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## protocol.md

      
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                Protocol between Frontend and Backend
              
          
    Protocol between Frontend and Backend


Frontend and Backend using the same key

Example:

key = 'cdbdb4ff58e66858cba67787312e2e324c4b217e48680d443a42d96496556834ab549f199b5081d2926e644398e6408ba9ed72d96b1119fc7d4474938ee7c0f7';


The signature that Frontend send to Backend have format:

"#{base64_encoded_timestamp}--#{sha256 hash}"


In Frontend

Using https://www.npmjs.com/package/crypto-js


## install.md

      
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                bill-mfv
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              July 14, 2022 06:29
            
              
                Install RoR env
              
          
    HomeBrew is a package manager for OSX. Brew install missing stuff so easy…


Install Homebrew:

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Change permission for zsh


Change the ownership of these directories to your user:

sudo chown -R $(whoami) /usr/local/share/zsh /usr/local/share/zsh/site-functions
And make sure that your user has write permission:

chmod u+w /usr/local/share/zsh /usr/local/share/zsh/site-functions


## refactor-code-using-module-example-1.md

      
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                bill-mfv
                / refactor-code-using-module-example-1.md
            
            
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              July 1, 2022 01:18
            
          
    Starting point: We build a feature that helps users unsubcribe the email subscription
Like:
URL: /user/unsubcribe_email/:token
We don't want to store the token in the database,
so we come with the approach that uses a dynamic token by encrypt_and_sign the user's ID with a key
Like:

  
## delete_rollbar_items.rb
require 'uri'
require 'net/http'
require 'openssl'

def get_occurrences_of_an_item read_token, item_id
  url = URI("https://api.rollbar.com/api/1/item/#{item_id}/instances")

  http = Net::HTTP.new(url.host, url.port)
  http.use_ssl = true
	require 'uri'
	require 'net/http'
	require 'openssl'

	def get_occurrences_of_an_item read_token, item_id
	url = URI("https://api.rollbar.com/api/1/item/#{item_id}/instances")

	http = Net::HTTP.new(url.host, url.port)
	http.use_ssl = true