# firkin v0.2.3 - Table of Contents > S3-compatible object storage server as a Plug-based Elixir library. ## Pages - [Firkin](readme.md) - [Change Log](changelog.md) - [LICENSE](license.md) ## Modules - [Firkin](Firkin.md): A Plug-based library for building S3-compatible object storage APIs. - [Firkin.Auth](Firkin.Auth.md): S3 Signature Version 4 authentication. - [Firkin.Auth.SigV4](Firkin.Auth.SigV4.md): AWS Signature Version 4 implementation for server-side verification. - [Firkin.Backend](Firkin.Backend.md): Behaviour for S3 storage backends. - [Firkin.Backends.Memory](Firkin.Backends.Memory.md): Reference implementation of `Firkin.Backend` — stores credentials, buckets, objects, and multipart uploads in a named ETS table. - [Firkin.Bucket](Firkin.Bucket.md): Represents an S3 bucket in listing responses. - [Firkin.CompleteResult](Firkin.CompleteResult.md): Result of a CompleteMultipartUpload operation. - [Firkin.CopyResult](Firkin.CopyResult.md): Result of a CopyObject operation. - [Firkin.Credential](Firkin.Credential.md): Represents an S3 credential pair with an opaque identity. - [Firkin.DeleteResult](Firkin.DeleteResult.md): Result of a DeleteObjects (batch delete) operation. - [Firkin.Error](Firkin.Error.md): S3 error representation. - [Firkin.GetOpts](Firkin.GetOpts.md): Options for GetObject, including range and conditional request headers. - [Firkin.ListOpts](Firkin.ListOpts.md): Options for ListObjectsV2. - [Firkin.ListResult](Firkin.ListResult.md): Result of a ListObjectsV2 operation. - [Firkin.MultipartList](Firkin.MultipartList.md): Result of a ListMultipartUploads operation. - [Firkin.Object](Firkin.Object.md): Represents an S3 object returned by GetObject. - [Firkin.ObjectMeta](Firkin.ObjectMeta.md): Object metadata returned by HeadObject and used in ListObjectsV2 entries. - [Firkin.PartList](Firkin.PartList.md): Result of a ListParts operation. - [Firkin.Plug](Firkin.Plug.md): Plug that serves an S3-compatible HTTP API. - [Firkin.PutOpts](Firkin.PutOpts.md): Options for PutObject. - [Firkin.Telemetry](Firkin.Telemetry.md): Telemetry events emitted by Firkin. - [Firkin.XML](Firkin.XML.md): XML generation and parsing for S3 protocol messages. ## Mix Tasks - [mix firkin.serve](Mix.Tasks.Firkin.Serve.md): Starts a Bandit HTTP server serving `Firkin.Plug`, suitable for poking at Firkin with `aws` CLI, `mc`, or any other S3 client.