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Sources/NetworkProtection/Models/VPNServerSelectionResolver.swift
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|---|---|---|
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| // | ||
| // VPNServerSelectionResolver.swift | ||
| // | ||
| // Copyright © 2024 DuckDuckGo. All rights reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
|
|
||
| import Foundation | ||
|
|
||
| enum VPNServerSelectionResolverError: Error { | ||
| case countryNotFound | ||
| case fetchingLocationsFailed(Error) | ||
| } | ||
|
|
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| protocol VPNServerSelectionResolving { | ||
| func resolvedServerSelectionMethod() async -> NetworkProtectionServerSelectionMethod | ||
| } | ||
|
|
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| final class VPNServerSelectionResolver: VPNServerSelectionResolving { | ||
| private let locationListRepository: NetworkProtectionLocationListRepository | ||
| private let vpnSettings: VPNSettings | ||
|
|
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| init(locationListRepository: NetworkProtectionLocationListRepository, vpnSettings: VPNSettings) { | ||
| self.locationListRepository = locationListRepository | ||
| self.vpnSettings = vpnSettings | ||
| } | ||
|
|
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| /// Address the case where the prefered location becomes unavailable | ||
| /// We fall back to the country, if a city isn't available, | ||
| /// or nearest if the country isn't available | ||
| public func resolvedServerSelectionMethod() async -> NetworkProtectionServerSelectionMethod { | ||
| switch currentServerSelectionMethod { | ||
| case .automatic, .preferredServer, .avoidServer, .failureRecovery: | ||
| return currentServerSelectionMethod | ||
| case .preferredLocation(let networkProtectionSelectedLocation): | ||
| do { | ||
| let location = try await resolveSelectionAgainstAvailableLocations(networkProtectionSelectedLocation) | ||
| return .preferredLocation(location) | ||
| } catch let error as VPNServerSelectionResolverError { | ||
| switch error { | ||
| case .countryNotFound: | ||
| return .automatic | ||
| case .fetchingLocationsFailed: | ||
| return currentServerSelectionMethod | ||
| } | ||
| } catch { | ||
| return currentServerSelectionMethod | ||
| } | ||
| } | ||
| } | ||
|
|
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| private func resolveSelectionAgainstAvailableLocations(_ selection: NetworkProtectionSelectedLocation) async throws -> NetworkProtectionSelectedLocation { | ||
| let availableLocations: [NetworkProtectionLocation] | ||
| do { | ||
| availableLocations = try await locationListRepository.fetchLocationList(cachePolicy: .ignoreCache) | ||
| } catch { | ||
| throw VPNServerSelectionResolverError.fetchingLocationsFailed(error) | ||
| } | ||
|
|
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| let availableCitySelections = availableLocations.flatMap { location in | ||
| location.cities.map { city in NetworkProtectionSelectedLocation(country: location.country, city: city.name) } | ||
| } | ||
|
|
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| if availableCitySelections.contains(selection) { | ||
| return selection | ||
| } | ||
|
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| let selectedCountry = NetworkProtectionSelectedLocation(country: selection.country) | ||
| let availableCountrySelections = availableLocations.map { NetworkProtectionSelectedLocation(country: $0.country) } | ||
| guard availableCountrySelections.contains(selectedCountry) else { | ||
| throw VPNServerSelectionResolverError.countryNotFound | ||
| } | ||
|
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| return selectedCountry | ||
| } | ||
|
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| private var currentServerSelectionMethod: NetworkProtectionServerSelectionMethod { | ||
| var serverSelectionMethod: NetworkProtectionServerSelectionMethod | ||
|
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| switch vpnSettings.selectedLocation { | ||
| case .nearest: | ||
| serverSelectionMethod = .automatic | ||
| case .location(let networkProtectionSelectedLocation): | ||
| serverSelectionMethod = .preferredLocation(networkProtectionSelectedLocation) | ||
| } | ||
|
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| switch vpnSettings.selectedServer { | ||
| case .automatic: | ||
| break | ||
| case .endpoint(let string): | ||
| // Selecting a specific server will override locations setting | ||
| // Only available in debug | ||
| serverSelectionMethod = .preferredServer(serverName: string) | ||
| } | ||
|
|
||
| return serverSelectionMethod | ||
| } | ||
| } |
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59 changes: 59 additions & 0 deletions
59
...NetworkProtectionTestUtils/Repositories/MockNetworkProtectionLocationListRepository.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| // | ||
| // MockNetworkProtectionLocationListRepository.swift | ||
| // | ||
| // Copyright © 2024 DuckDuckGo. All rights reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
|
|
||
| import Foundation | ||
| @testable import NetworkProtection | ||
|
|
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| final class MockNetworkProtectionLocationListRepository: NetworkProtectionLocationListRepository { | ||
| var stubFetchLocationList: [NetworkProtectionLocation] = [] | ||
| var stubFetchLocationListError: Error? | ||
| var spyIgnoreCache: Bool = false | ||
|
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| func fetchLocationList() async throws -> [NetworkProtectionLocation] { | ||
| if let stubFetchLocationListError { | ||
| throw stubFetchLocationListError | ||
| } | ||
| return stubFetchLocationList | ||
| } | ||
|
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| func fetchLocationList(cachePolicy: NetworkProtectionLocationListCachePolicy) async throws -> [NetworkProtectionLocation] { | ||
| switch cachePolicy { | ||
| case .returnCacheElseLoad: | ||
| return try await fetchLocationList() | ||
| case .ignoreCache: | ||
| return try await fetchLocationListIgnoringCache() | ||
| } | ||
| } | ||
|
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| func fetchLocationListIgnoringCache() async throws -> [NetworkProtection.NetworkProtectionLocation] { | ||
| spyIgnoreCache = true | ||
| return try await fetchLocationList() | ||
| } | ||
| } | ||
|
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| extension NetworkProtectionLocation { | ||
| static func testData(country: String = "", cities: [City] = []) -> NetworkProtectionLocation { | ||
| return Self(country: country, cities: cities) | ||
| } | ||
| } | ||
|
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| extension NetworkProtectionLocation.City { | ||
| static func testData(name: String = "") -> NetworkProtectionLocation.City { | ||
| Self(name: name) | ||
| } | ||
| } |
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