private byte[] generatePrinterFriendlyVersion(byte[] pdfContent, string verificationCode)
{
// The verification code is generated without hyphens to save storage space and avoid copy-and-paste
// problems. On the PDF generation, we use the "formatted" version, with hyphens (which will later
// be discarded on the verification page).
var formattedVerificationCode = AlphaCode.Format(verificationCode);
// Build the verification link from the constant "VerificationLinkFormat" (see above) and the
// formatted verification code.
var verificationLink = string.Format(VerificationLinkFormat, formattedVerificationCode);
// 1. Inspect signatures on the PDF.
var signature = Lacuna.Pki.Pades.PadesSignature.Open(pdfContent);
// 2. Create PDF with verification information from the signed PDF.
var pdfMarker = new PdfMarker();
// Build string with joined names of signers (see method getDisplayName() below).
var signerNames = Util.JoinStringsPt(signature.Signers.Select(s => getDisplayName(s.Signer.SigningCertificate)));
var allPagesMessage = string.Format("This document was digitally signed by {0}.\nTo verify the signatures go to {1} on {2} and inform the code {3}", signerNames, VerificationSiteNameWithArticle, VerificationSite, formattedVerificationCode);
// ICP-Brasil logo on bottom-right corner of every page (except on the page which will be created at
// the end of the document).
pdfMarker.AddMark(new PdfMark()
{
PageOption = PdfMarkPageOptions.AllPages,
Container = new PadesVisualRectangle()
{
Width = 1,
Right = 1,
Height = 1,
Bottom = 1
},
Elements = new List <PdfMarkElement>()
{
new PdfMarkImage()
{
ImageContent = Storage.GetIcpBrasilLogoContent(),
Opacity = 75
}
}
});
// Summary on bottom margin of every page (except on the page which will be created at the end of
// the document).
pdfMarker.AddMark(new PdfMark()
{
PageOption = PdfMarkPageOptions.AllPages,
Container = new PadesVisualRectangle()
{
Height = 2,
Bottom = 0,
Left = 1.5,
Right = 3.5
},
Elements = new List <PdfMarkElement>()
{
new PdfMarkText()
{
Texts = new List <PdfTextSection>()
{
new PdfTextSection()
{
Style = PdfTextStyle.Normal,
Text = allPagesMessage
}
}
}
}
});
// Summary on right margin of every page (except on the page which will be created at the end of the
// document), rotated 90 degrees counterclockwise (text goes up).
pdfMarker.AddMark(new PdfMark()
{
PageOption = PdfMarkPageOptions.AllPages,
Container = new PadesVisualRectangle()
{
Width = 2,
Right = 0,
Top = 1.5,
Bottom = 3.5
},
Elements = new List <PdfMarkElement>()
{
new PdfMarkText()
{
Rotation = PdfMarkRotation.D90,
Texts = new List <PdfTextSection>()
{
new PdfTextSection()
{
Style = PdfTextStyle.Normal,
Text = allPagesMessage
}
}
}
}
});
// Create a "manifest" mark on a new page added on the end of the document. We'll add several
// elements to this marks.
var manifestMark = new PdfMark()
{
PageOption = PdfMarkPageOptions.NewPage,
// This mark's container is the whole page with 1-inch margins.
Container = new PadesVisualRectangle()
{
Top = 2.54,
Bottom = 2.54,
Right = 2.54,
Left = 2.54
}
};
// We'll keep track of our "vertical offset" as we add elements to the mark.
double verticalOffset = 0;
double elementHeight;
elementHeight = 3;
// ICP-Brasil logo on the upper-left corner.
manifestMark.Elements.Add(new PdfMarkImage()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = elementHeight,
Top = verticalOffset,
Width = elementHeight, /* Using elemengHeight as width because the image is square. */
Left = 0
},
ImageContent = Storage.GetIcpBrasilLogoContent()
});
// QR Code with the verification link on the upper-right corner. We will generate a PdfMarkImage from
// a QR Code generated using the QRCoder library.
