* It is also possible to change the field values and to
* flatten them. New fields can be added but not flattened.
* @author Paulo Soares (psoares@consiste.pt)
*/
public class PdfStamper {
/**
* The writer
*/
protected PdfStamperImp stamper;
private HashMap moreInfo;
private boolean hasSignature;
private PdfSignatureAppearance sigApp;
/** Starts the process of adding extra content to an existing PDF
* document.
* @param reader the original document. It cannot be reused
* @param os the output stream
* @throws DocumentException on error
* @throws IOException on error
*/
public PdfStamper(PdfReader reader, OutputStream os) throws DocumentException, IOException {
stamper = new PdfStamperImp(reader, os, '\0', false);
}
/**
* Starts the process of adding extra content to an existing PDF
* document.
* @param reader the original document. It cannot be reused
* @param os the output stream
* @param pdfVersion the new pdf version or '\0' to keep the same version as the original
* document
* @throws DocumentException on error
* @throws IOException on error
*/
public PdfStamper(PdfReader reader, OutputStream os, char pdfVersion) throws DocumentException, IOException {
stamper = new PdfStamperImp(reader, os, pdfVersion, false);
}
/**
* Starts the process of adding extra content to an existing PDF
* document, possibly as a new revision.
* @param reader the original document. It cannot be reused
* @param os the output stream
* @param pdfVersion the new pdf version or '\0' to keep the same version as the original
* document
* @param append if true appends the document changes as a new revision. This is
* only useful for multiple signatures as nothing is gained in speed or memory
* @throws DocumentException on error
* @throws IOException on error
*/
public PdfStamper(PdfReader reader, OutputStream os, char pdfVersion, boolean append) throws DocumentException, IOException {
stamper = new PdfStamperImp(reader, os, pdfVersion, append);
}
/** Gets the optional String map to add or change values in
* the info dictionary.
* @return the map or null
*
*/
public HashMap getMoreInfo() {
return this.moreInfo;
}
/** An optional String map to add or change values in
* the info dictionary. Entries with null
* values delete the key in the original info dictionary
* @param moreInfo additional entries to the info dictionary
*
*/
public void setMoreInfo(HashMap moreInfo) {
this.moreInfo = moreInfo;
}
/**
* Inserts a blank page. All the pages above and including pageNumber will
* be shifted up. If pageNumber is bigger than the total number of pages
* the new page will be the last one.
* @param pageNumber the page number position where the new page will be inserted
* @param mediabox the size of the new page
*/
public void insertPage(int pageNumber, Rectangle mediabox) {
stamper.insertPage(pageNumber, mediabox);
}
/**
* Gets the signing instance. The appearances and other parameters can the be set.
* @return the signing instance
*/
public PdfSignatureAppearance getSignatureAppearance() {
return sigApp;
}
private String getNewSigName() {
AcroFields af = getAcroFields();
String name = "Signature";
int step = 0;
boolean found = false;
while (!found) {
++step;
String n1 = name + step;
if (af.getFieldItem(n1) != null)
continue;
n1 += ".";
found = true;
for (Iterator it = af.getFields().keySet().iterator(); it.hasNext();) {
String fn = (String)it.next();
if (fn.startsWith(n1)) {
found = false;
break;
}
}
}
name += step;
return name;
}
/**
* Closes the document. No more content can be written after the
* document is closed.
*
* If closing a signed document with an external signature the closing must be done
* in the PdfSignatureAppearance instance.
