com.pwcgarage.ibeaconref.restclients.EventHubRestClient.java Source code

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Here is the source code for com.pwcgarage.ibeaconref.restclients.EventHubRestClient.java

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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.pwcgarage.ibeaconref.restclients;

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

import org.apache.http.Header;
import org.apache.http.entity.StringEntity;
import org.json.JSONObject;

import android.content.Context;
import android.util.Log;

import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.pwcgarage.ibeaconref.BeaconReferenceApplication;
import com.pwcgarage.ibeaconref.eventbus.EventBus;
import com.pwcgarage.ibeaconref.eventbus.EventHubCallStatusEvent;
import com.pwcgarage.ibeaconref.utils.DeviceUuidFactory;
import com.pwcgarage.ibeaconref.utils.SaSignatureTokenGenerator;

/**
 * @author asksven
 */
public class EventHubRestClient {

    private static AsyncHttpClient m_httpClient = null;
    private static EventHubRestClient m_client = null;
    private static long tokenExpiresAt = 0L;
    private static final String TAG = "EventHubRestClient";

    private void EventHubRestClient() {

    }

    public static EventHubRestClient getInstance() {
        if (m_client == null) {
            m_client = new EventHubRestClient();
            m_httpClient = getRestClient();

        }

        return m_client;
    }

    /** 
     * Returns an http client calid for a given time
     * @return
     */
    private static AsyncHttpClient getRestClient() {
        AsyncHttpClient ret = new AsyncHttpClient();

        String SaSignature = SaSignatureTokenGenerator.generateSaSignatureToken(Constants.EVENTHUB_URL,
                Constants.EVENTHUB_POLICY_NAME, Constants.EVENTHUB_POLICY_KEY, Constants.EVENTHUB_TTL_MINUTES);
        tokenExpiresAt = System.currentTimeMillis() + (Constants.EVENTHUB_TTL_MINUTES * 60L * 1000L);

        ret.addHeader("Authorization", SaSignature);

        return ret;
    }

    public void sendEvent(Context ctx, String region, String action) {
        // check if our SAS Token has expired. If yes get a new REST client with a fresh token
        if (System.currentTimeMillis() > tokenExpiresAt) {
            m_httpClient = getRestClient();
        }

        // Assert parameters
        if (!(action.equals(BeaconReferenceApplication.ACTION_ENTER)
                || action.equals(BeaconReferenceApplication.ACTION_LEAVE)
                || action.equals(BeaconReferenceApplication.ACTION_TEST))) {
            action = BeaconReferenceApplication.ACTION_UNKNOWN;
        }

        JSONObject params = new JSONObject();

        try {
            params.put("DeviceId", new DeviceUuidFactory(ctx).getDeviceUuid());
            params.put("TimeUTC", getCurrentTimeUtc());
            params.put("Region", region);
            params.put("Action", action);
            StringEntity entity = new StringEntity(params.toString());
            m_httpClient.post(ctx, Constants.EVENTHUB_URL + "/" + Constants.EVENTHUB_QUEUE_PATH, entity,
                    "application/atom+xml;type=entry;charset=utf-8", new AsyncHttpResponseHandler() {

                        @Override
                        public void onFailure(int statusCode, Header[] headers, byte[] responseBody,
                                Throwable error) {
                            Log.d(TAG, "Request failed with statusCode=" + statusCode + " with message="
                                    + error.getMessage());
                            // post event to eventbus
                            EventBus.getInstance()
                                    .post(new EventHubCallStatusEvent(EventHubCallStatusEvent.Type.COMPLETED, 0));

                        }

                        @Override
                        public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
                            Log.d(TAG, "Request succeeded");
                            // post event to eventbus
                            EventBus.getInstance()
                                    .post(new EventHubCallStatusEvent(EventHubCallStatusEvent.Type.COMPLETED, 1));
                        }
                    });
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    protected static String getCurrentTimeUtc() {
        final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
        final String utcTime = sdf.format(new Date());
        return utcTime;

    }
}