Add permission handling

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

src/contexts/settings.tsx

@@ -30,14 +30,15 @@ const SettingsProvider: React.FC<{ children: React.ReactNode }> = ({
   const updateSettings = (newSettings: Partial<Settings>) => {
     const updatedSettings = { ...settings, ...newSettings };
 
-    if (settings.storageUri !== updatedSettings.storageUri) {
-      void getPersistedUriPermissions().then(permissions => {
-        if (permissions.includes(settings.storageUri)) {
-          void releasePersistableUriPermission(settings.storageUri);
+    void getPersistedUriPermissions().then(permissions => {
+      permissions.forEach(permission => {
+        if (!updatedSettings.storageUri.startsWith(permission + '/')) {
+          void releasePersistableUriPermission(permission);
         }
       });
-      void AsyncStorage.setItem('storageUri', updatedSettings.storageUri);
-    }
+    });
+
+    void AsyncStorage.setItem('storageUri', updatedSettings.storageUri);
 
     setSettings(updatedSettings);
   };
@@ -49,12 +50,23 @@ const SettingsProvider: React.FC<{ children: React.ReactNode }> = ({
 
       if (storageUri !== '') {
         const permissions = await getPersistedUriPermissions();
-        if (!permissions.includes(storageUri)) {
+        if (
+          !permissions.some(permission => storageUri.startsWith(permission + '/'))
+        ) {
           storageUri = '';
         }
 
-        const exists = await FileSystem.exists(storageUri);
-        if (!exists) {
+        try {
+          const exists = await FileSystem.exists(storageUri);
+          if (!exists) {
+            throw new Error('Storage URI does not exist');
+          }
+
+          const isDirectory = await FileSystem.isDir(storageUri);
+          if (!isDirectory) {
+            throw new Error('Storage URI is not a directory');
+          }
+        } catch {
           storageUri = '';
         }
       }
@@ -75,7 +87,7 @@ const SettingsProvider: React.FC<{ children: React.ReactNode }> = ({
         settings.storageUri === '' ? (
           <WelcomeScreen
             selectStorageLocation={() => {
-              void openDocumentTree().then(uri => {
+              void openDocumentTree(true).then(uri => {
                 updateSettings({ storageUri: uri.uri });
               });
             }}

src/screens/settings.tsx

@@ -60,7 +60,7 @@ const SettingsScreen = () => {
               mode="elevated"
               style={styles.marginBottom}
               onPress={() => {
-                void openDocumentTree().then(uri => {
+                void openDocumentTree(true).then(uri => {
                   setSettings({ storageUri: uri.uri });
                 });
               }}>