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// Copyright © 2024 Rangeproof Pty Ltd. All rights reserved.
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import Foundation
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import Combine
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import GRDB
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import SessionUIKit
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import SessionSnodeKit
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import SessionUtilitiesKit
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public extension MessageViewModel {
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struct DeletionBehaviours {
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public enum Actions {
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case individual([Behaviour])
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case multiple([NamedAction])
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var count: Int {
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switch self {
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case .individual: return 1
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case .multiple(let namedActions): return namedActions.count
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}
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}
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}
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public enum Behaviour {
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case markAsDeleted(localOnly: Bool, ids: [Int64])
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case deleteFromDatabase([Int64])
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case cancelPendingSendJobs([Int64])
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case preparedRequest(Network.PreparedRequest<Void>)
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}
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public struct NamedAction {
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public let title: String
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public let isDefault: Bool
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public let accessibility: Accessibility
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let behaviours: [Behaviour]
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init(title: String, isDefault: Bool, accessibility: Accessibility, behaviours: [Behaviour]) {
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self.title = title
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self.isDefault = isDefault
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self.accessibility = accessibility
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self.behaviours = behaviours
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}
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}
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public let title: String
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public let body: String
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public let actions: Actions
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/// Collect the actions and construct a publisher which triggers each action before returning the result
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public func publisherForAction(at index: Int, using dependencies: Dependencies) -> AnyPublisher<Void, Error> {
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guard index >= 0, index < actions.count else {
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return Fail(error: StorageError.objectNotFound).eraseToAnyPublisher()
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}
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let behaviours: [Behaviour] = {
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switch actions {
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case .individual(let actionBehaviours): return actionBehaviours
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case .multiple(let namedActions): return namedActions[index].behaviours
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}
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}()
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var result: AnyPublisher<Void, Error> = Just(())
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.setFailureType(to: Error.self)
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.eraseToAnyPublisher()
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behaviours.forEach { behaviour in
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switch behaviour {
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case .cancelPendingSendJobs(let ids):
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result = result.flatMapStorageWritePublisher(using: dependencies) { db, _ in
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/// Cancel any `messageSend` jobs related to the message we are deleting
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let jobs: [Job] = (try? Job
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.filter(Job.Columns.variant == Job.Variant.messageSend)
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.filter(ids.contains(Job.Columns.interactionId))
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.fetchAll(db))
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.defaulting(to: [])
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jobs.forEach { dependencies[singleton: .jobRunner].removePendingJob($0) }
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_ = try? Job.deleteAll(db, ids: jobs.compactMap { $0.id })
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}
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case .markAsDeleted(let localOnly, let ids):
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result = result.flatMapStorageWritePublisher(using: dependencies) { db, _ in
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try Interaction
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.fetchAll(db, ids: ids)
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.map { $0.markingAsDeleted(localOnly: localOnly) }
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.forEach { try $0.upserted(db) }
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}
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case .deleteFromDatabase(let ids):
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result = result.flatMapStorageWritePublisher(using: dependencies) { db, _ in
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_ = try Interaction
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.filter(ids: ids)
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.deleteAll(db)
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}
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case .preparedRequest(let preparedRequest):
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result = result
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.flatMap { _ in preparedRequest.send(using: dependencies) }
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.map { _, _ in () }
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.eraseToAnyPublisher()
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}
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}
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return result
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}
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}
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}
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public extension MessageViewModel.DeletionBehaviours {
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static func deletionActions(
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for cellViewModels: [MessageViewModel],
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with threadData: SessionThreadViewModel,
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using dependencies: Dependencies
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) -> MessageViewModel.DeletionBehaviours? {
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enum SelectedMessageState {
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case pendingOnly
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case mixedPendingAndSent
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case incomingOnly
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case outgoingOnly
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case deletedOnly
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case controlMessageOnly
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case mixedIncomingAndOutgoing
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case mixedDeletedAndControlMessage
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case mixed
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}
