Add linkDomain support for ActionCodeSettting. This will generate Hosting-formatted email link.

FirebaseAuth/Sources/Swift/ActionCode/ActionCodeSettings.swift

@@ -42,6 +42,9 @@ import Foundation
   /// The Firebase Dynamic Link domain used for out of band code flow.
   @objc open var dynamicLinkDomain: String?
 
+  /// The out of band custom domain for handling code in app.
+  @objc open var linkDomain: String?
+
   /// Sets the iOS bundle ID.
   @objc override public init() {
     iOSBundleID = Bundle.main.bundleIdentifier

FirebaseAuth/Sources/Swift/Backend/AuthBackend.swift

@@ -449,6 +449,8 @@ private class AuthBackendRPCImplementation: AuthBackendImplementation {
       .missingAppCredential(message: serverDetailErrorMessage)
     case "INVALID_CODE": return AuthErrorUtils
       .invalidVerificationCodeError(message: serverDetailErrorMessage)
+    case "INVALID_HOSTING_LINK_DOMAIN": return AuthErrorUtils
+      .invalidHostingLinkDomainError(message: serverDetailErrorMessage)
     case "INVALID_SESSION_INFO": return AuthErrorUtils
       .invalidVerificationIDError(message: serverDetailErrorMessage)
     case "SESSION_EXPIRED": return AuthErrorUtils

FirebaseAuth/Sources/Swift/Backend/RPC/GetOOBConfirmationCodeRequest.swift

@@ -78,6 +78,9 @@ private let kCanHandleCodeInAppKey = "canHandleCodeInApp"
 /// The key for the "dynamic link domain" value in the request.
 private let kDynamicLinkDomainKey = "dynamicLinkDomain"
 
+/// The key for the "link domain" value in the request.
+private let kLinkDomainKey = "linkDomain"
+
 /// The value for the "PASSWORD_RESET" request type.
 private let kPasswordResetRequestTypeValue = "PASSWORD_RESET"
 
@@ -140,6 +143,9 @@ class GetOOBConfirmationCodeRequest: IdentityToolkitRequest, AuthRPCRequest {
   /// The Firebase Dynamic Link domain used for out of band code flow.
   private(set) var dynamicLinkDomain: String?
 
+  /// The Firebase Hosting domain used for out of band code flow.
+  private(set) var linkDomain: String?
+
   /// Response to the captcha.
   var captchaResponse: String?
 
@@ -172,6 +178,7 @@ class GetOOBConfirmationCodeRequest: IdentityToolkitRequest, AuthRPCRequest {
     androidInstallApp = actionCodeSettings?.androidInstallIfNotAvailable ?? false
     handleCodeInApp = actionCodeSettings?.handleCodeInApp ?? false
     dynamicLinkDomain = actionCodeSettings?.dynamicLinkDomain
+    linkDomain = actionCodeSettings?.linkDomain
 
     super.init(
       endpoint: kGetOobConfirmationCodeEndpoint,
@@ -274,6 +281,9 @@ class GetOOBConfirmationCodeRequest: IdentityToolkitRequest, AuthRPCRequest {
     if let dynamicLinkDomain {
       body[kDynamicLinkDomainKey] = dynamicLinkDomain
     }
+    if let linkDomain {
+      body[kLinkDomainKey] = linkDomain
+    }
     if let captchaResponse {
       body[kCaptchaResponseKey] = captchaResponse
     }

FirebaseAuth/Sources/Swift/Utilities/AuthErrorUtils.swift

@@ -366,6 +366,10 @@ class AuthErrorUtils {
     error(code: .invalidDynamicLinkDomain, message: message)
   }
 
+  static func invalidHostingLinkDomainError(message: String?) -> Error {
+    error(code: .invalidHostingLinkDomain, message: message)
+  }
+
   static func missingOrInvalidNonceError(message: String?) -> Error {
     error(code: .missingOrInvalidNonce, message: message)
   }

FirebaseAuth/Sources/Swift/Utilities/AuthErrors.swift

@@ -258,6 +258,9 @@ import Foundation
   /// unauthorized for the current project.
   case invalidDynamicLinkDomain = 17074
 
+  /// Indicates that the provided Firebase Hosting Link domain is not owned by the current project.
+  case invalidHostingLinkDomain = 17214
+
   /// Indicates that the credential is rejected because it's malformed or mismatching.
   case rejectedCredential = 17075
 
