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express-server/node_modules/pg/lib/connection-parameters.js

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+'use strict'
+/**
+ * Copyright (c) 2010-2017 Brian Carlson (brian.m.carlson@gmail.com)
+ * All rights reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * README.md file in the root directory of this source tree.
+ */
+
+var dns = require('dns')
+
+var defaults = require('./defaults')
+
+var parse = require('pg-connection-string').parse // parses a connection string
+
+var val = function (key, config, envVar) {
+  if (envVar === undefined) {
+    envVar = process.env[ 'PG' + key.toUpperCase() ]
+  } else if (envVar === false) {
+    // do nothing ... use false
+  } else {
+    envVar = process.env[ envVar ]
+  }
+
+  return config[key] ||
+    envVar ||
+    defaults[key]
+}
+
+var useSsl = function () {
+  switch (process.env.PGSSLMODE) {
+    case 'disable':
+      return false
+    case 'prefer':
+    case 'require':
+    case 'verify-ca':
+    case 'verify-full':
+      return true
+  }
+  return defaults.ssl
+}
+
+var ConnectionParameters = function (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)
+  this.port = parseInt(val('port', config), 10)
+  this.host = val('host', config)
+  this.password = val('password', config)
+  this.binary = val('binary', config)
+  this.ssl = typeof config.ssl === 'undefined' ? useSsl() : config.ssl
+  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)
+}
+
+// Convert arg to a string, surround in single quotes, and escape single quotes and backslashes
+var quoteParamValue = function (value) {
+  return "'" + ('' + value).replace(/\\/g, '\\\\').replace(/'/g, "\\'") + "'"
+}
+
+var add = function (params, config, paramName) {
+  var value = config[paramName]
+  if (value) {
+    params.push(paramName + '=' + quoteParamValue(value))
+  }
+}
+
+ConnectionParameters.prototype.getLibpqConnectionString = function (cb) {
+  var params = []
+  add(params, this, 'user')
+  add(params, this, 'password')
+  add(params, this, 'port')
+  add(params, this, 'application_name')
+  add(params, this, 'fallback_application_name')
+
+  var ssl = typeof this.ssl === 'object' ? 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')
+
+  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