/*
* This method defines the visual representation for each signature.
*/
private PadesVisualRepresentation getVisualRepresentation()
{
return(new PadesVisualRepresentation()
{
// The tags {{name}} and {{national_id}} will be substituted according to the user's certificate
//
// name : full name of the signer
// national_id : if the certificate is ICP-Brasil, contains the signer's CPF
//
// For more information, see: https://github.com/LacunaSoftware/RestPkiSamples/blob/master/PadesTags.md
Text = new PadesVisualText("Signed by {{name}} ({{national_id}})")
{
// Specify that the signing time should also be rendered
IncludeSigningTime = true,
// Optionally set the horizontal alignment of the text ('Left' or 'Right'), if not set the default is Left
HorizontalAlign = PadesTextHorizontalAlign.Left
},
// We'll use as background the image in Content/PdfStamp.png
Image = new PadesVisualImage(Util.GetPdfStampContent(), "image/png")
{
// Opacity is an integer from 0 to 100 (0 is completely transparent, 100 is completely opaque)
Opacity = 50,
// Align the image to the right
HorizontalAlign = PadesHorizontalAlign.Right
},
// Position of the visual representation. We have encapsulated this code in a method to include several
// possibilities depending on the argument passed. Experiment changing the argument to see different examples
// of signature positioning. Once you decide which is best for your case, you can place the code directly here.
Position = PadesVisualElements.GetVisualPositioning(1)
});
}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
// Get an instance of the PadesSignatureStarter class, responsible for receiving the signature elements and start the
// signature process
var signatureStarter = Util.GetRestPkiClient().GetPadesSignatureStarter();
// Set the unit of measurement used to edit the pdf marks and visual representations
signatureStarter.MeasurementUnits = PadesMeasurementUnits.Centimeters;
// Set the file to be signed as a byte array
signatureStarter.SetPdfToSign(Util.GetSampleDocContent());
// Set the signature policy
signatureStarter.SetSignaturePolicy(StandardPadesSignaturePolicies.Basic);
// Set a SecurityContext to be used to determine trust in the certificate chain
signatureStarter.SetSecurityContext(StandardSecurityContexts.PkiBrazil);
// Note: By changing the SecurityContext above you can accept only certificates from a certain PKI,
// for instance, ICP-Brasil (Lacuna.RestPki.Api.StandardSecurityContexts.PkiBrazil).
// Set a visual representation for the signature
signatureStarter.SetVisualRepresentation(new PadesVisualRepresentation()
{
// The tags {{signerName}} and {{signerNationalId}} will be substituted according to the user's certificate
// signerName -> full name of the signer
// signerNationalId -> if the certificate is ICP-Brasil, contains the signer's CPF
Text = new PadesVisualText("Signed by {{signerName}} ({{signerNationalId}})")
{
// Specify that the signing time should also be rendered
IncludeSigningTime = true,
// Optionally set the horizontal alignment of the text ('Left' or 'Right'), if not set the default is Left
HorizontalAlign = PadesTextHorizontalAlign.Left
},
// We'll use as background the image in Content/PdfStamp.png
Image = new PadesVisualImage(Util.GetPdfStampContent(), "image/png")
{
// Opacity is an integer from 0 to 100 (0 is completely transparent, 100 is completely opaque).
Opacity = 50,
// Align the image to the right
HorizontalAlign = PadesHorizontalAlign.Right
},
// Position of the visual representation. We have encapsulated this code in a method to include several
// possibilities depending on the argument passed. Experiment changing the argument to see different examples
// of signature positioning. Once you decide which is best for your case, you can place the code directly here.
Position = PadesVisualElements.GetVisualPositioning(1)
});
/*
* Optionally, add marks to the PDF before signing. These differ from the signature visual representation in that
* they are actually changes done to the document prior to signing, not binded to any signature. Therefore, any number
* of marks can be added, for instance one per page, whereas there can only be one visual representation per signature.
* However, since the marks are in reality changes to the PDF, they can only be added to documents which have no previous
* signatures, otherwise such signatures would be made invalid by the changes to the document (see property
* PadesSignatureStarter.BypassMarksIfSigned). This problem does not occurr with signature visual representations.
*
* We have encapsulated this code in a method to include several possibilities depending on the argument passed.
* Experiment changing the argument to see different examples of PDF marks. Once you decide which is best for your case,
* you can place the code directly here.
*/
//signatureStarter.PdfMarks.Add(PadesVisualElements.GetPdfMark(1));
// Call the StartWithWebPki() method, which initiates the signature. This yields the token, a 43-character
// case-sensitive URL-safe string, which identifies this signature process. We'll use this value to call the
// signWithRestPki() method on the Web PKI component (see javascript on the view) and also to complete the signature
// on the POST action below (this should not be mistaken with the API access token).
var token = signatureStarter.StartWithWebPki();
ViewState["Token"] = token;
}
}