Swift PassKit: Apple Wallet Integration

import PassKit

enum PassType {
    case boardingPass
    case coupon
    case eventTicket
    case generic
    case storeCard
}

// pass.json (Pass JSON configuration)
{
    "formatVersion": 1,
    "passTypeIdentifier": "pass.com.yourapp.boarding",
    "serialNumber": "123456",
    "teamIdentifier": "YOUR_TEAM_ID",
    "webServiceURL": "https://yourapp.com/passes",
    "authenticationToken": "your_auth_token",
    "backgroundColor": "rgb(255,255,255)",
    "logoText": "Your Airline",
    "description": "Boarding Pass",
    "organizationName": "Your Airline",
    "foregroundColor": "rgb(0,0,0)",
    "labelColor": "rgb(255,255,255)",
    "boardingPass": {
        "primaryFields": [
            {
                "key": "origin",
                "label": "San Francisco",
                "value": "SFO"
            },
            {
                "key": "destination",
                "label": "New York",
                "value": "JFK"
            }
        ],
        "secondaryFields": [
            {
                "key": "flight",
                "label": "Flight",
                "value": "123"
            },
            {
                "key": "date",
                "label": "Date",
                "value": "2025-03-27"
            }
        ],
        "backFields": [
            {
                "key": "passenger",
                "label": "Passenger",
                "value": "John Doe"
            },
            {
                "key": "seat",
                "label": "Seat",
                "value": "12A"
            }
        ],
        "transitType": "PKTransitTypeAir"
    },
    "barcode": {
        "format": "PKBarcodeFormatQR",
        "message": "FLIGHT123*SFOJFK*2025-03-27",
        "messageEncoding": "iso-8859-1"
    }
}

import Foundation

class PassGenerator {
    func generatePass() throws -> Data {
        // Create pass.json
        let passJSON = """
        {
            "formatVersion": 1,
            "passTypeIdentifier": "pass.com.yourapp.generic",
            "serialNumber": "\(UUID().uuidString)",
            "teamIdentifier": "YOUR_TEAM_ID",
            "organizationName": "Your Company",
            "description": "Loyalty Card",
            "logoText": "Your Brand",
            "foregroundColor": "rgb(0,0,0)",
            "backgroundColor": "rgb(255,255,255)",
            "generic": {
                "primaryFields": [
                    {
                        "key": "name",
                        "label": "Name",
                        "value": "John Doe"
                    }
                ],
                "secondaryFields": [
                    {
                        "key": "balance",
                        "label": "Balance",
                        "value": "100 points"
                    }
                ]
            },
            "barcode": {
                "format": "PKBarcodeFormatQR",
                "message": "MEMBER123",
                "messageEncoding": "iso-8859-1"
            }
        }
        """

        let passData = passJSON.data(using: .utf8)!

        // Sign pass (requires certificate)
        let signedPass = try signPass(passData: passData)

        // Create .pkpass file
        return createPKPass(signedPass: signedPass)
    }

    private func signPass(passData: Data) throws -> Data {
        // Load certificate
        let certificateURL = Bundle.main.url(forResource: "passCertificate", withExtension: "pem")!
        let certificate = try String(contentsOf: certificateURL, encoding: .utf8)

        // Create manifest
        let manifest = [
            "pass.json": base64Encode(data: passData)
        ]

        let manifestData = try JSONSerialization.data(withJSONObject: manifest)
        let manifestSignature = signManifest(manifest: manifestData)

        // Create signature
        let signature = base64Encode(data: manifestSignature)

        let passDictionary: [String: Any] = [
            "manifest": manifest,
            "signature": signature
        ]

        return try JSONSerialization.data(withJSONObject: passDictionary)
    }

    private func createPKPass(signedPass: Data) -> Data {
        // Create .pkpass archive
        return signedPass
    }

    private func base64Encode(data: Data) -> String {
        return data.base64EncodedString()
    }

    private func signManifest(manifest: Data) -> Data {
        // Sign manifest with private key
        return manifest // Implementation depends on your crypto setup
    }
}

import PassKit

struct AddPassView: View {
    @State private var showAddPassSheet = false
    @State private var passURL: URL?

