ng-server/lib/helper.js

A NodeJs server for Angular 2 applications

/*eslint-env node */

var zlib = require('zlib');
var fs = require('fs');

var MimeType = require('./mime-types');

// SEND 404 ERROR MESSAGE
var sendErr404 = function (res, msg) {
    var jsonMsg = '{ code: 404, message: "' + (msg || 'File not found.') + '" }';
    
    res.setHeader('Content-Type', MimeType['.json']);
    res.status(404);
    res.send(jsonMsg);
};
exports.sendErr404 = sendErr404;

// SEND 403 ERROR MESSAGE
var sendErr403 = function (res, msg) {
    var jsonMsg = '{ code: 403, message: "' + (msg || 'Prohibited.') + '" }';
    
    res.setHeader('Content-Type', MimeType['.json']);
    res.status(403);
    res.send(jsonMsg);
};
exports.sendErr403 = sendErr403;

// SEND 500 ERROR MESSAGE
var sendErr500 = function (res, msg) {
    var jsonMsg = '{ code: 500, message: "' + (msg || 'Internal error.') + '" }';
    
    res.setHeader('Content-Type', MimeType['.json']);
    res.status(500);
    res.send(jsonMsg);
};
exports.sendErr500 = sendErr500;

// READ A FILE OR SEND A ERROR MSG
exports.readFile = function (res, file, callback) {
    fs.access(file, function (err) {
        if (err) sendErr404(res, err);
        
        fs.readFile(file, function (err, data) {
            if (err) sendErr500(res, err);
            
            callback(data);
        });
    });
};

// READ A FILE OR MOVE NEXT ON 404
exports.readFileOrMoveNext = function (res, next, file, callback) {
    fs.access(file, function (err) {
        if (err) {
            next();
            return;
        }
        
        fs.readFile(file, function (err, data) {
            if (err) sendErr500(res, err);
            
            callback(data);
        });
    });
};

// COMPRESS FILES
var testToCompress = /\.(html|css|js)$/;
exports.testToCompress = testToCompress;

exports.compressFile = function (data, callback) {
    zlib.gzip(data, callback);
};

// BUILD RESPONSE HEADERS
exports.buildResponseHeaders = function (res, context, file) {
    res.setHeader('Content-Type', MimeType.get(srcUrl));
            res.setHeader('Access-Control-Allow-Origin', context[req.$path].cors);
            res.setHeader('Content-Encoding', 'gzip');
}