Develop Reference

Fill out field for pdf revision when signing with PDFbox

I am trying to add input to my existing field in a pdf that should be signed at the end. I used the library from swisscom (https://github.com/SwisscomTrustServices/pdfbox-ais-client/blob/8d52c759ade267b0c443fcd6f15bc9635c745d72/src/main/java/com/swisscom/ais/client/impl/PdfDocument.java#L97) with PDFbox (v2.0.24) and added these lines
try {
PDAcroForm acroForm = pdDocument.getDocumentCatalog().getAcroForm();
acroForm.setSignaturesExist(true);
acroForm.setAppendOnly(true);
acroForm.getCOSObject().setDirect(true);
acroForm.getCOSObject().setNeedToBeUpdated(true);
FieldInput[] fields = new FieldInput[1];
COSObject pdfFields = acroForm.getCOSObject().getCOSObject(COSName.FIELDS);
if (pdfFields != null) {
pdfFields.setNeedToBeUpdated(true);
}
fields[0] = new FieldInput("1", "foobar");
for (int i = 0; i < fields.length; i++) {
PDField field = acroForm.getField(fields[0].id);
if (field != null) {
field.setValue(fields[0].value);
Log.info("set field: " + field.getFullyQualifiedName());
}
}
pdDocument.getDocumentCatalog().getCOSObject().setNeedToBeUpdated(true);
} catch (Exception e) {
Log.warn(e);
}
I get the log output that the field was set, but in the final document the field is still empty. Using this answer from PDFBox 2.0 create signature field and save incremental with already signed document was no luck for me, I think I messed up the form handling since pdfFields is null.
Update:
I added the suggestion from Tilman, now the entry gets set with
field.getCOSObject().setNeedToBeUpdated(true);
But when looking at the signature I have no information which fields are filled out:
Is it possible with pdfbox to achieve the same output as AdobeSign like where you can store more detailed information in the revision metadata? I am not able to open the file with itext rups because the pdf gets locked with a password at the end....
And what would be the best way to look the fields when everyone is done (so the fields are not shown as editable fields anymore):
setting a lock like in Adobe
setting some protection after the field was filled

The update flag must be set on the field itself
field.getCOSObject().setNeedToBeUpdated(true);
and on the appearance of the widget of the field
field.getWidgets().get(0).getAppearance().getCOSObject().setNeedToBeUpdated(true);
(this assumes that the field is its own widget and that there is only one)
It might still work if the second code part is missing because Adobe Reader updates the appearance when displaying.

How to retrieve the file name of an image in Parse.com, for an Android app

I am storing small images inside a table. The field called "questionImage" is storing these images.
The table looks as follows:
I have two questions:
How can I retrieve the file name of the image files? For example, the first object in the table above has an image named "5D_C.png". How can I get that name using Java in Aandroid? I am using Eclipse, if that makes any difference.
Is there a way to import these images in a batch? For example, if I didn't have any image fields, I could have made an Excel sheet of my data and exported it as CSV into Parse.com. Is the same workflow achievable with image fields inside a class?

First you have to make a Parse query to obtain for the objects you are interested in. See here
Then, in the callback, you can iterate over these elements to collect the file names. Something like this:
public void done(List<ParseObject> objsList, ParseException e) {
if (e == null) {
Log.d("score", "Retrieved " + objsList.size() + " things");
ArrayList<String> fileNames = new ArrayList<>();
for (ParseObject ob : objsList) {
//This is the important part
String fileName = ob.getParseFile("questionImage").getName();
fileNames.add(fileName);
}
} else {
Log.d("score", "Error: " + e.getMessage());
}
}
Similarily, if you want to obtain the files, you can (in the same interation), get the file and save it
byte[] bitmapdata = ob.getParseFile("questionImage").getData();
Bitmap bm = BitmapFactory.decodeByteArray(bitmapdata, 0, bitmapdata.length);
//Save bitmap in a file
Hope this helps.
UPDATE: not sure if I understood correctly your question. With "import" you mean get the images from parse or upload them to parse. Parse is not designed to make massive operations (batch operations are quite limited).

