1package eu.siacs.conversations.persistance;
   2
   3import android.annotation.TargetApi;
   4import android.content.ContentResolver;
   5import android.content.Context;
   6import android.content.Intent;
   7import android.database.Cursor;
   8import android.graphics.Bitmap;
   9import android.graphics.BitmapFactory;
  10import android.graphics.Canvas;
  11import android.graphics.Color;
  12import android.graphics.Matrix;
  13import android.graphics.Paint;
  14import android.graphics.RectF;
  15import android.media.MediaMetadataRetriever;
  16import android.net.Uri;
  17import android.os.Build;
  18import android.os.Environment;
  19import android.os.ParcelFileDescriptor;
  20import android.provider.MediaStore;
  21import android.provider.OpenableColumns;
  22import android.support.v4.content.FileProvider;
  23import android.system.Os;
  24import android.system.StructStat;
  25import android.util.Base64;
  26import android.util.Base64OutputStream;
  27import android.util.Log;
  28import android.util.LruCache;
  29
  30import java.io.ByteArrayOutputStream;
  31import java.io.Closeable;
  32import java.io.File;
  33import java.io.FileDescriptor;
  34import java.io.FileInputStream;
  35import java.io.FileNotFoundException;
  36import java.io.FileOutputStream;
  37import java.io.IOException;
  38import java.io.InputStream;
  39import java.io.OutputStream;
  40import java.net.Socket;
  41import java.net.URL;
  42import java.security.DigestOutputStream;
  43import java.security.MessageDigest;
  44import java.security.NoSuchAlgorithmException;
  45import java.text.SimpleDateFormat;
  46import java.util.ArrayList;
  47import java.util.Date;
  48import java.util.List;
  49import java.util.Locale;
  50import java.util.UUID;
  51
  52import eu.siacs.conversations.Config;
  53import eu.siacs.conversations.R;
  54import eu.siacs.conversations.entities.DownloadableFile;
  55import eu.siacs.conversations.entities.Message;
  56import eu.siacs.conversations.services.XmppConnectionService;
  57import eu.siacs.conversations.ui.RecordingActivity;
  58import eu.siacs.conversations.ui.util.Attachment;
  59import eu.siacs.conversations.utils.CryptoHelper;
  60import eu.siacs.conversations.utils.ExifHelper;
  61import eu.siacs.conversations.utils.FileUtils;
  62import eu.siacs.conversations.utils.FileWriterException;
  63import eu.siacs.conversations.utils.MimeUtils;
  64import eu.siacs.conversations.xmpp.pep.Avatar;
  65
  66public class FileBackend {
  67
  68    private static final Object THUMBNAIL_LOCK = new Object();
  69
  70    private static final SimpleDateFormat IMAGE_DATE_FORMAT = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US);
  71
  72    private static final String FILE_PROVIDER = ".files";
  73
  74    private XmppConnectionService mXmppConnectionService;
  75
  76    private static final float IGNORE_PADDING = 0.15f;
  77
  78    public FileBackend(XmppConnectionService service) {
  79        this.mXmppConnectionService = service;
  80    }
  81
  82    private static boolean isInDirectoryThatShouldNotBeScanned(Context context, File file) {
  83        return isInDirectoryThatShouldNotBeScanned(context, file.getAbsolutePath());
  84    }
  85
  86    public static boolean isInDirectoryThatShouldNotBeScanned(Context context, String path) {
  87        for (String type : new String[]{RecordingActivity.STORAGE_DIRECTORY_TYPE_NAME, "Files"}) {
  88            if (path.startsWith(getConversationsDirectory(context, type))) {
  89                return true;
  90            }
  91        }
  92        return false;
  93    }
  94
  95    public static long getFileSize(Context context, Uri uri) {
  96        try {
  97            final Cursor cursor = context.getContentResolver().query(uri, null, null, null, null);
  98            if (cursor != null && cursor.moveToFirst()) {
  99                long size = cursor.getLong(cursor.getColumnIndex(OpenableColumns.SIZE));
 100                cursor.close();
 101                return size;
 102            } else {
 103                return -1;
 104            }
 105        } catch (Exception e) {
 106            return -1;
 107        }
 108    }
 109
 110    public static boolean allFilesUnderSize(Context context, List<Attachment> attachments, long max) {
 111        if (max <= 0) {
 112            Log.d(Config.LOGTAG, "server did not report max file size for http upload");
 113            return true; //exception to be compatible with HTTP Upload < v0.2
 114        }
 115        for (Attachment attachment : attachments) {
 116            if (attachment.getType() != Attachment.Type.FILE) {
 117                continue;
 118            }
 119            String mime = attachment.getMime();
 120            if (mime != null && mime.startsWith("video/")) {
 121                try {
 122                    Dimensions dimensions = FileBackend.getVideoDimensions(context, attachment.getUri());
 123                    if (dimensions.getMin() > 720) {
 124                        Log.d(Config.LOGTAG, "do not consider video file with min width larger than 720 for size check");
 125                        continue;
 126                    }
 127                } catch (NotAVideoFile notAVideoFile) {
 128                    //ignore and fall through
 129                }
 130            }
 131            if (FileBackend.getFileSize(context, attachment.getUri()) > max) {
 132                Log.d(Config.LOGTAG, "not all files are under " + max + " bytes. suggesting falling back to jingle");
 133                return false;
 134            }
 135        }
 136        return true;
 137    }
 138
 139    public static String getConversationsDirectory(Context context, final String type) {
 140        if (Config.ONLY_INTERNAL_STORAGE) {
 141            return context.getFilesDir().getAbsolutePath() + "/" + type + "/";
 142        } else {
 143            return getAppMediaDirectory(context) + context.getString(R.string.app_name) + " " + type + "/";
 144        }
 145    }
 146
 147    public static String getAppMediaDirectory(Context context) {
 148        return Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + context.getString(R.string.app_name) + "/Media/";
 149    }
 150
 151    public static String getConversationsLogsDirectory() {
 152        return Environment.getExternalStorageDirectory().getAbsolutePath() + "/Conversations/";
 153    }
 154
 155    private static Bitmap rotate(Bitmap bitmap, int degree) {
 156        if (degree == 0) {
 157            return bitmap;
 158        }
 159        int w = bitmap.getWidth();
 160        int h = bitmap.getHeight();
 161        Matrix mtx = new Matrix();
 162        mtx.postRotate(degree);
 163        Bitmap result = Bitmap.createBitmap(bitmap, 0, 0, w, h, mtx, true);
