import { SERVICE_LOCAL_HOST } from './tools';

export const isInternalAddress = (url: string): boolean => {
  try {
    const parsedUrl = new URL(url);
    const hostname = parsedUrl.hostname;
    const fullUrl = parsedUrl.toString();

    // Check for localhost and common internal domains
    if (hostname === SERVICE_LOCAL_HOST) {
      return true;
    }

    // Metadata endpoints whitelist
    const metadataEndpoints = [
      // AWS
      'http://169.254.169.254/latest/meta-data/',
      // Azure
      'http://169.254.169.254/metadata/instance?api-version=2021-02-01',
      // GCP
      'http://metadata.google.internal/computeMetadata/v1/',
      // Alibaba Cloud
      'http://100.100.100.200/latest/meta-data/',
      // Tencent Cloud
      'http://metadata.tencentyun.com/latest/meta-data/',
      // Huawei Cloud
      'http://169.254.169.254/latest/meta-data/'
    ];
    if (metadataEndpoints.some((endpoint) => fullUrl.startsWith(endpoint))) {
      return true;
    }

    if (process.env.CHECK_INTERNAL_IP !== 'true') return false;

    // For IP addresses, check if they are internal
    const ipv4Pattern = /^(\d{1,3}\.){3}\d{1,3}$/;
    if (!ipv4Pattern.test(hostname)) {
      return false; // Not an IP address, so it's a domain name - consider it external by default
    }

    // ... existing IP validation code ...
    const parts = hostname.split('.').map(Number);

    if (parts.length !== 4 || parts.some((part) => part < 0 || part > 255)) {
      return false;
    }

    // Only allow public IP ranges
    return (
      parts[0] !== 0 &&
      parts[0] !== 10 &&
      parts[0] !== 127 &&
      !(parts[0] === 169 && parts[1] === 254) &&
      !(parts[0] === 172 && parts[1] >= 16 && parts[1] <= 31) &&
      !(parts[0] === 192 && parts[1] === 168) &&
      !(parts[0] >= 224 && parts[0] <= 239) &&
      !(parts[0] >= 240 && parts[0] <= 255) &&
      !(parts[0] === 100 && parts[1] >= 64 && parts[1] <= 127) &&
      !(parts[0] === 9 && parts[1] === 0) &&
      !(parts[0] === 11 && parts[1] === 0)
    );
  } catch {
    return false; // If URL parsing fails, reject it as potentially unsafe
  }
};