Use capture timestamp instead of the timestamp on getCurrentPosition.

src/app/shared/services/capture/capture.service.ts

@@ -40,7 +40,10 @@ export class CaptureService {
     this._collectingOldProofHashes$.next(
       this._collectingOldProofHashes$.value.add(getOldProof(proof).hash)
     );
-    const collected = await this.collectorService.run(await proof.getAssets());
+    const collected = await this.collectorService.run(
+      await proof.getAssets(),
+      proof.timestamp
+    );
     const newCollectingOldProofHashes = this._collectingOldProofHashes$.value;
     newCollectingOldProofHashes.delete(getOldProof(proof).hash);
     this._collectingOldProofHashes$.next(newCollectingOldProofHashes);

src/app/shared/services/collector/collector.service.spec.ts

@@ -27,15 +27,15 @@ describe('CollectorService', () => {
   it('should be created', () => expect(service).toBeTruthy());
 
   it('should get the stored proof after run', async () => {
-    const proof = await service.run(ASSETS);
+    const proof = await service.run(ASSETS, Date.now());
     expect(await proof.getAssets()).toEqual(ASSETS);
   });
 
   it('should remove added truth providers', async () => {
     service.addFactsProvider(mockFactsProvider);
     service.removeFactsProvider(mockFactsProvider);
 
-    const proof = await service.run(ASSETS);
+    const proof = await service.run(ASSETS, Date.now());
 
     expect(proof.truth.providers).toEqual({});
   });
@@ -44,20 +44,20 @@ describe('CollectorService', () => {
     service.addSignatureProvider(mockSignatureProvider);
     service.removeSignatureProvider(mockSignatureProvider);
 
-    const proof = await service.run(ASSETS);
+    const proof = await service.run(ASSETS, Date.now());
 
     expect(proof.signatures).toEqual({});
   });
 
   it('should get the stored proof with provided facts', async () => {
     service.addFactsProvider(mockFactsProvider);
-    const proof = await service.run(ASSETS);
+    const proof = await service.run(ASSETS, Date.now());
     expect(proof.truth.providers).toEqual({ [mockFactsProvider.id]: FACTS });
   });
 
   it('should get the stored proof with provided signature', async () => {
     service.addSignatureProvider(mockSignatureProvider);
-    const proof = await service.run(ASSETS);
+    const proof = await service.run(ASSETS, Date.now());
     expect(proof.signatures).toEqual({ [mockSignatureProvider.id]: SIGNATURE });
   });
 });

src/app/shared/services/collector/collector.service.ts

@@ -20,22 +20,25 @@ export class CollectorService {
 
   constructor(private readonly imageStore: ImageStore) {}
 
-  async run(assets: Assets) {
-    const truth = await this.collectTruth(assets);
+  async run(assets: Assets, capturedTimestamp: number) {
+    const truth = await this.collectTruth(assets, capturedTimestamp);
     const signatures = await this.signTargets({ assets, truth });
     const proof = await Proof.from(this.imageStore, assets, truth, signatures);
     proof.isCollected = true;
     return proof;
   }
 
-  private async collectTruth(assets: Assets): Promise<Truth> {
+  private async collectTruth(
+    assets: Assets,
+    capturedTimestamp: number
+  ): Promise<Truth> {
     return {
       timestamp: Date.now(),
       providers: Object.fromEntries(
         await Promise.all(
           [...this.factsProviders].map(async provider => [
             provider.id,
-            await provider.provide(assets),
+            await provider.provide(assets, capturedTimestamp),
           ])
         )
       ),

src/app/shared/services/collector/facts/capacitor-facts-provider/capacitor-facts-provider.service.ts

@@ -31,9 +31,12 @@ export class CapacitorFactsProvider implements FactsProvider {
     private readonly translocoService: TranslocoService
   ) {}
 
