package eu.siacs.conversations.persistance; import android.annotation.TargetApi; import android.content.ContentResolver; import android.content.Context; import android.content.Intent; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Matrix; import android.graphics.RectF; import android.media.MediaMetadataRetriever; import android.net.Uri; import android.os.Build; import android.os.Environment; import android.os.FileObserver; import android.os.ParcelFileDescriptor; import android.provider.MediaStore; import android.provider.OpenableColumns; import android.support.v4.content.FileProvider; import android.system.Os; import android.system.StructStat; import android.util.Base64; import android.util.Base64OutputStream; import android.util.Log; import android.util.LruCache; import android.webkit.MimeTypeMap; import java.io.ByteArrayOutputStream; import java.io.Closeable; import java.io.File; import java.io.FileDescriptor; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.Socket; import java.net.URL; import java.security.DigestOutputStream; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.List; import java.util.Locale; import eu.siacs.conversations.Config; import eu.siacs.conversations.R; import eu.siacs.conversations.entities.DownloadableFile; import eu.siacs.conversations.entities.Message; import eu.siacs.conversations.services.XmppConnectionService; import eu.siacs.conversations.utils.CryptoHelper; import eu.siacs.conversations.utils.ExifHelper; import eu.siacs.conversations.utils.FileUtils; import eu.siacs.conversations.xmpp.pep.Avatar; public class FileBackend { private final SimpleDateFormat imageDateFormat = new SimpleDateFormat("yyyyMMdd_HHmmssSSS", Locale.US); private XmppConnectionService mXmppConnectionService; public FileBackend(XmppConnectionService service) { this.mXmppConnectionService = service; } private void createNoMedia() { final File nomedia = new File(getConversationsFileDirectory()+".nomedia"); if (!nomedia.exists()) { try { nomedia.createNewFile(); } catch (Exception e) { Log.d(Config.LOGTAG, "could not create nomedia file"); } } } public void updateMediaScanner(File file) { if (file.getAbsolutePath().startsWith(getConversationsImageDirectory())) { Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); intent.setData(Uri.fromFile(file)); mXmppConnectionService.sendBroadcast(intent); } else { createNoMedia(); } } public boolean deleteFile(Message message) { File file = getFile(message); if (file.delete()) { updateMediaScanner(file); return true; } else { return false; } } public DownloadableFile getFile(Message message) { return getFile(message, true); } public DownloadableFile getFile(Message message, boolean decrypted) { final boolean encrypted = !decrypted && (message.getEncryption() == Message.ENCRYPTION_PGP || message.getEncryption() == Message.ENCRYPTION_DECRYPTED); final DownloadableFile file; String path = message.getRelativeFilePath(); if (path == null) { path = message.getUuid(); } if (path.startsWith("/")) { file = new DownloadableFile(path); } else { String mime = message.getMimeType(); if (mime != null && mime.startsWith("image")) { file = new DownloadableFile(getConversationsImageDirectory() + path); } else { file = new DownloadableFile(getConversationsFileDirectory() + path); } } if (encrypted) { return new DownloadableFile(getConversationsFileDirectory() + file.getName() + ".pgp"); } else { return file; } } private static long getFileSize(Context context, Uri uri) { Cursor cursor = context.getContentResolver().query(uri, null, null, null, null); if (cursor != null && cursor.moveToFirst()) { return cursor.getLong(cursor.getColumnIndex(OpenableColumns.SIZE)); } else { return -1; } } public static boolean allFilesUnderSize(Context context, List uris, long max) { if (max <= 0) { Log.d(Config.LOGTAG,"server did not report max file size for http upload"); return true; //exception to be compatible with HTTP Upload < v0.2 } for(Uri uri : uris) { if (FileBackend.getFileSize(context, uri) > max) { Log.d(Config.LOGTAG,"not all files are under "+max+" bytes. suggesting falling back to jingle"); return false; } } return true; } public static String getConversationsFileDirectory() { return