Frozen global object

If your app uses global object as a config, you should make sure, that this object is truly readonly. So that an attacker can not modify it in dev console. This is how to do it. // example of frozen global object // freeze the config object properties const config = Object.freeze({ httpApi: ‘http://127.0.0.1:20003/v1’, wsApi: ‘ws://127.0.0.1:3000’, enableReduxDevTools: true, minLegalAge: 18 // in years }); // make sure that the config object can not be replaced Object.defineProperty(window, “config”, { value: config, configurable: false, writable: false }); PS: I assume that “window” is sufficient as a global object. If your app runs …

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Custom command line shortcuts with Doskey

I’ve learned this nice trick from Petr Horáček aka Besir while working on Nakamotox. So the credit goes to him. You can define custom commands via doskey (only on Windows) and then invoke them via command line. It is quite powerfull, because you can define alias for command with predefined attributes, so it save you lot of repetitive typing. Steps: Open any text editor and define your shortcut commands @echo off REM example shortcut for docker-compose doskey dcdu=docker-compose -f docker-compose-dev.yml up doskey dcdd=docker-compose -f docker-compose-dev.yml down Add path to file with commands to registry: open regedit go to \HKEY_CURRENT_USER\Software\Microsoft\Command Processor define AutoRun enter path to …

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Email validator for Angular

Angular has built in email validator, but it is very benevolent one. It allows for single letter domains, therefore email a@b is considered valid. Their motivation is that when used in intranet it can be perfectly valid email, because you can have custom domain names. But it does not make much sense in the broader internet. I would prefer if the built in validator would be stricter, or that there would be two validators, something like emailValidator and intranetEmailValidator. Here is my solution, hope it will help someone import {FormControl} from ‘@angular/forms’; // copied from http://emailregex.com/ export const emailRegexp = /^(([^<>()\[\]\\.,;:\s@”]+(\.[^<>()\[\]\\.,;:\s@”]+)*)|(“.+”))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/; …

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Recover deleted files by VisualStudio

Image this: You are working on a new functionality. You open up your IDE and start hacking away. You create several new files, invest your time and effort and then you accidentally delete the wrong file. No problem, that’s what we have Git for, right? But you forgot to add that now deleted file to version control. Aaarrrrggh. There is no way to retrieve that lost file. Bad, bad stupid little programmer. There is one little hack to save you (if you are in Windows): Locate the folder of deleted file and press Ctrl-Z. That will undo your deletion. It …

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