public static async Task TwoChildrenTest()
{
var stream = typeof(MimeTests).GetResource("testdata.two-children.eml");
MimeReader reader = new MimeReader();
var structure = await reader.ReadStructureAsync(stream, CancellationToken.None);
await TestContent(structure,
stream,
new ExpectedPart(
new Dictionary <string, string>
{
{ "From", " From Name <*****@*****.**>" },
{ "To", " To Name<*****@*****.**>" },
{ "Subject", " Sample message" },
{ "MIME-Version", " 1.0" },
{ "Content-Type", " multipart/mixed; boundary=\"simple boundary\"" },
},
"This is the preamble. It is to be ignored, though it\r\nis a handy place for mail composers to include an\r\nexplanatory note to non-MIME compliant readers.",
"This is the epilogue. It is also to be ignored.\r\n",
new ExpectedPart(
new Dictionary <string, string>(),
"This is implicitly typed plain ASCII text.\r\nIt does NOT end with a linebreak."),
new ExpectedPart(
new Dictionary <string, string>
{
{ "Content-type", " text/plain; charset=us-ascii" },
},
"This is explicitly typed plain ASCII text.\r\nIt DOES end with a linebreak.\r\n"))
);
}
public static async Task Nested()
{
var stream = typeof(MimeTests).GetResource("testdata.nested.eml");
MimeReader reader = new MimeReader();
var structure = await reader.ReadStructureAsync(stream, CancellationToken.None);
await TestContent(structure,
stream,
new ExpectedPart(
new Dictionary <string, string>
{
{ "MIME-Version", " 1.0" }, { "From", " Nathaniel Borenstein <*****@*****.**>" },
{ "To", " Ned Freed <*****@*****.**>" }, { "Subject", " A multipart example" },
{ "Content-Type", " multipart/mixed;\r\n boundary=unique-boundary-1" },
},
"This is the preamble area of a multipart message.\r\nMail readers that understand multipart format\r\nshould ignore this preamble.\r\nIf you are reading this text, you might want to\r\nconsider changing to a mail reader that understands\r\nhow to properly display multipart messages.",
"",
new ExpectedPart(
new Dictionary <string, string>(),
"\r\n...Some text appears here...\r\n\r\n\r\n[Note that the preceding blank line means\r\nno header fields were given and this is text,\r\nwith charset US ASCII. It could have been\r\ndone with explicit typing as in the next part.]\r\n"),
new ExpectedPart(new Dictionary <string, string>
{
{ "Content-type", " text/plain; charset=US-ASCII" },
},
"This could have been part of the previous part,\r\nbut illustrates explicit versus implicit\r\ntyping of body parts.\r\n"),
new ExpectedPart(new Dictionary <string, string>
{
{ "Content-Type", " multipart/parallel;\r\n boundary=\"unique-\\\"boundary-2\\\"\"" },
},
"",
"",
new ExpectedPart(new Dictionary <string, string>
{
{ "Content-Type", " audio/basic" }, { "Content-Transfer-Encoding", " base64" },
},
"\r\n... base64-encoded 8000 Hz single-channel\r\n mu-law-format audio data goes here....\r\n"),
new ExpectedPart(new Dictionary <string, string>
{
{ "Content-Type", " image/gif" }, { "Content-Transfer-Encoding", " base64" },
},
"\r\n... base64-encoded image data goes here....\r\n\r\n")
),
new ExpectedPart(new Dictionary <string, string>
{
{ "Content-type", " text/richtext" },
},
"This is <bold><italic>richtext.</italic></bold>\r\n<smaller>as defined in RFC 1341</smaller>\r\n<nl><nl>Isn\'t it\r\n<bigger><bigger>cool?</bigger></bigger>\r\n"),
new ExpectedPart(new Dictionary <string, string> {
{ "Content-Type", " message/rfc822" },
},
