1package eu.siacs.conversations.persistance;
  2
  3import android.annotation.TargetApi;
  4import android.content.ContentResolver;
  5import android.content.Context;
  6import android.content.Intent;
  7import android.database.Cursor;
  8import android.graphics.Bitmap;
  9import android.graphics.BitmapFactory;
 10import android.graphics.Canvas;
 11import android.graphics.Matrix;
 12import android.graphics.Paint;
 13import android.graphics.RectF;
 14import android.media.MediaMetadataRetriever;
 15import android.net.Uri;
 16import android.os.Build;
 17import android.os.Environment;
 18import android.os.ParcelFileDescriptor;
 19import android.provider.MediaStore;
 20import android.provider.OpenableColumns;
 21import android.support.v4.content.FileProvider;
 22import android.system.Os;
 23import android.system.StructStat;
 24import android.util.Base64;
 25import android.util.Base64OutputStream;
 26import android.util.Log;
 27import android.util.LruCache;
 28import android.webkit.MimeTypeMap;
 29
 30import java.io.ByteArrayOutputStream;
 31import java.io.Closeable;
 32import java.io.File;
 33import java.io.FileDescriptor;
 34import java.io.FileInputStream;
 35import java.io.FileNotFoundException;
 36import java.io.FileOutputStream;
 37import java.io.IOException;
 38import java.io.InputStream;
 39import java.io.OutputStream;
 40import java.net.Socket;
 41import java.net.URL;
 42import java.security.DigestOutputStream;
 43import java.security.MessageDigest;
 44import java.security.NoSuchAlgorithmException;
 45import java.text.SimpleDateFormat;
 46import java.util.Date;
 47import java.util.List;
 48import java.util.Locale;
 49
 50import eu.siacs.conversations.Config;
 51import eu.siacs.conversations.R;
 52import eu.siacs.conversations.entities.DownloadableFile;
 53import eu.siacs.conversations.entities.Message;
 54import eu.siacs.conversations.services.XmppConnectionService;
 55import eu.siacs.conversations.utils.CryptoHelper;
 56import eu.siacs.conversations.utils.ExifHelper;
 57import eu.siacs.conversations.utils.FileUtils;
 58import eu.siacs.conversations.utils.FileWriterException;
 59import eu.siacs.conversations.utils.MimeUtils;
 60import eu.siacs.conversations.xmpp.pep.Avatar;
 61
 62public class FileBackend {
 63
 64	private static final Object THUMBNAIL_LOCK = new Object();
 65
 66	private static final SimpleDateFormat IMAGE_DATE_FORMAT = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US);
 67
 68	public static final String FILE_PROVIDER = ".files";
 69
 70	private XmppConnectionService mXmppConnectionService;
 71
 72	public FileBackend(XmppConnectionService service) {
 73		this.mXmppConnectionService = service;
 74	}
 75
 76	private void createNoMedia() {
 77		final File nomedia = new File(getConversationsDirectory("Files")+".nomedia");
 78		if (!nomedia.exists()) {
 79			try {
 80				nomedia.createNewFile();
 81			} catch (Exception e) {
 82				Log.d(Config.LOGTAG, "could not create nomedia file");
 83			}
 84		}
 85	}
 86
 87	public void updateMediaScanner(File file) {
 88		String path = file.getAbsolutePath();
 89		if (!path.startsWith(getConversationsDirectory("Files"))) {
 90			Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
 91			intent.setData(Uri.fromFile(file));
 92			mXmppConnectionService.sendBroadcast(intent);
 93		} else {
 94			createNoMedia();
 95		}
 96	}
 97
 98	public boolean deleteFile(Message message) {
 99		File file = getFile(message);
100		if (file.delete()) {
101			updateMediaScanner(file);
102			return true;
103		} else {
104			return false;
105		}
106	}
107
108	public DownloadableFile getFile(Message message) {
109		return getFile(message, true);
110	}
111
112	public DownloadableFile getFile(Message message, boolean decrypted) {
113		final boolean encrypted = !decrypted
114				&& (message.getEncryption() == Message.ENCRYPTION_PGP
115				|| message.getEncryption() == Message.ENCRYPTION_DECRYPTED);
116		final DownloadableFile file;
117		String path = message.getRelativeFilePath();
118		if (path == null) {
119			path = message.getUuid();
120		}
121		if (path.startsWith("/")) {
122			file = new DownloadableFile(path);
123		} else {
