Chapter4.java

import com.google.api.services.drive.model.Permission;
import com.google.api.services.drive.model.PermissionList;

import java.io.IOException;
import java.security.GeneralSecurityException;


public boolean publishForm(String formId, String token) throws GeneralSecurityException, IOException {

    PermissionList list = driveService.permissions().list(formId).setOauthToken(token).execute();

    if (list.getPermissions().stream().filter((it) -> it.getRole().equals("reader")).findAny().isEmpty()) {
        Permission body = new Permission();
        body.setRole("reader");
        body.setType("anyone");
        driveService.permissions().create(formId, body).setOauthToken(token).execute();
        return true;
    }

    return false;
}