Define an endpoint to retrieve a LibreCaptcha captcha

Gemfile

@@ -21,6 +21,7 @@ gem 'rack-cors'
 gem 'react-rails'
 gem 'rubytree'
 gem 'acts_as_tenant'
+gem 'httparty'
 
 group :development, :test do
   gem 'annotaterb'

Gemfile.lock

@@ -126,6 +126,10 @@ GEM
       raabro (~> 1.4)
     globalid (1.2.1)
       activesupport (>= 6.1)
+    httparty (0.22.0)
+      csv
+      mini_mime (>= 1.0.0)
+      multi_xml (>= 0.5.2)
     i18n (1.14.6)
       concurrent-ruby (~> 1.0)
     importmap-rails (2.0.3)
@@ -188,6 +192,8 @@ GEM
     money (6.19.0)
       i18n (>= 0.6.4, <= 2)
     msgpack (1.7.2)
+    multi_xml (0.7.1)
+      bigdecimal (~> 3.1)
     net-imap (0.5.1)
       date
       net-protocol
@@ -398,6 +404,7 @@ DEPENDENCIES
   devise (~> 4.9)
   factory_bot_rails
   faker
+  httparty
   importmap-rails
   jbuilder
   jsonapi-rails

app/controllers/captcha_controller.rb

@@ -0,0 +1,11 @@
+class CaptchaController < ApplicationController
+  skip_before_action :authenticate_user!
+
+  def create
+    id = LibreCaptcha.new.get_id
+    render json: {
+      id:,
+      media_url: media_captcha_index_url(id:)
+    }, status: :created
+  end
+end

app/services/libre_captcha.rb

@@ -0,0 +1,12 @@
+class LibreCaptcha
+  def get_id
+    HTTParty.post("http://libre-captcha:8888/v2/captcha", 
+      body: {
+        input_type: "text",
+        level: :hard,
+        media: 'image/png',
+        size: '350x100'
+      }.to_json
+    ).then { |raw| JSON.parse(raw)['id'] }
+  end
+end

config/routes.rb

@@ -23,6 +23,9 @@ Rails.application.routes.draw do
     resources :tables_arrangements, only: %i[index show]
   end
 
+  resources :captcha, only: :create do
+    get 'v2/media', to: 'captcha#media', on: :collection, as: :media
+  end
 
   mount Rswag::Ui::Engine => '/api-docs'
   mount Rswag::Api::Engine => '/api-docs'

docker-compose.yml

@@ -36,6 +36,12 @@ services:
       - backend
     volumes:
       - ../wedding-planner-frontend/:/app
+  libre-captcha:
+    image: librecaptcha/lc-core:latest
+    volumes: 
+      - "./tmp/libre-captcha-data:/lc-core/data"
+    ports: 
+      - "8888:8888"
   nginx:
     image: nginx:latest
     ports:

nginx.conf

@@ -12,6 +12,11 @@ server {
         proxy_set_header Host $http_host;
     }
 
+    location /captcha/ {
+        proxy_pass http://libre-captcha:8888/;
+        proxy_set_header Host $http_host;
+    }
+
     location / {
         proxy_pass http://frontend:3000;
         proxy_set_header Host $http_host;

spec/requests/captcha_spec.rb

@@ -0,0 +1,22 @@
+require 'swagger_helper'
+
+RSpec.describe 'captcha', type: :request do
+  path '/captcha' do
+
+    post('create a CAPTCHA challenge') do
+      tags 'CAPTCHA'
+      consumes 'application/json'
+      produces 'application/json'
+      
+      response(201, 'created') do
+        schema type: :object,
+        required: %i[id], 
+        properties: {
+          id: { type: :string, format: :uuid }
+          media_url: { type: :string, format: :uri }
+        }
+        xit
+      end
+    end
+  end
+end