# File Store

## Description

File stores register through `IFlexFileStore` (and optional `IFlexFileStoreWithUrls` / `IFlexFileStoreWithDirectories`). Your application code stays provider-agnostic while AWS S3, Azure Blob, and GCP Cloud Storage handle object storage.

## Configuration in DI

Register only the provider.

```csharp
// Pick ONE
services.AddFlexAwsS3FileStore(configuration);
// services.AddFlexAzureBlobFileStore(configuration);
// services.AddFlexGcpCloudStorageFileStore(configuration);
```

## appsettings.json

File store configuration is read from `FlexBase:DataStores:File:<Provider>`.

```json
{
  "FlexBase": {
    "DataStores": {
      "File": {
        "AwsS3": {
          "AccessKeyId": "<store-in-secrets>",
          "SecretAccessKey": "<store-in-secrets>",
          "Region": "us-east-1"
        }
      }
    }
  }
}
```

## Sample usage ({YourApplication})

```csharp
public class BackupUploader
{
	private readonly IFlexFileStore _fileStore;

	public BackupUploader(IFlexFileStore fileStore)
		=> _fileStore = fileStore;

	public Task UploadAsync(Stream payload, CancellationToken ct = default)
		=> _fileStore.WriteAsync(
			container: "backups",
			path: "daily/backup.zip",
			content: payload,
			contentType: "application/zip",
			ct: ct);
}
```

## Provider pages

* AWS S3: `file-store/aws-s3.md`
* Azure Blob: `file-store/azure-blob.md`
* GCP Cloud Storage: `file-store/gcp-cloud-storage.md`

## Provider considerations

* Treat `container` as bucket/container/root folder, and `path` as a forward-slash key.
* Keep credentials in secrets.


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