passepartout-apple/Passepartout/Library/Sources/AppUI/AppUI.swift

//
//  AppUI.swift
//  Passepartout
//
//  Created by Davide De Rosa on 7/31/24.
//  Copyright (c) 2024 Davide De Rosa. All rights reserved.
//
//  https://github.com/passepartoutvpn
//
//  This file is part of Passepartout.
//
//  Passepartout is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  Passepartout is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with Passepartout.  If not, see <http://www.gnu.org/licenses/>.
//

import Foundation
import NetworkExtension
import PassepartoutKit

public enum AppUI {
    public static func configure(with context: AppContext) {
        assertMissingModuleImplementations()
        Task {
            try? await context.providerManager.fetchIndex(from: API.shared)
        }
    }
}

private extension AppUI {
    static func assertMissingModuleImplementations() {
        let providerModuleTypes: Set<ModuleType> = [
            .openVPN
        ]
        ModuleType.allCases.forEach { moduleType in
            let builder = moduleType.newModule()
            guard builder is ModuleTypeProviding else {
                fatalError("\(moduleType): is not ModuleTypeProviding")
            }
            guard builder is any ModuleViewProviding else {
                fatalError("\(moduleType): is not ModuleViewProviding")
            }
            if providerModuleTypes.contains(moduleType) {
                do {
                    let module = try builder.tryBuild()
                    guard module is any ProviderEntityViewProviding else {
                        fatalError("\(moduleType): is not ProviderEntityViewProviding")
                    }
                } catch {
                    fatalError("\(moduleType): empty module is not buildable")
                }
            }
        }
    }
}