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 TryReadQuality(string input, StringWithQualityHeaderValue result, ref int index) { var current = index; // See if we have a quality value by looking for "q" if ((current == input.Length) || ((input[current] != 'q') && (input[current] != 'Q'))) { return(false); } current++; // skip 'q' identifier current = current + HttpRuleParser.GetWhitespaceLength(input, current); // If we found "q" it must be followed by "=" if ((current == input.Length) || (input[current] != '=')) { return(false); } current++; // skip '=' separator current = current + HttpRuleParser.GetWhitespaceLength(input, current); if (current == input.Length) { return(false); } int qualityLength = HttpRuleParser.GetNumberLength(input, current, true); if (qualityLength == 0) { return(false); } double quality; if (!double.TryParse(input.Substring(current, qualityLength), NumberStyles.AllowDecimalPoint, NumberFormatInfo.InvariantInfo, out quality)) { return(false); } if ((quality < 0) || (quality > 1)) { return(false); } result._quality = quality; current = current + qualityLength; current = current + HttpRuleParser.GetWhitespaceLength(input, current); index = 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}; 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=" samesite-value // samesite-value = "Strict" / "Lax" else if (StringSegment.Equals(token, SameSiteToken, StringComparison.OrdinalIgnoreCase)) { if (!ReadEqualsSign(input, ref offset)) { result.SameSite = SameSiteMode.Strict; } else { var enforcementMode = ReadToSemicolonOrEnd(input, ref offset); if (StringSegment.Equals(enforcementMode, SameSiteLaxToken, StringComparison.OrdinalIgnoreCase)) { result.SameSite = SameSiteMode.Lax; } else { result.SameSite = SameSiteMode.Strict; } } } // httponly-av = "HttpOnly" else if (StringSegment.Equals(token, HttpOnlyToken, StringComparison.OrdinalIgnoreCase)) { result.HttpOnly = true; } // extension-av = <any CHAR except CTLs or ";"> else { // TODO: skip it? Store it in a list? } } 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); }