internal void EncodeHeaders(HeaderCollection headers, bool allowUnicode)
{
if (_headersEncoding == null)
{
_headersEncoding = Encoding.GetEncoding(MimeBasePart.DefaultCharSet);
}
System.Diagnostics.Debug.Assert(_headersEncoding != null);
for (int i = 0; i < headers.Count; i++)
{
string headerName = headers.GetKey(i);
//certain well-known values are encoded by PrepareHeaders and PrepareEnvelopeHeaders
//so we can ignore them because either we encoded them already or there is no
//way for the user to have set them. If a header is well known and user settable then
//we should encode it here, otherwise we have already encoded it if necessary
if (!MailHeaderInfo.IsUserSettable(headerName))
{
continue;
}
string[] values = headers.GetValues(headerName);
string encodedValue = string.Empty;
for (int j = 0; j < values.Length; j++)
{
//encode if we need to
if (MimeBasePart.IsAscii(values[j], false) ||
(allowUnicode && MailHeaderInfo.AllowsUnicode(headerName) && // EAI
!MailBnfHelper.HasCROrLF(values[j])))
{
encodedValue = values[j];
}
else
{
encodedValue = MimeBasePart.EncodeHeaderValue(values[j],
_headersEncoding,
MimeBasePart.ShouldUseBase64Encoding(_headersEncoding) && !PreferQEncodeForHeaders,
headerName.Length);
}
//potentially there are multiple values per key
if (j == 0)
{
//if it's the first or only value, set will overwrite all the values assigned to that key
//which is fine since we have them stored in values[]
headers.Set(headerName, encodedValue);
}
else
{
//this is a subsequent key, so we must Add it since the first key will have overwritten the
//other values
headers.Add(headerName, encodedValue);
}
}
}
}
internal void PrepareEnvelopeHeaders(bool sendEnvelope, bool allowUnicode)
{
if (_headersEncoding == null)
{
_headersEncoding = Encoding.GetEncoding(MimeBasePart.DefaultCharSet);
}
EncodeHeaders(EnvelopeHeaders, allowUnicode);
// Only add X-Sender header if it wasn't already set by the user
string xSenderHeader = MailHeaderInfo.GetString(MailHeaderID.XSender);
if (!IsHeaderSet(xSenderHeader))
{
MailAddress sender = Sender ?? From;
EnvelopeHeaders.InternalSet(xSenderHeader, sender.Encode(xSenderHeader.Length, allowUnicode));
}
string headerName = MailHeaderInfo.GetString(MailHeaderID.XReceiver);
EnvelopeHeaders.Remove(headerName);
if (AutomaticallyBuildAndApplyRecipientHeaders)
{
foreach (MailAddress address in To)
{
EnvelopeHeaders.InternalAdd(headerName, address.Encode(headerName.Length, allowUnicode));
}
foreach (MailAddress address in CC)
{
EnvelopeHeaders.InternalAdd(headerName, address.Encode(headerName.Length, allowUnicode));
}
foreach (MailAddress address in Bcc)
{
EnvelopeHeaders.InternalAdd(headerName, address.Encode(headerName.Length, allowUnicode));
}
}
}
internal void PrepareHeaders(bool sendEnvelope, bool allowUnicode)
{
string headerName;
if (_headersEncoding == null)
{
_headersEncoding = Encoding.GetEncoding(MimeBasePart.DefaultCharSet);
}
//ContentType is written directly to the stream so remove potential user duplicate
Headers.Remove(MailHeaderInfo.GetString(MailHeaderID.ContentType));
Headers[MailHeaderInfo.GetString(MailHeaderID.MimeVersion)] = "1.0";
// add sender to headers first so that it is written first to allow the IIS smtp svc to
// send MAIL FROM with the sender if both sender and from are present
headerName = MailHeaderInfo.GetString(MailHeaderID.Sender);
if (Sender != null && EmitSenderHeader)
{
Headers.InternalAdd(headerName, Sender.Encode(headerName.Length, allowUnicode));
}
else
{
Headers.Remove(headerName);
}
headerName = MailHeaderInfo.GetString(MailHeaderID.From);
Headers.InternalAdd(headerName, From.Encode(headerName.Length, allowUnicode));
if (AutomaticallyBuildAndApplyRecipientHeaders)
{
headerName = MailHeaderInfo.GetString(MailHeaderID.To);
if (To.Count > 0)
{
Headers.InternalAdd(headerName, To.Encode(headerName.Length, allowUnicode));
}
else
{
Headers.Remove(headerName);
}
headerName = MailHeaderInfo.GetString(MailHeaderID.Cc);
if (CC.Count > 0)
{
Headers.InternalAdd(headerName, CC.Encode(headerName.Length, allowUnicode));
}
else
{
Headers.Remove(headerName);
}
}
headerName = MailHeaderInfo.GetString(MailHeaderID.ReplyTo);
if (ReplyTo != null)
{
Headers.InternalAdd(headerName, ReplyTo.Encode(headerName.Length, allowUnicode));
}
else if (ReplyToList.Count > 0)
{
Headers.InternalAdd(headerName, ReplyToList.Encode(headerName.Length, allowUnicode));
}
else
{
Headers.Remove(headerName);
}
if (!DisplayBccHeader)
{
Headers.Remove(MailHeaderInfo.GetString(MailHeaderID.Bcc));
}
if (AutomaticallyBuildAndApplyRecipientHeaders && DisplayBccHeader && Bcc.Count > 0)
{
Headers.Remove(MailHeaderInfo.GetString(MailHeaderID.Bcc));
headerName = MailHeaderInfo.GetString(MailHeaderID.Bcc);
Headers.InternalAdd(headerName, Bcc.Encode(headerName.Length, allowUnicode));
}
if (_priority == MailPriority.High)
{
Headers[MailHeaderInfo.GetString(MailHeaderID.XPriority)] = "1";
Headers[MailHeaderInfo.GetString(MailHeaderID.Priority)] = "urgent";
Headers[MailHeaderInfo.GetString(MailHeaderID.Importance)] = "high";
}
else if (_priority == MailPriority.Low)
{
Headers[MailHeaderInfo.GetString(MailHeaderID.XPriority)] = "5";
Headers[MailHeaderInfo.GetString(MailHeaderID.Priority)] = "non-urgent";
Headers[MailHeaderInfo.GetString(MailHeaderID.Importance)] = "low";
}
//if the priority was never set, allow the app to set the headers directly.
else if (((int)_priority) != -1)
{
Headers.Remove(MailHeaderInfo.GetString(MailHeaderID.XPriority));
Headers.Remove(MailHeaderInfo.GetString(MailHeaderID.Priority));
Headers.Remove(MailHeaderInfo.GetString(MailHeaderID.Importance));
}
Headers.InternalAdd(MailHeaderInfo.GetString(MailHeaderID.Date),
MailBnfHelper.GetDateTimeString(Date, null));
headerName = MailHeaderInfo.GetString(MailHeaderID.Subject);
if (!string.IsNullOrEmpty(_subject))
{
if (allowUnicode)
{
Headers.InternalAdd(headerName, _subject);
}
else
{
Headers.InternalAdd(headerName,
MimeBasePart.EncodeHeaderValue(_subject, _subjectEncoding,
MimeBasePart.ShouldUseBase64Encoding(_subjectEncoding) && !PreferQEncodeForHeaders,
headerName.Length));
}
}
else
{
Headers.Remove(headerName);
}
EncodeHeaders(_headers, allowUnicode);
}