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.cheogram.android.BobTransfer;
  41
  42import com.google.common.base.Strings;
  43import com.google.common.collect.ImmutableList;
  44import com.google.common.io.ByteStreams;
  45
  46import com.wolt.blurhashkt.BlurHashDecoder;
  47
  48import java.io.ByteArrayOutputStream;
  49import java.io.Closeable;
  50import java.io.File;
  51import java.io.FileDescriptor;
  52import java.io.FileInputStream;
  53import java.io.FileNotFoundException;
  54import java.io.FileOutputStream;
  55import java.io.IOException;
  56import java.io.InputStream;
  57import java.io.OutputStream;
  58import java.net.ServerSocket;
  59import java.net.Socket;
  60import java.nio.ByteBuffer;
  61import java.security.DigestOutputStream;
  62import java.security.MessageDigest;
  63import java.security.NoSuchAlgorithmException;
  64import java.text.SimpleDateFormat;
  65import java.util.ArrayList;
  66import java.util.Arrays;
  67import java.util.Date;
  68import java.util.List;
  69import java.util.Locale;
  70import java.util.UUID;
  71
  72import io.ipfs.cid.Cid;
  73
  74import eu.siacs.conversations.Config;
  75import eu.siacs.conversations.R;
  76import eu.siacs.conversations.entities.DownloadableFile;
  77import eu.siacs.conversations.entities.Message;
  78import eu.siacs.conversations.services.AttachFileToConversationRunnable;
  79import eu.siacs.conversations.services.XmppConnectionService;
  80import eu.siacs.conversations.ui.adapter.MediaAdapter;
  81import eu.siacs.conversations.ui.util.Attachment;
  82import eu.siacs.conversations.utils.CryptoHelper;
  83import eu.siacs.conversations.utils.FileUtils;
  84import eu.siacs.conversations.utils.FileWriterException;
  85import eu.siacs.conversations.utils.MimeUtils;
  86import eu.siacs.conversations.xmpp.pep.Avatar;
  87import eu.siacs.conversations.xml.Element;
  88
  89public class FileBackend {
  90
  91    private static final Object THUMBNAIL_LOCK = new Object();
  92
  93    private static final SimpleDateFormat IMAGE_DATE_FORMAT =
  94            new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US);
  95
  96    private static final String FILE_PROVIDER = ".files";
  97    private static final float IGNORE_PADDING = 0.15f;
  98    private final XmppConnectionService mXmppConnectionService;
  99
 100    private static final List<String> STORAGE_TYPES;
 101
 102    static {
 103        final ImmutableList.Builder<String> builder =
 104                new ImmutableList.Builder<String>()
 105                        .add(
 106                                Environment.DIRECTORY_DOWNLOADS,
 107                                Environment.DIRECTORY_PICTURES,
 108                                Environment.DIRECTORY_MOVIES);
 109        if (Build.VERSION.SDK_INT >= 19) {
 110            builder.add(Environment.DIRECTORY_DOCUMENTS);
 111        }
 112        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
 113            builder.add(Environment.DIRECTORY_RECORDINGS);
 114        }
 115        STORAGE_TYPES = builder.build();
 116    }
 117
 118    public FileBackend(XmppConnectionService service) {
 119        this.mXmppConnectionService = service;
 120    }
 121
 122    public static long getFileSize(Context context, Uri uri) {
 123        try (final Cursor cursor =
 124                context.getContentResolver().query(uri, null, null, null, null)) {
 125            if (cursor != null && cursor.moveToFirst()) {
 126                final int index = cursor.getColumnIndex(OpenableColumns.SIZE);
 127                if (index == -1) {
 128                    return -1;
 129                }
 130                return cursor.getLong(index);
 131            }
 132            return -1;
 133        } catch (final Exception ignored) {
 134            return -1;
 135        }
 136    }
 137
 138    public static boolean allFilesUnderSize(
 139            Context context, List<Attachment> attachments, long max) {
 140        final boolean compressVideo =
 141                !AttachFileToConversationRunnable.getVideoCompression(context)
 142                        .equals("uncompressed");
 143        if (max <= 0) {
 144            Log.d(Config.LOGTAG, "server did not report max file size for http upload");
 145            return true; // exception to be compatible with HTTP Upload < v0.2
 146        }
 147        for (Attachment attachment : attachments) {
 148            if (attachment.getType() != Attachment.Type.FILE) {
 149                continue;
 150            }
 151            String mime = attachment.getMime();
 152            if (mime != null && mime.startsWith("video/") && compressVideo) {
 153                try {
 154                    Dimensions dimensions =
 155                            FileBackend.getVideoDimensions(context, attachment.getUri());
 156                    if (dimensions.getMin() > 720) {
 157                        Log.d(
 158                                Config.LOGTAG,
 159                                "do not consider video file with min width larger than 720 for size check");
 160                        continue;
 161                    }
 162                } catch (NotAVideoFile notAVideoFile) {
 163                    // ignore and fall through
 164                }
 165            }
 166            if (FileBackend.getFileSize(context, attachment.getUri()) > max) {
 167                Log.d(
 168                        Config.LOGTAG,
 169                        "not all files are under "
 170                                + max
 171                                + " bytes. suggesting falling back to jingle");
 172                return false;
 173            }
 174        }
 175        return true;
 176    }
 177
 178    public static File getBackupDirectory(final Context context) {
 179        final File conversationsDownloadDirectory =
 180                new File(
 181                        Environment.getExternalStoragePublicDirectory(
 182                                Environment.DIRECTORY_DOWNLOADS),
 183                        context.getString(R.string.app_name));
 184        return new File(conversationsDownloadDirectory, "Backup");
 185    }
 186
 187    public static File getLegacyBackupDirectory(final String app) {
 188        final File appDirectory = new File(Environment.getExternalStorageDirectory(), app);
 189        return new File(appDirectory, "Backup");
 190    }
 191
 192    private static Bitmap rotate(final Bitmap bitmap, final int degree) {
 193        if (degree == 0) {
 194            return bitmap;
 195        }
 196        final int w = bitmap.getWidth();
 197        final int h = bitmap.getHeight();
 198        final Matrix matrix = new Matrix();
 199        matrix.postRotate(degree);
 200        final Bitmap result = Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix, true);
 201        if (!bitmap.isRecycled()) {
 202            bitmap.recycle();
 203        }
 204        return result;
 205    }
 206
 207    public static boolean isPathBlacklisted(String path) {
 208        final String androidDataPath =
 209                Environment.getExternalStorageDirectory().getAbsolutePath() + "/Android/data/";
 210        return path.startsWith(androidDataPath);
 211    }
 212
 213    private static Paint createAntiAliasingPaint() {
 214        Paint paint = new Paint();
 215        paint.setAntiAlias(true);
 216        paint.setFilterBitmap(true);
 217        paint.setDither(true);
 218        return paint;
 219    }
 220
 221    public static Uri getUriForUri(Context context, Uri uri) {
 222        if ("file".equals(uri.getScheme())) {
 223            return getUriForFile(context, new File(uri.getPath()));
 224        } else {
 225            return uri;
 226        }
 227    }
 228
 229    public static Uri getUriForFile(Context context, File file) {
 230        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N || Config.ONLY_INTERNAL_STORAGE) {
 231            try {
 232                return FileProvider.getUriForFile(context, getAuthority(context), file);
 233            } catch (IllegalArgumentException e) {
 234                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
 235                    throw new SecurityException(e);
 236                } else {
 237                    return Uri.fromFile(file);
 238                }
 239            }
 240        } else {
 241            return Uri.fromFile(file);
 242        }
 243    }
 244
 245    public static String getAuthority(Context context) {
 246        return context.getPackageName() + FILE_PROVIDER;
 247    }
 248
 249    private static boolean hasAlpha(final Bitmap bitmap) {
 250        final int w = bitmap.getWidth();
 251        final int h = bitmap.getHeight();
 252        final int yStep = Math.max(1, w / 100);
 253        final int xStep = Math.max(1, h / 100);
 254        for (int x = 0; x < w; x += xStep) {
 255            for (int y = 0; y < h; y += yStep) {
 256                if (Color.alpha(bitmap.getPixel(x, y)) < 255) {
 257                    return true;
 258                }
 259            }
 260        }
 261        return false;
 262    }
 263
 264    private static int calcSampleSize(File image, int size) {
 265        BitmapFactory.Options options = new BitmapFactory.Options();
 266        options.inJustDecodeBounds = true;
 267        BitmapFactory.decodeFile(image.getAbsolutePath(), options);
 268        return calcSampleSize(options, size);
 269    }
 270
 271    private static int calcSampleSize(BitmapFactory.Options options, int size) {
 272        int height = options.outHeight;
 273        int width = options.outWidth;
 274        int inSampleSize = 1;
 275
 276        if (height > size || width > size) {
 277            int halfHeight = height / 2;
 278            int halfWidth = width / 2;
 279
 280            while ((halfHeight / inSampleSize) > size && (halfWidth / inSampleSize) > size) {
 281                inSampleSize *= 2;
 282            }
 283        }
 284        return inSampleSize;
 285    }
 286
 287    private static Dimensions getVideoDimensions(Context context, Uri uri) throws NotAVideoFile {
 288        MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever();
 289        try {
 290            mediaMetadataRetriever.setDataSource(context, uri);
 291        } catch (RuntimeException e) {
