Created
June 15, 2016 15:34
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Dummy backend for credit card form UI/UX exercise
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| # myapp.rb | |
| require 'sinatra' | |
| require 'json' | |
| require_relative 'payment' | |
| get '/' do | |
| erb :index | |
| end | |
| post '/' do | |
| request.body.rewind | |
| payment = Payment.create(request.body) | |
| [payment.status, payment.to_json] | |
| end | |
| __END__ | |
| @@ layout | |
| <html> | |
| <body> | |
| <%= yield %> | |
| @@ index | |
| <h1>Payments API:</h1> | |
| <h2>GET '/'</h2> | |
| <p> this page </p> | |
| <h2>POST '/'</h2> | |
| <h3>request:</h3> | |
| <b>body:</b> | |
| <tt> { "card": "1234567812345678","cvc": 123, "month": 1, "year": 2099, "cents": 500 } </tt> | |
| <h3>response</h3> | |
| <ul> | |
| <li> | |
| <b>success:</b> | |
| <p>status: <tt>200</tt> </p> | |
| <p>body: <tt>{ "id": "", "card": "1234567812345678", "cvc": 123, "month": 1, "year": 2099, "cents": 500, "errors": [] }</tt></p> | |
| </li> | |
| <li><b>failure:</b> | |
| <p>status: <tt>422</tt></p> | |
| <p>body: | |
| <tt>{"id":null,"card":"4242424242424242","cvc":"123","month":"1","year":"2016", "cents": 500,"errors":{"date":"card is expired"}} </tt> | |
| </p> | |
| </li> | |
| </ul> |
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| source 'https://rubygems.org' | |
| ruby '2.3.0' | |
| gem 'sinatra' |
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| require 'json' | |
| Payment = Struct.new(:card, :cvc, :month, :year, :cents) do | |
| class << self | |
| def create(datum) | |
| new(datum) | |
| end | |
| end | |
| attr_reader :data, :errors, :id | |
| def initialize(json = '') | |
| @data = JSON.load(json) || {} | |
| %w(card cents cvc month year).each { |k| send("#{k}=", @data[k]) } | |
| id | |
| end | |
| def id | |
| @id ||= valid? ? Time.now.strftime("%Y%m%d%k%M%S%L") : nil | |
| end | |
| def status | |
| valid? ? 200 : 422 | |
| end | |
| def to_json | |
| JSON.dump(id: id, | |
| card: card, | |
| cvc: cvc, | |
| month: month, | |
| year: year, | |
| cents: cents, | |
| errors: errors) | |
| end | |
| private | |
| ERRORS = { | |
| data: 'wrong data format', | |
| cvc: 'must be a 3 digit number', | |
| card: 'card is invalid', | |
| date: 'card is expired', | |
| cents: 'must be a positive integer' | |
| }.freeze | |
| def valid? | |
| validate | |
| errors.empty? | |
| end | |
| def validate | |
| error?(:data) { |d| d.is_a?(Hash) } | |
| error?(:data) { |d| d.keys.sort == %w(card cents cvc month year) } | |
| error?(:card) { |d| d =~ /\d{16}/ } | |
| error?(:cvc) { |d| d =~ /\d{3}/ } | |
| error?(:date) { |d| future?(d[:month].to_i, d[:year].to_i) } | |
| error?(:cents) { |c| c.is_a?(Integer) && c > 0 } | |
| end | |
| def date | |
| { month: month, year: year } | |
| end | |
| def error?(key) | |
| value = send(key) | |
| errors.merge!(key =>ERRORS[key]) unless yield(value) | |
| end | |
| def errors | |
| @errors ||= {} | |
| end | |
| def future?(month, year) | |
| today = Date.today | |
| (year > today.year || year == today.year && month > today.month) | |
| end | |
| end |
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