Cancel ongoing uploading operations after cancelling post

1] Cancel ongoing uploading operations after the user has pressed "cancel post"
2] Don't generate haptic feedback in this error case because user has already dismissed the Post View

Changelog-Fixed: Cancel ongoing uploading operations after the user cancels the post
Signed-off-by: Swift Coder <scoder1747@gmail.com>

damus/Models/ImageUploadModel.swift

@@ -97,10 +97,17 @@ class ImageUploadModel: NSObject, URLSessionTaskDelegate, ObservableObject, Imag
                 self.progress = nil
                 UINotificationFeedbackGenerator().notificationOccurred(.success)
             }
-        case .failed(_):
+        case .failed(let error):
             DispatchQueue.main.async {
                 self.progress = nil
-                UINotificationFeedbackGenerator().notificationOccurred(.error)
+                if let nsError = error as NSError?,
+                   nsError.domain == NSURLErrorDomain,
+                   nsError.code == NSURLErrorCancelled {
+                    print("Upload forced cancelled by user after Cancelling the Post, no feedback triggered.")
+                } else {
+                    // Trigger feedback for all other errors
+                    UINotificationFeedbackGenerator().notificationOccurred(.error)
+                }
             }
         }
 

damus/Views/PostView.swift

@@ -73,6 +73,7 @@ struct PostView: View {
     @StateObject var tagModel: TagModel = TagModel()
 
     @State private var current_placeholder_index = 0
+    @State private var uploadTasks: [Task<Void, Never>] = []
 
     let action: PostAction
     let damus_state: DamusState
@@ -98,9 +99,15 @@ struct PostView: View {
 
     func cancel() {
         notify(.post(.cancel))
+        cancelUploadTasks()
         dismiss()
     }
 
+    func cancelUploadTasks() {
+        uploadTasks.forEach { $0.cancel() }
+        uploadTasks.removeAll()
+    }
+
     func send_post() {
         // don't add duplicate pubkeys but retain order
         var pkset = Set<Pubkey>()
@@ -479,14 +486,15 @@ struct PostView: View {
                 }
                 .alert(NSLocalizedString("Are you sure you want to upload the selected media?", comment: "Alert message asking if the user wants to upload media."), isPresented: $image_upload_confirm) {
                     Button(NSLocalizedString("Upload", comment: "Button to proceed with uploading."), role: .none) {
-                        // initiate asynchronous uploading Task for multiple-images 
-                        Task {
+                        // initiate asynchronous uploading Task for multiple-images
+                        let task = Task {
                             for media in preUploadedMedia {
                                 if let mediaToUpload = generateMediaUpload(media) {
                                     await self.handle_upload(media: mediaToUpload)
                                 }
                             }
                         }
+                        uploadTasks.append(task)
                         self.attach_media = false
                     }
                     Button(NSLocalizedString("Cancel", comment: "Button to cancel the upload."), role: .cancel) {
@@ -505,23 +513,25 @@ struct PostView: View {
                 Button(NSLocalizedString("Upload", comment: "Button to proceed with uploading."), role: .none) {
                     if let image = imagePastedFromPasteboard,
                        let mediaToUpload = generateMediaUpload(image) {
-                        Task {
-                            await self.handle_upload(media: mediaToUpload)
+                        let task = Task {
+                            _ = await self.handle_upload(media: mediaToUpload)
                         }
+                        uploadTasks.append(task)
                     }
                 }
                 Button(NSLocalizedString("Cancel", comment: "Button to cancel the upload."), role: .cancel) {}
             }
             // This alert seeks confirmation about media-upload from Damus Share Extension
             .alert(NSLocalizedString("Are you sure you want to upload the selected media?", comment: "Alert message asking if the user wants to upload media."), isPresented: $imageUploadConfirmDamusShare) {
                 Button(NSLocalizedString("Upload", comment: "Button to proceed with uploading."), role: .none) {
-                    Task {
+                    let task = Task {
                         for media in preUploadedMedia {
                             if let mediaToUpload = generateMediaUpload(media) {
                                 await self.handle_upload(media: mediaToUpload)
                             }
                         }
                     }
+                    uploadTasks.append(task)
                 }
                 Button(NSLocalizedString("Cancel", comment: "Button to cancel the upload."), role: .cancel) {}
             }