@slack/client/lib/models/helpers.js

A library for creating a Slack client

var hasKey = require('lodash').has;

// Channel, file, group, DM, user, usergroup
var RECOGNIZED_API_TYPE_PREFIXES = ['C', 'F', 'G', 'D', 'U', 'W', 'S'];


/**
 * Tests whether a supplied JSON object represents a Slack API type.
 * @param {Object} obj
 * @returns {boolean}
 */
var isModelObj = function isModelObj(obj) {
  if (hasKey(obj, 'id')) {
    return RECOGNIZED_API_TYPE_PREFIXES.indexOf(obj.id.substr(0, 1)) !== -1;
  }

  return false;
};


/**
 * Returns the model class for the JSON object from the Slack API.
 */
var getModelClass = function getModelClass(obj) {
  var modelClass;
  var apiTypePrefix = obj.id.substr(0, 1);

  if (apiTypePrefix === 'C') {
    modelClass = require('./channel');
  } else if (apiTypePrefix === 'F') {
    modelClass = require('./file');
  } else if (apiTypePrefix === 'D') {
    modelClass = require('./dm');
  } else if (apiTypePrefix === 'U' || apiTypePrefix === 'W') {
    modelClass = require('./user');
  } else if (apiTypePrefix === 'S') {
    modelClass = require('./user-group');
  } else {
    // The MPDM and Group classes share the same prefix, so do an extra check here
    if (apiTypePrefix === 'G') {
      if (obj.is_mpim) {
        modelClass = require('./mpdm');
      }

      if (obj.is_group) {
        modelClass = require('./group');
      }
    }
  }

  return modelClass;
};


module.exports.isModelObj = isModelObj;
module.exports.getModelClass = getModelClass;