Ejemplo n.º 1
0
        internal static void CheckValidToken(StringSegment value, string parameterName)
        {
            if (StringSegment.IsNullOrEmpty(value))
            {
                throw new ArgumentException("An empty string is not allowed.", parameterName);
            }

            if (ProtoRuleParser.GetTokenLength(value, 0) != value.Length)
            {
                throw new FormatException(string.Format(CultureInfo.InvariantCulture, "Invalid token '{0}.", value));
            }
        }
Ejemplo n.º 2
0
        private static int GetNameValueLength(StringSegment input, int startIndex, out NameValueHeaderValue parsedValue)
        {
            Contract.Requires(input != null);
            Contract.Requires(startIndex >= 0);

            parsedValue = null;

            if (StringSegment.IsNullOrEmpty(input) || (startIndex >= input.Length))
            {
                return(0);
            }

            // Parse the name, i.e. <name> in name/value string "<name>=<value>". Caller must remove
            // leading whitespaces.
            var nameLength = ProtoRuleParser.GetTokenLength(input, startIndex);

            if (nameLength == 0)
            {
                return(0);
            }

            var name    = input.Subsegment(startIndex, nameLength);
            var current = startIndex + nameLength;

            current = current + ProtoRuleParser.GetWhitespaceLength(input, current);

            // Parse the separator between name and value
            if ((current == input.Length) || (input[current] != '='))
            {
                // We only have a name and that's OK. Return.
                parsedValue       = new NameValueHeaderValue();
                parsedValue._name = name;
                current           = current + ProtoRuleParser.GetWhitespaceLength(input, current); // skip whitespaces
                return(current - startIndex);
            }

            current++; // skip delimiter.
            current = current + ProtoRuleParser.GetWhitespaceLength(input, current);

            // Parse the value, i.e. <value> in name/value string "<name>=<value>"
            int valueLength = GetValueLength(input, current);

            // Value after the '=' may be empty
            // Use parameterless ctor to avoid double-parsing of name and value, i.e. skip public ctor validation.
            parsedValue        = new NameValueHeaderValue();
            parsedValue._name  = name;
            parsedValue._value = input.Subsegment(current, valueLength);
            current            = current + valueLength;
            current            = current + ProtoRuleParser.GetWhitespaceLength(input, current); // skip whitespaces
            return(current - startIndex);
        }
Ejemplo n.º 3
0
        private static int GetMediaTypeExpressionLength(StringSegment input, int startIndex, out StringSegment mediaType)
        {
            Contract.Requires((input != null) && (input.Length > 0) && (startIndex < input.Length));

            // This method just parses the "type/subtype" string, it does not parse parameters.
            mediaType = null;

            // Parse the type, i.e. <type> in media type string "<type>/<subtype>; param1=value1; param2=value2"
            var typeLength = ProtoRuleParser.GetTokenLength(input, startIndex);

            if (typeLength == 0)
            {
                return(0);
            }

            var current = startIndex + typeLength;

            current = current + ProtoRuleParser.GetWhitespaceLength(input, current);

            // Parse the separator between type and subtype
            if ((current >= input.Length) || (input[current] != '/'))
            {
                return(0);
            }
            current++; // skip delimiter.
            current = current + ProtoRuleParser.GetWhitespaceLength(input, current);

            // Parse the subtype, i.e. <subtype> in media type string "<type>/<subtype>; param1=value1; param2=value2"
            var subtypeLength = ProtoRuleParser.GetTokenLength(input, current);

            if (subtypeLength == 0)
            {
                return(0);
            }

            // If there is no whitespace between <type> and <subtype> in <type>/<subtype> get the media type using
            // one Substring call. Otherwise get substrings for <type> and <subtype> and combine them.
            var mediaTypeLength = current + subtypeLength - startIndex;

            if (typeLength + subtypeLength + 1 == mediaTypeLength)
            {
                mediaType = input.Subsegment(startIndex, mediaTypeLength);
            }
            else
            {
                mediaType = input.Substring(startIndex, typeLength) + ForwardSlashCharacter + input.Substring(current, subtypeLength);
            }

            return(mediaTypeLength);
        }
Ejemplo n.º 4
0
        private static int GetRangeLength(StringSegment input, int startIndex, out RangeHeaderValue parsedValue)
        {
            Contract.Requires(startIndex >= 0);

            parsedValue = null;

            if (StringSegment.IsNullOrEmpty(input) || (startIndex >= input.Length))
            {
                return(0);
            }