@@ -468,6 +471,8 @@ import Foundation
       return kErrorInvalidProviderID
     case .invalidDynamicLinkDomain:
       return kErrorInvalidDynamicLinkDomain
+    case .invalidHostingLinkDomain:
+      return kErrorInvalidHostingLinkDomain
     case .webInternalError:
       return kErrorWebInternalError
     case .webSignInUserInteractionFailure:
@@ -661,6 +666,8 @@ import Foundation
       return "ERROR_INVALID_PROVIDER_ID"
     case .invalidDynamicLinkDomain:
       return "ERROR_INVALID_DYNAMIC_LINK_DOMAIN"
+    case .invalidHostingLinkDomain:
+      return "ERROR_INVALID_HOSTING_LINK_DOMAIN"
     case .webInternalError:
       return "ERROR_WEB_INTERNAL_ERROR"
     case .webSignInUserInteractionFailure:
@@ -905,6 +912,9 @@ private let kErrorInvalidProviderID =
 private let kErrorInvalidDynamicLinkDomain =
   "The Firebase Dynamic Link domain used is either not configured or is unauthorized for the current project."
 
+private let kErrorInvalidHostingLinkDomain =
+  "The provided hosting link domain is not configured in Firebase Hosting or is not owned by the current project."
+
 private let kErrorInternalError =
   "An internal error has occurred, print and inspect the error details for more information."
 

FirebaseAuth/Tests/SampleSwift/AuthenticationExample/Models/AuthMenu.swift

@@ -43,6 +43,7 @@ enum AuthMenu: String {
   case deleteApp
   case actionType
   case continueURL
+  case linkDomain
   case requestVerifyEmail
   case requestPasswordReset
   case resetPassword
@@ -117,6 +118,8 @@ enum AuthMenu: String {
       return "Action Type"
     case .continueURL:
       return "Continue URL"
+    case .linkDomain:
+      return "Link Domain"
     case .requestVerifyEmail:
       return "Request Verify Email"
     case .requestPasswordReset:
@@ -197,6 +200,8 @@ enum AuthMenu: String {
       self = .actionType
     case "Continue URL":
       self = .continueURL
+    case "Link Domain":
+      self = .linkDomain
     case "Request Verify Email":
       self = .requestVerifyEmail
     case "Request Password Reset":
@@ -328,6 +333,7 @@ class AuthMenuData: DataSourceProvidable {
     let items: [Item] = [
       Item(title: AuthMenu.actionType.name, detailTitle: ActionCodeRequestType.inApp.name),
       Item(title: AuthMenu.continueURL.name, detailTitle: "--", isEditable: true),
+      Item(title: AuthMenu.linkDomain.name, detailTitle: "--", isEditable: true),
       Item(title: AuthMenu.requestVerifyEmail.name),
       Item(title: AuthMenu.requestPasswordReset.name),
       Item(title: AuthMenu.resetPassword.name),

FirebaseAuth/Tests/SampleSwift/AuthenticationExample/ViewControllers/AccountLinkingViewController.swift

@@ -354,6 +354,9 @@ class AccountLinkingViewController: UIViewController, DataSourceProviderDelegate
   /// Similar to in `PasswordlessViewController`, enter the authorized domain.
   /// Please refer to this Quickstart's README for more information.
   private let authorizedDomain: String = "ENTER AUTHORIZED DOMAIN"
+
+  /// This is the replacement for customized dynamic link domain.
+  private let customDomain: String = "ENTER AUTHORIZED HOSTING DOMAIN"
   /// Maintain a reference to the email entered for linking user to Passwordless.
   private var email: String?
 
@@ -380,6 +383,7 @@ class AccountLinkingViewController: UIViewController, DataSourceProviderDelegate
     // The sign-in operation must be completed in the app.
     actionCodeSettings.handleCodeInApp = true
     actionCodeSettings.setIOSBundleID(Bundle.main.bundleIdentifier!)
+    actionCodeSettings.linkDomain = customDomain
 
     AppManager.shared.auth()
       .sendSignInLink(toEmail: email, actionCodeSettings: actionCodeSettings) { error in

FirebaseAuth/Tests/SampleSwift/AuthenticationExample/ViewControllers/AuthViewController.swift

