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//
// RelaySelector+Wireguard.swift
// MullvadREST
//
// Created by Mojgan on 2024-05-17.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import CoreLocation
import MullvadSettings
import MullvadTypes
extension RelaySelector {
public enum WireGuard {
/// Filters relay list using given constraints.
public static func findCandidates(
by relayConstraint: RelayConstraint<UserSelectedRelays>,
in relays: REST.ServerRelaysResponse,
filterConstraint: RelayConstraint<RelayFilter>,
daitaEnabled: Bool
) throws -> [RelayWithLocation<REST.ServerRelay>] {
let mappedRelays = RelayWithLocation.locateRelays(
relays: relays.wireguard.relays,
locations: relays.locations
)
return try applyConstraints(
relayConstraint,
filterConstraint: filterConstraint,
daitaEnabled: daitaEnabled,
relays: mappedRelays
)
}
/// Picks a random relay from a list.
public static func pickCandidate(
from relayWithLocations: [RelayWithLocation<REST.ServerRelay>],
wireguard: REST.ServerWireguardTunnels,
portConstraint: RelayConstraint<UInt16>,
numberOfFailedAttempts: UInt,
closeTo referenceLocation: Location? = nil
) throws -> RelaySelectorMatch {
let port = try evaluatePort(
portConstraint: portConstraint,
rawPortRanges: wireguard.portRanges,
numberOfFailedAttempts: numberOfFailedAttempts
)
var relayWithLocation: RelayWithLocation<REST.ServerRelay>?
if let referenceLocation {
let relay = closestRelay(
to: CLLocationCoordinate2D(
latitude: referenceLocation.latitude, longitude: referenceLocation.longitude),
using: relayWithLocations
)
relayWithLocation = relayWithLocations.first(where: { $0.relay == relay })
}
guard
let relayWithLocation = relayWithLocation ?? pickRandomRelayByWeight(relays: relayWithLocations)
else {
throw NoRelaysSatisfyingConstraintsError(.relayConstraintNotMatching)
}
return createMatch(for: relayWithLocation, port: port, wireguard: wireguard)
}
public static func closestRelay(
to location: CLLocationCoordinate2D,
using relayWithLocations: [RelayWithLocation<REST.ServerRelay>]
) -> REST.ServerRelay? {
let relaysWithDistance = relayWithLocations.map {
RelayWithDistance(
relay: $0.relay,
distance: Haversine.distance(
location.latitude,
location.longitude,
$0.serverLocation.latitude,
$0.serverLocation.longitude
)
)
}.sorted {
$0.distance < $1.distance
}.prefix(5)
let relaysGroupedByDistance = Dictionary(grouping: relaysWithDistance, by: { $0.distance })
guard let closetsRelayGroup = relaysGroupedByDistance.min(by: { $0.key < $1.key })?.value else {
return nil
}
var greatestDistance = 0.0
closetsRelayGroup.forEach {
if $0.distance > greatestDistance {
greatestDistance = $0.distance
}
}
let closestRelay = rouletteSelection(
relays: closetsRelayGroup,
weightFunction: { relay in
UInt64(1 + greatestDistance - relay.distance)
})
return closestRelay?.relay
}
}
private static func evaluatePort(
portConstraint: RelayConstraint<UInt16>,
rawPortRanges: [[UInt16]],
numberOfFailedAttempts: UInt
) throws -> UInt16 {
let port = applyPortConstraint(
portConstraint,
rawPortRanges: rawPortRanges,
numberOfFailedAttempts: numberOfFailedAttempts
)
guard let port else {
throw NoRelaysSatisfyingConstraintsError(.invalidPort)
}
return port
}
private static func createMatch(
for relayWithLocation: RelayWithLocation<REST.ServerRelay>,
port: UInt16,
wireguard: REST.ServerWireguardTunnels
) -> RelaySelectorMatch {
let endpoint = MullvadEndpoint(
ipv4Relay: IPv4Endpoint(
ip: relayWithLocation.relay.ipv4AddrIn,
port: port
),
ipv6Relay: nil,
ipv4Gateway: wireguard.ipv4Gateway,
ipv6Gateway: wireguard.ipv6Gateway,
publicKey: relayWithLocation.relay.publicKey
)
return RelaySelectorMatch(
endpoint: endpoint,
relay: relayWithLocation.relay,
location: relayWithLocation.serverLocation
)
}
}
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