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2.5. Writing the application

Start by implementing ProtectedResource: 

package org.acme.security.openid.connect.client;

import jakarta.annotation.security.RolesAllowed;
import jakarta.inject.Inject;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;

import io.quarkus.security.Authenticated;
import io.smallrye.mutiny.Uni;

import org.eclipse.microprofile.jwt.JsonWebToken;

@Path("/protected")
@Authenticated
public class ProtectedResource {

    @Inject
    JsonWebToken principal;

    @GET
    @RolesAllowed("user")
    @Produces("text/plain")
    @Path("userName")
    public Uni<String> userName() {
        return Uni.createFrom().item(principal.getName());
    }

    @GET
    @RolesAllowed("admin")
    @Produces("text/plain")
    @Path("adminName")
    public Uni<String> adminName() {
        return Uni.createFrom().item(principal.getName());
    }
}

ProtectedResource returns a name from both userName() and adminName() methods. The name is extracted from the current JsonWebToken.

Next, add the following REST clients:

  1. RestClientWithOidcClientFilter, which uses an OIDC client filter provided by the quarkus-rest-client-oidc-filter extension to get and propagate an access token.
  2. RestClientWithTokenHeaderParam, which accepts a token already acquired by the programmatically created OidcClient as an HTTP Authorization header value.
  3. RestClientWithTokenPropagationFilter, which uses an OIDC token propagation filter provided by the quarkus-rest-client-oidc-token-propagation extension to get and propagate an access token.

Add the RestClientWithOidcClientFilter REST client: 

package org.acme.security.openid.connect.client;

import jakarta.ws.rs.GET;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;

import org.eclipse.microprofile.rest.client.inject.RegisterRestClient;

import io.quarkus.oidc.client.filter.OidcClientFilter;
import io.smallrye.mutiny.Uni;

@RegisterRestClient
@OidcClientFilter
1 

@Path("/")
public interface RestClientWithOidcClientFilter {

    @GET
    @Produces("text/plain")
    @Path("userName")
    Uni<String> getUserName();

    @GET
    @Produces("text/plain")
    @Path("adminName")
    Uni<String> getAdminName();
}
1
Register an OIDC client filter with the REST client to get and propagate the tokens.

Add the RestClientWithTokenHeaderParam REST client: 

package org.acme.security.openid.connect.client;

import org.eclipse.microprofile.rest.client.inject.RegisterRestClient;

import io.smallrye.mutiny.Uni;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.HeaderParam;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;

@RegisterRestClient
@Path("/")
public interface RestClientWithTokenHeaderParam {

    @GET
    @Produces("text/plain")
    @Path("userName")
    Uni<String> getUserName(@HeaderParam("Authorization") String authorization);
1 


    @GET
    @Produces("text/plain")
    @Path("adminName")
    Uni<String> getAdminName(@HeaderParam("Authorization") String authorization);
2 

}
1 2
RestClientWithTokenHeaderParam REST client expects that the tokens will be passed to it as HTTP Authorization header values.

Add the RestClientWithTokenPropagationFilter REST client: 

package org.acme.security.openid.connect.client;

import jakarta.ws.rs.GET;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;

import org.eclipse.microprofile.rest.client.inject.RegisterRestClient;

import io.quarkus.oidc.token.propagation.common.AccessToken;

import io.smallrye.mutiny.Uni;

@RegisterRestClient
@AccessToken
1 

@Path("/")
public interface RestClientWithTokenPropagationFilter {

    @GET
    @Produces("text/plain")
    @Path("userName")
    Uni<String> getUserName();

    @GET
    @Produces("text/plain")
    @Path("adminName")
    Uni<String> getAdminName();
}
1
Register an OIDC token propagation filter with the REST client to propagate the incoming already-existing tokens.
重要

Do not use the RestClientWithOidcClientFilter and RestClientWithTokenPropagationFilter interfaces in the same REST client because they can conflict, leading to issues. For example, the OIDC client filter can override the token from the OIDC token propagation filter, or the propagation filter might not work correctly if it attempts to propagate a token when none is available, expecting the OIDC client filter to obtain a new token instead.

