# OIDC Identity Provider - Nginx Configuration Snippet
# Add this to your existing Nginx configuration

# Upstream definition
upstream oidc_backend {
    server 127.0.0.1:5000;
    keepalive 32;
}

# Rate limiting zones (add to http block)
limit_req_zone $binary_remote_addr zone=oidc_login_limit:10m rate=10r/m;
limit_req_zone $binary_remote_addr zone=oidc_general_limit:10m rate=100r/m;

# Server block for OIDC (HTTPS)
# Option 1: Dedicated subdomain
server {
    listen 443 ssl http2;
    server_name auth.yourdomain.com;  # Change to your domain

    # Your existing SSL configuration
    # ssl_certificate /path/to/your/fullchain.pem;
    # ssl_certificate_key /path/to/your/privkey.pem;

    # Security headers
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    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;

    # Logging
    access_log /var/log/nginx/oidc_access.log;
    error_log /var/log/nginx/oidc_error.log;

    # Max upload size
    client_max_body_size 10M;

    # Proxy settings
    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_http_version 1.1;
    proxy_set_header Connection "";
    proxy_redirect off;

    # Health check endpoint (no rate limit)
    location /health {
        proxy_pass http://oidc_backend;
    }

    # Login endpoints with strict rate limiting
    location ~ ^/(login|admin/login|authorize|token)$ {
        limit_req zone=oidc_login_limit burst=5 nodelay;
        proxy_pass http://oidc_backend;
    }

    # All other locations
    location / {
        limit_req zone=oidc_general_limit burst=20 nodelay;
        proxy_pass http://oidc_backend;
    }
}

# HTTP to HTTPS redirect
server {
    listen 80;
    server_name auth.yourdomain.com;  # Change to your domain
    return 301 https://$host$request_uri;
}

# -----------------------------------------------------------
# Option 2: Path-based (if you prefer /auth/* instead of subdomain)
# -----------------------------------------------------------
# Add this to your existing server block instead:
#
# location /auth/ {
#     # Rewrite to remove /auth prefix
#     rewrite ^/auth/(.*) /$1 break;
#
#     proxy_pass http://oidc_backend;
#     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_redirect off;
# }
#
# Note: If using path-based, set OIDC_ISSUER=https://yourdomain.com/auth