/// <summary>
/// Write the attachment to the file path.
/// </summary>
/// <param name="directoryPath">The directory path to write the file.</param>
/// <param name="fileName">The name of the file to write.</param>
/// <returns>True if the attachment was written else false.</returns>
public bool WriteAttachment(string directoryPath, string fileName)
{
try
{
// Write the current attachment
// to the specified file.
EmailMessageParse.WriteAttachment(_file,
directoryPath, fileName);
return(true);
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
/// <summary>
/// Decodes the attachment data from a mime encoded type.
/// </summary>
private void DecodeData()
{
// If the data is an attachemnt.
if (_contentDisposition != null)
{
// If the attachment is encoded as BASE-64
// then decode the data from base 64.
if ((_contentDisposition.Equals("attachment;")) &&
(_contentTransferEncoding.ToUpper().Equals("BASE64")))
{
// Convert the attachment data to a byte array
// from the base 64 encoding. Assign the decoded
// data to the byte array of the raw file.
_binaryData = Convert.FromBase64String(_data.Replace("\n", ""));
_file = _binaryData;
_decoded = true;
}
// If the attachment is encoded as QUOTED-PRINTABLE
// then decode the data from quoted printable.
else if ((_contentDisposition.Equals("attachment;")) &&
(_contentTransferEncoding.ToUpper().Equals("QUOTED-PRINTABLE")))
{
// Convert the attachment data to a byte array
// from the quoted printable encoding. Assign the decoded
// data to the byte array of the raw file.
string output = EmailMessageParse.FromQuotedPrintable(_data);
_file = Encoding.ASCII.GetBytes(output);
_decoded = true;
}
// If the attachment has been encoded with
// some other transfer encoding then assign
// the raw encoded data.
else if (_contentDisposition.Equals("attachment;"))
{
_file = Encoding.ASCII.GetBytes(_data);
_decoded = false;
}
}
}
/// <summary>
/// Parse each header type for each line in the email message.
/// </summary>
/// <param name="lines">The array of lines in the email message.</param>
/// <returns>The start of the message body.</returns>
private long ParseHeader(string[] lines)
{
// Get the total number of lines
// and set the body start count to
// zero.
int numberOfLines = lines.Length;
long bodyStart = 0;
// For each line in the email message
// parse all headers required.
for (int i = 0; i < numberOfLines; i++)
{
// Get the current email line.
string currentLine = lines[i].Replace("\n", "");
// Get the current line header type.
Nequeo.Net.Mail.MesssageHeaderType lineType = GetHeaderType(currentLine);
// Get each haeder type.
switch (lineType)
{
case Nequeo.Net.Mail.MesssageHeaderType.From:
// From email message.
_from = EmailMessageParse.From(currentLine);
break;
case Nequeo.Net.Mail.MesssageHeaderType.Subject:
// Subject of the message.
_subject = EmailMessageParse.Subject(currentLine);
break;
case Nequeo.Net.Mail.MesssageHeaderType.To:
// To email message.
_to = EmailMessageParse.To(currentLine);
break;
case Nequeo.Net.Mail.MesssageHeaderType.ReplyTo:
// Reply to email message.
_replyTo = EmailMessageParse.ReplyTo(currentLine);
break;
case Nequeo.Net.Mail.MesssageHeaderType.Date:
// Date received message.
_date = EmailMessageParse.Date(currentLine);
break;
case Nequeo.Net.Mail.MesssageHeaderType.Organization:
// The orginization that sent the message.
_organization = EmailMessageParse.Organization(currentLine);
break;
case Nequeo.Net.Mail.MesssageHeaderType.ReturnPath:
// The email address return path.
_returnPath = EmailMessageParse.ReturnPath(currentLine);
break;
case Nequeo.Net.Mail.MesssageHeaderType.Received:
// The computers that sent and recevied the message.
_received += EmailMessageParse.Received(currentLine);
break;
case Nequeo.Net.Mail.MesssageHeaderType.Cc:
// The carbon copy email address.
_cc = EmailMessageParse.Cc(currentLine);
break;
case Nequeo.Net.Mail.MesssageHeaderType.Bcc:
// The blind carbon copy email address.
