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