Consume new endpoint to return last 14 days keys after onboarding

Author: henrytao-me

.env

@@ -6,8 +6,7 @@ APP_VERSION_NAME=1.0
 SUBMIT_URL=https://submission.covidshield.app
 RETRIEVE_URL=https://retrieval.covidshield.app
 HMAC_KEY=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
-REGION=302
-MCC_CODE=302;
+REGION=302;
 TRANSMISSION_RISK_LEVEL=2
 MINIMUM_FETCH_INTERVAL=15
 

src/services/BackendService/BackendService.spec.ts

@@ -1,3 +1,4 @@
+import {downloadDiagnosisKeysFile} from '../../bridge/CovidShield';
 import {TemporaryExposureKey} from '../../bridge/ExposureNotification';
 
 import {BackendService} from './BackendService';
@@ -89,7 +90,7 @@ describe('BackendService', () => {
 
   describe('reportDiagnosisKeys', () => {
     it('returns last 14 keys if there is more than 14', async () => {
-      const backendService = new BackendService('http://localhost', 'https://localhost', 'mock', 0);
+      const backendService = new BackendService('http://localhost', 'https://localhost', 'mock', 302);
       const keys = generateRandomKeys(20);
 
       await backendService.reportDiagnosisKeys(
@@ -115,4 +116,26 @@ describe('BackendService', () => {
         });
     });
   });
+
+  describe('retrieveDiagnosisKeys', () => {
+    it('returns keys file for set period', async () => {
+      const backendService = new BackendService('http://localhost', 'https://localhost', 'mock', 302);
+
+      await backendService.retrieveDiagnosisKeys(18457);
+
+      expect(downloadDiagnosisKeysFile).toHaveBeenCalledWith(
+        'http://localhost/retrieve/302/18457/c4d9820c20f7073e47f54cc1bd24475fb98c8ab9ffc0ea81dded3f8ebfb48b67',
+      );
+    });
+
+    it('returns keys file for 14 days if period is 0', async () => {
+      const backendService = new BackendService('http://localhost', 'https://localhost', 'mock', 302);
+
+      await backendService.retrieveDiagnosisKeys(0);
+
+      expect(downloadDiagnosisKeysFile).toHaveBeenCalledWith(
+        'http://localhost/retrieve/302/00000/ca365ad512568f4292953403590b398e3f1336efcb4f1acedb20926c35408bd9',
+      );
+    });
+  });
 });

src/services/BackendService/BackendService.ts

@@ -6,7 +6,7 @@ import {TemporaryExposureKey} from 'bridge/ExposureNotification';
 import nacl from 'tweetnacl';
 import {getRandomBytes, downloadDiagnosisKeysFile} from 'bridge/CovidShield';
 import {blobFetch} from 'shared/fetch';
-import {TRANSMISSION_RISK_LEVEL, REGION} from 'env';
+import {TRANSMISSION_RISK_LEVEL} from 'env';
 import {captureMessage} from 'shared/log';
 
 import {covidshield} from './covidshield';
@@ -15,6 +15,9 @@ import {BackendInterface, SubmissionKeySet} from './types';
 const MAX_UPLOAD_KEYS = 14;
 const FETCH_HEADERS = {headers: {'Cache-Control': 'no-store'}};
 
+// See https://github.com/cds-snc/covid-shield-server/pull/176
+const LAST_14_DAYS_PERIOD = '00000';
+
 export class BackendService implements BackendInterface {
   retrieveUrl: string;
   submitUrl: string;
@@ -29,15 +32,16 @@ export class BackendService implements BackendInterface {
   }
 
   async retrieveDiagnosisKeys(period: number) {
-    const message = `${this.region}:${period}:${Math.floor(Date.now() / 1000 / 3600)}`;
+    const periodStr = `${period > 0 ? period : LAST_14_DAYS_PERIOD}`;
+    const message = `${this.region}:${periodStr}:${Math.floor(Date.now() / 1000 / 3600)}`;
     const hmac = hmac256(message, encHex.parse(this.hmacKey)).toString(encHex);
-    const url = `${this.retrieveUrl}/retrieve/${this.region}/${period}/${hmac}`;
+    const url = `${this.retrieveUrl}/retrieve/${this.region}/${periodStr}/${hmac}`;
     captureMessage('retrieveDiagnosisKeys', {period, url});
     return downloadDiagnosisKeysFile(url);
   }
 
