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What is this?

timer based skill analysis challenge

A sample rails app written in under 1 hour. :)

  • REST API
  • JSON payload
  • Tokenized authentication via API
  • Admin & users
  • Admin authenticates with email and password
  • Users authenticate with an ATM card and PIN
  • Withdrawal limit of 20,000 (conditional logic on API)
  • ATM always keeps the balance updated
  • Card number cam only be 8 characters
  • PIN can only be 4 characters
  • API: Deposit into ATM (after authentication)
  • API: Withdraw from ATM (after authentication)
  • API: Fetch balance in ATM (Count of currency notes and their denominations)

How to deploy?

You should have ruby, bundler gem installed

git clone https://github.com/ramonrails/ramonrails-rest-json-auth-atm-demo
cd ramonrails-rest-json-auth-atm-demo
bundle install
rails db:create db:migrate
rails server

you have a rails server running with REST API, to accept commands with JSON payload now open another terminal to run the following commands

Rails console

create admin with email and password

User.create!(email: '[email protected]' , password: 'changeme123' , password_confirmation: 'changeme123', isadmin: true)

create user with card and pin

User.create!(email: '[email protected]' , card: 'card1234' , pin: '1234')

authenticate using REST API with JSON payload example result: {"auth_token":"eyJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjoxLCJleHAiOjE1NzY4Njk3MzZ9.u9n-b_GKonsd-htsk12bTf8eamJVxGvAjCdhoXmnTvI"}

terminal / console (shell prompt)

get admin token

example: eyJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjo1LCJleHAiOjE1NzY4NzIyNzh9.T0jaBIk2bzRN4q5quBowbD-pPLlJ7hJ_6lSbgiU_LCE

curl -H "Content-Type: application/json" -X POST -d '{"email":"[email protected]","password":"changeme123"}' http://localhost:3000/authenticate

get user token

example: eyJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjo1LCJleHAiOjE1NzY4NzIxMzV9.mu6MHYzjtr-S2qSVHnlmyeOchIwc-6HNKSn58z3RG20

curl -H "Content-Type: application/json" -X POST -d '{"card":"card1234", "pin":"1234"}' http://localhost:3000/authenticate

fetch teller list (not authorised)

curl http://localhost:3000/tellers

fetch with auth token - user

curl -H "Authorization: eyJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjo1LCJleHAiOjE1NzY4NzIxMzV9.mu6MHYzjtr-S2qSVHnlmyeOchIwc-6HNKSn58z3RG20" http://localhost:3000/tellers

fetch with auth token - admin

curl -H "Authorization: eyJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjo1LCJleHAiOjE1NzY4NzIyNzh9.T0jaBIk2bzRN4q5quBowbD-pPLlJ7hJ_6lSbgiU_LCE" http://localhost:3000/tellers

deposit

curl -H "Authorization: eyJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjo1LCJleHAiOjE1NzY4NzIxMzV9.mu6MHYzjtr-S2qSVHnlmyeOchIwc-6HNKSn58z3RG20" -H "Content-Type: application/json" -X POST -d '{"denomination":"2000","notes":"20"}' http://localhost:3000/tellers

withdrawal

curl -H "Authorization: eyJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjo1LCJleHAiOjE1NzY4NzIxMzV9.mu6MHYzjtr-S2qSVHnlmyeOchIwc-6HNKSn58z3RG20" -H "Content-Type: application/json" -X POST -d '{"denomination":"2000","notes":"-10"}' http://localhost:3000/tellers

fetch balance (only admin)

curl -H "Authorization: eyJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjo1LCJleHAiOjE1NzY4NzIyNzh9.T0jaBIk2bzRN4q5quBowbD-pPLlJ7hJ_6lSbgiU_LCE" http://localhost:3000/tellers

what about some headers?

This is curl/REST/API. Just add them in the command/URL

-H "access-control-allow-headers: Origin, X-Requested-With, Content-Type, Accept"
-H "access-control-allow-methods: GET, POST, PUT"
-H "access-control-allow-origin:*"
-H "server: cloudflare-nginx"