private static string ReadUnfoldedLine(UnbufferedReader streamReader, Encoding customEncoding)
{
string line = streamReader.ReadLine(MAX_LINE_LENGTH, customEncoding);
if (!string.IsNullOrEmpty(line) && !streamReader.EndOfStream && streamReader.BaseStream.CanSeek)
{
/**
* RFC 822, 3.1.1. LONG HEADER FIELDS
* Each header field can be viewed as a single, logical line of
* ASCII characters, comprising a field-name and a field-body.
* For convenience, the field-body portion of this conceptual
* entity can be split into a multiple-line representation; this
* is called "folding". The general rule is that wherever there
* may be linear-white-space (NOT simply LWSP-chars), a CRLF
* immediately followed by AT LEAST one LWSP-char may instead be
* inserted.
* [...]
* The process of moving from this folded multiple-line
* representation of a header field to its single line represen-
* tation is called "unfolding". Unfolding is accomplished by
* regarding CRLF immediately followed by a LWSP-char as
* equivalent to the LWSP-char.
**/
long previousStreamPosition = streamReader.BaseStream.Position;
//check if next line is folded
string nextLine = streamReader.ReadLine(MAX_LINE_LENGTH, customEncoding);
while (!string.IsNullOrEmpty(nextLine) && Char.IsWhiteSpace(nextLine[0]))
{
//unfold the stream according to RFC 822
line = line.TrimEnd((char)0x0d, (char)0x0a) + nextLine.TrimStart();
previousStreamPosition = streamReader.BaseStream.Position;
nextLine = streamReader.ReadLine(MAX_LINE_LENGTH, customEncoding);
}
streamReader.BaseStream.Seek(previousStreamPosition, SeekOrigin.Begin);
}
return(line);
}
internal static void ReadHeaderAttributes(System.IO.Stream stream, long partStartIndex, out System.Collections.Specialized.NameValueCollection attributes)
{
stream.Position = partStartIndex;
UnbufferedReader streamReader = new UnbufferedReader(stream);
attributes = new System.Collections.Specialized.NameValueCollection();
string line = streamReader.ReadLine(200);
char[] headerParameterSeparators = { ';' };
//TODO: parse attribute headers properly, i.e. the stuff BEFORE ";"
while (line != null && line.Length > 0 && stream.Position < stream.Length)//read the part headers
{
string[] headerDataCollection = line.Split(headerParameterSeparators);
/**
* ==HEADER EXAMPLE 1 (SMTP)==
* Content-Type: application/octet-stream;
* .name="secretrendezvous.docx"
* Content-Transfer-Encoding: base64
* Content-Disposition: attachment;
* .filename="secretrendezvous.docx"
*
* ==HEADER EXAMPLE 2 (SMTP)==
* Content-Type: text/plain;
* .charset="iso-8859-1"
* Content-Transfer-Encoding: quoted-printable
*
* ==HEADER EXAMPLE 3 (HTTP POST)==
* Content-Disposition: form-data; name="check_type_diff"
*
* ==HEADER EXAMPLE 4 (HTTP POST)==
* Content-Disposition: form-data; name="image"; filename="C:\jx-3p.txt"
* Content-Type: text/plain
*
* ==Another tricky RFC 2047 example==
* Subject: =?UTF-8?Q?[Bokserkomania]_V=C3=A4nligen_moderera:_"Slipy_w_ksi=C4=99?= =?UTF-8?Q?=C5=BCyce"?=
*/
for (int i = 0; i < headerDataCollection.Length; i++)
{
try {
if (headerDataCollection[i].Contains("=\"") && headerDataCollection[i].Length > headerDataCollection[i].IndexOf('\"') + 1)
{
string parameterName = headerDataCollection[i].Substring(0, headerDataCollection[i].IndexOf('=')).Trim();
string parameterValue = headerDataCollection[i].Substring(headerDataCollection[i].IndexOf('\"') + 1, headerDataCollection[i].LastIndexOf('\"') - headerDataCollection[i].IndexOf('\"') - 1).Trim();
parameterValue = Rfc2047Parser.DecodeRfc2047Parts(parameterValue);
attributes.Add(parameterName, parameterValue);
}
else if (headerDataCollection[i].Contains(": "))
{
string parameterName = headerDataCollection[i].Substring(0, headerDataCollection[i].IndexOf(':')).Trim();
string parameterValue = headerDataCollection[i].Substring(headerDataCollection[i].IndexOf(':') + 1).Trim();
parameterValue = Rfc2047Parser.DecodeRfc2047Parts(parameterValue);
attributes.Add(parameterName, parameterValue);
}
}
catch (Exception e) {
//TODO log exception somewhere...