 164        if (bitmap != null && !bitmap.isRecycled()) {
 165            bitmap.recycle();
 166        }
 167        return result;
 168    }
 169
 170    public static boolean isPathBlacklisted(String path) {
 171        final String androidDataPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Android/data/";
 172        return path.startsWith(androidDataPath);
 173    }
 174
 175    private static Paint createAntiAliasingPaint() {
 176        Paint paint = new Paint();
 177        paint.setAntiAlias(true);
 178        paint.setFilterBitmap(true);
 179        paint.setDither(true);
 180        return paint;
 181    }
 182
 183    private static String getTakePhotoPath() {
 184        return Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM) + "/Camera/";
 185    }
 186
 187    public static Uri getUriForFile(Context context, File file) {
 188        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N || Config.ONLY_INTERNAL_STORAGE) {
 189            try {
 190                return FileProvider.getUriForFile(context, getAuthority(context), file);
 191            } catch (IllegalArgumentException e) {
 192                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
 193                    throw new SecurityException(e);
 194                } else {
 195                    return Uri.fromFile(file);
 196                }
 197            }
 198        } else {
 199            return Uri.fromFile(file);
 200        }
 201    }
 202
 203    public static String getAuthority(Context context) {
 204        return context.getPackageName() + FILE_PROVIDER;
 205    }
 206
 207    private static boolean hasAlpha(final Bitmap bitmap) {
 208        for (int x = 0; x < bitmap.getWidth(); ++x) {
 209            for (int y = 0; y < bitmap.getWidth(); ++y) {
 210                if (Color.alpha(bitmap.getPixel(x, y)) < 255) {
 211                    return true;
 212                }
 213            }
 214        }
 215        return false;
 216    }
 217
 218    private static int calcSampleSize(File image, int size) {
 219        BitmapFactory.Options options = new BitmapFactory.Options();
 220        options.inJustDecodeBounds = true;
 221        BitmapFactory.decodeFile(image.getAbsolutePath(), options);
 222        return calcSampleSize(options, size);
 223    }
 224
 225
 226    private static int calcSampleSize(BitmapFactory.Options options, int size) {
 227        int height = options.outHeight;
 228        int width = options.outWidth;
 229        int inSampleSize = 1;
 230
 231        if (height > size || width > size) {
 232            int halfHeight = height / 2;
 233            int halfWidth = width / 2;
 234
 235            while ((halfHeight / inSampleSize) > size
 236                    && (halfWidth / inSampleSize) > size) {
 237                inSampleSize *= 2;
 238            }
 239        }
 240        return inSampleSize;
 241    }
 242
 243    public Bitmap getPreviewForUri(Attachment attachment, int size, boolean cacheOnly) {
 244        final String key = "attachment_"+attachment.getUuid().toString()+"_"+String.valueOf(size);
 245        final LruCache<String, Bitmap> cache = mXmppConnectionService.getBitmapCache();
 246        Bitmap bitmap = cache.get(key);
 247        if (bitmap != null || cacheOnly) {
 248            return bitmap;
 249        }
 250        if (attachment.getMime() != null && attachment.getMime().startsWith("video/")) {
 251            bitmap = cropCenterSquareVideo(attachment.getUri(), size);
 252            drawOverlay(bitmap, paintOverlayBlack(bitmap) ? R.drawable.play_video_black : R.drawable.play_video_white, 0.75f);
 253        } else {
 254            bitmap = cropCenterSquare(attachment.getUri(), size);
 255            if (bitmap != null && "image/gif".equals(attachment.getMime())) {
 256                Bitmap withGifOverlay = bitmap.copy(Bitmap.Config.ARGB_8888, true);
 257                drawOverlay(withGifOverlay, paintOverlayBlack(withGifOverlay) ? R.drawable.play_gif_black : R.drawable.play_gif_white, 1.0f);
 258                bitmap.recycle();
 259                bitmap = withGifOverlay;
 260            }
 261        }
 262        if (bitmap != null) {
 263            cache.put(key, bitmap);
 264        }
 265        return bitmap;
 266    }
 267
 268    private static Dimensions getVideoDimensions(Context context, Uri uri) throws NotAVideoFile {
 269        MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever();
 270        try {
 271            mediaMetadataRetriever.setDataSource(context, uri);
 272        } catch (RuntimeException e) {
 273            throw new NotAVideoFile(e);
 274        }
 275        return getVideoDimensions(mediaMetadataRetriever);
 276    }
 277
 278    private static Dimensions getVideoDimensionsOfFrame(MediaMetadataRetriever mediaMetadataRetriever) {
 279        Bitmap bitmap = null;
 280        try {
 281            bitmap = mediaMetadataRetriever.getFrameAtTime();
 282            return new Dimensions(bitmap.getHeight(), bitmap.getWidth());
 283        } catch (Exception e) {
 284            return null;
 285        } finally {
 286            if (bitmap != null) {
 287                bitmap.recycle();
 288                ;
 289            }
 290        }
 291    }
 292
 293    private static Dimensions getVideoDimensions(MediaMetadataRetriever metadataRetriever) throws NotAVideoFile {
 294        String hasVideo = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_HAS_VIDEO);
 295        if (hasVideo == null) {
 296            throw new NotAVideoFile();
 297        }
 298        Dimensions dimensions = getVideoDimensionsOfFrame(metadataRetriever);
 299        if (dimensions != null) {
 300            return dimensions;
 301        }
 302        int rotation = extractRotationFromMediaRetriever(metadataRetriever);
 303        boolean rotated = rotation == 90 || rotation == 270;
 304        int height;
 305        try {
 306            String h = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT);
 307            height = Integer.parseInt(h);
 308        } catch (Exception e) {
 309            height = -1;
 310        }
 311        int width;
 312        try {
 313            String w = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH);
 314            width = Integer.parseInt(w);
 315        } catch (Exception e) {
 316            width = -1;
 317        }
 318        metadataRetriever.release();
 319        Log.d(Config.LOGTAG, "extracted video dims " + width + "x" + height);
 320        return rotated ? new Dimensions(width, height) : new Dimensions(height, width);
 321    }
 322
 323    private static int extractRotationFromMediaRetriever(MediaMetadataRetriever metadataRetriever) {
 324        String r = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_ROTATION);