Also, add OidcClientCreator to create an OIDC client programmatically at startup. OidcClientCreator supports RestClientWithTokenHeaderParam REST client calls: 

package org.acme.security.openid.connect.client;

import java.util.Map;

import org.eclipse.microprofile.config.inject.ConfigProperty;

import io.quarkus.oidc.client.OidcClient;
import io.quarkus.oidc.client.OidcClients;
import io.quarkus.oidc.client.runtime.OidcClientConfig;
import io.quarkus.oidc.client.runtime.OidcClientConfig.Grant.Type;
import io.quarkus.runtime.StartupEvent;
import io.smallrye.mutiny.Uni;
import jakarta.enterprise.context.ApplicationScoped;
import jakarta.enterprise.event.Observes;
import jakarta.inject.Inject;

@ApplicationScoped
public class OidcClientCreator {

    @Inject
    OidcClients oidcClients;
1 

    @ConfigProperty(name = "quarkus.oidc.auth-server-url")
    String oidcProviderAddress;

    private volatile OidcClient oidcClient;

    public void startup(@Observes StartupEvent event) {
    	createOidcClient().subscribe().with(client -> {oidcClient = client;});
    }

    public OidcClient getOidcClient() {
        return oidcClient;
    }

    private Uni<OidcClient> createOidcClient() {
        OidcClientConfig cfg = OidcClientConfig
            .authServerUrl(oidcProviderAddress)
            .id("myclient")
            .clientId("backend-service")
            .credentials("secret")
            .grant(Type.PASSWORD)
            .grantOptions("password", Map.of("username", "alice", "password", "alice"))
            .build();
        return oidcClients.newClient(cfg);
    }
}
1
OidcClients can be used to retrieve the already initialized, named OIDC clients and create new OIDC clients on demand.

Now, finish creating the application by adding FrontendResource: 

package org.acme.security.openid.connect.client;

import jakarta.inject.Inject;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;

import io.quarkus.oidc.client.Tokens;
import io.quarkus.oidc.client.runtime.TokensHelper;

import org.eclipse.microprofile.rest.client.inject.RestClient;

import io.smallrye.mutiny.Uni;

@Path("/frontend")
public class FrontendResource {
    @Inject
    @RestClient
    RestClientWithOidcClientFilter restClientWithOidcClientFilter;
1 


    @Inject
    @RestClient
    RestClientWithTokenPropagationFilter restClientWithTokenPropagationFilter;
2 


    @Inject
    OidcClientCreator oidcClientCreator;
    TokensHelper tokenHelper = new TokensHelper();
3 

    @Inject
    @RestClient
    RestClientWithTokenHeaderParam restClientWithTokenHeaderParam;
4 


    @GET
    @Path("user-name-with-oidc-client-token")
    @Produces("text/plain")
    public Uni<String> getUserNameWithOidcClientToken() {
5 

        return restClientWithOidcClientFilter.getUserName();
    }

    @GET
    @Path("admin-name-with-oidc-client-token")
    @Produces("text/plain")
    public Uni<String> getAdminNameWithOidcClientToken() {
6 

	return restClientWithOidcClientFilter.getAdminName();
    }

    @GET
    @Path("user-name-with-propagated-token")
    @Produces("text/plain")
    public Uni<String> getUserNameWithPropagatedToken() {
7 

        return restClientWithTokenPropagationFilter.getUserName();
    }

    @GET
    @Path("admin-name-with-propagated-token")
    @Produces("text/plain")
    public Uni<String> getAdminNameWithPropagatedToken() {
8 

        return restClientWithTokenPropagationFilter.getAdminName();
    }

    @GET
    @Path("user-name-with-oidc-client-token-header-param")
    @Produces("text/plain")
    public Uni<String> getUserNameWithOidcClientTokenHeaderParam() {
9 

    	return tokenHelper.getTokens(oidcClientCreator.getOidcClient()).onItem()
        		.transformToUni(tokens -> restClientWithTokenHeaderParam.getUserName("Bearer " + tokens.getAccessToken()));
    }

