[MBL-1194] Implement Validate Checkout

Kickstarter-iOS/Features/PledgeView/Controllers/PostCampaignCheckoutViewController.swift

@@ -10,14 +10,17 @@ private enum PostCampaignCheckoutLayout {
   }
 }
 
-final class PostCampaignCheckoutViewController: UIViewController {
+final class PostCampaignCheckoutViewController: UIViewController, MessageBannerViewControllerPresenting {
   // MARK: - Properties
 
+  internal var messageBannerViewController: MessageBannerViewController?
+
   private lazy var titleLabel = UILabel(frame: .zero)
 
   private lazy var paymentMethodsViewController = {
     PledgePaymentMethodsViewController.instantiate()
-    // TODO: Add self as delegate and add support for delegate methods.
+      |> \.messageDisplayingDelegate .~ self
+      |> \.delegate .~ self
   }()
 
   private lazy var pledgeCTAContainerView: PledgeViewCTAContainerView = {
@@ -72,6 +75,8 @@ final class PostCampaignCheckoutViewController: UIViewController {
 
     self.title = Strings.Back_this_project()
 
+    self.messageBannerViewController = self.configureMessageBannerViewController(on: self)
+
     self.configureChildViewControllers()
     self.setupConstraints()
 
@@ -199,6 +204,20 @@ final class PostCampaignCheckoutViewController: UIViewController {
         self.presentHelpWebViewController(with: helpType, presentationStyle: .formSheet)
       }
 
+    self.viewModel.outputs.validateCheckoutSuccess
+      .observeForControllerAction()
+      .observeValues { [weak self] _ in
+        guard let self else { return }
+
+        // TODO: Confirm paymentIntent using Stripe.confirmPayment()
+      }
+
+    self.viewModel.outputs.showErrorBannerWithMessage
+      .observeForControllerAction()
+      .observeValues { [weak self] errorMessage in
+        self?.messageBannerViewController?.showBanner(with: .error, message: errorMessage)
+      }
+
     self.sessionStartedObserver = NotificationCenter.default
       .addObserver(forName: .ksr_sessionStarted, object: nil, queue: nil) { [weak self] _ in
         self?.viewModel.inputs.userSessionStarted()
@@ -253,11 +272,61 @@ extension PostCampaignCheckoutViewController: PledgeViewCTAContainerViewDelegate
 
   func submitButtonTapped() {
     self.paymentMethodsViewController.cancelModalPresentation(true)
-    // TODO: Respond to button tap
+    self.viewModel.inputs.submitButtonTapped()
   }
 
   func termsOfUseTapped(with helpType: HelpType) {
     self.paymentMethodsViewController.cancelModalPresentation(true)
     self.viewModel.inputs.termsOfUseTapped(with: helpType)
   }
 }
+
+// MARK: - PledgePaymentMethodsViewControllerDelegate
+
+extension PostCampaignCheckoutViewController: PledgePaymentMethodsViewControllerDelegate {
+  func pledgePaymentMethodsViewController(
+    _: PledgePaymentMethodsViewController,
+    didSelectCreditCard paymentSource: PaymentSourceSelected
+  ) {
+    switch paymentSource {
+    case let .paymentIntentClientSecret(clientSecret):
+      return STPAPIClient.shared.retrievePaymentIntent(withClientSecret: clientSecret) { intent, _ in
+        guard let intent = intent else {
+          self.messageBannerViewController?
+            .showBanner(with: .error, message: Strings.Something_went_wrong_please_try_again())
+          return
+        }
+
+        let stripeCardId = intent.stripeId
+        let paymentIntentClientSecret = paymentSource.paymentIntentClientSecret ?? ""
+
+        self.viewModel.inputs.creditCardSelected(with: (stripeCardId, paymentIntentClientSecret))
+      }
+    default:
+      break
+    }
+  }
+}
+
+// MARK: - PledgeViewControllerMessageDisplaying
+
+extension PostCampaignCheckoutViewController: PledgeViewControllerMessageDisplaying {
+  func pledgeViewController(_: UIViewController, didErrorWith message: String) {
+    self.messageBannerViewController?.showBanner(with: .error, message: message)
+  }
+
+  func pledgeViewController(_: UIViewController, didSucceedWith message: String) {
+    self.messageBannerViewController?.showBanner(with: .success, message: message)
+  }
+}
+
+extension PostCampaignCheckoutViewController: MessageBannerViewControllerDelegate {
+  func messageBannerViewDidHide(type: MessageBannerType) {
+    switch type {
+    case .error:
+      self.navigationController?.popViewController(animated: true)
+    default:
+      break
+    }
+  }
+}

