rswift’s gists

rswift / email-regex.txt

Last active September 13, 2023 08:54

an imperfect but simple email regex for CloudFormation AllowedPattern

	^\b([a-zA-Z0-9][\.\-_a-zA-Z0-9]+)\b@\b([a-zA-Z0-9][\-_a-zA-Z0-9]+)\b\.{1}\b(.*)\b$

	#
	# not massively well tested, or spectacular, but it works for generally agreeable, mostly typical [email protected] style addresses
	#

	#
	# passing
	#
	[email protected]

rswift / day_ordinal.py

Created August 19, 2022 09:13

Determine a day of the month ordinal...

	def day_ordinal(day: int) -> str:
	"""For a given day of the month, return its ordinal 📅"""
	if 4 <= day <= 20 or 24 <= day <= 30:
	return "th"
	else:
	return ["st", "nd", "rd"][day % 10 - 1]

	for day in range(1, 31+1):
	print(f"{day}{day_ordinal(day)}")

rswift / SNS ARN regex

Last active February 26, 2023 09:40

rswift / plural.py

Created October 9, 2021 12:33

simple plurals in python...

	#
	# hat tip: https://stackoverflow.com/users/173003/aristide via https://stackoverflow.com/a/65063284/259122
	#
	# shamelessly copied and included here for easier self-location!
	#
	for i in range(5):
	print(f"{i} bottle{'s'[:i^1]} of beer.")

rswift / window_size_info.html

Last active September 2, 2021 08:36

A trivial web page that can be loaded as file:///window_size_info.html to dynamically display the screen height and width, useful for making a window a specific size for screen grabs etc. without needing to add an extension to ones browser... Has this been Testing'd? In a word. No. It works fine on Firefox & Safari, not tried it with other brows…

	<!DOCTYPE html>
	<html lang="en-GB">
	<head>
	<title>🖖</title>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<!-- favicon idea stolen! https://twitter.com/LeaVerou/status/1241619866475474946 -->
	<link rel="icon" href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>📺</text></svg>">
	<style>
	html, body {

rswift / S3 ARN regex

Created July 29, 2021 11:36

	#
	# Specifically linked to eu-west-2 so tweak as necessary
	#
	arn:aws:s3:eu-west-2:\d{12}:(?=.{3,63}$)(?!(\d+\.)+\d+$)((([a-z0-9]\|[a-z0-9][a-z0-9\-][a-z0-9])\.)([a-z0-9]\|[a-z0-9][a-z0-9\-]*[a-z0-9])$)

	#
	# passing
	#
	arn:aws:s3:eu-west-2:123456789012:abc
	arn:aws:s3:eu-west-2:123456789012:abcd

rswift / lambda_function.py

Last active September 16, 2022 19:50

AWS Lambda function to log salient details then exit...

	import logging
	import os

	log_level = os.environ['LOG_LEVEL'] if 'LOG_LEVEL' in os.environ else 'INFO'
	logging_levels = {"DEBUG": logging.DEBUG, "INFO": logging.INFO, "WARNING": logging.WARNING, "ERROR": logging.ERROR, "CRITICAL": logging.CRITICAL} # https://docs.python.org/3/library/logging.html#levels
	logging_level = logging_levels[log_level] if log_level in logging_levels else logging.INFO

	logger = logging.getLogger()
	logger.setLevel(logging_level)

rswift / unkown_root_ca_tinkering.py

Last active October 10, 2023 13:20

Trivial script to explore only using built-in Python 3 modules to establish a connection to a host that issues certs signed by a CA that isn't well known...

	#
	# Trivial script to explore only using built-in Python 3 modules to establish a connection to
	# a host that issues certs signed by a CA that isn't well known...
	#
	# It does require that the root cert is available, so primarily an enterprise that has an
	# internal or private CA and signs server certs with that...
	#

	import urllib.request
	import ssl

	#
	# Specifically linked to eu-west-2 so tweak as necessary
	#
	^arn:aws:sns:eu-west-2:\d{12}:([\w\-]{1,256}\|[\w\-]{1,251}\.fifo)$

	#
	# passing
	#
	arn:aws:sns:eu-west-2:123456789012:MyTopic
	arn:aws:sns:eu-west-2:123456789012:mytopic

Robert Swift rswift