npm package: @flystorage/file-storage
Description: File-storage abstraction: multiple filesystems, one API.
Author: Frank de Jonge
Latest version: 1.2.2

<img src="https://raw.githubusercontent.com/duna-oss/flystorage/main/flystorage.svg" width="50px" height="50px" />

# Flystorage
Flystorage is a file storage abstraction for NodeJS and TypeScript. It is an 80/20 solution
that is built around a set of goals:

- Provide a straight-forward API that is easy to use.
- Allow application code to be unaware WHERE files are stored.
- Pragmatically smooth over underlying storage differences.
- Expose an async/await based API, promises all the way.
- Abstract over file permissions using "visibility".
- Actually tested using real integrations, _mocks are not welcome_.
- Stand on the shoulders of giants, use official vendor packages when possible.

### What is Flystorage NOT:
Flystorage is meant to be used in cases for generic file storage use-cases. It's not an API for
any  specific filesystem. It's a generalised solution and will not implement feature only
specific to one particular storage implementation. There will be use-cases that are not catered
to, simply because they cannot be abstracted over in a reasonable manner.

## Capabilities

- Write files using string | buffer | readable/stream
- Read files as stream, string, or Uint8Array
- List the contents of a directory/prefix, (shallow and deep).
- Metadata, such as; mime-type, last modified timestamp, and file size.
- Expose or calculate checksums for files.
- Delete files without failing when they don't exist.
- Set permissions using abstracted visibility
- Delete directories (and any files it contains)
- Generate public URLs.
- Generate temporary (signed) URLs.
- Secure direct uploads from the browser.
- Moving files
- Copying files


## Adapters
- [Local Filesystem](https://www.npmjs.com/package/@flystorage/local-fs)
- [AWS S3 (using the V3 SDK)](https://www.npmjs.com/package/@flystorage/aws-s3)
- [Azure Blob Storage](https://www.npmjs.com/package/@flystorage/azure-storage-blob)
- [Test implementation (in-memory)](https://www.npmjs.com/package/@flystorage/in-memory)
- [Google Cloud Storage](https://www.npmjs.com/package/@flystorage/google-cloud-storage)
- [Chaos adapter decorator](https://www.npmjs.com/package/@flystorage/chaos)

## Usage
Install the main package and any adapters you might need:

```bash
npm i -S @flystorage/file-storage

# for using AWS S3
npm i -S @flystorage/aws-s3

# for using the local filesystem
npm i -S @flystorage/local-fs
```

## Local Usage
```typescript
import {resolve} from 'node:path';
import {createReadStream} from 'node:fs';
import {FileStorage, Visibility} from '@flystorage/file-storage';
import {LocalStorageAdapter} from '@flystorage/local-fs';

/**
 * SETUP
 **/

const rootDirectory = resolve(process.cwd(), 'my-files');
const storage = new FileStorage(new LocalStorageAdapter(rootDirectory));

/**
 * USAGE
 **/

// Write using a string
await storage.write('write-from-a-string.txt', 'file contents');

// Write using a stream
const stream = createReadStream(resolve(process.cwd(), 'test-files/picture.png'));
await storage.write('picture.png', stream);

// Write with visibility (permissions).
await storage.write('public.txt', 'debug', {
    visibility: Visibility.PUBLIC, // mode: 0o644
});
await storage.write('private.txt', 'debug', {
    visibility: Visibility.PRIVATE, // mode: 0o600
});

// List directory contents
const contentsAsAsyncGenerator = storage.list('', {deep: true});

for await (const item of contentsAsAsyncGenerator) {
    console.log(item.path);

    if (item.isFile) {
        // do something with the file
    } else if (item.isDirectory) {
        // do something with the directory
    }
}

// Delete a file
await storage.deleteFile('some-file.txt');

// Delete a directory (with all contents)
await storage.deleteDirectory('some-directory');
```

## Author
Flystorage is built by the maintainer of [Flysystem](https://flysystem.thephpleague.com), a
filesystem abstraction for PHP. This brings along over
a decade of filesystem abstraction experience.