android_frameworks_base/keystore/java/android/security/GateKeeper.java

package android.security;

import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.UserHandle;
import android.service.gatekeeper.IGateKeeperService;

/**
 * Convenience class for accessing the gatekeeper service.
 *
 * @hide
 */
public abstract class GateKeeper {

    private GateKeeper() {}

    public static IGateKeeperService getService() {
        IGateKeeperService service = IGateKeeperService.Stub.asInterface(
                ServiceManager.getService("android.service.gatekeeper.IGateKeeperService"));
        if (service == null) {
            throw new IllegalStateException("Gatekeeper service not available");
        }
        return service;
    }

    public static long getSecureUserId() throws IllegalStateException {
        try {
            return getService().getSecureUserId(UserHandle.myUserId());
        } catch (RemoteException e) {
            throw new IllegalStateException(
                    "Failed to obtain secure user ID from gatekeeper", e);
        }
    }
}