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