 325        try {
 326            return Integer.parseInt(r);
 327        } catch (Exception e) {
 328            return 0;
 329        }
 330    }
 331
 332    public static void close(Closeable stream) {
 333        if (stream != null) {
 334            try {
 335                stream.close();
 336            } catch (IOException e) {
 337            }
 338        }
 339    }
 340
 341    public static void close(Socket socket) {
 342        if (socket != null) {
 343            try {
 344                socket.close();
 345            } catch (IOException e) {
 346            }
 347        }
 348    }
 349
 350    public static boolean weOwnFile(Context context, Uri uri) {
 351        if (uri == null || !ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
 352            return false;
 353        } else if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
 354            return fileIsInFilesDir(context, uri);
 355        } else {
 356            return weOwnFileLollipop(uri);
 357        }
 358    }
 359
 360    /**
 361     * This is more than hacky but probably way better than doing nothing
 362     * Further 'optimizations' might contain to get the parents of CacheDir and NoBackupDir
 363     * and check against those as well
 364     */
 365    private static boolean fileIsInFilesDir(Context context, Uri uri) {
 366        try {
 367            final String haystack = context.getFilesDir().getParentFile().getCanonicalPath();
 368            final String needle = new File(uri.getPath()).getCanonicalPath();
 369            return needle.startsWith(haystack);
 370        } catch (IOException e) {
 371            return false;
 372        }
 373    }
 374
 375    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
 376    private static boolean weOwnFileLollipop(Uri uri) {
 377        try {
 378            File file = new File(uri.getPath());
 379            FileDescriptor fd = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY).getFileDescriptor();
 380            StructStat st = Os.fstat(fd);
 381            return st.st_uid == android.os.Process.myUid();
 382        } catch (FileNotFoundException e) {
 383            return false;
 384        } catch (Exception e) {
 385            return true;
 386        }
 387    }
 388
 389    private void createNoMedia(File diretory) {
 390        final File noMedia = new File(diretory, ".nomedia");
 391        if (!noMedia.exists()) {
 392            try {
 393                if (!noMedia.createNewFile()) {
 394                    Log.d(Config.LOGTAG, "created nomedia file " + noMedia.getAbsolutePath());
 395                }
 396            } catch (Exception e) {
 397                Log.d(Config.LOGTAG, "could not create nomedia file");
 398            }
 399        }
 400    }
 401
 402    public void updateMediaScanner(File file) {
 403        if (!isInDirectoryThatShouldNotBeScanned(mXmppConnectionService, file)) {
 404            Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
 405            intent.setData(Uri.fromFile(file));
 406            mXmppConnectionService.sendBroadcast(intent);
 407        } else if (file.getAbsolutePath().startsWith(getAppMediaDirectory(mXmppConnectionService))) {
 408            createNoMedia(file.getParentFile());
 409        }
 410    }
 411
 412    public boolean deleteFile(Message message) {
 413        File file = getFile(message);
 414        if (file.delete()) {
 415            updateMediaScanner(file);
 416            return true;
 417        } else {
 418            return false;
 419        }
 420    }
 421
 422    public DownloadableFile getFile(Message message) {
 423        return getFile(message, true);
 424    }
 425
 426    public DownloadableFile getFileForPath(String path, String mime) {
 427        final DownloadableFile file;
 428        if (path.startsWith("/")) {
 429            file = new DownloadableFile(path);
 430        } else {
 431            if (mime != null && mime.startsWith("image/")) {
 432                file = new DownloadableFile(getConversationsDirectory("Images") + path);
 433            } else if (mime != null && mime.startsWith("video/")) {
 434                file = new DownloadableFile(getConversationsDirectory("Videos") + path);
 435            } else {
 436                file = new DownloadableFile(getConversationsDirectory("Files") + path);
 437            }
 438        }
 439        return file;
 440    }
 441
 442    public DownloadableFile getFile(Message message, boolean decrypted) {
 443        final boolean encrypted = !decrypted
 444                && (message.getEncryption() == Message.ENCRYPTION_PGP
 445                || message.getEncryption() == Message.ENCRYPTION_DECRYPTED);
 446        String path = message.getRelativeFilePath();
 447        if (path == null) {
 448            path = message.getUuid();
 449        }
 450        final DownloadableFile file = getFileForPath(path, message.getMimeType());
 451        if (encrypted) {
 452            return new DownloadableFile(getConversationsDirectory("Files") + file.getName() + ".pgp");
 453        } else {
 454            return file;
 455        }
 456    }
 457
 458    public List<Attachment> convertToAttachments(List<DatabaseBackend.FilePath> relativeFilePaths) {
 459        List<Attachment> attachments = new ArrayList<>();
 460        for(DatabaseBackend.FilePath relativeFilePath : relativeFilePaths) {
 461            final String mime = MimeUtils.guessMimeTypeFromExtension(MimeUtils.extractRelevantExtension(relativeFilePath.path));
 462            Log.d(Config.LOGTAG,"mime="+mime);
 463            File file = getFileForPath(relativeFilePath.path, mime);
 464            if (file.exists()) {
 465                attachments.add(Attachment.of(relativeFilePath.uuid, file,mime));
 466            } else {
 467                Log.d(Config.LOGTAG,"file "+file.getAbsolutePath()+" doesnt exist");
 468            }
 469        }
 470        return attachments;
 471    }
 472
 473    private String getConversationsDirectory(final String type) {
 474        return getConversationsDirectory(mXmppConnectionService, type);
 475    }
 476
 477    private Bitmap resize(final Bitmap originalBitmap, int size) throws IOException {
 478        int w = originalBitmap.getWidth();
 479        int h = originalBitmap.getHeight();
 480        if (w <= 0 || h <= 0) {
 481            throw new IOException("Decoded bitmap reported bounds smaller 0");
 482        } else if (Math.max(w, h) > size) {
 483            int scalledW;
 484            int scalledH;
 485            if (w <= h) {
 486                scalledW = Math.max((int) (w / ((double) h / size)), 1);
 487                scalledH = size;
 488            } else {
 489                scalledW = size;
