/// <summary>
/// Adds a watermark on all pages of the specified document.
/// </summary>
/// <param name="doc">Document to process.</param>
/// <param name="imageDataStream">Stream containing image data to be used as watermark. Caller is reposible for closing it.</param>
/// <param name="outputStream">Output stream, optional. If not set, incremental save will be performed. Caller is responsible for closing it.</param>
public static void Watermark(this FixedDocument doc, Stream imageDataStream, Stream outputStream = null)
{
if (doc == null)
{
throw new ArgumentNullException(nameof(doc));
}
if (imageDataStream == null)
{
throw new ArgumentNullException(nameof(imageDataStream));
}
// create and register image resource
string imageResourceId = Guid.NewGuid().ToString("N");
Image imageResource = new Image(imageResourceId, imageDataStream);
doc.ResourceManager.RegisterResource(imageResource);
// register watermark XObject it will be referenced in all watermark annotations
FixedContent watermarkContent = new FixedContent(Guid.NewGuid().ToString("N"),
new Boundary(imageResource.Width, imageResource.Height));
watermarkContent.Content.AppendImage(imageResourceId, 0, 0, imageResource.Width, imageResource.Height);
doc.ResourceManager.RegisterResource(watermarkContent);
// add annotations to every page
foreach (Page page in doc.Pages)
{
WatermarkAnnotation watermarkAnnotation = CreateWatermarkAnnotation(page.Boundary.MediaBox, watermarkContent);
doc.ResourceManager.RegisterResource(watermarkAnnotation.Watermark);
page.Annotations.Add(watermarkAnnotation);
}
// save to specified file or do an incremental update
if (outputStream != null)
{
doc.Save(outputStream);
}
else
{
doc.Save();
}
}
/// <summary>
/// Signs the range of document pages using given certificate and signature image.
/// </summary>
/// <param name="doc">Document to sign.</param>
/// <param name="signingCertificate">Signing certificate's data stream.</param>
/// <param name="certPassword">Certificate's password.</param>
/// <param name="signatureImage">Image stream that will represent the signature visually on page.</param>
/// <param name="signatureBoundary">Visual signature boundaries.</param>
/// <param name="signaturePageIndexStart">The index of the first page to sign.</param>
/// <param name="signaturePageIndexEnd">The index of the last page to sign.</param>
/// <param name="outputStream">Output stream, optional. If not set, incremental save will be performed.</param>
/// <returns>Identifier assigned to the created signature field. Using this id you can find this field in doc's AcroForm dictionary.</returns>
public static string Sign(this FixedDocument doc, Stream signingCertificate,
string certPassword, Stream signatureImage, Boundary signatureBoundary,
int signaturePageIndexStart = 0, int signaturePageIndexEnd = 0, Stream outputStream = null)
{
if (doc == null)
{
throw new ArgumentNullException(nameof(doc));
}
if (signingCertificate == null)
{
throw new ArgumentNullException(nameof(signingCertificate));
}
if (certPassword == null)
{
throw new ArgumentNullException(nameof(certPassword));
}
if (signatureImage == null)
{
throw new ArgumentNullException(nameof(signatureImage));
}
if (signatureBoundary == null)
{
throw new ArgumentNullException(nameof(signatureBoundary));
}
if (signaturePageIndexStart < 0 || signaturePageIndexStart > doc.Pages.Count - 1)
{
throw new ArgumentOutOfRangeException(nameof(signaturePageIndexStart));
}
if (signaturePageIndexEnd < signaturePageIndexStart || signaturePageIndexEnd > doc.Pages.Count - 1)
{
throw new ArgumentOutOfRangeException(nameof(signaturePageIndexEnd));
}
string imageId = Guid.NewGuid().ToString("N");
string signatureFieldId = Guid.NewGuid().ToString("N");
// register signature image resource
doc.ResourceManager.RegisterResource(new Image(imageId, signatureImage));
// create signature field and initialize it using a stored
// password protected certificate
SignatureField signatureField = new SignatureField(signatureFieldId);
signatureField.Signature = Signature.Create(new Pkcs12Store(signingCertificate, certPassword));
// add signature field to a document
doc.AcroForm.Fields.Add(signatureField);
// create signature view using the image resource
SignatureFieldView signatureView = new SignatureFieldView(signatureField, signatureBoundary);
signatureView.ViewSettings.Graphic = Graphic.Image;
signatureView.ViewSettings.GraphicResourceID = imageId;
signatureView.ViewSettings.Description = Description.None;
// add view to pages' annotations
for (int i = signaturePageIndexStart; i <= signaturePageIndexEnd; ++i)
{
doc.Pages[i].Annotations.Add(signatureView);
}
// save to specified file or do an incremental update
if (outputStream != null)
{
doc.Save(outputStream);
}
else
{
doc.Save();
}
return(signatureFieldId);
}
/// <summary>
/// Adds a watermark to all pages of the specified document.
