Spring Authorization Server 1.0.0: javascript error when requesting /oauth2/token

Question

I have created a Spring Authorization Server - you can find the code on github https://github.com/costerutilo/UTILO-Authorization-Server

I cannot read the token via JavaScript. I created a simple Vue web application to get the client authorization code, but I can't get the token.

Try using the fetch API:

const url = 'http://127.0.0.1:9000/oauth2/token';

    var credentials = btoa(import.meta.env.VITE_CLIENT_ID ':' 'secret');
    var basicAuth = 'Basic ' credentials;

    var myHeaders = new Headers();
    //myHeaders.append("Authorization", "Basic dXRpbG8tY2xpZW50OnNlY3JldA==");
    myHeaders.append("Authorization", basicAuth);
    myHeaders.append("Content-Type", "application/x-www-form-urlencoded");

    var urlencoded = new URLSearchParams();
    urlencoded.append("grant_type", "authorization_code");
    // urlencoded.append("code", "yyJTTI3JqNno1XlSW59qxX3CCytMm-ChoHnqVw3iSUGyT6ltT_tpPclQ8bdSyeApO4IWE442irBiRwntJJzae9BIntpC3_vshTgNhAfbsBlkwh3n50jkAxs3 hTqavqsy");
    urlencoded.append("code", code);
    urlencoded.append("redirect_uri", "https://www.utilo.eu");

    var requestOptions = {
      method: 'POST',
      headers: myHeaders,
      body: urlencoded,
      redirect: 'follow'
    };

    fetch(url, requestOptions)
        .then(response => response.text())
        .then(result => console.log(result))
        .catch(error => console.log('error', error));

In the browser's javascript console, I see a CORS exception

Access to fetch at 'http://127.0.0.1:9000/oauth2/token' from origin 'http://127.0.0.1:9010' has been blocked by CORS policy: Response to preflight request doesn't pass access control check

The server console gives the error:

2023-02-27T09:35:53.786 01:00 TRACE 33212 --- [nio-9000-exec-3] o.s.s.w.a.ExceptionTranslationFilter : Sending AnonymousAuthenticationToken [Principal =anonymousUser, Credentials=[PROTECTED], Authenticated=true, Details=WebAuthenticationDetails [RemoteIpAddress=127.0.0.1, SessionId=null], Granted Authorities=[ROLE_ANONYMOUS]] to authentication entry point since access is denied

org.springframework.security.access.AccessDeniedException: Access Denied

If I try the same request in Postman, I get JSON with the token.

I don't know what my reasoning error is, or what I'm doing wrong.

Answer 1

You will need to enable CORS for your Spring Security filter chain and provide a @Bean such as this example:

@Configuration
public class CorsConfig {

    @Bean
    public CorsConfigurationSource corsConfigurationSource() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        CorsConfiguration config = new CorsConfiguration();
        config.addAllowedHeader("*");
        config.addAllowedMethod("*");
        config.addAllowedOrigin("http://127.0.0.1:4200");
        config.setAllowCredentials(true);
        source.registerCorsConfiguration("/**", config);
        return source;
    }

}

Note: Port 4200 is for the Angular development environment, replace it with your Vue development server port.