@dinoboff/ims-lti/lib/memory-nonce-store.js

Module for building an LTI Tool Provider and accept LTI launch requests

// Generated by CoffeeScript 1.12.7
(function() {
  var EXPIRE_IN_SEC, MemoryNonceStore, NonceStore, exports,
    extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
    hasProp = {}.hasOwnProperty;

  NonceStore = require('./nonce-store');

  EXPIRE_IN_SEC = 5 * 60;

  MemoryNonceStore = (function(superClass) {
    extend(MemoryNonceStore, superClass);

    function MemoryNonceStore() {
      this.used = Object.create(null);
    }

    MemoryNonceStore.prototype.isNew = function(nonce, timestamp, next) {
      var firstTimeSeen;
      if (next == null) {
        next = function() {};
      }
      if (typeof nonce === 'undefined' || nonce === null || typeof nonce === 'function' || typeof timestamp === 'function' || typeof timestamp === 'undefined') {
        return next(new Error('Invalid parameters'), false);
      }
      this._clearNonces();
      firstTimeSeen = this.used[nonce] === void 0;
      if (!firstTimeSeen) {
        return next(new Error('Nonce already seen'), false);
      }
      return this.setUsed(nonce, timestamp, function(err) {
        var currentTime, timestampIsFresh;
        if (typeof timestamp !== 'undefined' && timestamp !== null) {
          timestamp = parseInt(timestamp, 10);
          currentTime = Math.round(Date.now() / 1000);
          timestampIsFresh = (currentTime - timestamp) <= EXPIRE_IN_SEC;
          if (timestampIsFresh) {
            return next(null, true);
          } else {
            return next(new Error('Expired timestamp'), false);
          }
        } else {
          return next(new Error('Timestamp required'), false);
        }
      });
    };

    MemoryNonceStore.prototype.setUsed = function(nonce, timestamp, next) {
      if (next == null) {
        next = function() {};
      }
      this.used[nonce] = timestamp + EXPIRE_IN_SEC;
      return next(null);
    };

    MemoryNonceStore.prototype._clearNonces = function() {
      var expiry, nonce, now, ref;
      now = Math.round(Date.now() / 1000);
      ref = this.used;
      for (nonce in ref) {
        expiry = ref[nonce];
        if (expiry <= now) {
          delete this.used[nonce];
        }
      }
    };

    return MemoryNonceStore;

  })(NonceStore);

  exports = module.exports = MemoryNonceStore;

}).call(this);