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/*! * Module dependencies. */
'use strict';
const MongooseError = require('./mongooseError');const allServersUnknown = require('../helpers/topology/allServersUnknown');const isAtlas = require('../helpers/topology/isAtlas');const isSSLError = require('../helpers/topology/isSSLError');
/*! * ignore */
const atlasMessage = 'Could not connect to any servers in your MongoDB Atlas cluster. ' +  'One common reason is that you\'re trying to access the database from ' +  'an IP that isn\'t whitelisted. Make sure your current IP address is on your Atlas ' +  'cluster\'s IP whitelist: https://docs.atlas.mongodb.com/security-whitelist/';
const sslMessage = 'Mongoose is connecting with SSL enabled, but the server is ' +  'not accepting SSL connections. Please ensure that the MongoDB server you are ' +  'connecting to is configured to accept SSL connections. Learn more: ' +  'https://mongoosejs.com/docs/tutorials/ssl.html';
class MongooseServerSelectionError extends MongooseError {  /**   * MongooseServerSelectionError constructor   *   * @api private   */  assimilateError(err) {    const reason = err.reason;    // Special message for a case that is likely due to IP whitelisting issues.    const isAtlasWhitelistError = isAtlas(reason) &&      allServersUnknown(reason) &&      err.message.indexOf('bad auth') === -1 &&      err.message.indexOf('Authentication failed') === -1;
    if (isAtlasWhitelistError) {      this.message = atlasMessage;    } else if (isSSLError(reason)) {      this.message = sslMessage;    } else {      this.message = err.message;    }    for (const key in err) {      if (key !== 'name') {        this[key] = err[key];      }    }
    return this;  }}
Object.defineProperty(MongooseServerSelectionError.prototype, 'name', {  value: 'MongooseServerSelectionError'});
module.exports = MongooseServerSelectionError;