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//
// DestinationDescriber.swift
// MullvadVPN
//
// Created by Andrew Bulhak on 2025-01-20.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
// A source of truth for converting an exit relay destination (i.e., a relay or list) into a name
import MullvadREST
import MullvadSettings
import MullvadTypes
protocol DestinationDescribing {
func describe(_ destination: UserSelectedRelays) -> String?
}
struct DestinationDescriber: DestinationDescribing {
let relayCache: RelayCacheProtocol
let customListRepository: CustomListRepositoryProtocol
public init(
relayCache: RelayCacheProtocol,
customListRepository: CustomListRepositoryProtocol
) {
self.relayCache = relayCache
self.customListRepository = customListRepository
}
private func customListDescription(_ destination: UserSelectedRelays) -> String? {
// We only return a description for the list if the user has selected the
// entire list. If they have only selected relays/locations from it,
// we show those as if they selected them from elsewhere.
guard
let customListSelection = destination.customListSelection,
customListSelection.isList,
let customList = customListRepository.fetch(by: customListSelection.listId)
else { return nil }
return customList.name
}
private func describeRelayLocation(
_ locationSpec: RelayLocation,
usingRelayWithLocation serverLocation: Location
) -> String {
switch locationSpec {
case .country: serverLocation.country
case .city: serverLocation.city
case let .hostname(_, _, hostname):
"\(serverLocation.city) (\(hostname))"
}
}
private func relayDescription(_ destination: UserSelectedRelays) -> String? {
guard
let location = destination.locations.first,
let cachedRelays = try? relayCache.read().relays
else { return nil }
let locatedRelays = RelayWithLocation.locateRelays(
relays: cachedRelays.wireguard.relays,
locations: cachedRelays.locations
)
guard
let matchingRelay =
(locatedRelays.first {
$0.matches(location: location)
})
else { return nil }
return describeRelayLocation(location, usingRelayWithLocation: matchingRelay.serverLocation)
}
func describe(_ destination: UserSelectedRelays) -> String? {
customListDescription(destination) ?? relayDescription(destination)
}
}
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