|
public PreClose ( int>.Dictionary |
||
| exclusionSizes | int>.Dictionary | |
| Результат | void | |
public void PreClose(Dictionary<PdfName, int> exclusionSizes)
{
if (preClosed)
throw new DocumentException(MessageLocalization.GetComposedMessage("document.already.pre.closed"));
stamper.MergeVerification();
preClosed = true;
AcroFields af = writer.AcroFields;
String name = FieldName;
bool fieldExists = !(IsInvisible() || IsNewField());
PdfIndirectReference refSig = writer.PdfIndirectReference;
writer.SigFlags = 3;
PdfDictionary fieldLock = null;
if (fieldExists) {
PdfDictionary widget = af.GetFieldItem(name).GetWidget(0);
writer.MarkUsed(widget);
fieldLock = widget.GetAsDict(PdfName.LOCK);
widget.Put(PdfName.P, writer.GetPageReference(Page));
widget.Put(PdfName.V, refSig);
PdfObject obj = PdfReader.GetPdfObjectRelease(widget.Get(PdfName.F));
int flags = 0;
if (obj != null && obj.IsNumber())
flags = ((PdfNumber)obj).IntValue;
flags |= PdfAnnotation.FLAGS_LOCKED;
widget.Put(PdfName.F, new PdfNumber(flags));
PdfDictionary ap = new PdfDictionary();
ap.Put(PdfName.N, GetAppearance().IndirectReference);
widget.Put(PdfName.AP, ap);
}
else {
PdfFormField sigField = PdfFormField.CreateSignature(writer);
sigField.FieldName = name;
sigField.Put(PdfName.V, refSig);
sigField.Flags = PdfAnnotation.FLAGS_PRINT | PdfAnnotation.FLAGS_LOCKED;
int pagen = Page;
if (!IsInvisible())
sigField.SetWidget(PageRect, null);
else
sigField.SetWidget(new Rectangle(0, 0), null);
sigField.SetAppearance(PdfAnnotation.APPEARANCE_NORMAL, GetAppearance());
sigField.Page = pagen;
writer.AddAnnotation(sigField, pagen);
}
exclusionLocations = new Dictionary<PdfName,PdfLiteral>();
if (cryptoDictionary == null) {
throw new DocumentException("No crypto dictionary defined.");
}
else {
PdfLiteral lit = new PdfLiteral(80);
exclusionLocations[PdfName.BYTERANGE] = lit;
cryptoDictionary.Put(PdfName.BYTERANGE, lit);
foreach (KeyValuePair<PdfName,int> entry in exclusionSizes) {
PdfName key = entry.Key;
int v = entry.Value;
lit = new PdfLiteral(v);
exclusionLocations[key] = lit;
cryptoDictionary.Put(key, lit);
}
if (certificationLevel > 0)
AddDocMDP(cryptoDictionary);
if (fieldLock != null)
AddFieldMDP(cryptoDictionary, fieldLock);
if (signatureEvent != null)
signatureEvent.GetSignatureDictionary(cryptoDictionary);
writer.AddToBody(cryptoDictionary, refSig, false);
}
if (certificationLevel > 0) {
// add DocMDP entry to root
PdfDictionary docmdp = new PdfDictionary();
docmdp.Put(new PdfName("DocMDP"), refSig);
writer.reader.Catalog.Put(new PdfName("Perms"), docmdp);
}
writer.Close(stamper.MoreInfo);
range = new long[exclusionLocations.Count * 2];
long byteRangePosition = exclusionLocations[PdfName.BYTERANGE].Position;
exclusionLocations.Remove(PdfName.BYTERANGE);
int idx = 1;
foreach (PdfLiteral lit in exclusionLocations.Values) {
long n = lit.Position;
range[idx++] = n;
range[idx++] = lit.PosLength + n;
}
Array.Sort(range, 1, range.Length - 2);
for (int k = 3; k < range.Length - 2; k += 2)
range[k] -= range[k - 1];
if (tempFile == null) {
bout = sigout.Buffer;
boutLen = sigout.Size;
range[range.Length - 1] = boutLen - range[range.Length - 2];
ByteBuffer bf = new ByteBuffer();
bf.Append('[');
for (int k = 0; k < range.Length; ++k)
bf.Append(range[k]).Append(' ');
bf.Append(']');
Array.Copy(bf.Buffer, 0, bout, byteRangePosition, bf.Size);
}
else {
try {
raf = new FileStream(tempFile, FileMode.Open, FileAccess.ReadWrite);
long len = raf.Length;
range[range.Length - 1] = len - range[range.Length - 2];
ByteBuffer bf = new ByteBuffer();
bf.Append('[');
for (int k = 0; k < range.Length; ++k)
bf.Append(range[k]).Append(' ');
bf.Append(']');
raf.Seek(byteRangePosition, SeekOrigin.Begin);
raf.Write(bf.Buffer, 0, bf.Size);
}
catch (IOException e) {
try{raf.Close();}catch{}
try{File.Delete(tempFile);}catch{}
throw e;
}
}
}
/**
* Signs a document with a PAdES-LTV Timestamp. The document is closed at the end.
* @param sap the signature appearance
* @param tsa the timestamp generator
* @param signatureName the signature name or null to have a name generated
* automatically
* @throws Exception
*/
public static void Timestamp(PdfSignatureAppearance sap, ITSAClient tsa, String signatureName) {
int contentEstimated = tsa.GetTokenSizeEstimate();
sap.SetVisibleSignature(new Rectangle(0,0,0,0), 1, signatureName);
PdfSignature dic = new PdfSignature(PdfName.ADOBE_PPKLITE, PdfName.ETSI_RFC3161);
dic.Put(PdfName.TYPE, PdfName.DOCTIMESTAMP);
sap.CryptoDictionary = dic;
Dictionary<PdfName,int> exc = new Dictionary<PdfName,int>();
exc[PdfName.CONTENTS] = contentEstimated * 2 + 2;
sap.PreClose(exc);
Stream data = sap.RangeStream;
IDigest messageDigest = DigestUtilities.GetDigest(tsa.GetDigestAlgorithm());
byte[] buf = new byte[4096];
int n;
while ((n = data.Read(buf, 0, buf.Length)) > 0) {
messageDigest.BlockUpdate(buf, 0, n);
}
byte[] tsImprint = new byte[messageDigest.GetDigestSize()];
messageDigest.DoFinal(tsImprint, 0);
byte[] tsToken = tsa.GetTimeStampToken(tsImprint);
if (contentEstimated + 2 < tsToken.Length)
throw new Exception("Not enough space");
byte[] paddedSig = new byte[contentEstimated];
System.Array.Copy(tsToken, 0, paddedSig, 0, tsToken.Length);
PdfDictionary dic2 = new PdfDictionary();
dic2.Put(PdfName.CONTENTS, new PdfString(paddedSig).SetHexWriting(true));
sap.Close(dic2);
}
