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examples/demoserver/u2f-api.js  view on Meta::CPAN

 * @param {function(MessagePort)} callback
 * @private
 */
u2f.getIframePort_ = function(callback) {
  // Create the iframe
  var iframeOrigin = 'chrome-extension://' + u2f.EXTENSION_ID;
  var iframe = document.createElement('iframe');
  iframe.src = iframeOrigin + '/u2f-comms.html';
  iframe.setAttribute('style', 'display:none');
  document.body.appendChild(iframe);

  var channel = new MessageChannel();
  var ready = function(message) {
    if (message.data == 'ready') {
      channel.port1.removeEventListener('message', ready);
      callback(channel.port1);
    } else {
      console.error('First event on iframe port was not "ready"');
    }
  };
  channel.port1.addEventListener('message', ready);
  channel.port1.start();

  iframe.addEventListener('load', function() {
    // Deliver the port to the iframe and initialize
    iframe.contentWindow.postMessage('init', iframeOrigin, [channel.port2]);
  });
};


//High-level JS API

/**
 * Default extension response timeout in seconds.
 * @const
 */
u2f.EXTENSION_TIMEOUT_SEC = 30;

/**
 * A singleton instance for a MessagePort to the extension.
 * @type {MessagePort|u2f.WrappedChromeRuntimePort_}
 * @private
 */
u2f.port_ = null;

/**
 * Callbacks waiting for a port
 * @type {Array<function((MessagePort|u2f.WrappedChromeRuntimePort_))>}
 * @private
 */
u2f.waitingForPort_ = [];

/**
 * A counter for requestIds.
 * @type {number}
 * @private
 */
u2f.reqCounter_ = 0;

/**
 * A map from requestIds to client callbacks
 * @type {Object.<number,(function((u2f.Error|u2f.RegisterResponse))
 *                       |function((u2f.Error|u2f.SignResponse)))>}
 * @private
 */
u2f.callbackMap_ = {};

/**
 * Creates or retrieves the MessagePort singleton to use.
 * @param {function((MessagePort|u2f.WrappedChromeRuntimePort_))} callback
 * @private
 */
u2f.getPortSingleton_ = function(callback) {
  if (u2f.port_) {
    callback(u2f.port_);
  } else {
    if (u2f.waitingForPort_.length == 0) {
      u2f.getMessagePort(function(port) {
        u2f.port_ = port;
        u2f.port_.addEventListener('message',
            /** @type {function(Event)} */ (u2f.responseHandler_));

        // Careful, here be async callbacks. Maybe.
        while (u2f.waitingForPort_.length)
          u2f.waitingForPort_.shift()(u2f.port_);
      });
    }
    u2f.waitingForPort_.push(callback);
  }
};

/**
 * Handles response messages from the extension.
 * @param {MessageEvent.<u2f.Response>} message
 * @private
 */
u2f.responseHandler_ = function(message) {
  var response = message.data;
  var reqId = response['requestId'];
  if (!reqId || !u2f.callbackMap_[reqId]) {
    console.error('Unknown or missing requestId in response.');
    return;
  }
  var cb = u2f.callbackMap_[reqId];
  delete u2f.callbackMap_[reqId];
  cb(response['responseData']);
};

/**
 * Dispatches an array of sign requests to available U2F tokens.
 * If the JS API version supported by the extension is unknown, it first sends a
 * message to the extension to find out the supported API version and then it sends
 * the sign request.
 * @param {string=} appId
 * @param {string=} challenge
 * @param {Array<u2f.RegisteredKey>} registeredKeys
 * @param {function((u2f.Error|u2f.SignResponse))} callback
 * @param {number=} opt_timeoutSeconds
 */
u2f.sign = function(appId, challenge, registeredKeys, callback, opt_timeoutSeconds) {
  if (js_api_version === undefined) {
    // Send a message to get the extension to JS API version, then send the actual sign request.
    u2f.getApiVersion(
        function (response) {
          js_api_version = response['js_api_version'] === undefined ? 0 : response['js_api_version'];
          console.log("Extension JS API Version: ", js_api_version);
          u2f.sendSignRequest(appId, challenge, registeredKeys, callback, opt_timeoutSeconds);
        });
  } else {
    // We know the JS API version. Send the actual sign request in the supported API version.
    u2f.sendSignRequest(appId, challenge, registeredKeys, callback, opt_timeoutSeconds);
  }
};

/**
 * Dispatches an array of sign requests to available U2F tokens.
 * @param {string=} appId
 * @param {string=} challenge
 * @param {Array<u2f.RegisteredKey>} registeredKeys
 * @param {function((u2f.Error|u2f.SignResponse))} callback
 * @param {number=} opt_timeoutSeconds
 */
u2f.sendSignRequest = function(appId, challenge, registeredKeys, callback, opt_timeoutSeconds) {