1package eu.siacs.conversations.services;
  2
  3import android.content.Context;
  4import android.os.PowerManager;
  5import android.os.SystemClock;
  6import android.util.Log;
  7
  8import java.io.FileNotFoundException;
  9import java.io.FileOutputStream;
 10import java.io.InputStream;
 11import java.io.OutputStream;
 12import java.security.InvalidAlgorithmParameterException;
 13import java.security.InvalidKeyException;
 14import java.security.NoSuchAlgorithmException;
 15import java.security.NoSuchProviderException;
 16import java.util.concurrent.atomic.AtomicLong;
 17
 18import javax.crypto.Cipher;
 19import javax.crypto.CipherInputStream;
 20import javax.crypto.CipherOutputStream;
 21import javax.crypto.NoSuchPaddingException;
 22import javax.crypto.spec.IvParameterSpec;
 23import javax.crypto.spec.SecretKeySpec;
 24
 25import eu.siacs.conversations.Config;
 26import eu.siacs.conversations.R;
 27import eu.siacs.conversations.entities.DownloadableFile;
 28import eu.siacs.conversations.utils.Compatibility;
 29import eu.siacs.conversations.utils.CryptoHelper;
 30
 31public class AbstractConnectionManager {
 32
 33    private static final String KEYTYPE = "AES";
 34    private static final String CIPHERMODE = "AES/GCM/NoPadding";
 35    private static final String PROVIDER = "BC";
 36    private static final int UI_REFRESH_THRESHOLD = 250;
 37    private static final AtomicLong LAST_UI_UPDATE_CALL = new AtomicLong(0);
 38    protected XmppConnectionService mXmppConnectionService;
 39
 40    public AbstractConnectionManager(XmppConnectionService service) {
 41        this.mXmppConnectionService = service;
 42    }
 43
 44    public static InputStream upgrade(DownloadableFile file, InputStream is) throws InvalidAlgorithmParameterException, NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException, NoSuchProviderException {
 45        if (file.getKey() != null && file.getIv() != null) {
 46            final Cipher cipher = Compatibility.twentyEight() ? Cipher.getInstance(CIPHERMODE) : Cipher.getInstance(CIPHERMODE, PROVIDER);
 47            SecretKeySpec keySpec = new SecretKeySpec(file.getKey(), KEYTYPE);
 48            IvParameterSpec ivSpec = new IvParameterSpec(file.getIv());
 49            cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
 50            return new CipherInputStream(is, cipher);
 51        } else {
 52            return is;
 53        }
 54    }
 55
 56
 57    public static OutputStream createAppendedOutputStream(DownloadableFile file) {
 58        return createOutputStream(file, true);
 59    }
 60
 61    public static OutputStream createOutputStream(DownloadableFile file) {
 62        return createOutputStream(file, false);
 63    }
 64
 65    private static OutputStream createOutputStream(DownloadableFile file, boolean append) {
 66        FileOutputStream os;
 67        try {
 68            os = new FileOutputStream(file, append);
 69            if (file.getKey() == null) {
 70                return os;
 71            }
 72        } catch (FileNotFoundException e) {
 73            Log.d(Config.LOGTAG,"unable to create output stream", e);
 74            return null;
 75        }
 76        try {
 77            final Cipher cipher = Compatibility.twentyEight() ? Cipher.getInstance(CIPHERMODE) : Cipher.getInstance(CIPHERMODE, PROVIDER);
 78            SecretKeySpec keySpec = new SecretKeySpec(file.getKey(), KEYTYPE);
 79            IvParameterSpec ivSpec = new IvParameterSpec(file.getIv());
 80            cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
 81            return new CipherOutputStream(os, cipher);
 82        } catch (Exception e) {
 83            Log.d(Config.LOGTAG,"unable to create cipher output stream", e);
 84            return null;
 85        }
 86    }
 87
 88    public XmppConnectionService getXmppConnectionService() {
 89        return this.mXmppConnectionService;
 90    }
 91
 92    public long getAutoAcceptFileSize() {
 93        return this.mXmppConnectionService.getLongPreference("auto_accept_file_size", R.integer.auto_accept_filesize);
 94    }
 95
 96    public boolean hasStoragePermission() {
 97        return Compatibility.hasStoragePermission(mXmppConnectionService);
 98    }
 99
100    public void updateConversationUi(boolean force) {
101        synchronized (LAST_UI_UPDATE_CALL) {
102            if (force || SystemClock.elapsedRealtime() - LAST_UI_UPDATE_CALL.get() >= UI_REFRESH_THRESHOLD) {
103                LAST_UI_UPDATE_CALL.set(SystemClock.elapsedRealtime());
104                mXmppConnectionService.updateConversationUi();
105            }
106        }
107    }
108
109    public PowerManager.WakeLock createWakeLock(String name) {
110        PowerManager powerManager = (PowerManager) mXmppConnectionService.getSystemService(Context.POWER_SERVICE);
111        return powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, name);
112    }
113
114    public static class Extension {
115        public final String main;
116        public final String secondary;
117
118        private Extension(String main, String secondary) {
119            this.main = main;
120            this.secondary = secondary;
121        }
122
123        public static Extension of(String path) {
124            final int pos = path.lastIndexOf('/');
125            final String filename = path.substring(pos + 1).toLowerCase();
126            final String[] parts = filename.split("\\.");
127            final String main = parts.length >= 2 ? parts[parts.length - 1] : null;
128            final String secondary = parts.length >= 3 ? parts[parts.length - 2] : null;
129            return new Extension(main, secondary);
130        }
131    }
132}