Add permissions.ts utility file

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

src/contexts/settings.tsx

@@ -13,10 +13,13 @@ import { AndroidScoped, FileSystem } from 'react-native-file-access';
 import {
   getPersistedUriPermissions,
   openDocumentTree,
-  releasePersistableUriPermission,
   createFile,
   deleteFile,
 } from 'react-native-scoped-storage';
+import {
+  clearPermissions,
+  isPermissionForPath,
+} from '../utilities/permissions';
 
 interface SettingsContextType {
   settings: Settings;
@@ -37,13 +40,7 @@ function SettingsProvider({ children }: { children: ReactNode }) {
   const updateSettings = (newSettings: Partial<Settings>) => {
     const updatedSettings = { ...settings, ...newSettings };
 
-    void getPersistedUriPermissions().then(permissions => {
-      permissions.forEach(permission => {
-        if (!updatedSettings.storageUri.startsWith(permission + '/')) {
-          void releasePersistableUriPermission(permission);
-        }
-      });
-    });
+    void clearPermissions([updatedSettings.storageUri]);
 
     void AsyncStorage.setItem('storageUri', updatedSettings.storageUri);
 
@@ -78,7 +75,7 @@ function SettingsProvider({ children }: { children: ReactNode }) {
         const permissions = await getPersistedUriPermissions();
         if (
           !permissions.some(permission =>
-            storageUri.startsWith(permission + '/'),
+            isPermissionForPath(permission, storageUri),
           )
         ) {
           storageUri = '';

src/utilities/index.ts

@@ -0,0 +1 @@
+export { isPermissionForPath, clearPermissions } from './permissions';

src/utilities/permissions.ts

@@ -0,0 +1,19 @@
+import {
+  getPersistedUriPermissions,
+  releasePersistableUriPermission,
+} from 'react-native-scoped-storage';
+
+const isPermissionForPath = (permission: string, path: string) => {
+  return path.startsWith(permission + '/');
+};
+
+const clearPermissions = async (excepts: string[] = []) => {
+  const permissions = await getPersistedUriPermissions();
+  permissions.forEach(permission => {
+    if (!excepts.some(except => isPermissionForPath(permission, except))) {
+      void releasePersistableUriPermission(permission);
+    }
+  });
+};
+
+export { isPermissionForPath, clearPermissions };