snapshot of https://github.com/tauri-apps/plugins-workspace.git (v2, 2026-09-23; blobs > 131072B omitted)

plugins/dialog/ios/Sources/FilePickerController.swift

@@ -0,0 +1,253 @@
+// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+import UIKit
+import MobileCoreServices
+import PhotosUI
+import Photos
+import Tauri
+
+public class FilePickerController: NSObject {
+  var plugin: DialogPlugin
+    
+	init(_ dialogPlugin: DialogPlugin) {
+		plugin = dialogPlugin
+	}
+
+	private func dismissViewController(_ viewControllerToPresent: UIViewController, completion: (() -> Void)? = nil) {
+		viewControllerToPresent.dismiss(animated: true, completion: completion)
+	}
+
+	public func getModifiedAtFromUrl(_ url: URL) -> Int? {
+		do {
+			let attributes = try FileManager.default.attributesOfItem(atPath: url.path)
+			if let modifiedDateInSec = (attributes[.modificationDate] as? Date)?.timeIntervalSince1970 {
+					return Int(modifiedDateInSec * 1000.0)
+			} else {
+					return nil
+			}
+		} catch let error as NSError {
+			Logger.error("getModifiedAtFromUrl failed", error.localizedDescription)
+			return nil
+    }
+  }
+
+	public func getMimeTypeFromUrl(_ url: URL) -> String {
+		let fileExtension = url.pathExtension as CFString
+		guard let extUTI = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, fileExtension, nil)?.takeUnretainedValue() else {
+			return ""
+		}
+		guard let mimeUTI = UTTypeCopyPreferredTagWithClass(extUTI, kUTTagClassMIMEType) else {
+			return ""
+		}
+		return mimeUTI.takeRetainedValue() as String
+	}
+
+	public func getSizeFromUrl(_ url: URL) throws -> Int {
+		let values = try url.resourceValues(forKeys: [.fileSizeKey])
+		return values.fileSize ?? 0
+	}
+
+	public func getVideoDuration(_ url: URL) -> Int {
+		let asset = AVAsset(url: url)
+		let duration = asset.duration
+		let durationTime = CMTimeGetSeconds(duration)
+		return Int(round(durationTime))
+	}
+
+	public func getImageDimensions(_ url: URL) -> (Int?, Int?) {
+		if let imageSource = CGImageSourceCreateWithURL(url as CFURL, nil) {
+			if let imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, nil) as Dictionary? {
+				return getHeightAndWidthFromImageProperties(imageProperties)
+			}
+		}
+		return (nil, nil)
+	}
+
+	public func getVideoDimensions(_ url: URL) -> (Int?, Int?) {
+		guard let track = AVURLAsset(url: url).tracks(withMediaType: AVMediaType.video).first else { return (nil, nil) }
+		let size = track.naturalSize.applying(track.preferredTransform)
+		let height = abs(Int(size.height))
+		let width = abs(Int(size.width))
+		return (height, width)
+	}
+
+	private func getHeightAndWidthFromImageProperties(_ properties: [NSObject: AnyObject]) -> (Int?, Int?) {
+		let width = properties[kCGImagePropertyPixelWidth] as? Int
+		let height = properties[kCGImagePropertyPixelHeight] as? Int
+		let orientation = properties[kCGImagePropertyOrientation] as? Int ?? UIImage.Orientation.up.rawValue
+		switch orientation {
+		case UIImage.Orientation.left.rawValue, UIImage.Orientation.right.rawValue, UIImage.Orientation.leftMirrored.rawValue, UIImage.Orientation.rightMirrored.rawValue:
+			return (width, height)
+		default:
+			return (height, width)
+		}
+	}
+
+	private func getFileUrlByPath(_ path: String) -> URL? {
+		guard let url = URL.init(string: path) else {
+			return nil
+		}
+		if FileManager.default.fileExists(atPath: url.path) {
+			return url
+		} else {
+			return nil
+		}
+	}
+    
+	/// ## In which cases do we need to save a copy of a file selected by a user to the app sandbox?
+	/// In short, only when the file is **not** selected using UIDocumentPickerDelegate.
+	/// For the rest of the cases, we need to write a copy of the file to the app sandbox. 
+	/// 
+	/// For PHPicker (used for photos and videos), `NSItemProvider.loadFileRepresentation` returns a temporary file URL that is deleted after the completion handler.
+	/// The recommendation is to [Persist](https://developer.apple.com/documentation/foundation/nsitemprovider/2888338-loadfilerepresentation) the file by moving/copying
+	/// it to your app’s directory within the completion handler.
+	/// 
+	/// If available, `loadInPlaceFileRepresentation` can open a file in place; Photos assets typically do not support true in-place access,
+	/// so fall back to persisting a local file.
+	/// Ref: https://developer.apple.com/documentation/foundation/nsitemprovider/2888335-loadinplacefilerepresentation
+	/// 
+	/// For UIDocumentPicker, prefer "open in place" and avoid copying when possible.
