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