Environment.getExternalStorageDirectory().getAbsolutePath()+"/Conversations/"; } public static String getConversationsImageDirectory() { return Environment.getExternalStoragePublicDirectory( Environment.DIRECTORY_PICTURES).getAbsolutePath() + "/Conversations/"; } public Bitmap resize(Bitmap originalBitmap, int size) { int w = originalBitmap.getWidth(); int h = originalBitmap.getHeight(); if (Math.max(w, h) > size) { int scalledW; int scalledH; if (w <= h) { scalledW = (int) (w / ((double) h / size)); scalledH = size; } else { scalledW = size; scalledH = (int) (h / ((double) w / size)); } Bitmap result = Bitmap.createScaledBitmap(originalBitmap, scalledW, scalledH, true); if (originalBitmap != null && !originalBitmap.isRecycled()) { originalBitmap.recycle(); } return result; } else { return originalBitmap; } } public static Bitmap rotate(Bitmap bitmap, int degree) { if (degree == 0) { return bitmap; } int w = bitmap.getWidth(); int h = bitmap.getHeight(); Matrix mtx = new Matrix(); mtx.postRotate(degree); Bitmap result = Bitmap.createBitmap(bitmap, 0, 0, w, h, mtx, true); if (bitmap != null && !bitmap.isRecycled()) { bitmap.recycle(); } return result; } public boolean useImageAsIs(Uri uri) { String path = getOriginalPath(uri); if (path == null) { return false; } File file = new File(path); long size = file.length(); if (size == 0 || size >= Config.IMAGE_MAX_SIZE ) { return false; } BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; try { BitmapFactory.decodeStream(mXmppConnectionService.getContentResolver().openInputStream(uri), null, options); if (options == null || options.outMimeType == null || options.outHeight <= 0 || options.outWidth <= 0) { return false; } return (options.outWidth <= Config.IMAGE_SIZE && options.outHeight <= Config.IMAGE_SIZE && options.outMimeType.contains(Config.IMAGE_FORMAT.name().toLowerCase())); } catch (FileNotFoundException e) { return false; } } public String getOriginalPath(Uri uri) { return FileUtils.getPath(mXmppConnectionService,uri); } public void copyFileToPrivateStorage(File file, Uri uri) throws FileCopyException { file.getParentFile().mkdirs(); OutputStream os = null; InputStream is = null; try { file.createNewFile(); os = new FileOutputStream(file); is = mXmppConnectionService.getContentResolver().openInputStream(uri); byte[] buffer = new byte[1024]; int length; while ((length = is.read(buffer)) > 0) { os.write(buffer, 0, length); } os.flush(); } catch(FileNotFoundException e) { throw new FileCopyException(R.string.error_file_not_found); } catch (IOException e) { e.printStackTrace(); throw new FileCopyException(R.string.error_io_exception); } finally { close(os); close(is); } Log.d(Config.LOGTAG, "output file name " + file.getAbsolutePath()); } public void copyFileToPrivateStorage(Message message, Uri uri) throws FileCopyException { String mime = mXmppConnectionService.getContentResolver().getType(uri); Log.d(Config.LOGTAG, "copy " + uri.toString() + " to private storage (mime="+mime+")"); String extension = MimeTypeMap.getSingleton().getExtensionFromMimeType(mime); if (extension == null) { extension = getExtensionFromUri(uri); } message.setRelativeFilePath(message.getUuid() + "." + extension); copyFileToPrivateStorage(mXmppConnectionService.getFileBackend().getFile(message), uri); } private String getExtensionFromUri(Uri uri) { String[] projection = {MediaStore.MediaColumns.DATA}; String filename = null; Cursor cursor = mXmppConnectionService.getContentResolver().query(uri, projection, null, null, null); if (cursor != null) { try { if (cursor.moveToFirst()) { filename = cursor.getString(0); } } catch (Exception e) { filename = null; } finally { cursor.close(); } } int pos = filename == null ? -1 : filename.lastIndexOf('.'); return pos > 0 ? filename.substring(pos+1) : null; } private void copyImageToPrivateStorage(File file, Uri image, int sampleSize) throws FileCopyException { file.getParentFile().mkdirs(); InputStream is = null; OutputStream os = null; try { file.createNewFile(); is = mXmppConnectionService.getContentResolver().openInputStream(image); Bitmap originalBitmap; BitmapFactory.Options options = new BitmapFactory.Options(); int inSampleSize = (int) Math.pow(2, sampleSize); Log.d(Config.LOGTAG, "reading