 292            throw new NotAVideoFile(e);
 293        }
 294        return getVideoDimensions(mediaMetadataRetriever);
 295    }
 296
 297    private static Dimensions getVideoDimensionsOfFrame(
 298            MediaMetadataRetriever mediaMetadataRetriever) {
 299        Bitmap bitmap = null;
 300        try {
 301            bitmap = mediaMetadataRetriever.getFrameAtTime();
 302            return new Dimensions(bitmap.getHeight(), bitmap.getWidth());
 303        } catch (Exception e) {
 304            return null;
 305        } finally {
 306            if (bitmap != null) {
 307                bitmap.recycle();
 308            }
 309        }
 310    }
 311
 312    private static Dimensions getVideoDimensions(MediaMetadataRetriever metadataRetriever)
 313            throws NotAVideoFile {
 314        String hasVideo =
 315                metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_HAS_VIDEO);
 316        if (hasVideo == null) {
 317            throw new NotAVideoFile();
 318        }
 319        Dimensions dimensions = getVideoDimensionsOfFrame(metadataRetriever);
 320        if (dimensions != null) {
 321            return dimensions;
 322        }
 323        final int rotation = extractRotationFromMediaRetriever(metadataRetriever);
 324        boolean rotated = rotation == 90 || rotation == 270;
 325        int height;
 326        try {
 327            String h =
 328                    metadataRetriever.extractMetadata(
 329                            MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT);
 330            height = Integer.parseInt(h);
 331        } catch (Exception e) {
 332            height = -1;
 333        }
 334        int width;
 335        try {
 336            String w =
 337                    metadataRetriever.extractMetadata(
 338                            MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH);
 339            width = Integer.parseInt(w);
 340        } catch (Exception e) {
 341            width = -1;
 342        }
 343        metadataRetriever.release();
 344        Log.d(Config.LOGTAG, "extracted video dims " + width + "x" + height);
 345        return rotated ? new Dimensions(width, height) : new Dimensions(height, width);
 346    }
 347
 348    private static int extractRotationFromMediaRetriever(MediaMetadataRetriever metadataRetriever) {
 349        String r =
 350                metadataRetriever.extractMetadata(
 351                        MediaMetadataRetriever.METADATA_KEY_VIDEO_ROTATION);
 352        try {
 353            return Integer.parseInt(r);
 354        } catch (Exception e) {
 355            return 0;
 356        }
 357    }
 358
 359    public static void close(final Closeable stream) {
 360        if (stream != null) {
 361            try {
 362                stream.close();
 363            } catch (Exception e) {
 364                Log.d(Config.LOGTAG, "unable to close stream", e);
 365            }
 366        }
 367    }
 368
 369    public static void close(final Socket socket) {
 370        if (socket != null) {
 371            try {
 372                socket.close();
 373            } catch (IOException e) {
 374                Log.d(Config.LOGTAG, "unable to close socket", e);
 375            }
 376        }
 377    }
 378
 379    public static void close(final ServerSocket socket) {
 380        if (socket != null) {
 381            try {
 382                socket.close();
 383            } catch (IOException e) {
 384                Log.d(Config.LOGTAG, "unable to close server socket", e);
 385            }
 386        }
 387    }
 388
 389    public static boolean weOwnFile(final Uri uri) {
 390        if (uri == null || !ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
 391            return false;
 392        } else {
 393            return weOwnFileLollipop(uri);
 394        }
 395    }
 396
 397    private static boolean weOwnFileLollipop(final Uri uri) {
 398        final String path = uri.getPath();
 399        if (path == null) {
 400            return false;
 401        }
 402        try {
 403            File file = new File(path);
 404            FileDescriptor fd =
 405                    ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY)
 406                            .getFileDescriptor();
 407            StructStat st = Os.fstat(fd);
 408            return st.st_uid == android.os.Process.myUid();
 409        } catch (FileNotFoundException e) {
 410            return false;
 411        } catch (Exception e) {
 412            return true;
 413        }
 414    }
 415
 416    public static Uri getMediaUri(Context context, File file) {
 417        final String filePath = file.getAbsolutePath();
 418        try (final Cursor cursor =
 419                context.getContentResolver()
 420                        .query(
 421                                MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
 422                                new String[] {MediaStore.Images.Media._ID},
 423                                MediaStore.Images.Media.DATA + "=? ",
 424                                new String[] {filePath},
 425                                null)) {
 426            if (cursor != null && cursor.moveToFirst()) {
 427                final int id =
 428                        cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.MediaColumns._ID));
 429                return Uri.withAppendedPath(
 430                        MediaStore.Images.Media.EXTERNAL_CONTENT_URI, String.valueOf(id));
 431            } else {
 432                return null;
 433            }
 434        } catch (final Exception e) {
 435            return null;
 436        }
 437    }
 438
 439    public static void updateFileParams(Message message, String url, long size) {
 440        Message.FileParams fileParams = new Message.FileParams();
 441        fileParams.url = url;
 442        fileParams.size = size;
 443        message.setFileParams(fileParams);
 444    }
 445
 446    public Bitmap getPreviewForUri(Attachment attachment, int size, boolean cacheOnly) {
 447        final String key = "attachment_" + attachment.getUuid().toString() + "_" + size;
 448        final LruCache<String, Bitmap> cache = mXmppConnectionService.getBitmapCache();
 449        Bitmap bitmap = cache.get(key);
 450        if (bitmap != null || cacheOnly) {
 451            return bitmap;
 452        }
 453        final String mime = attachment.getMime();
 454        if ("application/pdf".equals(mime)) {
 455            bitmap = cropCenterSquarePdf(attachment.getUri(), size);
 456            drawOverlay(
 457                    bitmap,
 458                    paintOverlayBlackPdf(bitmap)
 459                            ? R.drawable.open_pdf_black
 460                            : R.drawable.open_pdf_white,
 461                    0.75f);
 462        } else if (mime != null && mime.startsWith("video/")) {
 463            bitmap = cropCenterSquareVideo(attachment.getUri(), size);
 464            drawOverlay(
 465                    bitmap,
 466                    paintOverlayBlack(bitmap)
 467                            ? R.drawable.play_video_black
 468                            : R.drawable.play_video_white,
 469                    0.75f);
 470        } else {
 471            bitmap = cropCenterSquare(attachment.getUri(), size);
 472            if (bitmap != null && "image/gif".equals(mime)) {
 473                Bitmap withGifOverlay = bitmap.copy(Bitmap.Config.ARGB_8888, true);
 474                drawOverlay(
 475                        withGifOverlay,
 476                        paintOverlayBlack(withGifOverlay)
 477                                ? R.drawable.play_gif_black
 478                                : R.drawable.play_gif_white,
 479                        1.0f);
 480                bitmap.recycle();
 481                bitmap = withGifOverlay;
 482            }
 483        }
 484        if (bitmap != null) {
 485            cache.put(key, bitmap);
 486        }
 487        return bitmap;
 488    }
 489
 490    public void updateMediaScanner(File file) {
 491        updateMediaScanner(file, null);
 492    }
 493
 494    public void updateMediaScanner(File file, final Runnable callback) {
 495        MediaScannerConnection.scanFile(
 496                mXmppConnectionService,
 497                new String[] {file.getAbsolutePath()},
 498                null,
 499                new MediaScannerConnection.MediaScannerConnectionClient() {
 500                    @Override
 501                    public void onMediaScannerConnected() {}
 502
 503                    @Override
 504                    public void onScanCompleted(String path, Uri uri) {
 505                        if (callback != null && file.getAbsolutePath().equals(path)) {
 506                            callback.run();
 507                        } else {
 508                            Log.d(Config.LOGTAG, "media scanner scanned wrong file");
 509                            if (callback != null) {
 510                                callback.run();
 511                            }
 512                        }
 513                    }
 514                });
 515    }
 516
 517    public boolean deleteFile(Message message) {
 518        File file = getFile(message);
 519        if (file.delete()) {
 520            updateMediaScanner(file);
 521            return true;
 522        } else {
 523            return false;
 524        }
 525    }
 526
 527    public DownloadableFile getFile(Message message) {
 528        return getFile(message, true);
 529    }
 530
 531    public DownloadableFile getFileForPath(String path) {
 532        return getFileForPath(
 533                path,
 534                MimeUtils.guessMimeTypeFromExtension(MimeUtils.extractRelevantExtension(path)));
 535    }
 536
 537    private DownloadableFile getFileForPath(final String path, final String mime) {
 538        if (path.startsWith("/")) {
 539            return new DownloadableFile(path);
 540        } else {
 541            return getLegacyFileForFilename(path, mime);
 542        }
 543    }
 544
 545    public DownloadableFile getLegacyFileForFilename(final String filename, final String mime) {
 546        if (Strings.isNullOrEmpty(mime)) {
 547            return new DownloadableFile(getLegacyStorageLocation("Files"), filename);