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/// First determine the state of the selected messages
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let state: SelectedMessageState = {
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let allStates: Set<RecipientState.State> = Set(cellViewModels.map { $0.state })
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let allVariants: Set<Interaction.Variant> = Set(cellViewModels.map { $0.variant })
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let allHashes: Set<String> = Set(cellViewModels.compactMap { $0.serverHash ?? $0.openGroupServerMessageId.map { "\($0)" } })
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/// Determine the message types
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let deletedMessageVariants: Set<Interaction.Variant> = Set(Interaction.Variant.allCases.filter { $0.isDeletedMessage })
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let controlMessageVariants: Set<Interaction.Variant> = Set(Interaction.Variant.allCases.filter { $0.isInfoMessage })
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let isIncomingOnly: Bool = (allVariants == [.standardIncoming])
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let isOutgoingOnly: Bool = (allVariants == [.standardOutgoing])
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let isDeletedOnly: Bool = allVariants.subtracting(deletedMessageVariants).isEmpty
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let isControlMessageOnly: Bool = allVariants.subtracting(controlMessageVariants).isEmpty
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switch (isIncomingOnly, isOutgoingOnly, isDeletedOnly, isControlMessageOnly) {
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case (true, false, false, false): return .incomingOnly
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case (false, true, false, false):
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/// Determine the message statuses (if a message doesn't have a `serverHash` or an `openGroupMessageId` then consider
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/// it to be the same as a "pending" message)
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let pendingStates: Set<RecipientState.State> = [.failed, .sending]
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let sentStates: Set<RecipientState.State> = [.sent, .failedToSync, .syncing]
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let isPendingOnly: Bool = allStates.subtracting(pendingStates).isEmpty
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let isSentOnly: Bool = allStates.subtracting(sentStates).isEmpty
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switch (isPendingOnly, isSentOnly, allHashes.count == cellViewModels.count) {
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case (true, false, _): return .pendingOnly
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case (false, true, true): return .outgoingOnly
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default: return .mixedPendingAndSent
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}
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case (false, false, true, false): return .deletedOnly
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case (false, false, false, true): return .controlMessageOnly
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default: break
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}
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/// Handle the combination types
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let isIncomingAndOutgoing: Bool = allVariants.subtracting([.standardIncoming, .standardOutgoing]).isEmpty
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let isDeletedAndControlMessageOnly: Bool = allVariants
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.subtracting(controlMessageVariants)
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.subtracting(deletedMessageVariants)
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.isEmpty
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switch (isIncomingAndOutgoing, isDeletedAndControlMessageOnly) {
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case (true, false): return .mixedIncomingAndOutgoing
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case (false, true): return .mixedDeletedAndControlMessage
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default: return .mixed
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}
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}()
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/// The user can only delete messages which are within the same group of states, either "pending" messages (`failed` & `sending`)
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/// or "sent" messages (all other states), selecting a combination of states is not valid and shouldn't allow deletion
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guard state != .mixedPendingAndSent else { return nil }
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/// The remaining deletion options are more complicated to determine
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return dependencies[singleton: .storage].read { [dependencies] db -> MessageViewModel.DeletionBehaviours? in
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let isAdmin: Bool = {
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switch threadData.threadVariant {
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case .contact: return false
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case .group, .legacyGroup: return (threadData.currentUserIsClosedGroupAdmin == true)
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case .community:
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guard
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let server: String = threadData.openGroupServer,
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let roomToken: String = threadData.openGroupRoomToken
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else { return false }
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return dependencies[singleton: .openGroupManager].isUserModeratorOrAdmin(
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db,
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publicKey: threadData.currentUserSessionId,
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for: roomToken,
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on: server
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)
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}
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}()
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switch (state, isAdmin) {
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/// Support local deletion only in all conversation types when all selcted messages are:
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/// • Pending messages
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/// • Deleted messages
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/// • Control messages
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case (.pendingOnly, _), (.deletedOnly, _), (.controlMessageOnly, _), (.mixedDeletedAndControlMessage, _):
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return MessageViewModel.DeletionBehaviours(
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title: "deleteMessage"
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.putNumber(cellViewModels.count)
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.localized(),
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body: (cellViewModels.count == 1 ?
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"deleteMessageDescriptionDevice".localized() :
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"deleteMessagesDescriptionDevice".localized()
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),
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actions: .individual([
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.cancelPendingSendJobs(cellViewModels.map { $0.id }),
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.deleteFromDatabase(cellViewModels.map { $0.id })
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])
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)
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/// Support local "mark as deleted" in all conversation types when all selcted messages are:
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/// • Incoming messages (when not an admin)
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case (.incomingOnly, false):
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return MessageViewModel.DeletionBehaviours(
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title: "deleteMessage"
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.putNumber(cellViewModels.count)
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.localized(),
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body: (cellViewModels.count == 1 ?