bitmap with sample size " + inSampleSize); options.inSampleSize = inSampleSize; originalBitmap = BitmapFactory.decodeStream(is, null, options); is.close(); if (originalBitmap == null) { throw new FileCopyException(R.string.error_not_an_image_file); } Bitmap scaledBitmap = resize(originalBitmap, Config.IMAGE_SIZE); int rotation = getRotation(image); scaledBitmap = rotate(scaledBitmap, rotation); boolean targetSizeReached = false; int quality = Config.IMAGE_QUALITY; while(!targetSizeReached) { os = new FileOutputStream(file); boolean success = scaledBitmap.compress(Config.IMAGE_FORMAT, quality, os); if (!success) { throw new FileCopyException(R.string.error_compressing_image); } os.flush(); targetSizeReached = file.length() <= Config.IMAGE_MAX_SIZE || quality <= 50; quality -= 5; } scaledBitmap.recycle(); return; } catch (FileNotFoundException e) { throw new FileCopyException(R.string.error_file_not_found); } catch (IOException e) { e.printStackTrace(); throw new FileCopyException(R.string.error_io_exception); } catch (SecurityException e) { throw new FileCopyException(R.string.error_security_exception_during_image_copy); } catch (OutOfMemoryError e) { ++sampleSize; if (sampleSize <= 3) { copyImageToPrivateStorage(file, image, sampleSize); } else { throw new FileCopyException(R.string.error_out_of_memory); } } catch (NullPointerException e) { throw new FileCopyException(R.string.error_io_exception); } finally { close(os); close(is); } } public void copyImageToPrivateStorage(File file, Uri image) throws FileCopyException { copyImageToPrivateStorage(file, image, 0); } public void copyImageToPrivateStorage(Message message, Uri image) throws FileCopyException { switch(Config.IMAGE_FORMAT) { case JPEG: message.setRelativeFilePath(message.getUuid()+".jpg"); break; case PNG: message.setRelativeFilePath(message.getUuid()+".png"); break; case WEBP: message.setRelativeFilePath(message.getUuid()+".webp"); break; } copyImageToPrivateStorage(getFile(message), image); updateFileParams(message); } private int getRotation(File file) { return getRotation(Uri.parse("file://"+file.getAbsolutePath())); } private int getRotation(Uri image) { InputStream is = null; try { is = mXmppConnectionService.getContentResolver().openInputStream(image); return ExifHelper.getOrientation(is); } catch (FileNotFoundException e) { return 0; } finally { close(is); } } public Bitmap getThumbnail(Message message, int size, boolean cacheOnly) throws FileNotFoundException { final String uuid = message.getUuid(); final LruCache cache = mXmppConnectionService.getBitmapCache(); Bitmap thumbnail = cache.get(uuid); if ((thumbnail == null) && (!cacheOnly)) { synchronized (cache) { thumbnail = cache.get(uuid); if (thumbnail != null) { return thumbnail; } DownloadableFile file = getFile(message); if (file.getMimeType().startsWith("video/")) { thumbnail = getVideoPreview(file, size); } else { Bitmap fullsize = getFullsizeImagePreview(file, size); if (fullsize == null) { throw new FileNotFoundException(); } thumbnail = resize(fullsize, size); thumbnail = rotate(thumbnail, getRotation(file)); } this.mXmppConnectionService.getBitmapCache().put(uuid, thumbnail); } } return thumbnail; } private Bitmap getFullsizeImagePreview(File file, int size) { BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize = calcSampleSize(file, size); try { return BitmapFactory.decodeFile(file.getAbsolutePath(), options); } catch (OutOfMemoryError e) { options.inSampleSize *= 2; return BitmapFactory.decodeFile(file.getAbsolutePath(), options); } } private Bitmap getVideoPreview(File file, int size) { MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever(); Bitmap frame; try { metadataRetriever.setDataSource(file.getAbsolutePath()); frame = metadataRetriever.getFrameAtTime(0); metadataRetriever.release(); frame = resize(frame, size); } catch(IllegalArgumentException | NullPointerException e) { frame = Bitmap.createBitmap(size,size, Bitmap.Config.ARGB_8888); frame.eraseColor(0xff000000); } Canvas canvas = new Canvas(frame); Bitmap play = BitmapFactory.decodeResource(mXmppConnectionService.getResources(), R.drawable.play_video); float x = (frame.getWidth() - play.getWidth()) / 2.0f; float y = (frame.getHeight() - play.getHeight()) / 