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JWT Auth + Refresh Tokens in Rails

This is just some code I recently used in my development application in order to add token-based authentication for my api-only rails app. The api-client was to be consumed by a mobile application, so I needed an authentication solution that would keep the user logged in indefinetly and the only way to do this was either using refresh tokens or sliding sessions.

I also needed a way to both blacklist and whitelist tokens based on a unique identifier (jti)

Before trying it out DIY, I considered using:

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Default

Powerlevel10k

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Postgres Cheatsheet

This is a collection of the most common commands I run while administering Postgres databases. The variables shown between the open and closed tags, "<" and ">", should be replaced with a name you choose. Postgres has multiple shortcut functions, starting with a forward slash, "". Any SQL command that is not a shortcut, must end with a semicolon, ";". You can use the keyboard UP and DOWN keys to scroll the history of previous commands you've run.

Setup

installation, Ubuntu

http://www.postgresql.org/download/linux/ubuntu/ https://help.ubuntu.com/community/PostgreSQL

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Primitive Types & Reference Types in JavaScript

An explanation of JavaScript's pass-by-value, which is unlike pass-by-reference from other languages.

Facts

• JavaScript has 2 kinds of variable types: primitive and reference.
• A fixed amount of memory is reserved after creation of every variable.
• When a variable is copied, it's in-memory value is copied.
• Passing a variable to a function via a call also creates a copy of that variable.

Primitive Types

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Common Regular Expressions for Django URLs

A list of comman regular expressions for use in django url's regex.

Example Django URLs patterns:

urlpatterns = patterns('',

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#!/bin/bash

NAME="hello_app"                                  # Name of the application
DJANGODIR=/webapps/hello_django/hello             # Django project directory
SOCKFILE=/webapps/hello_django/run/gunicorn.sock  # we will communicte using this unix socket
USER=hello                                        # the user to run as
GROUP=webapps                                     # the group to run as
NUM_WORKERS=3                                     # how many worker processes should Gunicorn spawn
DJANGO_SETTINGS_MODULE=hello.settings             # which settings file should Django use
DJANGO_WSGI_MODULE=hello.wsgi                     # WSGI module name

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# Sample i2of5 barcode generation.
from reportlab.pdfgen import canvas
from reportlab.lib.pagesizes import A4
from reportlab.lib.units import mm
from reportlab.graphics.barcode.common import I2of5

c=canvas.Canvas("barcode_example.pdf",pagesize=A4)

tb=0.254320987654 * mm # thin bar
bh=20 * mm # bar height

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$("#action-button").click(function() {
    // supondo que voce tenha um <input id="pesquisar-nome"/>
    var inputValue = $("#pesquisar-nome").val();
		$.ajax({
			url: "/search_view/?pesquisar-nome=" + encodeURIComponent(inputValue),
			type: "get",
			success: function(data) {
				$('#results').html(data);
			}
		});

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<form id="contact-form" action="//formspree.io/your@email.com" method="post">
	<input type="text" name="Name" placeholder="Name" required>
	<input type="email" name="Email" placeholder="Email" required>
	<textarea name="Message" cols="30" rows="6" placeholder="Message" required></textarea>
	<!-- CONFIG -->
	<input class="hidden" type="text" name="_gotcha">
	<input type="hidden" name="_subject" value="Email Subject">
	<!-- /CONFIG -->
	<input class="submit" type="submit" value="Send message">
</form>