+	/// Ref: https://developer.apple.com/documentation/uikit/uidocumentpickerviewcontroller
+	private func saveTemporaryFile(_ sourceUrl: URL) throws -> URL {
+
+		var directory = URL(fileURLWithPath: NSTemporaryDirectory())
+		if let cachesDirectory = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask).first {
+			directory = cachesDirectory
+		}
+		
+		let targetUrl = directory.appendingPathComponent(sourceUrl.lastPathComponent)
+		do {
+			try deleteFile(targetUrl)
+		}
+
+		try FileManager.default.copyItem(at: sourceUrl, to: targetUrl)
+		return targetUrl
+	}
+
+	private func deleteFile(_ url: URL) throws {
+		if FileManager.default.fileExists(atPath: url.path) {
+			try FileManager.default.removeItem(atPath: url.path)
+		}
+	}
+}
+
+extension FilePickerController: UIDocumentPickerDelegate {
+	public func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
+		do {
+			self.plugin.onFilePickerEvent(.selected(urls))
+		} catch {
+			self.plugin.onFilePickerEvent(.error("Failed to create a temporary copy of the file"))
+		}
+	}
+
+	public func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
+		self.plugin.onFilePickerEvent(.cancelled)
+	}
+}
+
+extension FilePickerController: UIImagePickerControllerDelegate, UINavigationControllerDelegate, UIPopoverPresentationControllerDelegate {
+	public func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
+		dismissViewController(picker)
+		self.plugin.onFilePickerEvent(.cancelled)
+	}
+
+	public func popoverPresentationControllerDidDismissPopover(_ popoverPresentationController: UIPopoverPresentationController) {
+		self.plugin.onFilePickerEvent(.cancelled)
+	}
+
+	public func presentationControllerDidDismiss(_ presentationController: UIPresentationController) {
+		self.plugin.onFilePickerEvent(.cancelled)
+	}
+
+	public func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) {
+		dismissViewController(picker) {
+			if let url = info[.mediaURL] as? URL {
+				do {
+					let temporaryUrl = try self.saveTemporaryFile(url)
+					self.plugin.onFilePickerEvent(.selected([temporaryUrl]))
+				} catch {
+					self.plugin.onFilePickerEvent(.error("Failed to create a temporary copy of the file"))
+				}
+			} else {
+				self.plugin.onFilePickerEvent(.cancelled)
+			}
+		}
+	}
+}
+
+@available(iOS 14, *)
+extension FilePickerController: PHPickerViewControllerDelegate {
+	public func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
+		dismissViewController(picker)
+		if results.first == nil {
+			self.plugin.onFilePickerEvent(.cancelled)
+			return
+		}
+		var temporaryUrls: [URL] = []
+		var errorMessage: String?
+		let dispatchGroup = DispatchGroup()
+		for result in results {
+			if errorMessage != nil {
+				break
+			}
+			if result.itemProvider.hasItemConformingToTypeIdentifier(UTType.movie.identifier) {
+				dispatchGroup.enter()
+				result.itemProvider.loadFileRepresentation(forTypeIdentifier: UTType.movie.identifier, completionHandler: { url, error in
+					defer {
+						dispatchGroup.leave()
+					}
+					if let error = error {
+						errorMessage = error.localizedDescription
+						return
+					}
+					guard let url = url else {
+						errorMessage = "Unknown error"
+						return
+					}
+					do {
+						// We have to make a copy of the file to the app sandbox here, as PHPicker returns an NSItemProvider with either an ephemeral file URL or content that is deleted after the completion handler.
+						// This is a different behavior from UIDocumentPicker, where the file can either be copied to the app sandbox or opened in place, and then accessed with `startAccessingSecurityScopedResource`.
+						let temporaryUrl = try self.saveTemporaryFile(url)
+						temporaryUrls.append(temporaryUrl)
+					} catch {
+						errorMessage = "Failed to create a temporary copy of the file"
+					}
+				})
+			} else if result.itemProvider.hasItemConformingToTypeIdentifier(UTType.image.identifier) {
+				dispatchGroup.enter()
+				result.itemProvider.loadFileRepresentation(forTypeIdentifier: UTType.image.identifier, completionHandler: { url, error in
+					defer {
+						dispatchGroup.leave()
+					}
+					if let error = error {
+						errorMessage = error.localizedDescription
+						return
+					}
+					guard let url = url else {
+						errorMessage = "Unknown error"
+						return
+					}
+					do {
+						// We have to make a copy of the file to the app sandbox here, as PHPicker returns an NSItemProvider with either an ephemeral file URL or content that is deleted after the completion handler.
+						// This is a different behavior from UIDocumentPicker, where the file can either be copied to the app sandbox or opened in place, and then accessed with `startAccessingSecurityScopedResource`.
+						let temporaryUrl = try self.saveTemporaryFile(url)
+						temporaryUrls.append(temporaryUrl)
+					} catch {
+						errorMessage = "Failed to create a temporary copy of the file"
+					}
+				})
+			} else {
+				errorMessage = "Unsupported file type identifier"
+			}
+		}
+		dispatchGroup.notify(queue: .main) {
+			if let errorMessage = errorMessage {
+				self.plugin.onFilePickerEvent(.error(errorMessage))
+				return
+			}
+			self.plugin.onFilePickerEvent(.selected(temporaryUrls))
+		}
+	}
+}