Function detectCloudProvider

src/utils/urlCloudStorage.ts:7–47

(url: string)

 * Returns null if not a recognized cloud storage URL.
 */
export function detectCloudProvider(url: string): CloudProvider | null {
  // Check URI schemes first
  if (url.startsWith('s3://')) return 's3';
  if (url.startsWith('gs://')) return 'gcs';

  try {
    const parsed = new URL(url);
    const hostname = parsed.hostname.toLowerCase();

    // AWS S3 patterns
    if (hostname.endsWith('.s3.amazonaws.com') ||
        hostname.includes('.s3.') && hostname.endsWith('.amazonaws.com') ||
        hostname === 's3.amazonaws.com') {
      return 's3';
    }

    // Google Cloud Storage patterns
    if (hostname === 'storage.googleapis.com' ||
        hostname === 'storage.cloud.google.com' ||
        hostname.endsWith('.storage.googleapis.com')) {
      return 'gcs';
    }

    // Cloudflare R2 patterns (*.r2.cloudflarestorage.com or custom domains with r2)
    if (hostname.endsWith('.r2.cloudflarestorage.com') ||
        hostname.endsWith('.r2.dev')) {
      return 'r2';
    }

    // Dropbox patterns
    if (hostname === 'www.dropbox.com' ||
        hostname === 'dropbox.com' ||
        hostname === 'dl.dropboxusercontent.com') {
      return 'dropbox';
    }

    return null;
  } catch {
    return null;
  }
}

/**
 * Check if URL appears to be a pre-signed URL (has signature parameters).