Thach Chau thachck

Methods of Signing with GPG

Last updated March 28, 2021

There are now two ways to approach this:

Using gpg and generating keys
Using Kryptonite by krypt.co

This Gist explains how to do this using gpg in a step-by-step fashion. Kryptonite is actually wickedly easy to use-but you will still need to follow the instructions

Upload a file with $.ajax to AWS S3 with a pre-signed url

When you read about how to create and consume a pre-signed url on this guide, everything is really easy. You get your Postman and it works like a charm in the first run.

Then you open your browser, try your usual $.ajax() and send your PUT operation, and you hit the cold iced wall of AWS error message, a simple <Code>SignatureDoesNotMatch</Code> that will steal hours from your productivity.

So here I come to save you and give you a free working example of how to upload a file directly to AWS S3 from your browser. You are wellcome :).

My theory is that folks are hallucinating complex structure for these docs. If you read the Cursor forums, people are asking the Cursor LLM how to format them 🙃 Those shared above are the results of writing in the UI and what gets puts into version control.

My approach is that when I am annoyed by something I have to manually fix up, I go update the file.

Some of it is just impossible, like using the new Strong Params expects syntax given the training cutoffs. I’m not going to completely document the interface (cursor/rules can’t link to docs and can only link to a single file) . So I hint it, and it simply hallucinates the interface mostly correctly most of the time. Principle of Least Surprise in practice!

My .cursorrules were pretty inconsistent project to project, and I don’t believe that putting very generic things like “Use exceptions for exceptional cases, not for control flow” or “Use Active Record effectively” improves things.

Coding Rules and Instructions

Test-Driven Development (TDD) with pytest: Always write a failing test before writing implementation code (Red-Green-Refactor). Use pytest and pytest-fixtures for test setup, execution, and teardown.
KISS (Keep It Simple, Stupid): Favor the simplest solution that meets the requirements.
DRY (Don't Repeat Yourself): Avoid code duplication. Extract reusable logic into functions or classes.
Standard Libraries and Tools: Utilize standard Python libraries (like datetime for date/time, requests for HTTP requests, and logging) and external libraries, including BeautifulSoup4 for HTML parsing, to avoid reinventing the wheel. Favor well-maintained and widely-used libraries.
YAGNI (You Ain't Gonna Need It): Don't implement features or functionality unless they are currently required.
SOLID Principles & Extensibility: Adhere to SOLID principles, promoting maintainability, testability, and future extension. Consider potential future requi

Mac-to-Mac Remote Shell Stack (Tailscale + SSH + Mosh + tmux) — Low-Lag, High-Reliability Setup

This gist documents a reproducible setup for a “remote shell that feels local” between a laptop and one or more headless Macs (e.g., Mac minis). It is optimized for:

High latency / packet loss links (SSH typing lag, key repeats, “rubber band” echo)
Roaming networks (Wi-Fi drops, IP changes)
Long-lived sessions (detach/reattach, crash tolerance)

Core design decisions:

Tailscale provides a private, encrypted, stable network plane (no port forwarding/NAT complexity).
OpenSSH (Remote Login) is used for authentication, key management, and compatibility.

	set ignorecase
	set smartcase
	set scrolloff=3 " 3 lines above/below cursor when scrolling

	" Emulated Plugins
	set surround

	" Copy to system clipboard as well
	set clipboard+=unnamed

	-server
	-Xms2048m
	-Xmx2048m
	-XX:NewSize=512m
	-XX:MaxNewSize=512m
	-XX:PermSize=512m
	-XX:MaxPermSize=512m
	-XX:+UseParNewGC
	-XX:ParallelGCThreads=4
	-XX:MaxTenuringThreshold=1

	[nodejs]
	disabled = true
	[ruby]
	disabled = true
	[git_branch]
	symbol = ''
	format = "[$branch]($style) "
	style = 'dimmed yellow'
	[git_status]
	disabled = true

	/*
	* Handling Errors using async/await
	* Has to be used inside an async function
	*/
	try {
	const response = await axios.get('https://your.site/api/v1/bla/ble/bli');
	// Success 🎉
	console.log(response);
	} catch (error) {
	// Error 😨

	#!/usr/bin/env python3

	"""
	You will need to install the pycryptodome package.
	You can do it with:
	pip3 install pycryptodome

	Note: To install pip3, run the following command
	sudo apt install python3-pip
	"""