public static void Sign(string input, string output, ImageData stamper, ICipherParameters privateKey, X509Certificate[] chain, string flag)
{
PdfDocument document = new PdfDocument(new PdfReader(input));
PdfAcroForm acroForm = PdfAcroForm.GetAcroForm(document, false);
bool append = (acroForm != null && acroForm.GetSignatureFlags() != 0);
int pageNumber = document.GetNumberOfPages();
RegexBasedLocationExtractionStrategy strategy = new RegexBasedLocationExtractionStrategy(flag);
PdfDocumentContentParser parser = new PdfDocumentContentParser(document);
parser.ProcessContent(pageNumber, strategy);
var locations = new List <IPdfTextLocation>(strategy.GetResultantLocations());
document.Close();
StampingProperties properties = new StampingProperties();
properties = append ? properties.UseAppendMode() : properties;
PdfSigner signer = new PdfSigner(new PdfReader(input), new FileStream(output, FileMode.Create), properties);
signer.SetCertificationLevel(PdfSigner.CERTIFIED_NO_CHANGES_ALLOWED);
PdfSignatureAppearance appearance = signer.GetSignatureAppearance();
appearance.SetPageNumber(pageNumber);
int size = locations.Count;
if (size != 0)
{
IPdfTextLocation location = locations[size - 1];
float flagX = location.GetRectangle().GetX();
float flagY = location.GetRectangle().GetY();
float width = stamper.GetWidth();
float height = stamper.GetHeight();
float x = flagX - width / 2;
float y = flagY - height / 2;
appearance.SetRenderingMode(PdfSignatureAppearance.RenderingMode.GRAPHIC);
appearance.SetSignatureGraphic(stamper);
appearance.SetPageRect(new Rectangle(x, y, width, height));
}
PrivateKeySignature signature = new PrivateKeySignature(privateKey, DigestAlgorithms.SHA256);
signer.SignDetached(signature, chain, null, null, null, 0, PdfSigner.CryptoStandard.CADES);
}
/// <summary>
/// Get all
/// <see cref="iText.PdfCleanup.PdfCleanUpLocation"/>
/// objects from a given
/// <see cref="iText.Kernel.Pdf.PdfDocument"/>
/// </summary>
/// <param name="doc">
/// the
/// <see cref="iText.Kernel.Pdf.PdfDocument"/>
/// to be processed
/// </param>
/// <returns>
/// a List of
/// <see cref="iText.PdfCleanup.PdfCleanUpLocation"/>
/// objects
/// </returns>
public virtual IList <PdfCleanUpLocation> GetPdfCleanUpLocations(PdfDocument doc)
{
PdfDocumentContentParser parser = new PdfDocumentContentParser(doc);
IList <PdfCleanUpLocation> toClean = new List <PdfCleanUpLocation>();
for (int pageNr = 1; pageNr <= doc.GetNumberOfPages(); pageNr++)
{
parser.ProcessContent(pageNr, strategy);
foreach (IPdfTextLocation rect in strategy.GetResultantLocations())
{
if (rect != null)
{
toClean.Add(new PdfCleanUpLocation(pageNr, rect.GetRectangle(), strategy.GetRedactionColor(rect)));
}
}
ResetStrategy();
}
JavaCollectionsUtil.Sort(toClean, new _IComparer_137());
return(toClean);
}
/// <summary>
/// Get all
/// <see cref="iText.PdfCleanup.PdfCleanUpLocation"/>
/// objects from a given
/// <see cref="iText.Kernel.Pdf.PdfPage"/>
/// </summary>
/// <param name="page">
/// the
/// <see cref="iText.Kernel.Pdf.PdfPage"/>
/// to be processed
/// </param>
/// <returns>
/// a List of
/// <see cref="iText.PdfCleanup.PdfCleanUpLocation"/>
/// objects
/// </returns>
public virtual IList <PdfCleanUpLocation> GetPdfCleanUpLocations(PdfPage page)
{
// get document
PdfDocument doc = page.GetDocument();
// create parser
PdfDocumentContentParser parser = new PdfDocumentContentParser(doc);
// get page number
int pageNr = doc.GetPageNumber(page);
// process document
IList <PdfCleanUpLocation> toClean = new List <PdfCleanUpLocation>();
parser.ProcessContent(pageNr, strategy);
foreach (IPdfTextLocation rect in strategy.GetResultantLocations())
{
if (rect != null)
{
toClean.Add(new PdfCleanUpLocation(pageNr, rect.GetRectangle(), strategy.GetRedactionColor(rect)));
}
}
// reset strategy for next iteration
ResetStrategy();
// return
return(toClean);
}
//
// Helper methods
//
private void Merge(PdfDocument from, int pageNum)
{
PdfPage page = from.GetPage(pageNum);
Rectangle currentPageRect = page.GetPageSize();
if (!(pageSize.GetHeight() == currentPageRect.GetHeight()) ||
!(pageSize.GetWidth() == currentPageRect.GetWidth()))
{
throw new PdfException("Page size of the copied page should be the same as "
+ "the page size of the resultant document.");
}
PdfFormXObject formXObject = page.CopyAsFormXObject(pdfDocument);
PdfDocumentContentParser contentParser = new PdfDocumentContentParser(from);
PageVerticalAnalyzer finder = contentParser.ProcessContent(pageNum, new PageVerticalAnalyzer());
List <float> verticalFlips = finder.GetVerticalFlips();
if (verticalFlips.Count < 2)
{
return;
}
Rectangle pageSizeToImport = page.GetPageSize();
int startFlip = verticalFlips.Count - 1;
bool first = true;
while (startFlip > 0)
{
if (!first)
{
NewPage();
}
float freeSpace = yPosition - (pageSize.GetBottom() + bottom);
int endFlip = startFlip + 1;
while ((endFlip > 1) && (verticalFlips[startFlip] - verticalFlips[endFlip - 2] < freeSpace))
{
endFlip -= 2;
}
if (endFlip < startFlip)
{
float height = verticalFlips[startFlip] - verticalFlips[endFlip];
canvas.SaveState();
canvas.Rectangle(0, yPosition - height, pageSizeToImport.GetWidth(), height);
canvas.Clip();
canvas.EndPath();
canvas.AddXObjectAt(formXObject, 0,
yPosition - (verticalFlips[startFlip] - pageSizeToImport.GetBottom()));
canvas.RestoreState();
yPosition -= height + gap;
startFlip = endFlip - 1;
}
else if (!first)
{
throw new ArgumentException(String.Format("Page {0} content sections too large.", page));
}
first = false;
}
}