}
}
line = streamReader.ReadLine(200);
}
}
internal static void ReadHeaderAttributes(System.IO.Stream stream, long partStartIndex, out System.Collections.Specialized.NameValueCollection attributes, bool useOnlyASCII, Encoding customEncoding = null)
{
stream.Position = partStartIndex;
UnbufferedReader streamReader = new UnbufferedReader(stream);
attributes = new System.Collections.Specialized.NameValueCollection();
string line = streamReader.ReadLine(200, customEncoding);
char[] headerParameterSeparators = { ';' };
//TODO: parse attribute headers properly, i.e. the stuff BEFORE ";"
while (line != null && line.Length > 0 && stream.Position < stream.Length)//read the part headers
{
string[] headerDataCollection = line.Split(headerParameterSeparators);
bool skipNextLine = false;
/**
* ==HEADER EXAMPLE 1 (SMTP)==
* Content-Type: application/octet-stream;
* .name="secretrendezvous.docx"
* Content-Transfer-Encoding: base64
* Content-Disposition: attachment;
* .filename="secretrendezvous.docx"
*
* ==HEADER EXAMPLE 2 (SMTP, part inside multipart/mixed) - notice the missing quotation marks around the filename
* Content-Type: application/zip
* Content-Disposition: attachment; filename=00000459735.zip
* Content-Transfer-Encoding: base64
*
* ==HEADER EXAMPLE 3 (SMTP)==
* Content-Type: text/plain;
* .charset="iso-8859-1"
* Content-Transfer-Encoding: quoted-printable
*
* ==HEADER EXAMPLE 4 (HTTP POST)==
* Content-Disposition: form-data; name="check_type_diff"
*
* ==HEADER EXAMPLE 5 (HTTP POST)==
* Content-Disposition: form-data; name="image"; filename="C:\jx-3p.txt"
* Content-Type: text/plain
*
* ==Another tricky RFC 2047 example==
* Subject: =?UTF-8?Q?[Bokserkomania]_V=C3=A4nligen_moderera:_"Slipy_w_ksi=C4=99?= =?UTF-8?Q?=C5=BCyce"?=
*
* ==UTF8 encoded filename in HTTP POST, RFC 5987==
* Content-Disposition: form-data; name="Filedata"; filename="测试文档-Document for test.docx"
* ^^--where filename is UTF8 encoded
*
* ==SMTP email with Simplified Chinese in attribute values== prior to this we've seen: charset="gb2312"
* Content-Type: application/octet-stream;
* name="ºÎÀ½£¸ß¼¶ÃØÊé¡¢ÖúÀíºÍÐÐÕþ¹ÜÀíÕß¹¤×÷ЧÂÊÌáÉýѵÁ·Óª.zip"
* Content-Transfer-Encoding: base64
* Content-Disposition: attachment;
* filename="ºÎÀ½£¸ß¼¶ÃØÊé¡¢ÖúÀíºÍÐÐÕþ¹ÜÀíÕß¹¤×÷ЧÂÊÌáÉýѵÁ·Óª.zip"
*
* ==POP3 example with multi-line boundary in Content-Type==
* Content-Type: multipart/related; boundary="----MIME delimiter for [0x0d 0x0a]
* sendEmail-118138.401377113"
*
* ==SMTP example==
* Content-Type: text/plain; charset=utf-8; format=flowed
* content-transfer-encoding: quoted-printable
*
* ==SMTP example==
* Content-Type: application/octet-stream; name="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
* Content-Transfer-Encoding: base64
*
*/
for (int i = 0; i < headerDataCollection.Length; i++)
{
try {
if (headerDataCollection[i].Contains("=\"") && headerDataCollection[i].Length > headerDataCollection[i].IndexOf('\"') + 1)
{
string parameterName = headerDataCollection[i].Substring(0, headerDataCollection[i].IndexOf('=')).Trim();
int length = headerDataCollection[i].LastIndexOf('\"') - headerDataCollection[i].IndexOf('\"') - 1;
while (length < 0 && line != null && line.Length > 0 && stream.Position < stream.Length)
{
if (i == headerDataCollection.Length - 1)
{
//try reading the next line.