2.0f; canvas.drawBitmap(play,x,y,null); return frame; } public Uri getTakePhotoUri() { StringBuilder pathBuilder = new StringBuilder(); pathBuilder.append(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM)); pathBuilder.append('/'); pathBuilder.append("Camera"); pathBuilder.append('/'); pathBuilder.append("IMG_" + this.imageDateFormat.format(new Date()) + ".jpg"); File file = new File(pathBuilder.toString()); file.getParentFile().mkdirs(); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { return FileProvider.getUriForFile(mXmppConnectionService, "eu.siacs.conversations.files", file); } else { return Uri.fromFile(file); } } public Avatar getPepAvatar(Uri image, int size, Bitmap.CompressFormat format) { try { Avatar avatar = new Avatar(); Bitmap bm = cropCenterSquare(image, size); if (bm == null) { return null; } ByteArrayOutputStream mByteArrayOutputStream = new ByteArrayOutputStream(); Base64OutputStream mBase64OutputStream = new Base64OutputStream( mByteArrayOutputStream, Base64.DEFAULT); MessageDigest digest = MessageDigest.getInstance("SHA-1"); DigestOutputStream mDigestOutputStream = new DigestOutputStream( mBase64OutputStream, digest); if (!bm.compress(format, 75, mDigestOutputStream)) { return null; } mDigestOutputStream.flush(); mDigestOutputStream.close(); avatar.sha1sum = CryptoHelper.bytesToHex(digest.digest()); avatar.image = new String(mByteArrayOutputStream.toByteArray()); return avatar; } catch (NoSuchAlgorithmException e) { return null; } catch (IOException e) { return null; } } public Avatar getStoredPepAvatar(String hash) { if (hash == null) { return null; } Avatar avatar = new Avatar(); File file = new File(getAvatarPath(hash)); FileInputStream is = null; try { BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; BitmapFactory.decodeFile(file.getAbsolutePath(), options); is = new FileInputStream(file); ByteArrayOutputStream mByteArrayOutputStream = new ByteArrayOutputStream(); Base64OutputStream mBase64OutputStream = new Base64OutputStream(mByteArrayOutputStream, Base64.DEFAULT); MessageDigest digest = MessageDigest.getInstance("SHA-1"); DigestOutputStream os = new DigestOutputStream(mBase64OutputStream, digest); byte[] buffer = new byte[4096]; int length; while ((length = is.read(buffer)) > 0) { os.write(buffer, 0, length); } os.flush(); os.close(); avatar.sha1sum = CryptoHelper.bytesToHex(digest.digest()); avatar.image = new String(mByteArrayOutputStream.toByteArray()); avatar.height = options.outHeight; avatar.width = options.outWidth; return avatar; } catch (IOException e) { return null; } catch (NoSuchAlgorithmException e) { return null; } finally { close(is); } } public boolean isAvatarCached(Avatar avatar) { File file = new File(getAvatarPath(avatar.getFilename())); return file.exists(); } public boolean save(Avatar avatar) { File file; if (isAvatarCached(avatar)) { file = new File(getAvatarPath(avatar.getFilename())); } else { String filename = getAvatarPath(avatar.getFilename()); file = new File(filename + ".tmp"); file.getParentFile().mkdirs(); OutputStream os = null; try { file.createNewFile(); os = new FileOutputStream(file); MessageDigest digest = MessageDigest.getInstance("SHA-1"); digest.reset(); DigestOutputStream mDigestOutputStream = new DigestOutputStream(os, digest); mDigestOutputStream.write(avatar.getImageAsBytes()); mDigestOutputStream.flush(); mDigestOutputStream.close(); String sha1sum = CryptoHelper.bytesToHex(digest.digest()); if (sha1sum.equals(avatar.sha1sum)) { file.renameTo(new File(filename)); } else { Log.d(Config.LOGTAG, "sha1sum mismatch for " + avatar.owner); file.delete(); return false; } } catch (IllegalArgumentException | IOException | NoSuchAlgorithmException e) { return false; } finally { close(os); } } avatar.size = file.length(); return true; } public String getAvatarPath(String avatar) { return mXmppConnectionService.getFilesDir().getAbsolutePath()+ "/avatars/" + avatar; } public Uri getAvatarUri(String avatar) { return Uri.parse("file:" + getAvatarPath(avatar)); } public Bitmap cropCenterSquare(Uri image, int size) { if (image == null) { return null; } InputStream is = null; try { BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize = calcSampleSize(image, size); is = mXmppConnectionService.getContentResolver().openInputStream(image); if (is == null) { return null; } Bitmap input = BitmapFactory.decodeStream(is, null, options); if (input == null) { return null; } else { input = rotate(input, getRotation(image)); return cropCenterSquare(input, size); } } catch (SecurityException e) { return null; // happens for example on Android 6.0 if contacts permissions get revoked } catch (FileNotFoundException e) { return null; } finally { close(is); } } public Bitmap cropCenter(Uri image, int newHeight, int newWidth) { if (image == null) { return null; } InputStream is = null; try { BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize = calcSampleSize(image, Math.max(newHeight, newWidth)); is = mXmppConnectionService.getContentResolver().openInputStream(image); if (is == null) { return null; } Bitmap source = BitmapFactory.decodeStream(is, null, options); if (source == null) { return null; } int sourceWidth = source.getWidth(); int sourceHeight = source.getHeight(); float xScale = (float) newWidth / sourceWidth; float yScale = (float) newHeight / sourceHeight; float scale = Math.max(xScale, yScale); float scaledWidth = scale * sourceWidth; float scaledHeight = scale * sourceHeight; float left = (newWidth - scaledWidth) / 2; float top = (newHeight - scaledHeight) / 2; RectF targetRect = new RectF(left, top, left + scaledWidth, top + scaledHeight); Bitmap dest = Bitmap.createBitmap(newWidth, newHeight, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(dest); canvas.drawBitmap(source, null, targetRect, null); if (source != null && !source.isRecycled()) { source.recycle(); } return dest; } catch (SecurityException e) { return null; //android 6.0 with revoked permissions for example } catch (FileNotFoundException e) { return null; } finally { close(is); } } public Bitmap cropCenterSquare(Bitmap input, int size) { int w = input.getWidth(); int h = input.getHeight(); float scale = Math.max((float) size / h, (float) size / w); float outWidth = scale * w; float outHeight = scale * h; float left = (size - outWidth) / 2; float top = (size - outHeight) / 2; RectF target = new RectF(left, top, left + outWidth, top + outHeight); Bitmap output = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(output); canvas.drawBitmap(input, null, target, null); if (input != null && !input.isRecycled()) { input.recycle(); } return output; } private int calcSampleSize(Uri image, int size) throws FileNotFoundException, SecurityException { BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; BitmapFactory.decodeStream(mXmppConnectionService.getContentResolver().openInputStream(image), null, options); return calcSampleSize(options, size); } private static int calcSampleSize(File image, int size) { BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; BitmapFactory.decodeFile(image.getAbsolutePath(), options); return calcSampleSize(options, size); } public static int calcSampleSize(BitmapFactory.Options options, int size) { int height = options.outHeight; int width = options.outWidth; int inSampleSize = 1; if (height > size || width > size) { int halfHeight = height / 2; int halfWidth = width / 2; while ((halfHeight / inSampleSize) > size && (halfWidth / inSampleSize) > size) { inSampleSize *= 2; } } return inSampleSize; } public Uri getJingleFileUri(Message message) { File file = getFile(message); return Uri.parse("file://" + file.getAbsolutePath()); } public void updateFileParams(Message message) { updateFileParams(message,null); } public void updateFileParams(Message message, URL url) { DownloadableFile file = getFile(message); final String mime = file.getMimeType(); boolean image = message.getType() == Message.TYPE_IMAGE || (mime != null && mime.startsWith("image/")); boolean video = mime != null && mime.startsWith("video/"); if (image || video) { try { Dimensions dimensions = image ? getImageDimensions(file) : getVideoDimensions(file); if (url == null) { message.setBody(Long.toString(file.getSize()) + '|' + dimensions.width + '|' + dimensions.height); } else { message.setBody(url.toString() + "|" + Long.toString(file.getSize()) + '|' + dimensions.width + '|' + dimensions.height); } return; } catch (NotAVideoFile notAVideoFile) { Log.d(Config.LOGTAG,"file with mime type "+file.getMimeType()+" was not a video file"); //fall threw } } if (url != null) { message.setBody(url.toString()+"|"+Long.toString(file.getSize())); } else { message.setBody(Long.toString(file.getSize())); } } private Dimensions getImageDimensions(File file) { BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; BitmapFactory.decodeFile(file.getAbsolutePath(), options); int rotation = getRotation(file); boolean rotated = rotation == 90 || rotation == 270; int imageHeight = rotated ? options.outWidth : options.outHeight; int imageWidth = rotated ? options.outHeight : options.outWidth; return new Dimensions(imageHeight, imageWidth); } private Dimensions getVideoDimensions(File file) throws NotAVideoFile { MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever(); try { metadataRetriever.setDataSource(file.getAbsolutePath()); } catch (Exception e) { throw new NotAVideoFile(); } String hasVideo = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_HAS_VIDEO); if (hasVideo == null) { throw new NotAVideoFile(); } int rotation = extractRotationFromMediaRetriever(metadataRetriever); boolean rotated = rotation == 90 || rotation == 270; int height; try { String h = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT); height = Integer.parseInt(h); } catch (Exception e) { height = -1; } int width; try { String w = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH); width = Integer.parseInt(w); } catch (Exception e) { width = -1; } metadataRetriever.release(); Log.d(Config.LOGTAG,"extracted video dims "+width+"x"+height); return rotated ? new Dimensions(width, height) : new Dimensions(height, width); } private int extractRotationFromMediaRetriever(MediaMetadataRetriever metadataRetriever) { int rotation; if (Build.VERSION.SDK_INT >= 17) { String r = metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_ROTATION); try { rotation = Integer.parseInt(r); } catch (Exception e) { rotation = 0; } } else { rotation = 0; } return rotation; } private class Dimensions { public final int width; public final int height; public Dimensions(int height, int width) { this.width = width; this.height = height; } } private class NotAVideoFile extends Exception { } public class FileCopyException extends Exception { private static final long serialVersionUID = -1010013599132881427L; private int resId; public FileCopyException(int resId) { this.resId = resId; } public int getResId() { return resId; } } public Bitmap getAvatar(String avatar, int size) { if (avatar == null) { return null; } Bitmap bm = cropCenter(getAvatarUri(avatar), size, size); if (bm == null) { return null; } return bm; } public boolean isFileAvailable(Message message) { return getFile(message).exists(); } public static void close(Closeable stream) { if (stream != null) { try { stream.close(); } catch (IOException e) { } } } public static void close(Socket socket) { if (socket != null) { try { socket.close(); } catch (IOException e) { } } } public static boolean weOwnFile(Context context, Uri uri) { if (uri == null || !ContentResolver.SCHEME_FILE.equals(uri.getScheme())) { return false; } else if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) { return fileIsInFilesDir(context, uri); } else { return weOwnFileLollipop(uri); } } /** * This is more than hacky but probably way better than doing nothing * Further 'optimizations' might contain to get the parents of CacheDir and NoBackupDir * and check against those as well */ private static boolean fileIsInFilesDir(Context context, Uri uri) { try { final String haystack = context.getFilesDir().getParentFile().getCanonicalPath(); final String needle = new File(uri.getPath()).getCanonicalPath(); return needle.startsWith(haystack); } catch (IOException e) { return false; } } @TargetApi(Build.VERSION_CODES.LOLLIPOP) private static boolean weOwnFileLollipop(Uri uri) { try { File file = new File(uri.getPath()); FileDescriptor fd = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY).getFileDescriptor(); StructStat st = Os.fstat(fd); return st.st_uid == android.os.Process.myUid(); } catch (FileNotFoundException e) { return false; } catch (Exception e) { return true; } } }