We start by getting the principal object which contains the authenticated user. This class does everything we need so we can extend from it. within the Token. This might lead to un-authorized access to some pages even after roles have been removed in the server. It is very simple to forward this article to a wechat group with more than 100 people (QQ group does not count, nor does SongGe belong to the group leader, and the group should be Java oriented), or multiple wechat groups, as long as the cumulative number of people reaches 100, then add SongGe wechat, and Send a screenshot to SongGe to get the information. Spring Security JWT is a small utility library for encoding and decoding JSON Web Tokens. First put it on standby, and then create a hellocontroller. Spring Security is quite flexible in general. There are a couple of writeups about Spring Cloud here on the site, and a few more coming. ow we can configure JWT support using Java configuration: OAuth2 Remember Me with Refresh Token (using the Spring Security OAuth legacy stack), OAuth2 for a Spring REST API – Handle the Refresh Token in Angular, an embedded Keycloak server in a Spring Boot app. Now, let’s see how can we implement the JWT token based REST API using Java and Spring, while trying to reuse the Spring Security default behavior where we can. Firstly, the authorization field is extracted from the request header, and the corresponding value of this field is the user’s token. So let me finally show configure() method in my WebSecurityConfig: Spring Security provides a lot of flexibility by simply replacing the default classes with our own. We’ll be using the library jsonwebtoken.io for this article. Most important: the expiration date. The following code works almost the same as the previous one. So if something is wrong, username (or authToken) will be null. Generate JWT : Use /authenticate POST endpoint by using username and password to generate a JSON Web Token (JWT). The first one is an authentication filter, and the second one is an authorization filter. In the above filter, We’re first parsing the JWT retrieved from the Authorization header of the request and obtaining the user’s Id. If you recognized the last part of the string as an encoded string, you are on the right track. // Allow subclasses to set the "details" property, Spring Security: Intro with basic form login. I actually added one more thing, which is the JdbcTemplate that I used to select the roles from the database. Caused by: java.io.FileNotFoundException: class path resource [mytest.jks] cannot be opened because it does not exist. The “claims” are the parts of the payload. Let's now create a custom authentication provider by implementing the AuthneticationProvider interface.. We're going to implement the authenticate method – which attempts the authentication. For this, we need to add a couple of configurations to our realm definition file, baeldung-realm.json: For a standalone Keycloak setup, this can also be done using the Admin console. It looks like: As you can see, this method does all kinds of tasks for us. Sandro. Instead of sending HTML forms to the webserver it is more efficient and secure to just send the authentication information in the header of an HTML request and the server does the rest.

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