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"deleteMessageDescriptionDevice".localized() :
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"deleteMessagesDescriptionDevice".localized()
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),
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actions: .individual([
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.cancelPendingSendJobs(cellViewModels.map { $0.id }),
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.markAsDeleted(localOnly: true, ids: cellViewModels.map { $0.id })
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])
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)
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/// Support either local deletion or network deletion when:
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/// • All messages were sent by the current user; or
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/// • The current user is an admin
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case (.outgoingOnly, _), (.incomingOnly, true), (.mixedIncomingAndOutgoing, true):
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return MessageViewModel.DeletionBehaviours(
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title: "deleteMessage"
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.putNumber(cellViewModels.count)
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.localized(),
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body: (cellViewModels.count == 1 ?
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"deleteMessageConfirm".localized() :
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"deleteMessagesConfirm".localized()
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),
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actions: .multiple([
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NamedAction(
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title: "deleteMessageDeviceOnly".localized(),
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isDefault: !isAdmin, /// Default to "delete for me" for non-admins
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accessibility: Accessibility(identifier: "Delete for me"),
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behaviours: [
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.cancelPendingSendJobs(cellViewModels.map { $0.id }),
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.markAsDeleted(localOnly: true, ids: cellViewModels.map { $0.id })
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]
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),
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NamedAction(
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title: (threadData.threadIsNoteToSelf ?
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"deleteMessageDevicesAll".localized() :
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"deleteMessageEveryone".localized()
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),
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isDefault: isAdmin, /// Default to "delete for everyone" for admins
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accessibility: Accessibility(identifier: "Delete for everyone"),
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behaviours: try {
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/// The non-local deletion behaviours differ depending on the type of conversation
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switch (threadData.threadVariant, isAdmin) {
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/// **Note to Self or Contact Conversation**
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/// Delete from all participant devices via an `UnsendRequest` (these will trigger their own sync messages)
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/// Delete from the current users swarm
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/// Delete from the current device
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case (.contact, _):
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let serverHashes: [String] = cellViewModels.compactMap { $0.serverHash }
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let unsendRequests: [Network.PreparedRequest<Void>] = try cellViewModels.map { model in
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try MessageSender.preparedSend(
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db,
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message: UnsendRequest(
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timestamp: UInt64(model.timestampMs),
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author: (model.variant == .standardOutgoing ?
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threadData.currentUserSessionId :
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model.authorId
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)
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)
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.with(
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expiresInSeconds: model.expiresInSeconds,
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expiresStartedAtMs: model.expiresStartedAtMs
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),
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to: .contact(publicKey: model.threadId),
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namespace: .default,
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interactionId: nil,
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fileIds: [],
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using: dependencies
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)
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}
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/// Batch requests have a limited number of subrequests so make sure to chunk
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/// the unsend requests accordingly
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return [.cancelPendingSendJobs(cellViewModels.map { $0.id })]
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.appending(
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contentsOf: try unsendRequests
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.chunked(by: Network.BatchRequest.childRequestLimit)
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.map { unsendRequestChunk in
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.preparedRequest(
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try SnodeAPI.preparedBatch(
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requests: unsendRequestChunk,
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requireAllBatchResponses: false,
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swarmPublicKey: threadData.threadId,
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using: dependencies
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).map { _, _ in () }
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)
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}
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)
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.appending(
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.preparedRequest(
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try SnodeAPI.preparedDeleteMessages(
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serverHashes: serverHashes,
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requireSuccessfulDeletion: false,
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authMethod: try Authentication.with(
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db,
|
|
|
|
|
swarmPublicKey: threadData.currentUserSessionId,
|
|
|
|
|
using: dependencies
|
|
|
|
|
),
|
|
|
|
|
using: dependencies
|
|
|
|
|
)
|
|
|
|
|
.map { _, _ in () }
|
|
|
|
|
)
|
|
|
|
|
)
|
|
|
|
|
.appending(.markAsDeleted(localOnly: false, ids: cellViewModels.map { $0.id }))
|
|
|
|
|
|
|
|
|
|
/// **Legacy Group Conversation**
|
|
|
|
|
/// Delete from all participant devices via an `UnsendRequest`
|
|
|
|
|
/// Delete from the current device
|
|
|
|
|
///
|
|
|
|
|
/// **Note:** We **cannot** delete from the legacy group swarm
|
|
|
|
|
case (.legacyGroup, _):
|
|
|
|
|
let unsendRequests: [Network.PreparedRequest<Void>] = try cellViewModels.map { model in
|
|
|
|
|
try MessageSender.preparedSend(
|
|
|
|
|
db,
|
|
|
|
|
message: UnsendRequest(
|
|
|
|
|
timestamp: UInt64(model.timestampMs),
|
|
|
|
|
author: (model.variant == .standardOutgoing ?
