private static void CheckValueFormat(string?value)
{
// Either value is null/empty or a valid token/quoted string https://tools.ietf.org/html/rfc7230#section-3.2.6
if (string.IsNullOrEmpty(value))
{
return;
}
// Trailing/leading space are not allowed
if (value.StartsWith(' ') || value.StartsWith('\t') || value.EndsWith(' ') || value.EndsWith('\t'))
{
ThrowFormatException(value);
}
if (value[0] == '"')
{
HttpParseResult parseResult = HttpRuleParser.GetQuotedStringLength(value, 0, out int valueLength);
if (parseResult != HttpParseResult.Parsed || valueLength != value.Length)
{
ThrowFormatException(value);
}
}
else if (HttpRuleParser.ContainsNewLine(value))
{
ThrowFormatException(value);
}
/// <summary>
/// Allows for arbitrary header values without validation (aside from newline, which is always invalid in a header value).
/// </summary>
private static int ParseWithoutValidation(string value, int startIndex, out object?parsedValue)
{
if (HttpRuleParser.ContainsNewLine(value, startIndex))
{
parsedValue = null;
return(0);
}
string result = value.Substring(startIndex);
parsedValue = result;
return(result.Length);
}