```

### 2. Create a sample OPA Policy

In another terminal, create a policy that allows root user all access and for all other users denies `PutObject`:

```sh
cat > example.rego <<EOF
package httpapi.authz

import input

default allow = false

# Allow the root user to perform any action.
allow {
 input.owner == true
}

# All other users may do anything other than call PutObject
allow {

	}
}

// ConnectWS returns a function that dials a websocket connection to the given address.
// Route and auth are added to the connection.
func ConnectWS(dial ContextDialer, auth AuthFn, tls *tls.Config) func(ctx context.Context, remote string) (net.Conn, error) {
	return ConnectWSWithRoutePath(dial, auth, tls, RoutePath)
}

// ValidateTokenFn must validate the token and return an error if it is invalid.

                    return;
                }
            } else {
                final String auth = new String(Base64.decode(msg.substring(6)), "US-ASCII");
                int index = auth.indexOf(':');
                String user = index != -1 ? auth.substring(0, index) : auth;
                final String password = index != -1 ? auth.substring(index + 1) : "";
                index = user.indexOf('\\');
                if (index == -1) {

		authFields := strings.Split(strings.TrimSpace(v4Auth), ",")
		if len(authFields) != 3 {
			return auth.Credentials{}, false, ErrMissingFields
		}
		ch, s3Err = parseCredentialHeader(authFields[0], region, stype)
		if s3Err != ErrNone {
			return auth.Credentials{}, false, s3Err
		}
	}
	return checkKeyValid(r, ch.accessKey)
}

// parse credentialHeader string into its structured form.

}

type metricsV3Server struct {
	registry *prometheus.Registry
	opts     promhttp.HandlerOpts
	auth     func(http.Handler) http.Handler

	metricsData *metricsV3Collection
}

var (
	globalMetricsV3CollectorPaths []collectorPath
	globalMetricsV3Once           sync.Once
)

func newMetricsV3Server(auth func(h http.Handler) http.Handler) *metricsV3Server {
	registry := prometheus.NewRegistry()

import java.security.GeneralSecurityException;
import java.util.HashMap;
import java.util.Map;

import javax.crypto.spec.SecretKeySpec;
import javax.security.auth.kerberos.KerberosKey;
import javax.security.auth.kerberos.KerberosPrincipal;

import org.junit.jupiter.api.Test;

/**
 * Tests for the PacMac class.
 */
class PacMacTest {

package jcifs.pac.kerberos;

import java.security.Key;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import javax.security.auth.Subject;
import javax.security.auth.kerberos.KerberosKey;
import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;

/**
 * Kerberos credentials management class that handles authentication through JAAS.
 */
public class KerberosCredentials {

	// Get current object layer instance.
	objectAPI := newObjectLayerFn()
	if objectAPI == nil || globalNotificationSys == nil {
		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL)
		return nil, auth.Credentials{}
	}

	for _, action := range actions {
		// Validate request signature.

     * @param url the DCERPC URL specifying the endpoint
     * @param auth the NTLM authentication credentials
     * @throws UnknownHostException if the host cannot be resolved
     * @throws MalformedURLException if the URL is malformed
     * @throws DcerpcException if DCERPC initialization fails
     */
    public DcerpcPipeHandle(String url, final NtlmPasswordAuthentication auth)

                ssn.removeAttribute("NtlmHttpChal");
            } else {
                final String auth = new String(Base64.decode(msg.substring(6)), "US-ASCII");
                int index = auth.indexOf(':');
                String user = index != -1 ? auth.substring(0, index) : auth;
                final String password = index != -1 ? auth.substring(index + 1) : "";
                index = user.indexOf('\\');
                if (index == -1) {