1package eu.siacs.conversations.persistance;
   2
   3import android.content.ContentResolver;
   4import android.content.Context;
   5import android.content.res.Resources;
   6import android.database.Cursor;
   7import android.graphics.Bitmap;
   8import android.graphics.BitmapFactory;
   9import android.graphics.Canvas;
  10import android.graphics.Color;
  11import android.graphics.drawable.BitmapDrawable;
  12import android.graphics.drawable.Drawable;
  13import android.graphics.ImageDecoder;
  14import android.graphics.Matrix;
  15import android.graphics.Paint;
  16import android.graphics.Rect;
  17import android.graphics.RectF;
  18import android.graphics.pdf.PdfRenderer;
  19import android.media.MediaMetadataRetriever;
  20import android.media.MediaScannerConnection;
  21import android.net.Uri;
  22import android.os.Build;
  23import android.os.Environment;
  24import android.os.ParcelFileDescriptor;
  25import android.provider.MediaStore;
  26import android.provider.OpenableColumns;
  27import android.system.Os;
  28import android.system.StructStat;
  29import android.util.Base64;
  30import android.util.Base64OutputStream;
  31import android.util.DisplayMetrics;
  32import android.util.Log;
  33import android.util.LruCache;
  34
  35import androidx.annotation.RequiresApi;
  36import androidx.annotation.StringRes;
  37import androidx.core.content.FileProvider;
  38import androidx.exifinterface.media.ExifInterface;
  39
  40import com.google.common.base.Strings;
  41import com.google.common.collect.ImmutableList;
  42import com.google.common.io.ByteStreams;
  43
  44import com.wolt.blurhashkt.BlurHashDecoder;
  45
  46import java.io.ByteArrayOutputStream;
  47import java.io.Closeable;
  48import java.io.File;
  49import java.io.FileDescriptor;
  50import java.io.FileInputStream;
  51import java.io.FileNotFoundException;
  52import java.io.FileOutputStream;
  53import java.io.IOException;
  54import java.io.InputStream;
  55import java.io.OutputStream;
  56import java.net.ServerSocket;
  57import java.net.Socket;
  58import java.nio.ByteBuffer;
  59import java.security.DigestOutputStream;
  60import java.security.MessageDigest;
  61import java.security.NoSuchAlgorithmException;
  62import java.text.SimpleDateFormat;
  63import java.util.ArrayList;
  64import java.util.Arrays;
  65import java.util.Date;
  66import java.util.List;
  67import java.util.Locale;
  68import java.util.UUID;
  69
  70import io.ipfs.cid.Cid;
  71
  72import eu.siacs.conversations.Config;
  73import eu.siacs.conversations.R;
  74import eu.siacs.conversations.entities.DownloadableFile;
  75import eu.siacs.conversations.entities.Message;
  76import eu.siacs.conversations.services.AttachFileToConversationRunnable;
  77import eu.siacs.conversations.services.XmppConnectionService;
  78import eu.siacs.conversations.ui.adapter.MediaAdapter;
  79import eu.siacs.conversations.ui.util.Attachment;
  80import eu.siacs.conversations.utils.CryptoHelper;
  81import eu.siacs.conversations.utils.FileUtils;
  82import eu.siacs.conversations.utils.FileWriterException;
  83import eu.siacs.conversations.utils.MimeUtils;
  84import eu.siacs.conversations.xmpp.pep.Avatar;
  85import eu.siacs.conversations.xml.Element;
  86
  87public class FileBackend {
  88
  89    private static final Object THUMBNAIL_LOCK = new Object();
  90
  91    private static final SimpleDateFormat IMAGE_DATE_FORMAT =
  92            new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US);
  93
  94    private static final String FILE_PROVIDER = ".files";
  95    private static final float IGNORE_PADDING = 0.15f;
  96    private final XmppConnectionService mXmppConnectionService;
  97
  98    private static final List<String> STORAGE_TYPES;
  99
 100    static {
 101        final ImmutableList.Builder<String> builder =
 102                new ImmutableList.Builder<String>()
 103                        .add(
 104                                Environment.DIRECTORY_DOWNLOADS,
 105                                Environment.DIRECTORY_PICTURES,
 106                                Environment.DIRECTORY_MOVIES);
 107        if (Build.VERSION.SDK_INT >= 19) {
 108            builder.add(Environment.DIRECTORY_DOCUMENTS);
 109        }
 110        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
 111            builder.add(Environment.DIRECTORY_RECORDINGS);
 112        }
 113        STORAGE_TYPES = builder.build();
 114    }
 115
 116    public FileBackend(XmppConnectionService service) {
 117        this.mXmppConnectionService = service;
 118    }
 119
 120    public static long getFileSize(Context context, Uri uri) {
 121        try (final Cursor cursor =
 122                context.getContentResolver().query(uri, null, null, null, null)) {
 123            if (cursor != null && cursor.moveToFirst()) {
 124                final int index = cursor.getColumnIndex(OpenableColumns.SIZE);
 125                if (index == -1) {
 126                    return -1;
 127                }
 128                return cursor.getLong(index);
 129            }
 130            return -1;
 131        } catch (final Exception ignored) {
 132            return -1;
 133        }
 134    }
 135
 136    public static boolean allFilesUnderSize(
 137            Context context, List<Attachment> attachments, long max) {
 138        final boolean compressVideo =
 139                !AttachFileToConversationRunnable.getVideoCompression(context)
 140                        .equals("uncompressed");
 141        if (max <= 0) {
 142            Log.d(Config.LOGTAG, "server did not report max file size for http upload");
 143            return true; // exception to be compatible with HTTP Upload < v0.2
 144        }
 145        for (Attachment attachment : attachments) {
 146            if (attachment.getType() != Attachment.Type.FILE) {
 147                continue;
 148            }
 149            String mime = attachment.getMime();
 150            if (mime != null && mime.startsWith("video/") && compressVideo) {
 151                try {
 152                    Dimensions dimensions =
 153                            FileBackend.getVideoDimensions(context, attachment.getUri());
 154                    if (dimensions.getMin() > 720) {
 155                        Log.d(
 156                                Config.LOGTAG,
 157                                "do not consider video file with min width larger than 720 for size check");
 158                        continue;
 159                    }
 160                } catch (NotAVideoFile notAVideoFile) {
 161                    // ignore and fall through
 162                }
 163            }
 164            if (FileBackend.getFileSize(context, attachment.getUri()) > max) {
 165                Log.d(
 166                        Config.LOGTAG,
 167                        "not all files are under "
 168                                + max
 169                                + " bytes. suggesting falling back to jingle");
 170                return false;
 171            }
 172        }
 173        return true;
 174    }
 175
 176    public static File getBackupDirectory(final Context context) {
 177        final File conversationsDownloadDirectory =
 178                new File(
 179                        Environment.getExternalStoragePublicDirectory(
 180                                Environment.DIRECTORY_DOWNLOADS),
 181                        context.getString(R.string.app_name));
 182        return new File(conversationsDownloadDirectory, "Backup");
 183    }
 184
 185    public static File getLegacyBackupDirectory(final String app) {
 186        final File appDirectory = new File(Environment.getExternalStorageDirectory(), app);
 187        return new File(appDirectory, "Backup");
 188    }
 189
 190    private static Bitmap rotate(final Bitmap bitmap, final int degree) {
 191        if (degree == 0) {
 192            return bitmap;
 193        }
 194        final int w = bitmap.getWidth();
 195        final int h = bitmap.getHeight();
 196        final Matrix matrix = new Matrix();
 197        matrix.postRotate(degree);
 198        final Bitmap result = Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix, true);
 199        if (!bitmap.isRecycled()) {
 200            bitmap.recycle();
 201        }
 202        return result;
 203    }
 204
 205    public static boolean isPathBlacklisted(String path) {
 206        final String androidDataPath =
 207                Environment.getExternalStorageDirectory().getAbsolutePath() + "/Android/data/";
 208        return path.startsWith(androidDataPath);
 209    }
 210
 211    private static Paint createAntiAliasingPaint() {
 212        Paint paint = new Paint();
 213        paint.setAntiAlias(true);
 214        paint.setFilterBitmap(true);
 215        paint.setDither(true);
 216        return paint;
 217    }
 218
 219    public static Uri getUriForUri(Context context, Uri uri) {
 220        if ("file".equals(uri.getScheme())) {
 221            return getUriForFile(context, new File(uri.getPath()));
 222        } else {
 223            return uri;
 224        }
 225    }
 226
 227    public static Uri getUriForFile(Context context, File file) {
 228        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N || Config.ONLY_INTERNAL_STORAGE) {
 229            try {
 230                return FileProvider.getUriForFile(context, getAuthority(context), file);
 231            } catch (IllegalArgumentException e) {
 232                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
 233                    throw new SecurityException(e);
 234                } else {
 235                    return Uri.fromFile(file);
 236                }
 237            }
 238        } else {
 239            return Uri.fromFile(file);
 240        }
 241    }
 242
 243    public static String getAuthority(Context context) {
 244        return context.getPackageName() + FILE_PROVIDER;
 245    }
 246
 247    private static boolean hasAlpha(final Bitmap bitmap) {
 248        final int w = bitmap.getWidth();
 249        final int h = bitmap.getHeight();
 250        final int yStep = Math.max(1, w / 100);
 251        final int xStep = Math.max(1, h / 100);
 252        for (int x = 0; x < w; x += xStep) {
 253            for (int y = 0; y < h; y += yStep) {
 254                if (Color.alpha(bitmap.getPixel(x, y)) < 255) {
 255                    return true;
 256                }
 257            }
 258        }
