74 lines
2.4 KiB
Swift
74 lines
2.4 KiB
Swift
import AppKit
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import Foundation
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/// フォルダの選択と、サンドボックス下でのアクセス権の保持を担う。
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///
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/// `NSOpenPanel` で選んだフォルダは配下ごとアクセスが許可される。security-scoped bookmark を
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/// 保存しておくと、次回起動時に同じフォルダをそのまま開き直せる。
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@MainActor
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final class FolderAccess {
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private static let bookmarkKey = "lastFolderBookmark"
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private var accessedURL: URL?
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/// フォルダ選択パネルを出す。キャンセルされたら nil。
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func choose(startingAt current: URL?) -> URL? {
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let panel = NSOpenPanel()
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panel.canChooseFiles = false
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panel.canChooseDirectories = true
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panel.allowsMultipleSelection = false
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panel.prompt = "このフォルダを調べる"
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panel.message = "似た写真を探すフォルダを選んでください"
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if let current { panel.directoryURL = current }
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guard panel.runModal() == .OK, let url = panel.url else { return nil }
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beginAccess(to: url)
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saveBookmark(for: url)
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return url
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}
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/// 前回のフォルダを復元する。無ければ nil。
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func restorePrevious() -> URL? {
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guard let data = UserDefaults.standard.data(forKey: Self.bookmarkKey) else { return nil }
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var isStale = false
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guard let url = try? URL(
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resolvingBookmarkData: data,
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options: .withSecurityScope,
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relativeTo: nil,
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bookmarkDataIsStale: &isStale
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) else {
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UserDefaults.standard.removeObject(forKey: Self.bookmarkKey)
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return nil
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}
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guard FileManager.default.fileExists(atPath: url.path) else { return nil }
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beginAccess(to: url)
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if isStale { saveBookmark(for: url) }
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return url
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}
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func releaseAccess() {
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accessedURL?.stopAccessingSecurityScopedResource()
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accessedURL = nil
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}
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// MARK: - 内部
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private func beginAccess(to url: URL) {
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releaseAccess()
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if url.startAccessingSecurityScopedResource() {
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accessedURL = url
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}
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}
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private func saveBookmark(for url: URL) {
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guard let data = try? url.bookmarkData(
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options: .withSecurityScope,
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includingResourceValuesForKeys: nil,
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relativeTo: nil
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) else { return }
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UserDefaults.standard.set(data, forKey: Self.bookmarkKey)
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}
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}
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