            // Parse the unit string: <unit> in '<unit>=<from1>-<to1>, <from2>-<to2>'
            var unitLength = ProtoRuleParser.GetTokenLength(input, startIndex);

            if (unitLength == 0)
            {
                return(0);
            }

            RangeHeaderValue result = new RangeHeaderValue();

            result._unit = input.Subsegment(startIndex, unitLength);
            var current = startIndex + unitLength;

            current = current + ProtoRuleParser.GetWhitespaceLength(input, current);

            if ((current == input.Length) || (input[current] != '='))
            {
                return(0);
            }

            current++; // skip '=' separator
            current = current + ProtoRuleParser.GetWhitespaceLength(input, current);

            var rangesLength = RangeItemHeaderValue.GetRangeItemListLength(input, current, result.Ranges);

            if (rangesLength == 0)
            {
                return(0);
            }

            current = current + rangesLength;
            Contract.Assert(current == input.Length, "GetRangeItemListLength() should consume the whole string or fail.");

            parsedValue = result;
            return(current - startIndex);
        }
Ejemplo n.º 5
0
        private static int GetStringWithQualityLength(StringSegment input, int startIndex, out StringWithQualityHeaderValue parsedValue)
        {
            Contract.Requires(startIndex >= 0);

            parsedValue = null;

            if (StringSegment.IsNullOrEmpty(input) || (startIndex >= input.Length))
            {
                return(0);
            }

            // Parse the value string: <value> in '<value>; q=<quality>'
            var valueLength = ProtoRuleParser.GetTokenLength(input, startIndex);

            if (valueLength == 0)
            {
                return(0);
            }

            StringWithQualityHeaderValue result = new StringWithQualityHeaderValue();

            result._value = input.Subsegment(startIndex, valueLength);
            var current = startIndex + valueLength;

            current = current + ProtoRuleParser.GetWhitespaceLength(input, current);

            if ((current == input.Length) || (input[current] != ';'))
            {
                parsedValue = result;
                return(current - startIndex); // we have a valid token, but no quality.
            }

            current++; // skip ';' separator
            current = current + ProtoRuleParser.GetWhitespaceLength(input, current);

            // If we found a ';' separator, it must be followed by a quality information
            if (!TryReadQuality(input, result, ref current))
            {
                return(0);
            }

            parsedValue = result;
            return(current - startIndex);
        }
Ejemplo n.º 6
0
        /// <summary>
        /// Try to find a target header value among the set of given header values and parse it as a
        /// <see cref="TimeSpan"/>.
        /// </summary>
        /// <param name="headerValues">
        /// The <see cref="StringValues"/> containing the set of header values to search.
        /// </param>
        /// <param name="targetValue">
        /// The target header value to look for.
        /// </param>
        /// <param name="value">
        /// When this method returns, contains the parsed <see cref="TimeSpan"/>, if the parsing succeeded, or
        /// null if the parsing failed. The conversion fails if the <paramref name="targetValue"/> was not
        /// found or could not be parsed as a <see cref="TimeSpan"/>. This parameter is passed uninitialized;
        /// any value originally supplied in result will be overwritten.
        /// </param>
        /// <returns>
        /// <code>true</code> if <paramref name="targetValue"/> is found and successfully parsed; otherwise,
        /// <code>false</code>.
        /// </returns>
        // e.g. { "headerValue=10, targetHeaderValue=30" }
        public static bool TryParseSeconds(StringValues headerValues, string targetValue, out TimeSpan?value)
        {
            if (StringValues.IsNullOrEmpty(headerValues) || string.IsNullOrEmpty(targetValue))
            {
                value = null;
                return(false);
            }

            for (var i = 0; i < headerValues.Count; i++)
            {
                // Trim leading white space
                var current = ProtoRuleParser.GetWhitespaceLength(headerValues[i], 0);

