[local_auth] Issue 166413 ios stop authentication

packages/local_auth/local_auth/example/pubspec.yaml

@@ -28,3 +28,7 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+# FOR TESTING AND INITIAL REVIEW ONLY. DO NOT MERGE.
+# See https://github.com/flutter/flutter/blob/master/docs/ecosystem/contributing/README.md#changing-federated-plugins
+dependency_overrides:
+  local_auth_darwin: {path: ../../../../packages/local_auth/local_auth_darwin}

packages/local_auth/local_auth/pubspec.yaml

@@ -38,3 +38,7 @@ topics:
   - authentication
   - biometrics
   - local-auth
+# FOR TESTING AND INITIAL REVIEW ONLY. DO NOT MERGE.
+# See https://github.com/flutter/flutter/blob/master/docs/ecosystem/contributing/README.md#changing-federated-plugins
+dependency_overrides:
+  local_auth_darwin: {path: ../../../packages/local_auth/local_auth_darwin}

packages/local_auth/local_auth_darwin/CHANGELOG.md

@@ -1,5 +1,6 @@
-## NEXT
+## 2.1.0
 
+* Add `stopAuthentication` implementation.
 * Updates minimum supported SDK version to Flutter 3.38/Dart 3.10.
 
 ## 2.0.3

packages/local_auth/local_auth_darwin/darwin/Tests/FLALocalAuthPluginTests.swift

@@ -48,6 +48,9 @@ final class StubAuthContext: NSObject, AuthContext, @unchecked Sendable {
   var biometryType: LABiometryType = .none
   var localizedFallbackTitle: String?
 
+  /// Tracks if invalidate() was called during the test.
+  var invalidated = false
+
   func canEvaluatePolicy(_ policy: LAPolicy, error: NSErrorPointer) -> Bool {
     #expect(
       policy
@@ -75,6 +78,8 @@ final class StubAuthContext: NSObject, AuthContext, @unchecked Sendable {
       reply(self.evaluateResponse, self.evaluateError)
     }
   }
+
+  func invalidate() { invalidated = true }
 }
 
 // MARK: -
@@ -454,6 +459,53 @@ struct LocalAuthPluginTests {
     #expect(!result)
   }
 
+  @Test
+  func stopAuthenticationHandlesNoActiveContext() async {
+    let stubAuthContext = StubAuthContext()
+    let plugin = LocalAuthPlugin(
+      contextFactory: StubAuthContextFactory(contexts: [stubAuthContext]))
+
+    let result = await withCheckedContinuation { continuation in
+      plugin.stopAuthentication { response in
+        switch response {
+        case .success(let val):
+          continuation.resume(returning: val)
+        case .failure:
+          continuation.resume(returning: false)
+        }
+      }
+    }
+
+    #expect(!result)
+    #expect(!stubAuthContext.invalidated)
+  }
+
+  @Test
+  func stopAuthenticationHandlesActiveContext() async {
+    let stubAuthContext = StubAuthContext()
+    let plugin = LocalAuthPlugin(
+      contextFactory: StubAuthContextFactory(contexts: [stubAuthContext]))
+
+    plugin.authenticate(
+      options: AuthOptions(biometricOnly: false, sticky: false),
+      strings: createAuthStrings()
+    ) { _ in }
+
+    let result = await withCheckedContinuation { continuation in
+      plugin.stopAuthentication { response in
+        switch response {
+        case .success(let val):
+          continuation.resume(returning: val)
+        case .failure:
+          continuation.resume(returning: false)
+        }
+      }
+    }
+
+    #expect(result)
+    #expect(stubAuthContext.invalidated)
+  }
+
   // Creates an AuthStrings with placeholder values.
   func createAuthStrings(localizedFallbackTitle: String? = nil) -> AuthStrings {
     return AuthStrings(

packages/local_auth/local_auth_darwin/darwin/local_auth_darwin/Sources/local_auth_darwin/LocalAuthPlugin.swift

@@ -39,6 +39,8 @@ public final class LocalAuthPlugin: NSObject, FlutterPlugin, LocalAuthApi, @unch
   private let authContextFactory: AuthContextFactory
   /// Manages the last call state for sticky auth.
   private var lastCallState: StickyAuthState?
+  /// The active context for the current authentication session.
+  private var activeContext: AuthContext?
 
   public static func register(with registrar: FlutterPluginRegistrar) {
     let instance = LocalAuthPlugin(
@@ -74,6 +76,7 @@ public final class LocalAuthPlugin: NSObject, FlutterPlugin, LocalAuthApi, @unch
     completion: @escaping (Result<AuthResultDetails, Error>) -> Void
   ) {
     var context = authContextFactory.createAuthContext()
+    activeContext = context
     lastCallState = nil
     context.localizedFallbackTitle = strings.localizedFallbackTitle
 
@@ -88,6 +91,11 @@ public final class LocalAuthPlugin: NSObject, FlutterPlugin, LocalAuthApi, @unch
         localizedReason: strings.reason
       ) { [weak self] (success: Bool, error: Error?) in
         DispatchQueue.main.async {
+          if let currentActive = self?.activeContext,
+            currentActive as AnyObject === context as AnyObject
+          {
+            self?.activeContext = nil
+          }
           self?.handleAuthReply(
             success: success,
             error: error,
@@ -97,6 +105,7 @@ public final class LocalAuthPlugin: NSObject, FlutterPlugin, LocalAuthApi, @unch
         }
       }
     } else {
+      activeContext = nil
       if let authError = authError {
         self.handleError(authError, options: options, strings: strings, completion: completion)
       } else {
@@ -159,6 +168,17 @@ public final class LocalAuthPlugin: NSObject, FlutterPlugin, LocalAuthApi, @unch
     return context.canEvaluatePolicy(.deviceOwnerAuthentication, error: nil)
   }
 
+  func stopAuthentication(completion: @escaping (Result<Bool, any Error>) -> Void) {
+    guard let context = activeContext else {
+      completion(.success(false))
+      return
+    }
+
+    context.invalidate()
+    activeContext = nil
+    completion(.success(true))
+  }
+
   // MARK: Private Methods
 
   private func handleAuthReply(

packages/local_auth/local_auth_darwin/darwin/local_auth_darwin/Sources/local_auth_darwin/SystemWrappers.swift

@@ -33,6 +33,9 @@ protocol AuthContext {
     localizedReason: String,
     reply: @escaping @Sendable (Bool, Error?) -> Void
   )
+
+  /// Direct passthrough to LAContext's invalidate.
+  func invalidate()
 }
 
 /// AuthContext is intentionally a direct passthroguh to LAContext.