1package eu.siacs.conversations.persistance;
   2
   3import android.annotation.TargetApi;
   4import android.content.ContentResolver;
   5import android.content.Context;
   6import android.content.Intent;
   7import android.database.Cursor;
   8import android.graphics.Bitmap;
   9import android.graphics.BitmapFactory;
  10import android.graphics.Canvas;
  11import android.graphics.Color;
  12import android.graphics.Matrix;
  13import android.graphics.Paint;
  14import android.graphics.RectF;
  15import android.media.MediaMetadataRetriever;
  16import android.net.Uri;
  17import android.os.Build;
  18import android.os.Environment;
  19import android.os.ParcelFileDescriptor;
  20import android.provider.MediaStore;
  21import android.provider.OpenableColumns;
  22import android.support.v4.content.FileProvider;
  23import android.system.Os;
  24import android.system.StructStat;
  25import android.util.Base64;
  26import android.util.Base64OutputStream;
  27import android.util.Log;
  28import android.util.LruCache;
  29import android.webkit.MimeTypeMap;
  30
  31import java.io.ByteArrayOutputStream;
  32import java.io.Closeable;
  33import java.io.File;
  34import java.io.FileDescriptor;
  35import java.io.FileInputStream;
  36import java.io.FileNotFoundException;
  37import java.io.FileOutputStream;
  38import java.io.IOException;
  39import java.io.InputStream;
  40import java.io.OutputStream;
  41import java.net.Socket;
  42import java.net.URL;
  43import java.security.DigestOutputStream;
  44import java.security.MessageDigest;
  45import java.security.NoSuchAlgorithmException;
  46import java.text.SimpleDateFormat;
  47import java.util.Arrays;
  48import java.util.Date;
  49import java.util.List;
  50import java.util.Locale;
  51import java.util.UUID;
  52
  53import eu.siacs.conversations.Config;
  54import eu.siacs.conversations.R;
  55import eu.siacs.conversations.entities.DownloadableFile;
  56import eu.siacs.conversations.entities.Message;
  57import eu.siacs.conversations.services.XmppConnectionService;
  58import eu.siacs.conversations.utils.CryptoHelper;
  59import eu.siacs.conversations.utils.ExifHelper;
  60import eu.siacs.conversations.utils.FileUtils;
  61import eu.siacs.conversations.utils.FileWriterException;
  62import eu.siacs.conversations.utils.MimeUtils;
  63import eu.siacs.conversations.xmpp.pep.Avatar;
  64
  65public class FileBackend {
  66
  67	private static final Object THUMBNAIL_LOCK = new Object();
  68
  69	private static final SimpleDateFormat IMAGE_DATE_FORMAT = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US);
  70
  71	public static final String FILE_PROVIDER = ".files";
  72
  73	private XmppConnectionService mXmppConnectionService;
  74
  75	private static final List<String> BLACKLISTED_PATH_ELEMENTS = Arrays.asList("org.mozilla.firefox");
  76
  77	public FileBackend(XmppConnectionService service) {
  78		this.mXmppConnectionService = service;
  79	}
  80
  81	private void createNoMedia() {
  82		final File nomedia = new File(getConversationsDirectory("Files") + ".nomedia");
  83		if (!nomedia.exists()) {
  84			try {
  85				nomedia.createNewFile();
  86			} catch (Exception e) {
  87				Log.d(Config.LOGTAG, "could not create nomedia file");
  88			}
  89		}
  90	}
  91
  92	public void updateMediaScanner(File file) {
  93		String path = file.getAbsolutePath();
  94		if (!path.startsWith(getConversationsDirectory("Files"))) {
  95			Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
  96			intent.setData(Uri.fromFile(file));
  97			mXmppConnectionService.sendBroadcast(intent);
  98		} else {
  99			createNoMedia();
 100		}
 101	}
 102
 103	public boolean deleteFile(Message message) {
 104		File file = getFile(message);
 105		if (file.delete()) {
 106			updateMediaScanner(file);
 107			return true;
 108		} else {
 109			return false;
 110		}
 111	}
 112
 113	public DownloadableFile getFile(Message message) {
 114		return getFile(message, true);
 115	}
 116
 117	public DownloadableFile getFileForPath(String path, String mime) {
 118		final DownloadableFile file;
 119		if (path.startsWith("/")) {
 120			file = new DownloadableFile(path);
 121		} else {
 122			if (mime != null && mime.startsWith("image/")) {
 123				file = new DownloadableFile(getConversationsDirectory("Images") + path);
 124			} else if (mime != null && mime.startsWith("video/")) {
 125				file = new DownloadableFile(getConversationsDirectory("Videos") + path);
 126			} else {
 127				file = new DownloadableFile(getConversationsDirectory("Files") + path);
 128			}
 129		}
 130		return file;
 131	}
 132
 133	public DownloadableFile getFile(Message message, boolean decrypted) {
 134		final boolean encrypted = !decrypted
 135				&& (message.getEncryption() == Message.ENCRYPTION_PGP
 136				|| message.getEncryption() == Message.ENCRYPTION_DECRYPTED);
