then:
        def proxyCredentials = httpClientBuilder.credentialsProvider.getCredentials(new AuthScope(PROXY_HOST, SOME_PORT))
        proxyCredentials.userPrincipal.name == "domain/proxyUser"
        proxyCredentials.password == "proxyPass"

        and:
        def ntlmCredentials = httpClientBuilder.credentialsProvider.getCredentials(new AuthScope(PROXY_HOST, SOME_PORT, AuthScope.ANY_REALM, "ntlm"))

    }

    @Override
    public PasswordCredentials getCredentials() {
        return authenticationSupporter.getCredentials();
    }

    @Override
    public <T extends Credentials> T getCredentials(Class<T> credentialsType) {
        return authenticationSupporter.getCredentials(credentialsType);
    }

    @Override

        }

        @Override
        public PasswordCredentials getCredentials() {
            return delegate.getCredentials();
        }

        @Override
        public <T extends Credentials> T getCredentials(Class<T> credentialsType) {
            return delegate.getCredentials(credentialsType);
        }

        @Override

    def "fails when no aws credentials provided for auth"() {
        setup:
        def resourceConnectorSpecification = Mock(ResourceConnectorSpecification)
        1 * resourceConnectorSpecification.getCredentials(AwsCredentials) >> null
        1 * resourceConnectorSpecification.getAuthentications() >> [ new AllSchemesAuthentication(null) ]
        
        when:
        factory.createResourceConnector(resourceConnectorSpecification)

        }

        @Override
        public <T> T getCredentials(Class<T> type) {
            if (authentications == null || authentications.size() < 1) {
                return null;
            }

            Credentials credentials = ((AuthenticationInternal) authentications.iterator().next()).getCredentials();

            if (credentials == null) {
                return null;
            }

import org.gradle.internal.verifier.HttpRedirectVerifier;

import java.util.Collection;
import java.util.Collections;

public interface ResourceConnectorSpecification {
    default <T> T getCredentials(Class<T> type) {
        return null;
    }

    default Collection<Authentication> getAuthentications() {
        return Collections.emptyList();
    }

import org.apache.http.auth.Credentials;

/**
 *
 *
 * @author shinsuke
 *
 */
public interface Authentication {

    AuthScope getAuthScope();

    Credentials getCredentials();

    AuthScheme getAuthScheme();

    private WebConfig webConfig;

    public Authentication getAuthentication() {
        return new AuthenticationImpl(getAuthScope(), getCredentials(), getAuthScheme());
    }

    private AuthScheme getAuthScheme() {
        final String scheme = getProtocolScheme();
        if (Constants.BASIC.equals(scheme)) {
            return new BasicScheme();
        }

 * <p>
 * Any other type of response will be treated as an error, causing the remote cache to be disabled for the remainder of the build.
 * <p>
 * When credentials are configured (see {@link #getCredentials()}), they are sent using HTTP Basic Auth.
 * <p>
 * Requests that fail during request transmission, after having established a TCP connection, will automatically be retried.

    }

    @Override
    public ExternalResourceConnector createResourceConnector(ResourceConnectorSpecification connectionDetails) {
        PasswordCredentials passwordCredentials = connectionDetails.getCredentials(PasswordCredentials.class);
        SftpResourceAccessor accessor = new SftpResourceAccessor(sftpClientFactory, passwordCredentials);
        SftpResourceLister lister = new SftpResourceLister(sftpClientFactory, passwordCredentials);