@@ -39,6 +39,7 @@ class AuthViewController: UIViewController, DataSourceProviderDelegate {
   var authStateDidChangeListeners: [AuthStateDidChangeListenerHandle] = []
   var IDTokenDidChangeListeners: [IDTokenDidChangeListenerHandle] = []
   var actionCodeContinueURL: URL?
+  var actionCodeLinkDomain: String?
   var actionCodeRequestType: ActionCodeRequestType = .inApp
 
   let spinner = UIActivityIndicatorView(style: .medium)
@@ -69,6 +70,7 @@ class AuthViewController: UIViewController, DataSourceProviderDelegate {
     let settings = ActionCodeSettings()
     settings.url = actionCodeContinueURL
     settings.handleCodeInApp = (actionCodeRequestType == .inApp)
+    settings.linkDomain = actionCodeLinkDomain
     return settings
   }
 
@@ -156,6 +158,9 @@ class AuthViewController: UIViewController, DataSourceProviderDelegate {
     case .continueURL:
       changeActionCodeContinueURL(at: indexPath)
 
+    case .linkDomain:
+      changeActionCodeLinkDomain(at: indexPath)
+
     case .requestVerifyEmail:
       requestVerifyEmail()
 
@@ -552,7 +557,7 @@ class AuthViewController: UIViewController, DataSourceProviderDelegate {
   private func changeActionCodeContinueURL(at indexPath: IndexPath) {
     showTextInputPrompt(with: "Continue URL:", completion: { newContinueURL in
       self.actionCodeContinueURL = URL(string: newContinueURL)
-      print("Successfully set Continue URL  to: \(newContinueURL)")
+      print("Successfully set Continue URL to: \(newContinueURL)")
       self.dataSourceProvider.updateItem(
         at: indexPath,
         item: Item(
@@ -565,6 +570,22 @@ class AuthViewController: UIViewController, DataSourceProviderDelegate {
     })
   }
 
+  private func changeActionCodeLinkDomain(at indexPath: IndexPath) {
+    showTextInputPrompt(with: "Link Domain:", completion: { newLinkDomain in
+      self.actionCodeLinkDomain = newLinkDomain
+      print("Successfully set Link Domain to: \(newLinkDomain)")
+      self.dataSourceProvider.updateItem(
+        at: indexPath,
+        item: Item(
+          title: AuthMenu.linkDomain.name,
+          detailTitle: self.actionCodeLinkDomain,
+          isEditable: true
+        )
+      )
+      self.tableView.reloadData()
+    })
+  }
+
   private func requestVerifyEmail() {
     showSpinner()
     let completionHandler: ((any Error)?) -> Void = { [weak self] error in

FirebaseAuth/Tests/SampleSwift/AuthenticationExample/ViewControllers/OtherAuthMethodControllers/PasswordlessViewController.swift

@@ -31,7 +31,10 @@ class PasswordlessViewController: OtherAuthViewController {
 
   // MARK: - Firebase 🔥
 
-  private let authorizedDomain: String = "ENTER AUTHORIZED DOMAIN"
+  private let authorizedDomain: String =
+    "fir-ios-auth-sample.firebaseapp.com" // Enter AUTHORIZED_DOMAIN
+  private let customDomain: String =
+    "firebaseiosauthsample.testdomaindonotuse.com" // Enter AUTHORIZED_HOSTING_DOMAIN
 
   private func sendSignInLink(to email: String) {
     let actionCodeSettings = ActionCodeSettings()
@@ -42,6 +45,7 @@ class PasswordlessViewController: OtherAuthViewController {
     // The sign-in operation must be completed in the app.
     actionCodeSettings.handleCodeInApp = true
     actionCodeSettings.setIOSBundleID(Bundle.main.bundleIdentifier!)
+    actionCodeSettings.linkDomain = customDomain
 
     AppManager.shared.auth()
       .sendSignInLink(toEmail: email, actionCodeSettings: actionCodeSettings) { error in

FirebaseAuth/Tests/SampleSwift/AuthenticationExampleUITests/AuthenticationExampleUITests.swift

@@ -226,6 +226,89 @@ class AuthenticationExampleUITests: XCTestCase {
     removeUIInterruptionMonitor(interruptionMonitor)
   }
 
