internal static int GetViaLength(string?input, int startIndex, out object?parsedValue)
{
Debug.Assert(startIndex >= 0);
parsedValue = null;
if (string.IsNullOrEmpty(input) || (startIndex >= input.Length))
{
return(0);
}
// Read <protocolName> and <protocolVersion> in '[<protocolName>/]<protocolVersion> <receivedBy> [<comment>]'
int current = GetProtocolEndIndex(input, startIndex, out string?protocolName, out string?protocolVersion);
// If we reached the end of the string after reading protocolName/Version we return (we expect at least
// <receivedBy> to follow). If reading protocolName/Version read 0 bytes, we return.
if ((current == startIndex) || (current == input.Length))
{
return(0);
}
Debug.Assert(protocolVersion != null);
// Read <receivedBy> in '[<protocolName>/]<protocolVersion> <receivedBy> [<comment>]'
int receivedByLength = HttpRuleParser.GetHostLength(input, current, true, out string?receivedBy);
if (receivedByLength == 0)
{
return(0);
}
current = current + receivedByLength;
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
string?comment = null;
if ((current < input.Length) && (input[current] == '('))
{
// We have a <comment> in '[<protocolName>/]<protocolVersion> <receivedBy> [<comment>]'
int commentLength = 0;
if (HttpRuleParser.GetCommentLength(input, current, out commentLength) != HttpParseResult.Parsed)
{
return(0); // We found a '(' character but it wasn't a valid comment. Abort.
}
comment = input.Substring(current, commentLength);
current = current + commentLength;
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
}
ViaHeaderValue result = new ViaHeaderValue();
result._protocolVersion = protocolVersion;
result._protocolName = protocolName;
result._receivedBy = receivedBy !;
result._comment = comment;
parsedValue = result;
return(current - startIndex);
}
private static bool TryReadAgent(string input, ref int current, [NotNullWhen(true)] out string?agent)
{
agent = null;
int agentLength = HttpRuleParser.GetHostLength(input, current, true);
if (agentLength == 0)
{
return(false);
}
agent = input.Substring(current, agentLength);
current = current + agentLength;
int whitespaceLength = HttpRuleParser.GetWhitespaceLength(input, current);
current = current + whitespaceLength;
// At least one whitespace required after <agent>. Also make sure we have characters left for <text>
if ((whitespaceLength == 0) || (current == input.Length))
{
return(false);
}
return(true);
}
private static int ParseHost(string value, int startIndex, out object?parsedValue)
{
int hostLength = HttpRuleParser.GetHostLength(value, startIndex, false, out string?host);
parsedValue = host;
return(hostLength);
}
private static void AssertGetHostLength(string input, int startIndex, int expectedLength, bool allowToken,
string expectedResult)
{
string result = null;
Assert.Equal(expectedLength, HttpRuleParser.GetHostLength(input, startIndex, allowToken, out result));
Assert.Equal(expectedResult, result);
}
private static void AssertGetHostLength(string input, int startIndex, int expectedLength, bool allowToken,
string expectedResult)
{
int length = HttpRuleParser.GetHostLength(input, startIndex, allowToken);
Assert.Equal(expectedLength, length);
if (length != 0)
{
string result = input.Substring(startIndex, length);
Assert.Equal(expectedResult, result);
}
}
private static void CheckAgent(string agent)
{
if (string.IsNullOrEmpty(agent))
{
throw new ArgumentException(SR.net_http_argument_empty_string, nameof(agent));
}
// 'receivedBy' can either be a host or a token. Since a token is a valid host, we only verify if the value
// is a valid host.
if (HttpRuleParser.GetHostLength(agent, 0, true, out string?host) != agent.Length)
{
throw new FormatException(SR.Format(System.Globalization.CultureInfo.InvariantCulture, SR.net_http_headers_invalid_value, agent));
}
}
private static void CheckReceivedBy(string receivedBy)
{
if (string.IsNullOrEmpty(receivedBy))
{
throw new ArgumentException(SR.net_http_argument_empty_string, "receivedBy");
}
// 'receivedBy' can either be a host or a token. Since a token is a valid host, we only verify if the value
// is a valid host.
string host = null;
if (HttpRuleParser.GetHostLength(receivedBy, 0, true, out host) != receivedBy.Length)
{
throw new FormatException(string.Format(System.Globalization.CultureInfo.InvariantCulture, SR.net_http_headers_invalid_value, receivedBy));
}
}
private static void CheckAgent(string agent)
{
if (string.IsNullOrEmpty(agent))
{
throw new ArgumentException("The value cannot be null or empty.", "agent");
}
// 'receivedBy' can either be a host or a token. Since a token is a valid host, we only verify if the value
// is a valid host.
string host = null;
if (HttpRuleParser.GetHostLength(agent, 0, true, out host) != agent.Length)
{
throw new FormatException(string.Format("The format of value '{0}' is invalid.", agent));
}
}
private static void CheckReceivedBy(string receivedBy)
{
if (string.IsNullOrEmpty(receivedBy))
{
throw new ArgumentException("The value cannot be null or empty.", nameof(receivedBy));
}
// 'receivedBy' can either be a host or a token. Since a token is a valid host, we only verify if the value
// is a valid host.
string host = null;
if (HttpRuleParser.GetHostLength(receivedBy, 0, true, out host) != receivedBy.Length)
{
throw new FormatException(string.Format(System.Globalization.CultureInfo.InvariantCulture, "The format of value '{0}' is invalid.", receivedBy));
}
}
