App installed check

CHANGELOG.md

@@ -1,6 +1,11 @@
 # Braintree iOS SDK Release Notes
 
 ## unreleased
+* BraintreeCore
+  * Add property `BTAppContextSwitcher.sharedInstance.universalLink` for the PayPal app switch flow
+* BraintreePayPal
+  * Add `BTPayPalVault.enablePayPalAppSwitch`
+    * If set to `true` we will attempt to use the PayPal App Switch flow
 * Require Xcode 15.0+ (per [App Store requirements](https://developer.apple.com/news/?id=khzvxn8a))
 * BraintreePayPal
   * Add `BTPayPalVaultRequest(userAuthenticationEmail:enablePayPalAppSwitch:universalLink:offerCredit:)`

Sources/BraintreePayPal/BTPayPalClient.swift

@@ -15,11 +15,11 @@ import BraintreeDataCollector
 
     /// Exposed for testing to get the instance of BTAPIClient
     var apiClient: BTAPIClient
-    
+
     /// Defaults to `UIApplication.shared`, but exposed for unit tests to inject test doubles
     /// to prevent calls to openURL. Subclassing UIApplication is not possible, since it enforces that only one instance can ever exist.
     var application: URLOpener = UIApplication.shared
-    
+
     /// Exposed for testing the approvalURL construction
     var approvalURL: URL? = nil
 
@@ -49,6 +49,9 @@ import BraintreeDataCollector
     /// In the PayPal flow this will be either an EC token or a Billing Agreement token
     private var payPalContextID: String? = nil
 
+    /// URL Scheme for PayPal In-App Checkout
+    private let payPalInAppScheme: String = "paypal-in-app-checkout://"
+
     // MARK: - Initializer
 
     /// Initialize a new PayPal client instance.
@@ -154,9 +157,16 @@ import BraintreeDataCollector
             }
         }
     }
-
+
+    @objc public func isPayPalAppInstalled() -> Bool {
+        guard let paypalURL = URL(string: payPalInAppScheme) else {
+            return false
+        }
+        return application.canOpenURL(paypalURL)
+    }
+
     // MARK: - Internal Methods
-    
+
     func handleBrowserSwitchReturn(
         _ url: URL?,
         paymentType: BTPayPalPaymentType,
@@ -262,6 +272,10 @@ import BraintreeDataCollector
                 return
             }
 
+            if !self.isPayPalAppInstalled() {
+                (request as? BTPayPalVaultRequest)?.enablePayPalAppSwitch = false
+            }
+
             self.payPalRequest = request
             self.apiClient.post(request.hermesPath, parameters: request.parameters(with: configuration)) { body, response, error in
                 if let error = error as? NSError {

UnitTests/BraintreePayPalTests/BTPayPalClient_Tests.swift

@@ -728,6 +728,27 @@ class BTPayPalClient_Tests: XCTestCase {
     }
 
 
+    func testIsiOSAppSwitchAvailable_whenApplicationCanOpenPayPalInAppURL_returnsTrue() {
+        let payPalClient = BTPayPalClient(apiClient: mockAPIClient)
+        BTAppContextSwitcher.sharedInstance.returnURLScheme = "scheme"
+        let fakeApplication = FakeApplication()
+        fakeApplication.cannedCanOpenURL = false
+        fakeApplication.canOpenURLWhitelist.append(URL(string: "paypal-in-app-checkout://")!)
+        payPalClient.application = fakeApplication
+
+        XCTAssertTrue(payPalClient.isPayPalAppInstalled())
+    }
+
+    func testIsiOSAppSwitchAvailable_whenApplicationCantOpenPayPalInAppURL_returnsFalse() {
+        let payPalClient = BTPayPalClient(apiClient: mockAPIClient)
+        BTAppContextSwitcher.sharedInstance.returnURLScheme = "scheme"
+        let fakeApplication = FakeApplication()
+        fakeApplication.cannedCanOpenURL = false
+        payPalClient.application = fakeApplication
+
+        XCTAssertFalse(payPalClient.isPayPalAppInstalled())
+    }
+
     // MARK: - Analytics
 
     func testAPIClientMetadata_hasIntegrationSetToCustom() {