Replace a placeholder with image in word?

I need to replace the placeholder with image in the word document using Apache POI. I am able to insert the picture in the word document using Apache poi. But i don't know how to replace the placeholder with image. Can anyone please help in this?
I know it will be easy if we do it through docx4j or some other API, i am allowed to use only the Apache poi.

It can be done but I believe you must insert raw XML to accomplish it currently. This linked question "Insert picture in word document" has the basic idea. You can do it using only the libraries that POI requires, not dom4j. If you look at the source for the method on the XWPFRun that adds a picture it too is trying to add raw XML. But if you use that method it renders your doc unreadable when written back to disk. So you have to add the picture to the document using the XWPFDocument level method, which returns a generated ID for the picture. And then add raw XML to the run with that ID in it, as the example link does.
The way we solved the problem was to instead have our users insert a placeholder image into their Word doc file instead of text. We then: add the replacement image to be inserted at the document level, find the run that contains the placeholder image using the size of the image as criteria, then get and replace the XML for that run with the new image's ID swapped in. As long as the placeholder and the replacement image are the same size this works. If you need to adjust the size of the image after replacing, you could manipulate the XML size values in the same manner. I like our solution better because it is less susceptible to changes in the Word doc XML format then inserting your own full XML for the picture. Cheers
InputStream newImageIS = getImageForCorporation(corporationID);
String relationID = run.getParagraph().getDocument().addPictureData(newImageIS, Document.PICTURE_TYPE_GIF);
replaceRunImageData(run, relationID);
private void replaceRunImageData(XWPFRun run, String relationID) {
CTGraphicalObjectData graph = run.getCTR().getDrawingArray(0).getInlineArray(0).getGraphic()
.getGraphicData();
String currentGraphicXML = graph.toString();
String originalID = RegularExpressionUtil.capture("<a:blip r:embed=\"(\\w+)\"", currentGraphicXML);
String newXML = StringUtils.replace(currentGraphicXML, originalID, relationID);
try {
graph.set(XmlToken.Factory.parse(newXML));
} catch (XmlException e) {
throw new RuntimeException(e);
}
replaced = true;
}
We identified the run of the image to replace by search each run's list of embedded pictures which met the below criteria. We tried using the name of the image as the criteria, but we found that if the placeholder image was copied from one Word doc to another Word doc on a different PC, the name was lost.
private boolean isRunForExistingImage(XWPFPicture pic) {
if (pic == null || pic.getCTPicture() == null || pic.getCTPicture().getSpPr() == null
|| pic.getCTPicture().getSpPr().getXfrm() == null
|| pic.getCTPicture().getSpPr().getXfrm().getExt() == null) {
return false;
}
long x = pic.getCTPicture().getSpPr().getXfrm().getExt().getCx();
long y = pic.getCTPicture().getSpPr().getXfrm().getExt().getCy();
return x == 2066925 && y == 590550;
}

Get GPS data from an image Java code

I would like to get the metadata from an image file in my local system using Java code
In the attached image you can see the desired data which i would like to pull from java code.
I wrote the below code and do not seem pull the data mentioned in the "Details" tab. The below code's output is and this is not what I look for.
Started ..
Format name: javax_imageio_jpeg_image_1.0
Format name: javax_imageio_1.0
Please give me your ideas. Thanks
try {
ImageInputStream inStream = ImageIO.createImageInputStream(new File("D:\\codeTest\\arun.jpg"));
Iterator<ImageReader> imgItr = ImageIO.getImageReaders(inStream);
while (imgItr.hasNext()) {
ImageReader reader = imgItr.next();
reader.setInput(inStream, true);
IIOMetadata metadata = reader.getImageMetadata(0);
String[] names = metadata.getMetadataFormatNames();
int length = names.length;
for (int i = 0; i < length; i++) {
System.out.println( "Format name: " + names[ i ] );
}
}
} catch (IOException e) {
e.printStackTrace();
}

