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.ui.RecordingActivity;
  59import eu.siacs.conversations.utils.CryptoHelper;
  60import eu.siacs.conversations.utils.ExifHelper;
  61import eu.siacs.conversations.utils.FileUtils;
  62import eu.siacs.conversations.utils.FileWriterException;
  63import eu.siacs.conversations.utils.MimeUtils;
  64import eu.siacs.conversations.xmpp.pep.Avatar;
  65
  66public class FileBackend {
  67
  68	private static final Object THUMBNAIL_LOCK = new Object();
  69
  70	private static final SimpleDateFormat IMAGE_DATE_FORMAT = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US);
  71
  72	private static final String FILE_PROVIDER = ".files";
  73
  74	private XmppConnectionService mXmppConnectionService;
  75
  76	public FileBackend(XmppConnectionService service) {
  77		this.mXmppConnectionService = service;
  78	}
  79
  80	private void createNoMedia(File diretory) {
  81		final File noMedia = new File(diretory,".nomedia");
  82		if (!noMedia.exists()) {
  83			try {
  84				if (!noMedia.createNewFile()) {
  85					Log.d(Config.LOGTAG,"created nomedia file "+noMedia.getAbsolutePath());
  86				}
  87			} catch (Exception e) {
  88				Log.d(Config.LOGTAG, "could not create nomedia file");
  89			}
  90		}
  91	}
  92
  93	public void updateMediaScanner(File file) {
  94		if (!isInDirectoryThatShouldNotBeScanned(mXmppConnectionService, file)) {
  95			Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
  96			intent.setData(Uri.fromFile(file));
  97			mXmppConnectionService.sendBroadcast(intent);
  98		} else if (file.getAbsolutePath().startsWith(getAppMediaDirectory(mXmppConnectionService))) {
  99			createNoMedia(file.getParentFile());
 100		}
 101	}
 102
 103	private static boolean isInDirectoryThatShouldNotBeScanned(Context context, File file) {
 104		String path = file.getAbsolutePath();
 105		for(String type : new String[]{RecordingActivity.STORAGE_DIRECTORY_TYPE_NAME, "Files"}) {
 106			if (path.startsWith(getConversationsDirectory(context, type))) {
 107				return true;
 108			}
 109		}
 110		return false;
 111	}
 112
 113	public boolean deleteFile(Message message) {
 114		File file = getFile(message);
 115		if (file.delete()) {
 116			updateMediaScanner(file);
 117			return true;
 118		} else {
 119			return false;
 120		}
 121	}
 122
 123	public DownloadableFile getFile(Message message) {
 124		return getFile(message, true);
 125	}
 126
 127	public DownloadableFile getFileForPath(String path, String mime) {
 128		final DownloadableFile file;
 129		if (path.startsWith("/")) {
 130			file = new DownloadableFile(path);
 131		} else {
 132			if (mime != null && mime.startsWith("image/")) {
 133				file = new DownloadableFile(getConversationsDirectory("Images") + path);
 134			} else if (mime != null && mime.startsWith("video/")) {
 135				file = new DownloadableFile(getConversationsDirectory("Videos") + path);
 136			} else {
 137				file = new DownloadableFile(getConversationsDirectory("Files") + path);
 138			}
 139		}
 140		return file;
 141	}
 142
 143	public DownloadableFile getFile(Message message, boolean decrypted) {
 144		final boolean encrypted = !decrypted
 145				&& (message.getEncryption() == Message.ENCRYPTION_PGP
 146				|| message.getEncryption() == Message.ENCRYPTION_DECRYPTED);
 147		String path = message.getRelativeFilePath();
 148		if (path == null) {
 149			path = message.getUuid();
 150		}
 151		final DownloadableFile file = getFileForPath(path, message.getMimeType());
 152		if (encrypted) {
 153			return new DownloadableFile(getConversationsDirectory("Files") + file.getName() + ".pgp");
 154		} else {
 155			return file;
 156		}
 157	}
 158
 159	public static long getFileSize(Context context, Uri uri) {
 160		try {
 161			final Cursor cursor = context.getContentResolver().query(uri, null, null, null, null);
 162			if (cursor != null && cursor.moveToFirst()) {
 163				long size = cursor.getLong(cursor.getColumnIndex(OpenableColumns.SIZE));
 164				cursor.close();
 165				return size;
 166			} else {
 167				return -1;
 168			}
 169		} catch (Exception e) {
 170			return -1;
 171		}
 172	}
 173
 174	public static boolean allFilesUnderSize(Context context, List<Uri> uris, long max) {
 175		if (max <= 0) {
 176			Log.d(Config.LOGTAG, "server did not report max file size for http upload");
 177			return true; //exception to be compatible with HTTP Upload < v0.2
 178		}
 179		for (Uri uri : uris) {
 180			String mime = context.getContentResolver().getType(uri);
 181			if (mime != null && mime.startsWith("video/")) {
 182				try {
 183					Dimensions dimensions = FileBackend.getVideoDimensions(context, uri);
 184					if (dimensions.getMin() > 720) {
 185						Log.d(Config.LOGTAG, "do not consider video file with min width larger than 720 for size check");