/// </summary>
/// <param name="doc">Document to process.</param>
/// <param name="watermarkText">Watermark text.</param>
/// <param name="outputStream">Output stream, optional. If not set, incremental save will be performed.</param>
public static void WatermarkText(this FixedDocument doc, string watermarkText, Stream outputStream = null)
{
if (doc == null)
{
throw new ArgumentNullException(nameof(doc));
}
if (string.IsNullOrEmpty(watermarkText))
{
throw new ArgumentException("Value cannot be null or empty.", nameof(watermarkText));
}
// register graphics state that sets transparency level for content
GraphicsState gsTransparency = new GraphicsState("gsTransparency");
gsTransparency.CurrentNonStrokingAlpha = 0.3;
gsTransparency.CurrentStrokingAlpha = 0.3;
doc.ResourceManager.RegisterResource(gsTransparency);
// create watermark content template using given text
double fontSizeInPoints = 20;
double padding = 10;
double borderThickness = 2;
double totalAddedSpace = (padding + borderThickness) * 2;
TextBlock watermarkTextBlock = new TextBlock(watermarkText)
{
Font = new Font("Times New Roman", fontSizeInPoints),
Color = RgbColors.Red,
Padding = new Thickness(padding),
BorderColor = RgbColors.Red,
Border = new Border(borderThickness),
BorderRadius = 5,
Background = RgbColors.Pink
};
double textBlockWidth = watermarkTextBlock.Measure(doc.ResourceManager) + totalAddedSpace;
double textBlockHeight = fontSizeInPoints + totalAddedSpace + 10;
FixedContent watermarkContent = new FixedContent(Guid.NewGuid().ToString("N"), new Boundary(textBlockWidth, textBlockHeight));
watermarkContent.Content.SetGraphicsState(gsTransparency.ID);
watermarkContent.Content.AppendContentElement(watermarkTextBlock, textBlockWidth, textBlockHeight);
// register watermark XObject it will be referenced in all watermark annotations
doc.ResourceManager.RegisterResource(watermarkContent);
// add annotations to every page
foreach (Page page in doc.Pages)
{
WatermarkAnnotation watermarkAnnotation = CreateWatermarkAnnotation(page.Boundary.MediaBox, watermarkContent, true);
doc.ResourceManager.RegisterResource(watermarkAnnotation.Watermark);
page.Annotations.Add(watermarkAnnotation);
}
// save to specified file or do an incremental update
if (outputStream != null)
{
doc.Save(outputStream);
}
else
{
doc.Save();
}
}
/// <summary>
/// Signs the range of document pages using given certificate and signature image.
/// </summary>
/// <param name="doc">Document to sign.</param>
/// <param name="signingCertificate">Signing certificate's data stream.</param>
/// <param name="certPassword">Certificate's password.</param>
/// <param name="signatureText">The text of the signature.</param>
/// <param name="signatureBoundary">Visual signature boundaries.</param>
/// <param name="signaturePageIndexStart">The index of the first page to sign.</param>
/// <param name="signaturePageIndexEnd">The index of the last page to sign.</param>
/// <param name="outputStream">Output stream, optional. If not set, incremental save will be performed.</param>
/// <returns>Identifier assigned to the created signature field. Using this id you can find this field in doc's AcroForm dictionary.</returns>
public static string Sign(this FixedDocument doc, Stream signingCertificate,
string certPassword, string signatureText, Boundary signatureBoundary,
int signaturePageIndexStart = 0, int signaturePageIndexEnd = 0, Stream outputStream = null)
{
if (doc == null)
{
throw new ArgumentNullException(nameof(doc));
}
if (signingCertificate == null)
{
throw new ArgumentNullException(nameof(signingCertificate));
}
if (certPassword == null)
{
throw new ArgumentNullException(nameof(certPassword));
}
if (signatureBoundary == null)
{
throw new ArgumentNullException(nameof(signatureBoundary));
}
if (signaturePageIndexStart < 0 || signaturePageIndexStart > doc.Pages.Count - 1)
{
throw new ArgumentOutOfRangeException(nameof(signaturePageIndexStart));
}
if (signaturePageIndexEnd < signaturePageIndexStart || signaturePageIndexEnd > doc.Pages.Count - 1)
{
throw new ArgumentOutOfRangeException(nameof(signaturePageIndexEnd));
}
// create textual resource
FixedContent signatureTextXObject = new FixedContent(Guid.NewGuid().ToString("N"), new Boundary(0, 0, signatureBoundary.Width, signatureBoundary.Height));
Section section = new Section();
if (!string.IsNullOrEmpty(signatureText))
{
var newLineString = "<br/>";
signatureText = signatureText.Replace("\r\n", newLineString)
.Replace("\n", newLineString)
.Replace("\r", newLineString);
foreach (ContentElement contentElement in ContentElement.FromMarkup(signatureText))
{
contentElement.Font = new Font("TimesNewRoman", 12);
section.Add(contentElement);
}
signatureTextXObject.Content.AppendContentElement(section, signatureBoundary.Width, signatureBoundary.Height);
}
doc.ResourceManager.RegisterResource(signatureTextXObject);
string signatureFieldId = Guid.NewGuid().ToString("N");
// create signature field and initialize it using a stored
// password protected certificate
SignatureField signatureField = new SignatureField(signatureFieldId);
signatureField.Signature = Signature.Create(new Pkcs12Store(signingCertificate, certPassword));
// add signature field to a document
doc.AcroForm.Fields.Add(signatureField);
// create signature view using the image resource
SignatureFieldView signatureView = new SignatureFieldView(signatureField, signatureBoundary);
signatureView.ViewSettings.Graphic = Graphic.XObject;
signatureView.ViewSettings.GraphicResourceID = signatureTextXObject.ID;
signatureView.ViewSettings.Description = Description.None;
// add view to pages' annotations
for (int i = signaturePageIndexStart; i <= signaturePageIndexEnd; ++i)
{
doc.Pages[i].Annotations.Add(signatureView);
}
// save to specified file or do an incremental update
if (outputStream != null)
{
doc.Save(outputStream);
}
else
{
doc.Save();
}
return(signatureFieldId);
}