 259        return false;
 260    }
 261
 262    private static int calcSampleSize(File image, int size) {
 263        BitmapFactory.Options options = new BitmapFactory.Options();
 264        options.inJustDecodeBounds = true;
 265        BitmapFactory.decodeFile(image.getAbsolutePath(), options);
 266        return calcSampleSize(options, size);
 267    }
 268
 269    private static int calcSampleSize(BitmapFactory.Options options, int size) {
 270        int height = options.outHeight;
 271        int width = options.outWidth;
 272        int inSampleSize = 1;
 273
 274        if (height > size || width > size) {
 275            int halfHeight = height / 2;
 276            int halfWidth = width / 2;
 277
 278            while ((halfHeight / inSampleSize) > size && (halfWidth / inSampleSize) > size) {
 279                inSampleSize *= 2;
 280            }
 281        }
 282        return inSampleSize;
 283    }
 284
 285    private static Dimensions getVideoDimensions(Context context, Uri uri) throws NotAVideoFile {
 286        MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever();
 287        try {
 288            mediaMetadataRetriever.setDataSource(context, uri);
 289        } catch (RuntimeException e) {
 290            throw new NotAVideoFile(e);
 291        }
 292        return getVideoDimensions(mediaMetadataRetriever);
 293    }
 294
 295    private static Dimensions getVideoDimensionsOfFrame(
 296            MediaMetadataRetriever mediaMetadataRetriever) {
 297        Bitmap bitmap = null;
 298        try {
 299            bitmap = mediaMetadataRetriever.getFrameAtTime();
 300            return new Dimensions(bitmap.getHeight(), bitmap.getWidth());
 301        } catch (Exception e) {
 302            return null;
 303        } finally {
 304            if (bitmap != null) {
 305                bitmap.recycle();
 306            }
 307        }
 308    }
 309
 310    private static Dimensions getVideoDimensions(MediaMetadataRetriever metadataRetriever)
 311            throws NotAVideoFile {
 312        String hasVideo =
 313                metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_HAS_VIDEO);
 314        if (hasVideo == null) {
 315            throw new NotAVideoFile();
 316        }
 317        Dimensions dimensions = getVideoDimensionsOfFrame(metadataRetriever);
 318        if (dimensions != null) {
 319            return dimensions;
 320        }
 321        final int rotation = extractRotationFromMediaRetriever(metadataRetriever);
 322        boolean rotated = rotation == 90 || rotation == 270;
 323        int height;
 324        try {
 325            String h =
 326                    metadataRetriever.extractMetadata(
 327                            MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT);
 328            height = Integer.parseInt(h);
 329        } catch (Exception e) {
 330            height = -1;
 331        }
 332        int width;
 333        try {
 334            String w =
 335                    metadataRetriever.extractMetadata(
 336                            MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH);
 337            width = Integer.parseInt(w);
 338        } catch (Exception e) {
 339            width = -1;
 340        }
 341        metadataRetriever.release();
 342        Log.d(Config.LOGTAG, "extracted video dims " + width + "x" + height);
 343        return rotated ? new Dimensions(width, height) : new Dimensions(height, width);
 344    }
 345
 346    private static int extractRotationFromMediaRetriever(MediaMetadataRetriever metadataRetriever) {
 347        String r =
 348                metadataRetriever.extractMetadata(
 349                        MediaMetadataRetriever.METADATA_KEY_VIDEO_ROTATION);
 350        try {
 351            return Integer.parseInt(r);
 352        } catch (Exception e) {
 353            return 0;
 354        }
 355    }
 356
 357    public static void close(final Closeable stream) {
 358        if (stream != null) {
 359            try {
 360                stream.close();
 361            } catch (Exception e) {
 362                Log.d(Config.LOGTAG, "unable to close stream", e);
 363            }
 364        }
 365    }
 366
 367    public static void close(final Socket socket) {
 368        if (socket != null) {
 369            try {
 370                socket.close();
 371            } catch (IOException e) {
 372                Log.d(Config.LOGTAG, "unable to close socket", e);
 373            }
 374        }
 375    }
 376
 377    public static void close(final ServerSocket socket) {
 378        if (socket != null) {
 379            try {
 380                socket.close();
 381            } catch (IOException e) {
 382                Log.d(Config.LOGTAG, "unable to close server socket", e);
 383            }
 384        }
 385    }
 386
 387    public static boolean weOwnFile(final Uri uri) {
 388        if (uri == null || !ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
 389            return false;
 390        } else {
 391            return weOwnFileLollipop(uri);
 392        }
 393    }
 394
 395    private static boolean weOwnFileLollipop(final Uri uri) {
 396        final String path = uri.getPath();
 397        if (path == null) {
 398            return false;
 399        }
 400        try {
 401            File file = new File(path);
 402            FileDescriptor fd =
 403                    ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY)
 404                            .getFileDescriptor();
 405            StructStat st = Os.fstat(fd);
 406            return st.st_uid == android.os.Process.myUid();
 407        } catch (FileNotFoundException e) {
 408            return false;
 409        } catch (Exception e) {
 410            return true;
 411        }
 412    }
 413
 414    public static Uri getMediaUri(Context context, File file) {
 415        final String filePath = file.getAbsolutePath();
 416        try (final Cursor cursor =
 417                context.getContentResolver()
 418                        .query(
 419                                MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
 420                                new String[] {MediaStore.Images.Media._ID},
 421                                MediaStore.Images.Media.DATA + "=? ",
 422                                new String[] {filePath},
 423                                null)) {
 424            if (cursor != null && cursor.moveToFirst()) {
 425                final int id =
 426                        cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.MediaColumns._ID));
 427                return Uri.withAppendedPath(
 428                        MediaStore.Images.Media.EXTERNAL_CONTENT_URI, String.valueOf(id));
 429            } else {
 430                return null;
 431            }
 432        } catch (final Exception e) {
 433            return null;
 434        }
 435    }
 436
 437    public static void updateFileParams(Message message, String url, long size) {
 438        Message.FileParams fileParams = new Message.FileParams();
 439        fileParams.url = url;
 440        fileParams.size = size;
 441        message.setFileParams(fileParams);
 442    }
 443
 444    public Bitmap getPreviewForUri(Attachment attachment, int size, boolean cacheOnly) {
 445        final String key = "attachment_" + attachment.getUuid().toString() + "_" + size;
 446        final LruCache<String, Bitmap> cache = mXmppConnectionService.getBitmapCache();
 447        Bitmap bitmap = cache.get(key);
 448        if (bitmap != null || cacheOnly) {
 449            return bitmap;
 450        }
 451        final String mime = attachment.getMime();
 452        if ("application/pdf".equals(mime)) {
 453            bitmap = cropCenterSquarePdf(attachment.getUri(), size);
 454            drawOverlay(
 455                    bitmap,
 456                    paintOverlayBlackPdf(bitmap)
 457                            ? R.drawable.open_pdf_black
 458                            : R.drawable.open_pdf_white,
 459                    0.75f);
 460        } else if (mime != null && mime.startsWith("video/")) {
 461            bitmap = cropCenterSquareVideo(attachment.getUri(), size);
 462            drawOverlay(
 463                    bitmap,
 464                    paintOverlayBlack(bitmap)
 465                            ? R.drawable.play_video_black
 466                            : R.drawable.play_video_white,
 467                    0.75f);
 468        } else {
 469            bitmap = cropCenterSquare(attachment.getUri(), size);
 470            if (bitmap != null && "image/gif".equals(mime)) {
 471                Bitmap withGifOverlay = bitmap.copy(Bitmap.Config.ARGB_8888, true);
 472                drawOverlay(
 473                        withGifOverlay,
 474                        paintOverlayBlack(withGifOverlay)
 475                                ? R.drawable.play_gif_black
 476                                : R.drawable.play_gif_white,
 477                        1.0f);
 478                bitmap.recycle();
 479                bitmap = withGifOverlay;
 480            }
 481        }
 482        if (bitmap != null) {
 483            cache.put(key, bitmap);
 484        }
 485        return bitmap;
 486    }
 487
 488    public void updateMediaScanner(File file) {
 489        updateMediaScanner(file, null);
 490    }
 491
 492    public void updateMediaScanner(File file, final Runnable callback) {
 493        MediaScannerConnection.scanFile(
 494                mXmppConnectionService,
 495                new String[] {file.getAbsolutePath()},
 496                null,
 497                new MediaScannerConnection.MediaScannerConnectionClient() {
 498                    @Override
 499                    public void onMediaScannerConnected() {}
 500
 501                    @Override
 502                    public void onScanCompleted(String path, Uri uri) {
 503                        if (callback != null && file.getAbsolutePath().equals(path)) {
 504                            callback.run();
 505                        } else {
 506                            Log.d(Config.LOGTAG, "media scanner scanned wrong file");
 507                            if (callback != null) {
 508                                callback.run();
 509                            }
 510                        }
 511                    }
 512                });
 513    }
 514
 515    public boolean deleteFile(Message message) {