 186						continue;
 187					}
 188				} catch (NotAVideoFile notAVideoFile) {
 189					//ignore and fall through
 190				}
 191			}
 192			if (FileBackend.getFileSize(context, uri) > max) {
 193				Log.d(Config.LOGTAG, "not all files are under " + max + " bytes. suggesting falling back to jingle");
 194				return false;
 195			}
 196		}
 197		return true;
 198	}
 199
 200	public String getConversationsDirectory(final String type) {
 201		return getConversationsDirectory(mXmppConnectionService, type);
 202	}
 203
 204	public static String getConversationsDirectory(Context context, final String type) {
 205		if (Config.ONLY_INTERNAL_STORAGE) {
 206			return context.getFilesDir().getAbsolutePath() + "/" + type + "/";
 207		} else {
 208			return getAppMediaDirectory(context)+context.getString(R.string.app_name)+" " + type + "/";
 209		}
 210	}
 211
 212	public static String getAppMediaDirectory(Context context) {
 213		return Environment.getExternalStorageDirectory().getAbsolutePath()+"/"+context.getString(R.string.app_name)+"/Media/";
 214	}
 215
 216	public static String getConversationsLogsDirectory() {
 217		return Environment.getExternalStorageDirectory().getAbsolutePath() + "/Conversations/";
 218	}
 219
 220	public Bitmap resize(Bitmap originalBitmap, int size) {
 221		int w = originalBitmap.getWidth();
 222		int h = originalBitmap.getHeight();
 223		if (Math.max(w, h) > size) {
 224			int scalledW;
 225			int scalledH;
 226			if (w <= h) {
 227				scalledW = (int) (w / ((double) h / size));
 228				scalledH = size;
 229			} else {
 230				scalledW = size;
 231				scalledH = (int) (h / ((double) w / size));
 232			}
 233			Bitmap result = Bitmap.createScaledBitmap(originalBitmap, scalledW, scalledH, true);
 234			if (originalBitmap != null && !originalBitmap.isRecycled()) {
 235				originalBitmap.recycle();
 236			}
 237			return result;
 238		} else {
 239			return originalBitmap;
 240		}
 241	}
 242
 243	private static Bitmap rotate(Bitmap bitmap, int degree) {
 244		if (degree == 0) {
 245			return bitmap;
 246		}
 247		int w = bitmap.getWidth();
 248		int h = bitmap.getHeight();
 249		Matrix mtx = new Matrix();
 250		mtx.postRotate(degree);
 251		Bitmap result = Bitmap.createBitmap(bitmap, 0, 0, w, h, mtx, true);
 252		if (bitmap != null && !bitmap.isRecycled()) {
 253			bitmap.recycle();
 254		}
 255		return result;
 256	}
 257
 258
 259	public boolean useImageAsIs(Uri uri) {
 260		String path = getOriginalPath(uri);
 261		if (path == null || isPathBlacklisted(path)) {
 262			return false;
 263		}
 264		File file = new File(path);
 265		long size = file.length();
 266		if (size == 0 || size >= mXmppConnectionService.getResources().getInteger(R.integer.auto_accept_filesize)) {
 267			return false;
 268		}
 269		BitmapFactory.Options options = new BitmapFactory.Options();
 270		options.inJustDecodeBounds = true;
 271		try {
 272			BitmapFactory.decodeStream(mXmppConnectionService.getContentResolver().openInputStream(uri), null, options);
 273			if (options.outMimeType == null || options.outHeight <= 0 || options.outWidth <= 0) {
 274				return false;
 275			}
 276			return (options.outWidth <= Config.IMAGE_SIZE && options.outHeight <= Config.IMAGE_SIZE && options.outMimeType.contains(Config.IMAGE_FORMAT.name().toLowerCase()));
 277		} catch (FileNotFoundException e) {
 278			return false;
 279		}
 280	}
 281
 282	public static boolean isPathBlacklisted(String path) {
 283		Environment.getDataDirectory();
 284		final String androidDataPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Android/data/";
 285		return path.startsWith(androidDataPath);
 286	}
 287
 288	public String getOriginalPath(Uri uri) {
 289		return FileUtils.getPath(mXmppConnectionService, uri);
 290	}
 291
 292	private void copyFileToPrivateStorage(File file, Uri uri) throws FileCopyException {
 293		Log.d(Config.LOGTAG, "copy file (" + uri.toString() + ") to private storage " + file.getAbsolutePath());
 294		file.getParentFile().mkdirs();
 295		OutputStream os = null;
 296		InputStream is = null;
 297		try {
 298			file.createNewFile();
 299			os = new FileOutputStream(file);
 300			is = mXmppConnectionService.getContentResolver().openInputStream(uri);
 301			byte[] buffer = new byte[1024];
 302			int length;
 303			while ((length = is.read(buffer)) > 0) {
 304				try {
 305					os.write(buffer, 0, length);
 306				} catch (IOException e) {
 307					throw new FileWriterException();
 308				}
 309			}
 310			try {
 311				os.flush();
 312			} catch (IOException e) {
 313				throw new FileWriterException();
 314			}
 315		} catch (FileNotFoundException e) {
 316			throw new FileCopyException(R.string.error_file_not_found);
 317		} catch (FileWriterException e) {
