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