 516        File file = getFile(message);
 517        if (file.delete()) {
 518            updateMediaScanner(file);
 519            return true;
 520        } else {
 521            return false;
 522        }
 523    }
 524
 525    public DownloadableFile getFile(Message message) {
 526        return getFile(message, true);
 527    }
 528
 529    public DownloadableFile getFileForPath(String path) {
 530        return getFileForPath(
 531                path,
 532                MimeUtils.guessMimeTypeFromExtension(MimeUtils.extractRelevantExtension(path)));
 533    }
 534
 535    private DownloadableFile getFileForPath(final String path, final String mime) {
 536        if (path.startsWith("/")) {
 537            return new DownloadableFile(path);
 538        } else {
 539            return getLegacyFileForFilename(path, mime);
 540        }
 541    }
 542
 543    public DownloadableFile getLegacyFileForFilename(final String filename, final String mime) {
 544        if (Strings.isNullOrEmpty(mime)) {
 545            return new DownloadableFile(getLegacyStorageLocation("Files"), filename);
 546        } else if (mime.startsWith("image/")) {
 547            return new DownloadableFile(getLegacyStorageLocation("Images"), filename);
 548        } else if (mime.startsWith("video/")) {
 549            return new DownloadableFile(getLegacyStorageLocation("Videos"), filename);
 550        } else {
 551            return new DownloadableFile(getLegacyStorageLocation("Files"), filename);
 552        }
 553    }
 554
 555    public boolean isInternalFile(final File file) {
 556        final File internalFile = getFileForPath(file.getName());
 557        return file.getAbsolutePath().equals(internalFile.getAbsolutePath());
 558    }
 559
 560    public DownloadableFile getFile(Message message, boolean decrypted) {
 561        final boolean encrypted =
 562                !decrypted
 563                        && (message.getEncryption() == Message.ENCRYPTION_PGP
 564                                || message.getEncryption() == Message.ENCRYPTION_DECRYPTED);
 565        String path = message.getRelativeFilePath();
 566        if (path == null) {
 567            path = message.getUuid();
 568        }
 569        final DownloadableFile file = getFileForPath(path, message.getMimeType());
 570        if (encrypted) {
 571            return new DownloadableFile(
 572                    mXmppConnectionService.getCacheDir(),
 573                    String.format("%s.%s", file.getName(), "pgp"));
 574        } else {
 575            return file;
 576        }
 577    }
 578
 579    public List<Attachment> convertToAttachments(List<DatabaseBackend.FilePath> relativeFilePaths) {
 580        final List<Attachment> attachments = new ArrayList<>();
 581        for (final DatabaseBackend.FilePath relativeFilePath : relativeFilePaths) {
 582            final String mime =
 583                    MimeUtils.guessMimeTypeFromExtension(
 584                            MimeUtils.extractRelevantExtension(relativeFilePath.path));
 585            final File file = getFileForPath(relativeFilePath.path, mime);
 586            attachments.add(Attachment.of(relativeFilePath.uuid, file, mime));
 587        }
 588        return attachments;
 589    }
 590
 591    private File getLegacyStorageLocation(final String type) {
 592        if (Config.ONLY_INTERNAL_STORAGE) {
 593            return new File(mXmppConnectionService.getFilesDir(), type);
 594        } else {
 595            final File appDirectory =
 596                    new File(
 597                            Environment.getExternalStorageDirectory(),
 598                            mXmppConnectionService.getString(R.string.app_name));
 599            final File appMediaDirectory = new File(appDirectory, "Media");
 600            final String locationName =
 601                    String.format(
 602                            "%s %s", mXmppConnectionService.getString(R.string.app_name), type);
 603            return new File(appMediaDirectory, locationName);
 604        }
 605    }
 606
 607    private Bitmap resize(final Bitmap originalBitmap, int size) throws IOException {
 608        int w = originalBitmap.getWidth();
 609        int h = originalBitmap.getHeight();
 610        if (w <= 0 || h <= 0) {
 611            throw new IOException("Decoded bitmap reported bounds smaller 0");
 612        } else if (Math.max(w, h) > size) {
 613            int scalledW;
 614            int scalledH;
 615            if (w <= h) {
 616                scalledW = Math.max((int) (w / ((double) h / size)), 1);
 617                scalledH = size;
 618            } else {
 619                scalledW = size;
 620                scalledH = Math.max((int) (h / ((double) w / size)), 1);
 621            }
 622            final Bitmap result =
 623                    Bitmap.createScaledBitmap(originalBitmap, scalledW, scalledH, true);
 624            if (!originalBitmap.isRecycled()) {
 625                originalBitmap.recycle();
 626            }
 627            return result;
 628        } else {
 629            return originalBitmap;
 630        }
 631    }
 632
 633    public boolean useImageAsIs(final Uri uri) {
 634        final String path = getOriginalPath(uri);
 635        if (path == null || isPathBlacklisted(path)) {
 636            return false;
 637        }
 638        final File file = new File(path);
 639        long size = file.length();
 640        if (size == 0
 641                || size
 642                        >= mXmppConnectionService
 643                                .getResources()
 644                                .getInteger(R.integer.auto_accept_filesize)) {
 645            return false;
 646        }
 647        BitmapFactory.Options options = new BitmapFactory.Options();
 648        options.inJustDecodeBounds = true;
 649        try {
 650            final InputStream inputStream =
 651                    mXmppConnectionService.getContentResolver().openInputStream(uri);
 652            BitmapFactory.decodeStream(inputStream, null, options);
 653            close(inputStream);
 654            if (options.outMimeType == null || options.outHeight <= 0 || options.outWidth <= 0) {
 655                return false;
 656            }
 657            return (options.outWidth <= Config.IMAGE_SIZE
 658                    && options.outHeight <= Config.IMAGE_SIZE
 659                    && options.outMimeType.contains(Config.IMAGE_FORMAT.name().toLowerCase()));
 660        } catch (FileNotFoundException e) {
 661            Log.d(Config.LOGTAG, "unable to get image dimensions", e);
 662            return false;
 663        }
 664    }
 665
 666    public String getOriginalPath(Uri uri) {
 667        return FileUtils.getPath(mXmppConnectionService, uri);
 668    }
 669
 670    private void copyFileToPrivateStorage(File file, Uri uri) throws FileCopyException {
 671        Log.d(
 672                Config.LOGTAG,
 673                "copy file (" + uri.toString() + ") to private storage " + file.getAbsolutePath());
 674        file.getParentFile().mkdirs();
 675        try {
 676            file.createNewFile();
 677        } catch (IOException e) {
 678            throw new FileCopyException(R.string.error_unable_to_create_temporary_file);
 679        }
 680        try (final OutputStream os = new FileOutputStream(file);
 681                final InputStream is =
 682                        mXmppConnectionService.getContentResolver().openInputStream(uri)) {
 683            if (is == null) {
 684                throw new FileCopyException(R.string.error_file_not_found);
 685            }
 686            try {
 687                ByteStreams.copy(is, os);
 688            } catch (IOException e) {
 689                throw new FileWriterException(file);
 690            }
 691            try {
 692                os.flush();
 693            } catch (IOException e) {
 694                throw new FileWriterException(file);
 695            }
 696        } catch (final FileNotFoundException e) {
 697            cleanup(file);
 698            throw new FileCopyException(R.string.error_file_not_found);
 699        } catch (final FileWriterException e) {
 700            cleanup(file);
 701            throw new FileCopyException(R.string.error_unable_to_create_temporary_file);
 702        } catch (final SecurityException | IllegalStateException e) {
 703            cleanup(file);
 704            throw new FileCopyException(R.string.error_security_exception);
 705        } catch (final IOException e) {
 706            cleanup(file);
 707            throw new FileCopyException(R.string.error_io_exception);
 708        }
 709    }
 710
 711    public void copyFileToPrivateStorage(Message message, Uri uri, String type)
 712            throws FileCopyException {
 713        String mime = MimeUtils.guessMimeTypeFromUriAndMime(mXmppConnectionService, uri, type);
 714        Log.d(Config.LOGTAG, "copy " + uri.toString() + " to private storage (mime=" + mime + ")");
 715        String extension = MimeUtils.guessExtensionFromMimeType(mime);
 716        if (extension == null) {
 717            Log.d(Config.LOGTAG, "extension from mime type was null");
 718            extension = getExtensionFromUri(uri);
 719        }
 720        if ("ogg".equals(extension) && type != null && type.startsWith("audio/")) {
 721            extension = "oga";
 722        }
 723
 724        setupRelativeFilePath(message, uri, extension);
 725        copyFileToPrivateStorage(mXmppConnectionService.getFileBackend().getFile(message), uri);
 726    }
 727
 728    private String getExtensionFromUri(final Uri uri) {
 729        final String[] projection = {MediaStore.MediaColumns.DATA};
 730        String filename = null;
 731        try (final Cursor cursor =
 732                mXmppConnectionService
 733                        .getContentResolver()
 734                        .query(uri, projection, null, null, null)) {
 735            if (cursor != null && cursor.moveToFirst()) {
 736                filename = cursor.getString(0);
 737            }
 738        } catch (final Exception e) {
 739            filename = null;
 740        }
 741        if (filename == null) {
 742            final List<String> segments = uri.getPathSegments();
 743            if (segments.size() > 0) {
 744                filename = segments.get(segments.size() - 1);
 745            }
 746        }
