Function refreshRoots

examples/pdf-server/server.ts:954–985

* Query the client for roots and update allowedLocalDirs with any file:// roots * that point to existing directories.

(server: Server)

 * that point to existing directories.
 */
async function refreshRoots(server: Server): Promise<void> {
  if (!server.getClientCapabilities()?.roots) return;

  try {
    const { roots } = await server.listRoots();
    allowedLocalDirs.clear();
    for (const root of roots) {
      if (isFileUrl(root.uri)) {
        const dir = fileUrlToPath(root.uri);
        const resolved = path.resolve(dir);
        try {
          const s = fs.statSync(resolved);
          if (s.isFile()) {
            console.error(
              `[pdf-server] Root is a file, not a directory (skipped): ${resolved}`,
            );
            allowedLocalFiles.add(resolved);
          } else if (s.isDirectory()) {
            allowedLocalDirs.add(resolved);
            console.error(`[pdf-server] Root directory allowed: ${resolved}`);
          }
        } catch {
          // stat failed — skip non-existent roots
        }
      }
    }
  } catch (err) {
    console.error(
      `[pdf-server] Failed to list roots: ${err instanceof Error ? err.message : err}`,
    );
  }
}

// =============================================================================
// PDF Form Field Extraction