109 lines
3.8 KiB
Swift
109 lines
3.8 KiB
Swift
//
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// ArticleThemeDownloader.swift
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// ArticleThemeDownloader
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//
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// Created by Stuart Breckenridge on 20/09/2021.
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// Copyright © 2021 Ranchero Software. All rights reserved.
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//
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import Foundation
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import Zip
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public class ArticleThemeDownloader {
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public enum ArticleThemeDownloaderError: LocalizedError {
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case noThemeFile
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public var errorDescription: String? {
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switch self {
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case .noThemeFile:
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return "There is no NetNewsWire theme available."
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}
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}
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}
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public static let shared = ArticleThemeDownloader()
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private init() {}
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public func handleFile(at location: URL) throws {
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createDownloadDirectoryIfRequired()
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let movedFileLocation = try moveTheme(from: location)
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let unzippedFileLocation = try unzipFile(at: movedFileLocation)
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NotificationCenter.default.post(name: .didEndDownloadingTheme, object: nil, userInfo: ["url" : unzippedFileLocation])
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}
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/// Creates `Application Support/NetNewsWire/Downloads` if needed.
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private func createDownloadDirectoryIfRequired() {
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try? FileManager.default.createDirectory(at: downloadDirectory(), withIntermediateDirectories: true, attributes: nil)
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}
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/// Moves the downloaded `.tmp` file to the `downloadDirectory` and renames it a `.zip`
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/// - Parameter location: The temporary file location.
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/// - Returns: Destination `URL`.
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private func moveTheme(from location: URL) throws -> URL {
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var tmpFileName = location.lastPathComponent
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tmpFileName = tmpFileName.replacingOccurrences(of: ".tmp", with: ".zip")
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let fileUrl = downloadDirectory().appendingPathComponent("\(tmpFileName)")
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try FileManager.default.moveItem(at: location, to: fileUrl)
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return fileUrl
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}
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/// Unzips the zip file
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/// - Parameter location: Location of the zip archive.
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/// - Returns: Enclosed `.nnwtheme` file.
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private func unzipFile(at location: URL) throws -> URL {
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do {
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let unzipDirectory = URL(fileURLWithPath: location.path.replacingOccurrences(of: ".zip", with: ""))
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try Zip.unzipFile(location, destination: unzipDirectory, overwrite: true, password: nil, progress: nil, fileOutputHandler: nil) // Unzips to folder in Application Support/NetNewsWire/Downloads
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try FileManager.default.removeItem(at: location) // Delete zip in Cache
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let themeFilePath = findThemeFile(in: unzipDirectory.path)
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if themeFilePath == nil {
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throw ArticleThemeDownloaderError.noThemeFile
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}
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return URL(fileURLWithPath: unzipDirectory.appendingPathComponent(themeFilePath!).path)
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} catch {
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try? FileManager.default.removeItem(at: location)
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throw error
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}
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}
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/// Performs a deep search of the unzipped direcotry to find the theme file.
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/// - Parameter searchPath: directory to search
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/// - Returns: optional `String`
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private func findThemeFile(in searchPath: String) -> String? {
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if let directoryContents = FileManager.default.enumerator(atPath: searchPath) {
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while let file = directoryContents.nextObject() as? String {
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if file.hasSuffix(".nnwtheme") {
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return file
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}
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}
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}
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return nil
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}
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/// The download directory used by the theme downloader: `Application Suppport/NetNewsWire/Downloads`
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/// - Returns: `URL`
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private func downloadDirectory() -> URL {
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FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask).first!.appendingPathComponent("NetNewsWire/Downloads", isDirectory: true)
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}
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/// Removes downloaded themes, where themes == folders, from `Application Suppport/NetNewsWire/Downloads`.
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public func cleanUp() {
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guard let filenames = try? FileManager.default.contentsOfDirectory(atPath: downloadDirectory().path) else {
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return
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}
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for path in filenames {
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do {
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if FileManager.default.isFolder(atPath: downloadDirectory().appendingPathComponent(path).path) {
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try FileManager.default.removeItem(atPath: downloadDirectory().appendingPathComponent(path).path)
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}
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} catch {
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print(error)
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}
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}
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}
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}
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