 318			throw new FileCopyException(R.string.error_unable_to_create_temporary_file);
 319		} catch (IOException e) {
 320			e.printStackTrace();
 321			throw new FileCopyException(R.string.error_io_exception);
 322		} finally {
 323			close(os);
 324			close(is);
 325		}
 326	}
 327
 328	public void copyFileToPrivateStorage(Message message, Uri uri, String type) throws FileCopyException {
 329		String mime = type != null ? type : MimeUtils.guessMimeTypeFromUri(mXmppConnectionService, uri);
 330		Log.d(Config.LOGTAG, "copy " + uri.toString() + " to private storage (mime=" + mime + ")");
 331		String extension = MimeUtils.guessExtensionFromMimeType(mime);
 332		if (extension == null) {
 333			extension = getExtensionFromUri(uri);
 334		}
 335		message.setRelativeFilePath(message.getUuid() + "." + extension);
 336		copyFileToPrivateStorage(mXmppConnectionService.getFileBackend().getFile(message), uri);
 337	}
 338
 339	private String getExtensionFromUri(Uri uri) {
 340		String[] projection = {MediaStore.MediaColumns.DATA};
 341		String filename = null;
 342		Cursor cursor = mXmppConnectionService.getContentResolver().query(uri, projection, null, null, null);
 343		if (cursor != null) {
 344			try {
 345				if (cursor.moveToFirst()) {
 346					filename = cursor.getString(0);
 347				}
 348			} catch (Exception e) {
 349				filename = null;
 350			} finally {
 351				cursor.close();
 352			}
 353		}
 354		int pos = filename == null ? -1 : filename.lastIndexOf('.');
 355		return pos > 0 ? filename.substring(pos + 1) : null;
 356	}
 357
 358	private void copyImageToPrivateStorage(File file, Uri image, int sampleSize) throws FileCopyException {
 359		file.getParentFile().mkdirs();
 360		InputStream is = null;
 361		OutputStream os = null;
 362		try {
 363			if (!file.exists() && !file.createNewFile()) {
 364				throw new FileCopyException(R.string.error_unable_to_create_temporary_file);
 365			}
 366			is = mXmppConnectionService.getContentResolver().openInputStream(image);
 367			if (is == null) {
 368				throw new FileCopyException(R.string.error_not_an_image_file);
 369			}
 370			Bitmap originalBitmap;
 371			BitmapFactory.Options options = new BitmapFactory.Options();
 372			int inSampleSize = (int) Math.pow(2, sampleSize);
 373			Log.d(Config.LOGTAG, "reading bitmap with sample size " + inSampleSize);
 374			options.inSampleSize = inSampleSize;
 375			originalBitmap = BitmapFactory.decodeStream(is, null, options);
 376			is.close();
 377			if (originalBitmap == null) {
 378				throw new FileCopyException(R.string.error_not_an_image_file);
 379			}
 380			Bitmap scaledBitmap = resize(originalBitmap, Config.IMAGE_SIZE);
 381			int rotation = getRotation(image);
 382			scaledBitmap = rotate(scaledBitmap, rotation);
 383			boolean targetSizeReached = false;
 384			int quality = Config.IMAGE_QUALITY;
 385			final int imageMaxSize = mXmppConnectionService.getResources().getInteger(R.integer.auto_accept_filesize);
 386			while (!targetSizeReached) {
 387				os = new FileOutputStream(file);
 388				boolean success = scaledBitmap.compress(Config.IMAGE_FORMAT, quality, os);
 389				if (!success) {
 390					throw new FileCopyException(R.string.error_compressing_image);
 391				}
 392				os.flush();
 393				targetSizeReached = file.length() <= imageMaxSize || quality <= 50;
 394				quality -= 5;
 395			}
 396			scaledBitmap.recycle();
 397		} catch (FileNotFoundException e) {
 398			throw new FileCopyException(R.string.error_file_not_found);
 399		} catch (IOException e) {
 400			e.printStackTrace();
 401			throw new FileCopyException(R.string.error_io_exception);
 402		} catch (SecurityException e) {
 403			throw new FileCopyException(R.string.error_security_exception_during_image_copy);
 404		} catch (OutOfMemoryError e) {
 405			++sampleSize;
 406			if (sampleSize <= 3) {
 407				copyImageToPrivateStorage(file, image, sampleSize);
 408			} else {
 409				throw new FileCopyException(R.string.error_out_of_memory);
 410			}
 411		} finally {
 412			close(os);
 413			close(is);
 414		}
 415	}
 416
 417	public void copyImageToPrivateStorage(File file, Uri image) throws FileCopyException {
 418		Log.d(Config.LOGTAG, "copy image (" + image.toString() + ") to private storage " + file.getAbsolutePath());
 419		copyImageToPrivateStorage(file, image, 0);
 420	}
 421
 422	public void copyImageToPrivateStorage(Message message, Uri image) throws FileCopyException {
 423		switch (Config.IMAGE_FORMAT) {
 424			case JPEG:
 425				message.setRelativeFilePath(message.getUuid() + ".jpg");
 426				break;
 427			case PNG:
 428				message.setRelativeFilePath(message.getUuid() + ".png");
 429				break;
 430			case WEBP:
 431				message.setRelativeFilePath(message.getUuid() + ".webp");
 432				break;
 433		}
