File: opaque-origin-sandbox.html

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<!DOCTYPE html>
<script>
  'use strict'

  // Sends two messages to its creator:
  // (1) The result of chooseFileSystemEntries().
  // (2) The result of FileSystemDirectoryHandle.getSystemDirectory().

  function post_message(data) {
    if (window.parent !== null) {
      window.parent.postMessage(data, { targetOrigin: '*' });
    }
    if (window.opener !== null) {
      window.opener.postMessage(data, { targetOrigin: '*' });
    }
  }

  try {
    window.chooseFileSystemEntries({ type: 'open-directory' })
      .then(() => {
        post_message('chooseFileSystemEntries(): FULFILLED');
      }).catch(error => {
        post_message(`chooseFileSystemEntries(): REJECTED: ${error.name}`);
      });
  } catch (error) {
    post_message(`chooseFileSystemEntries(): EXCEPTION: ${error.name}`);
  }

  try {
    window.FileSystemDirectoryHandle.getSystemDirectory({ type: 'sandbox' })
      .then(() => {
        post_message('getSystemDirectory(): FULFILLED');
      }).catch(error => {
        post_message(`getSystemDirectory(): REJECTED: ${error.name}`);
      });
  } catch (error) {
    post_message(`getSystemDirectory(): EXCEPTION: ${error.name}`);
  }
</script>