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Tokens is a Java library for verifying and storing OAuth 2.0 service access tokens. It is resilient, configurable, and production-tested, and works with all JVM languages.

Some of the features Tokens offers:

• support for credential rotation, by reading them on-demand from the file system
• extensiblity with a credentials provider
• configuration flexibility; specify multiple tokens with different scopes
• the ability to inject fixed OAuth2 access tokens

Tokens can be useful to devs (at any company, large or small) who are working with highly-distributed microservices deployed in the cloud and need to authenticate the traffic generated when accessing APIs. For example, if your team wants to consume an API with OAuth2 credentials, Tokens will fetch the tokens for you. Then you just add scopes in the token.

When creating tokens, it's easy to make a lot of mistakes. Tokens aims to save you hassle and time.

• Java 8
• Maven
• Gradle

Add it with:

<dependency>
    <groupId>org.zalando.stups</groupId>
    <artifactId>tokens</artifactId>
    <version>see above</version>
</dependency>

compile('org.zalando.stups:tokens:${version}')

import org.zalando.stups.tokens.Tokens;
import org.zalando.stups.tokens.AccessTokens;

AccessTokens tokens = Tokens.createAccessTokensWithUri(new URI("https://example.com/access_tokens"))
                            .manageToken("exampleRW")
                                .addScope("read")
                                .addScope("write")
                                .done()
                            .manageToken("exampleRO")
                                .addScope("read")
                                .done()
                            .start();

while (true) {
    final String token = tokens.get("exampleRO");

    Request.Get("https://api.example.com")
           .addHeader("Authorization", "Bearer " + token)
           .execute():

    Thread.sleep(1000);
}

With Tokens, you can inject fixed OAuth2 access tokens via the OAUTH2_ACCESS_TOKENS environment variable and test applications locally with personal OAuth2 tokens. As an example:

$ MY_TOKEN_1=$(zign token -n mytok1)
$ MY_TOKEN_2=$(zign token -n mytok2)
$ export OAUTH2_ACCESS_TOKENS=mytok1=$MY_TOKEN_1,mytok2=$MY_TOKEN_2
$ lein repl # start my local Clojure app using the tokens library

In production on EC2 instances, Tokens fetches access tokens by requesting an authorization server with credentials, found in client.json and user.json. It's also possible to provide client.json and user.json with valid content and point this library to that directory.

This project welcomes contributions, including bug fixes and documentation enhancements. To contribute, please use the Issues Tracker to let us know what you would like to do. We'll respond, and go from there.

Copyright © 2015 Zalando SE

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.