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