public override void Add(string name, string value)
{
if (name == null)
{
throw new ArgumentNullException(nameof(name));
}
if (value == null)
{
throw new ArgumentNullException(nameof(value));
}
if (name == string.Empty)
{
throw new ArgumentException(string.Format(Strings.net_emptystringcall, nameof(name)), nameof(name));
}
if (value == string.Empty)
{
throw new ArgumentException(string.Format(Strings.net_emptystringcall, nameof(value)), nameof(name));
}
MailBnfHelper.ValidateHeaderName(name);
// normalize the case of well known headers
name = MailHeaderInfo.NormalizeCase(name);
MailHeaderID id = MailHeaderInfo.GetID(name);
value = value.Normalize(NormalizationForm.FormC);
if (id == MailHeaderID.ContentType && _part != null)
{
_part.ContentType.Set(value.ToLower(CultureInfo.InvariantCulture), this);
}
else if (id == MailHeaderID.ContentDisposition && _part is MimePart)
{
((MimePart)_part).ContentDisposition.Set(value.ToLower(CultureInfo.InvariantCulture), this);
}
else
{
InternalAdd(name, value);
}
}
private void WriteAndFold(string value, int charsAlreadyOnLine, bool allowUnicode)
{
int lastSpace = 0, startOfLine = 0;
for (int index = 0; index < value.Length; index++)
{
// When we find a FWS (CRLF) copy it as is.
if (MailBnfHelper.IsFWSAt(value, index)) // At the first char of "\r\n " or "\r\n\t"
{
index += 2; // Skip the FWS
_bufferBuilder.Append(value, startOfLine, index - startOfLine, allowUnicode);
// Reset for the next line
startOfLine = index;
lastSpace = index;
charsAlreadyOnLine = 0;
}
// When we pass the line length limit, and know where there was a space to fold at, fold there
else if (((index - startOfLine) > (_lineLength - charsAlreadyOnLine)) && lastSpace != startOfLine)
{
_bufferBuilder.Append(value, startOfLine, lastSpace - startOfLine, allowUnicode);
_bufferBuilder.Append(s_crlf);
startOfLine = lastSpace;
charsAlreadyOnLine = 0;
}
// Mark a foldable space. If we go over the line length limit, fold here.
else if (value[index] == MailBnfHelper.Space || value[index] == MailBnfHelper.Tab)
{
lastSpace = index;
}
}
// Write any remaining data to the buffer.
if (value.Length - startOfLine > 0)
{
_bufferBuilder.Append(value, startOfLine, value.Length - startOfLine, allowUnicode);
}
}
private void ParseValue()
{
int offset = 0;
try
{
// the disposition MUST be the first parameter in the string
_dispositionType = MailBnfHelper.ReadToken(_disposition, ref offset, null);
// disposition MUST not be empty
if (string.IsNullOrEmpty(_dispositionType))
{
throw new FormatException(Strings.MailHeaderFieldMalformedHeader);
}
// now we know that there are parameters so we must initialize or clear
// and parse
if (_parameters == null)
{
_parameters = new TrackingValidationObjectDictionary(s_validators);
}
else
{
_parameters.Clear();
}
while (MailBnfHelper.SkipCFWS(_disposition, ref offset))
{
// ensure that the separator charactor is present
if (_disposition[offset++] != ';')
{
throw new FormatException(string.Format(Strings.MailHeaderFieldInvalidCharacter, _disposition[offset - 1]));
}
// skip whitespace and see if there's anything left to parse or if we're done
if (!MailBnfHelper.SkipCFWS(_disposition, ref offset))
{
break;
}
string paramAttribute = MailBnfHelper.ReadParameterAttribute(_disposition, ref offset, null);
string paramValue;
// verify the next character after the parameter is correct
if (_disposition[offset++] != '=')
{
throw new FormatException(Strings.MailHeaderFieldMalformedHeader);
}
if (!MailBnfHelper.SkipCFWS(_disposition, ref offset))
{
// parameter was at end of string and has no value
// this is not valid
throw new FormatException(Strings.ContentDispositionInvalid);
}
paramValue = _disposition[offset] == '"' ?
MailBnfHelper.ReadQuotedString(_disposition, ref offset, null) :
MailBnfHelper.ReadToken(_disposition, ref offset, null);
// paramValue could potentially still be empty if it was a valid quoted string that
// contained no inner value. this is invalid
if (string.IsNullOrEmpty(paramAttribute) || string.IsNullOrEmpty(paramValue))
{
throw new FormatException(Strings.ContentDispositionInvalid);
}
// if validation is needed, the parameters dictionary will have a validator registered
// for the parameter that is being set so no additional formatting checks are needed here
Parameters.Add(paramAttribute, paramValue);
}
}
catch (FormatException exception)
{
// it's possible that something in MailBNFHelper could throw so ensure that we catch it and wrap it
// so that the exception has the correct text
throw new FormatException(Strings.ContentDispositionInvalid, exception);
}
_parameters.IsChanged = false;
}
// Helper methods.
private void ParseValue()
{
int offset = 0;
Exception exception = null;
try
{
_mediaType = MailBnfHelper.ReadToken(_type, ref offset, null);
if (_mediaType == null || _mediaType.Length == 0 || offset >= _type.Length || _type[offset++] != '/')
{
exception = new FormatException(Strings.ContentTypeInvalid);
}
if (exception == null)
{
_subType = MailBnfHelper.ReadToken(_type, ref offset, null);
if (_subType == null || _subType.Length == 0)
{
exception = new FormatException(Strings.ContentTypeInvalid);
}
}
if (exception == null)
{
while (MailBnfHelper.SkipCFWS(_type, ref offset))
{
if (_type[offset++] != ';')
{
exception = new FormatException(Strings.ContentTypeInvalid);
break;
}
if (!MailBnfHelper.SkipCFWS(_type, ref offset))
{
break;
}
string paramAttribute = MailBnfHelper.ReadParameterAttribute(_type, ref offset, null);
if (paramAttribute == null || paramAttribute.Length == 0)
{
exception = new FormatException(Strings.ContentTypeInvalid);
break;
}
string paramValue;
if (offset >= _type.Length || _type[offset++] != '=')
{
exception = new FormatException(Strings.ContentTypeInvalid);
break;
}
if (!MailBnfHelper.SkipCFWS(_type, ref offset))
{
exception = new FormatException(Strings.ContentTypeInvalid);
break;
}
paramValue = _type[offset] == '"' ?
MailBnfHelper.ReadQuotedString(_type, ref offset, null) :
MailBnfHelper.ReadToken(_type, ref offset, null);
if (paramValue == null)
{
exception = new FormatException(Strings.ContentTypeInvalid);
break;
}
_parameters.Add(paramAttribute, paramValue);
}
}
_parameters.IsChanged = false;
}
catch (FormatException)
{
throw new FormatException(Strings.ContentTypeInvalid);
}
if (exception != null)
{
throw new FormatException(Strings.ContentTypeInvalid);
}
}