 434		copyImageToPrivateStorage(getFile(message), image);
 435		updateFileParams(message);
 436	}
 437
 438	private int getRotation(File file) {
 439		return getRotation(Uri.parse("file://" + file.getAbsolutePath()));
 440	}
 441
 442	private int getRotation(Uri image) {
 443		InputStream is = null;
 444		try {
 445			is = mXmppConnectionService.getContentResolver().openInputStream(image);
 446			return ExifHelper.getOrientation(is);
 447		} catch (FileNotFoundException e) {
 448			return 0;
 449		} finally {
 450			close(is);
 451		}
 452	}
 453
 454	public Bitmap getThumbnail(Message message, int size, boolean cacheOnly) throws FileNotFoundException {
 455		final String uuid = message.getUuid();
 456		final LruCache<String, Bitmap> cache = mXmppConnectionService.getBitmapCache();
 457		Bitmap thumbnail = cache.get(uuid);
 458		if ((thumbnail == null) && (!cacheOnly)) {
 459			synchronized (THUMBNAIL_LOCK) {
 460				thumbnail = cache.get(uuid);
 461				if (thumbnail != null) {
 462					return thumbnail;
 463				}
 464				DownloadableFile file = getFile(message);
 465				final String mime = file.getMimeType();
 466				if (mime.startsWith("video/")) {
 467					thumbnail = getVideoPreview(file, size);
 468				} else {
 469					Bitmap fullsize = getFullsizeImagePreview(file, size);
 470					if (fullsize == null) {
 471						throw new FileNotFoundException();
 472					}
 473					thumbnail = resize(fullsize, size);
 474					thumbnail = rotate(thumbnail, getRotation(file));
 475					if (mime.equals("image/gif")) {
 476						Bitmap withGifOverlay = thumbnail.copy(Bitmap.Config.ARGB_8888, true);
 477						drawOverlay(withGifOverlay, R.drawable.play_gif, 1.0f);
 478						thumbnail.recycle();
 479						thumbnail = withGifOverlay;
 480					}
 481				}
 482				this.mXmppConnectionService.getBitmapCache().put(uuid, thumbnail);
 483			}
 484		}
 485		return thumbnail;
 486	}
 487
 488	private Bitmap getFullsizeImagePreview(File file, int size) {
 489		BitmapFactory.Options options = new BitmapFactory.Options();
 490		options.inSampleSize = calcSampleSize(file, size);
 491		try {
 492			return BitmapFactory.decodeFile(file.getAbsolutePath(), options);
 493		} catch (OutOfMemoryError e) {
 494			options.inSampleSize *= 2;
 495			return BitmapFactory.decodeFile(file.getAbsolutePath(), options);
 496		}
 497	}
 498
 499	private void drawOverlay(Bitmap bitmap, int resource, float factor) {
 500		Bitmap overlay = BitmapFactory.decodeResource(mXmppConnectionService.getResources(), resource);
 501		Canvas canvas = new Canvas(bitmap);
 502		float targetSize = Math.min(canvas.getWidth(), canvas.getHeight()) * factor;
 503		Log.d(Config.LOGTAG, "target size overlay: " + targetSize + " overlay bitmap size was " + overlay.getHeight());
 504		float left = (canvas.getWidth() - targetSize) / 2.0f;
 505		float top = (canvas.getHeight() - targetSize) / 2.0f;
 506		RectF dst = new RectF(left, top, left + targetSize - 1, top + targetSize - 1);
 507		canvas.drawBitmap(overlay, null, dst, createAntiAliasingPaint());
 508	}
 509
 510	private static Paint createAntiAliasingPaint() {
 511		Paint paint = new Paint();
 512		paint.setAntiAlias(true);
 513		paint.setFilterBitmap(true);
 514		paint.setDither(true);
 515		return paint;
 516	}
 517
 518	private Bitmap getVideoPreview(File file, int size) {
 519		MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever();
 520		Bitmap frame;
 521		try {
 522			metadataRetriever.setDataSource(file.getAbsolutePath());
 523			frame = metadataRetriever.getFrameAtTime(0);
 524			metadataRetriever.release();
 525			frame = resize(frame, size);
 526		} catch (RuntimeException e) {
 527			frame = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
 528			frame.eraseColor(0xff000000);
 529		}
 530		drawOverlay(frame, R.drawable.play_video, 0.75f);
 531		return frame;
 532	}
 533
 534	private static String getTakePhotoPath() {
 535		return Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM) + "/Camera/";
 536	}
 537
 538	public Uri getTakePhotoUri() {
 539		File file;
 540		if (Config.ONLY_INTERNAL_STORAGE) {
 541			file = new File(mXmppConnectionService.getCacheDir().getAbsolutePath(), "Camera/IMG_" + this.IMAGE_DATE_FORMAT.format(new Date()) + ".jpg");
 542		} else {
 543			file = new File(getTakePhotoPath() + "IMG_" + this.IMAGE_DATE_FORMAT.format(new Date()) + ".jpg");
 544		}
 545		file.getParentFile().mkdirs();
 546		return getUriForFile(mXmppConnectionService, file);
 547	}
 548
 549	public static Uri getUriForFile(Context context, File file) {
 550		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N || Config.ONLY_INTERNAL_STORAGE) {
 551			try {
 552				return FileProvider.getUriForFile(context, getAuthority(context), file);
 553			} catch (IllegalArgumentException e) {