Library/ViewModels/ConfirmDetailsViewModel.swift

@@ -353,7 +353,16 @@ public class ConfirmDetailsViewModel: ConfirmDetailsViewModelType, ConfirmDetail
       }
 
     let checkoutValues = createCheckoutEvents.values()
-      .map { $0.checkout.id }
+      .map { values in
+        var checkoutId: String?
+
+        if let decoded = decodeBase64(values.checkout.id), let range = decoded.range(of: "Checkout-") {
+          let id = decoded[range.upperBound...]
+          checkoutId = String(id)
+        }
+
+        return checkoutId
+      }
 
     self.createCheckoutSuccess = checkoutValues.withLatestFrom(
       Signal.combineLatest(
@@ -385,7 +394,7 @@ public class ConfirmDetailsViewModel: ConfirmDetailsViewModelType, ConfirmDetail
         shipping: shipping,
         refTag: initialData.refTag,
         context: initialData.context,
-        checkoutId: checkoutValue
+        checkoutId: checkoutValue ?? ""
       )
     }
 

Library/ViewModels/PostCampaignCheckoutViewModel.swift

@@ -3,6 +3,7 @@ import KsApi
 import PassKit
 import Prelude
 import ReactiveSwift
+import Stripe
 
 public struct PostCampaignCheckoutData: Equatable {
   public let project: Project
@@ -20,8 +21,10 @@ public struct PostCampaignCheckoutData: Equatable {
 
 public protocol PostCampaignCheckoutViewModelInputs {
   func configure(with data: PostCampaignCheckoutData)
+  func creditCardSelected(with stripeCardIdAndPaymentIntent: (String, String))
   func goToLoginSignupTapped()
   func pledgeDisclaimerViewDidTapLearnMore()
+  func submitButtonTapped()
   func termsOfUseTapped(with: HelpType)
   func userSessionStarted()
   func viewDidLoad()
@@ -34,10 +37,12 @@ public protocol PostCampaignCheckoutViewModelOutputs {
     Never
   > { get }
   var configurePledgeViewCTAContainerView: Signal<PledgeViewCTAContainerViewData, Never> { get }
+  var configureStripeIntegration: Signal<StripeConfigurationData, Never> { get }
   var goToLoginSignup: Signal<(LoginIntent, Project, Reward?), Never> { get }
   var paymentMethodsViewHidden: Signal<Bool, Never> { get }
+  var showErrorBannerWithMessage: Signal<String, Never> { get }
   var showWebHelp: Signal<HelpType, Never> { get }
-  var configureStripeIntegration: Signal<StripeConfigurationData, Never> { get }
+  var validateCheckoutSuccess: Signal<String, Never> { get }
 }
 
 public protocol PostCampaignCheckoutViewModelType {
@@ -57,6 +62,7 @@ public class PostCampaignCheckoutViewModel: PostCampaignCheckoutViewModelType,
     .skipNil()
 
     let context = initialData.map(\.context)
+    let checkoutId = initialData.map(\.checkoutId)
 
