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105 changes: 105 additions & 0 deletions
105
ios/MullvadVPN/GeneralAPIs/OutgoingConnectionProxy.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| // | ||
| // OutgoingConnectionProxy.swift | ||
| // MullvadREST | ||
| // | ||
| // Created by Mojgan on 2023-10-24. | ||
| // Copyright © 2023 Mullvad VPN AB. All rights reserved. | ||
| // | ||
|
|
||
| import Foundation | ||
| import MullvadREST | ||
| import MullvadTypes | ||
| import Network | ||
|
|
||
| protocol OutgoingConnectionHandling { | ||
| func getIPV6(retryStrategy: REST.RetryStrategy) async throws -> OutgoingConnectionProxy.IPV6ConnectionData | ||
| func getIPV4(retryStrategy: REST.RetryStrategy) async throws -> OutgoingConnectionProxy.IPV4ConnectionData | ||
| } | ||
|
|
||
| final class OutgoingConnectionProxy: OutgoingConnectionHandling { | ||
| let urlSession: URLSession | ||
|
|
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| init(urlSession: URLSession) { | ||
| self.urlSession = urlSession | ||
| } | ||
|
|
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| func getIPV6(retryStrategy: REST.RetryStrategy) async throws -> IPV6ConnectionData { | ||
| try await perform(retryStrategy: retryStrategy, path: "https://ipv6.am.i.mullvad.net/json") | ||
| } | ||
|
|
||
| func getIPV4(retryStrategy: REST.RetryStrategy) async throws -> IPV4ConnectionData { | ||
| try await perform(retryStrategy: retryStrategy, path: "https://ipv4.am.i.mullvad.net/json") | ||
| } | ||
|
|
||
| private func perform<T: Decodable>(retryStrategy: REST.RetryStrategy, path: String) async throws -> T { | ||
| let delayIterator = retryStrategy.makeDelayIterator() | ||
| for _ in 0 ..< retryStrategy.maxRetryCount { | ||
| do { | ||
| return try await perform(path: path) | ||
| } catch { | ||
| // ignore if request is cancelled | ||
| if case URLError.cancelled = error { | ||
| throw error | ||
| } else { | ||
| // retry with the delay | ||
| guard let delay = delayIterator.next() else { throw error } | ||
| let mills = UInt64(max(0, delay.milliseconds)) | ||
| let nanos = mills.saturatingMultiplication(1_000_000) | ||
| try await Task.sleep(nanoseconds: nanos) | ||
| } | ||
| } | ||
| } | ||
| return try await perform(path: path) | ||
| } | ||
|
|
||
| private func perform<T: Decodable>(path: String) async throws -> T { | ||
| guard let url = URL(string: path) else { | ||
| throw REST.Error.network(URLError(.badURL)) | ||
| } | ||
| do { | ||
| let (data, response) = try await urlSession.data(from: url) | ||
| guard let httpResponse = response as? HTTPURLResponse else { | ||
| throw REST.Error.network(URLError(.badServerResponse)) | ||
| } | ||
| let decoder = JSONDecoder() | ||
| guard (200 ..< 300).contains(httpResponse.statusCode) else { | ||
| throw REST.Error.unhandledResponse( | ||
| httpResponse.statusCode, | ||
| try? decoder.decode( | ||
| REST.ServerErrorResponse.self, | ||
| from: data | ||
| ) | ||
| ) | ||
| } | ||
| let connectionData = try decoder.decode(T.self, from: data) | ||
| return connectionData | ||
|
|
||
| } catch { | ||
| throw error | ||
| } | ||
| } | ||
| } | ||
|
|
||
| extension OutgoingConnectionProxy { | ||
| typealias IPV4ConnectionData = OutgoingConnectionData<IPv4Address> | ||
| typealias IPV6ConnectionData = OutgoingConnectionData<IPv6Address> | ||
| typealias IPAddressType = Codable & IPAddress | ||
|
|
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| // MARK: - OutgoingConnectionData | ||
|
|
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| struct OutgoingConnectionData<T: IPAddressType>: Codable, Equatable { | ||
| let ip: T? | ||
| let exitIP: Bool | ||
|
|
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| enum CodingKeys: String, CodingKey { | ||
| case ip, exitIP = "mullvad_exit_ip" | ||
| } | ||
|
|
||
| static func == ( | ||
| lhs: OutgoingConnectionProxy.OutgoingConnectionData<T>, | ||
| rhs: OutgoingConnectionProxy.OutgoingConnectionData<T> | ||
| ) -> Bool { | ||
| lhs.ip?.rawValue == rhs.ip?.rawValue && lhs.exitIP == rhs.exitIP | ||
| } | ||
| } | ||
| } |
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