 137		String path = message.getRelativeFilePath();
 138		if (path == null) {
 139			path = message.getUuid();
 140		}
 141		final DownloadableFile file = getFileForPath(path, message.getMimeType());
 142		if (encrypted) {
 143			return new DownloadableFile(getConversationsDirectory("Files") + file.getName() + ".pgp");
 144		} else {
 145			return file;
 146		}
 147	}
 148
 149	public static long getFileSize(Context context, Uri uri) {
 150		try {
 151			final Cursor cursor = context.getContentResolver().query(uri, null, null, null, null);
 152			if (cursor != null && cursor.moveToFirst()) {
 153				long size = cursor.getLong(cursor.getColumnIndex(OpenableColumns.SIZE));
 154				cursor.close();
 155				return size;
 156			} else {
 157				return -1;
 158			}
 159		} catch (Exception e) {
 160			return -1;
 161		}
 162	}
 163
 164	public static boolean allFilesUnderSize(Context context, List<Uri> uris, long max) {
 165		if (max <= 0) {
 166			Log.d(Config.LOGTAG, "server did not report max file size for http upload");
 167			return true; //exception to be compatible with HTTP Upload < v0.2
 168		}
 169		for (Uri uri : uris) {
 170			String mime = context.getContentResolver().getType(uri);
 171			if (mime != null && mime.startsWith("video/")) {
 172				try {
 173					Dimensions dimensions = FileBackend.getVideoDimensions(context, uri);
 174					if (dimensions.getMin() > 720) {
 175						Log.d(Config.LOGTAG, "do not consider video file with min width larger than 720 for size check");
 176						continue;
 177					}
 178				} catch (NotAVideoFile notAVideoFile) {
 179					//ignore and fall through
 180				}
 181			}
 182			if (FileBackend.getFileSize(context, uri) > max) {
 183				Log.d(Config.LOGTAG, "not all files are under " + max + " bytes. suggesting falling back to jingle");
 184				return false;
 185			}
 186		}
 187		return true;
 188	}
 189
 190	public String getConversationsDirectory(final String type) {
 191		if (Config.ONLY_INTERNAL_STORAGE) {
 192			return mXmppConnectionService.getFilesDir().getAbsolutePath() + "/" + type + "/";
 193		} else {
 194			return Environment.getExternalStorageDirectory() + "/Conversations/Media/Conversations " + type + "/";
 195		}
 196	}
 197
 198	public static String getConversationsLogsDirectory() {
 199		return Environment.getExternalStorageDirectory().getAbsolutePath() + "/Conversations/";
 200	}
 201
 202	public Bitmap resize(Bitmap originalBitmap, int size) {
 203		int w = originalBitmap.getWidth();
 204		int h = originalBitmap.getHeight();
 205		if (Math.max(w, h) > size) {
 206			int scalledW;
 207			int scalledH;
 208			if (w <= h) {
 209				scalledW = (int) (w / ((double) h / size));
 210				scalledH = size;
 211			} else {
 212				scalledW = size;
 213				scalledH = (int) (h / ((double) w / size));
 214			}
 215			Bitmap result = Bitmap.createScaledBitmap(originalBitmap, scalledW, scalledH, true);
 216			if (originalBitmap != null && !originalBitmap.isRecycled()) {
 217				originalBitmap.recycle();
 218			}
 219			return result;
 220		} else {
 221			return originalBitmap;
 222		}
 223	}
 224
 225	public static Bitmap rotate(Bitmap bitmap, int degree) {
 226		if (degree == 0) {
 227			return bitmap;
 228		}
 229		int w = bitmap.getWidth();
 230		int h = bitmap.getHeight();
 231		Matrix mtx = new Matrix();
 232		mtx.postRotate(degree);
 233		Bitmap result = Bitmap.createBitmap(bitmap, 0, 0, w, h, mtx, true);
 234		if (bitmap != null && !bitmap.isRecycled()) {
 235			bitmap.recycle();
 236		}
 237		return result;
 238	}
 239
 240
 241
 242
 243	public boolean useImageAsIs(Uri uri) {
 244		String path = getOriginalPath(uri);
 245		if (path == null || isPathBlacklisted(path)) {
 246			return false;
 247		}
 248		File file = new File(path);
 249		long size = file.length();
 250		if (size == 0 || size >= mXmppConnectionService.getResources().getInteger(R.integer.auto_accept_filesize)) {
 251			return false;
 252		}
 253		BitmapFactory.Options options = new BitmapFactory.Options();
 254		options.inJustDecodeBounds = true;
 255		try {
 256			BitmapFactory.decodeStream(mXmppConnectionService.getContentResolver().openInputStream(uri), null, options);
 257			if (options.outMimeType == null || options.outHeight <= 0 || options.outWidth <= 0) {
 258				return false;
 259			}
 260			return (options.outWidth <= Config.IMAGE_SIZE && options.outHeight <= Config.IMAGE_SIZE && options.outMimeType.contains(Config.IMAGE_FORMAT.name().toLowerCase()));
 261		} catch (FileNotFoundException e) {
 262			return false;
 263		}
 264	}
 265
 266	public static boolean isPathBlacklisted(String path) {
 267		for(String element : BLACKLISTED_PATH_ELEMENTS) {
 268			if (path.contains(element)) {
 269				return true;
 270			}
 271		}
 272		return false;
 273	}
 274
 275	public String getOriginalPath(Uri uri) {
 276		return FileUtils.getPath(mXmppConnectionService, uri);
