Show Offers on the DFC API

engines/dfc_provider/app/controllers/dfc_provider/offers_controller.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+module DfcProvider
+  class OffersController < DfcProvider::ApplicationController
+    before_action :check_enterprise
+
+    def show
+      subject = DfcBuilder.offer(variant)
+      render json: DfcIo.export(subject)
+    end
+
+    private
+
+    def variant
+      @variant ||= current_enterprise.supplied_variants.find(params[:id])
+    end
+  end
+end

engines/dfc_provider/config/routes.rb

@@ -4,6 +4,7 @@ DfcProvider::Engine.routes.draw do
   resources :addresses, only: [:show]
   resources :enterprises, only: [:show] do
     resources :catalog_items, only: [:index, :show, :update]
+    resources :offers, only: [:show]
     resources :supplied_products, only: [:create, :show, :update]
     resources :social_medias, only: [:show]
   end

engines/dfc_provider/spec/requests/offers_spec.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+require_relative "../swagger_helper"
+
+describe "Offers", type: :request, swagger_doc: "dfc.yaml", rswag_autodoc: true do
+  let!(:user) { create(:oidc_user) }
+  let!(:enterprise) { create(:distributor_enterprise, id: 10_000, owner: user) }
+  let!(:product) {
+    create(
+      :product,
+      id: 90_000,
+      supplier: enterprise, name: "Pesto", description: "Basil Pesto",
+      variants: [variant],
+    )
+  }
+  let(:variant) { build(:base_variant, id: 10_001, unit_value: 1) }
+
+  before { login_as user }
+
+  path "/api/dfc/enterprises/{enterprise_id}/offers/{id}" do
+    parameter name: :enterprise_id, in: :path, type: :string
+    parameter name: :id, in: :path, type: :string
+
+    let(:enterprise_id) { enterprise.id }
+
+    get "Show Offer" do
+      produces "application/json"
+
+      response "200", "success" do
+        let(:id) { variant.id }
+
+        run_test!
+      end
+    end
+  end
+end

swagger/dfc.yaml

@@ -409,6 +409,35 @@ paths:
                       dfc-b:URL: https://facebook.com/user
         '404':
           description: not found
+  "/api/dfc/enterprises/{enterprise_id}/offers/{id}":
+    parameters:
+    - name: enterprise_id
+      in: path
+      required: true
+      schema:
+        type: string
+    - name: id
+      in: path
+      required: true
+      schema:
+        type: string
+    get:
+      summary: Show Offer
+      tags:
+      - Offers
+      responses:
+        '200':
+          description: success
+          content:
+            application/json:
+              examples:
+                test_example:
+                  value:
+                    "@context": https://www.datafoodconsortium.org
+                    "@id": http://test.host/api/dfc/enterprises/10000/offers/10001
+                    "@type": dfc-b:Offer
+                    dfc-b:hasPrice: 19.99
+                    dfc-b:stockLimitation: 5
   "/api/dfc/persons/{id}":
     get:
       summary: Show person