 490                scalledH = Math.max((int) (h / ((double) w / size)), 1);
 491            }
 492            final Bitmap result = Bitmap.createScaledBitmap(originalBitmap, scalledW, scalledH, true);
 493            if (!originalBitmap.isRecycled()) {
 494                originalBitmap.recycle();
 495            }
 496            return result;
 497        } else {
 498            return originalBitmap;
 499        }
 500    }
 501
 502    public boolean useImageAsIs(Uri uri) {
 503        String path = getOriginalPath(uri);
 504        if (path == null || isPathBlacklisted(path)) {
 505            return false;
 506        }
 507        File file = new File(path);
 508        long size = file.length();
 509        if (size == 0 || size >= mXmppConnectionService.getResources().getInteger(R.integer.auto_accept_filesize)) {
 510            return false;
 511        }
 512        BitmapFactory.Options options = new BitmapFactory.Options();
 513        options.inJustDecodeBounds = true;
 514        try {
 515            BitmapFactory.decodeStream(mXmppConnectionService.getContentResolver().openInputStream(uri), null, options);
 516            if (options.outMimeType == null || options.outHeight <= 0 || options.outWidth <= 0) {
 517                return false;
 518            }
 519            return (options.outWidth <= Config.IMAGE_SIZE && options.outHeight <= Config.IMAGE_SIZE && options.outMimeType.contains(Config.IMAGE_FORMAT.name().toLowerCase()));
 520        } catch (FileNotFoundException e) {
 521            return false;
 522        }
 523    }
 524
 525    public String getOriginalPath(Uri uri) {
 526        return FileUtils.getPath(mXmppConnectionService, uri);
 527    }
 528
 529    private void copyFileToPrivateStorage(File file, Uri uri) throws FileCopyException {
 530        Log.d(Config.LOGTAG, "copy file (" + uri.toString() + ") to private storage " + file.getAbsolutePath());
 531        file.getParentFile().mkdirs();
 532        OutputStream os = null;
 533        InputStream is = null;
 534        try {
 535            file.createNewFile();
 536            os = new FileOutputStream(file);
 537            is = mXmppConnectionService.getContentResolver().openInputStream(uri);
 538            byte[] buffer = new byte[1024];
 539            int length;
 540            while ((length = is.read(buffer)) > 0) {
 541                try {
 542                    os.write(buffer, 0, length);
 543                } catch (IOException e) {
 544                    throw new FileWriterException();
 545                }
 546            }
 547            try {
 548                os.flush();
 549            } catch (IOException e) {
 550                throw new FileWriterException();
 551            }
 552        } catch (FileNotFoundException e) {
 553            throw new FileCopyException(R.string.error_file_not_found);
 554        } catch (FileWriterException e) {
 555            throw new FileCopyException(R.string.error_unable_to_create_temporary_file);
 556        } catch (IOException e) {
 557            e.printStackTrace();
 558            throw new FileCopyException(R.string.error_io_exception);
 559        } finally {
 560            close(os);
 561            close(is);
 562        }
 563    }
 564
 565    public void copyFileToPrivateStorage(Message message, Uri uri, String type) throws FileCopyException {
 566        String mime = type != null ? type : MimeUtils.guessMimeTypeFromUri(mXmppConnectionService, uri);
 567        Log.d(Config.LOGTAG, "copy " + uri.toString() + " to private storage (mime=" + mime + ")");
 568        String extension = MimeUtils.guessExtensionFromMimeType(mime);
 569        if (extension == null) {
 570            Log.d(Config.LOGTAG, "extension from mime type was null");
 571            extension = getExtensionFromUri(uri);
 572        }
 573        if ("ogg".equals(extension) && type != null && type.startsWith("audio/")) {
 574            extension = "oga";
 575        }
 576        message.setRelativeFilePath(message.getUuid() + "." + extension);
 577        copyFileToPrivateStorage(mXmppConnectionService.getFileBackend().getFile(message), uri);
 578    }
 579
 580    private String getExtensionFromUri(Uri uri) {
 581        String[] projection = {MediaStore.MediaColumns.DATA};
 582        String filename = null;
 583        Cursor cursor;
 584        try {
 585            cursor = mXmppConnectionService.getContentResolver().query(uri, projection, null, null, null);
 586        } catch (IllegalArgumentException e) {
 587            cursor = null;
 588        }
 589        if (cursor != null) {
 590            try {
 591                if (cursor.moveToFirst()) {
 592                    filename = cursor.getString(0);
 593                }
 594            } catch (Exception e) {
 595                filename = null;
 596            } finally {
 597                cursor.close();
 598            }
 599        }
 600        if (filename == null) {
 601            final List<String> segments = uri.getPathSegments();
 602            if (segments.size() > 0) {
 603                filename = segments.get(segments.size() - 1);
 604            }
 605        }
 606        int pos = filename == null ? -1 : filename.lastIndexOf('.');
 607        return pos > 0 ? filename.substring(pos + 1) : null;
 608    }
 609
 610    private void copyImageToPrivateStorage(File file, Uri image, int sampleSize) throws FileCopyException {
 611        file.getParentFile().mkdirs();
 612        InputStream is = null;
 613        OutputStream os = null;
 614        try {
 615            if (!file.exists() && !file.createNewFile()) {
 616                throw new FileCopyException(R.string.error_unable_to_create_temporary_file);
 617            }
 618            is = mXmppConnectionService.getContentResolver().openInputStream(image);
 619            if (is == null) {
 620                throw new FileCopyException(R.string.error_not_an_image_file);
 621            }
 622            Bitmap originalBitmap;
 623            BitmapFactory.Options options = new BitmapFactory.Options();
 624            int inSampleSize = (int) Math.pow(2, sampleSize);
 625            Log.d(Config.LOGTAG, "reading bitmap with sample size " + inSampleSize);
 626            options.inSampleSize = inSampleSize;
 627            originalBitmap = BitmapFactory.decodeStream(is, null, options);
 628            is.close();
 629            if (originalBitmap == null) {
 630                throw new FileCopyException(R.string.error_not_an_image_file);
 631            }
 632            Bitmap scaledBitmap = resize(originalBitmap, Config.IMAGE_SIZE);
 633            int rotation = getRotation(image);
 634            scaledBitmap = rotate(scaledBitmap, rotation);
 635            boolean targetSizeReached = false;
