Add projection for the patient retrieval endpoint

Setting the query parameter 'projection=partial' returns a partial patient (name, gender, birthDate and identifiers)

src/routes/index.ts

@@ -8,7 +8,7 @@ import { matchAsyncHandler } from './handlers/matchPatientAsync';
 import { matchSyncHandler } from './handlers/matchPatientSync';
 import { mpiMdmQueryLinksMiddleware } from '../middlewares/mpi-mdm-query-links';
 import { validationMiddleware } from '../middlewares/validation';
-import { buildOpenhimResponseObject, getData } from '../utils/utils';
+import { buildOpenhimResponseObject, getData, patientProjector } from '../utils/utils';
 import { fetchEverythingByRef } from './handlers/fetchPatientResources';
 import { mpiMdmSummaryMiddleware } from '../middlewares/mpi-mdm-summary';
 import { fetchPatientSummaryByRef } from './handlers/fetchPatientSummaries';
@@ -125,6 +125,9 @@ routes.get('/fhir/Patient/:patientId', async (req, res) => {
     const patient = mpiResponse.body as Patient;
 
     patient.id = requestedId;
+
+    if (req.query.projection === 'partial') mpiResponse.body = patientProjector(patient);
+
     logger.debug(
       `Mapped upstream ID ${upsteamId} to requested ID ${requestedId} in response body`
     );

src/utils/utils.ts

@@ -233,6 +233,10 @@ export const transformPatientResourceForMPI = (patient: Patient): MpiTransformRe
 export const restorePatientResource = (patientData: PatientData) => {
   patientData.restoredPatient = patientData.mpiResponsePatient;
 
+  // restore the source uuid of the patient
+  const id = Object.assign({id: ''}, patientData.mpiTransformResult?.patient).id;
+  patientData.restoredPatient = Object.assign({}, patientData.restoredPatient, {id});
+
   if (patientData.mpiTransformResult?.extension?.length) {
     patientData.restoredPatient = Object.assign({}, patientData.restoredPatient, {
       extension: patientData.mpiTransformResult.extension,
@@ -312,3 +316,14 @@ export const mergeBundles = async (
 
   return bundle;
 };
+
+export const patientProjector = (patient: Patient) : Patient => {
+  return {
+    resourceType: patient.resourceType,
+    id: patient.id,
+    identifier: patient.identifier,
+    name: patient.name,
+    birthDate: patient.birthDate,
+    gender: patient.gender
+  }
+};