domotz-remote-pawn/src/bootstrap/env.js

Domotz Agent

/** This file is part of Domotz Agent.
  * Copyright (C) 2016  Domotz Ltd
  *
  * Domotz Agent is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  *
  * Domotz Agent is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Domotz Agent.  If not, see <http://www.gnu.org/licenses/>.
  **/
/**
 *
 * Created by Tommaso Latini <tommaso@domotz.com> on 26/09/2015
 */

const DOMOTZ_ENV = '/etc/domotz.env';
const ENV_VAR_REGEXP = /\s*export ([\w\.\-]+)\s*=\s*["']?([^'"]*)?["]?\s*/;

var fs = require('fs');


module.exports.load = function(envFile) {

    // Configure the environment [For OpenWRT]
    // N.B. It's ok also for the other architectures
    var env = process.env;
    var content = fs.readFileSync(envFile || DOMOTZ_ENV, {encoding: 'utf8'});
    var lines = content.toString().split('\n');

    lines.forEach(function (line) {

        var keyValueArr = line.match(ENV_VAR_REGEXP);
        if (keyValueArr !== null) {
            var key = keyValueArr[1],
                value = keyValueArr[2];
            if (value) {
                // Remove processes
                if (value.charAt(0) === '`' || value.slice(0,2) === '$(') {
                    return;
                }

                // Expand newlines in quoted values
                var len = value ? value.length : 0;
                if (len > 0 && value.charAt(0) === '\"' && value.charAt(len - 1) === '\"') {
                    value = value.replace(/\\n/gm, '\n');
                }

                // Replace recursive environment variables
                env[key] = value.replace(/\${[A-Z_]+}/g, function (str) {
                        return process.env[(/\$[{]?([A-Z_]+)[}]?/).exec(str)[1]];
                    }) || env[key];
            }
        }
    });
};