List file properties
You can list files without having to download all the files. You can do this by using the list API from the Amplify Library for Storage.
List Files
This will list all files located under path album that:
- have
privateaccess level - are in the root of
album/(the result doesn't include files under any sub path)
Future<void> listAlbum() async { try { String? nextToken; bool hasNextPage; do { final result = await Amplify.Storage.list( path: const StoragePath.fromString('public/album/'), options: StorageListOptions( pageSize: 50, nextToken: nextToken, pluginOptions: const S3ListPluginOptions( excludeSubPaths: true, ), ), ).result; safePrint('Listed items: ${result.items}'); nextToken = result.nextToken; hasNextPage = result.hasNextPage; } while (hasNextPage); } on StorageException catch (e) { safePrint(e.message); }}Pagination is enabled by default. The default pageSize is 1000 if it is not set in the StorageListOptions.
List all files without pagination
You can also list all files under a given path without pagination by using the pluginOptions and S3ListPluginOptions.listAll() constructor.
This will list all public files (i.e. those with guest access level):
Future<void> listAllUnderPublicPath() async { try { final result = await Amplify.Storage.list( path: const StoragePath.fromString('public/'), options: const StorageListOptions( pluginOptions: S3ListPluginOptions.listAll(), ), ).result; safePrint('Listed items: ${result.items}'); } on StorageException catch (e) { safePrint(e.message); }}More list options
| Option | Type | Description |
|---|---|---|
| excludeSubPaths | boolean | Whether to exclude objects under the sub paths of the path to list. Defaults to false. |
| delimiter | String | The delimiter to use when evaluating sub paths. If excludeSubPaths is false, this value has no impact on behavior. |
Get File Properties
You can also view properties of an individual file.
Future<void> getFileProperties() async { try { final result = await Amplify.Storage.getProperties( path: const StoragePath.fromString('example.txt'), ).result; safePrint('File size: ${result.storageItem.size}'); } on StorageException catch (e) { safePrint(e.message); }}