private static unsafe bool TryParseNonNegativeInt64FromHeaderValue(int startIndex, string headerValue, out long result)
{
// Trim leading whitespace
startIndex += HttpRuleParser.GetWhitespaceLength(headerValue, startIndex);
// Match and skip '=', it also can't be the last character in the headerValue
if (startIndex >= headerValue.Length - 1 || headerValue[startIndex] != '=')
{
result = 0;
return(false);
}
startIndex++;
// Trim trailing whitespace
startIndex += HttpRuleParser.GetWhitespaceLength(headerValue, startIndex);
// Try parse the number
if (TryParseNonNegativeInt64(new StringSegment(headerValue, startIndex, HttpRuleParser.GetNumberLength(headerValue, startIndex, false)), out result))
{
return(true);
}
result = 0;
return(false);
}
private static bool TryGetRangeLength(StringSegment input, ref int current, out int fromLength, out int toStartIndex, out int toLength)
{
fromLength = 0;
toStartIndex = 0;
toLength = 0;
// Check if we have a value like 'bytes */133'. If yes, skip the range part and continue parsing the
// length separator '/'.
if (input[current] == '*')
{
current++;
}
else
{
// Parse first range value: <from> in '<unit> <from>-<to>/<length>'
fromLength = HttpRuleParser.GetNumberLength(input, current, false);
if ((fromLength == 0) || (fromLength > HttpRuleParser.MaxInt64Digits))
{
return(false);
}
current = current + fromLength;
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
// After the first value, the '-' character must follow.
if ((current == input.Length) || (input[current] != '-'))
{
// We need a '-' character otherwise this can't be a valid range.
return(false);
}
current++; // skip the '-' character
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
if (current == input.Length)
{
return(false);
}
// Parse second range value: <to> in '<unit> <from>-<to>/<length>'
toStartIndex = current;
toLength = HttpRuleParser.GetNumberLength(input, current, false);
if ((toLength == 0) || (toLength > HttpRuleParser.MaxInt64Digits))
{
return(false);
}
current = current + toLength;
}
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
return(true);
}
private static bool TryGetLengthLength(StringSegment input, ref int current, out int lengthLength)
{
lengthLength = 0;
if (input[current] == '*')
{
current++;
}
else
{
// Parse length value: <length> in '<unit> <from>-<to>/<length>'
lengthLength = HttpRuleParser.GetNumberLength(input, current, false);
if ((lengthLength == 0) || (lengthLength > HttpRuleParser.MaxInt64Digits))
{
return(false);
}
current = current + lengthLength;
}
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
return(true);
}
// name=value; expires=Sun, 06 Nov 1994 08:49:37 GMT; max-age=86400; domain=domain1; path=path1; secure; samesite={Strict|Lax|None}; httponly
private static int GetSetCookieLength(StringSegment input, int startIndex, out SetCookieHeaderValue parsedValue)
{
Contract.Requires(startIndex >= 0);
var offset = startIndex;
parsedValue = null;
if (StringSegment.IsNullOrEmpty(input) || (offset >= input.Length))
{
return(0);
}
var result = new SetCookieHeaderValue();
// The caller should have already consumed any leading whitespace, commas, etc..
// Name=value;
// Name
var itemLength = HttpRuleParser.GetTokenLength(input, offset);
if (itemLength == 0)
{
return(0);
}
result._name = input.Subsegment(offset, itemLength);
offset += itemLength;
// = (no spaces)
if (!ReadEqualsSign(input, ref offset))
{
return(0);
}
// value or "quoted value"
// The value may be empty
result._value = CookieHeaderValue.GetCookieValue(input, ref offset);
// *(';' SP cookie-av)
while (offset < input.Length)
{
if (input[offset] == ',')
{
// Divider between headers
break;
}
if (input[offset] != ';')
{
// Expecting a ';' between parameters
return(0);
}
offset++;
offset += HttpRuleParser.GetWhitespaceLength(input, offset);
// cookie-av = expires-av / max-age-av / domain-av / path-av / secure-av / samesite-av / httponly-av / extension-av
itemLength = HttpRuleParser.GetTokenLength(input, offset);
if (itemLength == 0)
{
// Trailing ';' or leading into garbage. Let the next parser fail.
break;
}
var token = input.Subsegment(offset, itemLength);
offset += itemLength;
// expires-av = "Expires=" sane-cookie-date
if (StringSegment.Equals(token, ExpiresToken, StringComparison.OrdinalIgnoreCase))
{
// = (no spaces)
if (!ReadEqualsSign(input, ref offset))
{
return(0);
}
var dateString = ReadToSemicolonOrEnd(input, ref offset);
DateTimeOffset expirationDate;
if (!HttpRuleParser.TryStringToDate(dateString, out expirationDate))
{
// Invalid expiration date, abort
return(0);
}
result.Expires = expirationDate;
}
// max-age-av = "Max-Age=" non-zero-digit *DIGIT
else if (StringSegment.Equals(token, MaxAgeToken, StringComparison.OrdinalIgnoreCase))
{
// = (no spaces)
if (!ReadEqualsSign(input, ref offset))
{
return(0);
}
itemLength = HttpRuleParser.GetNumberLength(input, offset, allowDecimal: false);
if (itemLength == 0)
{
return(0);
}
var numberString = input.Subsegment(offset, itemLength);
long maxAge;
if (!HeaderUtilities.TryParseNonNegativeInt64(numberString, out maxAge))
{
// Invalid expiration date, abort
return(0);
}
result.MaxAge = TimeSpan.FromSeconds(maxAge);
offset += itemLength;
}
// domain-av = "Domain=" domain-value
// domain-value = <subdomain> ; defined in [RFC1034], Section 3.5, as enhanced by [RFC1123], Section 2.1
else if (StringSegment.Equals(token, DomainToken, StringComparison.OrdinalIgnoreCase))
{
// = (no spaces)
if (!ReadEqualsSign(input, ref offset))
{
return(0);
}
// We don't do any detailed validation on the domain.
