atom.ws.rs.PreferencesWebService Maven / Gradle / Ivy

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package atom.ws.rs;

import atom.content.PreferenceManager;
import org.glassfish.jersey.media.multipart.FormDataParam;

import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.prefs.BackingStoreException;
import java.util.prefs.InvalidPreferencesFormatException;
import java.util.prefs.Preferences;

/**
 * REST service definition responsible to preferences import/export actions.
 *
 * @author Serge Voloshyn
 * @version 1.2 3/1/15
 */
@Path("/preferences")
public final class PreferencesWebService {

    /**
     * Uploading file and importing it into the defined app node.
     *
     * @param name           application name
     * @param preferencesXml uploaded file
     * @return simple response with uploading state.
     */
    @POST
    @Path("/import")
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    @Produces(MediaType.TEXT_HTML)
    public Response importPrefs(
            @FormDataParam("appName") final String name,
            @FormDataParam("theFile") final InputStream preferencesXml) {
        try {
            final Preferences prefs = Preferences.userRoot()
                    .node(String.format(
                            PreferenceManager.ROOT_NODE_FORMAT, name));
            Preferences.importPreferences(preferencesXml);
            prefs.flush();
        } catch (BackingStoreException
                | InvalidPreferencesFormatException
                | IOException e) {
            e.printStackTrace();
        }
        return Response.ok().build();
    }

    /**
     * Exporting request application's preferences.
     *
     * @param name application name
     * @return simple response with uploading state.
     */
    @POST
    @Path("/export")
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    @Produces(MediaType.APPLICATION_OCTET_STREAM)
    public Response exportPrefs(@FormDataParam("appName") final String name) {
        try {
            final Preferences prefs = Preferences.userRoot().node(String.format(
                    PreferenceManager.ROOT_NODE_FORMAT, name));
            final ByteArrayOutputStream out = new ByteArrayOutputStream(1024);
            prefs.exportNode(out);
            out.flush();
            out.close();
            return Response.ok(out.toByteArray())
                    .header("Content-Disposition", String.format(
                            "attachment; filename=\"%s-app-settings.xml\"",
                            name)).build();
        } catch (BackingStoreException | IOException e) {
            e.printStackTrace();
        }
        return Response.serverError().build();
    }
}