_bcc = EmailMessageParse.Bcc(currentLine);
break;
case Nequeo.Net.Mail.MesssageHeaderType.Priority:
// The email message priority.
_priority = EmailMessageParse.Priority(currentLine);
break;
case Nequeo.Net.Mail.MesssageHeaderType.Importance:
// The importance of the message.
_importance = EmailMessageParse.Importance(currentLine);
break;
case Nequeo.Net.Mail.MesssageHeaderType.ContentType:
// The content type of the message
// that has been specified (text, html etc..).
_contentType = EmailMessageParse.ContentType(currentLine);
// Is multi part, that is are
// attachments included.
_isMultipart = EmailMessageParse.IsMultipart(_contentType);
// If multipart.
if (_isMultipart)
{
// Boundary has been found
// for the attachments.
if (_contentType.Substring(_contentType.Length - 1, 1).Equals(";"))
{
// Increament the line index by one
// move to the next line.
++i;
// Get the boundary data from the message.
_multipartBoundary = EmailMessageParse.MultipartBoundary(lines[i].Replace("\n", ""));
}
else
{
// Boundary definition is on same
// line as Content-Type.
_multipartBoundary = EmailMessageParse.MultipartBoundary(_contentType);
}
}
break;
case Nequeo.Net.Mail.MesssageHeaderType.EndOfHeader:
// The end of all message headers has been
// found so the next data is the body of the
// message increment the body start index.
bodyStart = i + 1;
break;
}
// If the body index is greater than
// zero then end of headers has been
// for and the body of the message
// has started, break out of the loop.
if (bodyStart > 0)
{
break;
}
}
// Return the start of the body.
return(bodyStart);
}
/// <summary>
/// Message body and attachment constructor.
/// </summary>
/// <param name="lines">The array of lines in the message.</param>
/// <param name="startOfBody">The start of the body data.</param>
/// <param name="multipartBoundary">The multipary boundary.</param>
/// <param name="mainContentType">The main content type.</param>
public MessageBody(string[] lines, long startOfBody, string multipartBoundary,
string mainContentType)
{
// Get the number of message lines.
long stopOfBody = lines.Length;
// If the multipart boudary is null then
// only a body part exists.
if (multipartBoundary == null)
{
// Create a new string builder.
StringBuilder sbText = new StringBuilder();
// For each line in the message
// append the body lines.
for (long i = startOfBody; i < stopOfBody; i++)
{
sbText.Append(lines[i].Replace("\n", "").Replace("\r", ""));
}
// Add a new body to the component
// list store.
_component.Add(new MessageAttachment(mainContentType, sbText.ToString()));
}
// Multipart boundary exists then a body and attachment
// exists in the message.
else
{
// Get the multipart boundary
// string in the message.
string boundary = multipartBoundary;
// Set as first component or body
// of the message to get.
bool firstComponent = true;
// Loop through whole of email message
// get the bodt all attachments.
for (long i = startOfBody; i < stopOfBody;)
{
bool boundaryFound = true;
string contentType = null;
string name = null;
string filename = null;
string contentTransferEncoding = null;
string contentDescription = null;
string contentDisposition = null;
string data = null;
// If the first component is to be added
// this is the body of a multipart message.
if (firstComponent)
{
boundaryFound = false;
firstComponent = false;
// For all the lines in the message.
while (i < stopOfBody)
{
// Get the current line in the message.
string line = lines[i].Replace("\n", "").Replace("\r", "");
// If the end of the body boundary
// has been found then exit the loop
// all body data has been found.
if (EmailMessageParse.GetContentMappingHeaderType(line, boundary)
== Nequeo.Net.Mail.MesssageContentMappingType.MultipartBoundaryFound)
{
boundaryFound = true;
++i;
break;
}
else
{
++i;
}
}
}
// Check to see whether multipart boundary
// was not found. This will indicate that
// the message data is corrupt.
if (!boundaryFound)
{
throw new Exception("Missing multipart boundary: " + boundary);
}
// Initalise the end of header indicator.
bool endOfHeader = false;
// Read all header information.
// For all other lines in the
// messsage.
while ((i < stopOfBody))
{
// Get the current line in the message.
string line = lines[i].Replace("\n", "").Replace("\r", "");
// Get the current content mapping type.
