Node.js

IMAP Download and Verify Signed MIME

See more IMAP Examples

Downloads the original MIME of a digitally signed email and saves the .p7s signature along with other MIME parts. It then imports the email into a Chilkat email object to unwrap the S/MIME and verify the signature, and subsequently saves the attachments if they haven't been saved already. 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 imap = new chilkat.Imap();

    // Connect to an IMAP server.
    // Use TLS
    imap.Ssl = true;
    imap.Port = 993;
    success = imap.Connect("imap.example.com");
    if (success == false) {
        console.log(imap.LastErrorText);
        return;
    }

    success = imap.Login("myLogin","myPassword");
    if (success == false) {
        console.log(imap.LastErrorText);
        return;
    }

    // Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox");
    if (success == false) {
        console.log(imap.LastErrorText);
        return;
    }

    // Download the 1st email (as MIME) in the Inbox by sequence number.
    var sbMime = new chilkat.StringBuilder();
    success = imap.FetchSingleAsMimeSb(1,false,sbMime);
    if (success == false) {
        console.log(imap.LastErrorText);
        return;
    }

    // Load it into a MIME object and check to see if it is signed
    var mime = new chilkat.Mime();
    mime.LoadMimeSb(sbMime);
    var alreadySavedParts = false;
    if (mime.ContainsSignedParts() == true) {

        // This will save the .p7s and other parts...
        var st = new chilkat.StringTable();
        success = mime.PartsToFiles("c:/temp/qa_output",st);
        if (success == true) {
            var numFiles = st.Count;
            var i = 0;
            while (i < numFiles) {
                console.log("Created: " + st.StringAt(i));
                i = i+1;
            }

            alreadySavedParts = true;
        }

    }

    // Load the MIME into an Email object.  This unwraps the security layers and verifies signatures.
    var email = new chilkat.Email();
    email.SetFromMimeSb(sbMime);

    if (email.ReceivedSigned == true) {

        console.log("This email was signed.");

        // Check to see if the signatures were verified.
        if (email.SignaturesValid == true) {
            console.log("Digital signature(s) verified.");

            console.log("Signer: " + email.SignedBy);

            // The certificate used for signing may be obtained
            // by calling email.GetSignedByCert.
            var cert = new chilkat.Cert();
            success = email.LastSignerCert(i,cert);
            if (success == false) {
                console.log("Failed to get signing certificate object.");
            }
            else {
                console.log("Signing cert: " + cert.SubjectCN);
            }

        }

    }
    else {
        console.log("Digital signature verification failed.");
    }

    if (alreadySavedParts !== true) {
        email.SaveAllAttachments("c:/temp/qa_output");
    }


}

chilkatExample();