 548        } else if (mime.startsWith("image/")) {
 549            return new DownloadableFile(getLegacyStorageLocation("Images"), filename);
 550        } else if (mime.startsWith("video/")) {
 551            return new DownloadableFile(getLegacyStorageLocation("Videos"), filename);
 552        } else {
 553            return new DownloadableFile(getLegacyStorageLocation("Files"), filename);
 554        }
 555    }
 556
 557    public boolean isInternalFile(final File file) {
 558        final File internalFile = getFileForPath(file.getName());
 559        return file.getAbsolutePath().equals(internalFile.getAbsolutePath());
 560    }
 561
 562    public DownloadableFile getFile(Message message, boolean decrypted) {
 563        final boolean encrypted =
 564                !decrypted
 565                        && (message.getEncryption() == Message.ENCRYPTION_PGP
 566                                || message.getEncryption() == Message.ENCRYPTION_DECRYPTED);
 567        String path = message.getRelativeFilePath();
 568        if (path == null) {
 569            path = message.getUuid();
 570        }
 571        final DownloadableFile file = getFileForPath(path, message.getMimeType());
 572        if (encrypted) {
 573            return new DownloadableFile(
 574                    mXmppConnectionService.getCacheDir(),
 575                    String.format("%s.%s", file.getName(), "pgp"));
 576        } else {
 577            return file;
 578        }
 579    }
 580
 581    public List<Attachment> convertToAttachments(List<DatabaseBackend.FilePath> relativeFilePaths) {
 582        final List<Attachment> attachments = new ArrayList<>();
 583        for (final DatabaseBackend.FilePath relativeFilePath : relativeFilePaths) {
 584            final String mime =
 585                    MimeUtils.guessMimeTypeFromExtension(
 586                            MimeUtils.extractRelevantExtension(relativeFilePath.path));
 587            final File file = getFileForPath(relativeFilePath.path, mime);
 588            attachments.add(Attachment.of(relativeFilePath.uuid, file, mime));
 589        }
 590        return attachments;
 591    }
 592
 593    private File getLegacyStorageLocation(final String type) {
 594        if (Config.ONLY_INTERNAL_STORAGE) {
 595            return new File(mXmppConnectionService.getFilesDir(), type);
 596        } else {
 597            final File appDirectory =
 598                    new File(
 599                            Environment.getExternalStorageDirectory(),
 600                            mXmppConnectionService.getString(R.string.app_name));
 601            final File appMediaDirectory = new File(appDirectory, "Media");
 602            final String locationName =
 603                    String.format(
 604                            "%s %s", mXmppConnectionService.getString(R.string.app_name), type);
 605            return new File(appMediaDirectory, locationName);
 606        }
 607    }
 608
 609    private Bitmap resize(final Bitmap originalBitmap, int size) throws IOException {
 610        int w = originalBitmap.getWidth();
 611        int h = originalBitmap.getHeight();
 612        if (w <= 0 || h <= 0) {
 613            throw new IOException("Decoded bitmap reported bounds smaller 0");
 614        } else if (Math.max(w, h) > size) {
 615            int scalledW;
 616            int scalledH;
 617            if (w <= h) {
 618                scalledW = Math.max((int) (w / ((double) h / size)), 1);
 619                scalledH = size;
 620            } else {
 621                scalledW = size;
 622                scalledH = Math.max((int) (h / ((double) w / size)), 1);
 623            }
 624            final Bitmap result =
 625                    Bitmap.createScaledBitmap(originalBitmap, scalledW, scalledH, true);
 626            if (!originalBitmap.isRecycled()) {
 627                originalBitmap.recycle();
 628            }
 629            return result;
 630        } else {
 631            return originalBitmap;
 632        }
 633    }
 634
 635    public boolean useImageAsIs(final Uri uri) {
 636        final String path = getOriginalPath(uri);
 637        if (path == null || isPathBlacklisted(path)) {
 638            return false;
 639        }
 640        final File file = new File(path);
 641        long size = file.length();
 642        if (size == 0
 643                || size
 644                        >= mXmppConnectionService
 645                                .getResources()
 646                                .getInteger(R.integer.auto_accept_filesize)) {
 647            return false;
 648        }
 649        BitmapFactory.Options options = new BitmapFactory.Options();
 650        options.inJustDecodeBounds = true;
 651        try {
 652            final InputStream inputStream =
 653                    mXmppConnectionService.getContentResolver().openInputStream(uri);
 654            BitmapFactory.decodeStream(inputStream, null, options);
 655            close(inputStream);
 656            if (options.outMimeType == null || options.outHeight <= 0 || options.outWidth <= 0) {
 657                return false;
 658            }
 659            return (options.outWidth <= Config.IMAGE_SIZE
 660                    && options.outHeight <= Config.IMAGE_SIZE
 661                    && options.outMimeType.contains(Config.IMAGE_FORMAT.name().toLowerCase()));
 662        } catch (FileNotFoundException e) {
 663            Log.d(Config.LOGTAG, "unable to get image dimensions", e);
 664            return false;
 665        }
 666    }
 667
 668    public String getOriginalPath(Uri uri) {
 669        return FileUtils.getPath(mXmppConnectionService, uri);
 670    }
 671
 672    private void copyFileToPrivateStorage(File file, Uri uri) throws FileCopyException {
 673        Log.d(
 674                Config.LOGTAG,
 675                "copy file (" + uri.toString() + ") to private storage " + file.getAbsolutePath());
 676        file.getParentFile().mkdirs();
 677        try {
 678            file.createNewFile();
 679        } catch (IOException e) {
 680            throw new FileCopyException(R.string.error_unable_to_create_temporary_file);
 681        }
 682        try (final OutputStream os = new FileOutputStream(file);
 683                final InputStream is =
 684                        mXmppConnectionService.getContentResolver().openInputStream(uri)) {
 685            if (is == null) {
 686                throw new FileCopyException(R.string.error_file_not_found);
 687            }
 688            try {
 689                ByteStreams.copy(is, os);
 690            } catch (IOException e) {
 691                throw new FileWriterException(file);
 692            }
 693            try {
 694                os.flush();
 695            } catch (IOException e) {
 696                throw new FileWriterException(file);
 697            }
 698        } catch (final FileNotFoundException e) {
 699            cleanup(file);
 700            throw new FileCopyException(R.string.error_file_not_found);
 701        } catch (final FileWriterException e) {
 702            cleanup(file);
 703            throw new FileCopyException(R.string.error_unable_to_create_temporary_file);
 704        } catch (final SecurityException | IllegalStateException e) {
 705            cleanup(file);
 706            throw new FileCopyException(R.string.error_security_exception);
 707        } catch (final IOException e) {
 708            cleanup(file);
 709            throw new FileCopyException(R.string.error_io_exception);
 710        }
 711    }
 712
 713    public void copyFileToPrivateStorage(Message message, Uri uri, String type)
 714            throws FileCopyException {
 715        String mime = MimeUtils.guessMimeTypeFromUriAndMime(mXmppConnectionService, uri, type);
 716        Log.d(Config.LOGTAG, "copy " + uri.toString() + " to private storage (mime=" + mime + ")");
 717        String extension = MimeUtils.guessExtensionFromMimeType(mime);
 718        if (extension == null) {
 719            Log.d(Config.LOGTAG, "extension from mime type was null");
 720            extension = getExtensionFromUri(uri);
 721        }
 722        if ("ogg".equals(extension) && type != null && type.startsWith("audio/")) {
 723            extension = "oga";
 724        }
 725
 726        setupRelativeFilePath(message, uri, extension);
 727        copyFileToPrivateStorage(mXmppConnectionService.getFileBackend().getFile(message), uri);
 728    }
 729
 730    private String getExtensionFromUri(final Uri uri) {
 731        final String[] projection = {MediaStore.MediaColumns.DATA};
 732        String filename = null;
 733        try (final Cursor cursor =
 734                mXmppConnectionService
 735                        .getContentResolver()
 736                        .query(uri, projection, null, null, null)) {
 737            if (cursor != null && cursor.moveToFirst()) {
 738                filename = cursor.getString(0);
 739            }
 740        } catch (final Exception e) {
 741            filename = null;
 742        }
 743        if (filename == null) {
 744            final List<String> segments = uri.getPathSegments();
 745            if (segments.size() > 0) {
 746                filename = segments.get(segments.size() - 1);
 747            }
 748        }
 749        final int pos = filename == null ? -1 : filename.lastIndexOf('.');
 750        return pos > 0 ? filename.substring(pos + 1) : null;
 751    }
 752
 753    private void copyImageToPrivateStorage(File file, Uri image, int sampleSize)
 754            throws FileCopyException, ImageCompressionException {
 755        final File parent = file.getParentFile();
 756        if (parent != null && parent.mkdirs()) {
 757            Log.d(Config.LOGTAG, "created parent directory");
 758        }
 759        InputStream is = null;
 760        OutputStream os = null;
 761        try {
 762            if (!file.exists() && !file.createNewFile()) {
 763                throw new FileCopyException(R.string.error_unable_to_create_temporary_file);
 764            }
 765            is = mXmppConnectionService.getContentResolver().openInputStream(image);
 766            if (is == null) {
 767                throw new FileCopyException(R.string.error_not_an_image_file);
 768            }
 769            final Bitmap originalBitmap;
