1package eu.siacs.conversations.services;
  2
  3import android.Manifest;
  4import android.content.Context;
  5import android.content.pm.PackageManager;
  6import android.os.Build;
  7import android.os.PowerManager;
  8import android.os.SystemClock;
  9import android.util.Pair;
 10
 11import java.io.FileInputStream;
 12import java.io.FileNotFoundException;
 13import java.io.FileOutputStream;
 14import java.io.InputStream;
 15import java.io.OutputStream;
 16import java.util.concurrent.atomic.AtomicLong;
 17
 18import javax.crypto.Cipher;
 19import javax.crypto.CipherInputStream;
 20import javax.crypto.CipherOutputStream;
 21import javax.crypto.spec.IvParameterSpec;
 22import javax.crypto.spec.SecretKeySpec;
 23
 24import eu.siacs.conversations.Config;
 25import eu.siacs.conversations.R;
 26import eu.siacs.conversations.entities.DownloadableFile;
 27import eu.siacs.conversations.utils.Compatibility;
 28
 29public class AbstractConnectionManager {
 30
 31    private static final String KEYTYPE = "AES";
 32    private static final String CIPHERMODE = "AES/GCM/NoPadding";
 33    private static final String PROVIDER = "BC";
 34    private static final int UI_REFRESH_THRESHOLD = 250;
 35    private static final AtomicLong LAST_UI_UPDATE_CALL = new AtomicLong(0);
 36    protected XmppConnectionService mXmppConnectionService;
 37
 38    public AbstractConnectionManager(XmppConnectionService service) {
 39        this.mXmppConnectionService = service;
 40    }
 41
 42    public static Pair<InputStream, Integer> createInputStream(DownloadableFile file) throws FileNotFoundException {
 43        FileInputStream is;
 44        int size;
 45        is = new FileInputStream(file);
 46        size = (int) file.getSize();
 47        if (file.getKey() == null) {
 48            return new Pair<>(is, size);
 49        }
 50        try {
 51            Cipher cipher =  Cipher.getInstance(CIPHERMODE);
 52            SecretKeySpec keySpec = new SecretKeySpec(file.getKey(), KEYTYPE);
 53            IvParameterSpec ivSpec = new IvParameterSpec(file.getIv());
 54            cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
 55            return new Pair<>(new CipherInputStream(is, cipher), cipher.getOutputSize(size));
 56        } catch (Exception e) {
 57            throw new AssertionError(e);
 58        }
 59    }
 60
 61    public static OutputStream createAppendedOutputStream(DownloadableFile file) {
 62        return createOutputStream(file, true);
 63    }
 64
 65    public static OutputStream createOutputStream(DownloadableFile file) {
 66        return createOutputStream(file, false);
 67    }
 68
 69    private static OutputStream createOutputStream(DownloadableFile file, boolean append) {
 70        FileOutputStream os;
 71        try {
 72            os = new FileOutputStream(file, append);
 73            if (file.getKey() == null) {
 74                return os;
 75            }
 76        } catch (FileNotFoundException e) {
 77            return null;
 78        }
 79        try {
 80            Cipher cipher = Cipher.getInstance(CIPHERMODE);
 81            SecretKeySpec keySpec = new SecretKeySpec(file.getKey(), KEYTYPE);
 82            IvParameterSpec ivSpec = new IvParameterSpec(file.getIv());
 83            cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
 84            return new CipherOutputStream(os, cipher);
 85        } catch (Exception e) {
 86            return null;
 87        }
 88    }
 89
 90    public XmppConnectionService getXmppConnectionService() {
 91        return this.mXmppConnectionService;
 92    }
 93
 94    public long getAutoAcceptFileSize() {
 95        return this.mXmppConnectionService.getLongPreference("auto_accept_file_size", R.integer.auto_accept_filesize);
 96    }
 97
 98    public boolean hasStoragePermission() {
 99        return Compatibility.hasStoragePermission(mXmppConnectionService);
100    }
101
102    public void updateConversationUi(boolean force) {
103        synchronized (LAST_UI_UPDATE_CALL) {
104            if (force || SystemClock.elapsedRealtime() - LAST_UI_UPDATE_CALL.get() >= UI_REFRESH_THRESHOLD) {
105                LAST_UI_UPDATE_CALL.set(SystemClock.elapsedRealtime());
106                mXmppConnectionService.updateConversationUi();
107            }
108        }
109    }
110
111    public PowerManager.WakeLock createWakeLock(String name) {
112        PowerManager powerManager = (PowerManager) mXmppConnectionService.getSystemService(Context.POWER_SERVICE);
113        return powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, name);
114    }
115}