 747        final int pos = filename == null ? -1 : filename.lastIndexOf('.');
 748        return pos > 0 ? filename.substring(pos + 1) : null;
 749    }
 750
 751    private void copyImageToPrivateStorage(File file, Uri image, int sampleSize)
 752            throws FileCopyException, ImageCompressionException {
 753        final File parent = file.getParentFile();
 754        if (parent != null && parent.mkdirs()) {
 755            Log.d(Config.LOGTAG, "created parent directory");
 756        }
 757        InputStream is = null;
 758        OutputStream os = null;
 759        try {
 760            if (!file.exists() && !file.createNewFile()) {
 761                throw new FileCopyException(R.string.error_unable_to_create_temporary_file);
 762            }
 763            is = mXmppConnectionService.getContentResolver().openInputStream(image);
 764            if (is == null) {
 765                throw new FileCopyException(R.string.error_not_an_image_file);
 766            }
 767            final Bitmap originalBitmap;
 768            final BitmapFactory.Options options = new BitmapFactory.Options();
 769            final int inSampleSize = (int) Math.pow(2, sampleSize);
 770            Log.d(Config.LOGTAG, "reading bitmap with sample size " + inSampleSize);
 771            options.inSampleSize = inSampleSize;
 772            originalBitmap = BitmapFactory.decodeStream(is, null, options);
 773            is.close();
 774            if (originalBitmap == null) {
 775                throw new ImageCompressionException("Source file was not an image");
 776            }
 777            if (!"image/jpeg".equals(options.outMimeType) && hasAlpha(originalBitmap)) {
 778                originalBitmap.recycle();
 779                throw new ImageCompressionException("Source file had alpha channel");
 780            }
 781            Bitmap scaledBitmap = resize(originalBitmap, Config.IMAGE_SIZE);
 782            final int rotation = getRotation(image);
 783            scaledBitmap = rotate(scaledBitmap, rotation);
 784            boolean targetSizeReached = false;
 785            int quality = Config.IMAGE_QUALITY;
 786            final int imageMaxSize =
 787                    mXmppConnectionService
 788                            .getResources()
 789                            .getInteger(R.integer.auto_accept_filesize);
 790            while (!targetSizeReached) {
 791                os = new FileOutputStream(file);
 792                Log.d(Config.LOGTAG, "compressing image with quality " + quality);
 793                boolean success = scaledBitmap.compress(Config.IMAGE_FORMAT, quality, os);
 794                if (!success) {
 795                    throw new FileCopyException(R.string.error_compressing_image);
 796                }
 797                os.flush();
 798                final long fileSize = file.length();
 799                Log.d(Config.LOGTAG, "achieved file size of " + fileSize);
 800                targetSizeReached = fileSize <= imageMaxSize || quality <= 50;
 801                quality -= 5;
 802            }
 803            scaledBitmap.recycle();
 804        } catch (final FileNotFoundException e) {
 805            cleanup(file);
 806            throw new FileCopyException(R.string.error_file_not_found);
 807        } catch (final IOException e) {
 808            cleanup(file);
 809            throw new FileCopyException(R.string.error_io_exception);
 810        } catch (SecurityException e) {
 811            cleanup(file);
 812            throw new FileCopyException(R.string.error_security_exception_during_image_copy);
 813        } catch (final OutOfMemoryError e) {
 814            ++sampleSize;
 815            if (sampleSize <= 3) {
 816                copyImageToPrivateStorage(file, image, sampleSize);
 817            } else {
 818                throw new FileCopyException(R.string.error_out_of_memory);
 819            }
 820        } finally {
 821            close(os);
 822            close(is);
 823        }
 824    }
 825
 826    private static void cleanup(final File file) {
 827        try {
 828            file.delete();
 829        } catch (Exception e) {
 830
 831        }
 832    }
 833
 834    public void copyImageToPrivateStorage(File file, Uri image)
 835            throws FileCopyException, ImageCompressionException {
 836        Log.d(
 837                Config.LOGTAG,
 838                "copy image ("
 839                        + image.toString()
 840                        + ") to private storage "
 841                        + file.getAbsolutePath());
 842        copyImageToPrivateStorage(file, image, 0);
 843    }
 844
 845    public void copyImageToPrivateStorage(Message message, Uri image)
 846            throws FileCopyException, ImageCompressionException {
 847        final String filename;
 848        switch (Config.IMAGE_FORMAT) {
 849            case JPEG:
 850                filename = String.format("%s.%s", message.getUuid(), "jpg");
 851                break;
 852            case PNG:
 853                filename = String.format("%s.%s", message.getUuid(), "png");
 854                break;
 855            case WEBP:
 856                filename = String.format("%s.%s", message.getUuid(), "webp");
 857                break;
 858            default:
 859                throw new IllegalStateException("Unknown image format");
 860        }
 861        setupRelativeFilePath(message, filename);
 862        final File tmp = getFile(message);
 863        copyImageToPrivateStorage(tmp, image);
 864        final String extension = MimeUtils.extractRelevantExtension(filename);
 865        try {
 866            setupRelativeFilePath(message, new FileInputStream(tmp), extension);
 867        } catch (final FileNotFoundException e) {
 868            throw new FileCopyException(R.string.error_file_not_found);
 869        } catch (final IOException e) {
 870            throw new FileCopyException(R.string.error_io_exception);
 871        }
 872        tmp.renameTo(getFile(message));
 873        updateFileParams(message, null, false);
 874    }
 875
 876    public void setupRelativeFilePath(final Message message, final Uri uri, final String extension) throws FileCopyException {
 877        try {
 878            setupRelativeFilePath(message, mXmppConnectionService.getContentResolver().openInputStream(uri), extension);
 879        } catch (final FileNotFoundException e) {
 880            throw new FileCopyException(R.string.error_file_not_found);
 881        } catch (final IOException e) {
 882            throw new FileCopyException(R.string.error_io_exception);
 883        }
 884    }
 885
 886    public Cid[] calculateCids(final InputStream is) throws IOException {
 887        try {
 888            return CryptoHelper.cid(is, new String[]{"SHA-256", "SHA-1", "SHA-512"});
 889        } catch (final NoSuchAlgorithmException e) {
 890            throw new AssertionError(e);
 891        }
 892    }
 893
 894    public void setupRelativeFilePath(final Message message, final InputStream is, final String extension) throws IOException {
 895        message.setRelativeFilePath(getStorageLocation(is, extension).getAbsolutePath());
 896    }
 897
 898    public void setupRelativeFilePath(final Message message, final String filename) {
 899        final String extension = MimeUtils.extractRelevantExtension(filename);
 900        final String mime = MimeUtils.guessMimeTypeFromExtension(extension);
 901        setupRelativeFilePath(message, filename, mime);
 902    }
 903
 904    public File getStorageLocation(final InputStream is, final String extension) throws IOException {
 905        final String mime = MimeUtils.guessMimeTypeFromExtension(extension);
 906        Cid[] cids = calculateCids(is);
 907
 908        File file = getStorageLocation(String.format("%s.%s", cids[0], extension), mime);
 909        for (int i = 0; i < cids.length; i++) {
 910            mXmppConnectionService.saveCid(cids[i], file);
 911        }
 912        return file;
 913    }
 914
 915    public File getStorageLocation(final String filename, final String mime) {
 916        final File parentDirectory;
 917        if (Strings.isNullOrEmpty(mime)) {
 918            parentDirectory =
 919                    Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
 920        } else if (mime.startsWith("image/")) {
 921            parentDirectory =
 922                    Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
 923        } else if (mime.startsWith("video/")) {
 924            parentDirectory =
 925                    Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES);
 926        } else if (MediaAdapter.DOCUMENT_MIMES.contains(mime)) {
 927            parentDirectory =
 928                    Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS);
 929        } else {
 930            parentDirectory =
 931                    Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
 932        }
 933        final File appDirectory =
 934                new File(parentDirectory, mXmppConnectionService.getString(R.string.app_name));
 935        return new File(appDirectory, filename);
 936    }
 937
 938    public static boolean inConversationsDirectory(final Context context, String path) {
 939        final File fileDirectory = new File(path).getParentFile();
 940        for (final String type : STORAGE_TYPES) {
 941            final File typeDirectory =
 942                    new File(
 943                            Environment.getExternalStoragePublicDirectory(type),
 944                            context.getString(R.string.app_name));
 945            if (typeDirectory.equals(fileDirectory)) {
 946                return true;
 947            }
 948        }
 949        return false;
 950    }
 951
 952    public void setupRelativeFilePath(
 953            final Message message, final String filename, final String mime) {
 954        final File file = getStorageLocation(filename, mime);
 955        message.setRelativeFilePath(file.getAbsolutePath());
 956    }
 957
 958    public boolean unusualBounds(final Uri image) {
 959        try {
 960            final BitmapFactory.Options options = new BitmapFactory.Options();
 961            options.inJustDecodeBounds = true;
 962            final InputStream inputStream =
 963                    mXmppConnectionService.getContentResolver().openInputStream(image);
 964            BitmapFactory.decodeStream(inputStream, null, options);
