How to Logout from Spring Security - JWT
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🤔 When using Spring Security with JWT token, there is no implicit implementation for logout. It's up to the developer to implement the logout functionality, which involves invalidating the JWT token and clearing the authentication information from the Spring Security context.
💡 One recommended way to implement the logout functionality is to use a custom logout handler that invalidates the JWT token and clears the authentication information. This custom logout handler can then be registered with the LogoutConfigurer in your Spring Security configuration, along with any other handlers you want to execute as part of the logout process.
👨💻 It's important to ensure that the custom logout handler is executed after the JWT filter in the filter chain. This can be achieved by chaining the logout handlers in the desired order using the addLogoutHandler and logoutSuccessHandler methods of the LogoutConfigurer.
👉 In summary, while Spring Security does not provide an implicit implementation for logout when using JWT tokens, it is possible to implement a custom logout handler that invalidates the token and clears the authentication information, and register it with the LogoutConfigurer in the Spring Security configuration.
🚀 With a custom logout handler, you can take control of the logout process in your Spring Security application and ensure that the JWT token is properly invalidated and the user's authentication information is cleared. So if you're using JWT tokens with Spring Security, consider implementing a custom logout handler for a smoother user experience!
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Table of content
00:00 Intro
01:56 Does Spring provide logout mechanism?
03:56 Logout mechanism idea
06:49 Extending the class diagram
08:39 Create the Token entity
13:25 Create the Token repository
17:23 Save the generated token
21:42 Testing the changes
24:53 Revoke all user tokens
27:49 Test the changes
29:03 Update the JwtAuthentication Filter
35:24 Test the changes
37:17 Let's implement the logout
38:07 Add the security configuration
41:57 Create the Logout handler service
43:44 implement the logout handler service
47:04 Test the logout mechanism
49:28 Outro
