enhancer-data-bridge/routes/module-loader.js

A bridge between Enhancer Clould and user business datasource

var fs = require('fs-extra');
var path = require('path');
var os = require('os');
var express = require( 'express' );
var router = express.Router();
var requireNocache = require('require-nocache')(module);
var head = "var requireNocache = require('require-nocache')(module);";
var moduleBase = path.resolve(__dirname, '../repository/project/custom-module');
if (os.platform() === 'win32') {
    moduleBase = moduleBase.replace(/\\/g, '/') + '/';
} else {
    moduleBase = moduleBase + '/';
}

router.post('/loadModule', function(req, res) {
    var mod = req.body;
    if (!mod.name || typeof mod.module === 'undefined') {
    	return res.end();
    }

    mod.module = head + '\n' + mod.module.replace(/require\(\s*(\'|\")@custom\//g, function(s, $1) {
                return 'requireNocache(' + $1 + moduleBase;
            });
    var p = moduleBase + mod.name + '.js';
    fs.ensureFileSync(p);
    fs.writeFileSync(p, mod.module);

    try {
    	requireNocache(p);
    } catch(e) {
        var message = 'The module has error:<br>' + e.stack.replace(moduleBase, '@custom/');
        console.error('Load module ' + mod.name + ' failed:');
        console.error(message);
        res.send({success: false, message: message });
        return;
    }
    console.log('Module loaded: ' + mod.name);
    res.send({success: true, message: 'ok'});
});

router.options('/loadModule', function (req, res) {
    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Methods', 'GET,POST,OPTIONS');
    res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization, Content-Length, X-Requested-With');
    res.sendStatus(200);
});


router.post('/loadAllModules', function(req, res) {
    var list = req.body.moduleList;
    if (!list) {
        return res.end();
    }

    list.forEach(function(l) {
        l.module = head + l.module.replace(/require\(\s*(\'|\")@custom\//g, function(s, $1) {
                    return 'requireNocache(' + $1 + moduleBase;
                });
        var p = moduleBase + l.name + '.js';
        fs.ensureFileSync(p);
        fs.writeFileSync(p, l.module);
        console.log('Module loaded: ' + l.name);
    });
    res.send({success: true, message: 'ok'});
});

router.options('/loadAllModules', function (req, res) {
    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Methods', 'GET,POST,OPTIONS');
    res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization, Content-Length, X-Requested-With');
    res.sendStatus(200);
});



module.exports = router;