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