# Nginx Configuration for Indo Advisory
# VPS Deployment with Apache Integration
# Location: /etc/nginx/sites-available/indo-advisory

server {
    listen 80;
    server_name indoadvisory.com www.indoadvisory.com your-domain.com;
    
    # Security Headers
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "no-referrer-when-downgrade" always;
    add_header Content-Security-Policy "default-src 'self' http: https: data: blob: 'unsafe-inline'" always;
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    
    # Hide Nginx version
    server_tokens off;
    
    # Request size limits
    client_max_body_size 10M;
    
    # Gzip Compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_proxied expired no-cache no-store private must-revalidate auth;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/json
        application/javascript
        application/xml+rss
        application/atom+xml
        image/svg+xml;
    
    # Rate Limiting
    limit_req_zone $binary_remote_addr zone=login:10m rate=5r/m;
    limit_req_zone $binary_remote_addr zone=api:10m rate=100r/m;
    limit_req_zone $binary_remote_addr zone=general:10m rate=200r/m;
    
    # Static Files (served directly by Nginx for better performance)
    location /static/ {
        alias /var/www/indo-advisory/public/;
        expires 7d;
        add_header Cache-Control "public, no-transform";
        
        # Security for static files
        location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
            expires 30d;
            add_header Cache-Control "public, immutable";
        }
    }
    
    # Uploads (with authentication check via Node.js)
    location /uploads/ {
        proxy_pass http://127.0.0.1:3000;
        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;
        
        # Upload size limit
        client_max_body_size 10M;
    }
    
    # API Routes (with rate limiting)
    location /api/ {
        limit_req zone=api burst=20 nodelay;
        
        proxy_pass http://127.0.0.1:3000;
        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_cache_bypass $http_upgrade;
        
        # Timeouts
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
    }
    
    # Admin Routes (with stricter rate limiting)
    location /admin {
        limit_req zone=login burst=10 nodelay;
        
        proxy_pass http://127.0.0.1:3000;
        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_cache_bypass $http_upgrade;
        
        # Additional security for admin
        deny 192.168.1.1; # Example: block specific IPs
        # allow 192.168.1.0/24; # Example: allow only office network
        # deny all;
    }
    
    # Authentication Routes (with rate limiting)
    location /auth/ {
        limit_req zone=login burst=5 nodelay;
        
        proxy_pass http://127.0.0.1:3000;
        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;
        
        # Fail2ban integration
        access_log /var/log/nginx/auth.log combined;
    }
    
    # Main Application
    location / {
        limit_req zone=general burst=50 nodelay;
        
        proxy_pass http://127.0.0.1:3000;
        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_cache_bypass $http_upgrade;
        
        # Timeouts
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
    }
    
    # Block access to sensitive files
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }
    
    location ~ \.(env|config|sql|log)$ {
        deny all;
        access_log off;
        log_not_found off;
    }
    
    # Block common exploit attempts
    location ~ /(wp-admin|wp-content|wp-includes|phpmyadmin|admin|administrator) {
        return 444; # Close connection without response
    }
    
    # Logging
    access_log /var/log/nginx/indo-advisory.access.log combined;
    error_log /var/log/nginx/indo-advisory.error.log warn;
}

# SSL Configuration (for HTTPS)
# Uncomment and configure after obtaining SSL certificate
# server {
#     listen 443 ssl http2;
#     server_name indoadvisory.com www.indoadvisory.com;
#     
#     # SSL Certificate (Let's Encrypt recommended)
#     ssl_certificate /etc/letsencrypt/live/indoadvisory.com/fullchain.pem;
#     ssl_certificate_key /etc/letsencrypt/live/indoadvisory.com/privkey.pem;
#     
#     # SSL Settings
#     ssl_protocols TLSv1.2 TLSv1.3;
#     ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384;
#     ssl_prefer_server_ciphers off;
#     ssl_session_cache shared:SSL:10m;
#     ssl_session_timeout 10m;
#     
#     # HSTS
#     add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
#     
#     # Include all location blocks from above...
# }

# Redirect HTTP to HTTPS (enable after SSL setup)
# server {
#     listen 80;
#     server_name indoadvisory.com www.indoadvisory.com;
#     return 301 https://$server_name$request_uri;
# }