(Swift 3,4,5...) Get Certificate User Principal Name (UPN)

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Demonstrates how to get a certificate's UPN from the SAN (Subject Alternative Name). Most certificates do not have a UPN. This example only applies to those certificates that have a User Principal Name.

Note: This example requires Chilkat v9.5.0.90 or greater due to fixes made in getting the UPN from the SAN.

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func chilkatTest() {
    let cert = CkoCert()!

    var success: Bool = cert.load(fromFile: "qa_data/certs/sample.cer")
    if success == false {
        print("\(cert.lastErrorText!)")
        return
    }

    let xml = CkoXml()!
    xml.load(cert.subjectAlternativeName)
    print("\(xml.getXml()!)")

    // A certificate with a User Principal Name in the SAN might have this:

    // <SubjectAltName>
    //     <rfc822Name>joe@example.com</rfc822Name>
    //     <name type="oid" oid="1.3.6.1.4.1.311.20.2.3">joe@example.com</name>
    // </SubjectAltName>

    // The OID 1.3.6.1.4.1.311.20.2.3 is for the User Principal Name.
    var upn: String? = xml.chilkatPath("/A/name,oid,1.3.6.1.4.1.311.20.2.3|*")
    if xml.lastMethodSuccess == false {
        print("No user principle name.")
    }
    else {
        print("User Principle Name = \(upn!)")
    }


}