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/*
* Copyright (C) 2005-2019 Apple Inc. All rights reserved.
* Copyright (C) 2018 Igalia S.L.
*
* 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 "URLHelpers.h"
#include "URLParser.h"
#include <mutex>
#include <unicode/uidna.h>
#include <unicode/uscript.h>
#include <wtf/Optional.h>
#include <wtf/text/WTFString.h>
namespace WTF {
namespace URLHelpers {
// Needs to be big enough to hold an IDN-encoded name.
// For host names bigger than this, we won't do IDN encoding, which is almost certainly OK.
const unsigned hostNameBufferLength = 2048;
const unsigned urlBytesBufferLength = 2048;
static uint32_t IDNScriptWhiteList[(USCRIPT_CODE_LIMIT + 31) / 32];
#if !PLATFORM(COCOA)
// Cocoa has an implementation that uses a whitelist in /Library or ~/Library,
// if it exists.
void loadIDNScriptWhiteList()
{
static std::once_flag flag;
std::call_once(flag, initializeDefaultIDNScriptWhiteList);
}
#endif // !PLATFORM(COCOA)
static bool isArmenianLookalikeCharacter(UChar32 codePoint)
{
return codePoint == 0x0548 || codePoint == 0x054D || codePoint == 0x0578 || codePoint == 0x057D;
}
static bool isArmenianScriptCharacter(UChar32 codePoint)
{
UErrorCode error = U_ZERO_ERROR;
UScriptCode script = uscript_getScript(codePoint, &error);
if (error != U_ZERO_ERROR) {
LOG_ERROR("got ICU error while trying to look at scripts: %d", error);
return false;
}
return script == USCRIPT_ARMENIAN;
}
template<typename CharacterType> inline bool isASCIIDigitOrValidHostCharacter(CharacterType charCode)
{
if (!isASCIIDigitOrPunctuation(charCode))
return false;
// Things the URL Parser rejects:
switch (charCode) {
case '#':
case '%':
case '/':
case ':':
case '?':
case '@':
case '[':
case '\\':
case ']':
return false;
default:
return true;
}
}
static bool isLookalikeCharacter(const Optional<UChar32>& previousCodePoint, UChar32 charCode)
{
// This function treats the following as unsafe, lookalike characters:
// any non-printable character, any character considered as whitespace,
// any ignorable character, and emoji characters related to locks.
// We also considered the characters in Mozilla's blacklist <http://kb.mozillazine.org/Network.IDN.blacklist_chars>.
// Some of the characters here will never appear once ICU has encoded.
// For example, ICU transforms most spaces into an ASCII space and most
// slashes into an ASCII solidus. But one of the two callers uses this
// on characters that have not been processed by ICU, so they are needed here.
if (!u_isprint(charCode) || u_isUWhiteSpace(charCode) || u_hasBinaryProperty(charCode, UCHAR_DEFAULT_IGNORABLE_CODE_POINT))
return true;
switch (charCode) {
case 0x00BC: /* VULGAR FRACTION ONE QUARTER */
case 0x00BD: /* VULGAR FRACTION ONE HALF */
case 0x00BE: /* VULGAR FRACTION THREE QUARTERS */
case 0x00ED: /* LATIN SMALL LETTER I WITH ACUTE */
