Add aggregate results by entityRef

Signed-off-by: Roohn <tol.ronald@gmail.com>

plugins/entity-feedback-backend/src/service/router.test.ts

@@ -258,6 +258,22 @@ describe('createRouter', () => {
     });
   });
 
+  describe('GET /ratings/:entityRef/aggregate', () => {
+    it('should get aggregated ratings for an entity correctly', async () => {
+      const response = await request(app)
+        .get('/ratings/component%3Adefault%2Fservice/aggregate')
+        .send();
+      expect(mockDbHandler.getRatings).toHaveBeenCalledWith(
+        'component:default/service',
+      );
+      expect(response.status).toEqual(200);
+      expect(response.body).toEqual({
+        DISLIKE: 1,
+        LIKE: 2,
+      });
+    });
+  });
+
   describe('POST /responses/:entityRef', () => {
     it('should record a response correctly', async () => {
       const body = { response: 'blah', comments: 'feedback', consent: true };

plugins/entity-feedback-backend/src/service/router.ts

@@ -25,7 +25,10 @@ import {
   getBearerTokenFromAuthorizationHeader,
   IdentityApi,
 } from '@backstage/plugin-auth-node';
-import { EntityRatingsData } from '@backstage/plugin-entity-feedback-common';
+import {
+  EntityRatingsData,
+  Ratings,
+} from '@backstage/plugin-entity-feedback-common';
 import express from 'express';
 import Router from 'express-promise-router';
 import { Logger } from 'winston';
@@ -167,6 +170,19 @@ export async function createRouter(
     res.json(ratings.filter(r => accessibleEntityRefs.includes(r.userRef)));
   });
 
+  router.get('/ratings/:entityRef/aggregate', async (req, res) => {
+    const entityRatings = (
+      await dbHandler.getRatings(req.params.entityRef)
+    ).reduce((ratings: Ratings, { rating }) => {
+      ratings[rating] = ratings[rating] ?? 0;
+      ratings[rating]++;
+
+      return ratings;
+    }, {});
+
+    res.json(entityRatings);
+  });
+
   router.post('/responses/:entityRef', async (req, res) => {
     const user = await identity.getIdentity({ request: req });
     const { response, comments, consent } = req.body;