# ospab.host Nginx Configuration
# Production configuration for React SPA + Express Backend

# Upstream для бэкенда
upstream backend_api {
    server 127.0.0.1:5000;
    keepalive 32;
}

# Rate limiting zones
limit_req_zone $binary_remote_addr zone=api_limit:10m rate=10r/s;
limit_req_zone $binary_remote_addr zone=login_limit:10m rate=5r/m;

# Redirect HTTP to HTTPS
server {
    listen 80;
    listen [::]:80;
    server_name ospab.host www.ospab.host;
    
    # Let's Encrypt challenge
    location /.well-known/acme-challenge/ {
        root /var/www/certbot;
    }
    
    location / {
        return 301 https://$host$request_uri;
    }
}

# Main HTTPS server
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name ospab.host www.ospab.host;
    
    # SSL Configuration
    ssl_certificate /etc/apache2/ssl/ospab.host.fullchain.crt;
    ssl_certificate_key /etc/apache2/ssl/ospab.host.key;
    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:50m;
    ssl_session_tickets off;
    
    # Modern SSL configuration
    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;
    
    # HSTS
    add_header Strict-Transport-Security "max-age=63072000" always;
    
    # OCSP Stapling
    ssl_stapling on;
    ssl_stapling_verify on;
    resolver 8.8.8.8 8.8.4.4 valid=300s;
    resolver_timeout 5s;
    
    # Root directory for frontend build
    root /var/www/ospab-host/frontend/dist;
    index index.html;
    
    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types text/plain text/css text/xml application/json application/javascript application/xml application/rss+xml image/svg+xml;
    
    # Security headers
    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 "strict-origin-when-cross-origin" always;
    add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;
    
    # API proxy to backend
    location /api/ {
        limit_req zone=api_limit burst=20 nodelay;
        
        proxy_pass https://backend_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_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_cache_bypass $http_upgrade;
        proxy_read_timeout 60s;
        proxy_connect_timeout 60s;
        
        # Error handling - redirect to custom error page
        proxy_intercept_errors on;
        error_page 502 503 504 = @error_page;
    }
    
    # Auth endpoints - stricter rate limiting
    location /api/auth/login {
        limit_req zone=login_limit burst=5 nodelay;
        
        proxy_pass https://backend_api;
        proxy_http_version 1.1;
        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_intercept_errors on;
        error_page 502 503 504 = @error_page;
    }
    
    location /api/auth/register {
        limit_req zone=login_limit burst=3 nodelay;
        
        proxy_pass https://backend_api;
        proxy_http_version 1.1;
        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_intercept_errors on;
        error_page 502 503 504 = @error_page;
    }
    
    # WebSocket support for real-time features
    location /ws {
        proxy_pass https://backend_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_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_read_timeout 86400;
    }
    
    # Uploaded files (checks images)
    location /uploads/ {
        alias /var/www/ospab-host/backend/uploads/;
        expires 30d;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }
    
    # Static assets with long cache
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }
    
    # Manifest and service worker
    location ~* \.(webmanifest|manifest\.json)$ {
        expires 1d;
        add_header Cache-Control "public";
        types {
            application/manifest+json webmanifest;
        }
    }
    
    # Health check endpoint
    location /health {
        access_log off;
        return 200 "OK";
        add_header Content-Type text/plain;
    }
    
    # Robots.txt
    location = /robots.txt {
        access_log off;
        try_files $uri =404;
    }
    
    # Sitemap
    location = /sitemap.xml {
        access_log off;
        try_files $uri =404;
    }
    
    # Custom error page handler
    location @error_page {
        internal;
        rewrite ^ /error?code=$upstream_status redirect;
    }
    
    # Error pages
    error_page 404 /index.html;
    error_page 500 502 503 504 /error?code=$status;
    
    # SPA fallback - all other routes go to index.html
    location / {
        try_files $uri $uri/ /index.html;
    }
    
    # Block common attacks
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }
    
    location ~* /(\.git|\.env|\.htaccess|\.htpasswd|node_modules)/ {
        deny all;
        return 404;
    }
    
    # Block sensitive files
    location ~* \.(sql|bak|backup|log|ini|conf)$ {
        deny all;
        return 404;
    }
    
    # Access and error logs
    access_log /var/log/nginx/ospab.host.access.log;
    error_log /var/log/nginx/ospab.host.error.log;
}

# Redirect www to non-www
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name www.ospab.host;
    
    ssl_certificate /etc/apache2/ssl/ospab.host.fullchain.crt;
    ssl_certificate_key /etc/apache2/ssl/ospab.host.key;
    
    return 301 https://ospab.host$request_uri;
}

# API server
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name api.ospab.host;
    
    # SSL Configuration
    ssl_certificate /etc/letsencrypt/live/api.ospab.host/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/api.ospab.host/privkey.pem;
    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:50m;
    ssl_session_tickets off;
    
    # Modern SSL configuration
    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;
    
    # HSTS
    add_header Strict-Transport-Security "max-age=63072000" always;
    
    # OCSP Stapling
    ssl_stapling on;
    ssl_stapling_verify on;
    resolver 8.8.8.8 8.8.4.4 valid=300s;
    resolver_timeout 5s;
    
    # Proxy to backend
    location / {
        proxy_pass https://backend_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_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_cache_bypass $http_upgrade;
        proxy_read_timeout 60s;
        proxy_connect_timeout 60s;
    }
}