 636            int quality = Config.IMAGE_QUALITY;
 637            final int imageMaxSize = mXmppConnectionService.getResources().getInteger(R.integer.auto_accept_filesize);
 638            while (!targetSizeReached) {
 639                os = new FileOutputStream(file);
 640                boolean success = scaledBitmap.compress(Config.IMAGE_FORMAT, quality, os);
 641                if (!success) {
 642                    throw new FileCopyException(R.string.error_compressing_image);
 643                }
 644                os.flush();
 645                targetSizeReached = file.length() <= imageMaxSize || quality <= 50;
 646                quality -= 5;
 647            }
 648            scaledBitmap.recycle();
 649        } catch (FileNotFoundException e) {
 650            throw new FileCopyException(R.string.error_file_not_found);
 651        } catch (IOException e) {
 652            e.printStackTrace();
 653            throw new FileCopyException(R.string.error_io_exception);
 654        } catch (SecurityException e) {
 655            throw new FileCopyException(R.string.error_security_exception_during_image_copy);
 656        } catch (OutOfMemoryError e) {
 657            ++sampleSize;
 658            if (sampleSize <= 3) {
 659                copyImageToPrivateStorage(file, image, sampleSize);
 660            } else {
 661                throw new FileCopyException(R.string.error_out_of_memory);
 662            }
 663        } finally {
 664            close(os);
 665            close(is);
 666        }
 667    }
 668
 669    public void copyImageToPrivateStorage(File file, Uri image) throws FileCopyException {
 670        Log.d(Config.LOGTAG, "copy image (" + image.toString() + ") to private storage " + file.getAbsolutePath());
 671        copyImageToPrivateStorage(file, image, 0);
 672    }
 673
 674    public void copyImageToPrivateStorage(Message message, Uri image) throws FileCopyException {
 675        switch (Config.IMAGE_FORMAT) {
 676            case JPEG:
 677                message.setRelativeFilePath(message.getUuid() + ".jpg");
 678                break;
 679            case PNG:
 680                message.setRelativeFilePath(message.getUuid() + ".png");
 681                break;
 682            case WEBP:
 683                message.setRelativeFilePath(message.getUuid() + ".webp");
 684                break;
 685        }
 686        copyImageToPrivateStorage(getFile(message), image);
 687        updateFileParams(message);
 688    }
 689
 690    public boolean unusualBounds(Uri image) {
 691        try {
 692            BitmapFactory.Options options = new BitmapFactory.Options();
 693            options.inJustDecodeBounds = true;
 694            BitmapFactory.decodeStream(mXmppConnectionService.getContentResolver().openInputStream(image), null, options);
 695            float ratio = (float) options.outHeight / options.outWidth;
 696            return ratio > (21.0f / 9.0f) || ratio < (9.0f / 21.0f);
 697        } catch (Exception e) {
 698            return false;
 699        }
 700    }
 701
 702    private int getRotation(File file) {
 703        return getRotation(Uri.parse("file://" + file.getAbsolutePath()));
 704    }
 705
 706    private int getRotation(Uri image) {
 707        InputStream is = null;
 708        try {
 709            is = mXmppConnectionService.getContentResolver().openInputStream(image);
 710            return ExifHelper.getOrientation(is);
 711        } catch (FileNotFoundException e) {
 712            return 0;
 713        } finally {
 714            close(is);
 715        }
 716    }
 717
 718    public Bitmap getThumbnail(Message message, int size, boolean cacheOnly) throws IOException {
 719        final String uuid = message.getUuid();
 720        final LruCache<String, Bitmap> cache = mXmppConnectionService.getBitmapCache();
 721        Bitmap thumbnail = cache.get(uuid);
 722        if ((thumbnail == null) && (!cacheOnly)) {
 723            synchronized (THUMBNAIL_LOCK) {
 724                thumbnail = cache.get(uuid);
 725                if (thumbnail != null) {
 726                    return thumbnail;
 727                }
 728                DownloadableFile file = getFile(message);
 729                final String mime = file.getMimeType();
 730                if (mime.startsWith("video/")) {
 731                    thumbnail = getVideoPreview(file, size);
 732                } else {
 733                    Bitmap fullsize = getFullsizeImagePreview(file, size);
 734                    if (fullsize == null) {
 735                        throw new FileNotFoundException();
 736                    }
 737                    thumbnail = resize(fullsize, size);
 738                    thumbnail = rotate(thumbnail, getRotation(file));
 739                    if (mime.equals("image/gif")) {
 740                        Bitmap withGifOverlay = thumbnail.copy(Bitmap.Config.ARGB_8888, true);
 741                        drawOverlay(withGifOverlay, paintOverlayBlack(withGifOverlay) ? R.drawable.play_gif_black : R.drawable.play_gif_white, 1.0f);
 742                        thumbnail.recycle();
 743                        thumbnail = withGifOverlay;
 744                    }
 745                }
 746                cache.put(uuid, thumbnail);
 747            }
 748        }
 749        return thumbnail;
 750    }
 751
 752    private Bitmap getFullsizeImagePreview(File file, int size) {
 753        BitmapFactory.Options options = new BitmapFactory.Options();
 754        options.inSampleSize = calcSampleSize(file, size);
 755        try {
 756            return BitmapFactory.decodeFile(file.getAbsolutePath(), options);
 757        } catch (OutOfMemoryError e) {
 758            options.inSampleSize *= 2;
 759            return BitmapFactory.decodeFile(file.getAbsolutePath(), options);
 760        }
 761    }
 762
 763    private void drawOverlay(Bitmap bitmap, int resource, float factor) {
 764        Bitmap overlay = BitmapFactory.decodeResource(mXmppConnectionService.getResources(), resource);
 765        Canvas canvas = new Canvas(bitmap);
 766        float targetSize = Math.min(canvas.getWidth(), canvas.getHeight()) * factor;
 767        Log.d(Config.LOGTAG, "target size overlay: " + targetSize + " overlay bitmap size was " + overlay.getHeight());
 768        float left = (canvas.getWidth() - targetSize) / 2.0f;
 769        float top = (canvas.getHeight() - targetSize) / 2.0f;
 770        RectF dst = new RectF(left, top, left + targetSize - 1, top + targetSize - 1);
 771        canvas.drawBitmap(overlay, null, dst, createAntiAliasingPaint());
 772    }
 773
 774    /**
 775     * https://stackoverflow.com/a/3943023/210897
 776     */
 777    private boolean paintOverlayBlack(final Bitmap bitmap) {
