Securing Your App in 5 Steps: A Beginner's Guide to OAuth Tokens

When it comes to generating OAuth tokens, passwords are not exchanged between services. Instead, tokens serve as the authentication mechanism. In this article, we'll establish a basic authorization server that generates tokens based on the provided username and password.

To begin, let's create a new class that extends AuthorizationServerConfigurerAdapter. We can annotate it with @Configuration to indicate that it's a configuration class containing one or more @Bean methods. To enable the authorization server, we'll utilize @EnableAuthorizationServer.java@Configuration@EnableAuthorizationServerpublic class AuthServer extends AuthorizationServerConfigurerAdapter

Next, we'll create a bean for the password encoder. We can leverage the BcryptPasswordEncoder for encoding passwords.

java
@Beanpublic PasswordEncoder passwordEncoder() {
return new BCryptPasswordEncoder();
}

We'll override the configure methods as follows. There are three configure methods. We'll implement them as below. Here, we can configure grant types, passwords, refresh token validity, access token validity, and scopes.

java
@Overridepublic void configure(ClientDetailsServiceConfigurer clients) throws Exception {
clients.inMemory().withClient("client")
.secret(passwordEncoder.encode(("secret")))
.authorizedGrantTypes("password")
.scopes("webclient","mobileclient");
}

Grant Types:

• Authorization code grant
• Implicit grant
• Resource owner credentials grant
• Client credentials grant
• Refresh token grant

Scope

Scopes impose limitations on an application's access to user's accounts. It can encompass one or more scopes. For a more in-depth guide on securing your app with OAuth tokens, check out this article: https://t8tech.com/it/coding/secure-your-app-in-5-steps-a-beginners-guide-to-oauth-tokens/

@Overridepublic void define(AuthorizationServerEndpointsConfigurator endpoints) throws Exception {
    endpoints.setAuthenticationManager(this.authenticationManagerBean);
}