/* 0x0131 LATIN SMALL LETTER DOTLESS I is intentionally not considered a lookalike character because it is visually distinguishable from i and it has legitimate use in the Turkish language. */
case 0x01C0: /* LATIN LETTER DENTAL CLICK */
case 0x01C3: /* LATIN LETTER RETROFLEX CLICK */
case 0x0251: /* LATIN SMALL LETTER ALPHA */
case 0x0261: /* LATIN SMALL LETTER SCRIPT G */
case 0x027E: /* LATIN SMALL LETTER R WITH FISHHOOK */
case 0x02D0: /* MODIFIER LETTER TRIANGULAR COLON */
case 0x0335: /* COMBINING SHORT STROKE OVERLAY */
case 0x0337: /* COMBINING SHORT SOLIDUS OVERLAY */
case 0x0338: /* COMBINING LONG SOLIDUS OVERLAY */
case 0x0589: /* ARMENIAN FULL STOP */
case 0x05B4: /* HEBREW POINT HIRIQ */
case 0x05BC: /* HEBREW POINT DAGESH OR MAPIQ */
case 0x05C3: /* HEBREW PUNCTUATION SOF PASUQ */
case 0x05F4: /* HEBREW PUNCTUATION GERSHAYIM */
case 0x0609: /* ARABIC-INDIC PER MILLE SIGN */
case 0x060A: /* ARABIC-INDIC PER TEN THOUSAND SIGN */
case 0x0650: /* ARABIC KASRA */
case 0x0660: /* ARABIC INDIC DIGIT ZERO */
case 0x066A: /* ARABIC PERCENT SIGN */
case 0x06D4: /* ARABIC FULL STOP */
case 0x06F0: /* EXTENDED ARABIC INDIC DIGIT ZERO */
case 0x0701: /* SYRIAC SUPRALINEAR FULL STOP */
case 0x0702: /* SYRIAC SUBLINEAR FULL STOP */
case 0x0703: /* SYRIAC SUPRALINEAR COLON */
case 0x0704: /* SYRIAC SUBLINEAR COLON */
case 0x1735: /* PHILIPPINE SINGLE PUNCTUATION */
case 0x1D04: /* LATIN LETTER SMALL CAPITAL C */
case 0x1D0F: /* LATIN LETTER SMALL CAPITAL O */
case 0x1D1C: /* LATIN LETTER SMALL CAPITAL U */
case 0x1D20: /* LATIN LETTER SMALL CAPITAL V */
case 0x1D21: /* LATIN LETTER SMALL CAPITAL W */
case 0x1D22: /* LATIN LETTER SMALL CAPITAL Z */
case 0x1ECD: /* LATIN SMALL LETTER O WITH DOT BELOW */
case 0x2010: /* HYPHEN */
case 0x2011: /* NON-BREAKING HYPHEN */
case 0x2024: /* ONE DOT LEADER */
case 0x2027: /* HYPHENATION POINT */
case 0x2039: /* SINGLE LEFT-POINTING ANGLE QUOTATION MARK */
case 0x203A: /* SINGLE RIGHT-POINTING ANGLE QUOTATION MARK */
case 0x2041: /* CARET INSERTION POINT */
case 0x2044: /* FRACTION SLASH */
case 0x2052: /* COMMERCIAL MINUS SIGN */
case 0x2153: /* VULGAR FRACTION ONE THIRD */
case 0x2154: /* VULGAR FRACTION TWO THIRDS */
case 0x2155: /* VULGAR FRACTION ONE FIFTH */
case 0x2156: /* VULGAR FRACTION TWO FIFTHS */
case 0x2157: /* VULGAR FRACTION THREE FIFTHS */
case 0x2158: /* VULGAR FRACTION FOUR FIFTHS */
case 0x2159: /* VULGAR FRACTION ONE SIXTH */
case 0x215A: /* VULGAR FRACTION FIVE SIXTHS */
case 0x215B: /* VULGAR FRACTION ONE EIGHT */
case 0x215C: /* VULGAR FRACTION THREE EIGHTHS */
case 0x215D: /* VULGAR FRACTION FIVE EIGHTHS */
case 0x215E: /* VULGAR FRACTION SEVEN EIGHTHS */
case 0x215F: /* FRACTION NUMERATOR ONE */
case 0x2212: /* MINUS SIGN */
case 0x2215: /* DIVISION SLASH */
case 0x2216: /* SET MINUS */
case 0x2236: /* RATIO */
case 0x233F: /* APL FUNCTIONAL SYMBOL SLASH BAR */
case 0x23AE: /* INTEGRAL EXTENSION */
case 0x244A: /* OCR DOUBLE BACKSLASH */
case 0x2571: /* BOX DRAWINGS LIGHT DIAGONAL UPPER RIGHT TO LOWER LEFT */