   async getExposureConfiguration() {
-    const url = `${this.retrieveUrl}/exposure-configuration/${REGION}.json`;
+    const url = `${this.retrieveUrl}/exposure-configuration/${this.region}.json`;
     captureMessage('getExposureConfiguration', {url});
     return (await fetch(url, FETCH_HEADERS)).json();
   }

src/services/ExposureNotificationService/ExposureNotificationService.spec.ts

@@ -82,7 +82,7 @@ describe('ExposureNotificationService', () => {
       .mockImplementation((args: any) => new OriginalDate(args));
 
     await service.updateExposureStatus();
-    expect(server.retrieveDiagnosisKeys).toHaveBeenCalledTimes(14);
+    expect(server.retrieveDiagnosisKeys).toHaveBeenCalledTimes(1);
   });
 
   it('backfills the right amount of keys for current day', async () => {
@@ -98,7 +98,7 @@ describe('ExposureNotificationService', () => {
       },
     });
     await service.updateExposureStatus();
-    expect(server.retrieveDiagnosisKeys).toHaveBeenCalledTimes(0);
+    expect(server.retrieveDiagnosisKeys).toHaveBeenCalledTimes(1);
 
     server.retrieveDiagnosisKeys.mockClear();
 
@@ -109,7 +109,7 @@ describe('ExposureNotificationService', () => {
       },
     });
     await service.updateExposureStatus();
-    expect(server.retrieveDiagnosisKeys).toHaveBeenCalledTimes(1);
+    expect(server.retrieveDiagnosisKeys).toHaveBeenCalledTimes(2);
 
     server.retrieveDiagnosisKeys.mockClear();
 
@@ -120,7 +120,7 @@ describe('ExposureNotificationService', () => {
       },
     });
     await service.updateExposureStatus();
-    expect(server.retrieveDiagnosisKeys).toHaveBeenCalledTimes(2);
+    expect(server.retrieveDiagnosisKeys).toHaveBeenCalledTimes(3);
   });
 
   it('serializes status update', async () => {

src/services/ExposureNotificationService/ExposureNotificationService.ts

@@ -1,4 +1,3 @@
-import {Platform} from 'react-native';
 import ExposureNotification, {
   ExposureSummary,
   Status as SystemStatus,
@@ -263,10 +262,20 @@ export class ExposureNotificationService {
   ): AsyncGenerator<{keysFileUrl: string; period: number} | null> {
     const runningDate = new Date();
 
-    const lastCheckedPeriod =
-      _lastCheckedPeriod || periodSinceEpoch(addDays(runningDate, -EXPOSURE_NOTIFICATION_CYCLE), HOURS_PER_PERIOD);
     let runningPeriod = periodSinceEpoch(runningDate, HOURS_PER_PERIOD);
 
+    if (!_lastCheckedPeriod) {
+      try {
+        const keysFileUrl = await this.backendInterface.retrieveDiagnosisKeys(0);
+        yield {keysFileUrl, period: runningPeriod};
+      } catch (error) {
+        captureException('Error while downloading batch files', error);
+      }
+      return;
+    }
+
+    const lastCheckedPeriod = Math.max(_lastCheckedPeriod - 1, runningPeriod - EXPOSURE_NOTIFICATION_CYCLE);
+
     while (runningPeriod > lastCheckedPeriod) {
       try {
         const keysFileUrl = await this.backendInterface.retrieveDiagnosisKeys(runningPeriod);
@@ -339,12 +348,7 @@ export class ExposureNotificationService {
       if (!value) continue;
       const {keysFileUrl, period} = value;
       keysFileUrls.push(keysFileUrl);
-
-      // Temporarily disable persisting lastCheckPeriod on Android
-      // Ref https://github.com/cds-snc/covid-shield-mobile/issues/453
-      if (Platform.OS !== 'android') {
-        lastCheckedPeriod = Math.max(lastCheckedPeriod || 0, period);
-      }
+      lastCheckedPeriod = Math.max(lastCheckedPeriod || 0, period);
     }
 
     captureMessage('performExposureStatusUpdate', {
@@ -365,11 +369,12 @@ export class ExposureNotificationService {
           lastCheckedPeriod,
         );
       }
+      return finalize({}, lastCheckedPeriod);
     } catch (error) {
       captureException('performExposureStatusUpdate', error);
     }
 
-    return finalize({}, lastCheckedPeriod);
+    return finalize();
   }
 
   private async processPendingExposureSummary() {