first pass at backend!

backend/.gitignore

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+.env

backend/Gemfile

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+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+# gem "rails"
+
+gem 'grape'
+
+gem 'airctiverecord', '~> 0.2.1'
+
+gem 'dotenv', '~> 3.2'
+
+gem 'zeitwerk', '~> 2.6'
+
+gem 'rackup'
+
+gem 'puma', '~> 7.1'
+
+gem 'rack', '~> 3.2'
+
+gem 'omniauth'
+gem 'omniauth_openid_connect'
+gem 'rack-session'

backend/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    activemodel (8.1.1)
+      activesupport (= 8.1.1)
+    activesupport (8.1.1)
+      base64
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.3.1)
+      connection_pool (>= 2.2.5)
+      drb
+      i18n (>= 1.6, < 2)
+      json
+      logger (>= 1.4.2)
+      minitest (>= 5.1)
+      securerandom (>= 0.3)
+      tzinfo (~> 2.0, >= 2.0.5)
+      uri (>= 0.13.1)
+    aes_key_wrap (1.1.0)
+    airctiverecord (0.2.1)
+      activemodel (>= 6.0)
+      activesupport (>= 6.0)
+      airrel (>= 0.2.0)
+      norairrecord (~> 0.5)
+    airrel (0.2.1)
+      norairrecord (>= 0.1.0)
+    attr_required (1.0.2)
+    base64 (0.3.0)
+    bigdecimal (3.3.1)
+    bindata (2.5.1)
+    concurrent-ruby (1.3.5)
+    connection_pool (2.5.5)
+    date (3.5.0)
+    dotenv (3.2.0)
+    drb (2.2.3)
+    dry-configurable (1.3.0)
+      dry-core (~> 1.1)
+      zeitwerk (~> 2.6)
+    dry-core (1.1.0)
+      concurrent-ruby (~> 1.0)
+      logger
+      zeitwerk (~> 2.6)
+    dry-inflector (1.2.0)
+    dry-logic (1.6.0)
+      bigdecimal
+      concurrent-ruby (~> 1.0)
+      dry-core (~> 1.1)
+      zeitwerk (~> 2.6)
+    dry-types (1.8.3)
+      bigdecimal (~> 3.0)
+      concurrent-ruby (~> 1.0)
+      dry-core (~> 1.0)
+      dry-inflector (~> 1.0)
+      dry-logic (~> 1.4)
+      zeitwerk (~> 2.6)
+    email_validator (2.2.4)
+      activemodel
+    faraday (2.14.0)
+      faraday-net_http (>= 2.0, < 3.5)
+      json
+      logger
+    faraday-follow_redirects (0.4.0)
+      faraday (>= 1, < 3)
+    faraday-net_http (3.4.2)
+      net-http (~> 0.5)
+    faraday-net_http_persistent (2.3.1)
+      faraday (~> 2.5)
+      net-http-persistent (>= 4.0.4, < 5)
+    grape (3.0.1)
+      activesupport (>= 7.0)
+      dry-configurable
+      dry-types (>= 1.1)
+      mustermann-grape (~> 1.1.0)
+      rack (>= 2)
+      zeitwerk
+    hashie (5.0.0)
+    i18n (1.14.7)
+      concurrent-ruby (~> 1.0)
+    json (2.17.1)
+    json-jwt (1.17.0)
+      activesupport (>= 4.2)
+      aes_key_wrap
+      base64
+      bindata
+      faraday (~> 2.0)
+      faraday-follow_redirects
+    logger (1.7.0)
+    mail (2.9.0)
+      logger
+      mini_mime (>= 0.1.1)
+      net-imap
+      net-pop
+      net-smtp
+    mini_mime (1.1.5)
+    minitest (5.26.2)
+    mustermann (3.0.4)
+      ruby2_keywords (~> 0.0.1)
+    mustermann-grape (1.1.0)
+      mustermann (>= 1.0.0)
+    net-http (0.8.0)
+      uri (>= 0.11.1)
+    net-http-persistent (4.0.6)
+      connection_pool (~> 2.2, >= 2.2.4)
+    net-imap (0.5.12)
+      date
+      net-protocol
+    net-pop (0.1.2)
+      net-protocol
+    net-protocol (0.2.2)
+      timeout
+    net-smtp (0.5.1)
+      net-protocol
+    nio4r (2.7.5)
+    norairrecord (0.5.1)
+      faraday (>= 1.0, < 3.0)
+      faraday-net_http_persistent
+      net-http-persistent
+    omniauth (2.1.4)
+      hashie (>= 3.4.6)
+      logger
+      rack (>= 2.2.3)
+      rack-protection
+    omniauth_openid_connect (0.8.0)
+      omniauth (>= 1.9, < 3)
+      openid_connect (~> 2.2)
+    openid_connect (2.3.1)
+      activemodel
+      attr_required (>= 1.0.0)
+      email_validator
+      faraday (~> 2.0)
+      faraday-follow_redirects
+      json-jwt (>= 1.16)
+      mail
+      rack-oauth2 (~> 2.2)
+      swd (~> 2.0)
+      tzinfo
+      validate_url
+      webfinger (~> 2.0)
+    public_suffix (7.0.0)
+    puma (7.1.0)
+      nio4r (~> 2.0)
+    rack (3.2.4)
+    rack-oauth2 (2.3.0)
+      activesupport
+      attr_required
+      faraday (~> 2.0)
+      faraday-follow_redirects
+      json-jwt (>= 1.11.0)
+      rack (>= 2.1.0)
+    rack-protection (4.2.1)
+      base64 (>= 0.1.0)
+      logger (>= 1.6.0)
+      rack (>= 3.0.0, < 4)
+    rack-session (2.1.1)
+      base64 (>= 0.1.0)
+      rack (>= 3.0.0)
+    rackup (2.3.1)
+      rack (>= 3)
+    ruby2_keywords (0.0.5)
+    securerandom (0.4.1)
+    swd (2.0.3)
+      activesupport (>= 3)
+      attr_required (>= 0.0.5)
+      faraday (~> 2.0)
+      faraday-follow_redirects
+    timeout (0.4.4)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    uri (1.1.1)
+    validate_url (1.0.15)
+      activemodel (>= 3.0.0)
+      public_suffix
+    webfinger (2.1.3)
+      activesupport
+      faraday (~> 2.0)
+      faraday-follow_redirects
+    zeitwerk (2.7.3)
+
+PLATFORMS
+  arm64-darwin-24
+  ruby
+
+DEPENDENCIES
+  airctiverecord (~> 0.2.1)
+  dotenv (~> 3.2)
+  grape
+  omniauth
+  omniauth_openid_connect
+  puma (~> 7.1)
+  rack (~> 3.2)
+  rack-session
+  rackup
+  zeitwerk (~> 2.6)
+
+BUNDLED WITH
+   2.7.2

