Display a more specific error message when the direct upload POST request fails (#32)

Author: andrewjl-mux

Example/SwiftUploadSDKExample/SwiftUploadSDKExample/Model/UploadCreationModel.swift

@@ -11,7 +11,7 @@ import MuxUploadSDK
 
 class UploadCreationModel : ObservableObject {
 
-    struct PickerError: Error {
+    struct PickerError: Error, Equatable {
 
         static var unexpectedFormat: PickerError {
             PickerError(localizedDescription: "Unexpected video file format")
@@ -24,6 +24,10 @@ class UploadCreationModel : ObservableObject {
         static var createUploadFailed: PickerError {
             PickerError(localizedDescription: "Upload could not be created")
         }
+
+        static var assetExportSessionFailed: PickerError {
+            PickerError(localizedDescription: "Upload could not be exported")
+        }
 
         var localizedDescription: String
 
@@ -71,7 +75,7 @@ class UploadCreationModel : ObservableObject {
 
         guard let assetIdentitfier = pickerResult.assetIdentifier else {
             NSLog("!! No Asset ID for chosen asset")
-            exportState = .failure(nil)
+            exportState = .failure(UploadCreationModel.PickerError.assetExportSessionFailed)
             return
         }
         let options = PHFetchOptions()
@@ -93,7 +97,7 @@ class UploadCreationModel : ObservableObject {
             DispatchQueue.main.async {
                 guard let exportSession = exportSession else {
                     self.logger.error("!! No Export session")
-                    self.exportState = .failure(nil)
+                    self.exportState = .failure(UploadCreationModel.PickerError.assetExportSessionFailed)
                     return
                 }
                 self.exportToOutFile(session: exportSession, outFile: tempFile)
@@ -207,7 +211,7 @@ struct PreparedUpload {
 }
 
 enum ExportState {
-    case not_started, preparing, failure(UploadCreationModel.PickerError?), ready(PreparedUpload)
+    case not_started, preparing, failure(UploadCreationModel.PickerError), ready(PreparedUpload)
 }
 
 enum PhotosAuthState {

Example/SwiftUploadSDKExample/SwiftUploadSDKExample/Screens/CreateUploadView.swift

@@ -57,7 +57,8 @@ fileprivate struct ErrorView: View {
                     .foregroundColor(.red)
                     Spacer()
                         .frame(maxHeight: 12)
-                    Text("Couln't prepare the video for upload. Please try another video")
+
+                    Text(message)
                         .foregroundColor(White)
                         .multilineTextAlignment(.center)
                         .font(.system(size: 12))
@@ -80,9 +81,22 @@ fileprivate struct ErrorView: View {
     }
 
     let error: Error?
+
+    let message: String
 
     init(error: Error? = nil) {
         self.error = error
+        self.message = "Couldn't prepare the video for upload. Please try another video."
+    }
+
+    init(error: UploadCreationModel.PickerError) {
+        self.error = error
+
+        if error == UploadCreationModel.PickerError.createUploadFailed {
+            self.message = "Couldn't create direct upload. Check your access token and network connectivity."
+        } else {
+            self.message = "Couldn't prepare the video for upload. Please try another video."
+        }
     }
 }