/// <summary>
/// Adds external inline attachments (linked resources of the HTML body) of a mail message.
/// They are normally generated automatically with all image sources pointing to local files,
/// but with this method such files can be added as well.
/// </summary>
/// <param name="att"></param>
public void AddExternalInlineAttachment(FileAttachment att)
{
_inlineAttExternal.Add(att);
}
/// <summary>
/// Gets the ready made body part for a mail message either
/// - as TextPart, if there are no inline attachments
/// - as MultipartRelated with a TextPart and one or more MimeParts of type inline attachments
/// </summary>
public override MimeEntity GetBodyPart()
{
// remove all Script elements, because they cannot be used in mail messages
foreach (var element in _htmlDocument.All.Where(e => e is IHtmlScriptElement).ToList())
{
element.Remove();
}
// set the HTML title tag from email subject
var titleEle = _htmlDocument.All.FirstOrDefault(m => m is IHtmlTitleElement) as IHtmlTitleElement;
if (titleEle != null)
{
titleEle.Text = _mailMergeMessage.SearchAndReplaceVars(_mailMergeMessage.Subject, _dataItem);
}
// read the <base href="..."> tag in order to find the embedded image files later on
var baseEle = _htmlDocument.All.FirstOrDefault(m => m is IHtmlBaseElement) as IHtmlBaseElement;
var baseDir = baseEle?.Href == null ? null : new Uri(baseEle.Href);
// only replace the base url if it was not set programmatically
if (_docBaseUri == null)
{
_docBaseUri = baseDir;
}
// remove if base tag is local file reference, because it's not usable in the resulting HTML
if (baseEle != null && baseDir != null && baseDir.Scheme == UriScheme.File)
{
baseEle.Remove();
}
ReplaceImgSrcByCid();
// replace placeholders only in the HTML Body, because e.g.
// in the header there may be CSS definitions with curly brace which collide with SmartFormat {placeholders}
_htmlDocument.Body.InnerHtml = _mailMergeMessage.SearchAndReplaceVars(_htmlDocument.Body.InnerHtml, _dataItem);
var htmlTextPart = new TextPart("html")
{
ContentTransferEncoding = TextTransferEncoding
};
htmlTextPart.SetText(CharacterEncoding, DocHtml); // MimeKit.ContentType.Charset is set using CharacterEncoding
htmlTextPart.ContentId = MimeUtils.GenerateMessageId();
if (!InlineAtt.Any())
{
return(htmlTextPart);
}
/*
* multipart/related
* text/html
* image/jpeg
* image/png
* image/gif...
*/
var mpr = new MultipartRelated(htmlTextPart);
// Produce attachments as part of the multipart/related MIME part,
// as described in RFC2387
// Some older clients may need Inline Attachments instead of LinkedResources:
// RFC2183: 2.1 The Inline Disposition Type
// A bodypart should be marked `inline' if it is intended to be displayed automatically upon display of the message. Inline
// bodyparts should be presented in the order in which they occur, subject to the normal semantics of multipart messages.
foreach (var ia in InlineAtt)
{
try
{
var readyInlineAtt = new FileAttachment(_mailMergeMessage.SearchAndReplaceVarsInFilename(ia.Filename, _dataItem), _mailMergeMessage.SearchAndReplaceVars(ia.DisplayName, _dataItem));
// create an inline image attachment for the file located at path
var attachment = new AttachmentBuilder(readyInlineAtt, CharacterEncoding,
TextTransferEncoding, BinaryTransferEncoding).GetAttachment();
attachment.ContentDisposition = new ContentDisposition(ContentDisposition.Inline);
attachment.ContentId = ia.DisplayName;
attachment.FileName = null; // not needed for inline attachments, save some space
mpr.Add(attachment);
}
catch (FileNotFoundException)
{
BadInlineFiles.Add(ia.Filename);
}
catch (IOException)
{
BadInlineFiles.Add(ia.Filename);
}
}
return(mpr);
}