upstream crm {
    server 127.0.0.1:8000;
}

# Основной HTTPS сервер с улучшенной безопасностью
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name crm.mcmed.ru;

	root /opt/crm/frontend/build;

    # SSL конфигурация
    ssl_certificate /etc/letsencrypt/live/crm.mcmed.ru/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/crm.mcmed.ru/privkey.pem;
    ssl_trusted_certificate /etc/letsencrypt/live/crm.mcmed.ru/chain.pem;

    # Современные SSL настройки
    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:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384';
    ssl_prefer_server_ciphers on;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 10m;
    ssl_stapling on;
    ssl_stapling_verify on;

    # Security headers
    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 Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://fonts.googleapis.com https://www.googletagmanager.com https://www.google-analytics.com https://analytics.google.com https://cdnjs.cloudflare.com; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com https://fonts.gstatic.com; img-src 'self' data: blob: http://crm.mcmed.ru https://crm.mcmed.ru https://www.google-analytics.com https://analytics.google.com https://*; font-src 'self' https://fonts.gstatic.com data:; connect-src 'self' http://crm.mcmed.ru https://crm.mcmed.ru http://crm.mcmed.ru https://crm.mcmed.ru https://www.google-analytics.com https://analytics.google.com https://cdn.jsdelivr.net ws: wss:; frame-src 'self' https://www.googletagmanager.com; object-src 'none'; base-uri 'self'; form-action 'self'; worker-src 'self' blob: https://cdnjs.cloudflare.com;" always;
    add_header X-Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://fonts.googleapis.com https://www.googletagmanager.com https://www.google-analytics.com https://analytics.google.com https://cdnjs.cloudflare.com; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com https://fonts.gstatic.com; img-src 'self' data: blob: http://crm.mcmed.ru https://crm.mcmed.ru https://www.google-analytics.com https://analytics.google.com https://*; font-src 'self' https://fonts.gstatic.com data:; connect-src 'self' http://crm.mcmed.ru https://crm.mcmed.ru http://crm.mcmed.ru https://crm.mcmed.ru https://www.google-analytics.com https://analytics.google.com https://cdn.jsdelivr.net ws: wss:; frame-src 'self' https://www.googletagmanager.com; object-src 'none'; base-uri 'self'; form-action 'self'; worker-src 'self' blob: https://cdnjs.cloudflare.com;" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Permissions-Policy "geolocation=(), microphone=(), camera=(), payment=()" always;

    # Блокировка доступа к служебным файлам
    location ~ /(\.env|\.git|\.svn|\.htaccess|\.htpasswd|config|backup|dump|phpinfo|wp-config) {
        deny all;
        access_log off;
        log_not_found off;
    }

    # Блокировка доступа к robots.txt
    location = /robots.txt {
        deny all;
        access_log off;
        log_not_found off;
    }

    # Блокировка доступа к sitemap.xml
    location = /sitemap.xml {
        deny all;
        access_log off;
        log_not_found off;
    }

    # Защита от атак на API
    location /api/ {
        # Ограничение методов
        limit_except GET POST PUT PATCH DELETE OPTIONS {
            deny all;
        }

        # Rate limiting completely disabled - no limits on requests
        # limit_req zone=api_limit burst=100 nodelay;

        # Connection limiting completely disabled - no limits on connections
        # limit_conn conn_limit 50;

        # Large request body size allowed
        #client_max_body_size 50M;

        # Generous timeout for slow clients
        #client_body_timeout 30s;

        # Проксирование на бэкенд
        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_http_version 1.1;
        proxy_set_header        Upgrade $http_upgrade;
        proxy_set_header        Connection "upgrade";
        proxy_buffering off;
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
        proxy_pass http://crm;
    }

    # Основная конфигурация фронтенда
    location / {
        try_files $uri $uri/ /index.html;

        # Кэширование статических файлов
        location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
            expires 1y;
            add_header Cache-Control "public, immutable";
            access_log off;
        }
    }

    # Блокировка доступа к favicon.ico
    location = /favicon.ico {
        return 404;
    }

    # Защита от атак на сервер
    server_tokens off;
    add_header X-Powered-By "CRM Security Server" always;

    # Логирование
    access_log /var/log/nginx/crm.access.log;
    error_log /var/log/nginx/crm.error.log;

    # Ограничение размера тела запроса
    client_max_body_size 2000M;

    # Connection limiting completely disabled - no limits on connections
    # limit_conn conn_limit 50;
}

# Сервер для Let's Encrypt ACME challenges
server {
    listen 80;
    listen [::]:80;
    server_name crm.mcmed.ru;
    root /var/www/certbot;

    location ^~ /.well-known/acme-challenge/ {
        # Используем root без изменений
        try_files $uri =404;

        # Отключаем логи для этих запросов
        access_log off;
        log_not_found off;
    }

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