124			String mime = message.getMimeType();
125			if (mime != null && mime.startsWith("image/")) {
126				file = new DownloadableFile(getConversationsDirectory("Images") + path);
127			} else if (mime != null && mime.startsWith("video/")) {
128				file = new DownloadableFile(getConversationsDirectory("Videos") + path);
129			} else {
130				file = new DownloadableFile(getConversationsDirectory("Files") + path);
131			}
132		}
133		if (encrypted) {
134			return new DownloadableFile(getConversationsDirectory("Files") + file.getName() + ".pgp");
135		} else {
136			return file;
137		}
138	}
139
140	private static long getFileSize(Context context, Uri uri) {
141		Cursor cursor = context.getContentResolver().query(uri, null, null, null, null);
142		if (cursor != null && cursor.moveToFirst()) {
143			return cursor.getLong(cursor.getColumnIndex(OpenableColumns.SIZE));
144		} else {
145			return -1;
146		}
147	}
148
149	public static boolean allFilesUnderSize(Context context, List<Uri> uris, long max) {
150		if (max <= 0) {
151			Log.d(Config.LOGTAG,"server did not report max file size for http upload");
152			return true; //exception to be compatible with HTTP Upload < v0.2
153		}
154		for(Uri uri : uris) {
155			if (FileBackend.getFileSize(context, uri) > max) {
156				Log.d(Config.LOGTAG,"not all files are under "+max+" bytes. suggesting falling back to jingle");
157				return false;
158			}
159		}
160		return true;
161	}
162
163	public String getConversationsDirectory(final String type) {
164		if (Config.ONLY_INTERNAL_STORAGE) {
165			return mXmppConnectionService.getFilesDir().getAbsolutePath()+"/"+type+"/";
166		} else {
167			return Environment.getExternalStorageDirectory() +"/Conversations/Media/Conversations "+type+"/";
168		}
169	}
170
171	public static String getConversationsLogsDirectory() {
172		return  Environment.getExternalStorageDirectory().getAbsolutePath()+"/Conversations/";
173	}
174
175	public Bitmap resize(Bitmap originalBitmap, int size) {
176		int w = originalBitmap.getWidth();
177		int h = originalBitmap.getHeight();
178		if (Math.max(w, h) > size) {
179			int scalledW;
180			int scalledH;
181			if (w <= h) {
182				scalledW = (int) (w / ((double) h / size));
183				scalledH = size;
184			} else {
185				scalledW = size;
186				scalledH = (int) (h / ((double) w / size));
187			}
188			Bitmap result = Bitmap.createScaledBitmap(originalBitmap, scalledW, scalledH, true);
189			if (originalBitmap != null && !originalBitmap.isRecycled()) {
190				originalBitmap.recycle();
191			}
192			return result;
193		} else {
194			return originalBitmap;
195		}
196	}
197
198	public static Bitmap rotate(Bitmap bitmap, int degree) {
199		if (degree == 0) {
200			return bitmap;
201		}
202		int w = bitmap.getWidth();
203		int h = bitmap.getHeight();
204		Matrix mtx = new Matrix();
205		mtx.postRotate(degree);
206		Bitmap result = Bitmap.createBitmap(bitmap, 0, 0, w, h, mtx, true);
207		if (bitmap != null && !bitmap.isRecycled()) {
208			bitmap.recycle();
209		}
210		return result;
211	}
212
213	public boolean useImageAsIs(Uri uri) {
214		String path = getOriginalPath(uri);
215		if (path == null) {
216			return false;
217		}
218		File file = new File(path);
219		long size = file.length();
220		if (size == 0 || size >= Config.IMAGE_MAX_SIZE ) {
221			return false;
222		}
223		BitmapFactory.Options options = new BitmapFactory.Options();
224		options.inJustDecodeBounds = true;
225		try {
226			BitmapFactory.decodeStream(mXmppConnectionService.getContentResolver().openInputStream(uri), null, options);
227			if (options == null || options.outMimeType == null || options.outHeight <= 0 || options.outWidth <= 0) {
228				return false;
229			}
230			return (options.outWidth <= Config.IMAGE_SIZE && options.outHeight <= Config.IMAGE_SIZE && options.outMimeType.contains(Config.IMAGE_FORMAT.name().toLowerCase()));
231		} catch (FileNotFoundException e) {
232			return false;
233		}
234	}
235
236	public String getOriginalPath(Uri uri) {
237		return FileUtils.getPath(mXmppConnectionService,uri);
238	}
239
240	public void copyFileToPrivateStorage(File file, Uri uri) throws FileCopyException {
