Implement viewpoints/:uuid/snapshot

modules/bcf/app/controllers/bcf/api/v2_1/topics_api.rb

@@ -47,9 +47,9 @@ module Bcf::API::V2_1
                   scope: -> { topics })
              .mount
 
-      route_param :uuid, regexp: /\A[a-f0-9\-]+\z/ do
+      route_param :topic_uuid, regexp: /\A[a-f0-9\-]+\z/ do
         after_validation do
-          @issue = topics.find_by_uuid!(params[:uuid])
+          @issue = topics.find_by_uuid!(params[:topic_uuid])
         end
 
         get &::Bcf::API::V2_1::Endpoints::Show

modules/bcf/app/controllers/bcf/api/v2_1/viewpoints_api.rb

@@ -37,15 +37,27 @@ module Bcf::API::V2_1
                   scope: -> { @issue.viewpoints })
              .mount
 
-      route_param :uuid, regexp: /\A[a-f0-9\-]+\z/ do
+      route_param :viewpoint_uuid, regexp: /\A[a-f0-9\-]+\z/ do
         after_validation do
-          @viewpoint = @issue.viewpoints.find_by_uuid!(params[:uuid])
+          @viewpoint = @issue.viewpoints.find_by_uuid!(params[:viewpoint_uuid])
         end
 
         get &::Bcf::API::V2_1::Endpoints::Show
               .new(model: Bcf::Viewpoint,
                    api_name: 'Viewpoints')
               .mount
+
+        namespace :snapshot do
+          helpers ::API::Helpers::AttachmentRenderer
+
+          get do
+            if snapshot = @viewpoint.snapshot
+              respond_with_attachment snapshot
+            else
+              raise ActiveRecord::RecordNotFound
+            end
+          end
+        end
       end
     end
   end

modules/bcf/spec/factories/bcf_viewpoint_factory.rb

@@ -156,8 +156,14 @@ FactoryBot.define do
       MARKUP
     end
 
-    after(:create) do |viewpoint|
-      create(:bcf_viewpoint_attachment, container: viewpoint)
+    transient do
+      snapshot { nil }
+    end
+
+    after(:create) do |viewpoint, evaluator|
+      unless evaluator.snapshot == false
+        create(:bcf_viewpoint_attachment, container: viewpoint)
+      end
     end
   end
 end

modules/bcf/spec/requests/api/bcf/v2_1/viewpoints_api_spec.rb

@@ -103,4 +103,32 @@ describe 'BCF 2.1 viewpoints resource', type: :request, content_type: :json, wit
       it_behaves_like 'bcf api not found response'
     end
   end
+
+  describe 'GET /api/bcf/2.1/projects/:project_id/topics/:uuid/viewpoints/:uuid/snapshot' do
+    let(:path) { "/api/bcf/2.1/projects/#{project.id}/topics/#{bcf_issue.uuid}/viewpoints/#{viewpoint.uuid}/snapshot" }
+    let(:current_user) { view_only_user }
+
+    context 'when snapshot present' do
+      before do
+        login_as(current_user)
+        bcf_issue
+        get path
+      end
+
+      it 'responds with the attachment' do
+        expect(subject.status).to eq 200
+        expect(subject.headers['Content-Type']).to eq 'image/jpeg'
+      end
+    end
+
+    context 'when snapshot not present' do
+      before do
+        login_as(current_user)
+        viewpoint.snapshot.destroy
+        get path
+      end
+
+      it_behaves_like 'bcf api not found response'
+    end
+  end
 end