 965            close(inputStream);
 966            float ratio = (float) options.outHeight / options.outWidth;
 967            return ratio > (21.0f / 9.0f) || ratio < (9.0f / 21.0f);
 968        } catch (final Exception e) {
 969            Log.w(Config.LOGTAG, "unable to detect image bounds", e);
 970            return false;
 971        }
 972    }
 973
 974    private int getRotation(final File file) {
 975        try (final InputStream inputStream = new FileInputStream(file)) {
 976            return getRotation(inputStream);
 977        } catch (Exception e) {
 978            return 0;
 979        }
 980    }
 981
 982    private int getRotation(final Uri image) {
 983        try (final InputStream is =
 984                mXmppConnectionService.getContentResolver().openInputStream(image)) {
 985            return is == null ? 0 : getRotation(is);
 986        } catch (final Exception e) {
 987            return 0;
 988        }
 989    }
 990
 991    private static int getRotation(final InputStream inputStream) throws IOException {
 992        final ExifInterface exif = new ExifInterface(inputStream);
 993        final int orientation =
 994                exif.getAttributeInt(
 995                        ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED);
 996        switch (orientation) {
 997            case ExifInterface.ORIENTATION_ROTATE_180:
 998                return 180;
 999            case ExifInterface.ORIENTATION_ROTATE_90:
1000                return 90;
1001            case ExifInterface.ORIENTATION_ROTATE_270:
1002                return 270;
1003            default:
1004                return 0;
1005        }
1006    }
1007
1008    public BitmapDrawable getFallbackThumbnail(final Message message, int size) {
1009        List<Element> thumbs = message.getFileParams() != null ? message.getFileParams().getThumbnails() : null;
1010        if (thumbs != null && !thumbs.isEmpty()) {
1011            for (Element thumb : thumbs) {
1012                Uri uri = Uri.parse(thumb.getAttribute("uri"));
1013                if (uri.getScheme().equals("data")) {
1014                    String[] parts = uri.getSchemeSpecificPart().split(",", 2);
1015                    if (parts[0].equals("image/blurhash")) {
1016                        final LruCache<String, Drawable> cache = mXmppConnectionService.getDrawableCache();
1017                        BitmapDrawable cached = (BitmapDrawable) cache.get(parts[1]);
1018                        if (cached != null) return cached;
1019
1020                        int width = message.getFileParams().width;
1021                        if (width < 1 && thumb.getAttribute("width") != null) width = Integer.parseInt(thumb.getAttribute("width"));
1022                        if (width < 1) width = 1920;
1023
1024                        int height = message.getFileParams().height;
1025                        if (height < 1 && thumb.getAttribute("height") != null) height = Integer.parseInt(thumb.getAttribute("height"));
1026                        if (height < 1) height = 1080;
1027                        Rect r = rectForSize(width, height, size);
1028
1029                        Bitmap blurhash = BlurHashDecoder.INSTANCE.decode(parts[1], r.width(), r.height(), 1.0f, false);
1030                        if (blurhash != null) {
1031                            cached = new BitmapDrawable(blurhash);
1032                            cache.put(parts[1], cached);
1033                            return cached;
1034                        }
1035                    }
1036                }
1037            }
1038         }
1039
1040        return null;
1041    }
1042
1043    public Drawable getThumbnail(Message message, Resources res, int size, boolean cacheOnly) throws IOException {
1044        final LruCache<String, Drawable> cache = mXmppConnectionService.getDrawableCache();
1045        DownloadableFile file = getFile(message);
1046        Drawable thumbnail = cache.get(file.getAbsolutePath());
1047        if (thumbnail != null) return thumbnail;
1048
1049        if ((thumbnail == null) && (!cacheOnly)) {
1050            synchronized (THUMBNAIL_LOCK) {
1051                List<Element> thumbs = message.getFileParams() != null ? message.getFileParams().getThumbnails() : null;
1052                if (thumbs != null && !thumbs.isEmpty()) {
1053                    for (Element thumb : thumbs) {
1054                        Uri uri = Uri.parse(thumb.getAttribute("uri"));
1055                        if (uri.getScheme().equals("data")) {
1056                            if (android.os.Build.VERSION.SDK_INT < 28) continue;
1057                            String[] parts = uri.getSchemeSpecificPart().split(",", 2);
1058                            byte[] data;
1059                            if (Arrays.asList(parts[0].split(";")).contains("base64")) {
1060                                data = Base64.decode(parts[1], 0);
1061                            } else {
1062                                data = parts[1].getBytes("UTF-8");
1063                            }
1064
1065                            ImageDecoder.Source source = ImageDecoder.createSource(ByteBuffer.wrap(data));
1066                            thumbnail = ImageDecoder.decodeDrawable(source, (decoder, info, src) -> {
1067                                int w = info.getSize().getWidth();
1068                                int h = info.getSize().getHeight();
1069                                Rect r = rectForSize(w, h, size);
1070                                decoder.setTargetSize(r.width(), r.height());
1071                            });
1072
1073                            if (thumbnail != null) {
1074                                cache.put(file.getAbsolutePath(), thumbnail);
1075                                return thumbnail;
1076                            }
1077                        }
1078                    }
1079                }
1080            }
1081        }
1082
1083        return getThumbnail(file, res, size, cacheOnly);
1084    }
1085
1086    public Drawable getThumbnail(DownloadableFile file, Resources res, int size, boolean cacheOnly) throws IOException {
1087        final LruCache<String, Drawable> cache = mXmppConnectionService.getDrawableCache();
1088        Drawable thumbnail = cache.get(file.getAbsolutePath());
1089        if ((thumbnail == null) && (!cacheOnly)) {
1090            synchronized (THUMBNAIL_LOCK) {
1091                thumbnail = cache.get(file.getAbsolutePath());
1092                if (thumbnail != null) {
1093                    return thumbnail;
1094                }
1095                final String mime = file.getMimeType();
1096                if ("application/pdf".equals(mime)) {
1097                    thumbnail = new BitmapDrawable(res, getPdfDocumentPreview(file, size));
1098                } else if (mime.startsWith("video/")) {
1099                    thumbnail = new BitmapDrawable(res, getVideoPreview(file, size));
1100                } else {
1101                    thumbnail = getImagePreview(file, res, size, mime);
1102                    if (thumbnail == null) {
1103                        throw new FileNotFoundException();
1104                    }
1105                }
1106                cache.put(file.getAbsolutePath(), thumbnail);
1107            }
1108        }
1109        return thumbnail;
1110    }
1111
1112    public Bitmap getThumbnailBitmap(Message message, Resources res, int size) throws IOException {
1113          final Drawable drawable = getThumbnail(message, res, size, false);
1114          if (drawable == null) return null;
1115          return drawDrawable(drawable);
1116    }
1117
1118    public static Rect rectForSize(int w, int h, int size) {
1119        int scalledW;
1120        int scalledH;
1121        if (w <= h) {
1122            scalledW = Math.max((int) (w / ((double) h / size)), 1);
1123            scalledH = size;
1124        } else {
1125            scalledW = size;
1126            scalledH = Math.max((int) (h / ((double) w / size)), 1);
1127        }
1128
1129        if (scalledW > w || scalledH > h) return new Rect(0, 0, w, h);
1130
1131        return new Rect(0, 0, scalledW, scalledH);
1132    }
1133
1134    private Drawable getImagePreview(File file, Resources res, int size, final String mime) throws IOException {
1135        if (android.os.Build.VERSION.SDK_INT >= 28) {
1136            ImageDecoder.Source source = ImageDecoder.createSource(file);
1137            return ImageDecoder.decodeDrawable(source, (decoder, info, src) -> {
1138                int w = info.getSize().getWidth();
1139                int h = info.getSize().getHeight();
1140                Rect r = rectForSize(w, h, size);
1141                decoder.setTargetSize(r.width(), r.height());
1142            });
1143        } else {
1144            BitmapFactory.Options options = new BitmapFactory.Options();
1145            options.inSampleSize = calcSampleSize(file, size);
1146            Bitmap bitmap = null;
1147            try {
1148                bitmap = BitmapFactory.decodeFile(file.getAbsolutePath(), options);
1149            } catch (OutOfMemoryError e) {
1150                options.inSampleSize *= 2;
1151                bitmap = BitmapFactory.decodeFile(file.getAbsolutePath(), options);
1152            }
1153            if (bitmap == null) return null;
1154
1155            bitmap = resize(bitmap, size);
1156            bitmap = rotate(bitmap, getRotation(file));
1157            if (mime.equals("image/gif")) {
1158                Bitmap withGifOverlay = bitmap.copy(Bitmap.Config.ARGB_8888, true);
1159                drawOverlay(withGifOverlay, paintOverlayBlack(withGifOverlay) ? R.drawable.play_gif_black : R.drawable.play_gif_white, 1.0f);
1160                bitmap.recycle();
1161                bitmap = withGifOverlay;
1162            }
1163            return new BitmapDrawable(res, bitmap);
1164        }
1165    }
1166
1167    protected Bitmap drawDrawable(Drawable drawable) {
1168        Bitmap bitmap = null;
1169
1170        if (drawable instanceof BitmapDrawable) {
1171            bitmap = ((BitmapDrawable) drawable).getBitmap();
1172            if (bitmap != null) return bitmap;
1173        }
1174
1175        bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
1176        Canvas canvas = new Canvas(bitmap);
1177        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
1178        drawable.draw(canvas);
1179        return bitmap;
