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| 1 | +// |
| 2 | +// LinkedFolderWatcher.swift |
| 3 | +// TablePro |
| 4 | +// |
| 5 | +// Watches linked folders for .tablepro connection files. |
| 6 | +// Rescans on filesystem changes with 1s debounce. |
| 7 | +// |
| 8 | + |
| 9 | +import CryptoKit |
| 10 | +import Foundation |
| 11 | +import os |
| 12 | + |
| 13 | +struct LinkedConnection: Identifiable { |
| 14 | + let id: UUID |
| 15 | + let connection: ExportableConnection |
| 16 | + let folderId: UUID |
| 17 | + let sourceFileURL: URL |
| 18 | +} |
| 19 | + |
| 20 | +@MainActor |
| 21 | +@Observable |
| 22 | +final class LinkedFolderWatcher { |
| 23 | + static let shared = LinkedFolderWatcher() |
| 24 | + private static let logger = Logger(subsystem: "com.TablePro", category: "LinkedFolderWatcher") |
| 25 | + |
| 26 | + private(set) var linkedConnections: [LinkedConnection] = [] |
| 27 | + private var watchSources: [UUID: DispatchSourceFileSystemObject] = [:] |
| 28 | + private var debounceTask: Task<Void, Never>? |
| 29 | + |
| 30 | + private init() {} |
| 31 | + |
| 32 | + func start() { |
| 33 | + guard LicenseManager.shared.isFeatureAvailable(.linkedFolders) else { return } |
| 34 | + let folders = LinkedFolderStorage.shared.loadFolders() |
| 35 | + scheduleScan(folders) |
| 36 | + setupWatchers(for: folders) |
| 37 | + } |
| 38 | + |
| 39 | + func stop() { |
| 40 | + cancelAllWatchers() |
| 41 | + debounceTask?.cancel() |
| 42 | + debounceTask = nil |
| 43 | + } |
| 44 | + |
| 45 | + func reload() { |
| 46 | + stop() |
| 47 | + start() |
| 48 | + } |
| 49 | + |
| 50 | + // MARK: - Scanning (off main thread) |
| 51 | + |
| 52 | + private func scheduleScan(_ folders: [LinkedFolder]) { |
| 53 | + debounceTask?.cancel() |
| 54 | + debounceTask = Task { @MainActor [weak self] in |
| 55 | + let results = await Self.scanFoldersAsync(folders) |
| 56 | + self?.linkedConnections = results |
| 57 | + NotificationCenter.default.post(name: .linkedFoldersDidUpdate, object: nil) |
| 58 | + } |
| 59 | + } |
| 60 | + |
| 61 | + private func scheduleDebouncedRescan() { |
| 62 | + debounceTask?.cancel() |
| 63 | + debounceTask = Task { @MainActor [weak self] in |
| 64 | + try? await Task.sleep(for: .seconds(1)) |
| 65 | + guard !Task.isCancelled else { return } |
| 66 | + let folders = LinkedFolderStorage.shared.loadFolders() |
| 67 | + let results = await Self.scanFoldersAsync(folders) |
| 68 | + self?.linkedConnections = results |
| 69 | + NotificationCenter.default.post(name: .linkedFoldersDidUpdate, object: nil) |
| 70 | + } |
| 71 | + } |
| 72 | + |
| 73 | + /// Scans folders on a background thread to avoid blocking the main actor. |
| 74 | + private nonisolated static func scanFoldersAsync(_ folders: [LinkedFolder]) async -> [LinkedConnection] { |
| 75 | + await Task.detached(priority: .utility) { |
| 76 | + scanFolders(folders) |
| 77 | + }.value |
| 78 | + } |
| 79 | + |
| 80 | + /// Pure scanning logic. Runs on any thread. |
| 81 | + private nonisolated static func scanFolders(_ folders: [LinkedFolder]) -> [LinkedConnection] { |
| 82 | + var results: [LinkedConnection] = [] |
| 83 | + let fm = FileManager.default |
| 84 | + |
| 85 | + for folder in folders where folder.isEnabled { |
| 86 | + let expandedPath = folder.expandedPath |
| 87 | + guard fm.fileExists(atPath: expandedPath) else { |
| 88 | + logger.warning("Linked folder not found: \(expandedPath, privacy: .public)") |