 277	}
 278
 279	public void copyFileToPrivateStorage(File file, Uri uri) throws FileCopyException {
 280		Log.d(Config.LOGTAG, "copy file (" + uri.toString() + ") to private storage " + file.getAbsolutePath());
 281		file.getParentFile().mkdirs();
 282		OutputStream os = null;
 283		InputStream is = null;
 284		try {
 285			file.createNewFile();
 286			os = new FileOutputStream(file);
 287			is = mXmppConnectionService.getContentResolver().openInputStream(uri);
 288			byte[] buffer = new byte[1024];
 289			int length;
 290			while ((length = is.read(buffer)) > 0) {
 291				try {
 292					os.write(buffer, 0, length);
 293				} catch (IOException e) {
 294					throw new FileWriterException();
 295				}
 296			}
 297			try {
 298				os.flush();
 299			} catch (IOException e) {
 300				throw new FileWriterException();
 301			}
 302		} catch (FileNotFoundException e) {
 303			throw new FileCopyException(R.string.error_file_not_found);
 304		} catch (FileWriterException e) {
 305			throw new FileCopyException(R.string.error_unable_to_create_temporary_file);
 306		} catch (IOException e) {
 307			e.printStackTrace();
 308			throw new FileCopyException(R.string.error_io_exception);
 309		} finally {
 310			close(os);
 311			close(is);
 312		}
 313	}
 314
 315	public void copyFileToPrivateStorage(Message message, Uri uri, String type) throws FileCopyException {
 316		String mime = type != null ? type : MimeUtils.guessMimeTypeFromUri(mXmppConnectionService, uri);
 317		Log.d(Config.LOGTAG, "copy " + uri.toString() + " to private storage (mime=" + mime + ")");
 318		String extension = MimeUtils.guessExtensionFromMimeType(mime);
 319		if (extension == null) {
 320			extension = getExtensionFromUri(uri);
 321		}
 322		message.setRelativeFilePath(message.getUuid() + "." + extension);
 323		copyFileToPrivateStorage(mXmppConnectionService.getFileBackend().getFile(message), uri);
 324	}
 325
 326	private String getExtensionFromUri(Uri uri) {
 327		String[] projection = {MediaStore.MediaColumns.DATA};
 328		String filename = null;
 329		Cursor cursor = mXmppConnectionService.getContentResolver().query(uri, projection, null, null, null);
 330		if (cursor != null) {
 331			try {
 332				if (cursor.moveToFirst()) {
 333					filename = cursor.getString(0);
 334				}
 335			} catch (Exception e) {
 336				filename = null;
 337			} finally {
 338				cursor.close();
 339			}
 340		}
 341		int pos = filename == null ? -1 : filename.lastIndexOf('.');
 342		return pos > 0 ? filename.substring(pos + 1) : null;
 343	}
 344
 345	private void copyImageToPrivateStorage(File file, Uri image, int sampleSize) throws FileCopyException {
 346		file.getParentFile().mkdirs();
 347		InputStream is = null;
 348		OutputStream os = null;
 349		try {
 350			if (!file.exists() && !file.createNewFile()) {
 351				throw new FileCopyException(R.string.error_unable_to_create_temporary_file);
 352			}
 353			is = mXmppConnectionService.getContentResolver().openInputStream(image);
 354			if (is == null) {
 355				throw new FileCopyException(R.string.error_not_an_image_file);
 356			}
 357			Bitmap originalBitmap;
 358			BitmapFactory.Options options = new BitmapFactory.Options();
 359			int inSampleSize = (int) Math.pow(2, sampleSize);
 360			Log.d(Config.LOGTAG, "reading bitmap with sample size " + inSampleSize);
 361			options.inSampleSize = inSampleSize;
 362			originalBitmap = BitmapFactory.decodeStream(is, null, options);
 363			is.close();
 364			if (originalBitmap == null) {
 365				throw new FileCopyException(R.string.error_not_an_image_file);
 366			}
 367			Bitmap scaledBitmap = resize(originalBitmap, Config.IMAGE_SIZE);
 368			int rotation = getRotation(image);
 369			scaledBitmap = rotate(scaledBitmap, rotation);
 370			boolean targetSizeReached = false;
 371			int quality = Config.IMAGE_QUALITY;
 372			final int imageMaxSize = mXmppConnectionService.getResources().getInteger(R.integer.auto_accept_filesize);
 373			while (!targetSizeReached) {
 374				os = new FileOutputStream(file);
 375				boolean success = scaledBitmap.compress(Config.IMAGE_FORMAT, quality, os);
 376				if (!success) {
 377					throw new FileCopyException(R.string.error_compressing_image);
 378				}
 379				os.flush();
 380				targetSizeReached = file.length() <= imageMaxSize || quality <= 50;
 381				quality -= 5;
 382			}
 383			scaledBitmap.recycle();
 384		} catch (FileNotFoundException e) {
 385			throw new FileCopyException(R.string.error_file_not_found);
 386		} catch (IOException e) {
 387			e.printStackTrace();
 388			throw new FileCopyException(R.string.error_io_exception);
 389		} catch (SecurityException e) {
 390			throw new FileCopyException(R.string.error_security_exception_during_image_copy);
 391		} catch (OutOfMemoryError e) {
 392			++sampleSize;
 393			if (sampleSize <= 3) {