 554				if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
 555					throw new SecurityException(e);
 556				} else {
 557					return Uri.fromFile(file);
 558				}
 559			}
 560		} else {
 561			return Uri.fromFile(file);
 562		}
 563	}
 564
 565	public static String getAuthority(Context context) {
 566		return context.getPackageName() + FILE_PROVIDER;
 567	}
 568
 569	public static Uri getIndexableTakePhotoUri(Uri original) {
 570		if (Config.ONLY_INTERNAL_STORAGE || "file".equals(original.getScheme())) {
 571			return original;
 572		} else {
 573			List<String> segments = original.getPathSegments();
 574			return Uri.parse("file://" + getTakePhotoPath() + segments.get(segments.size() - 1));
 575		}
 576	}
 577
 578	public Avatar getPepAvatar(Uri image, int size, Bitmap.CompressFormat format) {
 579		Bitmap bm = cropCenterSquare(image, size);
 580		if (bm == null) {
 581			return null;
 582		}
 583		if (hasAlpha(bm)) {
 584			Log.d(Config.LOGTAG, "alpha in avatar detected; uploading as PNG");
 585			bm.recycle();
 586			bm = cropCenterSquare(image, 96);
 587			return getPepAvatar(bm, Bitmap.CompressFormat.PNG, 100);
 588		}
 589		return getPepAvatar(bm, format, 100);
 590	}
 591
 592	private static boolean hasAlpha(final Bitmap bitmap) {
 593		for (int x = 0; x < bitmap.getWidth(); ++x) {
 594			for (int y = 0; y < bitmap.getWidth(); ++y) {
 595				if (Color.alpha(bitmap.getPixel(x, y)) < 255) {
 596					return true;
 597				}
 598			}
 599		}
 600		return false;
 601	}
 602
 603	private Avatar getPepAvatar(Bitmap bitmap, Bitmap.CompressFormat format, int quality) {
 604		try {
 605			ByteArrayOutputStream mByteArrayOutputStream = new ByteArrayOutputStream();
 606			Base64OutputStream mBase64OutputStream = new Base64OutputStream(mByteArrayOutputStream, Base64.DEFAULT);
 607			MessageDigest digest = MessageDigest.getInstance("SHA-1");
 608			DigestOutputStream mDigestOutputStream = new DigestOutputStream(mBase64OutputStream, digest);
 609			if (!bitmap.compress(format, quality, mDigestOutputStream)) {
 610				return null;
 611			}
 612			mDigestOutputStream.flush();
 613			mDigestOutputStream.close();
 614			long chars = mByteArrayOutputStream.size();
 615			if (format != Bitmap.CompressFormat.PNG && quality >= 50 && chars >= Config.AVATAR_CHAR_LIMIT) {
 616				int q = quality - 2;
 617				Log.d(Config.LOGTAG, "avatar char length was " + chars + " reducing quality to " + q);
 618				return getPepAvatar(bitmap, format, q);
 619			}
 620			Log.d(Config.LOGTAG, "settled on char length " + chars + " with quality=" + quality);
 621			final Avatar avatar = new Avatar();
 622			avatar.sha1sum = CryptoHelper.bytesToHex(digest.digest());
 623			avatar.image = new String(mByteArrayOutputStream.toByteArray());
 624			if (format.equals(Bitmap.CompressFormat.WEBP)) {
 625				avatar.type = "image/webp";
 626			} else if (format.equals(Bitmap.CompressFormat.JPEG)) {
 627				avatar.type = "image/jpeg";
 628			} else if (format.equals(Bitmap.CompressFormat.PNG)) {
 629				avatar.type = "image/png";
 630			}
 631			avatar.width = bitmap.getWidth();
 632			avatar.height = bitmap.getHeight();
 633			return avatar;
 634		} catch (Exception e) {
 635			return null;
 636		}
 637	}
 638
 639	public Avatar getStoredPepAvatar(String hash) {
 640		if (hash == null) {
 641			return null;
 642		}
 643		Avatar avatar = new Avatar();
 644		File file = new File(getAvatarPath(hash));
 645		FileInputStream is = null;
 646		try {
 647			avatar.size = file.length();
 648			BitmapFactory.Options options = new BitmapFactory.Options();
 649			options.inJustDecodeBounds = true;
 650			BitmapFactory.decodeFile(file.getAbsolutePath(), options);
 651			is = new FileInputStream(file);
 652			ByteArrayOutputStream mByteArrayOutputStream = new ByteArrayOutputStream();
 653			Base64OutputStream mBase64OutputStream = new Base64OutputStream(mByteArrayOutputStream, Base64.DEFAULT);
 654			MessageDigest digest = MessageDigest.getInstance("SHA-1");
 655			DigestOutputStream os = new DigestOutputStream(mBase64OutputStream, digest);
 656			byte[] buffer = new byte[4096];
 657			int length;
 658			while ((length = is.read(buffer)) > 0) {
 659				os.write(buffer, 0, length);
 660			}
 661			os.flush();
 662			os.close();
 663			avatar.sha1sum = CryptoHelper.bytesToHex(digest.digest());
 664			avatar.image = new String(mByteArrayOutputStream.toByteArray());
 665			avatar.height = options.outHeight;
 666			avatar.width = options.outWidth;
 667			avatar.type = options.outMimeType;
 668			return avatar;
 669		} catch (NoSuchAlgorithmException | IOException e) {
 670			return null;
 671		} finally {
 672			close(is);
 673		}
 674	}
 675
 676	public boolean isAvatarCached(Avatar avatar) {
 677		File file = new File(getAvatarPath(avatar.getFilename()));