 770            final BitmapFactory.Options options = new BitmapFactory.Options();
 771            final int inSampleSize = (int) Math.pow(2, sampleSize);
 772            Log.d(Config.LOGTAG, "reading bitmap with sample size " + inSampleSize);
 773            options.inSampleSize = inSampleSize;
 774            originalBitmap = BitmapFactory.decodeStream(is, null, options);
 775            is.close();
 776            if (originalBitmap == null) {
 777                throw new ImageCompressionException("Source file was not an image");
 778            }
 779            if (!"image/jpeg".equals(options.outMimeType) && hasAlpha(originalBitmap)) {
 780                originalBitmap.recycle();
 781                throw new ImageCompressionException("Source file had alpha channel");
 782            }
 783            Bitmap scaledBitmap = resize(originalBitmap, Config.IMAGE_SIZE);
 784            final int rotation = getRotation(image);
 785            scaledBitmap = rotate(scaledBitmap, rotation);
 786            boolean targetSizeReached = false;
 787            int quality = Config.IMAGE_QUALITY;
 788            final int imageMaxSize =
 789                    mXmppConnectionService
 790                            .getResources()
 791                            .getInteger(R.integer.auto_accept_filesize);
 792            while (!targetSizeReached) {
 793                os = new FileOutputStream(file);
 794                Log.d(Config.LOGTAG, "compressing image with quality " + quality);
 795                boolean success = scaledBitmap.compress(Config.IMAGE_FORMAT, quality, os);
 796                if (!success) {
 797                    throw new FileCopyException(R.string.error_compressing_image);
 798                }
 799                os.flush();
 800                final long fileSize = file.length();
 801                Log.d(Config.LOGTAG, "achieved file size of " + fileSize);
 802                targetSizeReached = fileSize <= imageMaxSize || quality <= 50;
 803                quality -= 5;
 804            }
 805            scaledBitmap.recycle();
 806        } catch (final FileNotFoundException e) {
 807            cleanup(file);
 808            throw new FileCopyException(R.string.error_file_not_found);
 809        } catch (final IOException e) {
 810            cleanup(file);
 811            throw new FileCopyException(R.string.error_io_exception);
 812        } catch (SecurityException e) {
 813            cleanup(file);
 814            throw new FileCopyException(R.string.error_security_exception_during_image_copy);
 815        } catch (final OutOfMemoryError e) {
 816            ++sampleSize;
 817            if (sampleSize <= 3) {
 818                copyImageToPrivateStorage(file, image, sampleSize);
 819            } else {
 820                throw new FileCopyException(R.string.error_out_of_memory);
 821            }
 822        } finally {
 823            close(os);
 824            close(is);
 825        }
 826    }
 827
 828    private static void cleanup(final File file) {
 829        try {
 830            file.delete();
 831        } catch (Exception e) {
 832
 833        }
 834    }
 835
 836    public void copyImageToPrivateStorage(File file, Uri image)
 837            throws FileCopyException, ImageCompressionException {
 838        Log.d(
 839                Config.LOGTAG,
 840                "copy image ("
 841                        + image.toString()
 842                        + ") to private storage "
 843                        + file.getAbsolutePath());
 844        copyImageToPrivateStorage(file, image, 0);
 845    }
 846
 847    public void copyImageToPrivateStorage(Message message, Uri image)
 848            throws FileCopyException, ImageCompressionException {
 849        final String filename;
 850        switch (Config.IMAGE_FORMAT) {
 851            case JPEG:
 852                filename = String.format("%s.%s", message.getUuid(), "jpg");
 853                break;
 854            case PNG:
 855                filename = String.format("%s.%s", message.getUuid(), "png");
 856                break;
 857            case WEBP:
 858                filename = String.format("%s.%s", message.getUuid(), "webp");
 859                break;
 860            default:
 861                throw new IllegalStateException("Unknown image format");
 862        }
 863        setupRelativeFilePath(message, filename);
 864        final File tmp = getFile(message);
 865        copyImageToPrivateStorage(tmp, image);
 866        final String extension = MimeUtils.extractRelevantExtension(filename);
 867        try {
 868            setupRelativeFilePath(message, new FileInputStream(tmp), extension);
 869        } catch (final FileNotFoundException e) {
 870            throw new FileCopyException(R.string.error_file_not_found);
 871        } catch (final IOException e) {
 872            throw new FileCopyException(R.string.error_io_exception);
 873        }
 874        tmp.renameTo(getFile(message));
 875        updateFileParams(message, null, false);
 876    }
 877
 878    public void setupRelativeFilePath(final Message message, final Uri uri, final String extension) throws FileCopyException {
 879        try {
 880            setupRelativeFilePath(message, mXmppConnectionService.getContentResolver().openInputStream(uri), extension);
 881        } catch (final FileNotFoundException e) {
 882            throw new FileCopyException(R.string.error_file_not_found);
 883        } catch (final IOException e) {
 884            throw new FileCopyException(R.string.error_io_exception);
 885        }
 886    }
 887
 888    public Cid[] calculateCids(final InputStream is) throws IOException {
 889        try {
 890            return CryptoHelper.cid(is, new String[]{"SHA-256", "SHA-1", "SHA-512"});
 891        } catch (final NoSuchAlgorithmException e) {
 892            throw new AssertionError(e);
 893        }
 894    }
 895
 896    public void setupRelativeFilePath(final Message message, final InputStream is, final String extension) throws IOException {
 897        message.setRelativeFilePath(getStorageLocation(is, extension).getAbsolutePath());
 898    }
 899
 900    public void setupRelativeFilePath(final Message message, final String filename) {
 901        final String extension = MimeUtils.extractRelevantExtension(filename);
 902        final String mime = MimeUtils.guessMimeTypeFromExtension(extension);
 903        setupRelativeFilePath(message, filename, mime);
 904    }
 905
 906    public File getStorageLocation(final InputStream is, final String extension) throws IOException {
 907        final String mime = MimeUtils.guessMimeTypeFromExtension(extension);
 908        Cid[] cids = calculateCids(is);
 909
 910        File file = getStorageLocation(String.format("%s.%s", cids[0], extension), mime);
 911        for (int i = 0; i < cids.length; i++) {
 912            mXmppConnectionService.saveCid(cids[i], file);
 913        }
 914        return file;
 915    }
 916
 917    public File getStorageLocation(final String filename, final String mime) {
 918        final File parentDirectory;
 919        if (Strings.isNullOrEmpty(mime)) {
 920            parentDirectory =
 921                    Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
 922        } else if (mime.startsWith("image/")) {
 923            parentDirectory =
 924                    Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
 925        } else if (mime.startsWith("video/")) {
 926            parentDirectory =
 927                    Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES);
 928        } else if (MediaAdapter.DOCUMENT_MIMES.contains(mime)) {
 929            parentDirectory =
 930                    Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS);
 931        } else {
 932            parentDirectory =
 933                    Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
 934        }
 935        final File appDirectory =
 936                new File(parentDirectory, mXmppConnectionService.getString(R.string.app_name));
 937        return new File(appDirectory, filename);
 938    }
 939
 940    public static boolean inConversationsDirectory(final Context context, String path) {
 941        final File fileDirectory = new File(path).getParentFile();
 942        for (final String type : STORAGE_TYPES) {
 943            final File typeDirectory =
 944                    new File(
 945                            Environment.getExternalStoragePublicDirectory(type),
 946                            context.getString(R.string.app_name));
 947            if (typeDirectory.equals(fileDirectory)) {
 948                return true;
 949            }
 950        }
 951        return false;
 952    }
 953
 954    public void setupRelativeFilePath(
 955            final Message message, final String filename, final String mime) {
 956        final File file = getStorageLocation(filename, mime);
 957        message.setRelativeFilePath(file.getAbsolutePath());
 958    }
 959
 960    public boolean unusualBounds(final Uri image) {
 961        try {
 962            final BitmapFactory.Options options = new BitmapFactory.Options();
 963            options.inJustDecodeBounds = true;
 964            final InputStream inputStream =
 965                    mXmppConnectionService.getContentResolver().openInputStream(image);
 966            BitmapFactory.decodeStream(inputStream, null, options);
 967            close(inputStream);
 968            float ratio = (float) options.outHeight / options.outWidth;
 969            return ratio > (21.0f / 9.0f) || ratio < (9.0f / 21.0f);
 970        } catch (final Exception e) {
 971            Log.w(Config.LOGTAG, "unable to detect image bounds", e);
 972            return false;
 973        }
 974    }
 975
 976    private int getRotation(final File file) {
 977        try (final InputStream inputStream = new FileInputStream(file)) {
 978            return getRotation(inputStream);
 979        } catch (Exception e) {
 980            return 0;
 981        }
 982    }
 983
 984    private int getRotation(final Uri image) {
 985        try (final InputStream is =
 986                mXmppConnectionService.getContentResolver().openInputStream(image)) {
 987            return is == null ? 0 : getRotation(is);
 988        } catch (final Exception e) {