1180    }
1181
1182    private void drawOverlay(Bitmap bitmap, int resource, float factor) {
1183        Bitmap overlay =
1184                BitmapFactory.decodeResource(mXmppConnectionService.getResources(), resource);
1185        Canvas canvas = new Canvas(bitmap);
1186        float targetSize = Math.min(canvas.getWidth(), canvas.getHeight()) * factor;
1187        Log.d(
1188                Config.LOGTAG,
1189                "target size overlay: "
1190                        + targetSize
1191                        + " overlay bitmap size was "
1192                        + overlay.getHeight());
1193        float left = (canvas.getWidth() - targetSize) / 2.0f;
1194        float top = (canvas.getHeight() - targetSize) / 2.0f;
1195        RectF dst = new RectF(left, top, left + targetSize - 1, top + targetSize - 1);
1196        canvas.drawBitmap(overlay, null, dst, createAntiAliasingPaint());
1197    }
1198
1199    /** https://stackoverflow.com/a/3943023/210897 */
1200    private boolean paintOverlayBlack(final Bitmap bitmap) {
1201        final int h = bitmap.getHeight();
1202        final int w = bitmap.getWidth();
1203        int record = 0;
1204        for (int y = Math.round(h * IGNORE_PADDING); y < h - Math.round(h * IGNORE_PADDING); ++y) {
1205            for (int x = Math.round(w * IGNORE_PADDING);
1206                    x < w - Math.round(w * IGNORE_PADDING);
1207                    ++x) {
1208                int pixel = bitmap.getPixel(x, y);
1209                if ((Color.red(pixel) * 0.299
1210                                + Color.green(pixel) * 0.587
1211                                + Color.blue(pixel) * 0.114)
1212                        > 186) {
1213                    --record;
1214                } else {
1215                    ++record;
1216                }
1217            }
1218        }
1219        return record < 0;
1220    }
1221
1222    private boolean paintOverlayBlackPdf(final Bitmap bitmap) {
1223        final int h = bitmap.getHeight();
1224        final int w = bitmap.getWidth();
1225        int white = 0;
1226        for (int y = 0; y < h; ++y) {
1227            for (int x = 0; x < w; ++x) {
1228                int pixel = bitmap.getPixel(x, y);
1229                if ((Color.red(pixel) * 0.299
1230                                + Color.green(pixel) * 0.587
1231                                + Color.blue(pixel) * 0.114)
1232                        > 186) {
1233                    white++;
1234                }
1235            }
1236        }
1237        return white > (h * w * 0.4f);
1238    }
1239
1240    private Bitmap cropCenterSquareVideo(Uri uri, int size) {
1241        MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever();
1242        Bitmap frame;
1243        try {
1244            metadataRetriever.setDataSource(mXmppConnectionService, uri);
1245            frame = metadataRetriever.getFrameAtTime(0);
1246            metadataRetriever.release();
1247            return cropCenterSquare(frame, size);
1248        } catch (Exception e) {
1249            frame = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
1250            frame.eraseColor(0xff000000);
1251            return frame;
1252        }
1253    }
1254
1255    private Bitmap getVideoPreview(final File file, final int size) {
1256        final MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever();
1257        Bitmap frame;
1258        try {
1259            metadataRetriever.setDataSource(file.getAbsolutePath());
1260            frame = metadataRetriever.getFrameAtTime(0);
1261            metadataRetriever.release();
1262            frame = resize(frame, size);
1263        } catch (IOException | RuntimeException e) {
1264            frame = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
1265            frame.eraseColor(0xff000000);
1266        }
1267        drawOverlay(
1268                frame,
1269                paintOverlayBlack(frame)
1270                        ? R.drawable.play_video_black
1271                        : R.drawable.play_video_white,
1272                0.75f);
1273        return frame;
1274    }
1275
1276    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
1277    private Bitmap getPdfDocumentPreview(final File file, final int size) {
1278        try {
1279            final ParcelFileDescriptor fileDescriptor =
1280                    ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
1281            final Bitmap rendered = renderPdfDocument(fileDescriptor, size, true);
1282            drawOverlay(
1283                    rendered,
1284                    paintOverlayBlackPdf(rendered)
1285                            ? R.drawable.open_pdf_black
1286                            : R.drawable.open_pdf_white,
1287                    0.75f);
1288            return rendered;
1289        } catch (final IOException | SecurityException e) {
1290            Log.d(Config.LOGTAG, "unable to render PDF document preview", e);
1291            final Bitmap placeholder = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
1292            placeholder.eraseColor(0xff000000);
1293            return placeholder;
1294        }
1295    }
1296
1297    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
1298    private Bitmap cropCenterSquarePdf(final Uri uri, final int size) {
1299        try {
1300            ParcelFileDescriptor fileDescriptor =
1301                    mXmppConnectionService.getContentResolver().openFileDescriptor(uri, "r");
1302            final Bitmap bitmap = renderPdfDocument(fileDescriptor, size, false);
1303            return cropCenterSquare(bitmap, size);
1304        } catch (Exception e) {
1305            final Bitmap placeholder = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
1306            placeholder.eraseColor(0xff000000);
1307            return placeholder;
1308        }
1309    }
1310
1311    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
1312    private Bitmap renderPdfDocument(
1313            ParcelFileDescriptor fileDescriptor, int targetSize, boolean fit) throws IOException {
1314        final PdfRenderer pdfRenderer = new PdfRenderer(fileDescriptor);
1315        final PdfRenderer.Page page = pdfRenderer.openPage(0);
1316        final Dimensions dimensions =
1317                scalePdfDimensions(
1318                        new Dimensions(page.getHeight(), page.getWidth()), targetSize, fit);
1319        final Bitmap rendered =
1320                Bitmap.createBitmap(dimensions.width, dimensions.height, Bitmap.Config.ARGB_8888);
1321        rendered.eraseColor(0xffffffff);
1322        page.render(rendered, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY);
1323        page.close();
1324        pdfRenderer.close();
1325        fileDescriptor.close();
1326        return rendered;
1327    }
1328
1329    public Uri getTakePhotoUri() {
1330        final String filename =
1331                String.format("IMG_%s.%s", IMAGE_DATE_FORMAT.format(new Date()), "jpg");
1332        final File directory;
1333        if (Config.ONLY_INTERNAL_STORAGE) {
1334            directory = new File(mXmppConnectionService.getCacheDir(), "Camera");
1335        } else {
1336            directory =
1337                    new File(
1338                            Environment.getExternalStoragePublicDirectory(
1339                                    Environment.DIRECTORY_DCIM),
1340                            "Camera");
1341        }
1342        final File file = new File(directory, filename);
1343        file.getParentFile().mkdirs();
1344        return getUriForFile(mXmppConnectionService, file);
1345    }
1346
1347    public Avatar getPepAvatar(Uri image, int size, Bitmap.CompressFormat format) {
1348
1349        final Avatar uncompressAvatar = getUncompressedAvatar(image);
1350        if (uncompressAvatar != null
1351                && uncompressAvatar.image.length() <= Config.AVATAR_CHAR_LIMIT) {
1352            return uncompressAvatar;
1353        }
1354        if (uncompressAvatar != null) {
1355            Log.d(
1356                    Config.LOGTAG,
1357                    "uncompressed avatar exceeded char limit by "
1358                            + (uncompressAvatar.image.length() - Config.AVATAR_CHAR_LIMIT));
1359        }
1360
1361        Bitmap bm = cropCenterSquare(image, size);
1362        if (bm == null) {
1363            return null;
1364        }
1365        if (hasAlpha(bm)) {
1366            Log.d(Config.LOGTAG, "alpha in avatar detected; uploading as PNG");
1367            bm.recycle();
1368            bm = cropCenterSquare(image, 96);
1369            return getPepAvatar(bm, Bitmap.CompressFormat.PNG, 100);
1370        }
1371        return getPepAvatar(bm, format, 100);
1372    }
1373
1374    private Avatar getUncompressedAvatar(Uri uri) {
1375        Bitmap bitmap = null;
1376        try {
1377            bitmap =
1378                    BitmapFactory.decodeStream(
1379                            mXmppConnectionService.getContentResolver().openInputStream(uri));
1380            return getPepAvatar(bitmap, Bitmap.CompressFormat.PNG, 100);
1381        } catch (Exception e) {
1382            return null;
1383        } finally {
1384            if (bitmap != null) {
1385                bitmap.recycle();
1386            }
1387        }
1388    }
1389
1390    private Avatar getPepAvatar(Bitmap bitmap, Bitmap.CompressFormat format, int quality) {
1391        try {
1392            ByteArrayOutputStream mByteArrayOutputStream = new ByteArrayOutputStream();
1393            Base64OutputStream mBase64OutputStream =
1394                    new Base64OutputStream(mByteArrayOutputStream, Base64.DEFAULT);
1395            MessageDigest digest = MessageDigest.getInstance("SHA-1");
1396            DigestOutputStream mDigestOutputStream =
1397                    new DigestOutputStream(mBase64OutputStream, digest);
1398            if (!bitmap.compress(format, quality, mDigestOutputStream)) {
1399                return null;
1400            }
1401            mDigestOutputStream.flush();
1402            mDigestOutputStream.close();
1403            long chars = mByteArrayOutputStream.size();
1404            if (format != Bitmap.CompressFormat.PNG
1405                    && quality >= 50
1406                    && chars >= Config.AVATAR_CHAR_LIMIT) {
1407                int q = quality - 2;
1408                Log.d(
1409                        Config.LOGTAG,
1410                        "avatar char length was " + chars + " reducing quality to " + q);