|
|
|
|
|
threadData.currentUserSessionId :
|
|
|
|
|
model.authorId
|
|
|
|
|
)
|
|
|
|
|
)
|
|
|
|
|
.with(
|
|
|
|
|
expiresInSeconds: model.expiresInSeconds,
|
|
|
|
|
expiresStartedAtMs: model.expiresStartedAtMs
|
|
|
|
|
),
|
|
|
|
|
to: .closedGroup(groupPublicKey: model.threadId),
|
|
|
|
|
namespace: .legacyClosedGroup,
|
|
|
|
|
interactionId: nil,
|
|
|
|
|
fileIds: [],
|
|
|
|
|
using: dependencies
|
|
|
|
|
)
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/// Batch requests have a limited number of subrequests so make sure to chunk
|
|
|
|
|
/// the unsend requests accordingly
|
|
|
|
|
return [.cancelPendingSendJobs(cellViewModels.map { $0.id })]
|
|
|
|
|
.appending(
|
|
|
|
|
contentsOf: try unsendRequests
|
|
|
|
|
.chunked(by: Network.BatchRequest.childRequestLimit)
|
|
|
|
|
.map { unsendRequestChunk in
|
|
|
|
|
.preparedRequest(
|
|
|
|
|
try SnodeAPI.preparedBatch(
|
|
|
|
|
requests: unsendRequestChunk,
|
|
|
|
|
requireAllBatchResponses: false,
|
|
|
|
|
swarmPublicKey: threadData.threadId,
|
|
|
|
|
using: dependencies
|
|
|
|
|
).map { _, _ in () }
|
|
|
|
|
)
|
|
|
|
|
}
|
|
|
|
|
)
|
|
|
|
|
.appending(.markAsDeleted(localOnly: false, ids: cellViewModels.map { $0.id }))
|
|
|
|
|
|
|
|
|
|
/// **Group Conversation for Non Admin**
|
|
|
|
|
/// Delete from all participant devices via an `GroupUpdateDeleteMemberContentMessage`
|
|
|
|
|
/// Delete from the current device
|
|
|
|
|
case (.group, false):
|
|
|
|
|
let serverHashes: [String] = cellViewModels.compactMap { $0.serverHash }
|
|
|
|
|
|
|
|
|
|
return [
|
|
|
|
|
.cancelPendingSendJobs(cellViewModels.map { $0.id }),
|
|
|
|
|
/// **Note:** No signature for member delete content
|
|
|
|
|
.preparedRequest(try MessageSender
|
|
|
|
|
.preparedSend(
|
|
|
|
|
db,
|
|
|
|
|
message: GroupUpdateDeleteMemberContentMessage(
|
|
|
|
|
memberSessionIds: [],
|
|
|
|
|
messageHashes: serverHashes,
|
|
|
|
|
sentTimestampMs: dependencies[cache: .snodeAPI].currentOffsetTimestampMs(),
|
|
|
|
|
authMethod: nil,
|
|
|
|
|
using: dependencies
|
|
|
|
|
),
|
|
|
|
|
to: .closedGroup(groupPublicKey: threadData.threadId),
|
|
|
|
|
namespace: .groupMessages,
|
|
|
|
|
interactionId: nil,
|
|
|
|
|
fileIds: [],
|
|
|
|
|
using: dependencies
|
|
|
|
|
)),
|
|
|
|
|
.markAsDeleted(localOnly: false, ids: cellViewModels.map { $0.id })
|
|
|
|
|
]
|
|
|
|
|
|
|
|
|
|
/// **Group Conversation for Admin**
|
|
|
|
|
/// Delete from all participant devices via an `GroupUpdateDeleteMemberContentMessage`
|
|
|
|
|
/// Delete from the group swarm
|
|
|
|
|
/// Delete from the current device
|
|
|
|
|
case (.group, true):
|
|
|
|
|
guard
|
|
|
|
|
let ed25519SecretKey: Data = try? ClosedGroup
|
|
|
|
|
.filter(id: threadData.threadId)
|
|
|
|
|
.select(.groupIdentityPrivateKey)
|
|
|
|
|
.asRequest(of: Data.self)
|
|
|
|
|
.fetchOne(db)
|
|
|
|
|
else {
|
|
|
|
|
Log.error("[ConversationViewModel] Failed to retrieve groupIdentityPrivateKey when trying to delete messages from group.")
