# Configuration Nginx avec SSL/TLS pour production
# À utiliser avec Let's Encrypt ou certificats auto-signés

# Redirection HTTP -> HTTPS
server {
    listen 80;
    listen [::]:80;
    server_name votre-domaine.com www.votre-domaine.com;
    
    # Redirection permanente vers HTTPS
    return 301 https://$server_name$request_uri;
}

# Configuration HTTPS principale
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name votre-domaine.com www.votre-domaine.com;

    # Certificats SSL - À remplacer par vos certificats Let's Encrypt
    ssl_certificate /etc/letsencrypt/live/votre-domaine.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/votre-domaine.com/privkey.pem;
    
    # Configuration SSL/TLS moderne et sécurisée
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384';
    ssl_prefer_server_ciphers off;
    
    # OCSP Stapling - Améliore la performance SSL
    ssl_stapling on;
    ssl_stapling_verify on;
    ssl_trusted_certificate /etc/letsencrypt/live/votre-domaine.com/chain.pem;
    
    # Session SSL
    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:50m;
    ssl_session_tickets off;
    
    # Paramètres Diffie-Hellman pour Perfect Forward Secrecy
    ssl_dhparam /etc/nginx/dhparam.pem;  # Générer avec: openssl dhparam -out /etc/nginx/dhparam.pem 4096

    # Headers de sécurité
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
    add_header X-Frame-Options "DENY" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; font-src 'self' data:; connect-src 'self'; frame-ancestors 'none';" always;
    add_header Permissions-Policy "geolocation=(), microphone=(), camera=(), payment=()" always;

    # Logs
    access_log /var/log/nginx/innotexboard-access.log;
    error_log /var/log/nginx/innotexboard-error.log;

    # Limite de taille des uploads
    client_max_body_size 100M;

    # Protection contre les slow attacks
    client_body_timeout 10s;
    client_header_timeout 10s;
    keepalive_timeout 65s;
    send_timeout 10s;

    # Frontend - Application Vue.js
    location / {
        proxy_pass http://frontend:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
        
        # Headers de sécurité pour proxy
        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
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
    }

    # Backend API
    location /api/ {
        proxy_pass http://backend:8000/api/;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
        
        # Headers de sécurité
        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;
        
        # Timeouts plus longs pour API
        proxy_connect_timeout 120s;
        proxy_send_timeout 120s;
        proxy_read_timeout 120s;
        
        # Buffering
        proxy_buffering on;
        proxy_buffer_size 4k;
        proxy_buffers 8 4k;
        
        # Rate limiting - 100 requêtes/seconde par IP
        limit_req zone=api_limit burst=20 nodelay;
    }

    # WebSocket pour temps réel
    location /api/v1/ws {
        proxy_pass http://backend:8000/api/v1/ws;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        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;
        
        # Timeouts longs pour WebSocket
        proxy_connect_timeout 7d;
        proxy_send_timeout 7d;
        proxy_read_timeout 7d;
    }

    # Bloquer l'accès aux fichiers sensibles
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }

    # Bloquer l'accès aux fichiers de sauvegarde
    location ~ ~$ {
        deny all;
        access_log off;
        log_not_found off;
    }
}

# Zone de rate limiting globale
limit_req_zone $binary_remote_addr zone=api_limit:10m rate=100r/s;

# Configuration du resolver DNS
resolver 8.8.8.8 8.8.4.4 valid=300s;
resolver_timeout 5s;