chrome/browser/resources/cryptotoken/requesthelper.js

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * @fileoverview Provides a "bottom half" helper to assist with raw requests.
   7  * This fills the same role as the Authenticator-Specific Module component of
   8  * U2F documents, although the API is different.
   9  */
  10 'use strict';
  11
  12 /**
  13  * @typedef {{
  14  *   type: string,
  15  *   timeout: number
  16  * }}
  17  */
  18 var HelperRequest;
  19
  20 /**
  21  * @typedef {{
  22  *   type: string,
  23  *   code: (number|undefined)
  24  * }}
  25  */
  26 var HelperReply;
  27
  28 /**
  29  * A helper to process requests.
  30  * @interface
  31  */
  32 function RequestHelper() {}
  33
  34 /**
  35  * Gets a handler for a request.
  36  * @param {HelperRequest} request The request to handle.
  37  * @return {RequestHandler} A handler for the request.
  38  */
  39 RequestHelper.prototype.getHandler = function(request) {};
  40
  41 /**
  42  * A handler to track an outstanding request.
  43  * @extends {Closeable}
  44  * @interface
  45  */
  46 function RequestHandler() {}
  47
  48 /** @typedef {function(HelperReply, string=)} */
  49 var RequestHandlerCallback;
  50
  51 /**
  52  * @param {RequestHandlerCallback} cb Called with the result of the request,
  53  *     and an optional source for the result.
  54  * @return {boolean} Whether this handler could be run.
  55  */
  56 RequestHandler.prototype.run = function(cb) {};
  57
  58 /** Closes this handler. */
  59 RequestHandler.prototype.close = function() {};
  60
  61 /**
  62  * Makes a response to a helper request with an error code.
  63  * @param {HelperRequest} request The request to make a response to.
  64  * @param {DeviceStatusCodes} code The error code to return.
  65  * @param {string=} opt_defaultType The default response type, if none is
  66  *     present in the request.
  67  * @return {HelperReply} The helper error response.
  68  */
  69 function makeHelperErrorResponse(request, code, opt_defaultType) {
  70   var type;
  71   if (request && request.type) {
  72     type = request.type.replace(/_request$/, '_reply');
  73   } else {
  74     type = opt_defaultType || 'unknown_type_reply';
  75   }
  76   var reply = {
  77     'type': type,
  78     'code': /** @type {number} */ (code)
  79   };
  80   return reply;
  81 }