6.8. マルチテナンシー

package example;

import java.io.InputStream;
import org.keycloak.adapters.saml.SamlConfigResolver;
import org.keycloak.adapters.saml.SamlDeployment;
import org.keycloak.adapters.saml.config.parsers.DeploymentBuilder;
import org.keycloak.adapters.saml.config.parsers.ResourceLoader;
import org.keycloak.adapters.spi.HttpFacade;
import org.keycloak.saml.common.exceptions.ParsingException;

public class SamlMultiTenantResolver implements SamlConfigResolver {

    @Override
    public SamlDeployment resolve(HttpFacade.Request request) {
        String host = request.getHeader("Host");
        String realm = null;
        if (host.contains("tenant1")) {
            realm = "tenant1";
        } else if (host.contains("tenant2")) {
            realm = "tenant2";
        } else {
            throw new IllegalStateException("Not able to guess the keycloak-saml.xml to load");
        }

        InputStream is = getClass().getResourceAsStream("/" + realm + "-keycloak-saml.xml");
        if (is == null) {
            throw new IllegalStateException("Not able to find the file /" + realm + "-keycloak-saml.xml");
        }

        ResourceLoader loader = new ResourceLoader() {
            @Override
            public InputStream getResourceAsStream(String path) {
                return getClass().getResourceAsStream(path);
            }
        };

        try {
            return new DeploymentBuilder().build(is, loader);
        } catch (ParsingException e) {
            throw new IllegalStateException("Cannot load SAML deployment", e);
        }
    }
}

<web-app>
    ...
    <context-param>
        <param-name>keycloak.config.resolver</param-name>
        <param-value>example.SamlMultiTenantResolver</param-value>
    </context-param>
</web-app>