Nequeo.Net.Mail.MesssageContentMappingType lineType
= EmailMessageParse.GetContentMappingHeaderType(line, boundary);
// Get the mapping type.
switch (lineType)
{
case Nequeo.Net.Mail.MesssageContentMappingType.ContentType:
// Mapping type is content type header.
// Get the content type data.
contentType = EmailMessageParse.ContentType(line);
break;
case Nequeo.Net.Mail.MesssageContentMappingType.ContentTransferEncoding:
// Mapping type is content transfer encoding header.
// Get the content transfer encoding data.
contentTransferEncoding = EmailMessageParse.ContentTransferEncoding(line);
break;
case Nequeo.Net.Mail.MesssageContentMappingType.ContentDisposition:
// Mapping type is content disposition header.
// Get the content disposition data.
contentDisposition = EmailMessageParse.ContentDisposition(line);
break;
case Nequeo.Net.Mail.MesssageContentMappingType.ContentDescription:
// Mapping type is content description header.
// Get the content description data.
contentDescription = EmailMessageParse.ContentDescription(line);
break;
case Nequeo.Net.Mail.MesssageContentMappingType.EndOfHeader:
// End of header has been found.
endOfHeader = true;
break;
}
// Increment to the next line after
// find the content mapping type in
// the prevoius line.
++i;
// If end of header found then search
// for the next component starting point
// search for the next attachment. break
// out of the loop and end the process.
if (endOfHeader)
{
break;
}
else
{
// Read all header information.
// For all other lines in the
// messsage.
while (i < stopOfBody)
{
// If more lines to read for this line.
if (line.Substring(line.Length - 1, 1).Equals(";"))
{
// Get the current line in the message.
string nextLine = lines[i].Replace("\r", "").Replace("\n", "");
// Get the current attachment header type.
// interate through each attachment data.
switch (EmailMessageParse.GetAttachmenHeaderType(nextLine))
{
case Nequeo.Net.Mail.MesssageAttachmentType.Name:
// Attachment name header type.
// Get the attachment name in the message.
name = EmailMessageParse.Name(nextLine);
break;
case Nequeo.Net.Mail.MesssageAttachmentType.Filename:
// Attachment file nale header type.
// Get the attachment file name in the message.
filename = EmailMessageParse.Filename(nextLine);
break;
case Nequeo.Net.Mail.MesssageAttachmentType.EndOfHeader:
// End of header has been found.
endOfHeader = true;
break;
}
// If the end of the attachment
// data has not been found
if (!endOfHeader)
{
// Assign the current line to
// the next line
line = nextLine;
++i;
}
else
{
// End the loop.
break;
}
}
else
{
// End the loop.
break;
}
}
}
}
// Boundary found to false.
boundaryFound = false;
// Create a new string builder.
StringBuilder sbText = new StringBuilder();
// Initailise the emial composed indicator.
bool emailComposed = false;
// For each remaining line in
// the message store the body
// and the attachment.
while (i < stopOfBody)
{
// Get the current line in the message.
string line = lines[i].Replace("\n", "");
// If the end of the body boundary
// has been found then exit the loop
// all component data has been found.
if (EmailMessageParse.GetContentMappingHeaderType(line, boundary)
== Nequeo.Net.Mail.MesssageContentMappingType.MultipartBoundaryFound)
{
boundaryFound = true;
++i;
break;
}
// If the component is done then
// the email is composed, this
// component has been completed
// composed.
else if (EmailMessageParse.GetContentMappingHeaderType(line, boundary)
== Nequeo.Net.Mail.MesssageContentMappingType.ComponentDone)
{
emailComposed = true;
break;
}
// Add the current line of component
// data to the string builder.
// Move to the next line in the message.
sbText.Append(lines[i]);
++i;
}
// If data has been built
// then this is the component data
// that is body or attachment data.
if (sbText.Length > 0)
{
data = sbText.ToString();
}
// Add a new message body or attachment to the
// component list store.
_component.Add(new MessageAttachment(contentType, name, filename,
contentTransferEncoding, contentDescription, contentDisposition,
data));
// If all multiparts have been
// composed then exit break
// out of the loop.
if (emailComposed)
{
break;
}
}
}
}