114 lines
2.6 KiB
JavaScript
114 lines
2.6 KiB
JavaScript
/*
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* env.js: Simple memory-based store for environment variables
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*
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* (C) 2011, Charlie Robbins and the Contributors.
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*
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*/
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var util = require('util'),
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common = require('../common'),
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Memory = require('./memory').Memory;
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//
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// ### function Env (options)
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// #### @options {Object} Options for this instance.
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// Constructor function for the Env nconf store, a simple abstraction
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// around the Memory store that can read process environment variables.
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//
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var Env = exports.Env = function (options) {
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Memory.call(this, options);
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options = options || {};
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this.type = 'env';
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this.readOnly = options.readOnly !== undefined? options.readOnly : true;
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this.whitelist = options.whitelist || [];
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this.separator = options.separator || '';
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this.lowerCase = options.lowerCase || false;
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this.parseValues = options.parseValues || false;
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this.transform = options.transform || false;
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if (({}).toString.call(options.match) === '[object RegExp]'
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&& typeof options !== 'string') {
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this.match = options.match;
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}
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if (options instanceof Array) {
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this.whitelist = options;
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}
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if (typeof(options) === 'string' || options instanceof RegExp) {
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this.separator = options;
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}
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};
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// Inherit from the Memory store
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util.inherits(Env, Memory);
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//
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// ### function loadSync ()
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// Loads the data passed in from `process.env` into this instance.
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//
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Env.prototype.loadSync = function () {
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this.loadEnv();
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return this.store;
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};
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//
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// ### function loadEnv ()
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// Loads the data passed in from `process.env` into this instance.
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//
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Env.prototype.loadEnv = function () {
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var self = this;
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var env = process.env;
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if (this.lowerCase) {
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env = {};
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Object.keys(process.env).forEach(function (key) {
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env[key.toLowerCase()] = process.env[key];
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});
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}
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if (this.transform) {
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env = common.transform(env, this.transform);
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}
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var tempWrite = false;
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if(this.readOnly) {
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this.readOnly = false;
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tempWrite = true;
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}
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Object.keys(env).filter(function (key) {
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if (self.match && self.whitelist.length) {
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return key.match(self.match) || self.whitelist.indexOf(key) !== -1
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}
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else if (self.match) {
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return key.match(self.match);
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}
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else {
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return !self.whitelist.length || self.whitelist.indexOf(key) !== -1
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}
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}).forEach(function (key) {
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var val = env[key];
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if (self.parseValues) {
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val = common.parseValues(val);
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}
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if (self.separator) {
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self.set(common.key.apply(common, key.split(self.separator)), val);
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}
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else {
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self.set(key, val);
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}
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});
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if (tempWrite) {
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this.readOnly = true;
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}
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return this.store;
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};
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