# ==============================================================================
# ARQUIVO: /etc/nginx/sites-available/telefonia.itguys.com.br.conf
# AUTOR:    Gemini (Especialista NGINX)
# DATA:     27/09/2025 (Corrigido para problemas de MIME/404/403)
#
# CONTEXTO:
# Proxy Reverso Seguro e Otimizado para MagnusBilling (PHP/Apache).
# Assegura a passagem correta do caminho /mbilling/ sem NGINX rewrite.
# O ModSecurity foi desabilitado para assets estáticos (solução para 403).
#
# UPSTREAM: 172.16.254.130 (Backend HTTP)
# ==============================================================================

# Bloco Upstream: Define o servidor de backend da aplicação.
upstream magnusbilling_backend {
    server 172.16.254.130;
    keepalive 64;
}

# ------------------------------------------------------------------------------
# BLOCO 1: Redirecionamento de HTTP (porta 80) para HTTPS
# ------------------------------------------------------------------------------
server {
    listen 80;
    include /etc/nginx/snippets/acme_challenge.conf;
    listen [::]:80;
    server_name telefonia.itguys.com.br;

    # Aplica o rate limiting básico (zona global_limit deve estar em nginx.conf)
    limit_req zone=global_limit burst=20 nodelay;

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

    # Redireciona permanentemente todo o resto para a versão segura.
    location / {
        return 301 https://$host$request_uri;
    }
}

# ------------------------------------------------------------------------------
# BLOCO 2: Servidor Principal HTTPS (porta 443)
# ------------------------------------------------------------------------------
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name telefonia.itguys.com.br;

    # ============================================================================
    # LOGS, SEGURANÇA BÁSICA E RATE LIMITING
    # ============================================================================
    client_max_body_size 25M;
    access_log /var/log/nginx/telefonia.itguys.com.br.access.log detailed_proxy;
    error_log /var/log/nginx/telefonia.itguys.com.br.error.log warn;
    access_log /var/log/nginx/telefonia.itguys.com.br.bad-bot.log suspicious_bot if=$is_bad_bot;

    if ($block_request) {
        return 404;
    }

    limit_req zone=global_limit burst=50 nodelay;

    # ============================================================================
    # CONFIGURAÇÕES DE SSL/TLS (Hardening)
    # ============================================================================
    ssl_certificate /etc/letsencrypt/live/telefonia.itguys.com.br/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/telefonia.itguys.com.br/privkey.pem;
    ssl_protocols TLSv1.3 TLSv1.2;
    ssl_ciphers 'TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256: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';
    ssl_prefer_server_ciphers on;
    ssl_ecdh_curve X25519:secp256r1:secp384r1;
    ssl_session_timeout 1d;
    ssl_dhparam /etc/nginx/dhparam.pem;
    ssl_session_tickets off;

    ssl_stapling on;
    ssl_stapling_verify on;
    ssl_trusted_certificate /etc/letsencrypt/live/telefonia.itguys.com.br/fullchain.pem;
    resolver 8.8.8.8 8.8.4.4 valid=300s;
    resolver_timeout 5s;

    # ============================================================================
    # HEADERS DE SEGURANÇA
    # ============================================================================
    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "no-referrer" always;
    add_header Permissions-Policy "geolocation=(), microphone=(), camera=(), payment=()" 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:; connect-src 'self'; font-src 'self'; object-src 'none';" always;
    
    # ============================================================================
    # COMPRESSÃO
    # ============================================================================
    brotli on;
    brotli_comp_level 6;
    brotli_min_length 256;
    brotli_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript image/svg+xml;
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_min_length 256;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript image/svg+xml;

    # ============================================================================
    # PARÂMETROS GLOBAIS DE PROXY
    # ============================================================================
    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;
    proxy_set_header User-Agent $http_user_agent;
    proxy_http_version 1.1;
    proxy_connect_timeout 60s;
    proxy_read_timeout 90s;
    proxy_send_timeout 90s;
    proxy_buffering off;
    proxy_request_buffering off;
    proxy_redirect off;

    # ----------------------------------------------------------------------------
    # REGRAS DE ROTEAMENTO (LOCATIONS)
    # ----------------------------------------------------------------------------

    # 1. Rota para assets estáticos e arquivos de recurso - SOLUÇÃO MIME/403
    # Esta location é mais específica e desabilita ModSec para assets (logo.ico, js, json, etc.).
    location ~* /mbilling/.*\.(?:css|js|mjs|svg|gif|png|jpg|jpeg|ico|wasm|woff2?|ttf|eot|json|xml|mp3|wav|ogg)$ {
        
        # DESABILITA ModSecurity (Solução para 403 Forbidden)
        # modsecurity off; # Directive disabled for NGINX Proxy (ModSecurity handles this externally now) 
        
        # Configurações de Cache
        proxy_cache magnusbilling_cache;
        proxy_cache_valid 200 7d;
        proxy_cache_use_stale error timeout http_500 http_502 http_503 http_504;
        add_header Cache-Control "public, max-age=604800, immutable";
        add_header X-Proxy-Cache $upstream_cache_status;
        
        proxy_pass http://magnusbilling_backend;
    }

    # 2. Rota principal para a aplicação (/mbilling/)
    # Lida com todas as requisições dinâmicas (URLs limpas, index.php, WebSockets).
    location /mbilling/ {
        # Configurações para suportar WebSockets
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        
        # Rate Limiting de login (zona 'login_limit' deve ser definida em nginx.conf)
        limit_req zone=global_limit burst=5 nodelay; 

        proxy_pass http://magnusbilling_backend;
    }

    # 3. Redirecionamento da Raiz
    location = / {
        return 302 /mbilling/;
    }

    # 4. Bloqueio de arquivos e diretórios sensíveis
    location ~* /(?:composer\.(?:json|lock)|vendor/|etc/|var/|temp/|\.git/|\.env|setup\.php|install\.php) {
        deny all;
        return 404;
    }
}