mirror of
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103 lines
4.1 KiB
Swift
103 lines
4.1 KiB
Swift
//
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// Copyright 2023 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import Foundation
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import MatrixSDKCrypto
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/// An implementation of `MXCryptoV2Feature` which uses `UserDefaults` to persist the enabled status
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/// of `CryptoSDK`, and which uses feature flags to control rollout availability.
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///
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/// The implementation uses both remote and local feature flags to control the availability of `CryptoSDK`.
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/// Whilst remote is more convenient in that it allows changes to the rollout without new app releases,
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/// it is not available to all users because it requires data tracking user consent. Remote therefore
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/// represents the safer, albeit limited rollout strategy, whereas the local feature flags allows eventually
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/// targetting all users, but each target change requires new app release.
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///
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/// Additionally users can manually enable this feature from the settings if they are not already in the
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/// feature group.
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@objc class CryptoSDKFeature: NSObject, MXCryptoV2Feature {
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@objc static let shared = CryptoSDKFeature()
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var version: String {
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// Will be moved into the olm machine as API
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Bundle(for: OlmMachine.self).infoDictionary?["CFBundleShortVersionString"] as? String ?? ""
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}
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var isEnabled: Bool {
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RiotSettings.shared.enableCryptoSDK
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}
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private static let FeatureName = "ios-crypto-sdk"
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private let remoteFeature: RemoteFeaturesClientProtocol
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private let localFeature: PhasedRolloutFeature
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init(remoteFeature: RemoteFeaturesClientProtocol = PostHogAnalyticsClient.shared) {
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self.remoteFeature = remoteFeature
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self.localFeature = PhasedRolloutFeature(
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name: Self.FeatureName,
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// Local feature is currently set to 0% target, and all availability is fully controlled
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// by the remote feature. Once the remote is fully rolled out, target for local feature will
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// be gradually increased.
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targetPercentage: 0.2
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)
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}
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func enable() {
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RiotSettings.shared.enableCryptoSDK = true
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Analytics.shared.trackCryptoSDKEnabled()
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MXLog.debug("[CryptoSDKFeature] Crypto SDK enabled")
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}
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func enableIfAvailable(forUserId userId: String!) {
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guard !isEnabled else {
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MXLog.debug("[CryptoSDKFeature] enableIfAvailable: Feature is already enabled")
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return
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}
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guard let userId else {
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MXLog.failure("[CryptoSDKFeature] enableIfAvailable: Missing user id")
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return
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}
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guard isFeatureEnabled(userId: userId) else {
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MXLog.debug("[CryptoSDKFeature] enableIfAvailable: Feature is currently not available for this user")
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return
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}
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MXLog.debug("[CryptoSDKFeature] enableIfAvailable: Feature has become available for this user and will be enabled")
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enable()
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}
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@objc func canManuallyEnable(forUserId userId: String!) -> Bool {
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guard let userId else {
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MXLog.failure("[CryptoSDKFeature] canManuallyEnable: Missing user id")
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return false
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}
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// User can manually enable only if not already within the automatic feature group
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return !isFeatureEnabled(userId: userId)
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}
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@objc func reset() {
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RiotSettings.shared.enableCryptoSDK = false
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MXLog.debug("[CryptoSDKFeature] Crypto SDK disabled")
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}
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private func isFeatureEnabled(userId: String) -> Bool {
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remoteFeature.isFeatureEnabled(Self.FeatureName) || localFeature.isEnabled(userId: userId)
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}
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}
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