Close scan activity if camera permission is denied

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

app/src/main/java/com/nextcloud/client/documentscan/DocumentScanActivity.kt

@@ -152,7 +152,7 @@ class DocumentScanActivity : ToolbarActivity(), Injectable {
                     }
                 }
             }
-            DocumentScanViewModel.UIState.DoneState -> {
+            DocumentScanViewModel.UIState.DoneState, DocumentScanViewModel.UIState.CanceledState -> {
                 finish()
             }
         }

app/src/main/java/com/nextcloud/client/documentscan/DocumentScanViewModel.kt

@@ -72,6 +72,7 @@ class DocumentScanViewModel @Inject constructor(
         ) : BaseState(pageList)
 
         object DoneState : UIState
+        object CanceledState : UIState
     }
 
     private var uploadFolder: String? = null
@@ -95,14 +96,14 @@ class DocumentScanViewModel @Inject constructor(
                 val pageList = state.pageList.toMutableList()
                 pageList.add(newPath)
                 _uiState.postValue(UIState.NormalState(pageList))
+            } else {
+                // result == null means cancellation or error
+                if (state.isEmpty) {
+                    // close only if no pages have been added yet
+                    _uiState.postValue(UIState.CanceledState)
+                }
             }
         }
-
-        if (result != null) {
-            val pageList = (uiState.value as UIState.NormalState).pageList.toMutableList()
-            pageList.add(result)
-            _uiState.value = UIState.NormalState(pageList)
-        }
     }
 
     // TODO extract to usecase

appscan/src/main/java/com/nextcloud/appscan/AppScanActivity.kt

@@ -24,6 +24,7 @@ package com.nextcloud.appscan
 
 import android.app.Activity
 import android.content.Intent
+import android.content.pm.PackageManager
 import android.os.Bundle
 import com.zynksoftware.documentscanner.ScanActivity
 import com.zynksoftware.documentscanner.model.DocumentScannerErrorModel
@@ -40,6 +41,7 @@ class AppScanActivity : ScanActivity() {
 
     override fun onError(error: DocumentScannerErrorModel) {
         // TODO pass this from app somehow?
+        println(error)
     }
 
     override fun onSuccess(scannerResults: ScannerResults) {
@@ -55,9 +57,19 @@ class AppScanActivity : ScanActivity() {
     }
 
     override fun onClose() {
+        setResult(Activity.RESULT_CANCELED)
         finish()
     }
 
+    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
+        if (permissions.contains(android.Manifest.permission.CAMERA) &&
+            (grantResults.isEmpty() || grantResults[0] == PackageManager.PERMISSION_DENIED)
+        ) {
+            onClose()
+        }
+    }
+
     companion object {
         @JvmStatic
         val enabled: Boolean = true