(Swift 3,4,5...) Add a Document Timestamp Signature to an already-signed PDF

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Demonstrates how to add a document timestamp signature to an already-signed PDF.

Note: This example requires Chilkat v9.5.0.99 or greater.

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func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let pdf = CkoPdf()!

    // Load the PDF that has already been signed.
    var success: Bool = pdf.loadFile("qa_data/pdf/helloWorld_signed.pdf")
    if success == false {
        print("\(pdf.lastErrorText!)")
        return
    }

    let json = CkoJsonObject()!

    json.updateBool("invisibleSignature", value: true)
    json.update("subFilter", value: "/ETSI.RFC3161")

    json.updateBool("timestampToken.enabled", value: true)

    // In this example, we'll use a free TSA server (timestamp.digicert.com), but you may want to use your own timestamp authority server.
    json.update("timestampToken.tsaUrl", value: "http://timestamp.digicert.com")

    // If the timestamp server requires a username/password, do the following.  Otherwise omit the following few lines of code.
    json.update("timestampToken.tsaUsername", value: "the_tsa_username")
    json.update("timestampToken.tsaPassword", value: "the_tsa_password")

    // When requesting the timestamp token, ask the server to include its certificate in the timestamp token response.
    // This allows for the timestamp server's certificate to be included in the LTV validation (i.e. if the timestamp server
    // has an OCSP URL, then Chilkat will also do the OCSP request for the timestamp server's certificate.)
    json.updateBool("timestampToken.requestTsaCert", value: true)

    success = pdf.sign(json, outFilePath: "c:/temp/qa_output/helloWorld_signed_2.pdf")
    if success == false {
        print("\(pdf.lastErrorText!)")
        return
    }

    print("Successfully added a Document Timestamp Signature to the PDF")

}