iOSアプリに特定バージョンを対象とした強制アップデート機能を追加する

{
  "url": "https://apps.apple.com/jp/app/id6504763618?mt=8",
  "version": "1.4.0"
}

{
  "url": "https://apps.apple.com/jp/app/id6504763618?mt=8",
  "version": "1.4.0",
  "minimum_version": "1.4.0",
  "specific_versions": ["2.2.0"]
}

struct ConfigResponse: Sendable, Decodable {
    let url: String
    let minimumVersion: String
    let specificVersions: [String]?

    enum CodingKeys: String, CodingKey {
        case url
        case minimumVersion = "minimum_version"
        case specificVersions = "specific_versions"
    }
}

import Foundation

enum CheckForceUpdateUseCaseResult {
    // アップデートの必要はない
    case noUpdateNeeded

    // 強制アップデートをおこなう
    case updateRequirement(ConfigResponse)
}

/// 強制アップデートファイルの確認
class CheckForceUpdateUseCase: UseCaseProtocol {
    typealias Input = Void
    typealias Output = CheckForceUpdateUseCaseResult

    private let configUrl = URL(string: "https://example.com/ios/config.json")

    private let bundleShortVersion: String?

    init(
        bundleShortVersion: String? = Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String
    ) {
        self.bundleShortVersion = bundleShortVersion
    }

    func execute(_: Input) async -> Result<Output, any Error> {
        return await loadConfig()
    }

    private func loadConfig() async -> Result<Output, any Error> {
        do {
            var request = URLRequest(url: configUrl!)
            request.cachePolicy = .reloadIgnoringLocalAndRemoteCacheData
            request.timeoutInterval = 10
            let (data, response) = try await URLSession.shared.data(for: request)

            guard
                let httpResponse = response as? HTTPURLResponse,
                httpResponse.statusCode == 200
            else {
                // ネットワークのアクセス経路に異常がある
                throw NSError(domain: "app.example", code: 393)
            }

            let config = try JSONDecoder().decode(ConfigResponse.self, from: data)
            return await checkVersion(config: config)
        } catch {
            return .failure(error)
        }
    }

    func checkVersion(config: ConfigResponse) async -> Result<Output, any Error> {
        guard let version = bundleShortVersion else {
            return .success(.noUpdateNeeded)
        }

        // 最低バージョンを確認
        if version.compare(config.minimumVersion, options: .numeric) == .orderedAscending {
            return .success(.updateRequirement(config))
        }

        // 強制アップデート対象のバージョンリストを確認
        if let specificVersions = config.specificVersions, specificVersions.contains(version) {
            return .success(.updateRequirement(config))
        }

        return .success(.noUpdateNeeded)
    }
}