* @throws DocumentException on error
* @throws IOException on error
*/
public void close() throws DocumentException, IOException {
if (!hasSignature) {
stamper.close(moreInfo);
return;
}
sigApp.preClose();
PdfSigGenericPKCS sig = sigApp.getSigStandard();
PdfLiteral lit = (PdfLiteral)sig.get(PdfName.CONTENTS);
int totalBuf = (lit.getPosLength() - 2) / 2;
byte buf[] = new byte[8192];
int n;
InputStream inp = sigApp.getRangeStream();
try {
while ((n = inp.read(buf)) > 0) {
sig.getSigner().update(buf, 0, n);
}
}
catch (SignatureException se) {
throw new ExceptionConverter(se);
}
buf = new byte[totalBuf];
byte[] bsig = sig.getSignerContents();
System.arraycopy(bsig, 0, buf, 0, bsig.length);
PdfString str = new PdfString(buf);
str.setHexWriting(true);
PdfDictionary dic = new PdfDictionary();
dic.put(PdfName.CONTENTS, str);
sigApp.close(dic);
stamper.reader.close();
}
private static int indexArray(byte bout[], int position, String search) {
byte ss[] = PdfEncodings.convertToBytes(search, null);
while (true) {
int k;
for (k = 0; k < ss.length; ++k) {
if (ss[k] != bout[position + k])
break;
}
if (k == ss.length)
return position;
++position;
}
}
private static int indexFile(RandomAccessFile raf, int position, String search) throws IOException {
byte ss[] = PdfEncodings.convertToBytes(search, null);
while (true) {
raf.seek(position);
int k;
for (k = 0; k < ss.length; ++k) {
int b = raf.read();
if (b < 0)
throw new EOFException("Unexpected EOF");
if (ss[k] != (byte)b)
break;
}
if (k == ss.length)
return position;
++position;
}
}
/** Gets a PdfContentByte to write under the page of
* the original document.
* @param pageNum the page number where the extra content is written
* @return a PdfContentByte to write under the page of
* the original document
*/
public PdfContentByte getUnderContent(int pageNum) {
return stamper.getUnderContent(pageNum);
}
/** Gets a PdfContentByte to write over the page of
* the original document.
* @param pageNum the page number where the extra content is written
* @return a PdfContentByte to write over the page of
* the original document
*/
public PdfContentByte getOverContent(int pageNum) {
return stamper.getOverContent(pageNum);
}
/** Checks if the content is automatically adjusted to compensate
* the original page rotation.
* @return the auto-rotation status
*/
public boolean isRotateContents() {
return stamper.isRotateContents();
}
/** Flags the content to be automatically adjusted to compensate
* the original page rotation. The default is true.
* @param rotateContents true to set auto-rotation, false
* otherwise
*/
public void setRotateContents(boolean rotateContents) {
stamper.setRotateContents(rotateContents);
}
/** Sets the encryption options for this document. The userPassword and the
* ownerPassword can be null or have zero length. In this case the ownerPassword
* is replaced by a random string. The open permissions for the document can be
* AllowPrinting, AllowModifyContents, AllowCopy, AllowModifyAnnotations,
* AllowFillIn, AllowScreenReaders, AllowAssembly and AllowDegradedPrinting.
* The permissions can be combined by ORing them.
* @param userPassword the user password. Can be null or empty
* @param ownerPassword the owner password. Can be null or empty
* @param permissions the user permissions
* @param strength128Bits true for 128 bit key length, false for 40 bit key length
* @throws DocumentException if anything was already written to the output
*/
public void setEncryption(byte userPassword[], byte ownerPassword[], int permissions, boolean strength128Bits) throws DocumentException {
if (stamper.isAppend())
throw new DocumentException("Append mode does not support changing the encryption status.");
if (stamper.isContentWritten())
throw new DocumentException("Content was already written to the output.");
stamper.setEncryption(userPassword, ownerPassword, permissions, strength128Bits);
}
/**
* Sets the encryption options for this document. The userPassword and the
* ownerPassword can be null or have zero length. In this case the ownerPassword
* is replaced by a random string. The open permissions for the document can be
* AllowPrinting, AllowModifyContents, AllowCopy, AllowModifyAnnotations,
* AllowFillIn, AllowScreenReaders, AllowAssembly and AllowDegradedPrinting.
* The permissions can be combined by ORing them.
* @param strength true for 128 bit key length, false for 40 bit key length
* @param userPassword the user password. Can be null or empty
* @param ownerPassword the owner password. Can be null or empty
* @param permissions the user permissions
* @throws DocumentException if anything was already written to the output
*/
public void setEncryption(boolean strength, String userPassword, String ownerPassword, int permissions) throws DocumentException {
setEncryption(DocWriter.getISOBytes(userPassword), DocWriter.getISOBytes(ownerPassword), permissions, strength);
}
/** Gets a page from other PDF document. Note that calling this method more than
* once with the same parameters will retrieve the same object.
