# ==============================================================================
# ARQUIVO: /etc/nginx/sites-available/anatram.com.br.conf
# AUTOR:   Gemini (Especialista NGINX)
# DATA:    27/09/2025 - 17:09
# VERSÃO:  2.0 (Padronização, Hardening de Segurança e Rate Limiting)
#
# DESCRIÇÃO:
# Configuração de Proxy Reverso para o site anatram.com.br.
# Esta versão implementa as políticas globais de segurança e logging, corrige
# uma vulnerabilidade na verificação do SSL do backend e adiciona rate limiting.
# ==============================================================================

# ==============================================================================
# BLOCO 1: Redirecionamento de HTTP (porta 80) para HTTPS
# ==============================================================================
server {
    listen 80;
    listen [::]:80;
    server_name anatram.com.br;

    location /.well-known/acme-challenge/ {
        root /var/www/html;
    }

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

# ==============================================================================
# BLOCO 2: Servidor Principal - Proxy Reverso (HTTPS)
# ==============================================================================
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name anatram.com.br;

    # --- Logs ---
    access_log /var/log/nginx/anatram.com.br.access.log detailed_proxy;
    access_log /var/log/nginx/anatram.com.br.bad-bot.log suspicious_bot if=$block_request;
    error_log /var/log/nginx/anatram.com.br.error.log warn;

    # --- Segurança (Integração com nginx.conf) ---
    if ($block_request) {
        return 444; # Fecha a conexão sem resposta, eficaz contra bots.
    }

    # Aplica rate limiting global e um limite mais estrito para bots.
    limit_req zone=global_limit burst=20 nodelay;
    limit_req zone=bad_bot_limit;

    # --- Configurações de SSL/TLS (Padronizadas) ---
    ssl_certificate /etc/letsencrypt/live/anatram.com.br/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/anatram.com.br/privkey.pem;
    ssl_trusted_certificate /etc/letsencrypt/live/anatram.com.br/fullchain.pem; # Padronizado
    ssl_dhparam /etc/nginx/dhparam.pem;
    ssl_session_timeout 1d;
    ssl_session_tickets off;
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_prefer_server_ciphers off; # Padronizado
    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_stapling on;
    ssl_stapling_verify on;

    # --- Cabeçalhos de Segurança ---
    add_header Strict-Transport-Security "max-age=63072000; 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;
    add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;
    # ATENÇÃO: Esta CSP é muito restritiva. Se o site usar recursos externos (CDNs, Google Fonts, etc.), eles precisarão ser adicionados aqui.
    add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self'; img-src 'self'; font-src 'self'; connect-src 'self'; object-src 'none'; frame-ancestors 'self';" always;
    
    # --- Configurações de Compressão (Brotli & Gzip) ---
    brotli on;
    brotli_comp_level 6;
    brotli_types text/plain text/css application/json application/javascript application/x-javascript text/xml application/xml application/xml+rss image/svg+xml;
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types text/plain text/css application/json application/javascript application/x-javascript text/xml application/xml application/xml+rss image/svg+xml;
    gzip_disable "MSIE [1-6]\.";

    # --- Parâmetros de Proxy (Com Hardening) ---
    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;
    proxy_connect_timeout 60s;
    proxy_send_timeout 60s;
    proxy_read_timeout 60s;

    # --- Estratégia de Cache ---
    proxy_cache static_cache;
    add_header X-Proxy-Cache $upstream_cache_status;

    # --- REGRAS DE ROTEAMENTO (LOCATIONS) ---
    location ~* \.(?:css|js|mjs|svg|gif|png|jpg|jpeg|ico|wasm|woff2?|ttf|eot)$ {
        proxy_pass https://172.16.12.9:443;
        proxy_cache_valid 200 30d;
        proxy_cache_valid any 1m;
        expires 30d;
        add_header Cache-Control "public";
        access_log off;
    }

    location / {
        proxy_pass https://172.16.12.9:443;
        proxy_no_cache 1;
        proxy_cache_bypass 1;
    }
}