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    public static OutputStream createOutputStream(DownloadableFile file, boolean append, boolean decrypt) {
 57        FileOutputStream os;
 58        try {
 59            os = new FileOutputStream(file, append);
 60            if (file.getKey() == null || !decrypt) {
 61                return os;
 62            }
 63        } catch (FileNotFoundException e) {
 64            Log.d(Config.LOGTAG,"unable to create output stream", e);
 65            return null;
 66        }
 67        try {
 68            final Cipher cipher = Compatibility.twentyEight() ? Cipher.getInstance(CIPHERMODE) : Cipher.getInstance(CIPHERMODE, PROVIDER);
 69            SecretKeySpec keySpec = new SecretKeySpec(file.getKey(), KEYTYPE);
 70            IvParameterSpec ivSpec = new IvParameterSpec(file.getIv());
 71            cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
 72            return new CipherOutputStream(os, cipher);
 73        } catch (Exception e) {
 74            Log.d(Config.LOGTAG,"unable to create cipher output stream", e);
 75            return null;
 76        }
 77    }
 78
 79    public XmppConnectionService getXmppConnectionService() {
 80        return this.mXmppConnectionService;
 81    }
 82
 83    public long getAutoAcceptFileSize() {
 84        return this.mXmppConnectionService.getLongPreference("auto_accept_file_size", R.integer.auto_accept_filesize);
 85    }
 86
 87    public boolean hasStoragePermission() {
 88        return Compatibility.hasStoragePermission(mXmppConnectionService);
 89    }
 90
 91    public void updateConversationUi(boolean force) {
 92        synchronized (LAST_UI_UPDATE_CALL) {
 93            if (force || SystemClock.elapsedRealtime() - LAST_UI_UPDATE_CALL.get() >= UI_REFRESH_THRESHOLD) {
 94                LAST_UI_UPDATE_CALL.set(SystemClock.elapsedRealtime());
 95                mXmppConnectionService.updateConversationUi();
 96            }
 97        }
 98    }
 99
100    public PowerManager.WakeLock createWakeLock(String name) {
101        PowerManager powerManager = (PowerManager) mXmppConnectionService.getSystemService(Context.POWER_SERVICE);
102        return powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, name);
103    }
104
105    public static class Extension {
106        public final String main;
107        public final String secondary;
108
109        private Extension(String main, String secondary) {
110            this.main = main;
111            this.secondary = secondary;
112        }
113
114        public static Extension of(String path) {
115            final int pos = path.lastIndexOf('/');
116            final String filename = path.substring(pos + 1).toLowerCase();
117            final String[] parts = filename.split("\\.");
118            final String main = parts.length >= 2 ? parts[parts.length - 1] : null;
119            final String secondary = parts.length >= 3 ? parts[parts.length - 2] : null;
120            return new Extension(main, secondary);
121        }
122    }
123}