+  func testEmailLinkSentSuccessfully() {
+    app.staticTexts["Email Link/Passwordless"].tap()
+
+    let testEmail = "test@test.com"
+    app.textFields["Enter Authentication Email"].tap()
+    app.textFields["Enter Authentication Email"].typeText(testEmail)
+    app.buttons["return"].tap() // Dismiss keyboard
+    app.buttons["Send Sign In Link"].tap()
+
+    // Wait for the error message to appear (if there is an error)
+    let errorAlert = app.alerts.staticTexts["Error"]
+    let errorExists = errorAlert.waitForExistence(timeout: 5.0)
+
+    app.swipeDown(velocity: .fast)
+
+    // Assert that there is no error message (success case)
+    // The email sign in link is sent successfully if no error message appears
+    XCTAssertFalse(errorExists, "Error")
+
+    // Go back and check that there is no user that is signed in
+    app.tabBars.firstMatch.buttons.element(boundBy: 1).tap()
+    wait(forElement: app.navigationBars["User"], timeout: 5.0)
+    XCTAssertEqual(
+      app.cells.count,
+      0,
+      "The user shouldn't be signed in and the user view should have no cells."
+    )
+  }
+
+  func testResetPasswordLinkCustomDomain() {
+    // assuming action type is in-app + continue URL everytime the app launches
+
+    // set Authorized Domain as Continue URL
+    let testContinueURL = "fir-ios-auth-sample.firebaseapp.com"
+    app.staticTexts["Continue URL"].tap()
+    app.alerts.textFields.element.typeText(testContinueURL)
+    app.buttons["Save"].tap()
+
+    // set Custom Hosting Domain as Link Domain
+    let testLinkDomain = "http://firebaseiosauthsample.testdomaindonotuse.com"
+    app.staticTexts["Link Domain"].tap()
+    app.alerts.textFields.element.typeText(testLinkDomain)
+    app.buttons["Save"].tap()
+
+    app.staticTexts["Request Password Reset"].tap()
+    let testEmail = "test@test.com"
+    app.alerts.textFields.element.typeText(testEmail)
+    app.buttons["Save"].tap()
+
+    // Go back and check that there is no user that is signed in
+    app.tabBars.firstMatch.buttons.element(boundBy: 1).tap()
+    wait(forElement: app.navigationBars["User"], timeout: 5.0)
+    XCTAssertEqual(
+      app.cells.count,
+      0,
+      "The user shouldn't be signed in and the user view should have no cells."
+    )
+  }
+
+  func testResetPasswordLinkDefaultDomain() {
+    // assuming action type is in-app + continue URL everytime the app launches
+
+    // set Authorized Domain as Continue URL
+    let testContinueURL = "fir-ios-auth-sample.firebaseapp.com"
+    app.staticTexts["Continue URL"].tap()
+    app.alerts.textFields.element.typeText(testContinueURL)
+    app.buttons["Save"].tap()
+
+    app.staticTexts["Request Password Reset"].tap()
+    let testEmail = "test@test.com"
+    app.alerts.textFields.element.typeText(testEmail)
+    app.buttons["Save"].tap()
+
+    // Go back and check that there is no user that is signed in
+    app.tabBars.firstMatch.buttons.element(boundBy: 1).tap()
+    wait(forElement: app.navigationBars["User"], timeout: 5.0)
+    XCTAssertEqual(
+      app.cells.count,
+      0,
+      "The user shouldn't be signed in and the user view should have no cells."
+    )
+  }
+
   // MARK: - Private Helpers
 
   private func signOut() {

FirebaseAuth/Tests/Unit/GetOOBConfirmationCodeTests.swift

@@ -34,6 +34,7 @@ class GetOOBConfirmationCodeTests: RPCBaseTests {
   private let kAndroidMinimumVersionKey = "androidMinimumVersion"
   private let kCanHandleCodeInAppKey = "canHandleCodeInApp"
   private let kDynamicLinkDomainKey = "dynamicLinkDomain"
+  private let kLinkDomainKey = "linkDomain"
   private let kExpectedAPIURL =
     "https://www.googleapis.com/identitytoolkit/v3/relyingparty/getOobConfirmationCode?key=APIKey"
   private let kOOBCodeKey = "oobCode"
@@ -66,6 +67,7 @@ class GetOOBConfirmationCodeTests: RPCBaseTests {
       XCTAssertEqual(decodedRequest[kAndroidInstallAppKey] as? Bool, true)
       XCTAssertEqual(decodedRequest[kCanHandleCodeInAppKey] as? Bool, true)
       XCTAssertEqual(decodedRequest[kDynamicLinkDomainKey] as? String, kDynamicLinkDomain)
+      XCTAssertEqual(decodedRequest[kLinkDomainKey] as? String, kLinkDomain)
     }
   }
 
