Remove requirement of a current user in the VwG flow. (#512)

GoogleSignIn/Sources/GIDVerifyAccountDetail/Implementations/GIDVerifyAccountDetail.m

@@ -149,8 +149,6 @@ NSErrorDomain const kGIDVerifyErrorDomain = @"com.google.GIDVerifyAccountDetail"
     return;
   }
 
-  [self assertValidCurrentUser];
-
   // Explicitly throw exception for missing client ID here. This must come before
   // scheme check because schemes rely on reverse client IDs.
   [self assertValidParameters:options];
@@ -231,15 +229,6 @@ NSErrorDomain const kGIDVerifyErrorDomain = @"com.google.GIDVerifyAccountDetail"
 
 #pragma mark - Helpers
 
-// Assert that a current user exists.
-- (void)assertValidCurrentUser {
-  if (!GIDSignIn.sharedInstance.currentUser) {
-    // NOLINTNEXTLINE(google-objc-avoid-throwing-exception)
-    [NSException raise:NSInvalidArgumentException
-                format:@"|currentUser| must be set to verify."];
-  }
-}
-
 // Asserts the parameters being valid.
 - (void)assertValidParameters:(GIDSignInInternalOptions *)options {
   if (![options.configuration.clientID length]) {

Samples/Swift/DaysUntilBirthday/DaysUntilBirthdayUITests(iOS)/DaysUntilBirthdayUITests_iOS.swift

@@ -23,9 +23,11 @@ class DaysUntilBirthdayUITests_iOS: XCTestCase {
     "Would you like to save this password to use with apps and websites?"
   private let signInDisclaimerHeaderText =
     "Sign in to Days Until Birthday"
+  private let accessHeaderText = "Days Until Birthday wants access to your Google Account"
   private let additionalAccessHeaderText = "Days Until Birthday wants additional access to your Google Account"
   private let appTrustWarningText = "Make sure you trust Days Until Birthday"
   private let chooseAnAccountHeaderText = "Choose an account"
+  private let consentRequestHeaderText = "Share some info with Days Until Birthday"
   private let notNowText = "Not Now"
   private let timeout: TimeInterval = 30
 
@@ -68,6 +70,27 @@ class DaysUntilBirthdayUITests_iOS: XCTestCase {
       return XCTFail("Signing out should return user to sign in view")
     }
   }
+
+  func testFetchVerificationSignalAndDisconnect() {
+    sampleApp.launch()
+
+    XCTAssertTrue(navigateToVerifyMyAge())
+    XCTAssertTrue(displayVerificationSignal())
+
+    guard sampleApp
+            .navigationBars
+            .buttons["Sign-in with Google"]
+            .waitForExistence(timeout: timeout) else {
+      return XCTFail("Failed to show navigation button back to Sign In View")
+    }
+    sampleApp.navigationBars.buttons["Sign-in with Google"].tap()
+
+    guard sampleApp
+            .buttons["GoogleSignInButton"]
+            .waitForExistence(timeout: timeout) else {
+      return XCTFail("Failed to return user to sign in view")
+    }
+  }
 }
 
 extension DaysUntilBirthdayUITests_iOS {
@@ -262,10 +285,90 @@ extension DaysUntilBirthdayUITests_iOS {
     return true
   }
 
+  /// Navigates to the verification view from the user profile view.
+  /// - returns: `true` if the navigation was performed successfully.
+  /// - note: This method will attempt to find a pop up asking for permission to
+  /// sign in with Google.
+  func navigateToVerifyMyAge() -> Bool {
+    guard sampleApp.buttons["Verify"]
+            .waitForExistence(timeout: timeout) else {
+      XCTFail("Failed to find button navigating to verify my age view")
+      return false
+    }
+    sampleApp.buttons["Verify"].tap()
+
+    if springboardApp
+      .staticTexts[signInStaticText]
+      .waitForExistence(timeout: timeout) {
+      guard springboardApp
+              .buttons["Continue"]
+              .waitForExistence(timeout: timeout) else {
+        XCTFail("Failed to find 'Continue' button")
+        return false
+      }
+      springboardApp.buttons["Continue"].tap()
+
+      if sampleApp
+          .staticTexts[Credential.email.rawValue]
+          .waitForExistence(timeout: timeout) {
+        XCTAssertTrue(useExistingSignIn())
+      } else {
+        XCTAssertTrue(signInForTheFirstTime())
+      }
+
+      handleConsentRequestIfNeeded()
+    }
+
+    guard sampleApp.staticTexts["Verified Account!"]
+            .waitForExistence(timeout: timeout) else {
+      XCTFail("Failed to show age verification view")
+      return false
+    }
+
+    guard sampleApp.staticTexts["Access Token:"]
+            .waitForExistence(timeout: timeout) else {
+      XCTFail("Access Token element did not appear")
+      return false
+    }
+
+    return true
+  }
+
+  /// Displays a sheet over the Verification view with the fetched verification signal..
+  /// - returns: `true` if the display was performed successfully.
+  func displayVerificationSignal() -> Bool {
+    guard sampleApp.buttons["Fetch Age Verification Signal"]
+            .waitForExistence(timeout: timeout) else {
+      XCTFail("Failed to find button to refresh access token")
+      return false
+    }
+    sampleApp.buttons["Fetch Age Verification Signal"].tap()
+
+    guard sampleApp.staticTexts["User is verified over 18!"]
+            .waitForExistence(timeout: timeout) else {
+      XCTFail("Failed to show age verification signal view")
+      return false
+    }
+
+    guard sampleApp
+            .navigationBars
+            .buttons["Close"]
+            .waitForExistence(timeout: timeout) else {
+      XCTFail("Failed to show close button back to age signal view")
+      return false
+    }
+    sampleApp.navigationBars.buttons["Close"].tap()
+
+    return true
+  }
+
   /// Proceeds through the view with header "Days Until Birthday wants additional access to your Google Account" if needed.
   func handleAccessRequestIfNeeded() {
-    let currentlyShowingAdditionalAccessRequest = sampleApp.staticTexts[additionalAccessHeaderText]
-      .waitForExistence(timeout: timeout) && sampleApp.staticTexts[appTrustWarningText]
+    let currentlyShowingAdditionalAccessHeaderText =
+      sampleApp.staticTexts[additionalAccessHeaderText].waitForExistence(timeout: timeout) ||
+      sampleApp.staticTexts[accessHeaderText].waitForExistence(timeout: timeout)
+    let currentlyShowingAdditionalAccessRequest =
+      currentlyShowingAdditionalAccessHeaderText && sampleApp.staticTexts[appTrustWarningText]
       .waitForExistence(timeout: timeout) &&
     sampleApp.buttons["Continue"]
       .waitForExistence(timeout: timeout)
@@ -275,6 +378,17 @@ extension DaysUntilBirthdayUITests_iOS {
     }
   }
 