     let configurePaymentMethodsData = Signal.merge(
       initialData,
@@ -130,6 +136,35 @@ public class PostCampaignCheckoutViewModel: PostCampaignCheckoutViewModelType,
         AppEnvironment.current.environmentType.stripePublishableKey
       )
     }
+
+    // MARK: Validate Checkout Details On Submit
+
+    let stripeCardIdAndPaymentIntent = self.creditCardSelectedSignal.signal
+
+    let validateCheckout = Signal.combineLatest(checkoutId, stripeCardIdAndPaymentIntent)
+      .takeWhen(self.submitButtonTappedProperty.signal)
+      .switchMap { checkoutId, stripeCardIdAndPaymentIntent in
+        let (stripeCardId, paymentIntent) = stripeCardIdAndPaymentIntent
+
+        return AppEnvironment.current.apiService
+          .validateCheckout(
+            checkoutId: checkoutId,
+            paymentSourceId: stripeCardId,
+            paymentIntentClientSecret: paymentIntent
+          )
+          .ksr_delay(AppEnvironment.current.apiDelayInterval, on: AppEnvironment.current.scheduler)
+          .materialize()
+      }
+
+    self.validateCheckoutSuccess = stripeCardIdAndPaymentIntent
+      .takeWhen(validateCheckout.values().ignoreValues())
+      .map { stripeCardIdAndPaymentIntent in
+        let (_, paymentIntent) = stripeCardIdAndPaymentIntent
+        return paymentIntent
+      }
+
+    self.showErrorBannerWithMessage = validateCheckout.errors()
+      .map { _ in Strings.Something_went_wrong_please_try_again() }
   }
 
   // MARK: - Inputs
@@ -139,6 +174,12 @@ public class PostCampaignCheckoutViewModel: PostCampaignCheckoutViewModelType,
     self.configureWithDataProperty.value = data
   }
 
+  private let (creditCardSelectedSignal, creditCardSelectedObserver) = Signal<(String, String), Never>
+    .pipe()
+  public func creditCardSelected(with stripeCardIdAndPaymentIntent: (String, String)) {
+    self.creditCardSelectedObserver.send(value: stripeCardIdAndPaymentIntent)
+  }
+
   private let (goToLoginSignupSignal, goToLoginSignupObserver) = Signal<Void, Never>.pipe()
   public func goToLoginSignupTapped() {
     self.goToLoginSignupObserver.send(value: ())
@@ -150,6 +191,11 @@ public class PostCampaignCheckoutViewModel: PostCampaignCheckoutViewModelType,
     self.pledgeDisclaimerViewDidTapLearnMoreObserver.send(value: ())
   }
 
+  private let submitButtonTappedProperty = MutableProperty(())
+  public func submitButtonTapped() {
+    self.submitButtonTappedProperty.value = ()
+  }
+
   private let (termsOfUseTappedSignal, termsOfUseTappedObserver) = Signal<HelpType, Never>.pipe()
   public func termsOfUseTapped(with helpType: HelpType) {
     self.termsOfUseTappedObserver.send(value: helpType)
@@ -174,10 +220,12 @@ public class PostCampaignCheckoutViewModel: PostCampaignCheckoutViewModelType,
     PledgeSummaryViewData
   ), Never>
   public let configurePledgeViewCTAContainerView: Signal<PledgeViewCTAContainerViewData, Never>
+  public let configureStripeIntegration: Signal<StripeConfigurationData, Never>
   public let goToLoginSignup: Signal<(LoginIntent, Project, Reward?), Never>
   public let paymentMethodsViewHidden: Signal<Bool, Never>
+  public let showErrorBannerWithMessage: Signal<String, Never>
   public let showWebHelp: Signal<HelpType, Never>
-  public let configureStripeIntegration: Signal<StripeConfigurationData, Never>
+  public let validateCheckoutSuccess: Signal<String, Never>
 
   public var inputs: PostCampaignCheckoutViewModelInputs { return self }
   public var outputs: PostCampaignCheckoutViewModelOutputs { return self }