[SIWA] Log In: add 'Continue with Apple' button to login options

WordPressAuthenticator.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name          = "WordPressAuthenticator"
-  s.version       = "1.8.0-beta.2"
+  s.version       = "1.8.0-beta.3"
   s.summary       = "WordPressAuthenticator implements an easy and elegant way to authenticate your WordPress Apps."
 
   s.description   = <<-DESC

WordPressAuthenticator/Authenticator/WordPressAuthenticatorConfiguration.swift

@@ -56,6 +56,10 @@ public struct WordPressAuthenticatorConfiguration {
     /// and verified.
     ///
     let showLoginOptionsFromSiteAddress: Bool
+
+    /// Flag indicating if the Sign In With Apple option should be displayed.
+    ///
+    let enableSignInWithApple: Bool
 
     /// Designated Initializer
     ///
@@ -70,7 +74,8 @@ public struct WordPressAuthenticatorConfiguration {
                  googleLoginScheme: String,
                  userAgent: String,
                  showNewLoginFlow: Bool = false,
-                 showLoginOptionsFromSiteAddress: Bool = false) {
+                 showLoginOptionsFromSiteAddress: Bool = false,
+                 enableSignInWithApple: Bool = false) {
 
         self.wpcomClientId = wpcomClientId
         self.wpcomSecret = wpcomSecret
@@ -84,5 +89,6 @@ public struct WordPressAuthenticatorConfiguration {
         self.userAgent = userAgent
         self.showNewLoginFlow = showNewLoginFlow
         self.showLoginOptionsFromSiteAddress = showLoginOptionsFromSiteAddress
+        self.enableSignInWithApple = enableSignInWithApple
     }
 }

WordPressAuthenticator/Extensions/WPStyleGuide+Login.swift

@@ -1,6 +1,7 @@
 import WordPressShared
 import WordPressUI
 import Gridicons
+import AuthenticationServices
 
 final class SubheadlineButton: UIButton {
     override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
@@ -16,7 +17,10 @@ final class SubheadlineButton: UIButton {
 extension WPStyleGuide {
 
     private struct Constants {
-        static let buttonMinHeight: CGFloat = 40.0
+        // This matches the button height in NUXButtonView.storyboard
+        static let buttonMinHeight: CGFloat = 50.0
+
+        static let textButtonMinHeight: CGFloat = 40.0
         static let googleIconOffset: CGFloat = -1.0
         static let domainsIconPaddingToRemove: CGFloat = 2.0
         static let domainsIconSize = CGSize(width: 18, height: 18)
@@ -112,6 +116,24 @@ extension WPStyleGuide {
         return textButton(normal: attrStrNormal, highlighted: attrStrHighlight, font: font)
     }
 
+    /// Creates a button for Apple Sign-in
+    ///
+    /// - Returns: A properly styled UIControl
+    ///
+
+    class func appleLoginButton() -> UIControl {
+        #if XCODE11
+        if #available(iOS 13.0, *) {
+            let appleButton = ASAuthorizationAppleIDButton(authorizationButtonType: .continue, authorizationButtonStyle: .black)
+            appleButton.translatesAutoresizingMaskIntoConstraints = false
+            appleButton.heightAnchor.constraint(greaterThanOrEqualToConstant: Constants.buttonMinHeight).isActive = true
+            return appleButton
+        }
+        #endif
+
+        return UIControl()
+    }
+
     /// Creates a button for Self-hosted Login
     ///
     /// - Returns: A properly styled UIButton
@@ -189,7 +211,7 @@ extension WPStyleGuide {
         // for the titleLabel's height.
         button.titleLabel?.topAnchor.constraint(equalTo: button.topAnchor, constant: Constants.verticalLabelSpacing).isActive = true
         button.titleLabel?.bottomAnchor.constraint(equalTo: button.bottomAnchor, constant: -Constants.verticalLabelSpacing).isActive = true
-        button.heightAnchor.constraint(greaterThanOrEqualToConstant: Constants.buttonMinHeight).isActive = true
+        button.heightAnchor.constraint(greaterThanOrEqualToConstant: Constants.textButtonMinHeight).isActive = true
 
 
         button.setAttributedTitle(normalString, for: .normal)