There's no easy way to do it with the Java Core API. You'd have to parse the image's metadata tree, and interpret the proper EXIF tags. Instead, you can pick up the required code from an existing library with EXIF-parsing capabilities, and use it in yours. For example, I have used the Image class of javaxt, which provides a very useful method to extract GPS metadata from an image. It is as simple as:
javaxt.io.Image image = new javaxt.io.Image("D:\\codeTest\\arun.jpg");
double[] gps = image.getGPSCoordinate();
Plus, javaxt.io.Image has no external dependencies, so you can just use that particular class if you don't want to add a dependency on the entire library.

I suggest you read the EXIF header of the image and then parse the tags for finding the GPS information. In Java there is a great library (called metadata-extractor) for extracting and parsing the EXIF header. Please see the getting started for this library here.
Once you do the first 2 steps in the tutorial, look for the tags starting with [GPS] ([GPS] GPS Longitude, [GPS] GPS Latitude, ...).

Based on #dan-d answer, here is my code (kotlin)
private fun readGps(file: String): Optional<GeoLocation> {
// Read all metadata from the image
// Read all metadata from the image
val metadata: Metadata = ImageMetadataReader.readMetadata(File(file))
// See whether it has GPS data
val gpsDirectories = metadata.getDirectoriesOfType(
GpsDirectory::class.java)
for (gpsDirectory in gpsDirectories) {
// Try to read out the location, making sure it's non-zero
val geoLocation = gpsDirectory.geoLocation
if (geoLocation != null && !geoLocation.isZero) {
return Optional.of(geoLocation)
}
}
return Optional.empty()
}

Google App Engine - Data being stored in a weird way

I'm using Java. This is the pure data that gets inserted in the datastore:
<p>Something</p>\n<p>That</p>\n<p> </p>\n<p>Should.</p>\n<p> </p>\n
<p>I have an interesting question.</p>\n<p>Why are you like this?</p>\n
<p> </p>\n<p>Aren't you fine?</p>
This is how it gets stored:
<p>Something</p> <p>That</p> <p>�</p> <p>Should.</p> <p>�</p>
<p>I have an interesting question.</p> <p>Why are you like this?</p>
<p>�</p> <p>Aren't you fine?</p>
What's up with the weird symbols? This happens only live, not on my local dev_appserver.
EDIT
Here's the code that inserts the data:
String content = ""; // this is where the data is stored
try {
ServletFileUpload upload = new ServletFileUpload();
FileItemIterator iter = upload.getItemIterator(request);
while(iter.hasNext()) {
FileItemStream item = iter.next();
InputStream stream = item.openStream();
if(item.isFormField()) {
String fieldName = item.getFieldName();
String fieldValue = new String(IOUtils.toByteArray(stream), "utf-8");
LOG.info("Got a form field: " +fieldName+" with value: "+fieldValue);
// assigning the value
if(fieldName.equals("content")) content = fieldValue;
} else {
...
}
}
} catch (FileUploadException e){
}
...
// insert it in datastore
Recipe recipe = new Recipe(user.getKey(), title, new Text(content), new Text(ingredients), tagsAsStrings);
pm.makePersistent(recipe);
It's a multipart/form-data form so I have to do that little item.isFormField() magic to get the actual content, and construct a String. Maybe that's causing the weird encoding issue? Not sure.
To retrieve the data I simply do:
<%=recipe.getContent().getValue()%>
Since content is of type Text (app engine type) I use the .getValue() to get the actual result. I don't think it's an issue with retrieving the data, since I can see the weird characters directly in the online app-engine datastore viewer.

Are you using eclipse ? if yes check under File > Properties > Text File encoding that your file is UTF-8 encoding.
I would guess not.
So, change it to UTF-8 and your issue should get fixed.
regards
didier

Followed this page to create a Servlet Filter so that all my pages were being encoded in utf8:
How to get UTF-8 working in Java webapps?
After creating the filter, everything works!