Node.js

PDF Signatures with Built-in SVG Graphics

See more PDF Signatures Examples

This example demonstrates the built-in SVG graphics that can be applied to the appearance when signing a PDF.

Note: This example requires Chilkat v9.5.0.85 or greater.

Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    var pdf = new chilkat.Pdf();

    //  Load a PDF to be signed.
    //  The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
    success = pdf.LoadFile("qa_data/pdf/hello.pdf");
    if (success == false) {
        console.log(pdf.LastErrorText);
        return;
    }

    //  Options for signing are specified in JSON.
    var json = new chilkat.JsonObject();

    //  In most cases, the signingCertificateV2 and signingTime attributes are required.
    json.UpdateInt("signingCertificateV2",1);
    json.UpdateInt("signingTime",1);

    //  Specify the location/position, scale, and content of the signature's appearance.
    json.UpdateInt("page",1);
    json.UpdateString("appearance.y","top");
    json.UpdateString("appearance.x","left");
    json.UpdateString("appearance.fontScale","10.0");
    json.UpdateString("appearance.text[0]","Digitally signed by: cert_cn");
    json.UpdateString("appearance.text[1]","current_dt");
    json.UpdateString("appearance.text[2]","The crazy brown fox jumps over the lazy dog.");

    //  In addition to the above, this example adds a built-in SVG graphic to the appearance.
    //  The built-in SVG graphic is specified by a name, such as "green-check-grey-circle".
    //  The full list of graphic names and images are shown below.
    json.UpdateString("appearance.image","green-check-grey-circle");

    //  The graphic can be placed "left", "center", or "right".
    //  If "center", then the graphic is displayed behind the text.
    json.UpdateString("appearance.imagePlacement","left");

    //  The graphic's opacity can range from 1 to 100.
    //  Centered graphics look best with less opacity (50 or less).
    //  In this example, we'll keep the opacity at 100.
    json.UpdateString("appearance.imageOpacity","100");

    //  Here's an example of the signature's appearance if we centered the SVG graphic with an opacity of 40%
    //  (image:https://example-code.com/images/centered_svg.jpg/endImage)

    //  Load the signing certificate. (Use your own certificate.)
    var cert = new chilkat.Cert();
    success = cert.LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx","secret");
    if (success == false) {
        console.log(cert.LastErrorText);
        return;
    }

    //  Tell the pdf object to use the certificate for signing.
    success = pdf.SetSigningCert(cert);
    if (success == false) {
        console.log(pdf.LastErrorText);
        return;
    }

    success = pdf.SignPdf(json,"qa_output/hello_signed.pdf");
    if (success == false) {
        console.log(pdf.LastErrorText);
        return;
    }

    console.log("The PDF has been successfully cryptographically signed.");

    //  The appearance of the signature appears in Adobe Acrobat as shown here:

    //  (image:https://example-code.com/images/pdf_signature_green_check_grey_circle.jpg/endImage)

    //  The SVG icon graphics are embedded within the Chilkat library, 
    //  and were graciously provided by uxwing - Free SVG Icons 
    //  
    //  The uxwing licensing terms are reproduced here and can be verified at uxwing licensing

    //  Icons from uxwing.com are free (see https://uxwing.com/license/)
    //  	- All icons on UXWing free to download, and use personal, commercial projects.
    //  	- Attribution and Credit is NOT required, however, any credit will be much appreciated.
    //  	- There is no limit to the number of times you can use.
    //  	- You may modify the resources according to your requirements.

    //  The set of SVG names and the corresponding graphics are shown below.
    //  
    //  For example, if we specify "green-check-green-circle"
    json.UpdateString("appearance.image","green-check-green-circle");
    //  We get:
    //  (image:https://example-code.com/images/green-check-green-circle.jpg/endImage)

    //  "application-approved"
    //  (image:https://example-code.com/images/application-approved.jpg/endImage)

    //  "application-rejected"
    //  (image:https://example-code.com/images/application-rejected.jpg/endImage)

    //  "document-accepted"
    //  (image:https://example-code.com/images/document-accepted.jpg/endImage)

    //  "approved"
    //  (image:https://example-code.com/images/approved.jpg/endImage)

    //  "blue-check-mark"
    //  (image:https://example-code.com/images/blue-check-mark.jpg/endImage)

    //  "green-check-mark"
    //  (image:https://example-code.com/images/green-check-mark.jpg/endImage)

    //  "green-check-grey-circle"
    //  (image:https://example-code.com/images/green-check-grey-circle.jpg/endImage)

    //  "red-x-red-circle"
    //  (image:https://example-code.com/images/red-x-red-circle.jpg/endImage)

    //  "rejected"
    //  (image:https://example-code.com/images/rejected.jpg/endImage)

    //  "result-failure"
    //  (image:https://example-code.com/images/result-failure.jpg/endImage)

    //  "result-pass"
    //  (image:https://example-code.com/images/result-pass.jpg/endImage)

    //  "signature"
    //  (image:https://example-code.com/images/signature.jpg/endImage)

    //  "document-check"
    //  (image:https://example-code.com/images/document-check.jpg/endImage)

    //  "document-x"
    //  (image:https://example-code.com/images/document-x.jpg/endImage)

    //  "red-x-grey-circle"
    //  (image:https://example-code.com/images/red-x-grey-circle.jpg/endImage)

}

chilkatExample();