1411                return getPepAvatar(bitmap, format, q);
1412            }
1413            Log.d(Config.LOGTAG, "settled on char length " + chars + " with quality=" + quality);
1414            final Avatar avatar = new Avatar();
1415            avatar.sha1sum = CryptoHelper.bytesToHex(digest.digest());
1416            avatar.image = new String(mByteArrayOutputStream.toByteArray());
1417            if (format.equals(Bitmap.CompressFormat.WEBP)) {
1418                avatar.type = "image/webp";
1419            } else if (format.equals(Bitmap.CompressFormat.JPEG)) {
1420                avatar.type = "image/jpeg";
1421            } else if (format.equals(Bitmap.CompressFormat.PNG)) {
1422                avatar.type = "image/png";
1423            }
1424            avatar.width = bitmap.getWidth();
1425            avatar.height = bitmap.getHeight();
1426            return avatar;
1427        } catch (OutOfMemoryError e) {
1428            Log.d(Config.LOGTAG, "unable to convert avatar to base64 due to low memory");
1429            return null;
1430        } catch (Exception e) {
1431            return null;
1432        }
1433    }
1434
1435    public Avatar getStoredPepAvatar(String hash) {
1436        if (hash == null) {
1437            return null;
1438        }
1439        Avatar avatar = new Avatar();
1440        final File file = getAvatarFile(hash);
1441        FileInputStream is = null;
1442        try {
1443            avatar.size = file.length();
1444            BitmapFactory.Options options = new BitmapFactory.Options();
1445            options.inJustDecodeBounds = true;
1446            BitmapFactory.decodeFile(file.getAbsolutePath(), options);
1447            is = new FileInputStream(file);
1448            ByteArrayOutputStream mByteArrayOutputStream = new ByteArrayOutputStream();
1449            Base64OutputStream mBase64OutputStream =
1450                    new Base64OutputStream(mByteArrayOutputStream, Base64.DEFAULT);
1451            MessageDigest digest = MessageDigest.getInstance("SHA-1");
1452            DigestOutputStream os = new DigestOutputStream(mBase64OutputStream, digest);
1453            byte[] buffer = new byte[4096];
1454            int length;
1455            while ((length = is.read(buffer)) > 0) {
1456                os.write(buffer, 0, length);
1457            }
1458            os.flush();
1459            os.close();
1460            avatar.sha1sum = CryptoHelper.bytesToHex(digest.digest());
1461            avatar.image = new String(mByteArrayOutputStream.toByteArray());
1462            avatar.height = options.outHeight;
1463            avatar.width = options.outWidth;
1464            avatar.type = options.outMimeType;
1465            return avatar;
1466        } catch (NoSuchAlgorithmException | IOException e) {
1467            return null;
1468        } finally {
1469            close(is);
1470        }
1471    }
1472
1473    public boolean isAvatarCached(Avatar avatar) {
1474        final File file = getAvatarFile(avatar.getFilename());
1475        return file.exists();
1476    }
1477
1478    public boolean save(final Avatar avatar) {
1479        File file;
1480        if (isAvatarCached(avatar)) {
1481            file = getAvatarFile(avatar.getFilename());
1482            avatar.size = file.length();
1483        } else {
1484            file =
1485                    new File(
1486                            mXmppConnectionService.getCacheDir().getAbsolutePath()
1487                                    + "/"
1488                                    + UUID.randomUUID().toString());
1489            if (file.getParentFile().mkdirs()) {
1490                Log.d(Config.LOGTAG, "created cache directory");
1491            }
1492            OutputStream os = null;
1493            try {
1494                if (!file.createNewFile()) {
1495                    Log.d(
1496                            Config.LOGTAG,
1497                            "unable to create temporary file " + file.getAbsolutePath());
1498                }
1499                os = new FileOutputStream(file);
1500                MessageDigest digest = MessageDigest.getInstance("SHA-1");
1501                digest.reset();
1502                DigestOutputStream mDigestOutputStream = new DigestOutputStream(os, digest);
1503                final byte[] bytes = avatar.getImageAsBytes();
1504                mDigestOutputStream.write(bytes);
1505                mDigestOutputStream.flush();
1506                mDigestOutputStream.close();
1507                String sha1sum = CryptoHelper.bytesToHex(digest.digest());
1508                if (sha1sum.equals(avatar.sha1sum)) {
1509                    final File outputFile = getAvatarFile(avatar.getFilename());
1510                    if (outputFile.getParentFile().mkdirs()) {
1511                        Log.d(Config.LOGTAG, "created avatar directory");
1512                    }
1513                    final File avatarFile = getAvatarFile(avatar.getFilename());
1514                    if (!file.renameTo(avatarFile)) {
1515                        Log.d(
1516                                Config.LOGTAG,
1517                                "unable to rename " + file.getAbsolutePath() + " to " + outputFile);
1518                        return false;
1519                    }
1520                } else {
1521                    Log.d(Config.LOGTAG, "sha1sum mismatch for " + avatar.owner);
1522                    if (!file.delete()) {
1523                        Log.d(Config.LOGTAG, "unable to delete temporary file");
1524                    }
1525                    return false;
1526                }
1527                avatar.size = bytes.length;
1528            } catch (IllegalArgumentException | IOException | NoSuchAlgorithmException e) {
1529                return false;
1530            } finally {
1531                close(os);
1532            }
1533        }
1534        return true;
1535    }
1536
1537    public void deleteHistoricAvatarPath() {
1538        delete(getHistoricAvatarPath());
1539    }
1540
1541    private void delete(final File file) {
1542        if (file.isDirectory()) {
1543            final File[] files = file.listFiles();
1544            if (files != null) {
1545                for (final File f : files) {
1546                    delete(f);
1547                }
1548            }
1549        }
1550        if (file.delete()) {
1551            Log.d(Config.LOGTAG, "deleted " + file.getAbsolutePath());
1552        }
1553    }
1554
1555    private File getHistoricAvatarPath() {
1556        return new File(mXmppConnectionService.getFilesDir(), "/avatars/");
1557    }
1558
1559    private File getAvatarFile(String avatar) {
1560        return new File(mXmppConnectionService.getCacheDir(), "/avatars/" + avatar);
1561    }
1562
1563    public Uri getAvatarUri(String avatar) {
1564        return Uri.fromFile(getAvatarFile(avatar));
1565    }
1566
1567    public Bitmap cropCenterSquare(Uri image, int size) {
1568        if (image == null) {
1569            return null;
1570        }
1571        InputStream is = null;
1572        try {
1573            BitmapFactory.Options options = new BitmapFactory.Options();
1574            options.inSampleSize = calcSampleSize(image, size);
1575            is = mXmppConnectionService.getContentResolver().openInputStream(image);
1576            if (is == null) {
1577                return null;
1578            }
1579            Bitmap input = BitmapFactory.decodeStream(is, null, options);
1580            if (input == null) {
1581                return null;
1582            } else {
1583                input = rotate(input, getRotation(image));
1584                return cropCenterSquare(input, size);
1585            }
1586        } catch (FileNotFoundException | SecurityException e) {
1587            Log.d(Config.LOGTAG, "unable to open file " + image.toString(), e);
1588            return null;
1589        } finally {
1590            close(is);
1591        }
1592    }
1593
1594    public Bitmap cropCenter(Uri image, int newHeight, int newWidth) {
1595        if (image == null) {
1596            return null;
1597        }
1598        InputStream is = null;
1599        try {
1600            BitmapFactory.Options options = new BitmapFactory.Options();
1601            options.inSampleSize = calcSampleSize(image, Math.max(newHeight, newWidth));
1602            is = mXmppConnectionService.getContentResolver().openInputStream(image);
1603            if (is == null) {
1604                return null;
1605            }
1606            Bitmap source = BitmapFactory.decodeStream(is, null, options);
1607            if (source == null) {
1608                return null;
1609            }
1610            int sourceWidth = source.getWidth();
1611            int sourceHeight = source.getHeight();
1612            float xScale = (float) newWidth / sourceWidth;
1613            float yScale = (float) newHeight / sourceHeight;
1614            float scale = Math.max(xScale, yScale);
1615            float scaledWidth = scale * sourceWidth;
1616            float scaledHeight = scale * sourceHeight;
1617            float left = (newWidth - scaledWidth) / 2;
1618            float top = (newHeight - scaledHeight) / 2;
1619
1620            RectF targetRect = new RectF(left, top, left + scaledWidth, top + scaledHeight);
1621            Bitmap dest = Bitmap.createBitmap(newWidth, newHeight, Bitmap.Config.ARGB_8888);
1622            Canvas canvas = new Canvas(dest);
1623            canvas.drawBitmap(source, null, targetRect, createAntiAliasingPaint());
1624            if (source.isRecycled()) {
1625                source.recycle();
1626            }
1627            return dest;
1628        } catch (SecurityException e) {
1629            return null; // android 6.0 with revoked permissions for example
1630        } catch (FileNotFoundException e) {
1631            return null;
1632        } finally {
1633            close(is);
1634        }
1635    }
1636
1637    public Bitmap cropCenterSquare(Bitmap input, int size) {
1638        int w = input.getWidth();
1639        int h = input.getHeight();
1640
1641        float scale = Math.max((float) size / h, (float) size / w);
1642
1643        float outWidth = scale * w;
1644        float outHeight = scale * h;
1645        float left = (size - outWidth) / 2;
1646        float top = (size - outHeight) / 2;
1647        RectF target = new RectF(left, top, left + outWidth, top + outHeight);