241		Log.d(Config.LOGTAG,"copy file ("+uri.toString()+") to private storage "+file.getAbsolutePath());
242		file.getParentFile().mkdirs();
243		OutputStream os = null;
244		InputStream is = null;
245		try {
246			file.createNewFile();
247			os = new FileOutputStream(file);
248			is = mXmppConnectionService.getContentResolver().openInputStream(uri);
249			byte[] buffer = new byte[1024];
250			int length;
251			while ((length = is.read(buffer)) > 0) {
252				try {
253					os.write(buffer, 0, length);
254				} catch (IOException e) {
255					throw new FileWriterException();
256				}
257			}
258			try {
259				os.flush();
260			} catch (IOException e) {
261				throw new FileWriterException();
262			}
263		} catch(FileNotFoundException e) {
264			throw new FileCopyException(R.string.error_file_not_found);
265		} catch(FileWriterException e) {
266			throw new FileCopyException(R.string.error_unable_to_create_temporary_file);
267		} catch (IOException e) {
268			e.printStackTrace();
269			throw new FileCopyException(R.string.error_io_exception);
270		} finally {
271			close(os);
272			close(is);
273		}
274	}
275
276	public void copyFileToPrivateStorage(Message message, Uri uri) throws FileCopyException {
277		String mime = MimeUtils.guessMimeTypeFromUri(mXmppConnectionService, uri);
278		Log.d(Config.LOGTAG, "copy " + uri.toString() + " to private storage (mime="+mime+")");
279		String extension = MimeTypeMap.getSingleton().getExtensionFromMimeType(mime);
280		if (extension == null) {
281			extension = getExtensionFromUri(uri);
282		}
283		message.setRelativeFilePath(message.getUuid() + "." + extension);
284		copyFileToPrivateStorage(mXmppConnectionService.getFileBackend().getFile(message), uri);
285	}
286
287	private String getExtensionFromUri(Uri uri) {
288		String[] projection = {MediaStore.MediaColumns.DATA};
289		String filename = null;
290		Cursor cursor = mXmppConnectionService.getContentResolver().query(uri, projection, null, null, null);
291		if (cursor != null) {
292			try {
293				if (cursor.moveToFirst()) {
294					filename = cursor.getString(0);
295				}
296			} catch (Exception e) {
297				filename = null;
298			} finally {
299				cursor.close();
300			}
301		}
302		int pos = filename == null ? -1 : filename.lastIndexOf('.');
303		return pos > 0 ? filename.substring(pos+1) : null;
304	}
305
306	private void copyImageToPrivateStorage(File file, Uri image, int sampleSize) throws FileCopyException {
307		file.getParentFile().mkdirs();
308		InputStream is = null;
309		OutputStream os = null;
310		try {
311			if (!file.exists() && !file.createNewFile()) {
312				throw new FileCopyException(R.string.error_unable_to_create_temporary_file);
313			}
314			is = mXmppConnectionService.getContentResolver().openInputStream(image);
315			if (is == null) {
316				throw new FileCopyException(R.string.error_not_an_image_file);
317			}
318			Bitmap originalBitmap;
319			BitmapFactory.Options options = new BitmapFactory.Options();
320			int inSampleSize = (int) Math.pow(2, sampleSize);
321			Log.d(Config.LOGTAG, "reading bitmap with sample size " + inSampleSize);
322			options.inSampleSize = inSampleSize;
323			originalBitmap = BitmapFactory.decodeStream(is, null, options);
324			is.close();
325			if (originalBitmap == null) {
326				throw new FileCopyException(R.string.error_not_an_image_file);
327			}
328			Bitmap scaledBitmap = resize(originalBitmap, Config.IMAGE_SIZE);
329			int rotation = getRotation(image);
330			scaledBitmap = rotate(scaledBitmap, rotation);
331			boolean targetSizeReached = false;
332			int quality = Config.IMAGE_QUALITY;
333			while(!targetSizeReached) {
334				os = new FileOutputStream(file);
335				boolean success = scaledBitmap.compress(Config.IMAGE_FORMAT, quality, os);
336				if (!success) {
337					throw new FileCopyException(R.string.error_compressing_image);
338				}
339				os.flush();
340				targetSizeReached = file.length() <= Config.IMAGE_MAX_SIZE || quality <= 50;
341				quality -= 5;
342			}
343			scaledBitmap.recycle();
344		} catch (FileNotFoundException e) {
345			throw new FileCopyException(R.string.error_file_not_found);
