# Nginx 反向代理配置範例 (含 SSL)
# 放置位置：/etc/nginx/sites-available/codimd

# HTTP - 自動重定向到 HTTPS
server {
    listen 80;
    listen [::]:80;
    server_name your-domain.com;

    # Let's Encrypt 驗證目錄
    location /.well-known/acme-challenge/ {
        root /var/www/certbot;
    }

    # 其他 HTTP 流量重定向到 HTTPS
    location / {
        return 301 https://$server_name$request_uri;
    }
}

# HTTPS - 主要服務
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name your-domain.com;

    # SSL 證書配置 (Let's Encrypt)
    ssl_certificate /etc/letsencrypt/live/your-domain.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/your-domain.com/privkey.pem;

    # SSL 安全配置
    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;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 10m;
    ssl_session_tickets off;

    # HSTS (HTTP Strict Transport Security)
    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;

    # 其他安全標頭
    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 Referrer-Policy "no-referrer-when-downgrade" always;

    # 用戶端上傳大小限制
    client_max_body_size 50M;

    # 反向代理到 CodiMD
    location / {
        proxy_pass http://127.0.0.1:3000;
        proxy_http_version 1.1;

        # WebSocket 支援 (CodiMD 即時協作需要)
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";

        # 標準代理標頭
        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;

        # 超時設定
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;

        # 緩衝設定
        proxy_buffering off;
        proxy_request_buffering off;
    }

    # 健康檢查端點 (可選)
    location /health {
        access_log off;
        proxy_pass http://127.0.0.1:3000;
    }
}