Ask user to re-grant local storage permission when revoked #251

data/src/main/java/org/cryptomator/data/cloud/local/LocalStorageAccessFrameworkImpl.kt

@@ -340,7 +340,7 @@ internal class LocalStorageAccessFrameworkImpl(context: Context, private val mim
 			file.parent.uri?.let {
 				val mimeType = if (mimeTypes.fromFilename(file.name) == null) MimeType.APPLICATION_OCTET_STREAM else mimeTypes.fromFilename(file.name)
 				try {
-					DocumentsContract.createDocument(contentResolver(), it, mimeType.toString(), file.name) // FIXME
+					DocumentsContract.createDocument(contentResolver(), it, mimeType.toString(), file.name)
 				} catch (e: FileNotFoundException) {
 					null
 				}

presentation/src/foss/java/org/cryptomator/presentation/presenter/AuthenticateCloudPresenter.kt

@@ -1,6 +1,9 @@
 package org.cryptomator.presentation.presenter
 
 import android.accounts.AccountManager
+import android.content.Intent
+import android.content.Intent.ACTION_OPEN_DOCUMENT_TREE
+import android.provider.DocumentsContract
 import android.widget.Toast
 import com.dropbox.core.android.Auth
 import org.cryptomator.data.cloud.onedrive.OnedriveClientFactory
@@ -432,6 +435,7 @@ class AuthenticateCloudPresenter @Inject constructor( //
 	private inner class LocalStorageAuthStrategy : AuthStrategy {
 
 		private var authenticationStarted = false
+
 		override fun supports(cloud: CloudModel): Boolean {
 			return cloud.cloudType() == CloudTypeModel.LOCAL
 		}
@@ -444,19 +448,43 @@ class AuthenticateCloudPresenter @Inject constructor( //
 
 		private fun startAuthentication(cloud: CloudModel) {
 			authenticationStarted = true
+
+			val uri = (cloud as LocalStorageModel).uri()
+
 			val permissions = context().contentResolver.persistedUriPermissions
 			for (permission in permissions) {
-				if (permission.uri.toString() == (cloud as LocalStorageModel).uri()) {
+				if (permission.uri.toString() == uri) {
 					succeedAuthenticationWith(cloud.toCloud())
 				}
 			}
 
-			// FIXME think about how to re-request permission
+			Timber.tag("AuthicateCloudPrester").e("Permission revoked, ask to re-pick location")
-			// FIXME change in the FOSS variant too
+
-			failAuthentication(PermissionNotGrantedException(R.string.permission_snackbar_auth_local_vault))
+			Toast.makeText(context(), getString(R.string.permission_revoked_re_request_permission), Toast.LENGTH_LONG).show()
+
+			val openDocumentTree = Intent(ACTION_OPEN_DOCUMENT_TREE).apply {
+				putExtra(DocumentsContract.EXTRA_INITIAL_URI, uri)
+			}
+
+			requestActivityResult(ActivityResultCallbacks.rePickedLocalStorageLocation(cloud), openDocumentTree)
 		}
 	}
 
+	@Callback
+	fun rePickedLocalStorageLocation(result: ActivityResult, cloud: LocalStorageModel) {
+		val rootTreeUriOfLocalStorage = result.intent().data
+		rootTreeUriOfLocalStorage?.let {
+			context() //
+				.contentResolver //
+				.takePersistableUriPermission( //
+					it,  //
+					Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION
+				)
+		}
+		Timber.tag("AuthicateCloudPrester").e("Permission granted again")
+		succeedAuthenticationWith(cloud.toCloud())
+	}
+
 	private fun encrypt(password: String): String {
 		return CredentialCryptor //
 			.getInstance(context()) //

presentation/src/main/java/org/cryptomator/presentation/presenter/CloudConnectionListPresenter.kt

@@ -289,10 +289,6 @@ class CloudConnectionListPresenter @Inject constructor( //
 		}
 	}
 
-	fun onDefaultLocalCloudConnectionClicked() {
-		finishWithResult(SELECTED_CLOUD, defaultLocalStorageCloud)
-	}
-
 	companion object {
 
 		const val SELECTED_CLOUD = "selectedCloudConnection"

presentation/src/main/res/values/strings.xml

@@ -61,6 +61,8 @@
 	<string name="permission_message_upload_file">Cryptomator needs storage access to upload files</string>
 	<string name="permission_message_share_file">Cryptomator needs storage access to share files</string>
 
+	<string name="permission_revoked_re_request_permission">Cryptomator has lost permission to access this location. Please select this folder again to restore the permission.</string>
+
 	<string name="snack_bar_action_title_settings">Settings</string>
 	<string name="snack_bar_action_title_search">Search</string>
 	<string name="snack_bar_action_title_search_previous">Previous</string>

presentation/src/notFoss/java/org/cryptomator/presentation/presenter/AuthenticateCloudPresenter.kt

@@ -2,6 +2,9 @@ package org.cryptomator.presentation.presenter
 
 import android.accounts.AccountManager
 import android.content.ActivityNotFoundException
+import android.content.Intent
+import android.content.Intent.ACTION_OPEN_DOCUMENT_TREE
+import android.provider.DocumentsContract
 import android.widget.Toast
 import com.dropbox.core.android.Auth
 import com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential
@@ -478,6 +481,7 @@ class AuthenticateCloudPresenter @Inject constructor( //
 	private inner class LocalStorageAuthStrategy : AuthStrategy {
 
 		private var authenticationStarted = false
+
 		override fun supports(cloud: CloudModel): Boolean {
 			return cloud.cloudType() == CloudTypeModel.LOCAL
 		}
@@ -490,19 +494,43 @@ class AuthenticateCloudPresenter @Inject constructor( //
 
 		private fun startAuthentication(cloud: CloudModel) {
 			authenticationStarted = true
+
+			val uri = (cloud as LocalStorageModel).uri()
+
 			val permissions = context().contentResolver.persistedUriPermissions
 			for (permission in permissions) {
-				if (permission.uri.toString() == (cloud as LocalStorageModel).uri()) {
+				if (permission.uri.toString() == uri) {
 					succeedAuthenticationWith(cloud.toCloud())
 				}
 			}
 
-			// FIXME think about how to re-request permission
+			Timber.tag("AuthicateCloudPrester").e("Permission revoked, ask to re-pick location")
-			// FIXME change in the FOSS variant too
+
-			failAuthentication(PermissionNotGrantedException(R.string.permission_snackbar_auth_local_vault))
+			Toast.makeText(context(), getString(R.string.permission_revoked_re_request_permission), Toast.LENGTH_LONG).show()
+
+			val openDocumentTree = Intent(ACTION_OPEN_DOCUMENT_TREE).apply {
+				putExtra(DocumentsContract.EXTRA_INITIAL_URI, uri)
+			}
+
+			requestActivityResult(ActivityResultCallbacks.rePickedLocalStorageLocation(cloud), openDocumentTree)
 		}
 	}
 
+	@Callback
+	fun rePickedLocalStorageLocation(result: ActivityResult, cloud: LocalStorageModel) {
+		val rootTreeUriOfLocalStorage = result.intent().data
+		rootTreeUriOfLocalStorage?.let {
+			context() //
+				.contentResolver //
+				.takePersistableUriPermission( //
+					it,  //
+					Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION
+				)
+		}
+		Timber.tag("AuthicateCloudPrester").e("Permission granted again")
+		succeedAuthenticationWith(cloud.toCloud())
+	}
+
 	private fun encrypt(password: String): String {
 		return CredentialCryptor //
 			.getInstance(context()) //