Add puma, rubocop, Procfile

Gemfile

@@ -1,6 +1,15 @@
-source "https://rubygems.org"
+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+ruby '2.6.2'
 
-gem 'sinatra'
 gem 'oauth2'
 gem 'pry'
+gem 'puma'
 gem 'redcarpet'
+gem 'sinatra'
+
+group :development do
+  gem 'rubocop'
+end

Gemfile.lock

@@ -2,27 +2,44 @@ GEM
   remote: https://rubygems.org/
   specs:
     addressable (2.2.6)
+    ast (2.4.0)
     coderay (0.9.8)
     faraday (0.7.5)
       addressable (~> 2.2.6)
       multipart-post (~> 1.1.3)
       rack (>= 1.1.0, < 2)
+    jaro_winkler (1.5.2)
     method_source (0.6.7)
       ruby_parser (>= 2.3.1)
     multi_json (1.0.4)
     multipart-post (1.1.4)
     oauth2 (0.5.1)
       faraday (~> 0.7.4)
       multi_json (~> 1.0.3)
+    parallel (1.17.0)
+    parser (2.6.2.0)
+      ast (~> 2.4.0)
     pry (0.9.7.4)
       coderay (~> 0.9.8)
       method_source (~> 0.6.7)
       ruby_parser (>= 2.3.1)
       slop (~> 2.1.0)
+    psych (3.1.0)
+    puma (3.12.1)
     rack (1.6.11)
     rack-protection (1.5.5)
       rack
+    rainbow (3.0.0)
     redcarpet (3.4.0)
+    rubocop (0.66.0)
+      jaro_winkler (~> 1.5.1)
+      parallel (~> 1.10)
+      parser (>= 2.5, != 2.5.1.1)
+      psych (>= 3.1.0)
+      rainbow (>= 2.2.2, < 4.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 1.4.0, < 1.6)
+    ruby-progressbar (1.10.0)
     ruby_parser (3.12.0)
       sexp_processor (~> 4.9)
     sexp_processor (4.11.0)
@@ -32,15 +49,21 @@ GEM
       tilt (~> 1.3, >= 1.3.3)
     slop (2.1.0)
     tilt (1.3.3)
+    unicode-display_width (1.5.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   oauth2
   pry
+  puma
   redcarpet
+  rubocop
   sinatra
 
+RUBY VERSION
+   ruby 2.6.2p47
+
 BUNDLED WITH
-   1.17.1
+   1.17.2

Procfile

@@ -0,0 +1 @@
+web: bundle exec puma -t 5:5 -p ${PORT:-3000} -e ${RACK_ENV:-development}

config.ru

@@ -1,6 +1,6 @@
-require 'rubygems'
-require 'bundler'
+# frozen_string_literal: true
 
+require 'bundler/setup'
 Bundler.require
 
 require './doorkeeper_client'

doorkeeper_client.rb

@@ -1,8 +1,10 @@
-require "sinatra/base"
-require "./lib/html_renderer"
+# frozen_string_literal: true
+
+require 'sinatra/base'
+require './lib/html_renderer'
 
 # Load custom environment variables
-load 'env.rb' if File.exists?('env.rb')
+load 'env.rb' if File.exist?('env.rb')
 
 class DoorkeeperClient < Sinatra::Base
   enable :sessions
@@ -20,13 +22,13 @@ def signed_in?
     end
 
     def markdown(text)
-      options  = { :autolink => true, :space_after_headers => true, :fenced_code_blocks => true }
+      options  = { autolink: true, space_after_headers: true, fenced_code_blocks: true }
       markdown = Redcarpet::Markdown.new(HTMLRenderer, options)
       markdown.render(text)
     end
 
     def markdown_readme
-      markdown(File.read(File.join(File.dirname(__FILE__), "README.md")))
+      markdown(File.read(File.join(File.dirname(__FILE__), 'README.md')))
     end
 
     def site_host
@@ -38,13 +40,13 @@ def client(token_method = :post)
     OAuth2::Client.new(
       ENV['OAUTH2_CLIENT_ID'],
       ENV['OAUTH2_CLIENT_SECRET'],
-      :site         => ENV['SITE'] || "http://doorkeeper-provider.herokuapp.com",
-      :token_method => token_method,
+      site: ENV['SITE'] || 'http://doorkeeper-provider.herokuapp.com',
+      token_method: token_method
     )
   end
 
   def access_token
-    OAuth2::AccessToken.new(client, session[:access_token], :refresh_token => session[:refresh_token])
+    OAuth2::AccessToken.new(client, session[:access_token], refresh_token: session[:refresh_token])
   end
 
   def redirect_uri
@@ -56,8 +58,8 @@ def redirect_uri
   end
 
   get '/sign_in' do
-    scope = params[:scope] || "read"
-    redirect client.auth_code.authorize_url(:redirect_uri => redirect_uri, :scope => scope)
+    scope = params[:scope] || 'read'
+    redirect client.auth_code.authorize_url(redirect_uri: redirect_uri, scope: scope)
   end
 
   get '/sign_out' do
@@ -67,36 +69,35 @@ def redirect_uri
 
   get '/callback' do
     if params[:error]
-      erb :callback_error, :layout => !request.xhr?
+      erb :callback_error, layout: !request.xhr?
     else
-      new_token = client.auth_code.get_token(params[:code], :redirect_uri => redirect_uri)
+      new_token = client.auth_code.get_token(params[:code], redirect_uri: redirect_uri)
       session[:access_token]  = new_token.token
       session[:refresh_token] = new_token.refresh_token
       redirect '/'
     end
   end
 
   get '/refresh' do
-    begin
-      new_token = access_token.refresh!
-      session[:access_token]  = new_token.token
-      session[:refresh_token] = new_token.refresh_token
-      redirect '/'
-    rescue OAuth2::Error => @error
-      erb :error, :layout => !request.xhr?
-    rescue StandardError => @error
-      erb :error, :layout => !request.xhr?
-    end
-end
+    new_token = access_token.refresh!
+    session[:access_token]  = new_token.token
+    session[:refresh_token] = new_token.refresh_token
+    redirect '/'
+  rescue OAuth2::Error => @error
+    erb :error, layout: !request.xhr?
+  rescue StandardError => @error
+    erb :error, layout: !request.xhr?
+  end
 
   get '/explore/:api' do
-    raise "Please call a valid endpoint" unless params[:api]
+    raise 'Please call a valid endpoint' unless params[:api]
+
     begin
       response = access_token.get("/api/v1/#{params[:api]}")
       @json = JSON.parse(response.body)
-      erb :explore, :layout => !request.xhr?
+      erb :explore, layout: !request.xhr?
     rescue OAuth2::Error => @error
-      erb :error, :layout => !request.xhr?
+      erb :error, layout: !request.xhr?
     end
   end
 end

lib/html_renderer.rb

@@ -1,7 +1,9 @@
+# frozen_string_literal: true
+
 class HTMLRenderer < Redcarpet::Render::HTML
   def header(text, header_level)
     tag = "h#{header_level}"
     text_as_id = text.downcase.gsub(/[^a-z0-9\-_]+/i, '-')
-    %Q{<#{tag} id="#{text_as_id}">#{text}</#{tag}>}
+    %(<#{tag} id="#{text_as_id}">#{text}</#{tag}>)
   end
 end