s;
        proxy_send_timeout 600s;
        proxy_read_timeout 600s;
        
        proxy_buffering off;
        client_max_body_size 100M;
    }
    
    # Health Check Endpoint
    location /healthz {
        proxy_pass http://n8n_backend/healthz;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        access_log off;
    }
}

# Optional: Monitoring/Metrics Server Block
# server {
#     listen 127.0.0.1:9090;
#     server_name localhost;
#     
#     location /nginx_status {
#         stub_status on;
#         allow 127.0.0.1;
#         deny all;
#     }
# }