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//
// AccessMethodRepository.swift
// MullvadVPN
//
// Created by Jon Petersson on 12/12/2023.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import Combine
import Foundation
import MullvadLogging
import MullvadTypes
public class AccessMethodRepository: AccessMethodRepositoryProtocol, @unchecked Sendable {
public static let directId = UUID(uuidString: "C9DB7457-2A55-42C3-A926-C07F82131994")!
public static let bridgeId = UUID(uuidString: "8586E75A-CA7B-4432-B70D-EE65F3F95084")!
public static let encryptedDNSId = UUID(uuidString: "831CB1F8-1829-42DD-B9DC-82902F298EC0")!
private let logger = Logger(label: "AccessMethodRepository")
// The access method names will be localised on creation time. As they are persisted
// to on-device storage, they will not be relocalised if the user changes language.
private let direct = PersistentAccessMethod(
id: AccessMethodRepository.directId,
name: "Direct",
isEnabled: true,
proxyConfiguration: .direct
)
private let bridge = PersistentAccessMethod(
id: AccessMethodRepository.bridgeId,
name: "Mullvad bridges",
isEnabled: true,
proxyConfiguration: .bridges
)
private let encryptedDNS = PersistentAccessMethod(
id: AccessMethodRepository.encryptedDNSId,
name: "Encrypted DNS proxy",
isEnabled: true,
proxyConfiguration: .encryptedDNS
)
private let accessMethodsSubject: CurrentValueSubject<[PersistentAccessMethod], Never>
public var accessMethodsPublisher: AnyPublisher<[PersistentAccessMethod], Never> {
accessMethodsSubject.eraseToAnyPublisher()
}
private let requestAccessMethodSubject: PassthroughSubject<PersistentAccessMethod, Never>
public var requestAccessMethodPublisher: AnyPublisher<PersistentAccessMethod, Never> {
requestAccessMethodSubject.eraseToAnyPublisher()
}
private let currentAccessMethodSubject: CurrentValueSubject<PersistentAccessMethod, Never>
public var currentAccessMethodPublisher: AnyPublisher<PersistentAccessMethod, Never> {
currentAccessMethodSubject.eraseToAnyPublisher()
}
public var directAccess: PersistentAccessMethod {
direct
}
private var cancellables: Set<Combine.AnyCancellable> = []
public init() {
accessMethodsSubject = CurrentValueSubject([])
requestAccessMethodSubject = PassthroughSubject()
currentAccessMethodSubject = CurrentValueSubject(direct)
addDefaultsMethods()
let lastReachable = fetchLastReachable()
accessMethodsSubject.send(fetchAll())
requestAccessMethodSubject.send(lastReachable)
// Set the correct access method, as opposed to the default value "direct" above.
currentAccessMethodSubject.value = lastReachable
currentAccessMethodPublisher
.removeDuplicates()
.sink { [weak self] currentAccessMethod in
self?.saveCurrentAccessMethod(currentAccessMethod)
}.store(in: &cancellables)
}
public func save(_ method: PersistentAccessMethod, notifyingAPI: Bool = false) {
var methodStore = readApiAccessMethodStore()
var method = method
method.name = method.name.trimmingCharacters(in: .whitespaces)
if let index = methodStore.accessMethods.firstIndex(where: { $0.id == method.id }) {
methodStore.accessMethods[index] = method
} else {
methodStore.accessMethods.append(method)
}
do {
try writeApiAccessMethodStore(methodStore)
if notifyingAPI {
accessMethodsSubject.send(methodStore.accessMethods)
}
} catch {
logger.error("Could not save access method: \(method) \nError: \(error)")
}
}
public func requestAccessMethod(_ method: PersistentAccessMethod) {
requestAccessMethodSubject.send(method)
}
private func saveCurrentAccessMethod(_ method: PersistentAccessMethod) {
var methodStore = readApiAccessMethodStore()
methodStore.lastReachableAccessMethod = method
do {
try writeApiAccessMethodStore(methodStore)
} catch {
logger.error("Could not save last reachable access method: \(method) \nError: \(error)")
}
}
public func delete(id: UUID) {
var methodStore = readApiAccessMethodStore()
guard let index = methodStore.accessMethods.firstIndex(where: { $0.id == id }) else { return }
// Prevent removing methods that have static UUIDs and are always present.
let method = methodStore.accessMethods[index]
if !method.kind.isPermanent {
methodStore.accessMethods.remove(at: index)
}
do {
try writeApiAccessMethodStore(methodStore)
accessMethodsSubject.send(methodStore.accessMethods)
} catch {
logger.error("Could not delete access method with id: \(id) \nError: \(error)")
}
}
public func fetch(by id: UUID) -> PersistentAccessMethod? {
fetchAll().first { $0.id == id }
}
public func fetchAll() -> [PersistentAccessMethod] {
readApiAccessMethodStore().accessMethods
}
public func fetchLastReachable() -> PersistentAccessMethod {
readApiAccessMethodStore().lastReachableAccessMethod
}
public func addDefaultsMethods() {
add([
direct,
bridge,
encryptedDNS,
])
}
private func add(_ methods: [PersistentAccessMethod]) {
var methodStore = readApiAccessMethodStore()
methods.forEach { method in
if !methodStore.accessMethods.contains(where: { $0.id == method.id }) {
methodStore.accessMethods.append(method)
}
}
do {
try writeApiAccessMethodStore(methodStore)
accessMethodsSubject.send(methods)
} catch {
logger.error("Could not update access methods: \(methods) \nError: \(error)")
}
}
private func readApiAccessMethodStore() -> PersistentAccessMethodStore {
let parser = makeParser()
do {
let data = try SettingsManager.store.read(key: .apiAccessMethods)
return try parser.parseUnversionedPayload(as: PersistentAccessMethodStore.self, from: data)
} catch {
logger.error("Could not load access method store: \(error)")
return PersistentAccessMethodStore(lastReachableAccessMethod: direct, accessMethods: [])
}
}
private func writeApiAccessMethodStore(_ store: PersistentAccessMethodStore) throws {
let parser = makeParser()
let data = try parser.produceUnversionedPayload(store)
try SettingsManager.store.write(data, for: .apiAccessMethods)
}
private func makeParser() -> SettingsParser {
SettingsParser(decoder: JSONDecoder(), encoder: JSONEncoder())
}
}
extension AccessMethodRepository: MullvadAccessMethodChangeListening {
public func accessMethodChangedTo(_ uuid: UUID) {
guard let method = accessMethodsSubject.value.first(where: { $0.id == uuid }) else {
logger.warning("Change reported to method with unknown ID: \(uuid)")
return
}
Task {
logger.debug("Mullvad API changed access method to \(method.name)")
currentAccessMethodSubject.send(method)
}
}
}
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