 394				copyImageToPrivateStorage(file, image, sampleSize);
 395			} else {
 396				throw new FileCopyException(R.string.error_out_of_memory);
 397			}
 398		} finally {
 399			close(os);
 400			close(is);
 401		}
 402	}
 403
 404	public void copyImageToPrivateStorage(File file, Uri image) throws FileCopyException {
 405		Log.d(Config.LOGTAG, "copy image (" + image.toString() + ") to private storage " + file.getAbsolutePath());
 406		copyImageToPrivateStorage(file, image, 0);
 407	}
 408
 409	public void copyImageToPrivateStorage(Message message, Uri image) throws FileCopyException {
 410		switch (Config.IMAGE_FORMAT) {
 411			case JPEG:
 412				message.setRelativeFilePath(message.getUuid() + ".jpg");
 413				break;
 414			case PNG:
 415				message.setRelativeFilePath(message.getUuid() + ".png");
 416				break;
 417			case WEBP:
 418				message.setRelativeFilePath(message.getUuid() + ".webp");
 419				break;
 420		}
 421		copyImageToPrivateStorage(getFile(message), image);
 422		updateFileParams(message);
 423	}
 424
 425	private int getRotation(File file) {
 426		return getRotation(Uri.parse("file://" + file.getAbsolutePath()));
 427	}
 428
 429	private int getRotation(Uri image) {
 430		InputStream is = null;
 431		try {
 432			is = mXmppConnectionService.getContentResolver().openInputStream(image);
 433			return ExifHelper.getOrientation(is);
 434		} catch (FileNotFoundException e) {
 435			return 0;
 436		} finally {
 437			close(is);
 438		}
 439	}
 440
 441	public Bitmap getThumbnail(Message message, int size, boolean cacheOnly) throws FileNotFoundException {
 442		final String uuid = message.getUuid();
 443		final LruCache<String, Bitmap> cache = mXmppConnectionService.getBitmapCache();
 444		Bitmap thumbnail = cache.get(uuid);
 445		if ((thumbnail == null) && (!cacheOnly)) {
 446			synchronized (THUMBNAIL_LOCK) {
 447				thumbnail = cache.get(uuid);
 448				if (thumbnail != null) {
 449					return thumbnail;
 450				}
 451				DownloadableFile file = getFile(message);
 452				final String mime = file.getMimeType();
 453				if (mime.startsWith("video/")) {
 454					thumbnail = getVideoPreview(file, size);
 455				} else {
 456					Bitmap fullsize = getFullsizeImagePreview(file, size);
 457					if (fullsize == null) {
 458						throw new FileNotFoundException();
 459					}
 460					thumbnail = resize(fullsize, size);
 461					thumbnail = rotate(thumbnail, getRotation(file));
 462					if (mime.equals("image/gif")) {
 463						Bitmap withGifOverlay = thumbnail.copy(Bitmap.Config.ARGB_8888, true);
 464						drawOverlay(withGifOverlay, R.drawable.play_gif, 1.0f);
 465						thumbnail.recycle();
 466						thumbnail = withGifOverlay;
 467					}
 468				}
 469				this.mXmppConnectionService.getBitmapCache().put(uuid, thumbnail);
 470			}
 471		}
 472		return thumbnail;
 473	}
 474
 475	private Bitmap getFullsizeImagePreview(File file, int size) {
 476		BitmapFactory.Options options = new BitmapFactory.Options();
 477		options.inSampleSize = calcSampleSize(file, size);
 478		try {
 479			return BitmapFactory.decodeFile(file.getAbsolutePath(), options);
 480		} catch (OutOfMemoryError e) {
 481			options.inSampleSize *= 2;
 482			return BitmapFactory.decodeFile(file.getAbsolutePath(), options);
 483		}
 484	}
 485
 486	private void drawOverlay(Bitmap bitmap, int resource, float factor) {
 487		Bitmap overlay = BitmapFactory.decodeResource(mXmppConnectionService.getResources(), resource);
 488		Canvas canvas = new Canvas(bitmap);
 489		float targetSize = Math.min(canvas.getWidth(), canvas.getHeight()) * factor;
 490		Log.d(Config.LOGTAG, "target size overlay: " + targetSize + " overlay bitmap size was " + overlay.getHeight());
 491		float left = (canvas.getWidth() - targetSize) / 2.0f;
 492		float top = (canvas.getHeight() - targetSize) / 2.0f;
 493		RectF dst = new RectF(left, top, left + targetSize - 1, top + targetSize - 1);
 494		canvas.drawBitmap(overlay, null, dst, createAntiAliasingPaint());
 495	}
 496
 497	private static Paint createAntiAliasingPaint() {
 498		Paint paint = new Paint();
 499		paint.setAntiAlias(true);
 500		paint.setFilterBitmap(true);
 501		paint.setDither(true);
 502		return paint;
 503	}
 504
 505	private Bitmap getVideoPreview(File file, int size) {
 506		MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever();
 507		Bitmap frame;
 508		try {
 509			metadataRetriever.setDataSource(file.getAbsolutePath());
 510			frame = metadataRetriever.getFrameAtTime(0);
 511			metadataRetriever.release();
 512			frame = resize(frame, size);
 513		} catch (RuntimeException e) {
 514			frame = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
 515			frame.eraseColor(0xff000000);
 516		}
 517		drawOverlay(frame, R.drawable.play_video, 0.75f);
 518		return frame;
 519	}
 520
 521	private static String getTakePhotoPath() {
