1.2. OIDC リクエストフィルター

package io.quarkus.it.keycloak;

import jakarta.enterprise.context.ApplicationScoped;

import io.quarkus.arc.Unremovable;
import io.quarkus.oidc.common.OidcEndpoint;
import io.quarkus.oidc.common.OidcRequestFilter;
import io.vertx.core.http.HttpMethod;

@ApplicationScoped
@OidcEndpoint(value = Type.TOKEN)
@Unremovable
public class OidcRequestCustomizer implements OidcRequestFilter {

    @Override
    public void filter(OidcRequestContext requestContext) {
        HttpMethod method = requestContext.request().method();
        String uri = requestContext.request().uri();
        if (method == HttpMethod.POST && uri.endsWith("/token") && requestContext.requestBody() != null) {
            requestContext.request().putHeader("Digest", calculateDigest(requestContext.requestBody().toString()));
        }
    }

    private String calculateDigest(String bodyString) {
        // Apply the required digest algorithm to the body string
    }
}