download themes using url scheme

this build enables iOS functionality only.

iOS/SceneDelegate.swift

@@ -9,15 +9,16 @@
 import UIKit
 import UserNotifications
 import Account
+import Zip
 
-class SceneDelegate: UIResponder, UIWindowSceneDelegate {
+class SceneDelegate: UIResponder, UIWindowSceneDelegate, URLSessionDownloadDelegate {
 	
-    var window: UIWindow?
+	var window: UIWindow?
 	var coordinator = SceneCoordinator()
 	
-    // UIWindowScene delegate
-    
-    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
+	// UIWindowScene delegate
+	
+	func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
 		
 		window = UIWindow(windowScene: scene as! UIWindowScene)
 		window!.tintColor = AppAssets.primaryAccentColor
@@ -46,12 +47,12 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
 			return
 		}
 		
-        if let userActivity = connectionOptions.userActivities.first ?? session.stateRestorationActivity {
+		if let userActivity = connectionOptions.userActivities.first ?? session.stateRestorationActivity {
 			coordinator.handle(userActivity)
 		}
 		
 		window!.makeKeyAndVisible()
-    }
+	}
 	
 	func windowScene(_ windowScene: UIWindowScene, performActionFor shortcutItem: UIApplicationShortcutItem, completionHandler: @escaping (Bool) -> Void) {
 		appDelegate.resumeDatabaseProcessingIfNecessary()
@@ -79,9 +80,9 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
 		coordinator.resetFocus()
 	}
 	
-    func stateRestorationActivity(for scene: UIScene) -> NSUserActivity? {
+	func stateRestorationActivity(for scene: UIScene) -> NSUserActivity? {
 		return coordinator.stateRestorationActivity
-    }
+	}
 	
 	// API
 	
@@ -89,7 +90,7 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
 		appDelegate.resumeDatabaseProcessingIfNecessary()
 		coordinator.handle(response)
 	}
-
+	
 	func suspend() {
 		coordinator.suspend()
 	}
@@ -165,8 +166,69 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
 			let filename = context.url.standardizedFileURL.path
 			if filename.hasSuffix(ArticleTheme.nnwThemeSuffix) {
 				self.coordinator.importTheme(filename: filename)
+				return
 			}
 			
+			// Handle theme URLs: netnewswire://theme/add?url={url}
+			guard let comps = URLComponents(url: context.url, resolvingAgainstBaseURL: false),
+				  "theme" == comps.host,
+				 let queryItems = comps.queryItems else {
+				return
+			}
+			
+			if let providedThemeURL = queryItems.first(where: { $0.name == "url" })?.value {
+				if let themeURL = URL(string: providedThemeURL) {
+					let request = URLRequest(url: themeURL)
+					let session = URLSession(configuration: .default, delegate: self, delegateQueue: nil)
+					let downloadTask = session.downloadTask(with: request)
+					downloadTask.resume()
+				} else {
+					print("No theme URL")
+					return
+				}
+			} else {
+				return
+			}
+			
+		}
+	}
+	
+	// MARK: - URLSessionDownloadDelegate
+	
+	func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
+		var downloadDirectory = FileManager.default.urls(for: .downloadsDirectory, in: .userDomainMask).first!
+		try? FileManager.default.createDirectory(at: downloadDirectory, withIntermediateDirectories: true, attributes: nil)
+		let tmpFileName = UUID().uuidString + ".zip"
+		downloadDirectory.appendPathComponent("\(tmpFileName)")
+		
+		do {
+			try FileManager.default.moveItem(at: location, to: downloadDirectory)
+		
+			var unzippedDir = downloadDirectory
+			unzippedDir = unzippedDir.deletingLastPathComponent()
+			unzippedDir.appendPathComponent("newtheme.nnwtheme")
+			
+			try Zip.unzipFile(downloadDirectory, destination: unzippedDir, overwrite: true, password: nil, progress: nil, fileOutputHandler: nil)
+			try FileManager.default.removeItem(at: downloadDirectory)
+			
+			let decoder = PropertyListDecoder()
+			let plistURL = URL(fileURLWithPath: unzippedDir.appendingPathComponent("Info.plist").path)
+			
+			let data = try Data(contentsOf: plistURL)
+			let plist = try decoder.decode(ArticleThemePlist.self, from: data)
+			
+			// rename
+			var renamedUnzippedDir = unzippedDir.deletingLastPathComponent()
+			renamedUnzippedDir.appendPathComponent(plist.name + ".nnwtheme")
+			if FileManager.default.fileExists(atPath: renamedUnzippedDir.path) {
+				try FileManager.default.removeItem(at: renamedUnzippedDir)
+			}
+			try FileManager.default.moveItem(at: unzippedDir, to: renamedUnzippedDir)
+			DispatchQueue.main.async {
+				self.coordinator.importTheme(filename: renamedUnzippedDir.path)
+			}
+		} catch {
+			print(error)
 		}
 	}