S3Proxy
=======
S3Proxy allows applications using the
[S3 API](https://en.wikipedia.org/wiki/Amazon_S3#S3_API_and_competing_services)
to access other object stores,
e.g., EMC Atmos, Google Cloud Storage, Microsoft Azure, OpenStack Swift.
It also allows local testing of S3 without the cost or latency associated with
using AWS.
Finally users can extend S3Proxy with custom middlewares, e.g., caching,
encryption, tiering.

Features
--------
* create, remove, and list buckets (including user-specified regions)
* put, get, delete, and list objects
* multi-part uploads (emulated operation, see [#2](https://github.com/andrewgaul/s3proxy/issues/2))
* copy objects (emulated operation, see [#46](https://github.com/andrewgaul/s3proxy/issues/46))
* delete multiple objects
* store and retrieve object metadata, including user metadata
* set and get canned bucket and object ACLs (private and public-read only)
* authorization via AWS signature v2 (including pre-signed URLs) or anonymous access
* listen on HTTP or HTTPS

Supported object stores:

* atmos
* aws-s3
* azureblob
* filesystem (on-disk storage)
* google-cloud-storage
* hpcloud-objectstorage
* openstack-swift
* rackspace-cloudfiles-uk and rackspace-cloudfiles-us
* s3
* swift and swift-keystone (legacy)
* transient (in-memory storage)

Installation
------------
Users can [download releases](https://github.com/andrewgaul/s3proxy/releases)
from GitHub.  One can also build the project by running `mvn package` which
produces a binary at `target/s3proxy`.  S3Proxy requires Java 7 to run.

Examples
--------
Linux and Mac OS X users can run S3Proxy via the executable jar:

```
chmod +x s3proxy
s3proxy --properties s3proxy.conf
```

Windows users must explicitly invoke java:

```
java -jar s3proxy --properties s3proxy.conf
```

Users can configure S3Proxy via a properties file.  An example using Rackspace
CloudFiles (based on OpenStack Swift) as the backing store:

```
s3proxy.endpoint=http://127.0.0.1:8080
s3proxy.authorization=aws-v2
s3proxy.identity=local-identity
s3proxy.credential=local-credential
jclouds.provider=rackspace-cloudfiles-us
jclouds.identity=remote-identity
jclouds.credential=remote-credential
```

Another example using the local file system as the backing store with anonymous
access:

```
s3proxy.authorization=none
s3proxy.endpoint=http://127.0.0.1:8080
jclouds.provider=filesystem
jclouds.identity=identity
jclouds.credential=credential
jclouds.filesystem.basedir=/tmp
```

S3Proxy can listen on HTTPS by setting the endpoint and
[configuring a keystore](http://wiki.eclipse.org/Jetty/Howto/Configure_SSL#Generating_Keys_and_Certificates_with_JDK_keytool).
An example:

```
s3proxy.endpoint=https://127.0.0.1:8080
s3proxy.keystore-path=keystore.jks
s3proxy.keystore-password=password
```

To setup the keystore, do

```
$ keytool -keystore keystore.jks -alias aws -genkey -keyalg RSA
```

Use `*.s3.amazonaws.com` as the `CN` if you wish to proxy
access to Amazon S3 itself. Applications will reject the self-signed
certificate, unless you import it to the application's trusted
store. If the application is written in Java, you can do:

```
$ keytool -exportcert -keystore keystore.jks -alias aws -rfc > aws.crt
$ keytool -keystore $JAVA_HOME/jre/lib/security/cacerts -import -alias aws -file aws.crt -trustcacerts
```

Users can also set other Java,
[jclouds](https://github.com/jclouds/jclouds/blob/master/core/src/main/java/org/jclouds/Constants.java),
and [S3Proxy](https://github.com/andrewgaul/s3proxy/blob/master/src/main/java/org/gaul/s3proxy/S3ProxyConstants.java)
properties.

Limitations
-----------
S3Proxy does not support:

* POST uploads
* object metadata with filesystem provider on Mac OS X ([OpenJDK issue](https://bugs.openjdk.java.net/browse/JDK-8030048))
* object server-side encryption
* object versioning
* XML ACLs

References
----------
Apache [jclouds](http://jclouds.apache.org/) provides object store support for
S3Proxy.
Ceph [s3-tests](https://github.com/ceph/s3-tests) help maintain and improve
compatibility with the S3 API.
[fake-s3](https://github.com/jubos/fake-s3) provides functionality similar to
S3Proxy when using the filesystem provider.
Another project named [s3proxy](https://github.com/abustany/s3proxy) provides
HTTP access to non-S3-aware applications.

License
-------
Copyright (C) 2014-2015 Andrew Gaul

Licensed under the Apache License, Version 2.0