metatext/Shared/Services/IdentitiesService.swift
2020-08-12 00:24:39 -07:00

146 lines
5.5 KiB
Swift

// Copyright © 2020 Metabolist. All rights reserved.
import Foundation
import Combine
class IdentitiesService {
@Published var mostRecentlyUsedIdentityID: UUID?
private let identityDatabase: IdentityDatabase
private let environment: AppEnvironment
init(identityDatabase: IdentityDatabase, environment: AppEnvironment) {
self.identityDatabase = identityDatabase
self.environment = environment
identityDatabase.mostRecentlyUsedIdentityIDObservation()
.replaceError(with: nil)
.assign(to: &$mostRecentlyUsedIdentityID)
}
}
extension IdentitiesService {
func identityService(id: UUID) throws -> IdentityService {
try IdentityService(identityID: id,
identityDatabase: identityDatabase,
environment: environment)
}
func createIdentity(id: UUID, instanceURL: URL) -> AnyPublisher<Void, Error> {
identityDatabase.createIdentity(id: id, url: instanceURL)
}
func authorizeIdentity(id: UUID, instanceURL: URL) -> AnyPublisher<Void, Error> {
let secretsService = SecretsService(identityID: id, keychainServiceType: environment.keychainServiceType)
let authenticationService = AuthenticationService(environment: environment)
return authenticationService.authorizeApp(instanceURL: instanceURL)
.tryMap { appAuthorization -> (URL, AppAuthorization) in
try secretsService.set(appAuthorization.clientId, forItem: .clientID)
try secretsService.set(appAuthorization.clientSecret, forItem: .clientSecret)
return (instanceURL, appAuthorization)
}
.flatMap(authenticationService.authenticate(instanceURL:appAuthorization:))
.tryMap { accessToken -> Void in
try secretsService.set(accessToken.accessToken, forItem: .accessToken)
return ()
}
.eraseToAnyPublisher()
}
func deleteIdentity(id: UUID) -> AnyPublisher<Void, Error> {
let environment = self.environment
return identityDatabase.deleteIdentity(id: id)
.tryMap { _ -> Void in
try SecretsService(
identityID: id,
keychainServiceType: environment.keychainServiceType)
.deleteAllItems()
return ()
}
.eraseToAnyPublisher()
}
func updatePushSubscription(
identityID: UUID,
instanceURL: URL,
deviceToken: String,
alerts: PushSubscription.Alerts?) -> AnyPublisher<Void, Error> {
let secretsService = SecretsService(
identityID: identityID,
keychainServiceType: environment.keychainServiceType)
let accessTokenOptional: String?
do {
accessTokenOptional = try secretsService.item(.accessToken) as String?
} catch {
return Fail(error: error).eraseToAnyPublisher()
}
guard let accessToken: String = accessTokenOptional
else { return Empty().eraseToAnyPublisher() }
let publicKey: String
let auth: String
do {
publicKey = try secretsService.generatePushKeyAndReturnPublicKey().base64EncodedString()
auth = try secretsService.generatePushAuth().base64EncodedString()
} catch {
return Fail(error: error).eraseToAnyPublisher()
}
let networkClient = MastodonClient(session: environment.session)
networkClient.instanceURL = instanceURL
networkClient.accessToken = accessToken
let endpoint = Self.pushSubscriptionEndpointURL
.appendingPathComponent(deviceToken)
.appendingPathComponent(identityID.uuidString)
return networkClient.request(
PushSubscriptionEndpoint.create(
endpoint: endpoint,
publicKey: publicKey,
auth: auth,
follow: alerts?.follow ?? true,
favourite: alerts?.favourite ?? true,
reblog: alerts?.reblog ?? true,
mention: alerts?.mention ?? true,
poll: alerts?.poll ?? true))
.map { (deviceToken, $0.alerts, identityID) }
.flatMap(identityDatabase.updatePushSubscription(deviceToken:alerts:forIdentityID:))
.eraseToAnyPublisher()
}
func updatePushSubscriptions(deviceToken: String) -> AnyPublisher<Void, Error> {
identityDatabase.identitiesWithOutdatedDeviceTokens(deviceToken: deviceToken)
.flatMap { identities -> Publishers.MergeMany<AnyPublisher<Void, Never>> in
Publishers.MergeMany(
identities.map { [weak self] in
guard let self = self else { return Empty().eraseToAnyPublisher() }
return self.updatePushSubscription(
identityID: $0.id,
instanceURL: $0.url,
deviceToken: deviceToken,
alerts: $0.pushSubscriptionAlerts)
.catch { _ in Empty() } // can't let one failure stop the pipeline
.eraseToAnyPublisher()
})
}
.eraseToAnyPublisher()
}
}
private extension IdentitiesService {
#if DEBUG
static let pushSubscriptionEndpointURL = URL(string: "https://metatext-apns.metabolist.com/push?sandbox=true")!
#else
static let pushSubscriptionEndpointURL = URL(string: "https://metatext-apns.metabolist.com/push")!
#endif
}