byte[] qrCodeImageContent;
using (var qrGenerator = new QRCodeGenerator()) {
using (var qrCodeData = qrGenerator.CreateQrCode(verificationLink, QRCodeGenerator.ECCLevel.M)) {
using (var qrCode = new QRCode(qrCodeData)) {
var qrCodeBitmap = qrCode.GetGraphic(10, Color.Black, Color.White, false);
using (var buffer = new MemoryStream()) {
qrCodeBitmap.Save(buffer, ImageFormat.Png);
qrCodeImageContent = buffer.ToArray();
};
}
}
}
manifestMark.Elements.Add(new PdfMarkImage()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = elementHeight,
Top = verticalOffset,
Width = elementHeight, /* Using elemengHeight as width because the image is square. */
Right = 0
},
ImageContent = qrCodeImageContent
});
// Header "SIGNATURES VERIFICATION" centered between ICP-Brasil logo and QR Code.
manifestMark.Elements.Add(new PdfMarkText()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = elementHeight,
Top = verticalOffset + 0.2,
Right = 0,
Left = 0
},
Align = PadesHorizontalAlign.Center,
Texts = new List <PdfTextSection>()
{
new PdfTextSection()
{
Style = PdfTextStyle.Normal,
FontSize = NormalFontSize * 1.6,
Text = "SIGNATURES\nVERIFICATION"
}
}
});
verticalOffset += elementHeight;
// Verifical padding.
verticalOffset += 1.7;
// Header with verification code.
elementHeight = 2;
manifestMark.Elements.Add(new PdfMarkText()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = elementHeight,
Top = verticalOffset,
Right = 0,
Left = 0
},
Align = PadesHorizontalAlign.Center,
Texts = new List <PdfTextSection>()
{
new PdfTextSection()
{
Style = PdfTextStyle.Normal,
FontSize = NormalFontSize * 1.2,
Text = string.Format("Verification Code: {0}", formattedVerificationCode)
}
}
});
verticalOffset += elementHeight;
// Paragraph saying "this document was signed by the following signer etc" and mentioning the time zone of the
// date/times below.
elementHeight = 2.5;
manifestMark.Elements.Add(new PdfMarkText()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = elementHeight,
Top = verticalOffset,
Left = 0,
Right = 0
},
Texts = new List <PdfTextSection>()
{
new PdfTextSection()
{
Style = PdfTextStyle.Normal,
FontSize = NormalFontSize,
Text = string.Format("This document was digitally signed by the following signers on the indicated dates ({0}):", TimeZoneDisplayName)
}
}
});
verticalOffset += elementHeight;
// Iterate signers.
foreach (var signer in signature.Signers)
{
elementHeight = 1.5;
// Validate signature based on the PAdES Basic policy.
var policyMapper = PadesPoliciesForGeneration.GetPadesBasic(Util.GetTrustArbitrator());
var validationResults = signature.ValidateSignature(signer, policyMapper);
// Green "check" or red "X" icon depending on result of validation for this signer.
manifestMark.Elements.Add(new PdfMarkImage()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = 0.5,
Top = verticalOffset + 0.2,
Width = 0.5,
Left = 0
},
ImageContent = Storage.GetValidationResultIcon(validationResults.IsValid)
});
// Description of signer (see method getSignerDescription() below).
manifestMark.Elements.Add(new PdfMarkText()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = elementHeight,
Top = verticalOffset,
Left = 0.8,
Right = 0
},
Texts = new List <PdfTextSection>()
{
new PdfTextSection()
{
Style = PdfTextStyle.Normal,
FontSize = NormalFontSize,
Text = getSignerDescription(signer)
}
}
});
verticalOffset += elementHeight;
}
// Some vertical padding from last signer.
verticalOffset += 1;
// Paragraph with link to veritifcation site and citing both the verification code above and the
// verification link below.