    var body: some View {
        VStack {
            Button("Add to Wallet") {
                addPassToWallet()
            }
            .padding()
            .background(Color.blue)
            .foregroundColor(.white)
            .cornerRadius(10)
        }
        .sheet(isPresented: $showAddPassSheet) {
            if let url = passURL {
                AddPassView(url: url)
            }
        }
    }

    func addPassToWallet() {
        // Generate pass and create URL
        guard let passURL = generatePassURL() else {
            return
        }

        self.passURL = passURL
        showAddPassSheet = true
    }

    func generatePassURL() -> URL? {
        // Generate pass and serve from your server
        // or embed in app
        return URL(string: "https://yourapp.com/pass.pkpass")
    }
}

struct AddPassView: UIViewControllerRepresentable {
    let url: URL

    func makeUIViewController(context: Context) -> PKAddPassesViewController {
        return PKAddPassesViewController(passURL: url)
    }

    func updateUIViewController(_ uiViewController: PKAddPassesViewController, context: Context) {}
}

import PassKit

struct ApplePayView: View {
    @State private var isProcessingPayment = false

    var body: some View {
        VStack {
            Button("Pay with Apple Pay") {
                processApplePay()
            }
            .disabled(isProcessingPayment)
            .padding()
            .background(Color.black)
            .foregroundColor(.white)
            .cornerRadius(10)
        }
    }

    func processApplePay() {
        let request = PKPaymentRequest()
        request.merchantIdentifier = "merchant.com.yourapp"
        request.supportedNetworks = [.visa, .masterCard, .amex]
        request.countryCode = "US"
        request.currencyCode = "USD"
        request.paymentSummaryItems = [
            PKPaymentSummaryItem(
                label: "Product",
                amount: NSDecimalNumber(value: 19.99),
                type: .final
            )
        ]

        if let controller = PKPaymentAuthorizationController(paymentRequest: request) {
            controller.delegate = self
            controller.present(completion: nil)
        }
    }
}

extension ApplePayView: PKPaymentAuthorizationControllerDelegate {
    func paymentAuthorizationController(
        _ controller: PKPaymentAuthorizationController,
        didAuthorizePayment payment: PKPayment,
        completion: @escaping (PKPaymentAuthorizationStatus) -> Void
    ) {
        // Process payment
        completion(.success)
    }

    func paymentAuthorizationControllerDidFinish(_ controller: PKPaymentAuthorizationController) {
        controller.dismiss(completion: nil)
    }
}

class PassUpdateService {
    func updatePass(serialNumber: String, newBalance: Int) async throws {
        let url = URL(string: "https://yourapp.com/passes/\(serialNumber)")!

        var request = URLRequest(url: url)
        request.httpMethod = "PUT"
        request.setValue("application/json", forHTTPHeaderField: "Content-Type")

        let updateData: [String: Any] = [
            "balance": newBalance
        ]

        request.httpBody = try JSONSerialization.data(withJSONObject: updateData)

        let (_, response) = try await URLSession.shared.data(for: request)

        guard let httpResponse = response as? HTTPURLResponse,
              httpResponse.statusCode == 200 else {
            throw PassUpdateError.updateFailed
        }
    }

    enum PassUpdateError: Error {
        case updateFailed
    }
}

import UIKit

class PassSharing {
    func sharePass(passFile: URL) {
        let activityViewController = UIActivityViewController(
            activityItems: [passFile],
            applicationActivities: nil
        )

        if let windowScene = UIApplication.shared.connectedScenes.first as? UIWindowScene,
           let rootViewController = windowScene.windows.first?.rootViewController {
            rootViewController.present(activityViewController, animated: true)
        }
    }

    func sharePassViaEmail(passFile: URL) {
        let subject = "Your Boarding Pass"
        let body = "Attached is your boarding pass for your upcoming flight."

        if let mailToString = "mailto:?subject=\(subject)&body=\(body)".addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed),
           let mailURL = URL(string: mailToString) {
            UIApplication.shared.open(mailURL)
        }
    }
}