/// <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 (string element in _tagHelper.StartTags)
{
string srcAttr = _tagHelper.GetAttributeValue(element, "src");
if (string.IsNullOrEmpty(srcAttr))
{
continue;
}
try
{
// this will succeed only with local files (at this time, they don't need to exist yet)
string filename = MakeFullPath(MakeLocalPath(srcAttr));
if (!fileList.Contains(filename))
{
string contentType = Mime.GetContentType(new FileInfo(filename));
var lr = new LinkedResource(new MemoryStream(new ASCIIEncoding().GetBytes(string.Empty)), contentType);
_inlineAtt.Add(new FileAttachment(filename, MakeCid(string.Empty, lr.ContentId, new FileInfo(filename).Extension),
contentType));
_tagHelper.ReplaceTag(element,
_tagHelper.SetAttributeValue(element, "src",
MakeCid("cid:", lr.ContentId, new FileInfo(filename).Extension)));
fileList.Add(filename);
lr.Dispose();
}
}
catch
{
continue;
}
}
}
/// <summary>
/// Creates a new file attachment information
/// </summary>
/// <param name="content">Content for the attachment</param>
/// <param name="displayName">Name and extension as the reader of the mail should see it (in case of inline attachments displayName is used for CIDs</param>
public StringAttachment(string content, string displayName)
{
Content = content;
DisplayName = displayName;
MimeType = Mime.GetContentType(new FileInfo(displayName));
}
/// <summary>
/// Creates a new file attachment information
/// </summary>
/// <param name="fileName">Full path of the file </param>
/// <param name="displayName">Name and extension as the reader of the mail should see it (in case of inline attachments displayName is used for CIDs</param>
public FileAttachment(string fileName, string displayName)
{
Filename = fileName;
DisplayName = displayName;
MimeType = Mime.GetContentType(new FileInfo(fileName));
}
/// <summary>
/// Creates a new file attachment information
/// </summary>
/// <param name="content">Content for the attachment</param>
/// <param name="displayName">Name and extension as the reader of the mail should see it (in case of inline attachments displayName is used for CIDs</param>
/// <param name="mimeType">Mime type of the file</param>
public StringAttachment(string content, string displayName, string mimeType)
{
Content = content;
DisplayName = displayName;
MimeType = string.IsNullOrEmpty(mimeType) ? Mime.GetContentType(new FileInfo(displayName)) : mimeType;
}
/// <summary>
/// Creates a new file attachment information
/// </summary>
/// <param name="fileName">Full path of the file</param>
/// <param name="displayName">Name and extension as the reader of the mail should see it (in case of inline attachments displayName is used for CIDs</param>
/// <param name="mimeType">Mime type of the file</param>
public FileAttachment(string fileName, string displayName, string mimeType)
{
Filename = fileName;
DisplayName = displayName;
MimeType = string.IsNullOrEmpty(mimeType) ? Mime.GetContentType(new FileInfo(fileName)) : mimeType;
}
