(Node.js) Scan for Emails with Attachments and Save Attachments to Files

Scan for emails with attachments and save attachments.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOS

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

    // 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;
    var success = imap.Connect("imap.someMailServer.com");
    if (success !== true) {
        console.log(imap.LastErrorText);
        return;
    }

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

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

    // messageSet: MessageSet
    var messageSet;
    // We can choose to fetch UIDs or sequence numbers.
    var fetchUids = true;

    // Get the message IDs of all the emails in the mailbox
    messageSet = imap.Search("ALL",fetchUids);
    if (imap.LastMethodSuccess !== true) {
        console.log(imap.LastErrorText);
        return;
    }

    // Fetch the email headers into a bundle object:
    // bundle: EmailBundle
    var bundle;
    bundle = imap.FetchHeaders(messageSet);
    if (imap.LastMethodSuccess !== true) {

        console.log(imap.LastErrorText);
        return;
    }

    // Scan for emails with attachments, and save the attachments
    // to a sub-directory.
    var i;
    for (i = 0; i <= bundle.MessageCount - 1; i++) {
        // email: Email
        var email;
        email = bundle.GetEmail(i);

        // Does this email have attachments?
        // Use GetMailNumAttach because the attachments
        // are not actually in the email object because
        // we only downloaded headers.
        // (Had we downloaded the full emails by
        // calling mailman.FetchBundle, we could look
        // at the email object's NumAttachments property.)
        var numAttach = imap.GetMailNumAttach(email);

        if (numAttach > 0) {
            // Download the entire email and save the
            // attachments. (Remember, we 
            // need to download the entire email because
            // only the headers were previously downloaded.
            // If the entire emails were downloaded by
            // calling FetchBundle instead of FetchHeaders,
            // this would not be necessary.

            // The ckx-imap-uid header field is added when
            // headers are downloaded.  This makes it possible
            // to get the UID from the email object.
            var uidStr = email.GetHeaderField("ckx-imap-uid");
            var uid = uidStr;

            // fullEmail: Email
            var fullEmail;
            fullEmail = imap.FetchSingle(uid,true);
            if (imap.LastMethodSuccess == true) {
                success = fullEmail.SaveAllAttachments("attachmentsDir");

            }

            var j;
            for (j = 0; j <= numAttach - 1; j++) {
                var filename = imap.GetMailAttachFilename(email,j);
                console.log(filename);
            }

        }

    }

    // Disconnect from the IMAP server.
    success = imap.Disconnect();


}

chilkatExample();