 678		return file.exists();
 679	}
 680
 681	public boolean save(final Avatar avatar) {
 682		File file;
 683		if (isAvatarCached(avatar)) {
 684			file = new File(getAvatarPath(avatar.getFilename()));
 685			avatar.size = file.length();
 686		} else {
 687			file = new File(mXmppConnectionService.getCacheDir().getAbsolutePath() + "/" + UUID.randomUUID().toString());
 688			if (file.getParentFile().mkdirs()) {
 689				Log.d(Config.LOGTAG,"created cache directory");
 690			}
 691			OutputStream os = null;
 692			try {
 693				if (!file.createNewFile()) {
 694					Log.d(Config.LOGTAG,"unable to create temporary file "+file.getAbsolutePath());
 695				}
 696				os = new FileOutputStream(file);
 697				MessageDigest digest = MessageDigest.getInstance("SHA-1");
 698				digest.reset();
 699				DigestOutputStream mDigestOutputStream = new DigestOutputStream(os, digest);
 700				final byte[] bytes = avatar.getImageAsBytes();
 701				mDigestOutputStream.write(bytes);
 702				mDigestOutputStream.flush();
 703				mDigestOutputStream.close();
 704				String sha1sum = CryptoHelper.bytesToHex(digest.digest());
 705				if (sha1sum.equals(avatar.sha1sum)) {
 706					File outputFile = new File(getAvatarPath(avatar.getFilename()));
 707					if (outputFile.getParentFile().mkdirs()) {
 708						Log.d(Config.LOGTAG,"created avatar directory");
 709					}
 710					String filename = getAvatarPath(avatar.getFilename());
 711					if (!file.renameTo(new File(filename))) {
 712						Log.d(Config.LOGTAG,"unable to rename "+file.getAbsolutePath()+" to "+outputFile);
 713						return false;
 714					}
 715				} else {
 716					Log.d(Config.LOGTAG, "sha1sum mismatch for " + avatar.owner);
 717					if (!file.delete()) {
 718						Log.d(Config.LOGTAG,"unable to delete temporary file");
 719					}
 720					return false;
 721				}
 722				avatar.size = bytes.length;
 723			} catch (IllegalArgumentException | IOException | NoSuchAlgorithmException e) {
 724				return false;
 725			} finally {
 726				close(os);
 727			}
 728		}
 729		return true;
 730	}
 731
 732	private String getAvatarPath(String avatar) {
 733		return mXmppConnectionService.getFilesDir().getAbsolutePath() + "/avatars/" + avatar;
 734	}
 735
 736	public Uri getAvatarUri(String avatar) {
 737		return Uri.parse("file:" + getAvatarPath(avatar));
 738	}
 739
 740	public Bitmap cropCenterSquare(Uri image, int size) {
 741		if (image == null) {
 742			return null;
 743		}
 744		InputStream is = null;
 745		try {
 746			BitmapFactory.Options options = new BitmapFactory.Options();
 747			options.inSampleSize = calcSampleSize(image, size);
 748			is = mXmppConnectionService.getContentResolver().openInputStream(image);
 749			if (is == null) {
 750				return null;
 751			}
 752			Bitmap input = BitmapFactory.decodeStream(is, null, options);
 753			if (input == null) {
 754				return null;
 755			} else {
 756				input = rotate(input, getRotation(image));
 757				return cropCenterSquare(input, size);
 758			}
 759		} catch (FileNotFoundException | SecurityException e) {
 760			return null;
 761		} finally {
 762			close(is);
 763		}
 764	}
 765
 766	public Bitmap cropCenter(Uri image, int newHeight, int newWidth) {
 767		if (image == null) {
 768			return null;
 769		}
 770		InputStream is = null;
 771		try {
 772			BitmapFactory.Options options = new BitmapFactory.Options();
 773			options.inSampleSize = calcSampleSize(image, Math.max(newHeight, newWidth));
 774			is = mXmppConnectionService.getContentResolver().openInputStream(image);
 775			if (is == null) {
 776				return null;
 777			}
 778			Bitmap source = BitmapFactory.decodeStream(is, null, options);
 779			if (source == null) {
 780				return null;
 781			}
 782			int sourceWidth = source.getWidth();
 783			int sourceHeight = source.getHeight();
 784			float xScale = (float) newWidth / sourceWidth;
 785			float yScale = (float) newHeight / sourceHeight;
 786			float scale = Math.max(xScale, yScale);
 787			float scaledWidth = scale * sourceWidth;
 788			float scaledHeight = scale * sourceHeight;
 789			float left = (newWidth - scaledWidth) / 2;
 790			float top = (newHeight - scaledHeight) / 2;
 791
 792			RectF targetRect = new RectF(left, top, left + scaledWidth, top + scaledHeight);
 793			Bitmap dest = Bitmap.createBitmap(newWidth, newHeight, Bitmap.Config.ARGB_8888);
 794			Canvas canvas = new Canvas(dest);
 795			canvas.drawBitmap(source, null, targetRect, createAntiAliasingPaint());
 796			if (source.isRecycled()) {
 797				source.recycle();
 798			}
 799			return dest;
 800		} catch (SecurityException e) {
 801			return null; //android 6.0 with revoked permissions for example
 802		} catch (FileNotFoundException e) {
 803			return null;
 804		} finally {
 805			close(is);
 806		}
 807	}
 808
