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//
// RelaySelector.swift
// PacketTunnel
//
// Created by pronebird on 11/06/2019.
// Copyright © 2019 Mullvad VPN AB. All rights reserved.
//
import Foundation
import Network
struct RelaySelectorResult {
var relay: RelayList.Hostname
var tunnel: RelayList.WireguardTunnel
var endpoint: MullvadEndpoint
var geoLocation: GeoLocation
}
struct RelaySelector {
private let relayList: RelayList
init(relayList: RelayList) {
self.relayList = relayList
}
/// Produce a `RelayList` satisfying the given constraints
private func applyConstraints(_ constraints: RelayConstraints) -> RelayList {
let filteredCountries = relayList.countries.filter { (country) -> Bool in
switch constraints.location {
case .any:
return true
case .only(let constraint):
switch constraint {
case .country(let countryCode):
return countryCode == country.code
case .city(let countryCode, _):
return countryCode == country.code
case .hostname(let countryCode, _, _):
return countryCode == country.code
}
}
}.map { (country) -> RelayList.Country in
var filteredCountry = country
filteredCountry.cities = country.cities.filter { (city) -> Bool in
switch constraints.location {
case .any:
return true
case .only(let constraint):
switch constraint {
case .country:
return true
case .city(_, let cityCode):
return cityCode == city.code
case .hostname(_, let cityCode, _):
return cityCode == city.code
}
}
}.map { (city) -> RelayList.City in
var filteredCity = city
filteredCity.relays = city.relays.filter { (relay) -> Bool in
switch constraints.location {
case .any:
return true
case .only(let constraint):
switch constraint {
case .country, .city:
return true
case .hostname(_, _, let hostname):
return hostname == relay.hostname
}
}
}
.map({ (relay) -> RelayList.Hostname in
var filteredRelay = relay
filteredRelay.tunnels?.wireguard = relay.tunnels?.wireguard?
.filter { !$0.portRanges.isEmpty }
return filteredRelay
}).filter { (relay) -> Bool in
guard let wireguardTunnels = relay.tunnels?.wireguard else { return false }
return relay.active && !wireguardTunnels.isEmpty
}
return filteredCity
}.filter({ (city) -> Bool in
return !city.relays.isEmpty
})
return filteredCountry
}.filter { (country) -> Bool in
return !country.cities.isEmpty
}
return RelayList(countries: filteredCountries)
}
func evaluate(with constraints: RelayConstraints) -> RelaySelectorResult? {
let filteredRelayList = applyConstraints(constraints)
guard let country = filteredRelayList.countries.randomElement() else {
return nil
}
guard let city = country.cities.randomElement() else {
return nil
}
guard let relay = city.relays.randomElement() else {
return nil
}
guard let tunnel = relay.tunnels?.wireguard?.randomElement() else {
return nil
}
guard let port = tunnel.portRanges.randomElement()?.randomElement() else {
return nil
}
let endpoint = MullvadEndpoint(
ipv4Relay: IPv4Endpoint(ip: relay.ipv4AddrIn, port: port),
ipv6Relay: nil,
ipv4Gateway: tunnel.ipv4Gateway,
ipv6Gateway: tunnel.ipv6Gateway,
publicKey: tunnel.publicKey
)
let geoLocation = GeoLocation(
country: country.name,
city: city.name,
latitude: city.latitude,
longitude: city.longitude
)
return RelaySelectorResult(
relay: relay,
tunnel: tunnel,
endpoint: endpoint,
geoLocation: geoLocation
)
}
}
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