Function createExtensionScript

src/service/extension-script.js:128–187

(win, extensionId, version)

 * @return {!Element} Script object
 */
export function createExtensionScript(win, extensionId, version) {
  const scriptElement = win.document.createElement('script');
  scriptElement.async = true;
  if (isIntermediateExtension(extensionId)) {
    version = '';
  } else {
    scriptElement.setAttribute(
      CUSTOM_TEMPLATES.indexOf(extensionId) >= 0
        ? 'custom-template'
        : 'custom-element',
      extensionId
    );
  }
  scriptElement.setAttribute('data-script', extensionId);
  scriptElement.setAttribute('i-amphtml-inserted', '');
  if (mode.isEsm()) {
    scriptElement.setAttribute('type', 'module');
  }
  propagateNonce(win.document, scriptElement);

  // Allow error information to be collected
  // https://github.com/ampproject/amphtml/issues/7353
  scriptElement.setAttribute('crossorigin', 'anonymous');
  let loc = win.location;
  if (getMode(win).test && win.testLocation) {
    loc = win.testLocation;
  }
  const scriptSrc = calculateExtensionScriptUrl(
    loc,
    extensionId,
    version,
    getMode(win).localDev
  );

  let policy = {
    createScriptURL: function (url) {
      // Only allow trusted URLs
      if (
        regexURL.test(url) ||
        ((getMode().test || getMode().localDev) &&
          testRegexURL.test(new URL(url).hostname)) ||
        new URL(url).host === 'fonts.googleapis.com'
      ) {
        return url;
      } else {
        return '';
      }
    },
  };

  if (self.trustedTypes && self.trustedTypes.createPolicy) {
    policy = self.trustedTypes.createPolicy(
      'extension-script#createExtensionScript',
      policy
    );
  }

  scriptElement.src = policy.createScriptURL(scriptSrc);