 809	public Bitmap cropCenterSquare(Bitmap input, int size) {
 810		int w = input.getWidth();
 811		int h = input.getHeight();
 812
 813		float scale = Math.max((float) size / h, (float) size / w);
 814
 815		float outWidth = scale * w;
 816		float outHeight = scale * h;
 817		float left = (size - outWidth) / 2;
 818		float top = (size - outHeight) / 2;
 819		RectF target = new RectF(left, top, left + outWidth, top + outHeight);
 820
 821		Bitmap output = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
 822		Canvas canvas = new Canvas(output);
 823		canvas.drawBitmap(input, null, target, createAntiAliasingPaint());
 824		if (!input.isRecycled()) {
 825			input.recycle();
 826		}
 827		return output;
 828	}
 829
 830	private int calcSampleSize(Uri image, int size) throws FileNotFoundException, SecurityException {
 831		BitmapFactory.Options options = new BitmapFactory.Options();
 832		options.inJustDecodeBounds = true;
 833		BitmapFactory.decodeStream(mXmppConnectionService.getContentResolver().openInputStream(image), null, options);
 834		return calcSampleSize(options, size);
 835	}
 836
 837	private static int calcSampleSize(File image, int size) {
 838		BitmapFactory.Options options = new BitmapFactory.Options();
 839		options.inJustDecodeBounds = true;
 840		BitmapFactory.decodeFile(image.getAbsolutePath(), options);
 841		return calcSampleSize(options, size);
 842	}
 843
 844	public static int calcSampleSize(BitmapFactory.Options options, int size) {
 845		int height = options.outHeight;
 846		int width = options.outWidth;
 847		int inSampleSize = 1;
 848
 849		if (height > size || width > size) {
 850			int halfHeight = height / 2;
 851			int halfWidth = width / 2;
 852
 853			while ((halfHeight / inSampleSize) > size
 854					&& (halfWidth / inSampleSize) > size) {
 855				inSampleSize *= 2;
 856			}
 857		}
 858		return inSampleSize;
 859	}
 860
 861	public void updateFileParams(Message message) {
 862		updateFileParams(message, null);
 863	}
 864
 865	public void updateFileParams(Message message, URL url) {
 866		DownloadableFile file = getFile(message);
 867		final String mime = file.getMimeType();
 868		boolean image = message.getType() == Message.TYPE_IMAGE || (mime != null && mime.startsWith("image/"));
 869		boolean video = mime != null && mime.startsWith("video/");
 870		boolean audio = mime != null && mime.startsWith("audio/");
 871		final StringBuilder body = new StringBuilder();
 872		if (url != null) {
 873			body.append(url.toString());
 874		}
 875		body.append('|').append(file.getSize());
 876		if (image || video) {
 877			try {
 878				Dimensions dimensions = image ? getImageDimensions(file) : getVideoDimensions(file);
 879				body.append('|').append(dimensions.width).append('|').append(dimensions.height);
 880			} catch (NotAVideoFile notAVideoFile) {
 881				Log.d(Config.LOGTAG, "file with mime type " + file.getMimeType() + " was not a video file");
 882				//fall threw
 883			}
 884		} else if (audio) {
 885			body.append("|0|0|").append(getMediaRuntime(file));
 886		}
 887		message.setBody(body.toString());
 888	}
 889
 890	public int getMediaRuntime(Uri uri) {
 891		try {
 892			MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever();
 893			mediaMetadataRetriever.setDataSource(mXmppConnectionService, uri);
 894			return Integer.parseInt(mediaMetadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION));
 895		} catch (RuntimeException e) {
 896			return 0;
 897		}
 898	}
 899
 900	private int getMediaRuntime(File file) {
 901		try {
 902			MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever();
 903			mediaMetadataRetriever.setDataSource(file.toString());
 904			return Integer.parseInt(mediaMetadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION));
 905		} catch (RuntimeException e) {
 906			return 0;
 907		}
 908	}
 909
 910	private Dimensions getImageDimensions(File file) {
 911		BitmapFactory.Options options = new BitmapFactory.Options();
 912		options.inJustDecodeBounds = true;
 913		BitmapFactory.decodeFile(file.getAbsolutePath(), options);
 914		int rotation = getRotation(file);
 915		boolean rotated = rotation == 90 || rotation == 270;
 916		int imageHeight = rotated ? options.outWidth : options.outHeight;
 917		int imageWidth = rotated ? options.outHeight : options.outWidth;
 918		return new Dimensions(imageHeight, imageWidth);
 919	}
 920
 921	private Dimensions getVideoDimensions(File file) throws NotAVideoFile {
 922		MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever();
 923		try {
 924			metadataRetriever.setDataSource(file.getAbsolutePath());
 925		} catch (RuntimeException e) {
 926			throw new NotAVideoFile(e);
 927		}
 928		return getVideoDimensions(metadataRetriever);
 929	}
 930