346		} catch (IOException e) {
347			e.printStackTrace();
348			throw new FileCopyException(R.string.error_io_exception);
349		} catch (SecurityException e) {
350			throw new FileCopyException(R.string.error_security_exception_during_image_copy);
351		} catch (OutOfMemoryError e) {
352			++sampleSize;
353			if (sampleSize <= 3) {
354				copyImageToPrivateStorage(file, image, sampleSize);
355			} else {
356				throw new FileCopyException(R.string.error_out_of_memory);
357			}
358		} finally {
359			close(os);
360			close(is);
361		}
362	}
363
364	public void copyImageToPrivateStorage(File file, Uri image) throws FileCopyException {
365		Log.d(Config.LOGTAG,"copy image ("+image.toString()+") to private storage "+file.getAbsolutePath());
366		copyImageToPrivateStorage(file, image, 0);
367	}
368
369	public void copyImageToPrivateStorage(Message message, Uri image) throws FileCopyException {
370		switch(Config.IMAGE_FORMAT) {
371			case JPEG:
372				message.setRelativeFilePath(message.getUuid()+".jpg");
373				break;
374			case PNG:
375				message.setRelativeFilePath(message.getUuid()+".png");
376				break;
377			case WEBP:
378				message.setRelativeFilePath(message.getUuid()+".webp");
379				break;
380		}
381		copyImageToPrivateStorage(getFile(message), image);
382		updateFileParams(message);
383	}
384
385	private int getRotation(File file) {
386		return getRotation(Uri.parse("file://"+file.getAbsolutePath()));
387	}
388
389	private int getRotation(Uri image) {
390		InputStream is = null;
391		try {
392			is = mXmppConnectionService.getContentResolver().openInputStream(image);
393			return ExifHelper.getOrientation(is);
394		} catch (FileNotFoundException e) {
395			return 0;
396		} finally {
397			close(is);
398		}
399	}
400
401	public Bitmap getThumbnail(Message message, int size, boolean cacheOnly) throws FileNotFoundException {
402		final String uuid = message.getUuid();
403		final LruCache<String,Bitmap> cache = mXmppConnectionService.getBitmapCache();
404		Bitmap thumbnail = cache.get(uuid);
405		if ((thumbnail == null) && (!cacheOnly)) {
406			synchronized (THUMBNAIL_LOCK) {
407				thumbnail = cache.get(uuid);
408				if (thumbnail != null) {
409					return thumbnail;
410				}
411				DownloadableFile file = getFile(message);
412				final String mime = file.getMimeType();
413				if (mime.startsWith("video/")) {
414					thumbnail = getVideoPreview(file, size);
415				} else {
416					Bitmap fullsize = getFullsizeImagePreview(file, size);
417					if (fullsize == null) {
418						throw new FileNotFoundException();
419					}
420					thumbnail = resize(fullsize, size);
421					thumbnail = rotate(thumbnail, getRotation(file));
422					if (mime.equals("image/gif")) {
423						Bitmap withGifOverlay = thumbnail.copy(Bitmap.Config.ARGB_8888,true);
424						drawOverlay(withGifOverlay,R.drawable.play_gif,1.0f);
425						thumbnail.recycle();
426						thumbnail = withGifOverlay;
427					}
428				}
429				this.mXmppConnectionService.getBitmapCache().put(uuid, thumbnail);
430			}
431		}
432		return thumbnail;
433	}
434
435	private Bitmap getFullsizeImagePreview(File file, int size) {
436		BitmapFactory.Options options = new BitmapFactory.Options();
437		options.inSampleSize = calcSampleSize(file, size);
438		try {
439			return BitmapFactory.decodeFile(file.getAbsolutePath(), options);
440		} catch (OutOfMemoryError e) {
441			options.inSampleSize *= 2;
442			return BitmapFactory.decodeFile(file.getAbsolutePath(), options);
443		}
444	}
445
446	private void drawOverlay(Bitmap bitmap, int resource, float factor) {
447		Bitmap overlay = BitmapFactory.decodeResource(mXmppConnectionService.getResources(), resource);
448		Canvas canvas = new Canvas(bitmap);
449		Paint paint = new Paint();
450		paint.setAntiAlias(true);
451		paint.setFilterBitmap(true);
452		paint.setDither(true);
453		float targetSize = Math.min(canvas.getWidth(),canvas.getHeight()) * factor;
454		Log.d(Config.LOGTAG,"target size overlay: "+targetSize+" overlay bitmap size was "+overlay.getHeight());
455		float left = (canvas.getWidth() - targetSize) / 2.0f;
456		float top = (canvas.getHeight() - targetSize) / 2.0f;