case 0x2572: /* BOX DRAWINGS LIGHT DIAGONAL UPPER LEFT TO LOWER RIGHT */
case 0x29F6: /* SOLIDUS WITH OVERBAR */
case 0x29F8: /* BIG SOLIDUS */
case 0x2AFB: /* TRIPLE SOLIDUS BINARY RELATION */
case 0x2AFD: /* DOUBLE SOLIDUS OPERATOR */
case 0x2FF0: /* IDEOGRAPHIC DESCRIPTION CHARACTER LEFT TO RIGHT */
case 0x2FF1: /* IDEOGRAPHIC DESCRIPTION CHARACTER ABOVE TO BELOW */
case 0x2FF2: /* IDEOGRAPHIC DESCRIPTION CHARACTER LEFT TO MIDDLE AND RIGHT */
case 0x2FF3: /* IDEOGRAPHIC DESCRIPTION CHARACTER ABOVE TO MIDDLE AND BELOW */
case 0x2FF4: /* IDEOGRAPHIC DESCRIPTION CHARACTER FULL SURROUND */
case 0x2FF5: /* IDEOGRAPHIC DESCRIPTION CHARACTER SURROUND FROM ABOVE */
case 0x2FF6: /* IDEOGRAPHIC DESCRIPTION CHARACTER SURROUND FROM BELOW */
case 0x2FF7: /* IDEOGRAPHIC DESCRIPTION CHARACTER SURROUND FROM LEFT */
case 0x2FF8: /* IDEOGRAPHIC DESCRIPTION CHARACTER SURROUND FROM UPPER LEFT */
case 0x2FF9: /* IDEOGRAPHIC DESCRIPTION CHARACTER SURROUND FROM UPPER RIGHT */
case 0x2FFA: /* IDEOGRAPHIC DESCRIPTION CHARACTER SURROUND FROM LOWER LEFT */
case 0x2FFB: /* IDEOGRAPHIC DESCRIPTION CHARACTER OVERLAID */
case 0x3002: /* IDEOGRAPHIC FULL STOP */
case 0x3008: /* LEFT ANGLE BRACKET */
case 0x3014: /* LEFT TORTOISE SHELL BRACKET */
case 0x3015: /* RIGHT TORTOISE SHELL BRACKET */
case 0x3033: /* VERTICAL KANA REPEAT MARK UPPER HALF */
case 0x3035: /* VERTICAL KANA REPEAT MARK LOWER HALF */
case 0x321D: /* PARENTHESIZED KOREAN CHARACTER OJEON */
case 0x321E: /* PARENTHESIZED KOREAN CHARACTER O HU */
case 0x33AE: /* SQUARE RAD OVER S */
case 0x33AF: /* SQUARE RAD OVER S SQUARED */
case 0x33C6: /* SQUARE C OVER KG */
case 0x33DF: /* SQUARE A OVER M */
case 0x05B9: /* HEBREW POINT HOLAM */
case 0x05BA: /* HEBREW POINT HOLAM HASER FOR VAV */
case 0x05C1: /* HEBREW POINT SHIN DOT */
case 0x05C2: /* HEBREW POINT SIN DOT */
case 0x05C4: /* HEBREW MARK UPPER DOT */
case 0xA731: /* LATIN LETTER SMALL CAPITAL S */
case 0xA771: /* LATIN SMALL LETTER DUM */
case 0xA789: /* MODIFIER LETTER COLON */
case 0xFE14: /* PRESENTATION FORM FOR VERTICAL SEMICOLON */
case 0xFE15: /* PRESENTATION FORM FOR VERTICAL EXCLAMATION MARK */
case 0xFE3F: /* PRESENTATION FORM FOR VERTICAL LEFT ANGLE BRACKET */
case 0xFE5D: /* SMALL LEFT TORTOISE SHELL BRACKET */
case 0xFE5E: /* SMALL RIGHT TORTOISE SHELL BRACKET */
case 0xFF0E: /* FULLWIDTH FULL STOP */
case 0xFF0F: /* FULL WIDTH SOLIDUS */
case 0xFF61: /* HALFWIDTH IDEOGRAPHIC FULL STOP */
case 0xFFFC: /* OBJECT REPLACEMENT CHARACTER */
case 0xFFFD: /* REPLACEMENT CHARACTER */
case 0x1F50F: /* LOCK WITH INK PEN */
case 0x1F510: /* CLOSED LOCK WITH KEY */
case 0x1F511: /* KEY */
case 0x1F512: /* LOCK */
case 0x1F513: /* OPEN LOCK */
return true;
case 0x0307: /* COMBINING DOT ABOVE */
return previousCodePoint == 0x0237 /* LATIN SMALL LETTER DOTLESS J */
|| previousCodePoint == 0x0131 /* LATIN SMALL LETTER DOTLESS I */
