A JavaScript reverse CSS selector

In plain Javascript, you can get a reference to a particular HTML element by using the querySelector method. For example: document.querySelector('div') Will give you a reference to the first "div" that's encountered in the page. Give it a try in DevTools Sample querySelector What if we want to do the reverse? That is, given an … Continue reading A JavaScript reverse CSS selector

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Spring Data JPA: Emitting events on save() – Kotlin Edition

kotlin and spring boot

Scenario In a nutshell, we'd like to emit an event or take some custom action whenever a Spring Data JPA repository gets it's "save(...)" method called. Our criteria is to have minimal constraints set on other developers using this. In other words, we wouldn't like a solution where we create a new method or change … Continue reading Spring Data JPA: Emitting events on save() – Kotlin Edition

Living without React Router

How do you handle the scenario when a user taps the "back button" in your ReactJS app? In a plain vanilla ReactJS app you'll end up with the user navigating off your app since it's a SPA. Most devs would tell you to use React-Router. What if you can't, or - how does React-Router work? … Continue reading Living without React Router

3 uses for random decision trees / forests you (maybe) didn’t know about

Decision tree forests rightly get a lot of attention due to their robust nature, support for high dimensions and easy decipherability. The most well known uses of decision tree forests are: Classification - given a set of samples with certain features, classify the samples into discrete classes which the model has been trained on. Regression … Continue reading 3 uses for random decision trees / forests you (maybe) didn’t know about

Adding tile caching to maps in React-Leaflet

While writing a toy project that heavily relies on maps, I chose Leaflet as the map rendering library. From their site: Leaflet is the leading open-source JavaScript library for mobile-friendly interactive maps. Weighing just about 38 KB of JS, it has all the mapping features most developers ever need. The ease of use and ability to use different tile … Continue reading Adding tile caching to maps in React-Leaflet

Encrypting traffic in transit to Apache NiFi

In this article we'll explain how to encrypt traffic going to an HTTP handler in NiFi, which is then forwarded to a backend HTTP server - in other words, an SSL offloading reverse proxy. Encrypting traffic in transit to NiFi involves the following steps: Creating a keystore containing a CA certificateCreating a truststore, which contains … Continue reading Encrypting traffic in transit to Apache NiFi

Monitoring DNS requests with PowerShell

@CyberSift we're big fans of monitoring DNS. While there are malware campaigns out there which communicate directly with hard coded IP addresses, monitoring DNS is a good strategy for keeping tabs on what's going on in your environment. When it comes to monitoring windows hosts, Sysmon is an absolute must. There's tons of information out … Continue reading Monitoring DNS requests with PowerShell