 778        final int h = bitmap.getHeight();
 779        final int w = bitmap.getWidth();
 780        int record = 0;
 781        for (int y = Math.round(h * IGNORE_PADDING); y < h - Math.round(h * IGNORE_PADDING); ++y) {
 782            for (int x = Math.round(w * IGNORE_PADDING); x < w - Math.round(w * IGNORE_PADDING); ++x) {
 783                int pixel = bitmap.getPixel(x, y);
 784                if ((Color.red(pixel) * 0.299 + Color.green(pixel) * 0.587 + Color.blue(pixel) * 0.114) > 186) {
 785                    --record;
 786                } else {
 787                    ++record;
 788                }
 789            }
 790        }
 791        return record < 0;
 792    }
 793
 794    private Bitmap cropCenterSquareVideo(Uri uri, int size) {
 795        MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever();
 796        Bitmap frame;
 797        try {
 798            metadataRetriever.setDataSource(mXmppConnectionService, uri);
 799            frame = metadataRetriever.getFrameAtTime(0);
 800            metadataRetriever.release();
 801            return cropCenterSquare(frame, size);
 802        } catch (Exception e) {
 803            frame = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
 804            frame.eraseColor(0xff000000);
 805            return frame;
 806        }
 807    }
 808
 809    private Bitmap getVideoPreview(File file, int size) {
 810        MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever();
 811        Bitmap frame;
 812        try {
 813            metadataRetriever.setDataSource(file.getAbsolutePath());
 814            frame = metadataRetriever.getFrameAtTime(0);
 815            metadataRetriever.release();
 816            frame = resize(frame, size);
 817        } catch (IOException | RuntimeException e) {
 818            frame = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
 819            frame.eraseColor(0xff000000);
 820        }
 821        drawOverlay(frame, paintOverlayBlack(frame) ? R.drawable.play_video_black : R.drawable.play_video_white, 0.75f);
 822        return frame;
 823    }
 824
 825    public Uri getTakePhotoUri() {
 826        File file;
 827        if (Config.ONLY_INTERNAL_STORAGE) {
 828            file = new File(mXmppConnectionService.getCacheDir().getAbsolutePath(), "Camera/IMG_" + this.IMAGE_DATE_FORMAT.format(new Date()) + ".jpg");
 829        } else {
 830            file = new File(getTakePhotoPath() + "IMG_" + this.IMAGE_DATE_FORMAT.format(new Date()) + ".jpg");
 831        }
 832        file.getParentFile().mkdirs();
 833        return getUriForFile(mXmppConnectionService, file);
 834    }
 835
 836    public Avatar getPepAvatar(Uri image, int size, Bitmap.CompressFormat format) {
 837
 838        final Avatar uncompressAvatar = getUncompressedAvatar(image);
 839        if (uncompressAvatar != null && uncompressAvatar.image.length() <= Config.AVATAR_CHAR_LIMIT) {
 840            return uncompressAvatar;
 841        }
 842        if (uncompressAvatar != null) {
 843            Log.d(Config.LOGTAG, "uncompressed avatar exceeded char limit by " + (uncompressAvatar.image.length() - Config.AVATAR_CHAR_LIMIT));
 844        }
 845
 846        Bitmap bm = cropCenterSquare(image, size);
 847        if (bm == null) {
 848            return null;
 849        }
 850        if (hasAlpha(bm)) {
 851            Log.d(Config.LOGTAG, "alpha in avatar detected; uploading as PNG");
 852            bm.recycle();
 853            bm = cropCenterSquare(image, 96);
 854            return getPepAvatar(bm, Bitmap.CompressFormat.PNG, 100);
 855        }
 856        return getPepAvatar(bm, format, 100);
 857    }
 858
 859    private Avatar getUncompressedAvatar(Uri uri) {
 860        Bitmap bitmap = null;
 861        try {
 862            bitmap = BitmapFactory.decodeStream(mXmppConnectionService.getContentResolver().openInputStream(uri));
 863            return getPepAvatar(bitmap, Bitmap.CompressFormat.PNG, 100);
 864        } catch (Exception e) {
 865            return null;
 866        } finally {
 867            if (bitmap != null) {
 868                bitmap.recycle();
 869            }
 870        }
 871    }
 872
 873    private Avatar getPepAvatar(Bitmap bitmap, Bitmap.CompressFormat format, int quality) {
 874        try {
 875            ByteArrayOutputStream mByteArrayOutputStream = new ByteArrayOutputStream();
 876            Base64OutputStream mBase64OutputStream = new Base64OutputStream(mByteArrayOutputStream, Base64.DEFAULT);
 877            MessageDigest digest = MessageDigest.getInstance("SHA-1");
 878            DigestOutputStream mDigestOutputStream = new DigestOutputStream(mBase64OutputStream, digest);
 879            if (!bitmap.compress(format, quality, mDigestOutputStream)) {
 880                return null;
 881            }
 882            mDigestOutputStream.flush();
 883            mDigestOutputStream.close();
 884            long chars = mByteArrayOutputStream.size();
 885            if (format != Bitmap.CompressFormat.PNG && quality >= 50 && chars >= Config.AVATAR_CHAR_LIMIT) {
 886                int q = quality - 2;
 887                Log.d(Config.LOGTAG, "avatar char length was " + chars + " reducing quality to " + q);
 888                return getPepAvatar(bitmap, format, q);
 889            }
 890            Log.d(Config.LOGTAG, "settled on char length " + chars + " with quality=" + quality);
 891            final Avatar avatar = new Avatar();
 892            avatar.sha1sum = CryptoHelper.bytesToHex(digest.digest());
 893            avatar.image = new String(mByteArrayOutputStream.toByteArray());
 894            if (format.equals(Bitmap.CompressFormat.WEBP)) {
 895                avatar.type = "image/webp";
 896            } else if (format.equals(Bitmap.CompressFormat.JPEG)) {
 897                avatar.type = "image/jpeg";
 898            } else if (format.equals(Bitmap.CompressFormat.PNG)) {
 899                avatar.type = "image/png";
 900            }
 901            avatar.width = bitmap.getWidth();
 902            avatar.height = bitmap.getHeight();
 903            return avatar;
 904        } catch (OutOfMemoryError e) {
 905            Log.d(Config.LOGTAG,"unable to convert avatar to base64 due to low memory");
 906            return null;
 907        } catch (Exception e) {
 908            return null;
 909        }
 910    }
 911
 912    public Avatar getStoredPepAvatar(String hash) {
 913        if (hash == null) {
 914            return null;
 915        }
 916        Avatar avatar = new Avatar();
 917        File file = new File(getAvatarPath(hash));
 918        FileInputStream is = null;
 919        try {
 920            avatar.size = file.length();
 921            BitmapFactory.Options options = new BitmapFactory.Options();