1648
1649        Bitmap output = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
1650        Canvas canvas = new Canvas(output);
1651        canvas.drawBitmap(input, null, target, createAntiAliasingPaint());
1652        if (!input.isRecycled()) {
1653            input.recycle();
1654        }
1655        return output;
1656    }
1657
1658    private int calcSampleSize(Uri image, int size)
1659            throws FileNotFoundException, SecurityException {
1660        final BitmapFactory.Options options = new BitmapFactory.Options();
1661        options.inJustDecodeBounds = true;
1662        final InputStream inputStream =
1663                mXmppConnectionService.getContentResolver().openInputStream(image);
1664        BitmapFactory.decodeStream(inputStream, null, options);
1665        close(inputStream);
1666        return calcSampleSize(options, size);
1667    }
1668
1669    public void updateFileParams(Message message) {
1670        updateFileParams(message, null);
1671    }
1672
1673    public void updateFileParams(final Message message, final String url) {
1674        updateFileParams(message, url, true);
1675    }
1676
1677    public void updateFileParams(final Message message, final String url, boolean updateCids) {
1678        final boolean encrypted =
1679                message.getEncryption() == Message.ENCRYPTION_PGP
1680                        || message.getEncryption() == Message.ENCRYPTION_DECRYPTED;
1681        final DownloadableFile file = getFile(message);
1682        final String mime = file.getMimeType();
1683        final boolean privateMessage = message.isPrivateMessage();
1684        final boolean image =
1685                message.getType() == Message.TYPE_IMAGE
1686                        || (mime != null && mime.startsWith("image/"));
1687        Message.FileParams fileParams = new Message.FileParams();
1688        if (url != null) {
1689            fileParams.url = url;
1690        }
1691        if (encrypted && !file.exists()) {
1692            Log.d(Config.LOGTAG, "skipping updateFileParams because file is encrypted");
1693            final DownloadableFile encryptedFile = getFile(message, false);
1694            fileParams.size = encryptedFile.getSize();
1695        } else {
1696            Log.d(Config.LOGTAG, "running updateFileParams");
1697            final boolean ambiguous = MimeUtils.AMBIGUOUS_CONTAINER_FORMATS.contains(mime);
1698            final boolean video = mime != null && mime.startsWith("video/");
1699            final boolean audio = mime != null && mime.startsWith("audio/");
1700            final boolean pdf = "application/pdf".equals(mime);
1701            fileParams.size = file.getSize();
1702            if (ambiguous) {
1703                try {
1704                    final Dimensions dimensions = getVideoDimensions(file);
1705                    if (dimensions.valid()) {
1706                        Log.d(Config.LOGTAG, "ambiguous file " + mime + " is video");
1707                        fileParams.width = dimensions.width;
1708                        fileParams.height = dimensions.height;
1709                    } else {
1710                        Log.d(Config.LOGTAG, "ambiguous file " + mime + " is audio");
1711                        fileParams.runtime = getMediaRuntime(file);
1712                    }
1713                } catch (final NotAVideoFile e) {
1714                    Log.d(Config.LOGTAG, "ambiguous file " + mime + " is audio");
1715                    fileParams.runtime = getMediaRuntime(file);
1716                }
1717            } else if (image || video || pdf) {
1718                try {
1719                    final Dimensions dimensions;
1720                    if (video) {
1721                        dimensions = getVideoDimensions(file);
1722                    } else if (pdf) {
1723                        dimensions = getPdfDocumentDimensions(file);
1724                    } else {
1725                        dimensions = getImageDimensions(file);
1726                    }
1727                    if (dimensions.valid()) {
1728                        fileParams.width = dimensions.width;
1729                        fileParams.height = dimensions.height;
1730                    }
1731                } catch (NotAVideoFile notAVideoFile) {
1732                    Log.d(
1733                            Config.LOGTAG,
1734                            "file with mime type " + file.getMimeType() + " was not a video file");
1735                    // fall threw
1736                }
1737            } else if (audio) {
1738                fileParams.runtime = getMediaRuntime(file);
1739            }
1740        }
1741        message.setFileParams(fileParams);
1742        message.setDeleted(false);
1743        message.setType(
1744                privateMessage
1745                        ? Message.TYPE_PRIVATE_FILE
1746                        : (image ? Message.TYPE_IMAGE : Message.TYPE_FILE));
1747
1748        if (updateCids) {
1749            try {
1750                Cid[] cids = calculateCids(new FileInputStream(getFile(message)));
1751                for (int i = 0; i < cids.length; i++) {
1752                    mXmppConnectionService.saveCid(cids[i], file);
1753                }
1754            } catch (final IOException e) { }
1755        }
1756    }
1757
1758    private int getMediaRuntime(final File file) {
1759        try {
1760            final MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever();
1761            mediaMetadataRetriever.setDataSource(file.toString());
1762            final String value =
1763                    mediaMetadataRetriever.extractMetadata(
1764                            MediaMetadataRetriever.METADATA_KEY_DURATION);
1765            if (Strings.isNullOrEmpty(value)) {
1766                return 0;
1767            }
1768            return Integer.parseInt(value);
1769        } catch (final Exception e) {
1770            return 0;
1771        }
1772    }
1773
1774    private Dimensions getImageDimensions(File file) {
1775        final BitmapFactory.Options options = new BitmapFactory.Options();
1776        options.inJustDecodeBounds = true;
1777        BitmapFactory.decodeFile(file.getAbsolutePath(), options);
1778        final int rotation = getRotation(file);
1779        final boolean rotated = rotation == 90 || rotation == 270;
1780        final int imageHeight = rotated ? options.outWidth : options.outHeight;
1781        final int imageWidth = rotated ? options.outHeight : options.outWidth;
1782        return new Dimensions(imageHeight, imageWidth);
1783    }
1784
1785    private Dimensions getVideoDimensions(File file) throws NotAVideoFile {
1786        MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever();
1787        try {
1788            metadataRetriever.setDataSource(file.getAbsolutePath());
1789        } catch (RuntimeException e) {
1790            throw new NotAVideoFile(e);
1791        }
1792        return getVideoDimensions(metadataRetriever);
1793    }
1794
1795    private Dimensions getPdfDocumentDimensions(final File file) {
1796        final ParcelFileDescriptor fileDescriptor;
1797        try {
1798            fileDescriptor = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
1799            if (fileDescriptor == null) {
1800                return new Dimensions(0, 0);
1801            }
1802        } catch (final FileNotFoundException e) {
1803            return new Dimensions(0, 0);
1804        }
1805        try {
1806            final PdfRenderer pdfRenderer = new PdfRenderer(fileDescriptor);
1807            final PdfRenderer.Page page = pdfRenderer.openPage(0);
1808            final int height = page.getHeight();
1809            final int width = page.getWidth();
1810            page.close();
1811            pdfRenderer.close();
1812            return scalePdfDimensions(new Dimensions(height, width));
1813        } catch (final IOException | SecurityException e) {
1814            Log.d(Config.LOGTAG, "unable to get dimensions for pdf document", e);
1815            return new Dimensions(0, 0);
1816        }
1817    }
1818
1819    private Dimensions scalePdfDimensions(Dimensions in) {
1820        final DisplayMetrics displayMetrics =
1821                mXmppConnectionService.getResources().getDisplayMetrics();
1822        final int target = (int) (displayMetrics.density * 288);
1823        return scalePdfDimensions(in, target, true);
1824    }
1825
1826    private static Dimensions scalePdfDimensions(
1827            final Dimensions in, final int target, final boolean fit) {
1828        final int w, h;
1829        if (fit == (in.width <= in.height)) {
1830            w = Math.max((int) (in.width / ((double) in.height / target)), 1);
1831            h = target;
1832        } else {
1833            w = target;
1834            h = Math.max((int) (in.height / ((double) in.width / target)), 1);
1835        }
1836        return new Dimensions(h, w);
1837    }
1838
1839    public Bitmap getAvatar(String avatar, int size) {
1840        if (avatar == null) {
1841            return null;
1842        }
1843        Bitmap bm = cropCenter(getAvatarUri(avatar), size, size);
1844        return bm;
1845    }
1846
1847    private static class Dimensions {
1848        public final int width;
1849        public final int height;
1850
1851        Dimensions(int height, int width) {
1852            this.width = width;
1853            this.height = height;
1854        }
1855
1856        public int getMin() {
1857            return Math.min(width, height);
1858        }
1859
1860        public boolean valid() {
1861            return width > 0 && height > 0;
1862        }
1863    }
1864
1865    private static class NotAVideoFile extends Exception {
1866        public NotAVideoFile(Throwable t) {
1867            super(t);
1868        }
1869
1870        public NotAVideoFile() {
1871            super();
1872        }
1873    }
1874
1875    public static class ImageCompressionException extends Exception {
1876
1877        ImageCompressionException(String message) {
1878            super(message);
1879        }
1880    }
1881
1882    public static class FileCopyException extends Exception {
1883        private final int resId;
1884
1885        private FileCopyException(@StringRes int resId) {
1886            this.resId = resId;
1887        }
1888
1889        public @StringRes int getResId() {
1890            return resId;
1891        }
1892    }
1893}