"From: (mailbox in US-ASCII)\r\nTo: (address in US-ASCII)\r\nSubject: (subject in US-ASCII)\r\nContent-Type: Text/plain; charset=ISO-8859-1\r\nContent-Transfer-Encoding: Quoted-printable\r\n\r\n\r\n... Additional text in ISO-8859-1 goes here ...\r\n\r\n")
)
);
}
public static async Task SimpleMimeTest()
{
var stream = typeof(MimeTests).GetResource("testdata.simple.eml");
MimeReader reader = new MimeReader();
var structure = await reader.ReadStructureAsync(stream, CancellationToken.None);
await TestContent(structure,
stream,
new ExpectedPart(
new Dictionary <string, string>
{
{ "Return-Path", " <*****@*****.**>" },
{ "From", " \"Sender Name\" <*****@*****.**>" },
{ "To", " \"Recipient Name\" <*****@*****.**>,\r\n\t\"Other Name\" <*****@*****.**>" },
{ "Subject", " Sample subject" },
{ "MIME-Version", " 1.0" },
{ "Content-Type", " text/plain;\r\n\tcharset=\"us-ascii\"" },
{ "Content-Transfer-Encoding", " 7bit" },
},
"Test body\r\n\r\nTest paragraph\r\n"
)
);
}
/// <summary>
/// If "*****@*****.**" is replying to something sent to "*****@*****.**",
/// replace the "me@example" in the mail
/// </summary>
public static async Task <(Stream, string)> ReplaceSenderAsync(
IDictionary <string, IEnumerable <string> > headers,
Stream bodyStream,
string sender,
CancellationToken token)
{
bodyStream.Seek(0, SeekOrigin.Begin);
if (!headers.TryGetValue("References", out IEnumerable <string> referenes))
{
return(bodyStream, sender);
}
foreach (var r in referenes)
{
Match match = ReferenceOriginalSender.Match(r);
if (match.Success)
{
var senderParts = sender.Split('@', 2);
if (senderParts.Length != 2)
{
// Not a useful email address...
continue;
}
var headerSender = match.Groups[1].Value;
var headerParts = headerSender.Split('@', 2);
if (headerParts.Length != 2)
{
// Not a useful email address...
continue;
}
if (senderParts[1] != headerParts[1])
{
// Wrong domain...
continue;
}
if (!headerParts[0].StartsWith(senderParts[0] + "-"))
{
// Doesn't start with correct extension root
continue;
}
MemoryStream replacedStream = null;
try
{
replacedStream = new MemoryStream();
MimeReader reader = new MimeReader();
var structure = await reader.ReadStructureAsync(bodyStream, token);
// Copy the preamble
bodyStream.Seek(0, SeekOrigin.Begin);
BoundedStream pre = new BoundedStream(bodyStream, structure.HeaderSpan.Start);
await pre.CopyToAsync(replacedStream, token);
// Replace stuff in headers
bodyStream.Seek(structure.HeaderSpan.Start, SeekOrigin.Begin);
var headerBytes = await bodyStream.ReadExactlyAsync((int)structure.HeaderSpan.Length, token);
string header = Encoding.ASCII.GetString(headerBytes);
header = ReplaceFrom.Replace(header, $"$1<{headerSender}>");
header = ReplaceReferences.Replace(header,
m =>
{
if (String.IsNullOrWhiteSpace(m.Groups["pre"].Value) &&
String.IsNullOrWhiteSpace(m.Groups["post"].Value))
{
// We were the ONLY references header, just remove the whole thing
return("");
}
string space = "";
if (!String.IsNullOrEmpty(m.Groups["preSpace"].Value) &&
!String.IsNullOrEmpty(m.Groups["postSpace"].Value))
{
space = m.Groups["preSpace"].Value;
}
return($"References:{m.Groups["pre"].Value}{space}{m.Groups["post"].Value}");
});
using (StreamWriter writer = new StreamWriter(replacedStream, Encoding.ASCII, 1024, true))
{
writer.Write(header);
}
// Copy message content
bodyStream.Seek(structure.HeaderSpan.End, SeekOrigin.Begin);
await bodyStream.CopyToAsync(replacedStream, token);
bodyStream.Dispose();
replacedStream.Seek(0, SeekOrigin.Begin);
return(replacedStream, headerSender);
}
catch
{
replacedStream?.Dispose();
throw;
}
}
}
return(bodyStream, sender);
}
