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