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//
// MullvadAPIProxy.swift
// MullvadVPN
//
// Created by Jon Petersson on 2025-03-19.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import MullvadRustRuntime
import MullvadTypes
import Operations
import WireGuardKitTypes
public protocol APIQuerying: Sendable {
func getAddressList(
retryStrategy: REST.RetryStrategy,
completionHandler: @escaping @Sendable ProxyCompletionHandler<[AnyIPEndpoint]>
) -> Cancellable
func getRelays(
etag: String?,
retryStrategy: REST.RetryStrategy,
completionHandler: @escaping @Sendable ProxyCompletionHandler<REST.ServerRelaysCacheResponse>
) -> Cancellable
func createApplePayment(
accountNumber: String,
receiptString: Data
) -> any RESTRequestExecutor<REST.CreateApplePaymentResponse>
func sendProblemReport(
_ body: REST.ProblemReportRequest,
retryStrategy: REST.RetryStrategy,
completionHandler: @escaping @Sendable ProxyCompletionHandler<Void>
) -> Cancellable
func submitVoucher(
voucherCode: String,
accountNumber: String,
retryStrategy: REST.RetryStrategy,
completionHandler: @escaping @Sendable ProxyCompletionHandler<REST.SubmitVoucherResponse>
) -> Cancellable
}
extension REST {
public final class MullvadAPIProxy: APIQuerying, @unchecked Sendable {
let transportProvider: APITransportProviderProtocol
let dispatchQueue: DispatchQueue
let operationQueue = AsyncOperationQueue()
let responseDecoder: JSONDecoder
public init(
transportProvider: APITransportProviderProtocol,
dispatchQueue: DispatchQueue,
responseDecoder: JSONDecoder
) {
self.transportProvider = transportProvider
self.dispatchQueue = dispatchQueue
self.responseDecoder = responseDecoder
}
public func getAddressList(
retryStrategy: REST.RetryStrategy,
completionHandler: @escaping @Sendable ProxyCompletionHandler<[AnyIPEndpoint]>
) -> Cancellable {
let responseHandler = rustResponseHandler(
decoding: [AnyIPEndpoint].self,
with: responseDecoder
)
return createNetworkOperation(
request: .getAddressList(retryStrategy),
responseHandler: responseHandler,
completionHandler: completionHandler
)
}
public func getRelays(
etag: String?,
retryStrategy: REST.RetryStrategy,
completionHandler: @escaping @Sendable ProxyCompletionHandler<REST.ServerRelaysCacheResponse>
) -> Cancellable {
if var etag {
// Enforce weak validator to account for some backend caching quirks.
if etag.starts(with: "\"") {
etag.insert(contentsOf: "W/", at: etag.startIndex)
}
}
let responseHandler = rustCustomResponseHandler { [weak self] data, responseEtag in
if let responseEtag, responseEtag == etag {
return REST.ServerRelaysCacheResponse.notModified
} else {
// Discarding result since we're only interested in knowing that it's parseable.
let canDecodeResponse = (try? self?.responseDecoder.decode(
REST.ServerRelaysResponse.self,
from: data
)) != nil
return canDecodeResponse ? REST.ServerRelaysCacheResponse.newContent(responseEtag, data) : nil
}
}
return createNetworkOperation(
request: .getRelayList(retryStrategy, etag: etag),
responseHandler: responseHandler,
completionHandler: completionHandler
)
}
public func createApplePayment(
accountNumber: String,
receiptString: Data
) -> any RESTRequestExecutor<REST.CreateApplePaymentResponse> {
RESTRequestExecutorStub<REST.CreateApplePaymentResponse>(success: {
.timeAdded(42, .distantFuture)
})
}
public func sendProblemReport(
_ body: ProblemReportRequest,
retryStrategy: REST.RetryStrategy,
completionHandler: @escaping ProxyCompletionHandler<Void>
) -> Cancellable {
AnyCancellable()
}
public func submitVoucher(
voucherCode: String,
accountNumber: String,
retryStrategy: REST.RetryStrategy,
completionHandler: @escaping ProxyCompletionHandler<REST.SubmitVoucherResponse>
) -> Cancellable {
AnyCancellable()
}
private func createNetworkOperation<Success: Decodable>(
request: APIRequest,
responseHandler: RustResponseHandler<Success>,
completionHandler: @escaping @Sendable ProxyCompletionHandler<Success>
) -> MullvadApiNetworkOperation<Success> {
let networkOperation = MullvadApiNetworkOperation(
name: request.name,
dispatchQueue: dispatchQueue,
request: request,
transportProvider: transportProvider,
responseDecoder: responseDecoder,
responseHandler: responseHandler,
completionHandler: completionHandler
)
operationQueue.addOperation(networkOperation)
return networkOperation
}
}
// MARK: - Response types
public enum ServerRelaysCacheResponse: Sendable, Decodable {
case notModified
case newContent(_ etag: String?, _ rawData: Data)
}
private struct CreateApplePaymentRequest: Encodable, Sendable {
let receiptString: Data
}
public enum CreateApplePaymentResponse: Sendable {
case noTimeAdded(_ expiry: Date)
case timeAdded(_ timeAdded: Int, _ newExpiry: Date)
public var newExpiry: Date {
switch self {
case let .noTimeAdded(expiry), let .timeAdded(_, expiry):
return expiry
}
}
public var timeAdded: TimeInterval {
switch self {
case .noTimeAdded:
return 0
case let .timeAdded(timeAdded, _):
return TimeInterval(timeAdded)
}
}
/// Returns a formatted string for the `timeAdded` interval, i.e "30 days"
public var formattedTimeAdded: String? {
let formatter = DateComponentsFormatter()
formatter.allowedUnits = [.day, .hour]
formatter.unitsStyle = .full
return formatter.string(from: self.timeAdded)
}
}
private struct CreateApplePaymentRawResponse: Decodable, Sendable {
let timeAdded: Int
let newExpiry: Date
}
public struct ProblemReportRequest: Encodable, Sendable {
public let address: String
public let message: String
public let log: String
public let metadata: [String: String]
public init(address: String, message: String, log: String, metadata: [String: String]) {
self.address = address
self.message = message
self.log = log
self.metadata = metadata
}
}
}
// TODO: Remove when "createApplePayment" func is implemented.
private struct RESTRequestExecutorStub<Success: Sendable>: RESTRequestExecutor {
var success: (() -> Success)?
func execute(completionHandler: @escaping (Result<Success, Error>) -> Void) -> Cancellable {
if let result = success?() {
completionHandler(.success(result))
}
return AnyCancellable()
}
func execute(
retryStrategy: REST.RetryStrategy,
completionHandler: @escaping (Result<Success, Error>) -> Void
) -> Cancellable {
if let result = success?() {
completionHandler(.success(result))
}
return AnyCancellable()
}
func execute() async throws -> Success {
try await execute(retryStrategy: .noRetry)
}
func execute(retryStrategy: REST.RetryStrategy) async throws -> Success {
guard let success = success else { throw POSIXError(.EINVAL) }
return success()
}
}
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