-  async provide(_: Assets): Promise<Facts> {
+  async provide(
+    _: Assets,
+    capturedTimestamp: number = Date.now()
+  ): Promise<Facts> {
     const deviceInfo = await this.collectDeviceInfo();
-    const locationInfo = await this.collectLocationInfo();
+    const locationInfo = await this.collectLocationInfo(capturedTimestamp);
     return {
       [DefaultFactId.DEVICE_NAME]: deviceInfo?.model,
       [DefaultFactId.GEOLOCATION_LATITUDE]: locationInfo?.coords.latitude,
@@ -65,7 +68,7 @@ export class CapacitorFactsProvider implements FactsProvider {
     return { ...(await Device.getInfo()), ...(await Device.getBatteryInfo()) };
   }
 
-  private async collectLocationInfo() {
+  private async collectLocationInfo(capturedTimestamp: number) {
     const defaultGeolocationAge = 30000;
     const defaultGeolocationTimeout = 20000;
     const isLocationInfoCollectionEnabled = await this.isGeolocationInfoCollectionEnabled();
@@ -75,6 +78,7 @@ export class CapacitorFactsProvider implements FactsProvider {
 
     return this.geolocationService
       .getCurrentPosition({
+        capturedTimestamp,
         enableHighAccuracy: true,
         maximumAge: defaultGeolocationAge,
         timeout: defaultGeolocationTimeout,

src/app/shared/services/collector/facts/facts-provider.ts

@@ -2,5 +2,5 @@ import { Assets, Facts } from '../../repositories/proof/proof';
 
 export interface FactsProvider {
   readonly id: string;
-  provide(assets: Assets): Promise<Facts>;
+  provide(assets: Assets, capturedTimestamp?: number): Promise<Facts>;
 }

src/app/shared/services/geolocation/geolocation.service.ts

@@ -11,41 +11,53 @@ export class GeolocationService {
   // Cache the current position manually due to the issue of Capacitor
   // geolocation plugin: https://github.com/ionic-team/capacitor/issues/3304
   private currentPositionCache?: Position;
-  private lastRequestTimestamp?: number;
+  private lastCaptureTimestamp?: number;
 
   constructor(
     @Inject(GEOLOCATION_PLUGIN)
     private readonly geolocationPlugin: GeolocationPlugin
   ) {}
 
   async getCurrentPosition(
-    { enableHighAccuracy, timeout, maximumAge }: GetCurrentPositionOptions = {
+    {
+      capturedTimestamp,
+      enableHighAccuracy,
+      timeout,
+      maximumAge,
+    }: GetCurrentPositionOptions = {
       enableHighAccuracy: true,
       timeout: undefined,
       maximumAge: undefined,
     }
   ): Promise<Position | undefined> {
     const result = await this._getCurrentPosition({
+      capturedTimestamp,
       enableHighAccuracy,
       timeout,
       maximumAge,
     });
-    this.lastRequestTimestamp = Date.now();
+    this.lastCaptureTimestamp = capturedTimestamp;
     return result;
   }
 
   private async _getCurrentPosition(
-    { enableHighAccuracy, timeout, maximumAge }: GetCurrentPositionOptions = {
+    {
+      capturedTimestamp,
+      enableHighAccuracy,
+      timeout,
+      maximumAge,
+    }: GetCurrentPositionOptions = {
       enableHighAccuracy: true,
       timeout: undefined,
       maximumAge: undefined,
     }
   ): Promise<Position | undefined> {
     if (
+      capturedTimestamp &&
       maximumAge &&
       maximumAge > 0 &&
       this.currentPositionCache &&
-      Date.now() - this.currentPositionCache.timestamp < maximumAge
+      capturedTimestamp - this.currentPositionCache.timestamp < maximumAge
     ) {
       return this.currentPositionCache;
     }
@@ -74,9 +86,10 @@ export class GeolocationService {
     }
 
     if (
-      this.lastRequestTimestamp &&
+      capturedTimestamp &&
+      this.lastCaptureTimestamp &&
       maximumAge &&
-      Date.now() - this.lastRequestTimestamp < maximumAge
+      capturedTimestamp - this.lastCaptureTimestamp < maximumAge
     ) {
       return this.currentPositionCache;
     }
@@ -94,6 +107,7 @@ async function getTimer(timeout: number) {
 }
 
 export interface GetCurrentPositionOptions {
+  readonly capturedTimestamp?: number;
   readonly enableHighAccuracy?: boolean;
   readonly timeout?: number;
   readonly maximumAge?: number;