 522		return Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM) + "/Camera/";
 523	}
 524
 525	public Uri getTakePhotoUri() {
 526		File file;
 527		if (Config.ONLY_INTERNAL_STORAGE) {
 528			file = new File(mXmppConnectionService.getCacheDir().getAbsolutePath(), "Camera/IMG_" + this.IMAGE_DATE_FORMAT.format(new Date()) + ".jpg");
 529		} else {
 530			file = new File(getTakePhotoPath() + "IMG_" + this.IMAGE_DATE_FORMAT.format(new Date()) + ".jpg");
 531		}
 532		file.getParentFile().mkdirs();
 533		return getUriForFile(mXmppConnectionService, file);
 534	}
 535
 536	public static Uri getUriForFile(Context context, File file) {
 537		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N || Config.ONLY_INTERNAL_STORAGE) {
 538			try {
 539				String packageId = context.getPackageName();
 540				return FileProvider.getUriForFile(context, packageId + FILE_PROVIDER, file);
 541			} catch (IllegalArgumentException e) {
 542				if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
 543					throw new SecurityException(e);
 544				} else {
 545					return Uri.fromFile(file);
 546				}
 547			}
 548		} else {
 549			return Uri.fromFile(file);
 550		}
 551	}
 552
 553	public static Uri getIndexableTakePhotoUri(Uri original) {
 554		if (Config.ONLY_INTERNAL_STORAGE || "file".equals(original.getScheme())) {
 555			return original;
 556		} else {
 557			List<String> segments = original.getPathSegments();
 558			return Uri.parse("file://" + getTakePhotoPath() + segments.get(segments.size() - 1));
 559		}
 560	}
 561
 562	public Avatar getPepAvatar(Uri image, int size, Bitmap.CompressFormat format) {
 563		Bitmap bm = cropCenterSquare(image, size);
 564		if (bm == null) {
 565			return null;
 566		}
 567		if (hasAlpha(bm)) {
 568			Log.d(Config.LOGTAG,"alpha in avatar detected; uploading as PNG");
 569			bm.recycle();
 570			bm = cropCenterSquare(image, 96);
 571			return getPepAvatar(bm, Bitmap.CompressFormat.PNG, 100);
 572		}
 573		return getPepAvatar(bm, format, 100);
 574	}
 575
 576	private static boolean hasAlpha(final Bitmap bitmap) {
 577		for(int x = 0; x < bitmap.getWidth(); ++x) {
 578			for(int y = 0; y < bitmap.getWidth(); ++y) {
 579				if (Color.alpha(bitmap.getPixel(x,y)) < 255) {
 580					return true;
 581				}
 582			}
 583		}
 584		return false;
 585	}
 586
 587	private Avatar getPepAvatar(Bitmap bitmap, Bitmap.CompressFormat format, int quality) {
 588		try {
 589			ByteArrayOutputStream mByteArrayOutputStream = new ByteArrayOutputStream();
 590			Base64OutputStream mBase64OutputStream = new Base64OutputStream(mByteArrayOutputStream, Base64.DEFAULT);
 591			MessageDigest digest = MessageDigest.getInstance("SHA-1");
 592			DigestOutputStream mDigestOutputStream = new DigestOutputStream(mBase64OutputStream, digest);
 593			if (!bitmap.compress(format, quality, mDigestOutputStream)) {
 594				return null;
 595			}
 596			mDigestOutputStream.flush();
 597			mDigestOutputStream.close();
 598			long chars = mByteArrayOutputStream.size();
 599			if (format != Bitmap.CompressFormat.PNG && quality >= 50 && chars >= Config.AVATAR_CHAR_LIMIT) {
 600				int q = quality - 2;
 601				Log.d(Config.LOGTAG, "avatar char length was " + chars + " reducing quality to " + q);
 602				return getPepAvatar(bitmap, format, q);
 603			}
 604			Log.d(Config.LOGTAG, "settled on char length " + chars + " with quality=" + quality);
 605			final Avatar avatar = new Avatar();
 606			avatar.sha1sum = CryptoHelper.bytesToHex(digest.digest());
 607			avatar.image = new String(mByteArrayOutputStream.toByteArray());
 608			if (format.equals(Bitmap.CompressFormat.WEBP)) {
 609				avatar.type = "image/webp";
 610			} else if (format.equals(Bitmap.CompressFormat.JPEG)) {
 611				avatar.type = "image/jpeg";
 612			} else if (format.equals(Bitmap.CompressFormat.PNG)) {
 613				avatar.type = "image/png";
 614			}
 615			avatar.width = bitmap.getWidth();
 616			avatar.height = bitmap.getHeight();
 617			return avatar;
 618		} catch (Exception e) {
 619			return null;
 620		}
 621	}
 622
 623	public Avatar getStoredPepAvatar(String hash) {
 624		if (hash == null) {
 625			return null;
 626		}
 627		Avatar avatar = new Avatar();
 628		File file = new File(getAvatarPath(hash));
 629		FileInputStream is = null;
 630		try {
 631			avatar.size = file.length();
 632			BitmapFactory.Options options = new BitmapFactory.Options();
 633			options.inJustDecodeBounds = true;
 634			BitmapFactory.decodeFile(file.getAbsolutePath(), options);
 635			is = new FileInputStream(file);
 636			ByteArrayOutputStream mByteArrayOutputStream = new ByteArrayOutputStream();
 637			Base64OutputStream mBase64OutputStream = new Base64OutputStream(mByteArrayOutputStream, Base64.DEFAULT);
 638			MessageDigest digest = MessageDigest.getInstance("SHA-1");
 639			DigestOutputStream os = new DigestOutputStream(mBase64OutputStream, digest);
 640			byte[] buffer = new byte[4096];