|
|
|
|
|
throw StorageError.objectNotFound
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
let serverHashes: [String] = cellViewModels.compactMap { $0.serverHash }
|
|
|
|
|
|
|
|
|
|
return [
|
|
|
|
|
.cancelPendingSendJobs(cellViewModels.map { $0.id }),
|
|
|
|
|
.preparedRequest(try MessageSender
|
|
|
|
|
.preparedSend(
|
|
|
|
|
db,
|
|
|
|
|
message: GroupUpdateDeleteMemberContentMessage(
|
|
|
|
|
memberSessionIds: [],
|
|
|
|
|
messageHashes: serverHashes,
|
|
|
|
|
sentTimestampMs: dependencies[cache: .snodeAPI].currentOffsetTimestampMs(),
|
|
|
|
|
authMethod: Authentication.groupAdmin(
|
|
|
|
|
groupSessionId: SessionId(.group, hex: threadData.threadId),
|
|
|
|
|
ed25519SecretKey: Array(ed25519SecretKey)
|
|
|
|
|
),
|
|
|
|
|
using: dependencies
|
|
|
|
|
),
|
|
|
|
|
to: .closedGroup(groupPublicKey: threadData.threadId),
|
|
|
|
|
namespace: .groupMessages,
|
|
|
|
|
interactionId: nil,
|
|
|
|
|
fileIds: [],
|
|
|
|
|
using: dependencies
|
|
|
|
|
)),
|
|
|
|
|
.preparedRequest(try SnodeAPI
|
|
|
|
|
.preparedDeleteMessages(
|
|
|
|
|
serverHashes: serverHashes,
|
|
|
|
|
requireSuccessfulDeletion: false,
|
|
|
|
|
authMethod: Authentication.groupAdmin(
|
|
|
|
|
groupSessionId: SessionId(.group, hex: threadData.threadId),
|
|
|
|
|
ed25519SecretKey: Array(ed25519SecretKey)
|
|
|
|
|
),
|
|
|
|
|
using: dependencies
|
|
|
|
|
)
|
|
|
|
|
.map { _, _ in () }),
|
|
|
|
|
.markAsDeleted(localOnly: false, ids: cellViewModels.map { $0.id })
|
|
|
|
|
]
|
|
|
|
|
|
|
|
|
|
/// **Community Conversation**
|
|
|
|
|
/// Delete from the SOGS
|
|
|
|
|
/// Delete from the current device
|
|
|
|
|
case (.community, _):
|
|
|
|
|
guard
|
|
|
|
|
let server: String = threadData.openGroupServer,
|
|
|
|
|
let roomToken: String = threadData.openGroupRoomToken
|
|
|
|
|
else {
|
|
|
|
|
Log.error("[ConversationViewModel] Failed to retrieve community info when trying to delete messages.")
|
|
|
|
|
throw StorageError.objectNotFound
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
let deleteRequests: [Network.PreparedRequest] = try cellViewModels
|
|
|
|
|
.compactMap { $0.openGroupServerMessageId }
|
|
|
|
|
.map { messageId in
|
|
|
|
|
try OpenGroupAPI
|
|
|
|
|
.preparedMessageDelete(
|
|
|
|
|
db,
|
|
|
|
|
id: messageId,
|
|
|
|
|
in: roomToken,
|
|
|
|
|
on: server,
|
|
|
|
|
using: dependencies
|
|
|
|
|
)
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/// Batch requests have a limited number of subrequests so make sure to chunk
|
|
|
|
|
/// the unsend requests accordingly
|
|
|
|
|
return [.cancelPendingSendJobs(cellViewModels.map { $0.id })]
|
|
|
|
|
.appending(
|
|
|
|
|
contentsOf: try deleteRequests
|
|
|
|
|
.chunked(by: Network.BatchRequest.childRequestLimit)
|
|
|
|
|
.map { deleteRequestsChunk in
|
|
|
|
|
.preparedRequest(
|
|
|
|
|
try OpenGroupAPI.preparedBatch(
|
|
|
|
|
db,
|
|
|
|
|
server: server,
|
|
|
|
|
requests: deleteRequestsChunk,
|
|
|
|
|
using: dependencies
|
|
|
|
|
)
|
|
|
|
|
.map { _, _ in () }
|
|
|
|
|
)
|
|
|
|
|
}
|
|
|
|
|
)
|
|
|
|
|
.appending(.deleteFromDatabase(cellViewModels.map { $0.id }))
|
|
|
|
|
}
|
|
|
|
|
}()
|
|
|
|
|
)
|
|
|
|
|
])
|
|
|
|
|
)
|
|
|
|
|
|
|
|
|
|
/// These remaining cases are not supported
|
|
|
|
|
case (.mixedPendingAndSent, _), (.mixed, _), (.mixedIncomingAndOutgoing, false): return nil
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
