#Nginx + Gunicorn/Uvicorn：生产环境下的高性能反向代理配置

# /etc/nginx/conf.d/daoman.conf

upstream daoman_api {
    server 127.0.0.1:8000;
    keepalive 32;
}

server {
    listen 80;
    server_name daomanpy.com www.daomanpy.com;

    # HTTP 自动跳转 HTTPS
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl http2;
    server_name daomanpy.com www.daomanpy.com;

    # SSL 证书（Let's Encrypt 自动续期）
    ssl_certificate /etc/nginx/ssl/fullchain.pem;
    ssl_certificate_key /etc/nginx/ssl/privkey.pem;
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256;
    ssl_prefer_server_ciphers off;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 1d;

    # 安全头
    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" always;

    # Gzip 压缩
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_proxied any;
    gzip_types text/plain text/css application/json application/javascript
               application/xml application/xml+rss text/javascript;

    # 限流（防止 DDoS）
    limit_req_zone $binary_remote_addr zone=api_limit:10m rate=10r/s;
    limit_conn_zone $binary_remote_addr zone=addr:10m;

    # 主 API 代理
    location /api/ {
        limit_req zone=api_limit burst=20 nodelay;
        limit_conn addr 10;

        proxy_pass http://daoman_api;
        proxy_http_version 1.1;
        proxy_set_header Connection "";
        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_connect_timeout 60s;
        proxy_read_timeout 60s;
        proxy_send_timeout 60s;

        client_max_body_size 10M;
    }

    # 静态文件（直接由 Nginx 提供）
    location /static/ {
        alias /var/www/static/;
        expires 30d;
        add_header Cache-Control "public, immutable";
    }

    # WebSocket（长连接）
    location /ws/ {
        proxy_pass http://daoman_api;
        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_read_timeout 86400;
    }

    # 健康检查（Nginx 直接响应，不用经过 Python）
    location /health_nginx {
        access_log off;
        return 200 "healthy\n";
        add_header Content-Type text/plain;
    }

    # 文档
    location /docs {
        proxy_pass http://daoman_api;
        proxy_http_version 1.1;
        proxy_set_header Connection "";
    }

    location /openapi.json {
        proxy_pass http://daoman_api;
        proxy_http_version 1.1;
        proxy_set_header Connection "";
    }
}