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Reasonably Secure Electron
Copyright (C) 2019 Bishop Fox
This program 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 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Implementing a custom protocol achieves two goals:
1) Allows us to use ES6 modules/targets for Angular
2) Avoids running the app in a file:// origin
import * as fs from 'fs';
import * as path from 'path';
type ProtocolCallback = (arg0: { mimeType: string; charset: string; data: Buffer; }) => void;
const DIST_PATH = path.join(__dirname, 'dist');
export const scheme = 'app';
const mimeTypes = {
'.js': 'text/javascript',
'.mjs': 'text/javascript',
'.html': 'text/html',
'.htm': 'text/html',
'.json': 'application/json',
'.css': 'text/css',
'.svg': 'application/svg+xml',
'.ico': 'image/',
'.png': 'image/png',
'.jpg': 'image/jpeg',
'.map': 'text/plain'
function charset(mimeType: string): string {
return ['.html', '.htm', '.js', '.mjs'].some(m => m === mimeType) ? 'utf-8' : null;
function mime(filename: string): string {
const type = mimeTypes[path.extname(`${filename || ''}`).toLowerCase()];
return type ? type : null;
export function requestHandler(req: Electron.HandlerRequest, next: ProtocolCallback) {
const reqUrl = new URL(req.url);
let reqPath = path.normalize(reqUrl.pathname);
if (reqPath === '/') {
reqPath = '/index.html';
const reqFilename = path.basename(reqPath);
fs.readFile(path.join(DIST_PATH, reqPath), (err, data) => {
const mimeType = mime(reqFilename);
if (!err && mimeType !== null) {
mimeType: mimeType,
charset: charset(mimeType),
data: data
} else {
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