(JavaScript) Iterate MIME Parts of an Email

Demonstrates how to iterate over the MIME sub-parts of an email, and retrieve the content of each MIME sub-part body.

Note: This example requires some new features added to Chilkat v9.5.0.95.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

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

// See the following Chilkat post to Quickly Understand Email MIME

var email = new CkEmail();

success = email.LoadEml("qa_data/eml/sample.eml");
if (success == false) {
    console.log("Failed to load .eml");
    return;
}

var sbContentType = new CkStringBuilder();
var caseSensitive = false;

// Get the total number of non-multipart MIME sub-parts.
// (This is a simple way of iterating over all the MIME leaf parts regardless of the MIME tree structure)
var inlineOnly = false;
var excludeAttachments = false;
var searchSpec = "*/*";

var numParts = email.GetNumPartsOfType(searchSpec,inlineOnly,excludeAttachments);
var i = 0;
while (i < numParts) {
    // What is the Content-Type of this MIME part?
    sbContentType.Append(email.GetNthContentType(i,searchSpec,inlineOnly,excludeAttachments));
    if (sbContentType.StartsWith("text/",caseSensitive) == true) {
        // Get the text body of this MIME part.
        var textBody = email.GetNthTextPartOfType(i,searchSpec,inlineOnly,excludeAttachments);
        console.log("Got text body for " + sbContentType.GetAsString());
    }
    else {
        if (sbContentType.ContentsEqual("message/rfc822",caseSensitive) == true) {
            // If the Content-Type is message/rfc822, then the MIME body for this part contains a full embedded MIME messages.
            // Your application could load it into a Chilkat email object and recursively process...
            var attachedEmail = new CkEmail();
            var bdMime = new CkBinData();
            email.GetNthBinaryPartOfTypeBd(i,searchSpec,inlineOnly,excludeAttachments,bdMime);
            attachedEmail.SetFromMimeBd(bdMime);
            // Now your app can recursively process the attachedEmail...
        }
        else {
            // Get the bytes of this MIME body part.
            var bd = new CkBinData();
            email.GetNthBinaryPartOfTypeBd(i,searchSpec,inlineOnly,excludeAttachments,bd);
            console.log("Got binary body for " + sbContentType.GetAsString() + " numBytes = " + bd.NumBytes);
        }

    }

    sbContentType.Clear();
    i = i+1;
}