Public static String createJWT ( String id, String issuer, String subject, long ttlMillis ) The library also adds some nice features to the spec, such as JWT compression and claims enforcement. It is based exclusively on the JWT, JWS, JWE, JWK and JWA RFC specifications and open source under the terms of the Apache 2.0 License. Java JWT (a.k.a., JJWT) was created by Les Hazlewood (lead committer to Apache Shiro, former co-founder and CTO at Stormpath, and currently Okta’s very own Senior Architect), JJWT is a Java library that simplifies JWT creation and verification. Got it? Now you need to make a token with JJWT!įor this tutorial, we’re using an existing JWT library. The signature simply provides a secure way of verifying the contents. Check out the previously mentioned tutorial if you want.ĭon’t forget: cryptographic signatures do not provide confidentiality they are simply a way of detecting tampering with a JWT, and unless a JWT is specifically encrypted, they are publicly visible. There’s a lot of detail we’re not going to go into here regarding how tokens are encoded and how information is stored in the body. The body is the meat of the token (where the claims live). The header contains info on how the JWT is encoded. JWTs have three parts: a header, a body, and a signature. Let’s take a look at an example JWT (taken from jsonwebtoken.io) Because the JWT is passed back and forth between the client app and the server, it means that state data does not have to be stored in a database somewhere (and subsequently retrieved on every request) because of this, it scales well. JWTs are often also used to store state-dependent user data for a web session. JWTs can be used by a server to tell the client app what actions the user is allowed to execute (or what data they are allowed to access). In practice, this information is often about two things: authorization and session state. JWTs have many uses: authentication mechanism, url-safe encoding, securely sharing private data, interoperability, data expiration, etc. Often here “parties” means a client web application and a server. Tokens can be used to send arbitrary state between parties. You’re probably already pretty familiar with JSON. It’s a compact way of structuring data built upon primitive types (numbers, strings, etc…). The JSON spec, or Javascript Object Notation, defines a way of creating plain text objects using key value pairs. JSON Web Tokens are JSON objects used to send information between parties in a compact and secure manner. If you’d like to dig deeper, take a look at the JWT Spec or dive into this longer post about using JWTs for token authentication in Spring Boot apps. You’ll notice the tutorial is pretty short. This tutorial will show you how to use an existing JWT library to do two things: Java support for JWT (JSON Web Tokens) used to require a lot of work: extensive customization, hours lost resolving dependencies, and pages of code just to assemble a simple JWT.
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