457		RectF dst = new RectF(left,top,left+targetSize-1,top+targetSize-1);
458		canvas.drawBitmap(overlay,null,dst,paint);
459	}
460
461	private Bitmap getVideoPreview(File file, int size) {
462		MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever();
463		Bitmap frame;
464		try {
465			metadataRetriever.setDataSource(file.getAbsolutePath());
466			frame = metadataRetriever.getFrameAtTime(0);
467			metadataRetriever.release();
468			frame = resize(frame, size);
469		} catch(IllegalArgumentException  | NullPointerException e) {
470			frame = Bitmap.createBitmap(size,size, Bitmap.Config.ARGB_8888);
471			frame.eraseColor(0xff000000);
472		}
473		drawOverlay(frame,R.drawable.play_video,0.75f);
474		return frame;
475	}
476
477	private static String getTakePhotoPath() {
478		return Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM)+"/Camera/";
479	}
480
481	public Uri getTakePhotoUri() {
482		File file;
483		if (Config.ONLY_INTERNAL_STORAGE) {
484			file = new File(mXmppConnectionService.getCacheDir().getAbsolutePath(), "Camera/IMG_" + this.IMAGE_DATE_FORMAT.format(new Date()) + ".jpg");
485		} else {
486			file = new File(getTakePhotoPath() + "IMG_" + this.IMAGE_DATE_FORMAT.format(new Date()) + ".jpg");
487		}
488		file.getParentFile().mkdirs();
489		return getUriForFile(mXmppConnectionService,file);
490	}
491
492	public static Uri getUriForFile(Context context, File file) {
493		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N || Config.ONLY_INTERNAL_STORAGE) {
494			try {
495				String packageId = context.getPackageName();
496				return FileProvider.getUriForFile(context, packageId + FILE_PROVIDER, file);
497			} catch(IllegalArgumentException e) {
498				if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
499					throw new SecurityException();
500				} else {
501					return Uri.fromFile(file);
502				}
503			}
504		} else {
505			return Uri.fromFile(file);
506		}
507	}
508
509	public static Uri getIndexableTakePhotoUri(Uri original) {
510		if (Config.ONLY_INTERNAL_STORAGE || "file".equals(original.getScheme())) {
511			return original;
512		} else {
513			List<String> segments = original.getPathSegments();
514			return Uri.parse("file://"+getTakePhotoPath()+segments.get(segments.size() - 1));
515		}
516	}
517
518	public Avatar getPepAvatar(Uri image, int size, Bitmap.CompressFormat format) {
519		try {
520			Avatar avatar = new Avatar();
521			Bitmap bm = cropCenterSquare(image, size);
522			if (bm == null) {
523				return null;
524			}
525			ByteArrayOutputStream mByteArrayOutputStream = new ByteArrayOutputStream();
526			Base64OutputStream mBase64OutputStream = new Base64OutputStream(
527					mByteArrayOutputStream, Base64.DEFAULT);
528			MessageDigest digest = MessageDigest.getInstance("SHA-1");
529			DigestOutputStream mDigestOutputStream = new DigestOutputStream(
530					mBase64OutputStream, digest);
531			if (!bm.compress(format, 75, mDigestOutputStream)) {
532				return null;
533			}
534			mDigestOutputStream.flush();
535			mDigestOutputStream.close();
536			avatar.sha1sum = CryptoHelper.bytesToHex(digest.digest());
537			avatar.image = new String(mByteArrayOutputStream.toByteArray());
538			return avatar;
539		} catch (NoSuchAlgorithmException e) {
540			return null;
541		} catch (IOException e) {
542			return null;
543		}
544	}
545
546	public Avatar getStoredPepAvatar(String hash) {
547		if (hash == null) {
548			return null;
549		}
550		Avatar avatar = new Avatar();
551		File file = new File(getAvatarPath(hash));
552		FileInputStream is = null;
553		try {
554			avatar.size = file.length();
555			BitmapFactory.Options options = new BitmapFactory.Options();
556			options.inJustDecodeBounds = true;
557			BitmapFactory.decodeFile(file.getAbsolutePath(), options);
558			is = new FileInputStream(file);
559			ByteArrayOutputStream mByteArrayOutputStream = new ByteArrayOutputStream();
560			Base64OutputStream mBase64OutputStream = new Base64OutputStream(mByteArrayOutputStream, Base64.DEFAULT);
561			MessageDigest digest = MessageDigest.getInstance("SHA-1");
562			DigestOutputStream os = new DigestOutputStream(mBase64OutputStream, digest);
563			byte[] buffer = new byte[4096];
