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.Log;
 10import android.util.Pair;
 11
 12import java.io.FileInputStream;
 13import java.io.FileNotFoundException;
 14import java.io.FileOutputStream;
 15import java.io.InputStream;
 16import java.io.OutputStream;
 17import java.security.InvalidAlgorithmParameterException;
 18import java.security.InvalidKeyException;
 19import java.security.NoSuchAlgorithmException;
 20import java.security.NoSuchProviderException;
 21import java.util.concurrent.atomic.AtomicLong;
 22
 23import javax.crypto.Cipher;
 24import javax.crypto.CipherInputStream;
 25import javax.crypto.CipherOutputStream;
 26import javax.crypto.NoSuchPaddingException;
 27import javax.crypto.spec.IvParameterSpec;
 28import javax.crypto.spec.SecretKeySpec;
 29
 30import eu.siacs.conversations.Config;
 31import eu.siacs.conversations.R;
 32import eu.siacs.conversations.entities.DownloadableFile;
 33import eu.siacs.conversations.utils.Compatibility;
 34
 35public class AbstractConnectionManager {
 36
 37    private static final String KEYTYPE = "AES";
 38    private static final String CIPHERMODE = "AES/GCM/NoPadding";
 39    private static final String PROVIDER = "BC";
 40    private static final int UI_REFRESH_THRESHOLD = 250;
 41    private static final AtomicLong LAST_UI_UPDATE_CALL = new AtomicLong(0);
 42    protected XmppConnectionService mXmppConnectionService;
 43
 44    public AbstractConnectionManager(XmppConnectionService service) {
 45        this.mXmppConnectionService = service;
 46    }
 47
 48    public static InputStream upgrade(DownloadableFile file, InputStream is) throws InvalidAlgorithmParameterException, NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException, NoSuchProviderException {
 49        if (file.getKey() != null && file.getIv() != null) {
 50            final Cipher cipher = Compatibility.twentyTwo() ? Cipher.getInstance(CIPHERMODE) : Cipher.getInstance(CIPHERMODE, PROVIDER);
 51            SecretKeySpec keySpec = new SecretKeySpec(file.getKey(), KEYTYPE);
 52            IvParameterSpec ivSpec = new IvParameterSpec(file.getIv());
 53            cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
 54            return new CipherInputStream(is, cipher);
 55        } else {
 56            return is;
 57        }
 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            Log.d(Config.LOGTAG,"unable to create output stream", e);
 78            return null;
 79        }
 80        try {
 81            final Cipher cipher = Compatibility.twentyTwo() ? Cipher.getInstance(CIPHERMODE) : Cipher.getInstance(CIPHERMODE, PROVIDER);
 82            SecretKeySpec keySpec = new SecretKeySpec(file.getKey(), KEYTYPE);
 83            IvParameterSpec ivSpec = new IvParameterSpec(file.getIv());
 84            cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
 85            return new CipherOutputStream(os, cipher);
 86        } catch (Exception e) {
 87            Log.d(Config.LOGTAG,"unable to create cipher output stream", e);
 88            return null;
 89        }
 90    }
 91
 92    public XmppConnectionService getXmppConnectionService() {
 93        return this.mXmppConnectionService;
 94    }
 95
 96    public long getAutoAcceptFileSize() {
 97        return this.mXmppConnectionService.getLongPreference("auto_accept_file_size", R.integer.auto_accept_filesize);
 98    }
 99
100    public boolean hasStoragePermission() {
101        return Compatibility.hasStoragePermission(mXmppConnectionService);
102    }
103
104    public void updateConversationUi(boolean force) {
105        synchronized (LAST_UI_UPDATE_CALL) {
106            if (force || SystemClock.elapsedRealtime() - LAST_UI_UPDATE_CALL.get() >= UI_REFRESH_THRESHOLD) {
107                LAST_UI_UPDATE_CALL.set(SystemClock.elapsedRealtime());
108                mXmppConnectionService.updateConversationUi();
109            }
110        }
111    }
112
113    public PowerManager.WakeLock createWakeLock(String name) {
114        PowerManager powerManager = (PowerManager) mXmppConnectionService.getSystemService(Context.POWER_SERVICE);
115        return powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, name);
116    }
117}