result.Domain = ReadToSemicolonOrEnd(input, ref offset);
}
// path-av = "Path=" path-value
// path-value = <any CHAR except CTLs or ";">
else if (StringSegment.Equals(token, PathToken, StringComparison.OrdinalIgnoreCase))
{
// = (no spaces)
if (!ReadEqualsSign(input, ref offset))
{
return(0);
}
// We don't do any detailed validation on the path.
result.Path = ReadToSemicolonOrEnd(input, ref offset);
}
// secure-av = "Secure"
else if (StringSegment.Equals(token, SecureToken, StringComparison.OrdinalIgnoreCase))
{
result.Secure = true;
}
// samesite-av = "SameSite=" samesite-value
// samesite-value = "Strict" / "Lax" / "None"
else if (StringSegment.Equals(token, SameSiteToken, StringComparison.OrdinalIgnoreCase))
{
if (!ReadEqualsSign(input, ref offset))
{
result.SameSite = SuppressSameSiteNone ? SameSiteMode.Strict : SameSiteMode.Unspecified;
}
else
{
var enforcementMode = ReadToSemicolonOrEnd(input, ref offset);
if (StringSegment.Equals(enforcementMode, SameSiteStrictToken, StringComparison.OrdinalIgnoreCase))
{
result.SameSite = SameSiteMode.Strict;
}
else if (StringSegment.Equals(enforcementMode, SameSiteLaxToken, StringComparison.OrdinalIgnoreCase))
{
result.SameSite = SameSiteMode.Lax;
}
else if (!SuppressSameSiteNone &&
StringSegment.Equals(enforcementMode, SameSiteNoneToken, StringComparison.OrdinalIgnoreCase))
{
result.SameSite = SameSiteMode.None;
}
else
{
result.SameSite = SuppressSameSiteNone ? SameSiteMode.Strict : SameSiteMode.Unspecified;
}
}
}
// httponly-av = "HttpOnly"
else if (StringSegment.Equals(token, HttpOnlyToken, StringComparison.OrdinalIgnoreCase))
{
result.HttpOnly = true;
}
// extension-av = <any CHAR except CTLs or ";">
else
{
// TODO: skiping it for now to avoid parsing failure? Store it in a list?
// = (no spaces)
if (!ReadEqualsSign(input, ref offset))
{
return(0);
}
ReadToSemicolonOrEnd(input, ref offset);
}
}
parsedValue = result;
return(offset - startIndex);
}
internal static int GetRangeItemLength(StringSegment input, int startIndex, out RangeItemHeaderValue parsedValue)
{
Contract.Requires(startIndex >= 0);
// This parser parses number ranges: e.g. '1-2', '1-', '-2'.
parsedValue = null;
if (StringSegment.IsNullOrEmpty(input) || (startIndex >= input.Length))
{
return(0);
}
// Caller must remove leading whitespaces. If not, we'll return 0.
var current = startIndex;
// Try parse the first value of a value pair.
var fromStartIndex = current;
var fromLength = HttpRuleParser.GetNumberLength(input, current, false);
if (fromLength > HttpRuleParser.MaxInt64Digits)
{
return(0);
}
current = current + fromLength;
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
// After the first value, the '-' character must follow.
if ((current == input.Length) || (input[current] != '-'))
{
// We need a '-' character otherwise this can't be a valid range.
return(0);
}
current++; // skip the '-' character
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
var toStartIndex = current;
var toLength = 0;
// If we didn't reach the end of the string, try parse the second value of the range.
if (current < input.Length)
{
toLength = HttpRuleParser.GetNumberLength(input, current, false);
if (toLength > HttpRuleParser.MaxInt64Digits)
{
return(0);
}
current = current + toLength;
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
}
if ((fromLength == 0) && (toLength == 0))
{
return(0); // At least one value must be provided in order to be a valid range.
}
// Try convert first value to int64
long from = 0;
if ((fromLength > 0) && !HeaderUtilities.TryParseNonNegativeInt64(input.Subsegment(fromStartIndex, fromLength), out from))
{
return(0);
}
// Try convert second value to int64
long to = 0;
if ((toLength > 0) && !HeaderUtilities.TryParseNonNegativeInt64(input.Subsegment(toStartIndex, toLength), out to))
{
return(0);
}
// 'from' must not be greater than 'to'
if ((fromLength > 0) && (toLength > 0) && (from > to))
{
return(0);
}
parsedValue = new RangeItemHeaderValue((fromLength == 0 ? (long?)null : (long?)from),
(toLength == 0 ? (long?)null : (long?)to));
return(current - startIndex);
}
