/**
* Returns the mime type for a given attachment. There are three possible results: - If thumbnail
* Uri, always returns "image/png" (even if there's no attachment) - If the attachment does not
* exist, returns null - Returns the mime type of the attachment
*/
@Override
public String getType(Uri uri) {
long callingId = Binder.clearCallingIdentity();
try {
List<String> segments = uri.getPathSegments();
String id = segments.get(1);
int match = sURIMatcher.match(uri);
String format = (match == ATTACHMENTS_CACHED_FILE_ACCESS) ? null : segments.get(2);
if (AttachmentUtilities.FORMAT_THUMBNAIL.equals(format)) {
return "image/png";
} else {
uri =
(match == ATTACHMENTS_CACHED_FILE_ACCESS)
? rebuildUri(uri)
: ContentUris.withAppendedId(Attachment.CONTENT_URI, Long.parseLong(id));
Cursor c =
getContext().getContentResolver().query(uri, MIME_TYPE_PROJECTION, null, null, null);
try {
if (c.moveToFirst()) {
String mimeType = c.getString(MIME_TYPE_COLUMN_MIME_TYPE);
String fileName = c.getString(MIME_TYPE_COLUMN_FILENAME);
mimeType = AttachmentUtilities.inferMimeType(fileName, mimeType);
return mimeType;
}
} finally {
c.close();
}
return null;
}
} finally {
Binder.restoreCallingIdentity(callingId);
}
}
/**
* Open an attachment file. There are two "formats" - "raw", which returns an actual file, and
* "thumbnail", which attempts to generate a thumbnail image.
*
* <p>Thumbnails are cached for easy space recovery and cleanup.
*
* <p>TODO: The thumbnail format returns null for its failure cases, instead of throwing
* FileNotFoundException, and should be fixed for consistency.
*
* @throws FileNotFoundException
*/
@Override
public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {
int match = sURIMatcher.match(uri);
if (match == ATTACHMENTS_CACHED_FILE_ACCESS) {
long callingId = Binder.clearCallingIdentity();
try {
return getContext().getContentResolver().openFileDescriptor(rebuildUri(uri), "r");
} finally {
Binder.restoreCallingIdentity(callingId);
}
}
// If this is a write, the caller must have the EmailProvider permission, which is
// based on signature only
if (mode.equals("w")) {
Context context = getContext();
if (context.checkCallingOrSelfPermission(EmailContent.PROVIDER_PERMISSION)
!= PackageManager.PERMISSION_GRANTED) {
throw new FileNotFoundException();
}
List<String> segments = uri.getPathSegments();
String accountId = segments.get(0);
String id = segments.get(1);
File saveIn = AttachmentUtilities.getAttachmentDirectory(context, Long.parseLong(accountId));
if (!saveIn.exists()) {
saveIn.mkdirs();
}
File newFile = new File(saveIn, id);
return ParcelFileDescriptor.open(
newFile,
ParcelFileDescriptor.MODE_READ_WRITE
| ParcelFileDescriptor.MODE_CREATE
| ParcelFileDescriptor.MODE_TRUNCATE);
}
long callingId = Binder.clearCallingIdentity();
try {
List<String> segments = uri.getPathSegments();
String accountId = segments.get(0);
String id = segments.get(1);
String format = segments.get(2);
if (AttachmentUtilities.FORMAT_THUMBNAIL.equals(format)) {
int width = Integer.parseInt(segments.get(3));
int height = Integer.parseInt(segments.get(4));
String filename = "thmb_" + accountId + "_" + id;
File dir = getContext().getCacheDir();
File file = new File(dir, filename);
if (!file.exists()) {
Uri attachmentUri =
AttachmentUtilities.getAttachmentUri(Long.parseLong(accountId), Long.parseLong(id));
Cursor c = query(attachmentUri, new String[] {Columns.DATA}, null, null, null);
if (c != null) {
try {
if (c.moveToFirst()) {
attachmentUri = Uri.parse(c.getString(0));
} else {
return null;
}
} finally {
c.close();
}
}
String type = getContext().getContentResolver().getType(attachmentUri);
try {
InputStream in = getContext().getContentResolver().openInputStream(attachmentUri);
Bitmap thumbnail = createThumbnail(type, in);
if (thumbnail == null) {
return null;
}
thumbnail = Bitmap.createScaledBitmap(thumbnail, width, height, true);
FileOutputStream out = new FileOutputStream(file);
thumbnail.compress(Bitmap.CompressFormat.PNG, 100, out);
out.close();
in.close();
} catch (IOException ioe) {
LogUtils.d(Logging.LOG_TAG, "openFile/thumbnail failed with " + ioe.getMessage());
return null;
} catch (OutOfMemoryError oome) {
LogUtils.d(Logging.LOG_TAG, "openFile/thumbnail failed with " + oome.getMessage());
return null;
}
}
return ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
} else {
return ParcelFileDescriptor.open(
new File(getContext().getDatabasePath(accountId + ".db_att"), id),
ParcelFileDescriptor.MODE_READ_ONLY);
}
} finally {
Binder.restoreCallingIdentity(callingId);
}
}