#expiry code explainers

python

import base64
import hashlib
import hmac
import json

Building signed expiring tokens with HMAC

hmac authentication base64

Intermediate 7 steps

php

<?php
 
namespace App\Services;

Building signed, expiring download URLs in PHP in Laravel

hmac url-signing authentication

Intermediate 7 steps

ruby

class ProductCatalog
  def featured_products
    Rails.cache.fetch("catalog/featured_products", expires_in: 12.hours) do
      Product.where(featured: true)

Caching patterns with Rails.cache.fetch

caching cache-keys expiry

Intermediate 5 steps