@@ -110,6 +112,7 @@ class GetOOBConfirmationCodeTests: RPCBaseTests {
       XCTAssertEqual(decodedRequest[kAndroidInstallAppKey] as? Bool, true)
       XCTAssertEqual(decodedRequest[kCanHandleCodeInAppKey] as? Bool, true)
       XCTAssertEqual(decodedRequest[kDynamicLinkDomainKey] as? String, kDynamicLinkDomain)
+      XCTAssertEqual(decodedRequest[kLinkDomainKey] as? String, kLinkDomain)
       XCTAssertEqual(decodedRequest[kCaptchaResponseKey] as? String, kTestCaptchaResponse)
       XCTAssertEqual(decodedRequest[kClientTypeKey] as? String, kTestClientType)
       XCTAssertEqual(decodedRequest[kRecaptchaVersionKey] as? String, kTestRecaptchaVersion)

FirebaseAuth/Tests/Unit/ObjCAPITests.m

@@ -65,6 +65,7 @@ - (void)FIRActionCodeSettings_h {
   s = [codeSettings androidPackageName];
   s = [codeSettings androidMinimumVersion];
   s = [codeSettings dynamicLinkDomain];
+  s = [codeSettings linkDomain];
 }
 
 - (void)FIRAuthAdditionalUserInfo_h:(FIRAdditionalUserInfo *)additionalUserInfo {
@@ -280,6 +281,7 @@ - (void)FIRAuthErrors_h {
   c = FIRAuthErrorCodeTenantIDMismatch;
   c = FIRAuthErrorCodeUnsupportedTenantOperation;
   c = FIRAuthErrorCodeInvalidDynamicLinkDomain;
+  c = FIRAuthErrorCodeInvalidHostingLinkDomain;
   c = FIRAuthErrorCodeRejectedCredential;
   c = FIRAuthErrorCodeGameKitNotLinked;
   c = FIRAuthErrorCodeSecondFactorRequired;

FirebaseAuth/Tests/Unit/RPCBaseTests.swift

@@ -38,6 +38,7 @@ class RPCBaseTests: XCTestCase {
   let kAndroidPackageName = "androidpackagename"
   let kAndroidMinimumVersion = "3.0"
   let kDynamicLinkDomain = "test.page.link"
+  let kLinkDomain = "link.firebaseapp.com"
   let kTestPhotoURL = "https://host.domain/image"
   let kCreationDateTimeIntervalInSeconds = 1_505_858_500.0
   let kLastSignInDateTimeIntervalInSeconds = 1_505_858_583.0
@@ -304,6 +305,7 @@ class RPCBaseTests: XCTestCase {
     settings.handleCodeInApp = true
     settings.url = URL(string: kContinueURL)
     settings.dynamicLinkDomain = kDynamicLinkDomain
+    settings.linkDomain = kLinkDomain
     return settings
   }
 

FirebaseAuth/Tests/Unit/SwiftAPI.swift

@@ -41,7 +41,8 @@ class AuthAPI_hOnlyTests: XCTestCase {
        let _: String = codeSettings.iOSBundleID,
        let _: String = codeSettings.androidPackageName,
        let _: String = codeSettings.androidMinimumVersion,
-       let _: String = codeSettings.dynamicLinkDomain {}
+       let _: String = codeSettings.dynamicLinkDomain,
+       let _: String = codeSettings.linkDomain {}
   }
 
   @available(iOS 13, tvOS 13, macOS 10.15, macCatalyst 13, watchOS 7, *)
@@ -276,6 +277,7 @@ class AuthAPI_hOnlyTests: XCTestCase {
     _ = AuthErrorCode.tenantIDMismatch
     _ = AuthErrorCode.unsupportedTenantOperation
     _ = AuthErrorCode.invalidDynamicLinkDomain
+    _ = AuthErrorCode.invalidHostingLinkDomain
     _ = AuthErrorCode.rejectedCredential
     _ = AuthErrorCode.gameKitNotLinked
     _ = AuthErrorCode.secondFactorRequired