                while (current < headerValues[i].Length)
                {
                    long seconds;
                    var  initial     = current;
                    var  tokenLength = ProtoRuleParser.GetTokenLength(headerValues[i], current);
                    if (tokenLength == targetValue.Length &&
                        string.Compare(headerValues[i], current, targetValue, 0, tokenLength, StringComparison.OrdinalIgnoreCase) == 0 &&
                        TryParseNonNegativeInt64FromHeaderValue(current + tokenLength, headerValues[i], out seconds))
                    {
                        // Token matches target value and seconds were parsed
                        value = TimeSpan.FromSeconds(seconds);
                        return(true);
                    }

                    current = AdvanceCacheDirectiveIndex(current + tokenLength, headerValues[i]);

                    // Ensure index was advanced
                    if (current <= initial)
                    {
                        Debug.Assert(false, $"Index '{nameof(current)}' not advanced, this is a bug.");
                        value = null;
                        return(false);
                    }
                }
            }
            value = null;
            return(false);
        }
Ejemplo n.º 7
0
        internal static int GetValueLength(StringSegment input, int startIndex)
        {
            Contract.Requires(input != null);

            if (startIndex >= input.Length)
            {
                return(0);
            }

            var valueLength = ProtoRuleParser.GetTokenLength(input, startIndex);

            if (valueLength == 0)
            {
                // A value can either be a token or a quoted string. Check if it is a quoted string.
                if (ProtoRuleParser.GetQuotedStringLength(input, startIndex, out valueLength) != ProtoParseResult.Parsed)
                {
                    // We have an invalid value. Reset the name and return.
                    return(0);
                }
            }
            return(valueLength);
        }
Ejemplo n.º 8
0
        /// <summary>
        /// Check if a target directive exists among the set of given cache control directives.
        /// </summary>
        /// <param name="cacheControlDirectives">
        /// The <see cref="StringValues"/> containing the set of cache control directives.
        /// </param>
        /// <param name="targetDirectives">
        /// The target cache control directives to look for.
        /// </param>
        /// <returns>
        /// <code>true</code> if <paramref name="targetDirectives"/> is contained in <paramref name="cacheControlDirectives"/>;
        /// otherwise, <code>false</code>.
        /// </returns>
        public static bool ContainsCacheDirective(StringValues cacheControlDirectives, string targetDirectives)
        {
            if (StringValues.IsNullOrEmpty(cacheControlDirectives) || string.IsNullOrEmpty(targetDirectives))
            {
                return(false);
            }

            for (var i = 0; i < cacheControlDirectives.Count; i++)
            {
                // Trim leading white space
                var current = ProtoRuleParser.GetWhitespaceLength(cacheControlDirectives[i], 0);

                while (current < cacheControlDirectives[i].Length)
                {
                    var initial = current;

                    var tokenLength = ProtoRuleParser.GetTokenLength(cacheControlDirectives[i], current);
                    if (tokenLength == targetDirectives.Length &&
                        string.Compare(cacheControlDirectives[i], current, targetDirectives, 0, tokenLength, StringComparison.OrdinalIgnoreCase) == 0)
                    {
                        // Token matches target value
                        return(true);
                    }

                    current = AdvanceCacheDirectiveIndex(current + tokenLength, cacheControlDirectives[i]);

                    // Ensure index was advanced
                    if (current <= initial)
                    {
                        Debug.Assert(false, $"Index '{nameof(current)}' not advanced, this is a bug.");
                        return(false);
                    }
                }
            }

            return(false);
        }
Ejemplo n.º 9
0
        // 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 = ProtoRuleParser.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 += ProtoRuleParser.GetWhitespaceLength(input, offset);

                //  cookie-av = expires-av / max-age-av / domain-av / path-av / secure-av / samesite-av / httponly-av / extension-av
                itemLength = ProtoRuleParser.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 (!ProtoRuleParser.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 = ProtoRuleParser.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 = "ProtoOnly"
                else if (StringSegment.Equals(token, ProtoOnlyToken, StringComparison.OrdinalIgnoreCase))
                {
                    result.ProtoOnly = 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);
        }