fedilab-Android-App/app/src/main/java/fr/gouv/etalab/mastodon/services/StreamingService.java

package fr.gouv.etalab.mastodon.services;
/* Copyright 2017 Thomas Schneider
 *
 * This file is a part of Mastalab
 *
 * 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 3 of the
 * License, or (at your option) any later version.
 *
 * Mastalab 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 Mastalab; if not,
 * see <http://www.gnu.org/licenses>. */
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Binder;
import android.os.Bundle;
import android.os.IBinder;
import android.os.SystemClock;
import android.support.annotation.Nullable;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;

import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.ArrayList;
import javax.net.ssl.HttpsURLConnection;
import fr.gouv.etalab.mastodon.client.API;
import fr.gouv.etalab.mastodon.client.Entities.Account;
import fr.gouv.etalab.mastodon.client.Entities.Notification;
import fr.gouv.etalab.mastodon.client.Entities.Status;
import fr.gouv.etalab.mastodon.client.TLSSocketFactory;
import fr.gouv.etalab.mastodon.helper.Helper;


/**
 * Created by Thomas on 28/08/2017.
 * Manage service for streaming api and new notifications
 */

public class StreamingService extends Service {


    private static HttpsURLConnection httpsURLConnection;
    private static boolean isRunning = false;
    private AsyncTask<Void, Void, Void> callToStreaming;
    private EventStreaming lastEvent;
    public enum EventStreaming{
        UPDATE,
        NOTIFICATION,
        DELETE,
        NONE
    }
    private final IBinder iBinder = new StreamingServiceBinder();
    protected Account account;

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return START_STICKY;
    }

    public class StreamingServiceBinder extends Binder {
        public StreamingService getService() {
            return StreamingService.this;
        }
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return iBinder;
    }



    /**
     * Task in background starts here.
     */
    public void connect(final Account account) {
        this.account = account;
        //If an Internet connection and user agrees with notification refresh
        final SharedPreferences sharedpreferences = getSharedPreferences(Helper.APP_PREFS, Context.MODE_PRIVATE);
        //Check which notifications the user wants to see
        boolean notif_follow = sharedpreferences.getBoolean(Helper.SET_NOTIF_FOLLOW, true);
        boolean notif_add = sharedpreferences.getBoolean(Helper.SET_NOTIF_ADD, true);
        boolean notif_ask = sharedpreferences.getBoolean(Helper.SET_NOTIF_ASK, true);
        boolean notif_mention = sharedpreferences.getBoolean(Helper.SET_NOTIF_MENTION, true);
        boolean notif_share = sharedpreferences.getBoolean(Helper.SET_NOTIF_SHARE, true);
        boolean notif_home = sharedpreferences.getBoolean(Helper.SET_NOTIF_HOMETIMELINE, true);
        //User disagree with all notifications
        if( !notif_home && !notif_follow && !notif_add && !notif_ask && !notif_mention && !notif_share) {
            return; //Nothing is done

        }
        if( callToStreaming != null)
            callToStreaming.cancel(true);
        //No account connected, the service is stopped
        //If WIFI only and on WIFI OR user defined any connections to use the service.
        if (!sharedpreferences.getBoolean(Helper.SET_WIFI_ONLY, false) || Helper.isOnWIFI(getApplicationContext())) {
            if (!isRunning)
                callToStreaming = new CallToStreaming().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
        }
    }