564			int length;
565			while ((length = is.read(buffer)) > 0) {
566				os.write(buffer, 0, length);
567			}
568			os.flush();
569			os.close();
570			avatar.sha1sum = CryptoHelper.bytesToHex(digest.digest());
571			avatar.image = new String(mByteArrayOutputStream.toByteArray());
572			avatar.height = options.outHeight;
573			avatar.width = options.outWidth;
574			avatar.type = options.outMimeType;
575			return avatar;
576		} catch (IOException e) {
577			return null;
578		} catch (NoSuchAlgorithmException e) {
579			return null;
580		} finally {
581			close(is);
582		}
583	}
584
585	public boolean isAvatarCached(Avatar avatar) {
586		File file = new File(getAvatarPath(avatar.getFilename()));
587		return file.exists();
588	}
589
590	public boolean save(Avatar avatar) {
591		File file;
592		if (isAvatarCached(avatar)) {
593			file = new File(getAvatarPath(avatar.getFilename()));
594			avatar.size = file.length();
595		} else {
596			String filename = getAvatarPath(avatar.getFilename());
597			file = new File(filename + ".tmp");
598			file.getParentFile().mkdirs();
599			OutputStream os = null;
600			try {
601				file.createNewFile();
602				os = new FileOutputStream(file);
603				MessageDigest digest = MessageDigest.getInstance("SHA-1");
604				digest.reset();
605				DigestOutputStream mDigestOutputStream = new DigestOutputStream(os, digest);
606				final byte[] bytes = avatar.getImageAsBytes();
607				mDigestOutputStream.write(bytes);
608				mDigestOutputStream.flush();
609				mDigestOutputStream.close();
610				String sha1sum = CryptoHelper.bytesToHex(digest.digest());
611				if (sha1sum.equals(avatar.sha1sum)) {
612					file.renameTo(new File(filename));
613				} else {
614					Log.d(Config.LOGTAG, "sha1sum mismatch for " + avatar.owner);
615					file.delete();
616					return false;
617				}
618				avatar.size = bytes.length;
619			} catch (IllegalArgumentException | IOException | NoSuchAlgorithmException e) {
620				return false;
621			} finally {
622				close(os);
623			}
624		}
625		return true;
626	}
627
628	public String getAvatarPath(String avatar) {
629		return mXmppConnectionService.getFilesDir().getAbsolutePath()+ "/avatars/" + avatar;
630	}
631
632	public Uri getAvatarUri(String avatar) {
633		return Uri.parse("file:" + getAvatarPath(avatar));
634	}
635
636	public Bitmap cropCenterSquare(Uri image, int size) {
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, size);
644			is = mXmppConnectionService.getContentResolver().openInputStream(image);
645			if (is == null) {
646				return null;
647			}
648			Bitmap input = BitmapFactory.decodeStream(is, null, options);
649			if (input == null) {
650				return null;
651			} else {
652				input = rotate(input, getRotation(image));
653				return cropCenterSquare(input, size);
654			}
655		} catch (SecurityException e) {
656			return null; // happens for example on Android 6.0 if contacts permissions get revoked
657		} catch (FileNotFoundException e) {
658			return null;
659		} finally {
660			close(is);
661		}
662	}
663
664	public Bitmap cropCenter(Uri image, int newHeight, int newWidth) {
665		if (image == null) {
666			return null;
667		}
668		InputStream is = null;
669		try {
670			BitmapFactory.Options options = new BitmapFactory.Options();
671			options.inSampleSize = calcSampleSize(image, Math.max(newHeight, newWidth));
672			is = mXmppConnectionService.getContentResolver().openInputStream(image);
673			if (is == null) {
674				return null;
675			}
676			Bitmap source = BitmapFactory.decodeStream(is, null, options);
677			if (source == null) {
678				return null;
679			}
680			int sourceWidth = source.getWidth();
681			int sourceHeight = source.getHeight();
682			float xScale = (float) newWidth / sourceWidth;
683			float yScale = (float) newHeight / sourceHeight;
684			float scale = Math.max(xScale, yScale);
685			float scaledWidth = scale * sourceWidth;
686			float scaledHeight = scale * sourceHeight;
687			float left = (newWidth - scaledWidth) / 2;
688			float top = (newHeight - scaledHeight) / 2;
689
690			RectF targetRect = new RectF(left, top, left + scaledWidth, top + scaledHeight);
