# AITBC Nginx Reverse Proxy Configuration
# Domain: aitbc.keisanki.net
# This configuration replaces the need for firehol/iptables port forwarding

# HTTP to HTTPS redirect
server {
    listen 80;
    server_name aitbc.keisanki.net;
    
    # Redirect all HTTP traffic to HTTPS
    return 301 https://$server_name$request_uri;
}

# Main HTTPS server block
server {
    listen 443 ssl http2;
    server_name aitbc.keisanki.net;
    
    # SSL Configuration (Let's Encrypt certificates)
    ssl_certificate /etc/letsencrypt/live/aitbc.keisanki.net/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/aitbc.keisanki.net/privkey.pem;
    include /etc/letsencrypt/options-ssl-nginx.conf;
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
    
    # 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 "strict-origin-when-cross-origin" always;
    add_header Content-Security-Policy "default-src 'self' http: https: data: blob: 'unsafe-inline' 'unsafe-eval'" always;
    
    # Enable gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types text/plain text/css text/xml text/javascript application/javascript application/xml+rss application/json;
    
    # Blockchain Explorer (main route)
    location / {
        proxy_pass http://192.168.100.10:3000;
        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;
        proxy_buffering off;
        
        # WebSocket support if needed
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }
    
    # Coordinator API
    location /api/ {
        proxy_pass http://192.168.100.10:8000/v1/;
        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_buffering off;
        
        # CORS headers for API
        add_header Access-Control-Allow-Origin "*" always;
        add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS" always;
        add_header Access-Control-Allow-Headers "DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization,X-Api-Key" always;
        
        # Handle preflight requests
        if ($request_method = 'OPTIONS') {
            add_header Access-Control-Allow-Origin "*";
            add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS";
            add_header Access-Control-Allow-Headers "DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization,X-Api-Key";
            add_header Access-Control-Max-Age 1728000;
            add_header Content-Type "text/plain; charset=utf-8";
            add_header Content-Length 0;
            return 204;
        }
    }
    
    # Blockchain Node 1 RPC
    location /rpc/ {
        proxy_pass http://192.168.100.10:8082/rpc/;
        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_buffering off;
    }
    
    # Blockchain Node 2 RPC (alternative endpoint)
    location /rpc2/ {
        proxy_pass http://192.168.100.10:8081/rpc/;
        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_buffering off;
    }
    
    # Exchange API
    location /exchange/ {
        proxy_pass http://192.168.100.10:9080/;
        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_buffering off;
    }
    
    # Marketplace UI (if separate from explorer)
    location /marketplace/ {
        proxy_pass http://192.168.100.10:3001/;
        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_buffering off;
        
        # Handle subdirectory rewrite
        rewrite ^/marketplace/(.*)$ /$1 break;
    }
    
    # Admin dashboard
    location /admin/ {
        proxy_pass http://192.168.100.10:8080/;
        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_buffering off;
        
        # Optional: Restrict admin access
        # allow 192.168.100.0/24;
        # allow 127.0.0.1;
        # deny all;
    }
    
    # Health check endpoint
    location /health {
        access_log off;
        return 200 "healthy\n";
        add_header Content-Type text/plain;
    }
    
    # API health checks
    location /api/health {
        proxy_pass http://192.168.100.10:8000/v1/health;
        proxy_set_header Host $host;
        access_log off;
    }
    
    # Static assets caching
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        proxy_pass http://192.168.100.10:3000;
        expires 1y;
        add_header Cache-Control "public, immutable";
        add_header X-Content-Type-Options nosniff;
        
        # Don't log static file access
        access_log off;
    }
    
    # Deny access to hidden files
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }
    
    # Custom error pages
    error_page 404 /404.html;
    error_page 500 502 503 504 /50x.html;
    
    location = /50x.html {
        root /usr/share/nginx/html;
    }
}

# Optional: Subdomain for API-only access
server {
    listen 443 ssl http2;
    server_name api.aitbc.keisanki.net;
    
    # SSL Configuration (same certificates)
    ssl_certificate /etc/letsencrypt/live/aitbc.keisanki.net/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/aitbc.keisanki.net/privkey.pem;
    include /etc/letsencrypt/options-ssl-nginx.conf;
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
    
    # Security headers
    add_header X-Frame-Options "DENY" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    
    # API routes only
    location / {
        proxy_pass http://192.168.100.10:8000/v1/;
        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_buffering off;
        
        # CORS headers
        add_header Access-Control-Allow-Origin "*" always;
        add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS" always;
        add_header Access-Control-Allow-Headers "DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization,X-Api-Key" always;
        
        # Handle preflight requests
        if ($request_method = 'OPTIONS') {
            add_header Access-Control-Allow-Origin "*";
            add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS";
            add_header Access-Control-Allow-Headers "DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization,X-Api-Key";
            add_header Access-Control-Max-Age 1728000;
            add_header Content-Type "text/plain; charset=utf-8";
            add_header Content-Length 0;
            return 204;
        }
    }
}

# Optional: Subdomain for blockchain RPC
server {
    listen 443 ssl http2;
    server_name rpc.aitbc.keisanki.net;
    
    # SSL Configuration
    ssl_certificate /etc/letsencrypt/live/aitbc.keisanki.net/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/aitbc.keisanki.net/privkey.pem;
    include /etc/letsencrypt/options-ssl-nginx.conf;
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
    
    # Security headers
    add_header X-Frame-Options "DENY" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header X-Content-Type-Options "nosniff" always;
    
    # RPC routes
    location / {
        proxy_pass http://192.168.100.10:8082/rpc/;
        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_buffering off;
    }
}