LG-15861: check downstream health status for DoS composite healtcheck

app/services/doc_auth/dos/responses/health_check_response.rb

@@ -20,12 +20,23 @@ def initialize(faraday_response:)
         def success
           return false if faraday_error?
           return false if !parsed_body
-          parsed_body[:status].to_s.downcase == 'up'
+
+          healthy?(parsed_body)
+        end
+
+        def healthy?(status_body)
+          return false if status_body[:status].to_s.downcase != 'up'
+
+          status_body[:downstreamHealth]&.each do |h|
+            return false unless healthy?(h)
+          end
+
+          true
         end
 
         def extra
           {
-            body: body,
+            body:,
           }
         end
 
@@ -35,7 +46,7 @@ def body
         end
 
         def parsed_body
-          body && JSON.parse(body, symbolize_names: true)
+          @parsed_body ||= body && JSON.parse(body, symbolize_names: true)
         end
 
         def errors

spec/services/doc_auth/dos/responses/health_check_response_spec.rb

@@ -101,5 +101,56 @@ def make_faraday_response(status:)
     it 'includes the body in the extras' do
       expect(health_check_response.extra[:body]).to eq(health_check_down_body)
     end
+
+    context 'when composite healthheck down stream system is down' do
+      let(:faraday_response) do
+        Faraday.get(composite_health_check_endpoint)
+      end
+
+      let(:health_check_down_body) do
+        {
+          status: 'uP',
+          downstreamHealth: [
+            {
+              status: 'up',
+              downstreamHealth: nil,
+            },
+            {
+              status: 'up',
+              downstreamHealth: [],
+            },
+            {
+              status: 'up',
+              downstreamHealth: [
+                {
+                  status: 'up',
+                  downstreamHealth: nil,
+                },
+                {
+                  status: 'up',
+                  downstreamHealth: [],
+                },
+                {
+                  status: 'down',
+                },
+              ],
+            },
+          ],
+        }.to_json
+      end
+
+      before do
+        stub_request(:get, composite_health_check_endpoint)
+          .to_return_json(body: health_check_down_body)
+      end
+
+      it 'is not successful' do
+        expect(health_check_response).not_to be_success
+      end
+
+      it 'includes the body in the extras' do
+        expect(health_check_response.extra[:body]).to eq(health_check_down_body)
+      end
+    end
   end
 end