 989            return 0;
 990        }
 991    }
 992
 993    private static int getRotation(final InputStream inputStream) throws IOException {
 994        final ExifInterface exif = new ExifInterface(inputStream);
 995        final int orientation =
 996                exif.getAttributeInt(
 997                        ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED);
 998        switch (orientation) {
 999            case ExifInterface.ORIENTATION_ROTATE_180:
1000                return 180;
1001            case ExifInterface.ORIENTATION_ROTATE_90:
1002                return 90;
1003            case ExifInterface.ORIENTATION_ROTATE_270:
1004                return 270;
1005            default:
1006                return 0;
1007        }
1008    }
1009
1010    public BitmapDrawable getFallbackThumbnail(final Message message, int size) {
1011        List<Element> thumbs = message.getFileParams() != null ? message.getFileParams().getThumbnails() : null;
1012        if (thumbs != null && !thumbs.isEmpty()) {
1013            for (Element thumb : thumbs) {
1014                Uri uri = Uri.parse(thumb.getAttribute("uri"));
1015                if (uri.getScheme().equals("data")) {
1016                    String[] parts = uri.getSchemeSpecificPart().split(",", 2);
1017                    if (parts[0].equals("image/blurhash")) {
1018                        final LruCache<String, Drawable> cache = mXmppConnectionService.getDrawableCache();
1019                        BitmapDrawable cached = (BitmapDrawable) cache.get(parts[1]);
1020                        if (cached != null) return cached;
1021
1022                        int width = message.getFileParams().width;
1023                        if (width < 1 && thumb.getAttribute("width") != null) width = Integer.parseInt(thumb.getAttribute("width"));
1024                        if (width < 1) width = 1920;
1025
1026                        int height = message.getFileParams().height;
1027                        if (height < 1 && thumb.getAttribute("height") != null) height = Integer.parseInt(thumb.getAttribute("height"));
1028                        if (height < 1) height = 1080;
1029                        Rect r = rectForSize(width, height, size);
1030
1031                        Bitmap blurhash = BlurHashDecoder.INSTANCE.decode(parts[1], r.width(), r.height(), 1.0f, false);
1032                        if (blurhash != null) {
1033                            cached = new BitmapDrawable(blurhash);
1034                            cache.put(parts[1], cached);
1035                            return cached;
1036                        }
1037                    }
1038                }
1039            }
1040         }
1041
1042        return null;
1043    }
1044
1045    public Drawable getThumbnail(Message message, Resources res, int size, boolean cacheOnly) throws IOException {
1046        final LruCache<String, Drawable> cache = mXmppConnectionService.getDrawableCache();
1047        DownloadableFile file = getFile(message);
1048        Drawable thumbnail = cache.get(file.getAbsolutePath());
1049        if (thumbnail != null) return thumbnail;
1050
1051        if ((thumbnail == null) && (!cacheOnly)) {
1052            synchronized (THUMBNAIL_LOCK) {
1053                List<Element> thumbs = message.getFileParams() != null ? message.getFileParams().getThumbnails() : null;
1054                if (thumbs != null && !thumbs.isEmpty()) {
1055                    for (Element thumb : thumbs) {
1056                        Uri uri = Uri.parse(thumb.getAttribute("uri"));
1057                        if (uri.getScheme().equals("data")) {
1058                            if (android.os.Build.VERSION.SDK_INT < 28) continue;
1059                            String[] parts = uri.getSchemeSpecificPart().split(",", 2);
1060                            byte[] data;
1061                            if (Arrays.asList(parts[0].split(";")).contains("base64")) {
1062                                data = Base64.decode(parts[1], 0);
1063                            } else {
1064                                data = parts[1].getBytes("UTF-8");
1065                            }
1066
1067                            ImageDecoder.Source source = ImageDecoder.createSource(ByteBuffer.wrap(data));
1068                            thumbnail = ImageDecoder.decodeDrawable(source, (decoder, info, src) -> {
1069                                int w = info.getSize().getWidth();
1070                                int h = info.getSize().getHeight();
1071                                Rect r = rectForSize(w, h, size);
1072                                decoder.setTargetSize(r.width(), r.height());
1073                            });
1074
1075                            if (thumbnail != null) {
1076                                cache.put(file.getAbsolutePath(), thumbnail);
1077                                return thumbnail;
1078                            }
1079                        } else if (uri.getScheme().equals("cid")) {
1080                            Cid cid = BobTransfer.cid(uri);
1081                            if (cid == null) continue;
1082                            DownloadableFile f = mXmppConnectionService.getFileForCid(cid);
1083                            if (f != null && f.canRead()) {
1084                                return getThumbnail(f, res, size, cacheOnly);
1085                            }
1086                        }
1087                    }
1088                }
1089            }
1090        }
1091
1092        return getThumbnail(file, res, size, cacheOnly);
1093    }
1094
1095    public Drawable getThumbnail(DownloadableFile file, Resources res, int size, boolean cacheOnly) throws IOException {
1096        final LruCache<String, Drawable> cache = mXmppConnectionService.getDrawableCache();
1097        Drawable thumbnail = cache.get(file.getAbsolutePath());
1098        if ((thumbnail == null) && (!cacheOnly)) {
1099            synchronized (THUMBNAIL_LOCK) {
1100                thumbnail = cache.get(file.getAbsolutePath());
1101                if (thumbnail != null) {
1102                    return thumbnail;
1103                }
1104                final String mime = file.getMimeType();
1105                if ("application/pdf".equals(mime)) {
1106                    thumbnail = new BitmapDrawable(res, getPdfDocumentPreview(file, size));
1107                } else if (mime.startsWith("video/")) {
1108                    thumbnail = new BitmapDrawable(res, getVideoPreview(file, size));
1109                } else {
1110                    thumbnail = getImagePreview(file, res, size, mime);
1111                    if (thumbnail == null) {
1112                        throw new FileNotFoundException();
1113                    }
1114                }
1115                cache.put(file.getAbsolutePath(), thumbnail);
1116            }
1117        }
1118        return thumbnail;
1119    }
1120
1121    public Bitmap getThumbnailBitmap(Message message, Resources res, int size) throws IOException {
1122          final Drawable drawable = getThumbnail(message, res, size, false);
1123          if (drawable == null) return null;
1124          return drawDrawable(drawable);
1125    }
1126
1127    public static Rect rectForSize(int w, int h, int size) {
1128        int scalledW;
1129        int scalledH;
1130        if (w <= h) {
1131            scalledW = Math.max((int) (w / ((double) h / size)), 1);
1132            scalledH = size;
1133        } else {
1134            scalledW = size;
1135            scalledH = Math.max((int) (h / ((double) w / size)), 1);
1136        }
1137
1138        if (scalledW > w || scalledH > h) return new Rect(0, 0, w, h);
1139
1140        return new Rect(0, 0, scalledW, scalledH);
1141    }
1142
1143    private Drawable getImagePreview(File file, Resources res, int size, final String mime) throws IOException {
1144        if (android.os.Build.VERSION.SDK_INT >= 28) {
1145            ImageDecoder.Source source = ImageDecoder.createSource(file);
1146            return ImageDecoder.decodeDrawable(source, (decoder, info, src) -> {
1147                int w = info.getSize().getWidth();
1148                int h = info.getSize().getHeight();
1149                Rect r = rectForSize(w, h, size);
1150                decoder.setTargetSize(r.width(), r.height());
1151            });
1152        } else {
1153            BitmapFactory.Options options = new BitmapFactory.Options();
1154            options.inSampleSize = calcSampleSize(file, size);
1155            Bitmap bitmap = null;
1156            try {
1157                bitmap = BitmapFactory.decodeFile(file.getAbsolutePath(), options);
1158            } catch (OutOfMemoryError e) {
1159                options.inSampleSize *= 2;
1160                bitmap = BitmapFactory.decodeFile(file.getAbsolutePath(), options);
1161            }
1162            if (bitmap == null) return null;
1163
1164            bitmap = resize(bitmap, size);
1165            bitmap = rotate(bitmap, getRotation(file));
1166            if (mime.equals("image/gif")) {
1167                Bitmap withGifOverlay = bitmap.copy(Bitmap.Config.ARGB_8888, true);
1168                drawOverlay(withGifOverlay, paintOverlayBlack(withGifOverlay) ? R.drawable.play_gif_black : R.drawable.play_gif_white, 1.0f);
1169                bitmap.recycle();
1170                bitmap = withGifOverlay;
1171            }
1172            return new BitmapDrawable(res, bitmap);
1173        }
1174    }
1175
1176    protected Bitmap drawDrawable(Drawable drawable) {
1177        Bitmap bitmap = null;
1178
1179        if (drawable instanceof BitmapDrawable) {
1180            bitmap = ((BitmapDrawable) drawable).getBitmap();
1181            if (bitmap != null) return bitmap;
1182        }
1183
1184        bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
1185        Canvas canvas = new Canvas(bitmap);
1186        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
1187        drawable.draw(canvas);
1188        return bitmap;
1189    }
1190
1191    private void drawOverlay(Bitmap bitmap, int resource, float factor) {
1192        Bitmap overlay =
1193                BitmapFactory.decodeResource(mXmppConnectionService.getResources(), resource);
1194        Canvas canvas = new Canvas(bitmap);
1195        float targetSize = Math.min(canvas.getWidth(), canvas.getHeight()) * factor;
