Opinions will be divided as to whether that is a desirable user experience, and it’s a notoriously tricky problem (Single Sign Out: Science Direct article and Shibboleth docs). Click back on "login" though and you actually don’t need to go back through the authentication and approval cycle in the authorization server (because you haven’t logged out of that). If you click on the "logout" link you will see that the home page changes (the greeting is no longer displayed) so the user is no longer authenticated with the UI server. Spring Cloud will automatically relay the access token to our backend, and enable us to further simplify the implementation of both the UI and resource servers. We will use an OAuth2 server as the authenticator, so that we can also use it to grant tokens for the backend resource server. This is a common pattern in many applications these days, both in the enterprise and in social startups. In this section we extract the authentication responsibilities to a separate server to make our UI server the first of potentially many Single Sign On applications to the authorization server. In the last section we built a small distributed application that used Spring Session to authenticate the backend resources and Spring Cloud to implement an embedded API Gateway in the UI server.
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This is the fifth in a series of sections, and you can catch up on the basic building blocks of the application or build it from scratch by reading the first section, or you can just go straight to the source code in Github.
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Here we show how to use Spring Security OAuth together with Spring Cloud to extend our API Gateway to do Single Sign On and OAuth2 token authentication to backend resources.
In this section we continue our discussion of how to use Spring Security with Angular in a "single page application". That code is not business logic, and it isn’t making you any money, it’s just an overhead, so even worse, it costs you money. It’s not that you can’t do it without sessions, it’s just that you’d have to write all that code yourself, and what would be the point because it’s already implemented and works perfectly well on top of HttpSession (which in turn is part of the container you are using and baked into specs since the very beginning)? Even if you decide you don’t need CSRF, and have a perfectly "stateless" (non-session based) token implementation, you still had to write extra code in the client to consume and use it, where you could have just delegated to the browser and server’s own built-in features: the browser always sends cookies, and the server always has a session (unless you switch it off). Here’s a rule of thumb (attributed to Rob Winch): if your application or API is going to be accessed by a browser, you need CSRF protection. you use JWT encoded tokens), how are you going to provide CSRF protection? It’s important. It’s probably not stateless if you stored the token somewhere, but even if you didn’t (e.g. If that was your response to the last section, then read it again because maybe you didn’t get it the first time.
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