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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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Rails patterns

Patterns

Decorator: Usado em views.

Helpers: Usado em controllers (São comportilhados com toda a aplicação).

Serializers: Retorna a instância serializada em JSON.

Concerns: Reutilização de models e controllers entre múltiplos domínios.

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import React, { Component } from 'react'

import {
  View,
  AsyncStorage,
  TouchableHighlight,
  Text,
  StyleSheet,
} from 'react-native'

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<ScrollView
  horizontal={true}
  pagingEnabled={true}>

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<Text style={{
  padding: 20,
  fontSize: 16,
  backgroundColor: 'red',
}}>

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import {
  Text,
  ScrollView,
} from 'react-native';

class Carousel extends Component {
  render() {
    return (
      <ScrollView>
        <Text>Lorem ipsum...</Text>

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import {
  Text,
  View,
  ListView,
  ScrollView,
  Image,
  // . . .
} from 'react-native';