Add assignment backend

Author: ionutzp

Dockerfile

@@ -0,0 +1,8 @@
+FROM ruby:2.3.3
+RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs
+RUN mkdir /myapp
+WORKDIR /myapp
+COPY Gemfile /myapp/Gemfile
+COPY Gemfile.lock /myapp/Gemfile.lock
+RUN bundle install
+COPY . /myapp

Gemfile

@@ -0,0 +1,37 @@
+source 'https://rubygems.org'
+
+
+# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
+gem 'rails', '~> 5.0.0', '>= 5.0.0.1'
+# Use postgresql as the database for Active Record
+gem 'pg', '~> 0.18'
+# Use Puma as the app server
+gem 'puma', '~> 3.0'
+# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
+# gem 'jbuilder', '~> 2.5'
+# Use Redis adapter to run Action Cable in production
+# gem 'redis', '~> 3.0'
+# Use ActiveModel has_secure_password
+gem 'bcrypt', '~> 3.1.7'
+gem 'jwt'
+
+# Use Capistrano for deployment
+# gem 'capistrano-rails', group: :development
+
+# Use Rack CORS for handling Cross-Origin Resource Sharing (CORS), making cross-origin AJAX possible
+gem 'rack-cors'
+
+group :development, :test do
+  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
+  gem 'byebug', platform: :mri
+end
+
+group :development do
+  gem 'listen', '~> 3.0.5'
+  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
+  gem 'spring'
+  gem 'spring-watcher-listen', '~> 2.0.0'
+end
+
+# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
+gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

Gemfile.lock

@@ -0,0 +1,139 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    actioncable (5.0.0.1)
+      actionpack (= 5.0.0.1)
+      nio4r (~> 1.2)
+      websocket-driver (~> 0.6.1)
+    actionmailer (5.0.0.1)
+      actionpack (= 5.0.0.1)
+      actionview (= 5.0.0.1)
+      activejob (= 5.0.0.1)
+      mail (~> 2.5, >= 2.5.4)
+      rails-dom-testing (~> 2.0)
+    actionpack (5.0.0.1)
+      actionview (= 5.0.0.1)
+      activesupport (= 5.0.0.1)
+      rack (~> 2.0)
+      rack-test (~> 0.6.3)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.0.2)
+    actionview (5.0.0.1)
+      activesupport (= 5.0.0.1)
+      builder (~> 3.1)
+      erubis (~> 2.7.0)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.0.2)
+    activejob (5.0.0.1)
+      activesupport (= 5.0.0.1)
+      globalid (>= 0.3.6)
+    activemodel (5.0.0.1)
+      activesupport (= 5.0.0.1)
+    activerecord (5.0.0.1)
+      activemodel (= 5.0.0.1)
+      activesupport (= 5.0.0.1)
+      arel (~> 7.0)
+    activesupport (5.0.0.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (~> 0.7)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+    arel (7.1.4)
+    bcrypt (3.1.11)
+    builder (3.2.3)
+    byebug (9.1.0)
+    concurrent-ruby (1.0.5)
+    crass (1.0.3)
+    erubis (2.7.0)
+    ffi (1.9.18)
+    globalid (0.4.1)
+      activesupport (>= 4.2.0)
+    i18n (0.9.1)
+      concurrent-ruby (~> 1.0)
+    jwt (2.1.0)
+    listen (3.0.8)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    loofah (2.1.1)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.5.9)
+    mail (2.7.0)
+      mini_mime (>= 0.1.1)
+    method_source (0.9.0)
+    mini_mime (1.0.0)
+    mini_portile2 (2.3.0)
+    minitest (5.10.3)
+    nio4r (1.2.1)
+    nokogiri (1.8.1)
+      mini_portile2 (~> 2.3.0)
+    pg (0.21.0)
+    puma (3.11.0)
+    rack (2.0.3)
+    rack-cors (1.0.2)
+    rack-test (0.6.3)
+      rack (>= 1.0)
+    rails (5.0.0.1)
+      actioncable (= 5.0.0.1)
+      actionmailer (= 5.0.0.1)
+      actionpack (= 5.0.0.1)
+      actionview (= 5.0.0.1)
+      activejob (= 5.0.0.1)
+      activemodel (= 5.0.0.1)
+      activerecord (= 5.0.0.1)
+      activesupport (= 5.0.0.1)
+      bundler (>= 1.3.0, < 2.0)
+      railties (= 5.0.0.1)
+      sprockets-rails (>= 2.0.0)
+    rails-dom-testing (2.0.3)
+      activesupport (>= 4.2.0)
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.0.3)
+      loofah (~> 2.0)
+    railties (5.0.0.1)
+      actionpack (= 5.0.0.1)
+      activesupport (= 5.0.0.1)
+      method_source
+      rake (>= 0.8.7)
+      thor (>= 0.18.1, < 2.0)
+    rake (12.3.0)
+    rb-fsevent (0.10.2)
+    rb-inotify (0.9.10)
+      ffi (>= 0.5.0, < 2)
+    spring (2.0.2)
+      activesupport (>= 4.2)
+    spring-watcher-listen (2.0.1)
+      listen (>= 2.7, < 4.0)
+      spring (>= 1.2, < 3.0)
+    sprockets (3.7.1)
+      concurrent-ruby (~> 1.0)
+      rack (> 1, < 3)
+    sprockets-rails (3.2.1)
+      actionpack (>= 4.0)
+      activesupport (>= 4.0)
+      sprockets (>= 3.0.0)
+    thor (0.20.0)
+    thread_safe (0.3.6)
+    tzinfo (1.2.4)
+      thread_safe (~> 0.1)
+    websocket-driver (0.6.5)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.3)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  bcrypt (~> 3.1.7)
+  byebug
+  jwt
+  listen (~> 3.0.5)
+  pg (~> 0.18)
+  puma (~> 3.0)
+  rack-cors
+  rails (~> 5.0.0, >= 5.0.0.1)
+  spring
+  spring-watcher-listen (~> 2.0.0)
+  tzinfo-data
+
+BUNDLED WITH
+   1.14.6

