codesnips

middleware

java 
package com.example.ratelimit;

public class TokenBucket {

    private final long capacity;
    private final long refillTokens;

Per-Client Token Bucket Rate Limiting with a Spring Boot HandlerInterceptor

spring-boot rate-limiting token-bucket
by codesnips 4 tabs
python 
import time
import threading
from collections import deque, defaultdict


class SlidingWindowLimiter:

Sliding-Window Rate Limiting in Flask With a Custom Decorator and In-Memory Buckets

flask rate-limiting decorators
by codesnips 3 tabs
javascript 
const sharp = require('sharp');

const DEFAULTS = {
  maxWidth: 1600,
  maxHeight: 1600,
  format: 'webp',

Resize and Compress Uploaded Images with Sharp Before Saving to Disk

nodejs express sharp
by codesnips 3 tabs
ruby 
class Current < ActiveSupport::CurrentAttributes
  attribute :user, :tenant, :request_id, :ip_address

  def user_display
    user&.email || "system"
  end

CurrentAttributes for Request-Scoped Context

rails activesupport currentattributes
by codesnips 4 tabs
ruby 
require "sinatra/base"
require "rack/utils"

class AdminApp < Sinatra::Base
  before do
    protected!

Protecting Namespaced Admin Routes in Sinatra with an HTTP Basic Auth before Filter

sinatra http-basic-auth authentication
by codesnips 3 tabs
lua 
-- KEYS[1] = current window key, KEYS[2] = previous window key
-- ARGV: limit, window_ms, elapsed_ms
local limit = tonumber(ARGV[1])
local window = tonumber(ARGV[2])
local elapsed = tonumber(ARGV[3])

Sliding-Window Rate Limiting for Express Routes Backed by Redis

express redis rate-limiting
by codesnips 4 tabs
ruby 
require 'sinatra/base'
require 'rack/protection'

class TransferApp < Sinatra::Base
  enable :sessions
  set :session_secret, ENV.fetch('SESSION_SECRET', 'a' * 64)

CSRF Protection for Sinatra Forms with Rack::Protection AuthenticityToken

sinatra rack csrf
by codesnips 3 tabs
python 
import contextvars
import uuid

_correlation_id: contextvars.ContextVar[str] = contextvars.ContextVar(
    "correlation_id", default="-"
)

Propagating a Correlation ID Through contextvars in FastAPI

fastapi contextvars middleware
by codesnips 4 tabs
python 
import asyncio
import time
from dataclasses import dataclass, field


@dataclass

Per-Client Rate Limiting in FastAPI with a Token Bucket Dependency

python fastapi rate-limiting
by codesnips 3 tabs
sql 
CREATE TABLE idempotency_keys (
    id              BIGSERIAL PRIMARY KEY,
    idempotency_key TEXT        NOT NULL,
    request_path    TEXT        NOT NULL,
    request_fingerprint TEXT    NOT NULL,
    status          TEXT        NOT NULL DEFAULT 'in_progress',

Idempotent POST Requests with an Idempotency-Key Middleware in Express

express idempotency middleware
by codesnips 3 tabs
python 
import json
import secrets
import time
from typing import Optional

import redis.asyncio as redis

Sliding-Window Session Token Expiry With FastAPI Middleware and Redis

fastapi redis sessions
by codesnips 3 tabs
typescript 
const rawOrigins = process.env.ALLOWED_ORIGINS ?? "";

export const allowedOrigins = new Set(
  rawOrigins
    .split(",")
    .map((o) => o.trim())

CORS configuration that’s explicit (no *)

security http express
by codesnips 3 tabs