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