nconf-lite/lib/nconf/stores/env.js

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