|| previousCodePoint == 0x05D5; /* HEBREW LETTER VAV */
case 0x0548: /* ARMENIAN CAPITAL LETTER VO */
case 0x054D: /* ARMENIAN CAPITAL LETTER SEH */
case 0x0578: /* ARMENIAN SMALL LETTER VO */
case 0x057D: /* ARMENIAN SMALL LETTER SEH */
return previousCodePoint
&& !isASCIIDigitOrValidHostCharacter(previousCodePoint.value())
&& !isArmenianScriptCharacter(previousCodePoint.value());
case '.':
return false;
default:
return previousCodePoint
&& isArmenianLookalikeCharacter(previousCodePoint.value())
&& !(isArmenianScriptCharacter(charCode) || isASCIIDigitOrValidHostCharacter(charCode));
}
}
void whiteListIDNScript(const char* scriptName)
{
int32_t script = u_getPropertyValueEnum(UCHAR_SCRIPT, scriptName);
if (script >= 0 && script < USCRIPT_CODE_LIMIT) {
size_t index = script / 32;
uint32_t mask = 1 << (script % 32);
IDNScriptWhiteList[index] |= mask;
}
}
void initializeDefaultIDNScriptWhiteList()
{
const char* defaultIDNScriptWhiteList[20] = {
"Common",
"Inherited",
"Arabic",
"Armenian",
"Bopomofo",
"Canadian_Aboriginal",
"Devanagari",
"Deseret",
"Gujarati",
"Gurmukhi",
"Hangul",
"Han",
"Hebrew",
"Hiragana",
"Katakana_Or_Hiragana",
"Katakana",
"Latin",
"Tamil",
"Thai",
"Yi",
};
for (const char* scriptName : defaultIDNScriptWhiteList)
whiteListIDNScript(scriptName);
}
static bool allCharactersInIDNScriptWhiteList(const UChar* buffer, int32_t length)
{
loadIDNScriptWhiteList();
int32_t i = 0;
Optional<UChar32> previousCodePoint;
while (i < length) {
UChar32 c;
U16_NEXT(buffer, i, length, c);
UErrorCode error = U_ZERO_ERROR;
UScriptCode script = uscript_getScript(c, &error);
if (error != U_ZERO_ERROR) {
LOG_ERROR("got ICU error while trying to look at scripts: %d", error);
return false;
}
if (script < 0) {
LOG_ERROR("got negative number for script code from ICU: %d", script);
return false;
}
if (script >= USCRIPT_CODE_LIMIT)
return false;
size_t index = script / 32;
uint32_t mask = 1 << (script % 32);
if (!(IDNScriptWhiteList[index] & mask))
return false;
if (isLookalikeCharacter(previousCodePoint, c))
return false;
previousCodePoint = c;
}
return true;
}
template<typename Func>
static inline bool isSecondLevelDomainNameAllowedByTLDRules(const UChar* buffer, int32_t length, Func characterIsAllowed)
{
ASSERT(length > 0);
for (int32_t i = length - 1; i >= 0; --i) {
UChar ch = buffer[i];
if (characterIsAllowed(ch))
continue;
// Only check the second level domain. Lower level registrars may have different rules.
if (ch == '.')
break;
return false;
}
return true;
}
#define CHECK_RULES_IF_SUFFIX_MATCHES(suffix, function) \
{ \
static const int32_t suffixLength = sizeof(suffix) / sizeof(suffix[0]); \
if (length > suffixLength && !memcmp(buffer + length - suffixLength, suffix, sizeof(suffix))) \
return isSecondLevelDomainNameAllowedByTLDRules(buffer, length - suffixLength, function); \
}
static bool isRussianDomainNameCharacter(UChar ch)
{
// Only modern Russian letters, digits and dashes are allowed.