line = streamReader.ReadLine(200, customEncoding);
char quote = '\"';
if (line.Contains("" + quote) && line.IndexOf(quote) == line.LastIndexOf(quote) && line.EndsWith("" + quote))
{
headerDataCollection[i] += line;//append next line to value
length = headerDataCollection[i].LastIndexOf('\"') - headerDataCollection[i].IndexOf('\"') - 1;
}
else
{
skipNextLine = true;
break;
}
}
else
{
continue;//go to next parameter
}
}
string parameterValue = headerDataCollection[i].Substring(headerDataCollection[i].IndexOf('\"') + 1, length).Trim();
parameterValue = Rfc2047Parser.DecodeRfc2047Parts(parameterValue);
if (useOnlyASCII)
{
attributes.Add(Utils.StringManglerUtil.ConvertToAsciiIfUnicode(parameterName), Utils.StringManglerUtil.ConvertToAsciiIfUnicode(parameterValue));
}
else
{
attributes.Add(parameterName, parameterValue);
}
}
else if (headerDataCollection[i].Contains("name=") || headerDataCollection[i].Contains("charset=") || headerDataCollection[i].Contains("format="))
{
string parameterName = headerDataCollection[i].Substring(0, headerDataCollection[i].IndexOf('=')).Trim();
string parameterValue = headerDataCollection[i].Substring(headerDataCollection[i].IndexOf('=') + 1).Trim();
parameterValue = Rfc2047Parser.DecodeRfc2047Parts(parameterValue);
if (useOnlyASCII)
{
attributes.Add(Utils.StringManglerUtil.ConvertToAsciiIfUnicode(parameterName), Utils.StringManglerUtil.ConvertToAsciiIfUnicode(parameterValue));
}
else
{
attributes.Add(parameterName, parameterValue);
}
}
else if (headerDataCollection[i].Contains(": "))
{
string parameterName = headerDataCollection[i].Substring(0, headerDataCollection[i].IndexOf(':')).Trim();
string parameterValue = headerDataCollection[i].Substring(headerDataCollection[i].IndexOf(':') + 1).Trim();
parameterValue = Rfc2047Parser.DecodeRfc2047Parts(parameterValue);
if (useOnlyASCII)
{
attributes.Add(Utils.StringManglerUtil.ConvertToAsciiIfUnicode(parameterName), Utils.StringManglerUtil.ConvertToAsciiIfUnicode(parameterValue));
}
else
{
attributes.Add(parameterName, parameterValue);
}
}
}
catch (Exception e) {
SharedUtils.Logger.Log("Exception when parsing MIME data: " + e.Message, SharedUtils.Logger.EventLogEntryType.Error);
}
}
if (skipNextLine)
{
skipNextLine = false;
}
else
{
line = streamReader.ReadLine(200, customEncoding);
}
}
}
internal static void ReadHeaderAttributes(System.IO.Stream stream, long partStartIndex, out System.Collections.Specialized.NameValueCollection attributes, Encoding customEncoding = null)
{
stream.Position = partStartIndex;
UnbufferedReader streamReader = new UnbufferedReader(stream);
attributes = new System.Collections.Specialized.NameValueCollection();
string line = streamReader.ReadLine(200, customEncoding);
char[] headerParameterSeparators = { ';' };
//TODO: parse attribute headers properly, i.e. the stuff BEFORE ";"
while (line != null && line.Length > 0 && stream.Position < stream.Length)//read the part headers
{
string[] headerDataCollection = line.Split(headerParameterSeparators);
