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Topic: Convert Embedded Images to Attachments

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Deantwo
Newbie
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Joined: 10 January 2018
Location: Denmark
Online Status: Offline
Posts: 5

Posted: 12 January 2018 at 7:06am \| IP Logged

Since some mail clients don't support embedded images in HTML mails (see this thread), I had to extract the embedded images and attach them as inline attachments.

Just thought I would share what I ended up doing here for others to use.

C# code:
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
doc.LoadHtml(_body);
foreach (HtmlAgilityPack.HtmlNode img in doc.DocumentNode.SelectNodes("//img"))
{
    string src = img.GetAttributeValue("src", null);
    if (string.IsNullOrEmpty(src))
        continue;

    // Embedded inline image.
    if (src.StartsWith("data:"))
    {
        int p1 = src.IndexOf(';'), p2 = src.IndexOf(',');
        string mime = src.Substring(5, p1 - 5);
        string encoding = src.Substring(p1 + 1, p2 - p1 - 1);
        if (encoding.ToLower() != "base64")
            throw new Exception("Invalid data encoding.");
        byte[> data = Convert.FromBase64String(src.Substring(p2 + 1));
        string cId = System.Guid.NewGuid().ToString();
        _mailer.Message.Attachments.Add(data, string.Empty, cId, mime, null, MailBee.Mime.NewAttachmentOptions.None, MailBee.Mime.MailTransferEncoding.Base64);
        img.SetAttributeValue("src", "cid:" + cId);
    }
}
_mailer.Message.BodyHtmlText = doc.DocumentNode.OuterHtml;
_mailer.Message.MakePlainBodyFromHtmlBody();

I used HtmlAgilityPack to read the HTML.

Would have loved it if MailBee had a function to do this automatically.
You can consider this a feature request I guess? And look I did a chuck of the work for you. ^^