* @param reader the PDF document where the page is
* @param pageNumber the page number. The first page is 1
* @return the template representing the imported page
*/
public PdfImportedPage getImportedPage(PdfReader reader, int pageNumber) {
return stamper.getImportedPage(reader, pageNumber);
}
/** Gets the underlying PdfWriter.
* @return the underlying PdfWriter
*/
public PdfWriter getWriter() {
return stamper;
}
/** Gets the underlying PdfReader.
* @return the underlying PdfReader
*/
public PdfReader getReader() {
return stamper.reader;
}
/** Gets the AcroFields object that allows to get and set field values
* and to merge FDF forms.
* @return the AcroFields object
*/
public AcroFields getAcroFields() {
return stamper.getAcroFields();
}
/** Determines if the fields are flattened on close. The fields added with
* {@link #addAnnotation(PdfAnnotation,int)} will never be flattened.
* @param flat true to flatten the fields, false
* to keep the fields
*/
public void setFormFlattening(boolean flat) {
stamper.setFormFlattening(flat);
}
/** Determines if the FreeText annotations are flattened on close.
* @param flat true to flatten the FreeText annotations, false
* (the default) to keep the FreeText annotations as active content.
*/
public void setFreeTextFlattening(boolean flat) {
stamper.setFreeTextFlattening(flat);
}
/**
* Adds an annotation of form field in a specific page. This page number
* can be overridden with {@link PdfAnnotation#setPlaceInPage(int)}.
* @param annot the annotation
* @param page the page
*/
public void addAnnotation(PdfAnnotation annot, int page) {
stamper.addAnnotation(annot, page);
}
/**
* Adds the comments present in an FDF file.
* @param fdf the FDF file
* @throws IOException on error
*/
public void addComments(FdfReader fdf) throws IOException {
stamper.addComments(fdf);
}
/**
* Sets the bookmarks. The list structure is defined in
* {@link SimpleBookmark}.
* @param outlines the bookmarks or null to remove any
* @throws IOException on error
*/
public void setOutlines(List outlines) throws IOException {
stamper.setOutlines(outlines);
}
/**
* Sets the thumbnail image for a page.
* @param image the image
* @param page the page
* @throws PdfException on error
* @throws DocumentException on error
*/
public void setThumbnail(Image image, int page) throws PdfException, DocumentException {
stamper.setThumbnail(image, page);
}
/**
* Adds name to the list of fields that will be flattened on close,
* all the other fields will remain. If this method is never called or is called
* with invalid field names, all the fields will be flattened.
*
* Calling setFormFlattening(true) is needed to have any kind of
* flattening.
* @param name the field name
* @return true if the field exists, false otherwise
*/
public boolean partialFormFlattening(String name) {
return stamper.partialFormFlattening(name);
}
/** Adds a JavaScript action at the document level. When the document
* opens all this JavaScript runs. The existing JavaScript will be replaced.
* @param js the JavaScript code
*/
public void addJavaScript(String js) {
stamper.addJavaScript(js, !PdfEncodings.isPdfDocEncoding(js));
}
/** Adds a file attachment at the document level. Existing attachments will be kept.
* @param description the file description
* @param fileStore an array with the file. If it's null
* the file will be read from the disk
* @param file the path to the file. It will only be used if
* fileStore is not null
* @param fileDisplay the actual file name stored in the pdf
* @throws IOException on error
*/
public void addFileAttachment(String description, byte fileStore[], String file, String fileDisplay) throws IOException {
addFileAttachment(description, PdfFileSpecification.fileEmbedded(stamper, file, fileDisplay, fileStore));
}
/** Adds a file attachment at the document level. Existing attachments will be kept.
* @param description the file description
* @param fs the file specification
*/
public void addFileAttachment(String description, PdfFileSpecification fs) throws IOException {
stamper.addFileAttachment(description, fs);
}
/**
* Sets the viewer preferences.