    @GET
    @Path("admin-name-with-oidc-client-token-header-param")
    @Produces("text/plain")
    public Uni<String> getAdminNameWithOidcClientTokenHeaderParam() {
10 

    	return tokenHelper.getTokens(oidcClientCreator.getOidcClient()).onItem()
        		.transformToUni(tokens -> restClientWithTokenHeaderParam.getAdminName("Bearer " + tokens.getAccessToken()));
    }

    @GET
    @Path("user-name-with-oidc-client-token-header-param-blocking")
    @Produces("text/plain")
    public String getUserNameWithOidcClientTokenHeaderParamBlocking() {
11 

    	Tokens tokens = tokenHelper.getTokens(oidcClientCreator.getOidcClient()).await().indefinitely();
        return restClientWithTokenHeaderParam.getUserName("Bearer " + tokens.getAccessToken()).await().indefinitely();
    }

    @GET
    @Path("admin-name-with-oidc-client-token-header-param-blocking")
    @Produces("text/plain")
    public String getAdminNameWithOidcClientTokenHeaderParamBlocking() {
12 

    	Tokens tokens = tokenHelper.getTokens(oidcClientCreator.getOidcClient()).await().indefinitely();
        return restClientWithTokenHeaderParam.getAdminName("Bearer " + tokens.getAccessToken()).await().indefinitely();
    }

}
1 5 6
FrontendResource uses the injected RestClientWithOidcClientFilter REST client with the OIDC client filter to get and propagate an access token to ProtectedResource when either /frontend/user-name-with-oidc-client-token or /frontend/admin-name-with-oidc-client-token is called.
2 7 8
FrontendResource uses the injected RestClientWithTokenPropagationFilter REST client with the OIDC token propagation filter to propagate the current incoming access token to ProtectedResource when either /frontend/user-name-with-propagated-token or /frontend/admin-name-with-propagated-token is called.
4 9 10
FrontendResource uses the programmatically created OIDC client to get and propagate an access token to ProtectedResource by passing it directly to the injected RestClientWithTokenHeaderParam REST client’s method as an HTTP Authorization header value, when either /frontend/user-name-with-oidc-client-token-header-param or /frontend/admin-name-with-oidc-client-token-header-param is called.
11 12
Sometimes, one may have to acquire tokens in a blocking manner before propagating them with the REST client. This example shows how to acquire the tokens in such cases.
3
io.quarkus.oidc.client.runtime.TokensHelper is a useful tool when OIDC client is used directly, without the OIDC client filter. To use TokensHelper, pass OIDC Client to it to get the tokens and TokensHelper acquires the tokens and refreshes them if necessary in a thread-safe way.

Finally, add a Jakarta REST ExceptionMapper: 

package org.acme.security.openid.connect.client;

import jakarta.ws.rs.core.Response;
import jakarta.ws.rs.ext.ExceptionMapper;
import jakarta.ws.rs.ext.Provider;

import org.jboss.resteasy.reactive.ClientWebApplicationException;

@Provider
public class FrontendExceptionMapper implements ExceptionMapper<ClientWebApplicationException> {

	@Override
	public Response toResponse(ClientWebApplicationException t) {
		return Response.status(t.getResponse().getStatus()).build();
	}

}

This exception mapper is only added to verify during the tests that ProtectedResource returns 403 when the token has no expected role. Without this mapper, Quarkus REST (formerly RESTEasy Reactive) would correctly convert the exceptions that escape from REST client calls to 500 to avoid leaking the information from the downstream resources such as ProtectedResource. However, in the tests, it would not be possible to assert that 500 is caused by an authorization exception instead of some internal error.

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