alexia/src/create-request.js

'use strict';
const _ = require('lodash');

/**
 * Creates simple Alexa request
 */
const requestBuilder = (requestType, intent, isNew, attrs, appId) => {

  const request = {
    session: {
      attributes: attrs || {},
      sessionId: 'SessionId.357a6s7',
      application: {
        applicationId: appId || 'amzn1.echo-sdk-123456'
      },
      user: {
        userId: 'amzn1.account.abc123'
      },
      new: isNew || false
    },
    request: {
      type: requestType,
      requestId: 'EdwRequestId.abc123456',
      timestamp: '2016-06-16T14:38:46Z',
      intent: intent
    }
  };

  return request;
};

module.exports = {
  /**
   * Creates LaunchRequest
   * @param {Object} attrs - Session attributes
   * @param {String} [appId] - Application id
   */
  launchRequest: (attrs, appId) => {
    return requestBuilder('LaunchRequest', null, true, attrs, appId);
  },

  /**
   * Creates SessionEndedRequest
   * @param {Object} attrs - Session attributes
   * @param {String} [appId] - Application id
   */
  sessionEndedRequest: (attrs, appId) => {
    return requestBuilder('SessionEndedRequest', null, false, attrs, appId);
  },

  /**
   * Creates IntentRequest
   * @param {String} name - Name of the intent to be invoked
   * @param {Object} [slots] - Slots in simplified key:value schema. Defaults to {}
   * @param {Object} [attrs] - Session attributes. Defaults to {}
   * @param {boolean} [isNew] - Whether session is new. Defaults to false
   * @param {String} [appId] - Application id
   */
  intentRequest: (name, slots, attrs, isNew, appId) => {

    // Transform slots from minimal schema into slot schema sent by Amazon
    let transformedSlots = _.transform(slots, (result, key, value) => {
      result[key] = {
        name: value,
        value: key
      };
    }, {});

    return requestBuilder('IntentRequest', {
      name: name,
      slots: slots ? transformedSlots : undefined
    }, isNew, attrs, appId);
  }
};