| 89 | + continue |
| 90 | + } |
| 91 | + |
| 92 | + guard let contents = try? fm.contentsOfDirectory(atPath: expandedPath) else { |
| 93 | + logger.warning("Cannot read linked folder: \(expandedPath, privacy: .public)") |
| 94 | + continue |
| 95 | + } |
| 96 | + |
| 97 | + for filename in contents where filename.hasSuffix(".tablepro") { |
| 98 | + let fileURL = URL(fileURLWithPath: expandedPath).appendingPathComponent(filename) |
| 99 | + guard let data = try? Data(contentsOf: fileURL) else { continue } |
| 100 | + |
| 101 | + if ConnectionExportCrypto.isEncrypted(data) { continue } |
| 102 | + |
| 103 | + guard let envelope = try? ConnectionExportService.decodeData(data) else { continue } |
| 104 | + |
| 105 | + for exportable in envelope.connections { |
| 106 | + let stableId = stableId(folderId: folder.id, connection: exportable) |
| 107 | + results.append(LinkedConnection( |
| 108 | + id: stableId, |
| 109 | + connection: exportable, |
| 110 | + folderId: folder.id, |
| 111 | + sourceFileURL: fileURL |
| 112 | + )) |
| 113 | + } |
| 114 | + } |
| 115 | + } |
| 116 | + |
| 117 | + return results |
| 118 | + } |
| 119 | + |
| 120 | + // MARK: - Watchers |
| 121 | + |
| 122 | + private func setupWatchers(for folders: [LinkedFolder]) { |
| 123 | + cancelAllWatchers() |
| 124 | + |
| 125 | + for folder in folders where folder.isEnabled { |
| 126 | + let expandedPath = folder.expandedPath |
| 127 | + let fd = open(expandedPath, O_EVTONLY) |
| 128 | + guard fd >= 0 else { |
| 129 | + Self.logger.warning("Cannot open linked folder for watching: \(expandedPath, privacy: .public)") |
| 130 | + continue |
| 131 | + } |
| 132 | + |
| 133 | + let source = DispatchSource.makeFileSystemObjectSource( |
| 134 | + fileDescriptor: fd, |
| 135 | + eventMask: [.write, .delete, .rename], |
| 136 | + queue: .global(qos: .utility) |
| 137 | + ) |
| 138 | + |
| 139 | + source.setEventHandler { [weak self] in |
| 140 | + Task { @MainActor [weak self] in |
| 141 | + self?.scheduleDebouncedRescan() |
| 142 | + } |
| 143 | + } |
| 144 | + |
| 145 | + source.setCancelHandler { |
| 146 | + close(fd) |
| 147 | + } |
| 148 | + |
| 149 | + watchSources[folder.id] = source |
| 150 | + source.resume() |
| 151 | + } |
| 152 | + } |
| 153 | + |
| 154 | + private func cancelAllWatchers() { |
| 155 | + for (_, source) in watchSources { |
| 156 | + source.cancel() |
| 157 | + } |
| 158 | + watchSources.removeAll() |
| 159 | + } |
| 160 | + |
| 161 | + // MARK: - Stable IDs (SHA-256 based, deterministic across launches) |
| 162 | + |
| 163 | + private nonisolated static func stableId(folderId: UUID, connection: ExportableConnection) -> UUID { |
| 164 | + let key = "\(folderId.uuidString)|\(connection.name)|\(connection.host)|\(connection.port)|\(connection.type)" |
| 165 | + let digest = SHA256.hash(data: Data(key.utf8)) |
| 166 | + var bytes = Array(digest.prefix(16)) |
| 167 | + // Set UUID version 5 and variant bits |
| 168 | + bytes[6] = (bytes[6] & 0x0F) | 0x50 |
| 169 | + bytes[8] = (bytes[8] & 0x3F) | 0x80 |
| 170 | + return UUID(uuid: ( |
| 171 | + bytes[0], bytes[1], bytes[2], bytes[3], |
| 172 | + bytes[4], bytes[5], bytes[6], bytes[7], |
| 173 | + bytes[8], bytes[9], bytes[10], bytes[11], |
| 174 | + bytes[12], bytes[13], bytes[14], bytes[15] |
| 175 | + )) |
| 176 | + } |
| 177 | +} |
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