org.akvo.flow.service.TimeCheckService.java Source code

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Here is the source code for org.akvo.flow.service.TimeCheckService.java

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/*
* Copyright (C) 2010-2014 Stichting Akvo (Akvo Foundation)
*
* This file is part of Akvo FLOW.
*
* Akvo FLOW is free software: you can redistribute it and modify it under the terms of
* the GNU Affero General Public License (AGPL) as published by the Free Software Foundation,
* either version 3 of the License or any later version.
*
* Akvo FLOW 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 Affero General Public License included below for more details.
*
* The full license text can also be seen at <http://www.gnu.org/licenses/agpl.html>.
*/

package org.akvo.flow.service;

import android.app.IntentService;
import android.content.Intent;
import android.text.TextUtils;
import android.util.Log;

import org.akvo.flow.activity.TimeCheckActivity;
import org.akvo.flow.exception.PersistentUncaughtExceptionHandler;
import org.akvo.flow.util.HttpUtil;
import org.akvo.flow.util.StatusUtil;
import org.json.JSONObject;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.TimeZone;

public class TimeCheckService extends IntentService {
    private static final String TAG = TimeCheckService.class.getSimpleName();
    private static final String TIME_CHECK_PATH = "/devicetimerest";
    private static final long OFFSET_THRESHOLD = 13 * 60 * 1000;// 13 minutes
    private static final String PATTERN = "yyyy-MM-dd'T'HH:mm:ss'Z'";// ISO 8601
    private static final String TIMEZONE = "UTC";

    public TimeCheckService() {
        super(TAG);
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        Thread.setDefaultUncaughtExceptionHandler(PersistentUncaughtExceptionHandler.getInstance());
        checkTime();
    }

    private void checkTime() {
        if (!StatusUtil.hasDataConnection(this)) {
            Log.d(TAG, "No internet connection. Can't perform the time check.");
            return;
        }

        // Since a misconfigured date/time might be considering the SSL certificate as expired,
        // we'll use HTTP by default, instead of HTTPS
        String serverBase = StatusUtil.getServerBase(this);
        if (serverBase.startsWith("https")) {
            serverBase = "http" + serverBase.substring("https".length());
        }

        try {
            final String url = serverBase + TIME_CHECK_PATH;
            String response = HttpUtil.httpGet(url);
            if (!TextUtils.isEmpty(response)) {
                JSONObject json = new JSONObject(response);
                String time = json.getString("time");
                if (!TextUtils.isEmpty(time) && !time.equalsIgnoreCase("null")) {
                    DateFormat df = new SimpleDateFormat(PATTERN);
                    df.setTimeZone(TimeZone.getTimeZone(TIMEZONE));
                    final long remote = df.parse(time).getTime();
                    final long local = System.currentTimeMillis();
                    boolean onTime = Math.abs(remote - local) < OFFSET_THRESHOLD;

                    if (!onTime) {
                        Intent i = new Intent(this, TimeCheckActivity.class);
                        i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                        startActivity(i);
                    }
                }
            }
        } catch (Exception e) {
            Log.e(TAG, "Error fetching time: ", e);
            PersistentUncaughtExceptionHandler.recordException(e);
        }
    }

}