1196        Log.d(
1197                Config.LOGTAG,
1198                "target size overlay: "
1199                        + targetSize
1200                        + " overlay bitmap size was "
1201                        + overlay.getHeight());
1202        float left = (canvas.getWidth() - targetSize) / 2.0f;
1203        float top = (canvas.getHeight() - targetSize) / 2.0f;
1204        RectF dst = new RectF(left, top, left + targetSize - 1, top + targetSize - 1);
1205        canvas.drawBitmap(overlay, null, dst, createAntiAliasingPaint());
1206    }
1207
1208    /** https://stackoverflow.com/a/3943023/210897 */
1209    private boolean paintOverlayBlack(final Bitmap bitmap) {
1210        final int h = bitmap.getHeight();
1211        final int w = bitmap.getWidth();
1212        int record = 0;
1213        for (int y = Math.round(h * IGNORE_PADDING); y < h - Math.round(h * IGNORE_PADDING); ++y) {
1214            for (int x = Math.round(w * IGNORE_PADDING);
1215                    x < w - Math.round(w * IGNORE_PADDING);
1216                    ++x) {
1217                int pixel = bitmap.getPixel(x, y);
1218                if ((Color.red(pixel) * 0.299
1219                                + Color.green(pixel) * 0.587
1220                                + Color.blue(pixel) * 0.114)
1221                        > 186) {
1222                    --record;
1223                } else {
1224                    ++record;
1225                }
1226            }
1227        }
1228        return record < 0;
1229    }
1230
1231    private boolean paintOverlayBlackPdf(final Bitmap bitmap) {
1232        final int h = bitmap.getHeight();
1233        final int w = bitmap.getWidth();
1234        int white = 0;
1235        for (int y = 0; y < h; ++y) {
1236            for (int x = 0; x < w; ++x) {
1237                int pixel = bitmap.getPixel(x, y);
1238                if ((Color.red(pixel) * 0.299
1239                                + Color.green(pixel) * 0.587
1240                                + Color.blue(pixel) * 0.114)
1241                        > 186) {
1242                    white++;
1243                }
1244            }
1245        }
1246        return white > (h * w * 0.4f);
1247    }
1248
1249    private Bitmap cropCenterSquareVideo(Uri uri, int size) {
1250        MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever();
1251        Bitmap frame;
1252        try {
1253            metadataRetriever.setDataSource(mXmppConnectionService, uri);
1254            frame = metadataRetriever.getFrameAtTime(0);
1255            metadataRetriever.release();
1256            return cropCenterSquare(frame, size);
1257        } catch (Exception e) {
1258            frame = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
1259            frame.eraseColor(0xff000000);
1260            return frame;
1261        }
1262    }
1263
1264    private Bitmap getVideoPreview(final File file, final int size) {
1265        final MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever();
1266        Bitmap frame;
1267        try {
1268            metadataRetriever.setDataSource(file.getAbsolutePath());
1269            frame = metadataRetriever.getFrameAtTime(0);
1270            metadataRetriever.release();
1271            frame = resize(frame, size);
1272        } catch (IOException | RuntimeException e) {
1273            frame = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
1274            frame.eraseColor(0xff000000);
1275        }
1276        drawOverlay(
1277                frame,
1278                paintOverlayBlack(frame)
1279                        ? R.drawable.play_video_black
1280                        : R.drawable.play_video_white,
1281                0.75f);
1282        return frame;
1283    }
1284
1285    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
1286    private Bitmap getPdfDocumentPreview(final File file, final int size) {
1287        try {
1288            final ParcelFileDescriptor fileDescriptor =
1289                    ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
1290            final Bitmap rendered = renderPdfDocument(fileDescriptor, size, true);
1291            drawOverlay(
1292                    rendered,
1293                    paintOverlayBlackPdf(rendered)
1294                            ? R.drawable.open_pdf_black
1295                            : R.drawable.open_pdf_white,
1296                    0.75f);
1297            return rendered;
1298        } catch (final IOException | SecurityException e) {
1299            Log.d(Config.LOGTAG, "unable to render PDF document preview", e);
1300            final Bitmap placeholder = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
1301            placeholder.eraseColor(0xff000000);
1302            return placeholder;
1303        }
1304    }
1305
1306    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
1307    private Bitmap cropCenterSquarePdf(final Uri uri, final int size) {
1308        try {
1309            ParcelFileDescriptor fileDescriptor =
1310                    mXmppConnectionService.getContentResolver().openFileDescriptor(uri, "r");
1311            final Bitmap bitmap = renderPdfDocument(fileDescriptor, size, false);
1312            return cropCenterSquare(bitmap, size);
1313        } catch (Exception e) {
1314            final Bitmap placeholder = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
1315            placeholder.eraseColor(0xff000000);
1316            return placeholder;
1317        }
1318    }
1319
1320    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
1321    private Bitmap renderPdfDocument(
1322            ParcelFileDescriptor fileDescriptor, int targetSize, boolean fit) throws IOException {
1323        final PdfRenderer pdfRenderer = new PdfRenderer(fileDescriptor);
1324        final PdfRenderer.Page page = pdfRenderer.openPage(0);
1325        final Dimensions dimensions =
1326                scalePdfDimensions(
1327                        new Dimensions(page.getHeight(), page.getWidth()), targetSize, fit);
1328        final Bitmap rendered =
1329                Bitmap.createBitmap(dimensions.width, dimensions.height, Bitmap.Config.ARGB_8888);
1330        rendered.eraseColor(0xffffffff);
1331        page.render(rendered, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY);
1332        page.close();
1333        pdfRenderer.close();
1334        fileDescriptor.close();
1335        return rendered;
1336    }
1337
1338    public Uri getTakePhotoUri() {
1339        final String filename =
1340                String.format("IMG_%s.%s", IMAGE_DATE_FORMAT.format(new Date()), "jpg");
1341        final File directory;
1342        if (Config.ONLY_INTERNAL_STORAGE) {
1343            directory = new File(mXmppConnectionService.getCacheDir(), "Camera");
1344        } else {
1345            directory =
1346                    new File(
1347                            Environment.getExternalStoragePublicDirectory(
1348                                    Environment.DIRECTORY_DCIM),
1349                            "Camera");
1350        }
1351        final File file = new File(directory, filename);
1352        file.getParentFile().mkdirs();
1353        return getUriForFile(mXmppConnectionService, file);
1354    }
1355
1356    public Avatar getPepAvatar(Uri image, int size, Bitmap.CompressFormat format) {
1357
1358        final Avatar uncompressAvatar = getUncompressedAvatar(image);
1359        if (uncompressAvatar != null
1360                && uncompressAvatar.image.length() <= Config.AVATAR_CHAR_LIMIT) {
1361            return uncompressAvatar;
1362        }
1363        if (uncompressAvatar != null) {
1364            Log.d(
1365                    Config.LOGTAG,
1366                    "uncompressed avatar exceeded char limit by "
1367                            + (uncompressAvatar.image.length() - Config.AVATAR_CHAR_LIMIT));
1368        }
1369
1370        Bitmap bm = cropCenterSquare(image, size);
1371        if (bm == null) {
1372            return null;
1373        }
1374        if (hasAlpha(bm)) {
1375            Log.d(Config.LOGTAG, "alpha in avatar detected; uploading as PNG");
1376            bm.recycle();
1377            bm = cropCenterSquare(image, 96);
1378            return getPepAvatar(bm, Bitmap.CompressFormat.PNG, 100);
1379        }
1380        return getPepAvatar(bm, format, 100);
1381    }
1382
1383    private Avatar getUncompressedAvatar(Uri uri) {
1384        Bitmap bitmap = null;
1385        try {
1386            bitmap =
1387                    BitmapFactory.decodeStream(
1388                            mXmppConnectionService.getContentResolver().openInputStream(uri));
1389            return getPepAvatar(bitmap, Bitmap.CompressFormat.PNG, 100);
1390        } catch (Exception e) {
1391            return null;
1392        } finally {
1393            if (bitmap != null) {
1394                bitmap.recycle();
1395            }
1396        }
1397    }
1398
1399    private Avatar getPepAvatar(Bitmap bitmap, Bitmap.CompressFormat format, int quality) {
1400        try {
1401            ByteArrayOutputStream mByteArrayOutputStream = new ByteArrayOutputStream();
1402            Base64OutputStream mBase64OutputStream =
1403                    new Base64OutputStream(mByteArrayOutputStream, Base64.DEFAULT);
1404            MessageDigest digest = MessageDigest.getInstance("SHA-1");
1405            DigestOutputStream mDigestOutputStream =
1406                    new DigestOutputStream(mBase64OutputStream, digest);
1407            if (!bitmap.compress(format, quality, mDigestOutputStream)) {
1408                return null;
1409            }
1410            mDigestOutputStream.flush();
1411            mDigestOutputStream.close();
1412            long chars = mByteArrayOutputStream.size();
1413            if (format != Bitmap.CompressFormat.PNG
1414                    && quality >= 50
1415                    && chars >= Config.AVATAR_CHAR_LIMIT) {
1416                int q = quality - 2;
1417                Log.d(
1418                        Config.LOGTAG,
1419                        "avatar char length was " + chars + " reducing quality to " + q);
1420                return getPepAvatar(bitmap, format, q);
1421            }
1422            Log.d(Config.LOGTAG, "settled on char length " + chars + " with quality=" + quality);