/**
* ==HEADER EXAMPLE 1 (SMTP)==
* Content-Type: application/octet-stream;
* .name="secretrendezvous.docx"
* Content-Transfer-Encoding: base64
* Content-Disposition: attachment;
* .filename="secretrendezvous.docx"
*
* ==HEADER EXAMPLE 2 (SMTP, part inside multipart/mixed) - notice the missing quotation marks around the filename
* Content-Type: application/zip
* Content-Disposition: attachment; filename=00000459735.zip
* Content-Transfer-Encoding: base64
*
* ==HEADER EXAMPLE 3 (SMTP)==
* Content-Type: text/plain;
* .charset="iso-8859-1"
* Content-Transfer-Encoding: quoted-printable
*
* ==HEADER EXAMPLE 4 (HTTP POST)==
* Content-Disposition: form-data; name="check_type_diff"
*
* ==HEADER EXAMPLE 5 (HTTP POST)==
* Content-Disposition: form-data; name="image"; filename="C:\jx-3p.txt"
* Content-Type: text/plain
*
* ==Another tricky RFC 2047 example==
* Subject: =?UTF-8?Q?[Bokserkomania]_V=C3=A4nligen_moderera:_"Slipy_w_ksi=C4=99?= =?UTF-8?Q?=C5=BCyce"?=
*
* ==UTF8 encoded filename in HTTP POST, RFC 5987==
* Content-Disposition: form-data; name="Filedata"; filename="测试文档-Document for test.docx"
* ^^--where filename is UTF8 encoded
*
* ==SMTP email with Simplified Chinese in attribute values== prior to this we've seen: charset="gb2312"
* Content-Type: application/octet-stream;
* name="ºÎÀ½£¸ß¼¶ÃØÊé¡¢ÖúÀíºÍÐÐÕþ¹ÜÀíÕß¹¤×÷ЧÂÊÌáÉýѵÁ·Óª.zip"
* Content-Transfer-Encoding: base64
* Content-Disposition: attachment;
* filename="ºÎÀ½£¸ß¼¶ÃØÊé¡¢ÖúÀíºÍÐÐÕþ¹ÜÀíÕß¹¤×÷ЧÂÊÌáÉýѵÁ·Óª.zip"
*
*
*/
for (int i = 0; i < headerDataCollection.Length; i++)
{
try {
if (headerDataCollection[i].Contains("=\"") && headerDataCollection[i].Length > headerDataCollection[i].IndexOf('\"') + 1)
{
string parameterName = headerDataCollection[i].Substring(0, headerDataCollection[i].IndexOf('=')).Trim();
string parameterValue = headerDataCollection[i].Substring(headerDataCollection[i].IndexOf('\"') + 1, headerDataCollection[i].LastIndexOf('\"') - headerDataCollection[i].IndexOf('\"') - 1).Trim();
parameterValue = Rfc2047Parser.DecodeRfc2047Parts(parameterValue);
attributes.Add(parameterName, parameterValue);
}
else if (headerDataCollection[i].Contains("name="))
{
string parameterName = headerDataCollection[i].Substring(0, headerDataCollection[i].IndexOf('=')).Trim();
string parameterValue = headerDataCollection[i].Substring(headerDataCollection[i].IndexOf('=') + 1).Trim();
parameterValue = Rfc2047Parser.DecodeRfc2047Parts(parameterValue);
attributes.Add(parameterName, parameterValue);
}
else if (headerDataCollection[i].Contains(": "))
{
string parameterName = headerDataCollection[i].Substring(0, headerDataCollection[i].IndexOf(':')).Trim();
string parameterValue = headerDataCollection[i].Substring(headerDataCollection[i].IndexOf(':') + 1).Trim();
parameterValue = Rfc2047Parser.DecodeRfc2047Parts(parameterValue);
attributes.Add(parameterName, parameterValue);
}
}
catch (Exception e) {
//TODO log exception somewhere...
}
}
line = streamReader.ReadLine(200, customEncoding);
}
}