backend/api/app.rb

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+# frozen_string_literal: true
+
+class App < Grape::API
+  format :json
+
+  mount Auth
+  mount Stickers
+end

backend/api/auth.rb

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+# frozen_string_literal: true
+
+class Auth < Grape::API
+  format :json
+  helpers SessionHelpers
+
+  namespace :auth do
+    get :login do
+      redirect '/auth/oidc'
+    end
+
+    get 'oidc/callback' do
+      auth = env['omniauth.auth']
+      session[:user] = {
+        id: auth.uid,
+        email: auth.info.email,
+        name: auth.info.name
+      }
+      redirect ENV.fetch('AUTH_SUCCESS_REDIRECT', '/')
+    end
+
+    get :logout do
+      session.clear
+      redirect ENV.fetch('AUTH_LOGOUT_REDIRECT', '/')
+    end
+
+    get :me do
+      error!('Unauthorized', 401) unless current_user
+      current_user
+    end
+  end
+end

backend/api/base.rb

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+# frozen_string_literal: true
+
+class Base < Grape::API
+  format :json
+  helpers SessionHelpers
+end

backend/api/session_helpers.rb

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+# frozen_string_literal: true
+
+module SessionHelpers
+  def session
+    env['rack.session']
+  end
+
+  def current_user
+    session[:user]
+  end
+
+  def authenticate!
+    error!('Unauthorized', 401) unless current_user
+  end
+end

backend/api/stickers.rb

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+# frozen_string_literal: true
+
+class Stickers < Base
+  helpers SessionHelpers
+
+  resource :stickers do
+    get do
+      Sticker.only_active.all.map(&:as_json) + [current_user: current_user]
+    end
+
+    before do
+      @sticker = Sticker.only_active.where(autonumber: params[:id]).first || error!('not found', 404)
+    end
+
+    route_param :id, type: String do
+      before { authenticate! }
+      get do
+        @sticker.as_json
+      end
+      get '/backwards' do
+        @sticker.name.reverse
+      end
+    end
+  end
+end

backend/boot.rb

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+# frozen_string_literal: true
+
+require 'bundler/setup'
+
+require 'dotenv'
+require 'zeitwerk'
+require 'airctiverecord'
+require 'grape'
+
+Dotenv.load
+
+Norairrecord.api_key = ENV['AIRTABLE_PAT']
+
+loader = Zeitwerk::Loader.new
+loader.push_dir("#{__dir__}/models")
+loader.push_dir("#{__dir__}/api")
+loader.enable_reloading
+loader.setup
+loader.eager_load
+
+def reload!
+  loader.reload
+end
+
+LOADER = loader

backend/config.ru

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+# frozen_string_literal: true
+
+require 'dotenv'
+Dotenv.load
+
+require_relative 'boot'
+require 'grape'
+require 'rack/session'
+require 'omniauth'
+require 'omniauth_openid_connect'
+
+use Rack::Session::Cookie,
+    key: 'stickers.session',
+    secret: ENV.fetch('SESSION_SECRET'),
+    same_site: :lax,
+    expire_after: 86_400 * 7
+
+OmniAuth.config.allowed_request_methods = %i[get post]
+
+use OmniAuth::Builder do
+  provider :openid_connect,
+           name: :oidc,
+           issuer: ENV.fetch('OIDC_ISSUER'),
+           discovery: true,
+           client_options: {
+             identifier: ENV.fetch('OIDC_CLIENT_ID'),
+             secret: ENV.fetch('OIDC_CLIENT_SECRET'),
+             redirect_uri: ENV.fetch('OIDC_REDIRECT_URI'),
+             host: 'auth.hackclub.com',
+             scheme: 'https'
+           },
+           scope: %i[openid email profile name address]
+end
+
+run lambda { |env|
+  LOADER.reload
+  App.call(env)
+}

backend/models/application_record.rb

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+class ApplicationRecord < AirctiveRecord::Base
+  self.base_key = ENV['AIRTABLE_BASE']
+end

backend/models/sticker.rb

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+class Sticker < ApplicationRecord
+  self.table_name = "tbl9kLyUrZNCJWf3L"
+
+  field :name, "Name"
+  field :active, "active"
+  field :autonumber, "id"
+  field :image_attachment, "image"
+
+  scope :only_active, -> { where(active: true) }
+
+  def as_json(options = nil)
+    { id: autonumber, name: name, image: }
+  end
+
+  def image = image_attachment&.dig(0, "url")
+
+end