Rakefile

@@ -0,0 +1,6 @@
+# Add your own tasks in files placed in lib/tasks ending in .rake,
+# for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
+
+require_relative 'config/application'
+
+Rails.application.load_tasks

app/auth/authenticate_user.rb

@@ -0,0 +1,20 @@
+class AuthenticateUser
+  def initialize(email, password)
+    @email = email
+    @password = password
+  end
+
+  def call
+    JsonWebToken.encode(user_id: user.id) if user
+  end
+
+  private
+
+  attr_reader :email, :password
+
+  def user
+    user = User.find_by(email: email)
+    return user if user && user.authenticate(password)
+    raise(ExceptionHandler::InvalidToken, 'Invalid credentials')
+  end
+end

app/auth/authorize_api_request.rb

@@ -0,0 +1,28 @@
+class AuthorizeApiRequest
+  def initialize(headers = {})
+    @headers = headers
+  end
+
+  def call
+    {
+      user: user
+    }
+  end
+
+  private
+
+  attr_reader :headers
+
+  def user
+    @user ||= User.find(decoded_auth_token[:user_id]) if decoded_auth_token
+  end
+
+  def decoded_auth_token
+    @decoded_auth_token ||= JsonWebToken.decode http_auth_header
+  end
+
+  def http_auth_header
+    raise(ExceptionHandler::MissingToken, 'Missing Token') unless headers['Authorization'].present?
+    headers['Authorization'].split(' ').last
+  end
+end

app/channels/application_cable/channel.rb

@@ -0,0 +1,4 @@
+module ApplicationCable
+  class Channel < ActionCable::Channel::Base
+  end
+end

app/channels/application_cable/connection.rb

@@ -0,0 +1,4 @@
+module ApplicationCable
+  class Connection < ActionCable::Connection::Base
+  end
+end

app/controllers/application_controller.rb

@@ -0,0 +1,12 @@
+class ApplicationController < ActionController::API
+  include ExceptionHandler
+
+  before_action :authorize_request
+  attr_reader :current_user
+
+  private
+
+  def authorize_request
+    @current_user = (AuthorizeApiRequest.new(request.headers).call)[:user]
+  end
+end

app/controllers/authentication_controller.rb

@@ -0,0 +1,14 @@
+class AuthenticationController < ApplicationController
+  skip_before_action :authorize_request, only: :authenticate
+
+  def authenticate
+    auth_token = AuthenticateUser.new(authentication_params[:email], authentication_params[:password]).call
+    render json: {auth_token: auth_token}, status: :ok
+  end
+
+  private
+
+  def authentication_params
+    params.permit(:email, :password)
+  end
+end