 922            options.inJustDecodeBounds = true;
 923            BitmapFactory.decodeFile(file.getAbsolutePath(), options);
 924            is = new FileInputStream(file);
 925            ByteArrayOutputStream mByteArrayOutputStream = new ByteArrayOutputStream();
 926            Base64OutputStream mBase64OutputStream = new Base64OutputStream(mByteArrayOutputStream, Base64.DEFAULT);
 927            MessageDigest digest = MessageDigest.getInstance("SHA-1");
 928            DigestOutputStream os = new DigestOutputStream(mBase64OutputStream, digest);
 929            byte[] buffer = new byte[4096];
 930            int length;
 931            while ((length = is.read(buffer)) > 0) {
 932                os.write(buffer, 0, length);
 933            }
 934            os.flush();
 935            os.close();
 936            avatar.sha1sum = CryptoHelper.bytesToHex(digest.digest());
 937            avatar.image = new String(mByteArrayOutputStream.toByteArray());
 938            avatar.height = options.outHeight;
 939            avatar.width = options.outWidth;
 940            avatar.type = options.outMimeType;
 941            return avatar;
 942        } catch (NoSuchAlgorithmException | IOException e) {
 943            return null;
 944        } finally {
 945            close(is);
 946        }
 947    }
 948
 949    public boolean isAvatarCached(Avatar avatar) {
 950        File file = new File(getAvatarPath(avatar.getFilename()));
 951        return file.exists();
 952    }
 953
 954    public boolean save(final Avatar avatar) {
 955        File file;
 956        if (isAvatarCached(avatar)) {
 957            file = new File(getAvatarPath(avatar.getFilename()));
 958            avatar.size = file.length();
 959        } else {
 960            file = new File(mXmppConnectionService.getCacheDir().getAbsolutePath() + "/" + UUID.randomUUID().toString());
 961            if (file.getParentFile().mkdirs()) {
 962                Log.d(Config.LOGTAG, "created cache directory");
 963            }
 964            OutputStream os = null;
 965            try {
 966                if (!file.createNewFile()) {
 967                    Log.d(Config.LOGTAG, "unable to create temporary file " + file.getAbsolutePath());
 968                }
 969                os = new FileOutputStream(file);
 970                MessageDigest digest = MessageDigest.getInstance("SHA-1");
 971                digest.reset();
 972                DigestOutputStream mDigestOutputStream = new DigestOutputStream(os, digest);
 973                final byte[] bytes = avatar.getImageAsBytes();
 974                mDigestOutputStream.write(bytes);
 975                mDigestOutputStream.flush();
 976                mDigestOutputStream.close();
 977                String sha1sum = CryptoHelper.bytesToHex(digest.digest());
 978                if (sha1sum.equals(avatar.sha1sum)) {
 979                    File outputFile = new File(getAvatarPath(avatar.getFilename()));
 980                    if (outputFile.getParentFile().mkdirs()) {
 981                        Log.d(Config.LOGTAG, "created avatar directory");
 982                    }
 983                    String filename = getAvatarPath(avatar.getFilename());
 984                    if (!file.renameTo(new File(filename))) {
 985                        Log.d(Config.LOGTAG, "unable to rename " + file.getAbsolutePath() + " to " + outputFile);
 986                        return false;
 987                    }
 988                } else {
 989                    Log.d(Config.LOGTAG, "sha1sum mismatch for " + avatar.owner);
 990                    if (!file.delete()) {
 991                        Log.d(Config.LOGTAG, "unable to delete temporary file");
 992                    }
 993                    return false;
 994                }
 995                avatar.size = bytes.length;
 996            } catch (IllegalArgumentException | IOException | NoSuchAlgorithmException e) {
 997                return false;
 998            } finally {
 999                close(os);
1000            }
1001        }
1002        return true;
1003    }
1004
1005    private String getAvatarPath(String avatar) {
1006        return mXmppConnectionService.getFilesDir().getAbsolutePath() + "/avatars/" + avatar;
1007    }
1008
1009    public Uri getAvatarUri(String avatar) {
1010        return Uri.parse("file:" + getAvatarPath(avatar));
1011    }
1012
1013    public Bitmap cropCenterSquare(Uri image, int size) {
1014        if (image == null) {
1015            return null;
1016        }
1017        InputStream is = null;
1018        try {
1019            BitmapFactory.Options options = new BitmapFactory.Options();
1020            options.inSampleSize = calcSampleSize(image, size);
1021            is = mXmppConnectionService.getContentResolver().openInputStream(image);
1022            if (is == null) {
1023                return null;
1024            }
1025            Bitmap input = BitmapFactory.decodeStream(is, null, options);
1026            if (input == null) {
1027                return null;
1028            } else {
1029                input = rotate(input, getRotation(image));
1030                return cropCenterSquare(input, size);
1031            }
1032        } catch (FileNotFoundException | SecurityException e) {
1033            Log.d(Config.LOGTAG,"unable to open file "+image.toString(), e);
1034            return null;
1035        } finally {
1036            close(is);
1037        }
1038    }
1039
1040    public Bitmap cropCenter(Uri image, int newHeight, int newWidth) {
1041        if (image == null) {
1042            return null;
1043        }
1044        InputStream is = null;
1045        try {
1046            BitmapFactory.Options options = new BitmapFactory.Options();
1047            options.inSampleSize = calcSampleSize(image, Math.max(newHeight, newWidth));
1048            is = mXmppConnectionService.getContentResolver().openInputStream(image);
1049            if (is == null) {
1050                return null;
1051            }
1052            Bitmap source = BitmapFactory.decodeStream(is, null, options);
1053            if (source == null) {
1054                return null;
1055            }
1056            int sourceWidth = source.getWidth();
1057            int sourceHeight = source.getHeight();
1058            float xScale = (float) newWidth / sourceWidth;
1059            float yScale = (float) newHeight / sourceHeight;
1060            float scale = Math.max(xScale, yScale);
1061            float scaledWidth = scale * sourceWidth;
1062            float scaledHeight = scale * sourceHeight;
1063            float left = (newWidth - scaledWidth) / 2;
1064            float top = (newHeight - scaledHeight) / 2;
1065
1066            RectF targetRect = new RectF(left, top, left + scaledWidth, top + scaledHeight);