* @param preferences the viewer preferences
* @see PdfWriter#setViewerPreferences(int)
*/
public void setViewerPreferences(int preferences) {
stamper.setViewerPreferences(preferences);
}
/**
* Sets the XMP metadata.
* @param xmp
* @see PdfWriter#setXmpMetadata(byte[])
*/
public void setXmpMetadata(byte[] xmp) {
stamper.setXmpMetadata(xmp);
}
/**
* Gets the 1.5 compression status.
* @return true if the 1.5 compression is on
*/
public boolean isFullCompression() {
return stamper.isFullCompression();
}
/**
* Sets the document's compression to the new 1.5 mode with object streams and xref
* streams. It can be set at any time but once set it can't be unset.
*/
public void setFullCompression() {
if (stamper.isAppend())
return;
stamper.setFullCompression();
}
/**
* Sets the open and close page additional action.
* @param actionType the action type. It can be PdfWriter.PAGE_OPEN
* or PdfWriter.PAGE_CLOSE
* @param action the action to perform
* @param page the page where the action will be applied. The first page is 1
* @throws PdfException if the action type is invalid
*/
public void setPageAction(PdfName actionType, PdfAction action, int page) throws PdfException {
stamper.setPageAction(actionType, action, page);
}
/**
* Sets the display duration for the page (for presentations)
* @param seconds the number of seconds to display the page. A negative value removes the entry
* @param page the page where the duration will be applied. The first page is 1
*/
public void setDuration(int seconds, int page) {
stamper.setDuration(seconds, page);
}
/**
* Sets the transition for the page
* @param transition the transition object. A null removes the transition
* @param page the page where the transition will be applied. The first page is 1
*/
public void setTransition(PdfTransition transition, int page) {
stamper.setTransition(transition, page);
}
/**
* Applies a digital signature to a document, possibly as a new revision, making
* possible multiple signatures. The returned PdfStamper
* can be used normally as the signature is only applied when closing.
*
* A possible use for adding a signature without invalidating an existing one is: *
*
* KeyStore ks = KeyStore.getInstance("pkcs12");
* ks.load(new FileInputStream("my_private_key.pfx"), "my_password".toCharArray());
* String alias = (String)ks.aliases().nextElement();
* PrivateKey key = (PrivateKey)ks.getKey(alias, "my_password".toCharArray());
* Certificate[] chain = ks.getCertificateChain(alias);
* PdfReader reader = new PdfReader("original.pdf");
* FileOutputStream fout = new FileOutputStream("signed.pdf");
* PdfStamper stp = PdfStamper.createSignature(reader, fout, '\0', new
* File("/temp"), true);
* PdfSignatureAppearance sap = stp.getSignatureAppearance();
* sap.setCrypto(key, chain, null, PdfSignatureAppearance.WINCER_SIGNED);
* sap.setReason("I'm the author");
* sap.setLocation("Lisbon");
* // comment next line to have an invisible signature
* sap.setVisibleSignature(new Rectangle(100, 100, 200, 200), 1, null);
* stp.close();
*
* @param reader the original document
* @param os the output stream or null to keep the document in the temporary file
* @param pdfVersion the new pdf version or '\0' to keep the same version as the original
* document
* @param tempFile location of the temporary file. If it's a directory a temporary file will be created there.
* If it's a file it will be used directly. The file will be deleted on exit unless os is null.
