pwm/data-service/src/main/java/password/pwm/receiver/TelemetryRestReceiver.java

/*
 * Password Management Servlets (PWM)
 * http://www.pwm-project.org
 *
 * Copyright (c) 2006-2009 Novell, Inc.
 * Copyright (c) 2009-2017 The PWM Project
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

package password.pwm.receiver;

import org.apache.commons.io.IOUtils;
import password.pwm.PwmConstants;
import password.pwm.bean.TelemetryPublishBean;
import password.pwm.error.ErrorInformation;
import password.pwm.error.PwmError;
import password.pwm.error.PwmUnrecoverableException;
import password.pwm.i18n.Message;
import password.pwm.util.java.JsonUtil;
import password.pwm.ws.server.RestResultBean;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringWriter;

@WebServlet(
        name="TelemetryRestReceiver",
        urlPatterns={
                "/telemetry",
        }
)

public class TelemetryRestReceiver extends HttpServlet {
    @Override
    protected void doPost(final HttpServletRequest req, final HttpServletResponse resp)
            throws ServletException, IOException
    {
        try {
            resp.setHeader("Content","application/json");
            final String input = readRequestBodyAsString(req, 1024 * 1024);
            final TelemetryPublishBean telemetryPublishBean = JsonUtil.deserialize(input, TelemetryPublishBean.class);
            final Storage stoage = ContextManager.getContextManager(this.getServletContext()).getApp().getStorage();
            stoage.store(telemetryPublishBean);
            resp.getWriter().print(RestResultBean.forSuccessMessage(null, null, null, Message.Success_Unknown).toJson());
        } catch (PwmUnrecoverableException e) {
            resp.getWriter().print(RestResultBean.fromError(e.getErrorInformation()).toJson());
        } catch (Exception e) {
            final RestResultBean restResultBean = RestResultBean.fromError(new ErrorInformation(PwmError.ERROR_UNKNOWN, e.getMessage()));
            resp.getWriter().print(restResultBean.toJson());
        }
    }

    private static String readRequestBodyAsString(final HttpServletRequest req, final int maxChars)
            throws IOException, PwmUnrecoverableException
    {
        final StringWriter stringWriter = new StringWriter();
        final Reader readerStream = new InputStreamReader(
                req.getInputStream(),
                PwmConstants.DEFAULT_CHARSET
        );

        try {
            IOUtils.copy(readerStream, stringWriter);
        } catch (Exception e) {
            final String errorMsg = "error reading request body stream: " + e.getMessage();
            throw new PwmUnrecoverableException(new ErrorInformation(PwmError.ERROR_UNKNOWN,errorMsg));
        } finally {
            IOUtils.closeQuietly(readerStream);
        }

        final String stringValue = stringWriter.toString();
        if (stringValue.length() > maxChars) {
            throw new PwmUnrecoverableException(new ErrorInformation(PwmError.ERROR_UNKNOWN,"input request body is to big, size=" + stringValue.length() + ", max=" + maxChars));
        }
        return stringValue;
    }
}