1067            Bitmap dest = Bitmap.createBitmap(newWidth, newHeight, Bitmap.Config.ARGB_8888);
1068            Canvas canvas = new Canvas(dest);
1069            canvas.drawBitmap(source, null, targetRect, createAntiAliasingPaint());
1070            if (source.isRecycled()) {
1071                source.recycle();
1072            }
1073            return dest;
1074        } catch (SecurityException e) {
1075            return null; //android 6.0 with revoked permissions for example
1076        } catch (FileNotFoundException e) {
1077            return null;
1078        } finally {
1079            close(is);
1080        }
1081    }
1082
1083    public Bitmap cropCenterSquare(Bitmap input, int size) {
1084        int w = input.getWidth();
1085        int h = input.getHeight();
1086
1087        float scale = Math.max((float) size / h, (float) size / w);
1088
1089        float outWidth = scale * w;
1090        float outHeight = scale * h;
1091        float left = (size - outWidth) / 2;
1092        float top = (size - outHeight) / 2;
1093        RectF target = new RectF(left, top, left + outWidth, top + outHeight);
1094
1095        Bitmap output = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
1096        Canvas canvas = new Canvas(output);
1097        canvas.drawBitmap(input, null, target, createAntiAliasingPaint());
1098        if (!input.isRecycled()) {
1099            input.recycle();
1100        }
1101        return output;
1102    }
1103
1104    private int calcSampleSize(Uri image, int size) throws FileNotFoundException, SecurityException {
1105        BitmapFactory.Options options = new BitmapFactory.Options();
1106        options.inJustDecodeBounds = true;
1107        BitmapFactory.decodeStream(mXmppConnectionService.getContentResolver().openInputStream(image), null, options);
1108        return calcSampleSize(options, size);
1109    }
1110
1111    public void updateFileParams(Message message) {
1112        updateFileParams(message, null);
1113    }
1114
1115    public void updateFileParams(Message message, URL url) {
1116        DownloadableFile file = getFile(message);
1117        final String mime = file.getMimeType();
1118        boolean image = message.getType() == Message.TYPE_IMAGE || (mime != null && mime.startsWith("image/"));
1119        boolean video = mime != null && mime.startsWith("video/");
1120        boolean audio = mime != null && mime.startsWith("audio/");
1121        final StringBuilder body = new StringBuilder();
1122        if (url != null) {
1123            body.append(url.toString());
1124        }
1125        body.append('|').append(file.getSize());
1126        if (image || video) {
1127            try {
1128                Dimensions dimensions = image ? getImageDimensions(file) : getVideoDimensions(file);
1129                if (dimensions.valid()) {
1130                    body.append('|').append(dimensions.width).append('|').append(dimensions.height);
1131                }
1132            } catch (NotAVideoFile notAVideoFile) {
1133                Log.d(Config.LOGTAG, "file with mime type " + file.getMimeType() + " was not a video file");
1134                //fall threw
1135            }
1136        } else if (audio) {
1137            body.append("|0|0|").append(getMediaRuntime(file));
1138        }
1139        message.setBody(body.toString());
1140    }
1141
1142    public int getMediaRuntime(Uri uri) {
1143        try {
1144            MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever();
1145            mediaMetadataRetriever.setDataSource(mXmppConnectionService, uri);
1146            return Integer.parseInt(mediaMetadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION));
1147        } catch (RuntimeException e) {
1148            return 0;
1149        }
1150    }
1151
1152    private int getMediaRuntime(File file) {
1153        try {
1154            MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever();
1155            mediaMetadataRetriever.setDataSource(file.toString());
1156            return Integer.parseInt(mediaMetadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION));
1157        } catch (RuntimeException e) {
1158            return 0;
1159        }
1160    }
1161
1162    private Dimensions getImageDimensions(File file) {
1163        BitmapFactory.Options options = new BitmapFactory.Options();
1164        options.inJustDecodeBounds = true;
1165        BitmapFactory.decodeFile(file.getAbsolutePath(), options);
1166        int rotation = getRotation(file);
1167        boolean rotated = rotation == 90 || rotation == 270;
1168        int imageHeight = rotated ? options.outWidth : options.outHeight;
1169        int imageWidth = rotated ? options.outHeight : options.outWidth;
1170        return new Dimensions(imageHeight, imageWidth);
1171    }
1172
1173    private Dimensions getVideoDimensions(File file) throws NotAVideoFile {
1174        MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever();
1175        try {
1176            metadataRetriever.setDataSource(file.getAbsolutePath());
1177        } catch (RuntimeException e) {
1178            throw new NotAVideoFile(e);
1179        }
1180        return getVideoDimensions(metadataRetriever);
1181    }
1182
1183    public Bitmap getAvatar(String avatar, int size) {
1184        if (avatar == null) {
1185            return null;
1186        }
1187        Bitmap bm = cropCenter(getAvatarUri(avatar), size, size);
1188        if (bm == null) {
1189            return null;
1190        }
1191        return bm;
1192    }
1193
1194    public boolean isFileAvailable(Message message) {
1195        return getFile(message).exists();
1196    }
1197
1198    private static class Dimensions {
1199        public final int width;
1200        public final int height;
1201
1202        Dimensions(int height, int width) {
1203            this.width = width;
1204            this.height = height;
1205        }
1206
1207        public int getMin() {
1208            return Math.min(width, height);
1209        }
1210
1211        public boolean valid() {
1212            return width > 0 && height > 0;
1213        }
1214    }
1215
1216    private static class NotAVideoFile extends Exception {
1217        public NotAVideoFile(Throwable t) {
1218            super(t);
1219        }
1220
1221        public NotAVideoFile() {
1222            super();
1223        }
1224    }
1225
1226    public class FileCopyException extends Exception {
1227        private static final long serialVersionUID = -1010013599132881427L;
1228        private int resId;
1229
1230        public FileCopyException(int resId) {
1231            this.resId = resId;
1232        }
1233
1234        public int getResId() {
1235            return resId;
1236        }
1237    }
1238}