hdchinh hdchinh

hi, i'm daniel. i'm a 15-year-old high school junior. in my free time, i hack billion dollar companies and build cool stuff.

3 months ago, I discovered a unique 0-click deanonymization attack that allows an attacker to grab the location of any target within a 250 mile radius. With a vulnerable app installed on a target's phone (or as a background application on their laptop), an attacker can send a malicious payload and deanonymize you within seconds--and you wouldn't even know.

I'm publishing this writeup and research as a warning, especially for journalists, activists, and hackers, about this type of undetectable attack. Hundreds of applications are vulnerable, including some of the most popular apps in the world: Signal, Discord, Twitter/X, and others. Here's how it works:

Cloudflare

By the numbers, Cloudflare is easily the most popular CDN on the market. It beats out competitors such as Sucuri, Amazon CloudFront, Akamai, and Fastly. In 2019, a major Cloudflare outage k

Translated from https://blog.isquaredsoftware.com/2020/05/blogged-answers-a-mostly-complete-guide-to-react-rendering-behavior/, author: Mark Erikson (from Redux team)

A (Mostly) Complete Guide to React Rendering Behavior

Bài viết cung cấp chi tiết về cách mà React render hoạt động, và việc sử dụng Context và Redux ảnh hưởng thế nào tới quá trình render của React.

"Render" là gì

Rendering is the process of React asking your components to describe what they want their section of the UI to look like, now, based on the current combination of props and state.

Copy content of original credentials rails credentials:show somewhere temporarily.
Remove config/master.key and config/credentials.yml.enc
Run EDITOR=vim rails credentials:edit in the terminal: This command will create a new master.key and credentials.yml.enc if they do not exist.
Paste the original credentials you copied (step 1) in the new credentials file (and save + quit vim)
Add and Commit the file config/credentials.yml.enc

Alex Curtis created react-treebeard a data driven tree view for React. I needed to enable users to filter the tree's nodes based on input text. To accomplish this I transform the tree's data using 2 functions when the filter changes and rerender the view:

filterTree Given a tree return a new tree keeping only the nodes that meet one of the following conditions:
1. Has matching text
2. Has a parent with matching text
3. Has a child with matching text
expandNodesWithMatchingDescendants - Given a tree mark all the nodes with matching descendants as toggled

Here are the aformentioned functions.

	class AppleSignInController < ApplicationController
	APPLE_PEM_URL = "https://appleid.apple.com/auth/keys"

	# /api/apple/validate
	def validate

	name = params[:name]
	userIdentity = params[:userIdentity]
	jwt = params[:jwt]

	require 'socket'
	require 'rack'
	require 'rack/lobster'

	app = Rack::Lobster.new
	server = TCPServer.new 5678

	while session = server.accept
	request = session.gets
	puts request

	["Africa/Algiers", "West Central Africa"],
	["Africa/Cairo", "Cairo"],
	["Africa/Casablanca", "Casablanca"],
	["Africa/Harare", "Harare"],
	["Africa/Johannesburg", "Pretoria"],
	["Africa/Monrovia", "Monrovia"],
	["Africa/Nairobi", "Nairobi"],
	["America/Argentina/Buenos_Aires", "Buenos Aires"],
	["America/Bogota", "Bogota"],
	["America/Caracas", "Caracas"],

	# RSpec matcher for validates_with.
	# https://gist.github.com/2032846
	# Usage:
	#
	# describe User do
	# it { should validate_with CustomValidator }
	# end
	RSpec::Matchers.define :validate_with do \|expected_validator, options\|
	match do \|subject\|
	@validator = subject.class.validators.find do \|validator\|

	1. Gemfile

	gem 'ckeditor', github: 'galetahub/ckeditor'

	2. bundle install

	3. app/assets/javascripts/application.js
	//= require ckeditor/init

	4. config/initializers/active_admin.rb

hdchinh hdchinh

Cloudflare

A (Mostly) Complete Guide to React Rendering Behavior

"Render" là gì

Table of Contents

set -e, -u, -x, -o pipefail