691			Bitmap dest = Bitmap.createBitmap(newWidth, newHeight, Bitmap.Config.ARGB_8888);
692			Canvas canvas = new Canvas(dest);
693			canvas.drawBitmap(source, null, targetRect, null);
694			if (source.isRecycled()) {
695				source.recycle();
696			}
697			return dest;
698		} catch (SecurityException e) {
699			return null; //android 6.0 with revoked permissions for example
700		} catch (FileNotFoundException e) {
701			return null;
702		} finally {
703			close(is);
704		}
705	}
706
707	public Bitmap cropCenterSquare(Bitmap input, int size) {
708		int w = input.getWidth();
709		int h = input.getHeight();
710
711		float scale = Math.max((float) size / h, (float) size / w);
712
713		float outWidth = scale * w;
714		float outHeight = scale * h;
715		float left = (size - outWidth) / 2;
716		float top = (size - outHeight) / 2;
717		RectF target = new RectF(left, top, left + outWidth, top + outHeight);
718
719		Bitmap output = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
720		Canvas canvas = new Canvas(output);
721		canvas.drawBitmap(input, null, target, null);
722		if (input != null && !input.isRecycled()) {
723			input.recycle();
724		}
725		return output;
726	}
727
728	private int calcSampleSize(Uri image, int size) throws FileNotFoundException, SecurityException {
729		BitmapFactory.Options options = new BitmapFactory.Options();
730		options.inJustDecodeBounds = true;
731		BitmapFactory.decodeStream(mXmppConnectionService.getContentResolver().openInputStream(image), null, options);
732		return calcSampleSize(options, size);
733	}
734
735	private static int calcSampleSize(File image, int size) {
736		BitmapFactory.Options options = new BitmapFactory.Options();
737		options.inJustDecodeBounds = true;
738		BitmapFactory.decodeFile(image.getAbsolutePath(), options);
739		return calcSampleSize(options, size);
740	}
741
742	public static int calcSampleSize(BitmapFactory.Options options, int size) {
743		int height = options.outHeight;
744		int width = options.outWidth;
745		int inSampleSize = 1;
746
747		if (height > size || width > size) {
748			int halfHeight = height / 2;
749			int halfWidth = width / 2;
750
751			while ((halfHeight / inSampleSize) > size
752					&& (halfWidth / inSampleSize) > size) {
753				inSampleSize *= 2;
754			}
755		}
756		return inSampleSize;
757	}
758
759	public void updateFileParams(Message message) {
760		updateFileParams(message,null);
761	}
762
763	public void updateFileParams(Message message, URL url) {
764		DownloadableFile file = getFile(message);
765		final String mime = file.getMimeType();
766		boolean image = message.getType() == Message.TYPE_IMAGE || (mime != null && mime.startsWith("image/"));
767		boolean video = mime != null && mime.startsWith("video/");
768		if (image || video) {
769			try {
770				Dimensions dimensions = image ? getImageDimensions(file) : getVideoDimensions(file);
771				if (url == null) {
772					message.setBody(Long.toString(file.getSize()) + '|' + dimensions.width + '|' + dimensions.height);
773				} else {
774					message.setBody(url.toString() + "|" + Long.toString(file.getSize()) + '|' + dimensions.width + '|' + dimensions.height);
775				}
776				return;
777			} catch (NotAVideoFile notAVideoFile) {
778				Log.d(Config.LOGTAG,"file with mime type "+file.getMimeType()+" was not a video file");
779				//fall threw
780			}
781		}
782		if (url != null) {
783			message.setBody(url.toString()+"|"+Long.toString(file.getSize()));
784		} else {
785			message.setBody(Long.toString(file.getSize()));
786		}
787
788	}
789
790	private Dimensions getImageDimensions(File file) {
791		BitmapFactory.Options options = new BitmapFactory.Options();
792		options.inJustDecodeBounds = true;
793		BitmapFactory.decodeFile(file.getAbsolutePath(), options);
794		int rotation = getRotation(file);
795		boolean rotated = rotation == 90 || rotation == 270;
796		int imageHeight = rotated ? options.outWidth : options.outHeight;
797		int imageWidth = rotated ? options.outHeight : options.outWidth;
798		return new Dimensions(imageHeight, imageWidth);
799	}
800
801	private Dimensions getVideoDimensions(File file) throws NotAVideoFile {
