Index: node_modules/pg/lib/connection-parameters.js
===================================================================
--- node_modules/pg/lib/connection-parameters.js	(revision 62b296460f935ff5cc47a75f6567f97df5a244a7)
+++ node_modules/pg/lib/connection-parameters.js	(revision 62b296460f935ff5cc47a75f6567f97df5a244a7)
@@ -0,0 +1,184 @@
+'use strict'
+
+const dns = require('dns')
+
+const defaults = require('./defaults')
+
+const parse = require('pg-connection-string').parse // parses a connection string
+
+const val = function (key, config, envVar) {
+  if (config[key]) {
+    return config[key]
+  }
+
+  if (envVar === undefined) {
+    envVar = process.env['PG' + key.toUpperCase()]
+  } else if (envVar === false) {
+    // do nothing ... use false
+  } else {
+    envVar = process.env[envVar]
+  }
+
+  return envVar || defaults[key]
+}
+
+const readSSLConfigFromEnvironment = function () {
+  switch (process.env.PGSSLMODE) {
+    case 'disable':
+      return false
+    case 'prefer':
+    case 'require':
+    case 'verify-ca':
+    case 'verify-full':
+      return true
+    case 'no-verify':
+      return { rejectUnauthorized: false }
+  }
+  return defaults.ssl
+}
+
+// Convert arg to a string, surround in single quotes, and escape single quotes and backslashes
+const quoteParamValue = function (value) {
+  return "'" + ('' + value).replace(/\\/g, '\\\\').replace(/'/g, "\\'") + "'"
+}
+
+const add = function (params, config, paramName) {
+  const value = config[paramName]
+  if (value !== undefined && value !== null) {
+    params.push(paramName + '=' + quoteParamValue(value))
+  }
+}
+
+class ConnectionParameters {
+  constructor(config) {
+    // if a string is passed, it is a raw connection string so we parse it into a config
+    config = typeof config === 'string' ? parse(config) : config || {}
+
+    // if the config has a connectionString defined, parse IT into the config we use
+    // this will override other default values with what is stored in connectionString
+    if (config.connectionString) {
+      config = Object.assign({}, config, parse(config.connectionString))
+    }
+
+    this.user = val('user', config)
+    this.database = val('database', config)
+
+    if (this.database === undefined) {
+      this.database = this.user
+    }
+
+    this.port = parseInt(val('port', config), 10)
+    this.host = val('host', config)
+
+    // "hiding" the password so it doesn't show up in stack traces
+    // or if the client is console.logged
+    Object.defineProperty(this, 'password', {
+      configurable: true,
+      enumerable: false,
+      writable: true,
+      value: val('password', config),
+    })
+
+    this.binary = val('binary', config)
+    this.options = val('options', config)
+
+    this.ssl = typeof config.ssl === 'undefined' ? readSSLConfigFromEnvironment() : config.ssl
+
+    if (typeof this.ssl === 'string') {
+      if (this.ssl === 'true') {
+        this.ssl = true
+      }
+    }
+    // support passing in ssl=no-verify via connection string
+    if (this.ssl === 'no-verify') {
+      this.ssl = { rejectUnauthorized: false }
+    }
+    if (this.ssl && this.ssl.key) {
+      Object.defineProperty(this.ssl, 'key', {
+        enumerable: false,
+      })
+    }
+
+    // How to negotiate SSL: 'postgres' (default, the traditional SSLRequest
+    // handshake) or 'direct' (start the TLS handshake immediately on connect).
+    this.sslnegotiation = val('sslnegotiation', config, 'PGSSLNEGOTIATION')
+    if (this.sslnegotiation !== undefined && this.sslnegotiation !== 'postgres' && this.sslnegotiation !== 'direct') {
+      throw new Error(
+        `Invalid sslnegotiation value: "${this.sslnegotiation}". Valid values are "postgres" and "direct".`
+      )
+    }
+    if (this.sslnegotiation === 'direct' && !this.ssl) {
+      throw new Error('sslnegotiation=direct requires SSL to be enabled')
+    }
+
+    this.client_encoding = val('client_encoding', config)
+    this.replication = val('replication', config)
+    // a domain socket begins with '/'
+    this.isDomainSocket = !(this.host || '').indexOf('/')
+
+    this.application_name = val('application_name', config, 'PGAPPNAME')
+    this.fallback_application_name = val('fallback_application_name', config, false)
+    this.statement_timeout = val('statement_timeout', config, false)
+    this.lock_timeout = val('lock_timeout', config, false)
+    this.idle_in_transaction_session_timeout = val('idle_in_transaction_session_timeout', config, false)
+    this.query_timeout = val('query_timeout', config, false)
+
+    if (config.connectionTimeoutMillis === undefined) {
+      this.connect_timeout = process.env.PGCONNECT_TIMEOUT || 0
+    } else {
+      this.connect_timeout = Math.floor(config.connectionTimeoutMillis / 1000)
+    }
+
+    if (config.keepAlive === false) {
+      this.keepalives = 0
+    } else if (config.keepAlive === true) {
+      this.keepalives = 1
+    }
+
+    if (typeof config.keepAliveInitialDelayMillis === 'number') {
+      this.keepalives_idle = Math.floor(config.keepAliveInitialDelayMillis / 1000)
+    }
+  }
+
+  getLibpqConnectionString(cb) {
+    const params = []
+    add(params, this, 'user')
+    add(params, this, 'password')
+    add(params, this, 'port')
+    add(params, this, 'application_name')
+    add(params, this, 'fallback_application_name')
+    add(params, this, 'connect_timeout')
+    add(params, this, 'options')
+
+    const ssl = typeof this.ssl === 'object' ? this.ssl : this.ssl ? { sslmode: this.ssl } : {}
+    add(params, ssl, 'sslmode')
+    add(params, ssl, 'sslca')
+    add(params, ssl, 'sslkey')
+    add(params, ssl, 'sslcert')
+    add(params, ssl, 'sslrootcert')
+    add(params, this, 'sslnegotiation')
+
+    if (this.database) {
+      params.push('dbname=' + quoteParamValue(this.database))
+    }
+    if (this.replication) {
+      params.push('replication=' + quoteParamValue(this.replication))
+    }
+    if (this.host) {
+      params.push('host=' + quoteParamValue(this.host))
+    }
+    if (this.isDomainSocket) {
+      return cb(null, params.join(' '))
+    }
+    if (this.client_encoding) {
+      params.push('client_encoding=' + quoteParamValue(this.client_encoding))
+    }
+    dns.lookup(this.host, function (err, address) {
+      if (err) return cb(err, null)
+      params.push('hostaddr=' + quoteParamValue(address))
+      return cb(null, params.join(' '))
+    })
+  }
+}
+
+module.exports = ConnectionParameters