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Reading Digital Signatures from InfoPath Forms in MOSS 2007 and WSS 3.0 Workflow

Monday, June 1st, 2009

InfoPath forms with SharePoint workflow is a very powerful combination, especially when you use Digital Signatures to verify the user that is completing the form. Most workflow forms will go through more then one person, and therefore you need to be able to check when the actual form is signed by specific entities in order to continue with your workflow.

I have created a LINQ method of reading these InfoPath files for signature information during a workflow. Please note that this also requires that you have .NET 3.5 enabled on your SharePoint server.

Without further ado, here it is:

List signatures = new List();

SPListItem item = workflowProperties.Item;
using (MemoryStream ms = new MemoryStream(item.File.OpenBinary()))
{
System.Xml.XmlReader reader = System.Xml.XmlReader.Create(ms);
XDocument xDoc = XDocument.Load(reader);

XNamespace nsSig = "http://www.w3.org/2000/09/xmldsig#";
XNamespace nsSigProp = "http://schemas.microsoft.com/office/infopath/2003/SignatureProperties";
var sigs = from sig in xDoc.Descendants(nsSig + "Signature")
select new
Signature
{
ID = sig.Attribute("Id").Value.ToString(),
Text = sig.Descendants(nsSigProp + "SignatureText").First().Value,
Value = sig.Descendants(nsSig + "SignatureValue").First().Value,
X509Certificate = sig.Descendants(nsSig + "X509Certificate").First().Value
};

signatures = sigs.ToList();
reader.Close();
}

There are a number of further attributes that you could grab from this information, but that should get you started off right.

InfoPathin' Tom Out.

Tags

SharePoint CSharp InfoPath

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