1423            final Avatar avatar = new Avatar();
1424            avatar.sha1sum = CryptoHelper.bytesToHex(digest.digest());
1425            avatar.image = new String(mByteArrayOutputStream.toByteArray());
1426            if (format.equals(Bitmap.CompressFormat.WEBP)) {
1427                avatar.type = "image/webp";
1428            } else if (format.equals(Bitmap.CompressFormat.JPEG)) {
1429                avatar.type = "image/jpeg";
1430            } else if (format.equals(Bitmap.CompressFormat.PNG)) {
1431                avatar.type = "image/png";
1432            }
1433            avatar.width = bitmap.getWidth();
1434            avatar.height = bitmap.getHeight();
1435            return avatar;
1436        } catch (OutOfMemoryError e) {
1437            Log.d(Config.LOGTAG, "unable to convert avatar to base64 due to low memory");
1438            return null;
1439        } catch (Exception e) {
1440            return null;
1441        }
1442    }
1443
1444    public Avatar getStoredPepAvatar(String hash) {
1445        if (hash == null) {
1446            return null;
1447        }
1448        Avatar avatar = new Avatar();
1449        final File file = getAvatarFile(hash);
1450        FileInputStream is = null;
1451        try {
1452            avatar.size = file.length();
1453            BitmapFactory.Options options = new BitmapFactory.Options();
1454            options.inJustDecodeBounds = true;
1455            BitmapFactory.decodeFile(file.getAbsolutePath(), options);
1456            is = new FileInputStream(file);
1457            ByteArrayOutputStream mByteArrayOutputStream = new ByteArrayOutputStream();
1458            Base64OutputStream mBase64OutputStream =
1459                    new Base64OutputStream(mByteArrayOutputStream, Base64.DEFAULT);
1460            MessageDigest digest = MessageDigest.getInstance("SHA-1");
1461            DigestOutputStream os = new DigestOutputStream(mBase64OutputStream, digest);
1462            byte[] buffer = new byte[4096];
1463            int length;
1464            while ((length = is.read(buffer)) > 0) {
1465                os.write(buffer, 0, length);
1466            }
1467            os.flush();
1468            os.close();
1469            avatar.sha1sum = CryptoHelper.bytesToHex(digest.digest());
1470            avatar.image = new String(mByteArrayOutputStream.toByteArray());
1471            avatar.height = options.outHeight;
1472            avatar.width = options.outWidth;
1473            avatar.type = options.outMimeType;
1474            return avatar;
1475        } catch (NoSuchAlgorithmException | IOException e) {
1476            return null;
1477        } finally {
1478            close(is);
1479        }
1480    }
1481
1482    public boolean isAvatarCached(Avatar avatar) {
1483        final File file = getAvatarFile(avatar.getFilename());
1484        return file.exists();
1485    }
1486
1487    public boolean save(final Avatar avatar) {
1488        File file;
1489        if (isAvatarCached(avatar)) {
1490            file = getAvatarFile(avatar.getFilename());
1491            avatar.size = file.length();
1492        } else {
1493            file =
1494                    new File(
1495                            mXmppConnectionService.getCacheDir().getAbsolutePath()
1496                                    + "/"
1497                                    + UUID.randomUUID().toString());
1498            if (file.getParentFile().mkdirs()) {
1499                Log.d(Config.LOGTAG, "created cache directory");
1500            }
1501            OutputStream os = null;
1502            try {
1503                if (!file.createNewFile()) {
1504                    Log.d(
1505                            Config.LOGTAG,
1506                            "unable to create temporary file " + file.getAbsolutePath());
1507                }
1508                os = new FileOutputStream(file);
1509                MessageDigest digest = MessageDigest.getInstance("SHA-1");
1510                digest.reset();
1511                DigestOutputStream mDigestOutputStream = new DigestOutputStream(os, digest);
1512                final byte[] bytes = avatar.getImageAsBytes();
1513                mDigestOutputStream.write(bytes);
1514                mDigestOutputStream.flush();
1515                mDigestOutputStream.close();
1516                String sha1sum = CryptoHelper.bytesToHex(digest.digest());
1517                if (sha1sum.equals(avatar.sha1sum)) {
1518                    final File outputFile = getAvatarFile(avatar.getFilename());
1519                    if (outputFile.getParentFile().mkdirs()) {
1520                        Log.d(Config.LOGTAG, "created avatar directory");
1521                    }
1522                    final File avatarFile = getAvatarFile(avatar.getFilename());
1523                    if (!file.renameTo(avatarFile)) {
1524                        Log.d(
1525                                Config.LOGTAG,
1526                                "unable to rename " + file.getAbsolutePath() + " to " + outputFile);
1527                        return false;
1528                    }
1529                } else {
1530                    Log.d(Config.LOGTAG, "sha1sum mismatch for " + avatar.owner);
1531                    if (!file.delete()) {
1532                        Log.d(Config.LOGTAG, "unable to delete temporary file");
1533                    }
1534                    return false;
1535                }
1536                avatar.size = bytes.length;
1537            } catch (IllegalArgumentException | IOException | NoSuchAlgorithmException e) {
1538                return false;
1539            } finally {
1540                close(os);
1541            }
1542        }
1543        return true;
1544    }
1545
1546    public void deleteHistoricAvatarPath() {
1547        delete(getHistoricAvatarPath());
1548    }
1549
1550    private void delete(final File file) {
1551        if (file.isDirectory()) {
1552            final File[] files = file.listFiles();
1553            if (files != null) {
1554                for (final File f : files) {
1555                    delete(f);
1556                }
1557            }
1558        }
1559        if (file.delete()) {
1560            Log.d(Config.LOGTAG, "deleted " + file.getAbsolutePath());
1561        }
1562    }
1563
1564    private File getHistoricAvatarPath() {
1565        return new File(mXmppConnectionService.getFilesDir(), "/avatars/");
1566    }
1567
1568    private File getAvatarFile(String avatar) {
1569        return new File(mXmppConnectionService.getCacheDir(), "/avatars/" + avatar);
1570    }
1571
1572    public Uri getAvatarUri(String avatar) {
1573        return Uri.fromFile(getAvatarFile(avatar));
1574    }
1575
1576    public Bitmap cropCenterSquare(Uri image, int size) {
1577        if (image == null) {
1578            return null;
1579        }
1580        InputStream is = null;
1581        try {
1582            BitmapFactory.Options options = new BitmapFactory.Options();
1583            options.inSampleSize = calcSampleSize(image, size);
1584            is = mXmppConnectionService.getContentResolver().openInputStream(image);
1585            if (is == null) {
1586                return null;
1587            }
1588            Bitmap input = BitmapFactory.decodeStream(is, null, options);
1589            if (input == null) {
1590                return null;
1591            } else {
1592                input = rotate(input, getRotation(image));
1593                return cropCenterSquare(input, size);
1594            }
1595        } catch (FileNotFoundException | SecurityException e) {
1596            Log.d(Config.LOGTAG, "unable to open file " + image.toString(), e);
1597            return null;
1598        } finally {
1599            close(is);
1600        }
1601    }
1602
1603    public Bitmap cropCenter(Uri image, int newHeight, int newWidth) {
1604        if (image == null) {
1605            return null;
1606        }
1607        InputStream is = null;
1608        try {
1609            BitmapFactory.Options options = new BitmapFactory.Options();
1610            options.inSampleSize = calcSampleSize(image, Math.max(newHeight, newWidth));
1611            is = mXmppConnectionService.getContentResolver().openInputStream(image);
1612            if (is == null) {
1613                return null;
1614            }
1615            Bitmap source = BitmapFactory.decodeStream(is, null, options);
1616            if (source == null) {
1617                return null;
1618            }
1619            int sourceWidth = source.getWidth();
1620            int sourceHeight = source.getHeight();
1621            float xScale = (float) newWidth / sourceWidth;
1622            float yScale = (float) newHeight / sourceHeight;
1623            float scale = Math.max(xScale, yScale);
1624            float scaledWidth = scale * sourceWidth;
1625            float scaledHeight = scale * sourceHeight;
1626            float left = (newWidth - scaledWidth) / 2;
1627            float top = (newHeight - scaledHeight) / 2;
1628
1629            RectF targetRect = new RectF(left, top, left + scaledWidth, top + scaledHeight);
1630            Bitmap dest = Bitmap.createBitmap(newWidth, newHeight, Bitmap.Config.ARGB_8888);
1631            Canvas canvas = new Canvas(dest);
1632            canvas.drawBitmap(source, null, targetRect, createAntiAliasingPaint());
1633            if (source.isRecycled()) {
1634                source.recycle();
1635            }
1636            return dest;
1637        } catch (SecurityException e) {
1638            return null; // android 6.0 with revoked permissions for example
1639        } catch (FileNotFoundException e) {
1640            return null;
1641        } finally {
1642            close(is);
1643        }
1644    }
1645
1646    public Bitmap cropCenterSquare(Bitmap input, int size) {
1647        int w = input.getWidth();
1648        int h = input.getHeight();
1649
1650        float scale = Math.max((float) size / h, (float) size / w);
1651
1652        float outWidth = scale * w;
1653        float outHeight = scale * h;
1654        float left = (size - outWidth) / 2;
1655        float top = (size - outHeight) / 2;
1656        RectF target = new RectF(left, top, left + outWidth, top + outHeight);
1657
1658        Bitmap output = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