 641			int length;
 642			while ((length = is.read(buffer)) > 0) {
 643				os.write(buffer, 0, length);
 644			}
 645			os.flush();
 646			os.close();
 647			avatar.sha1sum = CryptoHelper.bytesToHex(digest.digest());
 648			avatar.image = new String(mByteArrayOutputStream.toByteArray());
 649			avatar.height = options.outHeight;
 650			avatar.width = options.outWidth;
 651			avatar.type = options.outMimeType;
 652			return avatar;
 653		} catch (NoSuchAlgorithmException | IOException e) {
 654			return null;
 655		} finally {
 656			close(is);
 657		}
 658	}
 659
 660	public boolean isAvatarCached(Avatar avatar) {
 661		File file = new File(getAvatarPath(avatar.getFilename()));
 662		return file.exists();
 663	}
 664
 665	public boolean save(final Avatar avatar) {
 666		File file;
 667		if (isAvatarCached(avatar)) {
 668			file = new File(getAvatarPath(avatar.getFilename()));
 669			avatar.size = file.length();
 670		} else {
 671			file = new File(mXmppConnectionService.getCacheDir().getAbsolutePath()+"/"+ UUID.randomUUID().toString());
 672			file.getParentFile().mkdirs();
 673			OutputStream os = null;
 674			try {
 675				file.createNewFile();
 676				os = new FileOutputStream(file);
 677				MessageDigest digest = MessageDigest.getInstance("SHA-1");
 678				digest.reset();
 679				DigestOutputStream mDigestOutputStream = new DigestOutputStream(os, digest);
 680				final byte[] bytes = avatar.getImageAsBytes();
 681				mDigestOutputStream.write(bytes);
 682				mDigestOutputStream.flush();
 683				mDigestOutputStream.close();
 684				String sha1sum = CryptoHelper.bytesToHex(digest.digest());
 685				if (sha1sum.equals(avatar.sha1sum)) {
 686					String filename = getAvatarPath(avatar.getFilename());
 687					file.renameTo(new File(filename));
 688				} else {
 689					Log.d(Config.LOGTAG, "sha1sum mismatch for " + avatar.owner);
 690					file.delete();
 691					return false;
 692				}
 693				avatar.size = bytes.length;
 694			} catch (IllegalArgumentException | IOException | NoSuchAlgorithmException e) {
 695				return false;
 696			} finally {
 697				close(os);
 698			}
 699		}
 700		return true;
 701	}
 702
 703	private String getAvatarPath(String avatar) {
 704		return mXmppConnectionService.getFilesDir().getAbsolutePath() + "/avatars/" + avatar;
 705	}
 706
 707	public Uri getAvatarUri(String avatar) {
 708		return Uri.parse("file:" + getAvatarPath(avatar));
 709	}
 710
 711	public Bitmap cropCenterSquare(Uri image, int size) {
 712		if (image == null) {
 713			return null;
 714		}
 715		InputStream is = null;
 716		try {
 717			BitmapFactory.Options options = new BitmapFactory.Options();
 718			options.inSampleSize = calcSampleSize(image, size);
 719			is = mXmppConnectionService.getContentResolver().openInputStream(image);
 720			if (is == null) {
 721				return null;
 722			}
 723			Bitmap input = BitmapFactory.decodeStream(is, null, options);
 724			if (input == null) {
 725				return null;
 726			} else {
 727				input = rotate(input, getRotation(image));
 728				return cropCenterSquare(input, size);
 729			}
 730		} catch (SecurityException e) {
 731			return null; // happens for example on Android 6.0 if contacts permissions get revoked
 732		} catch (FileNotFoundException e) {
 733			return null;
 734		} finally {
 735			close(is);
 736		}
 737	}
 738
 739	public Bitmap cropCenter(Uri image, int newHeight, int newWidth) {
 740		if (image == null) {
 741			return null;
 742		}
 743		InputStream is = null;
 744		try {
 745			BitmapFactory.Options options = new BitmapFactory.Options();
 746			options.inSampleSize = calcSampleSize(image, Math.max(newHeight, newWidth));
 747			is = mXmppConnectionService.getContentResolver().openInputStream(image);
 748			if (is == null) {
 749				return null;
 750			}
 751			Bitmap source = BitmapFactory.decodeStream(is, null, options);
 752			if (source == null) {
 753				return null;
 754			}
 755			int sourceWidth = source.getWidth();
 756			int sourceHeight = source.getHeight();
 757			float xScale = (float) newWidth / sourceWidth;
 758			float yScale = (float) newHeight / sourceHeight;
 759			float scale = Math.max(xScale, yScale);
 760			float scaledWidth = scale * sourceWidth;
 761			float scaledHeight = scale * sourceHeight;
 762			float left = (newWidth - scaledWidth) / 2;
 763			float top = (newHeight - scaledHeight) / 2;
 764
 765			RectF targetRect = new RectF(left, top, left + scaledWidth, top + scaledHeight);
 766			Bitmap dest = Bitmap.createBitmap(newWidth, newHeight, Bitmap.Config.ARGB_8888);
 767			Canvas canvas = new Canvas(dest);
 768			canvas.drawBitmap(source, null, targetRect, createAntiAliasingPaint());
 769			if (source.isRecycled()) {
 770				source.recycle();
 771			}
 772			return dest;
 773		} catch (SecurityException e) {
 774			return null; //android 6.0 with revoked permissions for example