 931	private static Dimensions getVideoDimensions(Context context, Uri uri) throws NotAVideoFile {
 932		MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever();
 933		try {
 934			mediaMetadataRetriever.setDataSource(context, uri);
 935		} catch (RuntimeException e) {
 936			throw new NotAVideoFile(e);
 937		}
 938		return getVideoDimensions(mediaMetadataRetriever);
 939	}
 940
 941	private static Dimensions getVideoDimensions(MediaMetadataRetriever metadataRetriever) throws NotAVideoFile {
 942		String hasVideo = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_HAS_VIDEO);
 943		if (hasVideo == null) {
 944			throw new NotAVideoFile();
 945		}
 946		int rotation = extractRotationFromMediaRetriever(metadataRetriever);
 947		boolean rotated = rotation == 90 || rotation == 270;
 948		int height;
 949		try {
 950			String h = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT);
 951			height = Integer.parseInt(h);
 952		} catch (Exception e) {
 953			height = -1;
 954		}
 955		int width;
 956		try {
 957			String w = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH);
 958			width = Integer.parseInt(w);
 959		} catch (Exception e) {
 960			width = -1;
 961		}
 962		metadataRetriever.release();
 963		Log.d(Config.LOGTAG, "extracted video dims " + width + "x" + height);
 964		return rotated ? new Dimensions(width, height) : new Dimensions(height, width);
 965	}
 966
 967	private static int extractRotationFromMediaRetriever(MediaMetadataRetriever metadataRetriever) {
 968		int rotation;
 969		if (Build.VERSION.SDK_INT >= 17) {
 970			String r = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_ROTATION);
 971			try {
 972				rotation = Integer.parseInt(r);
 973			} catch (Exception e) {
 974				rotation = 0;
 975			}
 976		} else {
 977			rotation = 0;
 978		}
 979		return rotation;
 980	}
 981
 982	private static class Dimensions {
 983		public final int width;
 984		public final int height;
 985
 986		public Dimensions(int height, int width) {
 987			this.width = width;
 988			this.height = height;
 989		}
 990
 991		public int getMin() {
 992			return Math.min(width, height);
 993		}
 994	}
 995
 996	private static class NotAVideoFile extends Exception {
 997		public NotAVideoFile(Throwable t) {
 998			super(t);
 999		}
1000
1001		public NotAVideoFile() {
1002			super();
1003		}
1004	}
1005
1006	public class FileCopyException extends Exception {
1007		private static final long serialVersionUID = -1010013599132881427L;
1008		private int resId;
1009
1010		public FileCopyException(int resId) {
1011			this.resId = resId;
1012		}
1013
1014		public int getResId() {
1015			return resId;
1016		}
1017	}
1018
1019	public Bitmap getAvatar(String avatar, int size) {
1020		if (avatar == null) {
1021			return null;
1022		}
1023		Bitmap bm = cropCenter(getAvatarUri(avatar), size, size);
1024		if (bm == null) {
1025			return null;
1026		}
1027		return bm;
1028	}
1029
1030	public boolean isFileAvailable(Message message) {
1031		return getFile(message).exists();
1032	}
1033
1034	public static void close(Closeable stream) {
1035		if (stream != null) {
1036			try {
1037				stream.close();
1038			} catch (IOException e) {
1039			}
1040		}
1041	}
1042
1043	public static void close(Socket socket) {
1044		if (socket != null) {
1045			try {
1046				socket.close();
1047			} catch (IOException e) {
1048			}
1049		}
1050	}
1051
1052
1053	public static boolean weOwnFile(Context context, Uri uri) {
1054		if (uri == null || !ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
1055			return false;
1056		} else if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
1057			return fileIsInFilesDir(context, uri);
1058		} else {
1059			return weOwnFileLollipop(uri);
1060		}
1061	}
1062
1063
1064	/**
1065	 * This is more than hacky but probably way better than doing nothing
1066	 * Further 'optimizations' might contain to get the parents of CacheDir and NoBackupDir
1067	 * and check against those as well
1068	 */
1069	private static boolean fileIsInFilesDir(Context context, Uri uri) {
1070		try {
1071			final String haystack = context.getFilesDir().getParentFile().getCanonicalPath();
1072			final String needle = new File(uri.getPath()).getCanonicalPath();
1073			return needle.startsWith(haystack);
1074		} catch (IOException e) {
1075			return false;
1076		}
1077	}
1078
1079	@TargetApi(Build.VERSION_CODES.LOLLIPOP)
1080	private static boolean weOwnFileLollipop(Uri uri) {
1081		try {
1082			File file = new File(uri.getPath());
1083			FileDescriptor fd = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY).getFileDescriptor();
1084			StructStat st = Os.fstat(fd);
1085			return st.st_uid == android.os.Process.myUid();
1086		} catch (FileNotFoundException e) {
1087			return false;
1088		} catch (Exception e) {
1089			return true;
1090		}
1091	}
1092}