WordPressAuthenticator/Signin/LoginPrologueLoginMethodViewController.swift

@@ -11,6 +11,7 @@ class LoginPrologueLoginMethodViewController: NUXViewController {
     open var emailTapped: (() -> Void)?
     open var googleTapped: (() -> Void)?
     open var selfHostedTapped: (() -> Void)?
+    open var appleTapped: (() -> Void)?
 
     override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
         super.prepare(for: segue, sender: sender)
@@ -34,15 +35,14 @@ class LoginPrologueLoginMethodViewController: NUXViewController {
         guard let buttonViewController = buttonViewController else {
             return
         }
-
-        let wordpressTitle = NSLocalizedString("Continue with WordPress.com", comment: "Button title. Tapping begins our normal log in process.")
-        let googleTitle = NSLocalizedString("Continue with Google", comment: "Button title. Tapping begins log in using Google.")
 
+        let wordpressTitle = NSLocalizedString("Continue with WordPress.com", comment: "Button title. Tapping begins our normal log in process.")
         buttonViewController.setupTopButton(title: wordpressTitle, isPrimary: false, accessibilityIdentifier: "Log in with Email Button") { [weak self] in
             self?.dismiss(animated: true)
             self?.emailTapped?()
         }
 
+        let googleTitle = NSLocalizedString("Continue with Google", comment: "Button title. Tapping begins log in using Google.")
         buttonViewController.setupBottomButton(title: googleTitle, isPrimary: false, accessibilityIdentifier: "Log in with Google Button") { [weak self] in
             defer {
                 WordPressAuthenticator.track(.loginSocialButtonClick)
@@ -58,6 +58,16 @@ class LoginPrologueLoginMethodViewController: NUXViewController {
             selfHostedLoginButton.addTarget(self, action: #selector(handleSelfHostedButtonTapped), for: .touchUpInside)
         }
 
+        if WordPressAuthenticator.shared.configuration.enableSignInWithApple {
+            #if XCODE11
+            if #available(iOS 13.0, *) {
+                let appleButton = WPStyleGuide.appleLoginButton()
+                appleButton.addTarget(self, action: #selector(handleAppleButtonTapped), for: .touchDown)
+                buttonViewController.stackView?.insertArrangedSubview(appleButton, at: 0)
+            }
+            #endif
+        }
+
         buttonViewController.backgroundColor = WordPressAuthenticator.shared.style.viewControllerBackgroundColor
     }
 
@@ -70,4 +80,9 @@ class LoginPrologueLoginMethodViewController: NUXViewController {
         selfHostedTapped?()
     }
 
+    @objc func handleAppleButtonTapped() {
+        dismiss(animated: true)
+        appleTapped?()
+    }
+
 }

WordPressAuthenticator/Signin/LoginPrologueViewController.swift

@@ -66,7 +66,10 @@ class LoginPrologueViewController: LoginViewController {
             vc.selfHostedTapped = { [weak self] in
                 self?.performSegue(withIdentifier: NUXViewController.SegueIdentifier.showSelfHostedLogin.rawValue, sender: self)
             }
-
+            vc.appleTapped = { [weak self] in
+                self?.appleTapped()
+            }
+
             vc.modalPresentationStyle = .custom
         }
     }
@@ -110,4 +113,9 @@ class LoginPrologueViewController: LoginViewController {
         WordPressAuthenticator.track(.signupButtonTapped)
         performSegue(withIdentifier: NUXViewController.SegueIdentifier.showSignupMethod.rawValue, sender: self)
     }
+
+    private func appleTapped() {
+        print("Login Prologue: Apple tapped.")
+    }
+
 }

WordPressAuthenticator/Signin/LoginSiteAddressViewController.swift

@@ -277,11 +277,18 @@ class LoginSiteAddressViewController: LoginViewController, NUXKeyboardResponder
             vc.googleTapped = { [weak self] in
                 self?.performSegue(withIdentifier: .showGoogle, sender: self)
             }
+            vc.appleTapped = { [weak self] in
+                self?.appleTapped()
+            }
 
             vc.modalPresentationStyle = .custom
         }
     }
-
+
+    private func appleTapped() {
+        print("Login Site Address: Apple tapped.")
+    }
+
     /// Whether the form can be submitted.
     ///
     @objc func canSubmit() -> Bool {
@@ -322,7 +329,6 @@ class LoginSiteAddressViewController: LoginViewController, NUXKeyboardResponder
         }
     }
 
-
     @IBAction func handleSubmitButtonTapped(_ sender: UIButton) {
         validateForm()
     }