 775		} catch (FileNotFoundException e) {
 776			return null;
 777		} finally {
 778			close(is);
 779		}
 780	}
 781
 782	public Bitmap cropCenterSquare(Bitmap input, int size) {
 783		int w = input.getWidth();
 784		int h = input.getHeight();
 785
 786		float scale = Math.max((float) size / h, (float) size / w);
 787
 788		float outWidth = scale * w;
 789		float outHeight = scale * h;
 790		float left = (size - outWidth) / 2;
 791		float top = (size - outHeight) / 2;
 792		RectF target = new RectF(left, top, left + outWidth, top + outHeight);
 793
 794		Bitmap output = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
 795		Canvas canvas = new Canvas(output);
 796		canvas.drawBitmap(input, null, target, createAntiAliasingPaint());
 797		if (!input.isRecycled()) {
 798			input.recycle();
 799		}
 800		return output;
 801	}
 802
 803	private int calcSampleSize(Uri image, int size) throws FileNotFoundException, SecurityException {
 804		BitmapFactory.Options options = new BitmapFactory.Options();
 805		options.inJustDecodeBounds = true;
 806		BitmapFactory.decodeStream(mXmppConnectionService.getContentResolver().openInputStream(image), null, options);
 807		return calcSampleSize(options, size);
 808	}
 809
 810	private static int calcSampleSize(File image, int size) {
 811		BitmapFactory.Options options = new BitmapFactory.Options();
 812		options.inJustDecodeBounds = true;
 813		BitmapFactory.decodeFile(image.getAbsolutePath(), options);
 814		return calcSampleSize(options, size);
 815	}
 816
 817	public static int calcSampleSize(BitmapFactory.Options options, int size) {
 818		int height = options.outHeight;
 819		int width = options.outWidth;
 820		int inSampleSize = 1;
 821
 822		if (height > size || width > size) {
 823			int halfHeight = height / 2;
 824			int halfWidth = width / 2;
 825
 826			while ((halfHeight / inSampleSize) > size
 827					&& (halfWidth / inSampleSize) > size) {
 828				inSampleSize *= 2;
 829			}
 830		}
 831		return inSampleSize;
 832	}
 833
 834	public void updateFileParams(Message message) {
 835		updateFileParams(message, null);
 836	}
 837
 838	public void updateFileParams(Message message, URL url) {
 839		DownloadableFile file = getFile(message);
 840		final String mime = file.getMimeType();
 841		boolean image = message.getType() == Message.TYPE_IMAGE || (mime != null && mime.startsWith("image/"));
 842		boolean video = mime != null && mime.startsWith("video/");
 843		boolean audio = mime != null && mime.startsWith("audio/");
 844		final StringBuilder body = new StringBuilder();
 845		if (url != null) {
 846			body.append(url.toString());
 847		}
 848		body.append('|').append(file.getSize());
 849		if (image || video) {
 850			try {
 851				Dimensions dimensions = image ? getImageDimensions(file) : getVideoDimensions(file);
 852				body.append('|').append(dimensions.width).append('|').append(dimensions.height);
 853			} catch (NotAVideoFile notAVideoFile) {
 854				Log.d(Config.LOGTAG, "file with mime type " + file.getMimeType() + " was not a video file");
 855				//fall threw
 856			}
 857		} else if (audio) {
 858			body.append("|0|0|").append(getMediaRuntime(file));
 859		}
 860		message.setBody(body.toString());
 861	}
 862
 863	public int getMediaRuntime(Uri uri) {
 864		try {
 865			MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever();
 866			mediaMetadataRetriever.setDataSource(mXmppConnectionService, uri);
 867			return Integer.parseInt(mediaMetadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION));
 868		} catch (RuntimeException e) {
 869			return 0;
 870		}
 871	}
 872
 873	private int getMediaRuntime(File file) {
 874		try {
 875			MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever();
 876			mediaMetadataRetriever.setDataSource(file.toString());
 877			return Integer.parseInt(mediaMetadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION));
 878		} catch (RuntimeException e) {
 879			return 0;
 880		}
 881	}
 882
 883	private Dimensions getImageDimensions(File file) {
 884		BitmapFactory.Options options = new BitmapFactory.Options();
 885		options.inJustDecodeBounds = true;
 886		BitmapFactory.decodeFile(file.getAbsolutePath(), options);
 887		int rotation = getRotation(file);
 888		boolean rotated = rotation == 90 || rotation == 270;
 889		int imageHeight = rotated ? options.outWidth : options.outHeight;
 890		int imageWidth = rotated ? options.outHeight : options.outWidth;
 891		return new Dimensions(imageHeight, imageWidth);
 892	}
 893
 894	private Dimensions getVideoDimensions(File file) throws NotAVideoFile {
 895		MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever();
 896		try {
 897			metadataRetriever.setDataSource(file.getAbsolutePath());
 898		} catch (RuntimeException e) {
 899			throw new NotAVideoFile(e);
 900		}
 901		return getVideoDimensions(metadataRetriever);
