/**
* Creates a serializable blob from a stream, with filename and mimetype detection.
*
* <p>Creates an in-memory blob if data is under 64K, otherwise constructs a serializable FileBlob
* which stores data in a temporary file on the hard disk.
*
* @param file the input stream holding data
* @param filename the file name. Will be set on the blob and will used for mimetype detection.
* @param mimeType the detected mimetype at upload. Can be null. Will be verified by the mimetype
* service.
*/
public static Blob createSerializableBlob(InputStream file, String filename, String mimeType) {
Blob blob = null;
try {
// persisting the blob makes it possible to read the binary content
// of the request stream several times (mimetype sniffing, digest
// computation, core binary storage)
blob = StreamingBlob.createFromStream(file, mimeType).persist();
// filename
if (filename != null) {
filename = getCleanFileName(filename);
}
blob.setFilename(filename);
// mimetype detection
MimetypeRegistry mimeService = Framework.getService(MimetypeRegistry.class);
String detectedMimeType =
mimeService.getMimetypeFromFilenameAndBlobWithDefault(filename, blob, null);
if (detectedMimeType == null) {
if (mimeType != null) {
detectedMimeType = mimeType;
} else {
// default
detectedMimeType = "application/octet-stream";
}
}
blob.setMimeType(detectedMimeType);
} catch (MimetypeDetectionException e) {
log.error(String.format("could not fetch mimetype for file %s", filename), e);
} catch (IOException e) {
log.error(e);
} catch (Exception e) {
log.error(e);
}
return blob;
}
/**
* Creates a TemporaryFileBlob.
*
* <p>Similar to FileUtils.createSerializableBlob.
*
* @since 5.7.2
*/
public static Blob createTemporaryFileBlob(File file, String filename, String mimeType) {
if (filename != null) {
filename = FileUtils.getCleanFileName(filename);
}
Blob blob = new TemporaryFileBlob(file, mimeType, null, filename, null);
try {
// mimetype detection
MimetypeRegistry mimeService = Framework.getLocalService(MimetypeRegistry.class);
String detectedMimeType =
mimeService.getMimetypeFromFilenameAndBlobWithDefault(filename, blob, null);
if (detectedMimeType == null) {
if (mimeType != null) {
detectedMimeType = mimeType;
} else {
// default
detectedMimeType = "application/octet-stream";
}
}
blob.setMimeType(detectedMimeType);
} catch (MimetypeDetectionException e) {
log.error(String.format("could not fetch mimetype for file %s", filename), e);
}
return blob;
}