1659        Canvas canvas = new Canvas(output);
1660        canvas.drawBitmap(input, null, target, createAntiAliasingPaint());
1661        if (!input.isRecycled()) {
1662            input.recycle();
1663        }
1664        return output;
1665    }
1666
1667    private int calcSampleSize(Uri image, int size)
1668            throws FileNotFoundException, SecurityException {
1669        final BitmapFactory.Options options = new BitmapFactory.Options();
1670        options.inJustDecodeBounds = true;
1671        final InputStream inputStream =
1672                mXmppConnectionService.getContentResolver().openInputStream(image);
1673        BitmapFactory.decodeStream(inputStream, null, options);
1674        close(inputStream);
1675        return calcSampleSize(options, size);
1676    }
1677
1678    public void updateFileParams(Message message) {
1679        updateFileParams(message, null);
1680    }
1681
1682    public void updateFileParams(final Message message, final String url) {
1683        updateFileParams(message, url, true);
1684    }
1685
1686    public void updateFileParams(final Message message, final String url, boolean updateCids) {
1687        final boolean encrypted =
1688                message.getEncryption() == Message.ENCRYPTION_PGP
1689                        || message.getEncryption() == Message.ENCRYPTION_DECRYPTED;
1690        final DownloadableFile file = getFile(message);
1691        final String mime = file.getMimeType();
1692        final boolean privateMessage = message.isPrivateMessage();
1693        final boolean image =
1694                message.getType() == Message.TYPE_IMAGE
1695                        || (mime != null && mime.startsWith("image/"));
1696        Message.FileParams fileParams = new Message.FileParams();
1697        if (url != null) {
1698            fileParams.url = url;
1699        }
1700        if (encrypted && !file.exists()) {
1701            Log.d(Config.LOGTAG, "skipping updateFileParams because file is encrypted");
1702            final DownloadableFile encryptedFile = getFile(message, false);
1703            fileParams.size = encryptedFile.getSize();
1704        } else {
1705            Log.d(Config.LOGTAG, "running updateFileParams");
1706            final boolean ambiguous = MimeUtils.AMBIGUOUS_CONTAINER_FORMATS.contains(mime);
1707            final boolean video = mime != null && mime.startsWith("video/");
1708            final boolean audio = mime != null && mime.startsWith("audio/");
1709            final boolean pdf = "application/pdf".equals(mime);
1710            fileParams.size = file.getSize();
1711            if (ambiguous) {
1712                try {
1713                    final Dimensions dimensions = getVideoDimensions(file);
1714                    if (dimensions.valid()) {
1715                        Log.d(Config.LOGTAG, "ambiguous file " + mime + " is video");
1716                        fileParams.width = dimensions.width;
1717                        fileParams.height = dimensions.height;
1718                    } else {
1719                        Log.d(Config.LOGTAG, "ambiguous file " + mime + " is audio");
1720                        fileParams.runtime = getMediaRuntime(file);
1721                    }
1722                } catch (final NotAVideoFile e) {
1723                    Log.d(Config.LOGTAG, "ambiguous file " + mime + " is audio");
1724                    fileParams.runtime = getMediaRuntime(file);
1725                }
1726            } else if (image || video || pdf) {
1727                try {
1728                    final Dimensions dimensions;
1729                    if (video) {
1730                        dimensions = getVideoDimensions(file);
1731                    } else if (pdf) {
1732                        dimensions = getPdfDocumentDimensions(file);
1733                    } else {
1734                        dimensions = getImageDimensions(file);
1735                    }
1736                    if (dimensions.valid()) {
1737                        fileParams.width = dimensions.width;
1738                        fileParams.height = dimensions.height;
1739                    }
1740                } catch (NotAVideoFile notAVideoFile) {
1741                    Log.d(
1742                            Config.LOGTAG,
1743                            "file with mime type " + file.getMimeType() + " was not a video file");
1744                    // fall threw
1745                }
1746            } else if (audio) {
1747                fileParams.runtime = getMediaRuntime(file);
1748            }
1749        }
1750        message.setFileParams(fileParams);
1751        message.setDeleted(false);
1752        message.setType(
1753                privateMessage
1754                        ? Message.TYPE_PRIVATE_FILE
1755                        : (image ? Message.TYPE_IMAGE : Message.TYPE_FILE));
1756
1757        if (updateCids) {
1758            try {
1759                Cid[] cids = calculateCids(new FileInputStream(getFile(message)));
1760                for (int i = 0; i < cids.length; i++) {
1761                    mXmppConnectionService.saveCid(cids[i], file);
1762                }
1763            } catch (final IOException e) { }
1764        }
1765    }
1766
1767    private int getMediaRuntime(final File file) {
1768        try {
1769            final MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever();
1770            mediaMetadataRetriever.setDataSource(file.toString());
1771            final String value =
1772                    mediaMetadataRetriever.extractMetadata(
1773                            MediaMetadataRetriever.METADATA_KEY_DURATION);
1774            if (Strings.isNullOrEmpty(value)) {
1775                return 0;
1776            }
1777            return Integer.parseInt(value);
1778        } catch (final Exception e) {
1779            return 0;
1780        }
1781    }
1782
1783    private Dimensions getImageDimensions(File file) {
1784        final BitmapFactory.Options options = new BitmapFactory.Options();
1785        options.inJustDecodeBounds = true;
1786        BitmapFactory.decodeFile(file.getAbsolutePath(), options);
1787        final int rotation = getRotation(file);
1788        final boolean rotated = rotation == 90 || rotation == 270;
1789        final int imageHeight = rotated ? options.outWidth : options.outHeight;
1790        final int imageWidth = rotated ? options.outHeight : options.outWidth;
1791        return new Dimensions(imageHeight, imageWidth);
1792    }
1793
1794    private Dimensions getVideoDimensions(File file) throws NotAVideoFile {
1795        MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever();
1796        try {
1797            metadataRetriever.setDataSource(file.getAbsolutePath());
1798        } catch (RuntimeException e) {
1799            throw new NotAVideoFile(e);
1800        }
1801        return getVideoDimensions(metadataRetriever);
1802    }
1803
1804    private Dimensions getPdfDocumentDimensions(final File file) {
1805        final ParcelFileDescriptor fileDescriptor;
1806        try {
1807            fileDescriptor = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
1808            if (fileDescriptor == null) {
1809                return new Dimensions(0, 0);
1810            }
1811        } catch (final FileNotFoundException e) {
1812            return new Dimensions(0, 0);
1813        }
1814        try {
1815            final PdfRenderer pdfRenderer = new PdfRenderer(fileDescriptor);
1816            final PdfRenderer.Page page = pdfRenderer.openPage(0);
1817            final int height = page.getHeight();
1818            final int width = page.getWidth();
1819            page.close();
1820            pdfRenderer.close();
1821            return scalePdfDimensions(new Dimensions(height, width));
1822        } catch (final IOException | SecurityException e) {
1823            Log.d(Config.LOGTAG, "unable to get dimensions for pdf document", e);
1824            return new Dimensions(0, 0);
1825        }
1826    }
1827
1828    private Dimensions scalePdfDimensions(Dimensions in) {
1829        final DisplayMetrics displayMetrics =
1830                mXmppConnectionService.getResources().getDisplayMetrics();
1831        final int target = (int) (displayMetrics.density * 288);
1832        return scalePdfDimensions(in, target, true);
1833    }
1834
1835    private static Dimensions scalePdfDimensions(
1836            final Dimensions in, final int target, final boolean fit) {
1837        final int w, h;
1838        if (fit == (in.width <= in.height)) {
1839            w = Math.max((int) (in.width / ((double) in.height / target)), 1);
1840            h = target;
1841        } else {
1842            w = target;
1843            h = Math.max((int) (in.height / ((double) in.width / target)), 1);
1844        }
1845        return new Dimensions(h, w);
1846    }
1847
1848    public Bitmap getAvatar(String avatar, int size) {
1849        if (avatar == null) {
1850            return null;
1851        }
1852        Bitmap bm = cropCenter(getAvatarUri(avatar), size, size);
1853        return bm;
1854    }
1855
1856    private static class Dimensions {
1857        public final int width;
1858        public final int height;
1859
1860        Dimensions(int height, int width) {
1861            this.width = width;
1862            this.height = height;
1863        }
1864
1865        public int getMin() {
1866            return Math.min(width, height);
1867        }
1868
1869        public boolean valid() {
1870            return width > 0 && height > 0;
1871        }
1872    }
1873
1874    private static class NotAVideoFile extends Exception {
1875        public NotAVideoFile(Throwable t) {
1876            super(t);
1877        }
1878
1879        public NotAVideoFile() {
1880            super();
1881        }
1882    }
1883
1884    public static class ImageCompressionException extends Exception {
1885
1886        ImageCompressionException(String message) {
1887            super(message);
1888        }
1889    }
1890
1891    public static class FileCopyException extends Exception {
1892        private final int resId;
1893
1894        private FileCopyException(@StringRes int resId) {
1895            this.resId = resId;
1896        }
1897
1898        public @StringRes int getResId() {
1899            return resId;
1900        }
1901    }
1902}