 902	}
 903
 904	private static Dimensions getVideoDimensions(Context context, Uri uri) throws NotAVideoFile {
 905		MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever();
 906		try {
 907			mediaMetadataRetriever.setDataSource(context, uri);
 908		} catch (RuntimeException e) {
 909			throw new NotAVideoFile(e);
 910		}
 911		return getVideoDimensions(mediaMetadataRetriever);
 912	}
 913
 914	private static Dimensions getVideoDimensions(MediaMetadataRetriever metadataRetriever) throws NotAVideoFile {
 915		String hasVideo = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_HAS_VIDEO);
 916		if (hasVideo == null) {
 917			throw new NotAVideoFile();
 918		}
 919		int rotation = extractRotationFromMediaRetriever(metadataRetriever);
 920		boolean rotated = rotation == 90 || rotation == 270;
 921		int height;
 922		try {
 923			String h = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT);
 924			height = Integer.parseInt(h);
 925		} catch (Exception e) {
 926			height = -1;
 927		}
 928		int width;
 929		try {
 930			String w = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH);
 931			width = Integer.parseInt(w);
 932		} catch (Exception e) {
 933			width = -1;
 934		}
 935		metadataRetriever.release();
 936		Log.d(Config.LOGTAG, "extracted video dims " + width + "x" + height);
 937		return rotated ? new Dimensions(width, height) : new Dimensions(height, width);
 938	}
 939
 940	private static int extractRotationFromMediaRetriever(MediaMetadataRetriever metadataRetriever) {
 941		int rotation;
 942		if (Build.VERSION.SDK_INT >= 17) {
 943			String r = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_ROTATION);
 944			try {
 945				rotation = Integer.parseInt(r);
 946			} catch (Exception e) {
 947				rotation = 0;
 948			}
 949		} else {
 950			rotation = 0;
 951		}
 952		return rotation;
 953	}
 954
 955	private static class Dimensions {
 956		public final int width;
 957		public final int height;
 958
 959		public Dimensions(int height, int width) {
 960			this.width = width;
 961			this.height = height;
 962		}
 963
 964		public int getMin() {
 965			return Math.min(width, height);
 966		}
 967	}
 968
 969	private static class NotAVideoFile extends Exception {
 970		public NotAVideoFile(Throwable t) {
 971			super(t);
 972		}
 973
 974		public NotAVideoFile() {
 975			super();
 976		}
 977	}
 978
 979	public class FileCopyException extends Exception {
 980		private static final long serialVersionUID = -1010013599132881427L;
 981		private int resId;
 982
 983		public FileCopyException(int resId) {
 984			this.resId = resId;
 985		}
 986
 987		public int getResId() {
 988			return resId;
 989		}
 990	}
 991
 992	public Bitmap getAvatar(String avatar, int size) {
 993		if (avatar == null) {
 994			return null;
 995		}
 996		Bitmap bm = cropCenter(getAvatarUri(avatar), size, size);
 997		if (bm == null) {
 998			return null;
 999		}
1000		return bm;
1001	}
1002
1003	public boolean isFileAvailable(Message message) {
1004		return getFile(message).exists();
1005	}
1006
1007	public static void close(Closeable stream) {
1008		if (stream != null) {
1009			try {
1010				stream.close();
1011			} catch (IOException e) {
1012			}
1013		}
1014	}
1015
1016	public static void close(Socket socket) {
1017		if (socket != null) {
1018			try {
1019				socket.close();
1020			} catch (IOException e) {
1021			}
1022		}
1023	}
1024
1025
1026	public static boolean weOwnFile(Context context, Uri uri) {
1027		if (uri == null || !ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
1028			return false;
1029		} else if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
1030			return fileIsInFilesDir(context, uri);
1031		} else {
1032			return weOwnFileLollipop(uri);
1033		}
1034	}
1035
1036
1037	/**
1038	 * This is more than hacky but probably way better than doing nothing
1039	 * Further 'optimizations' might contain to get the parents of CacheDir and NoBackupDir
1040	 * and check against those as well
1041	 */
1042	private static boolean fileIsInFilesDir(Context context, Uri uri) {
1043		try {
1044			final String haystack = context.getFilesDir().getParentFile().getCanonicalPath();
1045			final String needle = new File(uri.getPath()).getCanonicalPath();
1046			return needle.startsWith(haystack);
1047		} catch (IOException e) {
1048			return false;
1049		}
1050	}
1051
1052	@TargetApi(Build.VERSION_CODES.LOLLIPOP)
1053	private static boolean weOwnFileLollipop(Uri uri) {
1054		try {
1055			File file = new File(uri.getPath());
1056			FileDescriptor fd = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY).getFileDescriptor();
1057			StructStat st = Os.fstat(fd);
1058			return st.st_uid == android.os.Process.myUid();
1059		} catch (FileNotFoundException e) {
1060			return false;
1061		} catch (Exception e) {
1062			return true;
1063		}
1064	}
1065}