* In that case the document can be retrieved directly from the temporary file. If it's null
* no temporary file will be created and memory will be used
* @param append if true the signature and all the other content will be added as a
* new revision thus not invalidating existing signatures
* @return a PdfStamper
* @throws DocumentException on error
* @throws IOException on error
*/
public static PdfStamper createSignature(PdfReader reader, OutputStream os, char pdfVersion, File tempFile, boolean append) throws DocumentException, IOException {
PdfStamper stp;
if (tempFile == null) {
ByteBuffer bout = new ByteBuffer();
stp = new PdfStamper(reader, bout, pdfVersion, append);
stp.sigApp = new PdfSignatureAppearance(stp.stamper);
stp.sigApp.setSigout(bout);
}
else {
if (tempFile.isDirectory())
tempFile = File.createTempFile("pdf", null, tempFile);
FileOutputStream fout = new FileOutputStream(tempFile);
stp = new PdfStamper(reader, fout, pdfVersion, append);
stp.sigApp = new PdfSignatureAppearance(stp.stamper);
stp.sigApp.setTempFile(tempFile);
}
stp.sigApp.setOriginalout(os);
stp.sigApp.setStamper(stp);
stp.hasSignature = true;
return stp;
}
/**
* Applies a digital signature to a document. The returned PdfStamper
* can be used normally as the signature is only applied when closing.
* * Note that the pdf is created in memory. *
* A possible use is: *
*
* KeyStore ks = KeyStore.getInstance("pkcs12");
* ks.load(new FileInputStream("my_private_key.pfx"), "my_password".toCharArray());
* String alias = (String)ks.aliases().nextElement();
* PrivateKey key = (PrivateKey)ks.getKey(alias, "my_password".toCharArray());
* Certificate[] chain = ks.getCertificateChain(alias);
* PdfReader reader = new PdfReader("original.pdf");
* FileOutputStream fout = new FileOutputStream("signed.pdf");
* PdfStamper stp = PdfStamper.createSignature(reader, fout, '\0');
* PdfSignatureAppearance sap = stp.getSignatureAppearance();
* sap.setCrypto(key, chain, null, PdfSignatureAppearance.WINCER_SIGNED);
* sap.setReason("I'm the author");
* sap.setLocation("Lisbon");
* // comment next line to have an invisible signature
* sap.setVisibleSignature(new Rectangle(100, 100, 200, 200), 1, null);
* stp.close();
*
* @param reader the original document
* @param os the output stream
* @param pdfVersion the new pdf version or '\0' to keep the same version as the original
* document
* @throws DocumentException on error
* @throws IOException on error
* @return a PdfStamper
*/
public static PdfStamper createSignature(PdfReader reader, OutputStream os, char pdfVersion) throws DocumentException, IOException {
return createSignature(reader, os, pdfVersion, null, false);
}
/**
* Applies a digital signature to a document. The returned PdfStamper
* can be used normally as the signature is only applied when closing.
* * A possible use is: *
*
* KeyStore ks = KeyStore.getInstance("pkcs12");
* ks.load(new FileInputStream("my_private_key.pfx"), "my_password".toCharArray());
* String alias = (String)ks.aliases().nextElement();
* PrivateKey key = (PrivateKey)ks.getKey(alias, "my_password".toCharArray());
* Certificate[] chain = ks.getCertificateChain(alias);
* PdfReader reader = new PdfReader("original.pdf");
* FileOutputStream fout = new FileOutputStream("signed.pdf");
* PdfStamper stp = PdfStamper.createSignature(reader, fout, '\0', new File("/temp"));
* PdfSignatureAppearance sap = stp.getSignatureAppearance();
* sap.setCrypto(key, chain, null, PdfSignatureAppearance.WINCER_SIGNED);
* sap.setReason("I'm the author");
* sap.setLocation("Lisbon");
* // comment next line to have an invisible signature
* sap.setVisibleSignature(new Rectangle(100, 100, 200, 200), 1, null);
* stp.close();
*
* @param reader the original document
* @param os the output stream or null to keep the document in the temporary file
* @param pdfVersion the new pdf version or '\0' to keep the same version as the original
* document
* @param tempFile location of the temporary file. If it's a directory a temporary file will be created there.
* If it's a file it will be used directly. The file will be deleted on exit unless os is null.
* In that case the document can be retrieved directly from the temporary file. If it's null
* no temporary file will be created and memory will be used
* @return a PdfStamper
* @throws DocumentException on error
* @throws IOException on error
*/
public static PdfStamper createSignature(PdfReader reader, OutputStream os, char pdfVersion, File tempFile) throws DocumentException, IOException
{
return createSignature(reader, os, pdfVersion, tempFile, false);
}
}