1.5.2. RestClient JsonWebTokenRequestFilter

Using JsonWebTokenRequestFilter is recommended if you work with Bearer JWT tokens where these tokens can have their claims, such as issuer and audience modified and the updated tokens secured (for example, re-signed) again. It expects an injected org.eclipse.microprofile.jwt.JsonWebToken and, therefore, will not work with the opaque tokens. Also, if your OpenID Connect Provider supports a Token Exchange protocol, then it is recommended to use AccessTokenRequestFilter instead - as both JWT and opaque bearer tokens can be securely exchanged with AccessTokenRequestFilter.

JsonWebTokenRequestFilter makes it easy for Service A implementations to update the injected org.eclipse.microprofile.jwt.JsonWebToken with the new issuer and audience claim values and secure the updated token again with a new signature. The only difficult step is ensuring that Service A has a signing key which should be provisioned from a secure file system or remote secure storage such as Vault.

You can selectively register JsonWebTokenRequestFilter by using either io.quarkus.oidc.token.propagation.JsonWebToken or org.eclipse.microprofile.rest.client.annotation.RegisterProvider, for example:

import org.eclipse.microprofile.rest.client.inject.RegisterRestClient;
import io.quarkus.oidc.token.propagation.JsonWebToken;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.Path;

@RegisterRestClient
@JsonWebToken
@Path("/")
public interface ProtectedResourceService {

    @GET
    String getUserName();
}

or

import org.eclipse.microprofile.rest.client.annotation.RegisterProvider;
import org.eclipse.microprofile.rest.client.inject.RegisterRestClient;
import io.quarkus.oidc.token.propagation.JsonWebTokenRequestFilter;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.Path;

@RegisterRestClient
@RegisterProvider(JsonWebTokenRequestFilter.class)
@Path("/")
public interface ProtectedResourceService {

    @GET
    String getUserName();
}

Alternatively, JsonWebTokenRequestFilter can be registered automatically with all MicroProfile REST or Jakarta REST clients if both quarkus.resteasy-client-oidc-token-propagation.register-filter and quarkus.resteasy-client-oidc-token-propagation.json-web-token properties are set to true.

quarkus.resteasy-client-oidc-token-propagation.secure-json-web-token=true
smallrye.jwt.sign.key.location=/privateKey.pem
# Set a new issuer
smallrye.jwt.new-token.issuer=http://frontend-resource
# Set a new audience
smallrye.jwt.new-token.audience=http://downstream-resource
# Override the existing token issuer and audience claims if they are already set
smallrye.jwt.new-token.override-matching-claims=true