Gandhiakshat/sbc amr sample app

Samples/Swift/DaysUntilBirthday/Shared/Models/Claim.swift

@@ -0,0 +1,6 @@
+
+struct Claim: Identifiable {
+  let key: String
+  let value: String
+  var id: String {key}
+}

Samples/Swift/DaysUntilBirthday/Shared/Services/GoogleSignInAuthenticator.swift

@@ -20,7 +20,7 @@ import GoogleSignIn
 /// An observable class for authenticating via Google.
 final class GoogleSignInAuthenticator: ObservableObject {
   private var authViewModel: AuthenticationViewModel
-  private var claims: Set<GIDClaim> = Set([GIDClaim.authTime()])
+  private let claims: Set<GIDClaim> = [GIDClaim.essentialAMR(), GIDClaim.authTime()]
 
   /// Creates an instance of this authenticator.
   /// - parameter authViewModel: The view model this authenticator will set logged in status on.

Samples/Swift/DaysUntilBirthday/Shared/ViewModels/AuthenticationViewModel.swift

@@ -26,15 +26,15 @@ final class AuthenticationViewModel: ObservableObject {
     return GoogleSignInAuthenticator(authViewModel: self)
   }
 
-  /// The user's `auth_time` as found in `idToken`.
-  /// - note: If the user is logged out, then this will default to `nil`.
-  var authTime: Date? {
+  /// The user's `claims` as found in `idToken`.
+  /// - note: If the user is logged out, then this will default to empty.
+  var claims: [Claim] {
     switch state {
     case .signedIn(let user):
-      guard let idToken = user.idToken?.tokenString else { return nil }
-      return decodeAuthTime(fromJWT: idToken)
+      guard let idToken = user.idToken?.tokenString else { return [] }
+      return decodeClaims(fromJwt: idToken)
     case .signedOut:
-      return nil
+      return []
     }
   }
 
@@ -82,23 +82,25 @@ final class AuthenticationViewModel: ObservableObject {
   @MainActor func addBirthdayReadScope(completion: @escaping () -> Void) {
       authenticator.addBirthdayReadScope(completion: completion)
   }
-
-  var formattedAuthTimeString: String? {
-    guard let date = authTime else { return nil }
-    let formatter = DateFormatter()
-    formatter.dateFormat = "MMM d, yyyy 'at' h:mm a"
-    return formatter.string(from: date)
-  }
 }
 
 private extension AuthenticationViewModel {
-  func decodeAuthTime(fromJWT jwt: String) -> Date? {
+  /// Returns a collection of formatted claim keys and values decoded from a JWT.
+  func decodeClaims(fromJwt jwt: String) -> [Claim] {
     let segments = jwt.components(separatedBy: ".")
-    guard let parts = decodeJWTSegment(segments[1]),
-          let authTimeInterval = parts["auth_time"] as? TimeInterval else {
-      return nil
+
+    guard segments.count > 1,
+      let payload = decodeJWTSegment(segments[1])
+    else {
+      return []
     }
-    return Date(timeIntervalSince1970: authTimeInterval)
+
+    let claims: [Claim?] = [
+      formatAuthTime(from: payload),
+      formatAmr(from: payload)
+    ]
+
+    return claims.compactMap { $0 }
   }
 
   func decodeJWTSegment(_ segment: String) -> [String: Any]? {
@@ -124,6 +126,26 @@ private extension AuthenticationViewModel {
     }
     return Data(base64Encoded: base64, options: .ignoreUnknownCharacters)
   }
+
+  /// Returns the `auth_time` claim from the given JWT, if present.
+  func formatAuthTime(from payload: [String: Any]) -> Claim? {
+    guard let authTime = payload["auth_time"] as? TimeInterval
+    else {
+      return nil
+    }
+    let date = Date(timeIntervalSince1970: authTime)
+    let formattedDate = DateFormatter.localizedString(from: date, dateStyle: .medium, timeStyle: .medium)
+    return Claim(key: "auth_time", value: formattedDate)
+  }
+
+  /// Returns the `amr` claim from the given JWT, if present.
+  private func formatAmr(from payload: [String: Any]) -> Claim? {
+    guard let amr = payload["amr"] as? [String]
+    else {
+      return nil
+    }
+    return Claim(key: "amr", value: amr.joined(separator: ", "))
+  }
 }
 
 extension AuthenticationViewModel {

Samples/Swift/DaysUntilBirthday/iOS/UserProfileView.swift

@@ -17,6 +17,27 @@
 import SwiftUI
 import GoogleSignIn
 
+/// A view that displays a list of ID token claims.
+struct ClaimsListView: View {
+  let claims: [Claim]
+  var body: some View {
+    List(claims) { claim in
+      VStack(alignment: .leading, spacing: 4) {
+        Text(claim.key)
+          .font(.caption)
+          .foregroundColor(.secondary)
+          .fontWeight(.semibold)
+
+        Text(claim.value)
+          .font(.body)
+          .lineLimit(4)
+      }
+      .padding(.vertical, 4)
+    }
+    .navigationTitle("ID Token Claims")
+  }
+}
+
 struct UserProfileView: View {
   @EnvironmentObject var authViewModel: AuthenticationViewModel
   @StateObject var birthdayViewModel = BirthdayViewModel()
@@ -35,8 +56,15 @@ struct UserProfileView: View {
               Text(userProfile.name)
                 .font(.headline)
               Text(userProfile.email)
-              if let authTimeString = authViewModel.formattedAuthTimeString {
-                Text("Last sign-in date: \(authTimeString)")
+
+              if !authViewModel.claims.isEmpty {
+                NavigationLink(destination: ClaimsListView(claims: authViewModel.claims)) {
+                  HStack {
+                    Image(systemName: "list.bullet.rectangle.portrait")
+                    Text("View ID Token Claims")
+                  }
+                  .foregroundColor(.blue)
+                }
               }
             }
           }