elementHeight = 2.5;
manifestMark.Elements.Add(new PdfMarkText()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = elementHeight,
Top = verticalOffset,
Right = 0,
Left = 0
},
Texts = new List <PdfTextSection>()
{
new PdfTextSection()
{
Style = PdfTextStyle.Normal,
FontSize = NormalFontSize,
Text = string.Format("To verify the signatures, go to {0} on ", VerificationSiteNameWithArticle)
},
new PdfTextSection()
{
Color = Color.Blue,
Style = PdfTextStyle.Normal,
FontSize = NormalFontSize,
Text = VerificationSite
},
new PdfTextSection()
{
Style = PdfTextStyle.Normal,
FontSize = NormalFontSize,
Text = " and inform the code above or follow the link below:"
}
}
});
verticalOffset += elementHeight;
// Verification link.
elementHeight = 1.5;
manifestMark.Elements.Add(new PdfMarkText()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = elementHeight,
Top = verticalOffset,
Right = 0,
Left = 0
},
Align = PadesHorizontalAlign.Center,
Texts = new List <PdfTextSection>()
{
new PdfTextSection()
{
Color = Color.Blue,
Style = PdfTextStyle.Normal,
FontSize = NormalFontSize,
Text = verificationLink
}
}
});
pdfMarker.AddMark(manifestMark);
// Prevent from throwing exception when the file to be marked already have a signature (default: true).
pdfMarker.ThrowIfSignedPdf = false;
// Note: Before applying the marks, all signature from the signed file will be removed.
// Apply marks and return the printer-friendly PDF's content.
byte[] pfvContent = pdfMarker.WriteMarks(pdfContent);
return(pfvContent);
}
protected void Page_Load(object sender, EventArgs e)
{
var cadesSignatureContent = Storage.GetSampleCadesSignatureOfPdf();
var cadesSignature = Lacuna.Pki.Cades.CadesSignature.Open(cadesSignatureContent);
var fontSize = 10;
var markTexts = new List <PdfTextSection>()
{
new PdfTextSection()
{
Text = "Document digitally signed by ",
FontSize = fontSize
}
};
for (int i = 0; i < cadesSignature.Signers.Count; i++)
{
var signer = cadesSignature.Signers[i];
if (i > 0)
{
markTexts.Add(new PdfTextSection()
{
Text = i < cadesSignature.Signers.Count - 1 ? ", " : " and ",
FontSize = fontSize
});
}
markTexts.Add(new PdfTextSection()
{
Text = getDisplayName(signer.SigningCertificate),
FontSize = fontSize,
Style = PdfTextStyle.Bold
});
}
var mark = new PdfMark()
{
MeasurementUnits = Lacuna.Pki.Pades.PadesMeasurementUnits.Centimeters,
Container = new Lacuna.Pki.Pades.PadesVisualRectangle()
{
Right = 1,
Top = 1,
Bottom = 1,
Width = 2
},
BorderColor = Color.Black,
BorderWidth = 0.01,
BackgroundColor = Color.FromArgb(77, Color.LightGreen), // Light green with 30% opacity
Elements = new List <PdfMarkElement>()
{
new PdfMarkText()
{
Rotation = PdfMarkRotation.D90,
Texts = markTexts,
RelativeContainer = new Lacuna.Pki.Pades.PadesVisualRectangle()
{
Left = 0.3,
Top = 0.3,
Bottom = 0.3,
Right = 0.3
}
}
}
};
var pdfMarker = new PdfMarker();
pdfMarker.AddMark(mark);
var pdfWithMarks = pdfMarker.WriteMarks(cadesSignature.GetEncapsulatedContent());
Response.ContentType = "application/pdf";
Response.AddHeader("Content-Disposition", "attachment; filename=printable-version.pdf");
Response.BinaryWrite(pdfWithMarks);
Response.End();
}