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