Add preliminary web authentication support

Sources/SafariUI/DismissButtonStyle.swift

@@ -49,7 +49,5 @@ public extension SafariView {
             case .cancel: return .cancel
             }
         }
-
     }
-
 }

Sources/SafariUI/Environment.swift

@@ -91,6 +91,11 @@ extension EnvironmentValues {
         set { self[SafariViewDismissButtonStyleEnvironmentKey.self] = newValue }
     }
 
+    var webAuthenticationPrefersEphemeralWebBrowserSession: Bool {
+        get { self[WebAuthenticationPrefersEphemeralWebBrowserSessionEnvironmentKey.self] }
+        set { self[WebAuthenticationPrefersEphemeralWebBrowserSessionEnvironmentKey.self] = newValue }
+    }
+
 }
 
 private struct SafariViewEntersReaderIfAvailableEnvironmentKey: EnvironmentKey {
@@ -162,3 +167,11 @@ private struct SafariViewExcludedActivityTypesEnvironmentKey: EnvironmentKey {
     static let defaultValue: Value = .default
 
 }
+
+private struct WebAuthenticationPrefersEphemeralWebBrowserSessionEnvironmentKey: EnvironmentKey {
+
+    typealias Value = Bool
+
+    static let defaultValue: Bool = false
+
+}

Sources/SafariUI/Modifiers.swift

@@ -202,6 +202,11 @@ public extension View {
         return ModifiedContent(content: self, modifier: modifier)
     }
 
+    func webAuthenticationPrefersEphemeralWebBrowserSession(_ prefersEphemeralWebBrowserSession: Bool = true) -> some View {
+        let modifer = WebAuthenticationPrefersEphemeralWebBrowserSessionModifier(prefersEphemeralWebBrowserSession: prefersEphemeralWebBrowserSession)
+        return ModifiedContent(content: self, modifier: modifer)
+    }
+
 }
 
 private struct SafariViewEntersReaderIfAvailableModifier: ViewModifier {
@@ -343,7 +348,7 @@ private struct SafariViewExcludedActivityTypesModifier: ViewModifier {
         self.activityTypes = activityTypes
     }
 
-    // MARK: - ViewBuilder
+    // MARK: - ViewModifier
 
     @ViewBuilder
     func body(content: Content) -> some View {
@@ -356,3 +361,24 @@ private struct SafariViewExcludedActivityTypesModifier: ViewModifier {
     private let activityTypes: SafariView.ExcludedActivityTypes
 
 }
+
+private struct WebAuthenticationPrefersEphemeralWebBrowserSessionModifier: ViewModifier {
+
+    // MARK: - Initializers
+
+    init(prefersEphemeralWebBrowserSession: Bool) {
+        self.prefersEphemeralWebBrowserSession = prefersEphemeralWebBrowserSession
+    }
+
+    // MARK: - ViewModifier
+
+    @ViewBuilder
+    func body(content: Content) -> some View {
+        content
+            .environment(\.webAuthenticationPrefersEphemeralWebBrowserSession, prefersEphemeralWebBrowserSession)
+    }
+
+    // MARK: - Private
+
+    private let prefersEphemeralWebBrowserSession: Bool
+}

Sources/SafariUI/Presentation.swift

@@ -274,3 +274,15 @@ public extension View {
         )
     }
 }
+
+public extension View {
+
+    func webAuthentication<Item>(
+        _ item: Binding<Item?>,
+        webAuthentication: @escaping (Item) -> WebAuthentication
+    ) -> some View where Item: Identifiable {
+        let modifier = WebAuthentication.IdentifiableItemModitifer(item: item, build: webAuthentication)
+        return ModifiedContent(content: self, modifier: modifier)
+    }
+
+}

Sources/SafariUI/SafariView.swift

@@ -699,7 +699,7 @@ public struct SafariView: View {
 
 }
 
-private extension UIView {
+extension UIView {
 
     var controller: UIViewController? {
         if let nextResponder = next as? UIViewController {