private static void FixEmailBody(EmailBody emailBody)
{
var htmlCharset = new Regex("\\<meta.*?charset=(?<charset>[a-zA-Z0-9\\-]*).*?\\>")
.Match(emailBody.Content)
.Groups["charset"]
.Value;
if (!string.IsNullOrEmpty(htmlCharset))
{
emailBody.Charset = htmlCharset;
return;
}
var content = emailBody.Content;
var meta = string.Format("<meta http-equiv=\"content-type\" content=\"text/html;charset={0}\"/>", emailBody.Charset);
var bodyIndex = content.IndexOf("<body", 0, StringComparison.InvariantCultureIgnoreCase);
var htmlIndex = content.IndexOf("<html", 0, StringComparison.InvariantCultureIgnoreCase);
if (bodyIndex < 0)
{
content = string.Format("<body>\r\n{0}\r\n</body>", content);
}
var insertIndex = content.IndexOf("</head>", 0, StringComparison.InvariantCultureIgnoreCase);
if (insertIndex < 0)
{
meta = string.Format("<head>\r\n{0}\r\n</head>", meta);
insertIndex = content.IndexOf("<body", 0, StringComparison.InvariantCultureIgnoreCase);
}
content = content.Insert(insertIndex, meta);
if (htmlIndex < 0)
{
content = string.Format("<html>\r\n{0}\r\n</html>", content);
}
emailBody.Content = content;
}
private static EmailBody ProcessMailPartsRecursively(string partBody, string boundary, int recursionLevel = 0)
{
if (string.IsNullOrEmpty(partBody) || string.IsNullOrEmpty(boundary)) return null;
boundary = boundary.EscapeRegexpSpecialChars();
var re = new Regex(string.Format(MailPartDividerPattern, boundary), RegexOptions.IgnoreCase | RegexOptions.Singleline);
var parts = re.Matches(partBody);
var count = parts.Count;
EmailBody result = null;
for (var i = count - 1; i >= 0; i--)
{
var part = parts[i];
var contentType = part.Value.GetHeaderValue("content-type");
var headerCharset = part.Value.GetHeaderValue("content-type", "charset");
if (IsMultipartContent(contentType))
{
var subBoundary = part.Value.GetHeaderValue("content-type", "boundary");
result = ProcessMailPartsRecursively(part.Value, subBoundary, ++recursionLevel);
}
if (result != null)
{
break;
}
if (!contentType.Equals(HtmlContentType, StringComparison.InvariantCultureIgnoreCase) && (i > 0 || recursionLevel != 0)) continue;
var match = new Regex(MailPartDetailsPattern, RegexOptions.Singleline).Match(part.Value);
result = new EmailBody
{
Content = match.Value,
ContentType = contentType,
ContentEncoding = part.Value.GetHeaderValue("content-transfer-encoding"),
Charset = headerCharset
};
break;
}
return result;
}