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/*
* Copyright (C) 2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "HTTPHeaderField.h"
namespace WebCore {
namespace RFC7230 {
bool isTokenCharacter(UChar c)
{
return isASCIIAlpha(c) || isASCIIDigit(c)
|| c == '!' || c == '#' || c == '$'
|| c == '%' || c == '&' || c == '\''
|| c == '*' || c == '+' || c == '-'
|| c == '.' || c == '^' || c == '_'
|| c == '`' || c == '|' || c == '~';
}
bool isDelimiter(UChar c)
{
return c == '(' || c == ')' || c == ','
|| c == '/' || c == ':' || c == ';'
|| c == '<' || c == '=' || c == '>'
|| c == '?' || c == '@' || c == '['
|| c == '\\' || c == ']' || c == '{'
|| c == '}' || c == '"';
}
static bool isVisibleCharacter(UChar c)
{
return isTokenCharacter(c) || isDelimiter(c);
}
bool isWhitespace(UChar c)
{
return c == ' ' || c == '\t';
}
template<size_t min, size_t max>
static bool isInRange(UChar c)
{
return c >= min && c <= max;
}
static bool isOBSText(UChar c)
{
return isInRange<0x80, 0xFF>(c);
}
static bool isQuotedTextCharacter(UChar c)
{
return isWhitespace(c)
|| c == 0x21
|| isInRange<0x23, 0x5B>(c)
|| isInRange<0x5D, 0x7E>(c)
|| isOBSText(c);
}
bool isQuotedPairSecondOctet(UChar c)
{
return isWhitespace(c)
|| isVisibleCharacter(c)
|| isOBSText(c);
}
bool isCommentText(UChar c)
{
return isWhitespace(c)
|| isInRange<0x21, 0x27>(c)
|| isInRange<0x2A, 0x5B>(c)
|| isInRange<0x5D, 0x7E>(c)
|| isOBSText(c);
}
static bool isValidName(StringView name)
{
if (!name.length())
return false;
for (size_t i = 0; i < name.length(); ++i) {
if (!isTokenCharacter(name[i]))
return false;
}
return true;
}
static bool isValidValue(StringView value)
{
enum class State {
OptionalWhitespace,
Token,
QuotedString,
Comment,
};
State state = State::OptionalWhitespace;
size_t commentDepth = 0;
bool hadNonWhitespace = false;
for (size_t i = 0; i < value.length(); ++i) {
UChar c = value[i];
switch (state) {
case State::OptionalWhitespace:
if (isWhitespace(c))
continue;
hadNonWhitespace = true;
if (isTokenCharacter(c)) {
state = State::Token;
continue;
}
if (c == '"') {
state = State::QuotedString;
continue;
}
if (c == '(') {
ASSERT(!commentDepth);
++commentDepth;
state = State::Comment;
continue;
}
return false;
case State::Token:
if (isTokenCharacter(c))
continue;
state = State::OptionalWhitespace;
continue;
case State::QuotedString:
if (c == '"') {
state = State::OptionalWhitespace;
continue;
}
if (c == '\\') {
++i;
if (i == value.length())
return false;
if (!isQuotedPairSecondOctet(value[i]))
return false;
continue;
}
if (!isQuotedTextCharacter(c))
return false;
continue;
case State::Comment:
if (c == '(') {
++commentDepth;
continue;
}
if (c == ')') {
--commentDepth;
if (!commentDepth)
state = State::OptionalWhitespace;
continue;
}
if (c == '\\') {
++i;
if (i == value.length())
return false;
if (!isQuotedPairSecondOctet(value[i]))
return false;
continue;
}
if (!isCommentText(c))
return false;
continue;
}
}
switch (state) {
case State::OptionalWhitespace:
case State::Token:
return hadNonWhitespace;
case State::QuotedString:
case State::Comment:
// Unclosed comments or quotes are invalid values.
break;
}
return false;
}
} // namespace RFC7230
std::optional<HTTPHeaderField> HTTPHeaderField::create(String&& unparsedName, String&& unparsedValue)
{
StringView strippedName = StringView(unparsedName).stripLeadingAndTrailingMatchedCharacters(RFC7230::isWhitespace);
StringView strippedValue = StringView(unparsedValue).stripLeadingAndTrailingMatchedCharacters(RFC7230::isWhitespace);
if (!RFC7230::isValidName(strippedName) || !RFC7230::isValidValue(strippedValue))
return std::nullopt;
String name = strippedName.length() == unparsedName.length() ? WTFMove(unparsedName) : strippedName.toString();
String value = strippedValue.length() == unparsedValue.length() ? WTFMove(unparsedValue) : strippedValue.toString();
return {{ WTFMove(name), WTFMove(value) }};
}
}
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