    @Override
    public void onDestroy(){
        super.onDestroy();
    }

    public void longPolling() {
        //noinspection InfiniteLoopStatement
        InputStream inputStream;
        BufferedReader reader = null;
        try {
            URL url = new URL("https://" + this.account.getInstance() + "/api/v1/streaming/user");
            if( httpsURLConnection != null){
                httpsURLConnection.disconnect();
            }
            httpsURLConnection = (HttpsURLConnection) url.openConnection();
            httpsURLConnection.setRequestProperty("Content-Type", "application/json");
            httpsURLConnection.setRequestProperty("Authorization", "Bearer " + this.account.getToken());
            httpsURLConnection.setRequestProperty("Connection", "Keep-Alive");
            httpsURLConnection.setRequestProperty("Keep-Alive", "header");
            httpsURLConnection.setRequestProperty("Connection", "close");
            httpsURLConnection.setSSLSocketFactory(new TLSSocketFactory());
            httpsURLConnection.setRequestMethod("GET");
            httpsURLConnection.setConnectTimeout(70000);
            httpsURLConnection.setReadTimeout(70000);
            // httpsURLConnection.connect();
            inputStream = new BufferedInputStream(httpsURLConnection.getInputStream());
            reader = new BufferedReader(new InputStreamReader(inputStream));
            String event;
            EventStreaming eventStreaming;
            //noinspection InfiniteLoopStatement
            while((event = reader.readLine()) != null) {
                if ((lastEvent == EventStreaming.NONE || lastEvent == null) && !event.startsWith("data: ")) {
                    switch (event.trim()) {
                        case "event: update":
                            lastEvent = EventStreaming.UPDATE;
                            break;
                        case "event: notification":
                            lastEvent = EventStreaming.NOTIFICATION;
                            break;
                        case "event: delete":
                            lastEvent = EventStreaming.DELETE;
                            break;
                        default:
                            lastEvent = EventStreaming.NONE;
                    }
                } else {
                    if (!event.startsWith("data: ")) {
                        lastEvent = EventStreaming.NONE;
                        continue;
                    }
                    event = event.substring(6);
                    if (lastEvent == EventStreaming.UPDATE) {
                        eventStreaming = EventStreaming.UPDATE;
                    } else if (lastEvent == EventStreaming.NOTIFICATION) {
                        eventStreaming = EventStreaming.NOTIFICATION;
                    } else if (lastEvent == EventStreaming.DELETE) {
                        eventStreaming = EventStreaming.DELETE;
                        event = "{id:" + event + "}";
                    } else {
                        eventStreaming = EventStreaming.UPDATE;
                    }
                    lastEvent = EventStreaming.NONE;
                    try {
                        JSONObject eventJson = new JSONObject(event);
                        onRetrieveStreaming(eventStreaming, eventJson);
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            if(reader != null){
                try{
                    reader.close();
                }catch (IOException e){
                    e.printStackTrace();
                }
            }
            isRunning = false;
            connect(this.account);
        }
    }


    public void onRetrieveStreaming(EventStreaming event, JSONObject response) {
        if(  response == null )
            return;
        //No previous notifications in cache, so no notification will be sent
        Status status ;
        Notification notification;
        String dataId = null;

        Bundle b = new Bundle();
        if( event == EventStreaming.NOTIFICATION){
            notification = API.parseNotificationResponse(getApplicationContext(), response);
            b.putParcelable("data", notification);
        }else if ( event ==  EventStreaming.UPDATE){
            status = API.parseStatuses(getApplicationContext(), response);
            status.setReplies(new ArrayList<Status>());
            status.setNew(true);
            b.putParcelable("data", status);
        }else if( event == EventStreaming.DELETE){
            try {
                dataId = response.getString("id");
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        b.putString("userIdService",account.getId());
        Intent intentBC = new Intent(Helper.RECEIVE_DATA);
        intentBC.putExtra("eventStreaming", event);
        intentBC.putExtras(b);
        LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(intentBC);
    }


    private class CallToStreaming extends AsyncTask<Void, Void, Void> {


        CallToStreaming(){
            isRunning = true;
        }

        @Override
        protected Void doInBackground(Void... params) {
            if(!Helper.isConnectedToInternet(getApplicationContext(), account.getInstance())) {
                SystemClock.sleep(2000);
                isRunning = false;
                connect(account);
            }else {
                longPolling();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            isRunning = false;
        }

    }
}