PDF Expiry support?

PDF Expiry support?

Posted by: mkulik on 13 November 2018, 9:00 am EST

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  mkulik

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  Posted 13 November 2018, 9:00 am EST

  I can’t find any information on how we might use this api to generate a PDF that can expire. Is it possible to do that?

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  esha.dhir

  

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  Posted 13 November 2018, 9:17 pm EST

  Hello,

  PDF expiration is not supported with Documents for PDF.
  
  Let us know if you need further assistance.

  Best Regards,
  
  Esha

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  dmitry.yaitskov

  

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  Posted 19 November 2018, 5:18 pm EST

  Hi,

  AFAIK, there is no standard mechanism built into PDF (defined in the spec) that provides real document expiration. But, there is a way to imitate expiration when the PDF is opened in a viewer that supports JavaScript (e.g. Adobe Acrobat), attached is a working example, here is the relevant code:

  
      public class PdfExpire
      {
          // Expiry date (year, month index, day):
          const string expDate = "2018, 10, 19";
  
          readonly string jsclose =
              "var rightNow = new Date();\r\n" +
              $"var endDate = new Date({expDate});\r\n" +
              "if(rightNow.valueOf() > endDate.valueOf()) {\r\n" +
              // Remove next line to close the document right away without alert:
              "app.alert(\"This Document has Expired.\");\r\n" +
              "this.closeDoc();\r\n" +
              "}\r\n" +
              "";
  
          public void CreatePDF(Stream stream)
          {
              var doc = new GcPdfDocument();
              var page = doc.NewPage();
              var g = page.Graphics;
  
              // Invisible button with action activated on page open:
              var btnExpire = new PushButtonField();
              btnExpire.Widget.Locked = true;
              btnExpire.Widget.Rect = RectangleF.Empty;
              // The JavaScript will compare the current date with the expiry date,
              // and will close the document if the expiry date is in the past:
              btnExpire.Widget.Events.AnnotationPageOpened = new ActionJavaScript(jsclose);
              btnExpire.Widget.Page = page;
              doc.AcroForm.Fields.Add(btnExpire);
  
              Common.Util.AddNote(
                  $"If opened in a PDF viewer that supports JavaScript actions, this document will close if the current date is past {expDate} (2nd number is month's 0-based index).",
                  page);
              // Done:
              doc.Save(stream);
          }
      }
  
  ```[zip filename="PdfExpire.zip"]https://gccontent.blob.core.windows.net/forum-uploads/file-9717ff39-326a-494c-a3d4-ed617093d108.zip[/zip]
  
  Hope this helps.