/// <summary>
/// Converts the SRC attribute of IMG tags into embedded content ids (cid).
/// Example: <img src="filename.jpg" /< becomes <img src="cid:unique-cid-jpg" /<
/// </summary>
private void ReplaceImgSrcByCid()
{
var fileList = new List <string>();
_tagHelper.TagName = "img";
foreach (var element in _tagHelper.StartTags)
{
var srcAttr = _tagHelper.GetAttributeValue(element, "src");
if (string.IsNullOrEmpty(srcAttr))
{
continue;
}
// this will succeed only with local files (at this time, they don't need to exist yet)
var filename = MakeFullPath(MakeLocalPath(srcAttr));
try
{
if (!fileList.Contains(filename))
{
var fileInfo = new FileInfo(filename);
var contentType = MimeTypes.GetMimeType(filename);
var cid = MimeUtils.GenerateMessageId();
InlineAtt.Add(new FileAttachment(filename, MakeCid(string.Empty, cid, new FileInfo(filename).Extension), contentType));
_tagHelper.ReplaceTag(element, _tagHelper.SetAttributeValue(element, "src", MakeCid("cid:", cid, fileInfo.Extension)));
fileList.Add(filename);
}
}
catch
{
BadInlineFiles.Add(filename);
continue;
}
}
}
/// <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()
{
ReplaceImgSrcByCid();
var htmlTextPart = new TextPart("html")
{
ContentTransferEncoding = Tools.IsSevenBit(DocHtml)
? ContentEncoding.SevenBit
: TextTransferEncoding != ContentEncoding.SevenBit
? TextTransferEncoding
: ContentEncoding.QuotedPrintable,
};
htmlTextPart.SetText(CharacterEncoding, DocHtml); // MimeKit.ContentType.Charset is set using CharacterEncodig
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
{
// create an inline image attachment for the file located at path
var attachment = new AttachmentBuilder(new FileAttachment(ia.Filename, ia.DisplayName, ia.MimeType), CharacterEncoding,
TextTransferEncoding, BinaryTransferEncoding).GetAttachment();
attachment.ContentDisposition = new MimeKit.ContentDisposition(MimeKit.ContentDisposition.Inline);
mpr.Add(attachment);
}
catch (FileNotFoundException)
{
BadInlineFiles.Add(ia.Filename);
}
catch (IOException)
{
BadInlineFiles.Add(ia.Filename);
}
}
return(mpr);
}
/// <summary>
/// Converts the SRC attribute of IMG tags into embedded content ids (cid).
/// Example: <img src="filename.jpg" /< becomes <img src="cid:unique-cid-jpg" /<
/// </summary>
private void ReplaceImgSrcByCid()
{
var fileList = new Dictionary <string, string>();
foreach (var element in _htmlDocument.All.Where(m => m is IHtmlImageElement))
{
var img = (IHtmlImageElement)element;
var currSrc = img.Attributes["src"]?.Value?.Trim();
if (currSrc == null)
{
continue;
}
// replace any placeholders with variables
currSrc = _mailMergeMessage.SearchAndReplaceVars(currSrc, _dataItem);
// Note: if currSrc is a rooted path, _docBaseUrl will be ignored
var currSrcUri = new Uri(_docBaseUri, currSrc);
// img src is not a local file (e.g. starting with "http" or is embedded base64 image), or manually included cid reference
// so we just save the value with placeholders replaced
if (string.IsNullOrEmpty(currSrc) || (currSrcUri.Scheme != UriScheme.File) ||
currSrc.StartsWith("data:image", StringComparison.OrdinalIgnoreCase) || currSrc.StartsWith("cid:", StringComparison.OrdinalIgnoreCase))
{
// leave img.Attributes["src"].Value as it is
continue;
}
// this will succeed only with local files (at this time, they don't need to exist yet)
var filename = _mailMergeMessage.SearchAndReplaceVarsInFilename(currSrcUri.LocalPath, _dataItem);
try
{
if (!fileList.ContainsKey(filename))
{
var fileInfo = new FileInfo(filename);
var contentType = MimeTypes.GetMimeType(filename);
var cid = MimeUtils.GenerateMessageId();
InlineAtt.Add(new FileAttachment(fileInfo.FullName, MakeCid(string.Empty, cid, fileInfo.Extension), contentType));
img.Attributes["src"].Value = MakeCid("cid:", cid, fileInfo.Extension);
fileList.Add(fileInfo.FullName, cid);
}
else
{
var cidForExistingFile = fileList[filename];
var fileInfo = new FileInfo(filename);
img.Attributes["src"].Value = MakeCid("cid:", cidForExistingFile, fileInfo.Extension);
}
}
catch
{
BadInlineFiles.Add(filename);
continue;
}
}
}
/// <summary>
/// Converts the SRC attribute of IMG tags into embedded content ids (cid).
/// Example: <img src="filename.jpg" /< becomes <img src="cid:unique-cid-jpg" /<
/// </summary>
private void ReplaceImgSrcByCid()
{
var fileList = new HashSet <string>();
foreach (var element in _htmlDocument.All.Where(m => m is IHtmlImageElement))
{
var img = (IHtmlImageElement)element;
var currSrc = img.Attributes["src"]?.Value;
if (currSrc == null)
{
continue;
}
// replace any placeholders with variables
currSrc = _mailMergeMessage.SearchAndReplaceVars(currSrc, _dataItem);
// img scr is not a local file (e.g. starting with "http"), so we just save the value with placeholders replaced
if (!string.IsNullOrEmpty(currSrc) && !new Uri(MakeUri(currSrc)).IsFile)
{
img.Attributes["src"].Value = currSrc;
continue;
}
// this will succeed only with local files (at this time, they don't need to exist yet)
var filename = MakeFullPath(MakeLocalPath(currSrc));
try
{
if (!fileList.Contains(filename))
{
var fileInfo = new FileInfo(filename);
var contentType = MimeTypes.GetMimeType(filename);
var cid = MimeUtils.GenerateMessageId();
InlineAtt.Add(new FileAttachment(fileInfo.FullName, MakeCid(string.Empty, cid, fileInfo.Extension), contentType));
img.Attributes["src"].Value = MakeCid("cid:", cid, fileInfo.Extension);
fileList.Add(fileInfo.FullName);
}
}
catch
{
BadInlineFiles.Add(filename);
continue;
}
}
}
/// <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 = Tools.IsSevenBit(DocHtml)
? ContentEncoding.SevenBit
: TextTransferEncoding != ContentEncoding.SevenBit
? TextTransferEncoding
: ContentEncoding.QuotedPrintable,
};
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);
}