+  /// Proceeds through the view with header "Share some info with Days Until Birthday" if needed.
+  func handleConsentRequestIfNeeded() {
+    let currentlyShowingConsentRequest =
+      sampleApp.staticTexts[consentRequestHeaderText].waitForExistence(timeout: timeout)
+      && sampleApp.buttons["Agree"].waitForExistence(timeout: timeout)
+
+    if currentlyShowingConsentRequest {
+      sampleApp.buttons["Agree"].tap()
+    }
+  }
+
   /// Proceeds through the sign-in disclaimer view if needed.
   func handleSignInDisclaimerIfNeeded() {
     let currentlyShowingSignInDisclaimer = sampleApp.staticTexts[signInDisclaimerHeaderText]

Samples/Swift/DaysUntilBirthday/Shared/Views/SignInView.swift

@@ -19,6 +19,10 @@ import GoogleSignInSwift
 
 struct SignInView: View {
   @EnvironmentObject var authViewModel: AuthenticationViewModel
+#if os(iOS)
+  @State var verificationflowInitiated = false
+  @StateObject var verifiedAgeViewModel = VerifiedAgeViewModel()
+#endif
   @ObservedObject var vm = GoogleSignInButtonViewModel()
 
   var body: some View {
@@ -69,6 +73,38 @@ struct SignInView: View {
           #endif
         }
       }
+      HStack {
+        VStack {
+#if os(iOS)
+          Text("Verify your Age")
+            .font(.title)
+              .fontWeight(.semibold)
+              .frame(maxWidth: .infinity, alignment: .leading)
+              .padding()
+          Button(action: {
+            verifiedAgeViewModel.verifyUserAgeOver18()
+            verificationflowInitiated = true
+          }) {
+              Text("Verify")
+                .font(.headline)
+                .foregroundColor(.gray)
+                .padding()
+                .frame(maxWidth: .infinity, alignment: .leading)
+                .background(Color.white)
+                .overlay(
+                  RoundedRectangle(cornerRadius: 2)
+                    .stroke(Color.gray.opacity(0.3), lineWidth: 1))
+                    .shadow(color: Color.black.opacity(0.1), radius: 3, x: 0, y: 2)
+          }
+            .padding(.horizontal)
+          NavigationLink(isActive: $verificationflowInitiated) {
+            VerificationView(verifiedAgeViewModel: verifiedAgeViewModel)
+          } label: {
+            EmptyView()
+          }
+#endif
+        }
+      }
       Spacer()
     }
   }

Samples/Swift/DaysUntilBirthday/iOS/UserProfileView.swift

@@ -19,9 +19,6 @@ import GoogleSignIn
 
 struct UserProfileView: View {
   @EnvironmentObject var authViewModel: AuthenticationViewModel
-#if os(iOS)
-  @StateObject var verifiedAgeViewModel = VerifiedAgeViewModel()
-#endif
   @StateObject var birthdayViewModel = BirthdayViewModel()
   private var user: GIDGoogleUser? {
     return GIDSignIn.sharedInstance.currentUser
@@ -53,13 +50,6 @@ struct UserProfileView: View {
               return
             }
           })
-#if os(iOS)
-          NavigationLink(NSLocalizedString("Verify My Age", comment: "Verify Age"),
-                         destination: VerificationView(verifiedAgeViewModel: verifiedAgeViewModel)
-          .onAppear {
-            verifiedAgeViewModel.verifyUserAgeOver18()
-          })
-#endif
           Spacer()
         }
         .toolbar {