802		MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever();
803		try {
804			metadataRetriever.setDataSource(file.getAbsolutePath());
805		} catch (Exception e) {
806			throw new NotAVideoFile();
807		}
808		String hasVideo = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_HAS_VIDEO);
809		if (hasVideo == null) {
810			throw new NotAVideoFile();
811		}
812		int rotation = extractRotationFromMediaRetriever(metadataRetriever);
813		boolean rotated = rotation == 90 || rotation == 270;
814		int height;
815		try {
816			String h = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT);
817			height = Integer.parseInt(h);
818		} catch (Exception e) {
819			height = -1;
820		}
821		int width;
822		try {
823			String w = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH);
824			width = Integer.parseInt(w);
825		} catch (Exception e) {
826			width = -1;
827		}
828		metadataRetriever.release();
829		Log.d(Config.LOGTAG,"extracted video dims "+width+"x"+height);
830		return rotated ? new Dimensions(width, height) : new Dimensions(height, width);
831	}
832
833	private int extractRotationFromMediaRetriever(MediaMetadataRetriever metadataRetriever) {
834		int rotation;
835		if (Build.VERSION.SDK_INT >= 17) {
836			String r = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_ROTATION);
837			try {
838				rotation = Integer.parseInt(r);
839			} catch (Exception e) {
840				rotation = 0;
841			}
842		} else {
843			rotation = 0;
844		}
845		return rotation;
846	}
847
848	private class Dimensions {
849		public final int width;
850		public final int height;
851
852		public Dimensions(int height, int width) {
853			this.width = width;
854			this.height = height;
855		}
856	}
857
858	private class NotAVideoFile extends Exception {
859
860	}
861
862	public class FileCopyException extends Exception {
863		private static final long serialVersionUID = -1010013599132881427L;
864		private int resId;
865
866		public FileCopyException(int resId) {
867			this.resId = resId;
868		}
869
870		public int getResId() {
871			return resId;
872		}
873	}
874
875	public Bitmap getAvatar(String avatar, int size) {
876		if (avatar == null) {
877			return null;
878		}
879		Bitmap bm = cropCenter(getAvatarUri(avatar), size, size);
880		if (bm == null) {
881			return null;
882		}
883		return bm;
884	}
885
886	public boolean isFileAvailable(Message message) {
887		return getFile(message).exists();
888	}
889
890	public static void close(Closeable stream) {
891		if (stream != null) {
892			try {
893				stream.close();
894			} catch (IOException e) {
895			}
896		}
897	}
898
899	public static void close(Socket socket) {
900		if (socket != null) {
901			try {
902				socket.close();
903			} catch (IOException e) {
904			}
905		}
906	}
907
908
909	public static boolean weOwnFile(Context context, Uri uri) {
910		if (uri == null || !ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
911			return false;
912		} else if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
913			return fileIsInFilesDir(context, uri);
914		} else {
915			return weOwnFileLollipop(uri);
916		}
917	}
918
919
920	/**
921	 * This is more than hacky but probably way better than doing nothing
922	 * Further 'optimizations' might contain to get the parents of CacheDir and NoBackupDir
923	 * and check against those as well
924	 */
925	private static boolean fileIsInFilesDir(Context context, Uri uri) {
926		try {
927			final String haystack = context.getFilesDir().getParentFile().getCanonicalPath();
928			final String needle = new File(uri.getPath()).getCanonicalPath();
929			return needle.startsWith(haystack);
930		} catch (IOException e) {
931			return false;
932		}
933	}
934
935	@TargetApi(Build.VERSION_CODES.LOLLIPOP)
936	private static boolean weOwnFileLollipop(Uri uri) {
937		try {
938			File file = new File(uri.getPath());
939			FileDescriptor fd = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY).getFileDescriptor();
940			StructStat st = Os.fstat(fd);
941			return st.st_uid == android.os.Process.myUid();
942		} catch (FileNotFoundException e) {
943			return false;
944		} catch (Exception e) {
945			return true;
946		}
947	}
948}