Auth/PM-5099 Ensure consistent casing of email used for fingerprint generation in Auth Requests (#8571)

* Created method for handilng email-address-based fingerprint.

* Added test for new method.

* Added returns to annotation

libs/auth/src/common/services/auth-request/auth-request.service.spec.ts

@@ -27,6 +27,7 @@ describe("AuthRequestService", () => {
   const apiService = mock<ApiService>();
 
   let mockPrivateKey: Uint8Array;
+  let mockPublicKey: Uint8Array;
   const mockUserId = Utils.newGuid() as UserId;
 
   beforeEach(() => {
@@ -44,6 +45,7 @@ describe("AuthRequestService", () => {
     );
 
     mockPrivateKey = new Uint8Array(64);
+    mockPublicKey = new Uint8Array(64);
   });
 
   describe("authRequestPushNotification$", () => {
@@ -262,4 +264,14 @@ describe("AuthRequestService", () => {
       expect(result.masterKeyHash).toEqual(mockDecryptedMasterKeyHash);
     });
   });
+
+  describe("getFingerprintPhrase", () => {
+    it("returns the same fingerprint regardless of email casing", () => {
+      const email = "test@email.com";
+      const emailUpperCase = email.toUpperCase();
+      const phrase = sut.getFingerprintPhrase(email, mockPublicKey);
+      const phraseUpperCase = sut.getFingerprintPhrase(emailUpperCase, mockPublicKey);
+      expect(phrase).toEqual(phraseUpperCase);
+    });
+  });
 });

libs/auth/src/common/services/auth-request/auth-request.service.ts

@@ -198,4 +198,8 @@ export class AuthRequestService implements AuthRequestServiceAbstraction {
       this.authRequestPushNotificationSubject.next(notification.id);
     }
   }
+
+  async getFingerprintPhrase(email: string, publicKey: Uint8Array): Promise<string> {
+    return (await this.cryptoService.getFingerprint(email.toLowerCase(), publicKey)).join("-");
+  }
 }