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0 · About the User and Your Role

The person you are assisting is User.
Assume User is an experienced senior backend/database engineer, familiar with mainstream languages and their ecosystems such as Rust, Go, and Python.
User values "Slow is Fast", focusing on: reasoning quality, abstraction and architecture, long-term maintainability, rather than short-term speed.
Your core objectives:
- As a strong reasoning, strong planning coding assistant, provide high-quality solutions and implementations in as few interactions as possible;
- Prioritize getting it right the first time, avoiding superficial answers and unnecessary clarifications.

People

`:bowtie:`	😄 `:smile:`	😆 `:laughing:`
😊 `:blush:`	😃 `:smiley:`	☺️ `:relaxed:`
😏 `:smirk:`	😍 `:heart_eyes:`	😘 `:kissing_heart:`
😚 `:kissing_closed_eyes:`	😳 `:flushed:`	😌 `:relieved:`
😆 `:satisfied:`	😁 `:grin:`	😉 `:wink:`
😜 `:stuck_out_tongue_winking_eye:`	😝 `:stuck_out_tongue_closed_eyes:`	😀 `:grinning:`
😗 `:kissing:`	😙 `:kissing_smiling_eyes:`	😛 `:stuck_out_tongue:`

Mounting VirtualBox shared folders on Ubuntu Server 18.04 LTS (Bionic Beaver)

This guide will walk you through the steps on how to setup a VirtualBox shared folder inside your Ubuntu Server guest.

Prerequisites

This guide assumes that you are using the following setup:

Oracle VM VirtualBox version 6.0.10 with Extension Pack installed
Microsoft Windows 7 SP1 as the host OS
A fresh install of Ubuntu Server 18.04.2 LTS as the guest OS

You could still make this guide work with other setups (possibly with some modifications to the commands and whatnot).

User-controlled Keys Considered Harmful

Two important takeaways from CVE-2025-55182

We now have a public POC for CVE-2025-55182, the React Server vulnerability that allows remote code execution on affected servers. The details of how the exploit works are fascinating, and they highlight a couple of important but obscure facts about JavaScript itself that all JS developers should be aware of so that we hopefully don't make the same mistakes in our own code.

1. Promises are overloaded

You may have heard that promises are not monads. This is because the then function is overloaded to act as both map and bind. For anyone without a functional programming background, here's a quick summary of what that means.

	esphome:
	name: atomberg

	esp32:
	board: esp32dev
	framework:
	type: arduino

	# Enable logging
	logger:

	"custom/weather": {
	"exec": "python ~/.config/waybar/scripts/weather.py",
	"restart-interval": 300,
	"return-type": "json",
	"on-click": "xdg-open https://weather.com/en-IN/weather/today/l/$(location_id)"
	// "format-alt": "{alt}",
	},

	POST / HTTP/1.1
	Host: localhost
	User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36
	Next-Action: x
	Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryx8jO2oVc6SWP3Sad
	Content-Length: 459

	------WebKitFormBoundaryx8jO2oVc6SWP3Sad
	Content-Disposition: form-data; name="0"

	{{ states.binary_sensor
	\| selectattr('attributes.device_class', 'in', ['door','window'])
	\| selectattr('state', 'equalto', 'on')
	\| list \| count }}

	alias: Holiday Train On every Hour
	description: ""
	trigger:
	- platform: time_pattern
	minutes: "0"
	seconds: "0"
	condition:
	- condition: time
	before: "22:30:00"
	after: "08:30:00"