Wan Zulkarnain wzul

Setting up email with SMTP on Ubuntu/Debian Servers

I used to sift trough my shell history and bookmarks every time I set up a new testing server in order to be able to send mails. So this should help...

Be aware don't use ssmtp anymore. It's unmaintained and has been removed from Debian and Ubuntu will most definitely follow suit.

Install msmtp

Use Proxy for Git/GitHub

Generally, the Git proxy configuration depends on the Git Server Protocol you use. And there're two common protocols: SSH and HTTP/HTTPS. Both require a proxy setup already. In the following, I assume a SOCKS5 proxy set up on localhost:1080. But it can also be a HTTP proxy. I'll talk about how to set up a SOCKS5 proxy later.

SSH Protocol

When you do git clone ssh://[user@]server/project.git or git clone [user@]server:project.git, you're using the SSH protocol. You need to configurate your SSH client to use a proxy. Add the following to your SSH config file, say ~/.ssh/config:

ProxyCommand nc -x localhost:1080 %h %p

Optimistic Locking assumes that a database transaction conflict is very rare to happen. It uses a version number of the record to track the changes. It raise an error when other user tries to update the record while it is lock.

usage

Just add a lock_version column to the table you want to place the lock and Rails will automatically check this column before updating the record.

Pessimistic locking assumes that database transaction conflict is very likely to happen. It locks the record until the transaction is done. If the record is currently lock and the other user make a transaction, that second transaction will wait until the lock in first transaction is release.

usage

	async (event, steps) => {
	// NodeJS implementation in Pipedream of "Intent to Receive" for Xero webhooks

	const { createHmac } = await import('crypto');
	const xero_webhook_key = 'OSd0eLlVIY9ZhViEqlDUh4+6n6M+Lo+eDaEJheJ6OCCgWwIz2D3JIAU6jPMipHRbgKTLz2uJ+xiACXGDBLrgdA==' // Get this from the Xero app
	const body_string = Buffer.from(steps.trigger.raw_event.body_b64, 'base64').toString() // Use RAW body data so that Pipedream doesn't break our data
	const xero_hash = steps.trigger.event.headers["x-xero-signature"] // Could probably shorten, but keeping it long for consistency

	let our_hash = createHmac('sha256', xero_webhook_key).update(body_string).digest("base64") // Generate the hash Xero wants
	let statusCode = xero_hash == our_hash ? 200 : 401 // If the hashes match, send a 200, else send a 401

	#!/usr/bin/env bash

	rm -rf .git

	git init
	git add .
	git commit -m "Initial commit"

	git remote add origin <git origin url>
	git push -u --force origin <branch>

	import requests
	import json
	import base64
	from flask import Flask,redirect

	app = Flask(__name__)

	@app.route('/')
	def _init_():
	api_key = '70eaae3d-39fd-408a-9b06-0580e588f3dfe'

	function round(value, precision, mode) {
	var m, f, isHalf, sgn;
	precision \|= 0;
	m = Math.pow(10, precision);
	value *= m;
	sgn = (value > 0) \| -(value < 0);
	isHalf = value % 1 === 0.5 * sgn;
	f = Math.floor(value);

	if ( isHalf ) {

	<?php
	function buildSourceString($data, $prefix = '')
	{
	uksort($data, function($a, $b) {
	$a_len = strlen($a);
	$b_len = strlen($b);

	$result = strncasecmp($a, $b, min($a_len, $b_len));

	if ($result === 0) {

	ActiveAdmin.register App do
	ActionController::Parameters.permit_all_parameters = true
	menu priority: 6, label: "Uygulamalar"

	index do
	selectable_column
	excluded = ["app_image","updated_at","domain_id"]
	(App.column_names - excluded).each do \|c\|
	column c.to_sym
	end

	<?php
	function require_auth() {
	$AUTH_USER = 'admin';
	$AUTH_PASS = 'admin';
	header('Cache-Control: no-cache, must-revalidate, max-age=0');
	$has_supplied_credentials = !(empty($_SERVER['PHP_AUTH_USER']) && empty($_SERVER['PHP_AUTH_PW']));
	$is_not_authenticated = (
	!$has_supplied_credentials \|\|
	$_SERVER['PHP_AUTH_USER'] != $AUTH_USER \|\|
	$_SERVER['PHP_AUTH_PW'] != $AUTH_PASS