feat(dialog) - Support fileAccessMode for open dialog (#3030) (#3136)

* feat(dialog) - Support fileAccessMode for open dialog (#3030)

On iOS, when trying to access a file that exists outside of the app sandbox, one of 2 things need to happen to be able to perform any operations on said file:

* A copy of the file needs to be made to the internal app sandbox
* The method startAccessingSecurityScopedResource needs to be called.

Previously, a copy of the file was always being made when a file was selected through the picker dialog.

While this did ensure there were no file access exceptions when reading from the file, it does not scale well for large files.

To resolve this, we now support `fileAccessMode`, which allows a file handle to be returned without copying the file to the app sandbox.

This MR only supports this change for iOS; MacOS has a different set of needs for security scoped resources.

See discussion in #3716 for more discussion of the difference between iOS and MacOS.
See MR #3185 to see how these scoped files will be accessible using security scoping.

* fmt, clippy

* use enum

---------

Co-authored-by: Lucas Nogueira <lucas@tauri.app>

plugins/dialog/ios/Sources/DialogPlugin.swift

@@ -34,6 +34,7 @@ struct FilePickerOptions: Decodable {
   var filters: [Filter]?
   var defaultPath: String?
   var pickerMode: PickerMode?
+  var fileAccessMode: FileAccessMode?
 }
 
 struct SaveFileDialogOptions: Decodable {
@@ -41,6 +42,11 @@ struct SaveFileDialogOptions: Decodable {
   var defaultPath: String?
 }
 
+enum FileAccessMode: String, Decodable {
+  case copy
+  case scoped
+}
+
 enum PickerMode: String, Decodable {
   case document
   case media
@@ -56,6 +62,7 @@ class DialogPlugin: Plugin {
   override init() {
     super.init()
     filePickerController = FilePickerController(self)
+
   }
 
   @objc public func showFilePicker(_ invoke: Invoke) throws {
@@ -70,12 +77,13 @@ class DialogPlugin: Plugin {
       case .error(let error):
         invoke.reject(error)
       }
-      }
+    }
 
     if #available(iOS 14, *) {
       let parsedTypes = parseFiltersOption(args.filters ?? [])
 
-      let mimeKinds = Set(parsedTypes.compactMap { $0.preferredMIMEType?.components(separatedBy: "/")[0] })
+      let mimeKinds = Set(
+        parsedTypes.compactMap { $0.preferredMIMEType?.components(separatedBy: "/")[0] })
       let filtersIncludeImage = mimeKinds.contains("image")
       let filtersIncludeVideo = mimeKinds.contains("video")
       let filtersIncludeNonMedia = mimeKinds.contains(where: { $0 != "image" && $0 != "video" })
@@ -85,7 +93,8 @@ class DialogPlugin: Plugin {
       if args.pickerMode == .media
         || args.pickerMode == .image
         || args.pickerMode == .video
-        || (!filtersIncludeNonMedia && (filtersIncludeImage || filtersIncludeVideo)) {
+        || (!filtersIncludeNonMedia && (filtersIncludeImage || filtersIncludeVideo))
+      {
         DispatchQueue.main.async {
           var configuration = PHPickerConfiguration(photoLibrary: PHPhotoLibrary.shared())
           configuration.selectionLimit = (args.multiple ?? false) ? 0 : 1
@@ -107,8 +116,10 @@ class DialogPlugin: Plugin {
         DispatchQueue.main.async {
           // The UTType.item is the catch-all, allowing for any file type to be selected.
           let contentTypes = parsedTypes.isEmpty ? [UTType.item] : parsedTypes
-          let picker: UIDocumentPickerViewController = UIDocumentPickerViewController(forOpeningContentTypes: contentTypes, asCopy: true)
-          
+          let picker: UIDocumentPickerViewController = UIDocumentPickerViewController(
+            forOpeningContentTypes: contentTypes,
+            asCopy: args.fileAccessMode == .scoped ? false : true)
+
           if let defaultPath = args.defaultPath {
             picker.directoryURL = URL(string: defaultPath)
           }
@@ -181,7 +192,7 @@ class DialogPlugin: Plugin {
         }
       }
     }
-    
+
     return parsedTypes
   }
 
@@ -203,14 +214,14 @@ class DialogPlugin: Plugin {
     if !filtersIncludeNonMedia && (filtersIncludeImage || filtersIncludeVideo) {
       DispatchQueue.main.async {
         let picker = UIImagePickerController()
-          picker.delegate = self.filePickerController
+        picker.delegate = self.filePickerController
 
-          if filtersIncludeImage && !filtersIncludeVideo {
-            picker.sourceType = .photoLibrary
-          }
+        if filtersIncludeImage && !filtersIncludeVideo {
+          picker.sourceType = .photoLibrary
+        }
 
-          picker.modalPresentationStyle = .fullScreen
-          self.presentViewController(picker)
+        picker.modalPresentationStyle = .fullScreen
+        self.presentViewController(picker)
       }
     } else {
       let documentTypes = parsedTypes.isEmpty ? ["public.data"] : parsedTypes
@@ -234,7 +245,8 @@ class DialogPlugin: Plugin {
     for filter in filters {
       for ext in filter.extensions ?? [] {
         guard
-          let utType: String = UTTypeCreatePreferredIdentifierForTag(kUTTagClassMIMEType, ext as CFString, nil)?.takeRetainedValue() as String?
+          let utType: String = UTTypeCreatePreferredIdentifierForTag(
+            kUTTagClassMIMEType, ext as CFString, nil)?.takeRetainedValue() as String?
         else {
           continue
         }
@@ -292,6 +304,7 @@ class DialogPlugin: Plugin {
       manager.viewController?.present(alert, animated: true, completion: nil)
     }
   }
+
 }
 
 @_cdecl("init_plugin_dialog")