return (ch >= 0x0430 && ch <= 0x044f) || ch == 0x0451 || isASCIIDigit(ch) || ch == '-';
}
static bool allCharactersAllowedByTLDRules(const UChar* buffer, int32_t length)
{
// Skip trailing dot for root domain.
if (buffer[length - 1] == '.')
length--;
// http://cctld.ru/files/pdf/docs/rules_ru-rf.pdf
static const UChar cyrillicRF[] = {
'.',
0x0440, // CYRILLIC SMALL LETTER ER
0x0444, // CYRILLIC SMALL LETTER EF
};
CHECK_RULES_IF_SUFFIX_MATCHES(cyrillicRF, isRussianDomainNameCharacter);
// http://rusnames.ru/rules.pl
static const UChar cyrillicRUS[] = {
'.',
0x0440, // CYRILLIC SMALL LETTER ER
0x0443, // CYRILLIC SMALL LETTER U
0x0441, // CYRILLIC SMALL LETTER ES
};
CHECK_RULES_IF_SUFFIX_MATCHES(cyrillicRUS, isRussianDomainNameCharacter);
// http://ru.faitid.org/projects/moscow/documents/moskva/idn
static const UChar cyrillicMOSKVA[] = {
'.',
0x043C, // CYRILLIC SMALL LETTER EM
0x043E, // CYRILLIC SMALL LETTER O
0x0441, // CYRILLIC SMALL LETTER ES
0x043A, // CYRILLIC SMALL LETTER KA
0x0432, // CYRILLIC SMALL LETTER VE
0x0430, // CYRILLIC SMALL LETTER A
};
CHECK_RULES_IF_SUFFIX_MATCHES(cyrillicMOSKVA, isRussianDomainNameCharacter);
// http://www.dotdeti.ru/foruser/docs/regrules.php
static const UChar cyrillicDETI[] = {
'.',
0x0434, // CYRILLIC SMALL LETTER DE
0x0435, // CYRILLIC SMALL LETTER IE
0x0442, // CYRILLIC SMALL LETTER TE
0x0438, // CYRILLIC SMALL LETTER I
};
CHECK_RULES_IF_SUFFIX_MATCHES(cyrillicDETI, isRussianDomainNameCharacter);
// http://corenic.org - rules not published. The word is Russian, so only allowing Russian at this time,
// although we may need to revise the checks if this ends up being used with other languages spoken in Russia.
static const UChar cyrillicONLAYN[] = {
'.',
0x043E, // CYRILLIC SMALL LETTER O
0x043D, // CYRILLIC SMALL LETTER EN
0x043B, // CYRILLIC SMALL LETTER EL
0x0430, // CYRILLIC SMALL LETTER A
0x0439, // CYRILLIC SMALL LETTER SHORT I
0x043D, // CYRILLIC SMALL LETTER EN
};
CHECK_RULES_IF_SUFFIX_MATCHES(cyrillicONLAYN, isRussianDomainNameCharacter);
// http://corenic.org - same as above.
static const UChar cyrillicSAYT[] = {
'.',
0x0441, // CYRILLIC SMALL LETTER ES
0x0430, // CYRILLIC SMALL LETTER A
0x0439, // CYRILLIC SMALL LETTER SHORT I
0x0442, // CYRILLIC SMALL LETTER TE
};
CHECK_RULES_IF_SUFFIX_MATCHES(cyrillicSAYT, isRussianDomainNameCharacter);
// http://pir.org/products/opr-domain/ - rules not published. According to the registry site,
// the intended audience is "Russian and other Slavic-speaking markets".
// Chrome appears to only allow Russian, so sticking with that for now.
static const UChar cyrillicORG[] = {
'.',
0x043E, // CYRILLIC SMALL LETTER O
0x0440, // CYRILLIC SMALL LETTER ER
0x0433, // CYRILLIC SMALL LETTER GHE
};
CHECK_RULES_IF_SUFFIX_MATCHES(cyrillicORG, isRussianDomainNameCharacter);
// http://cctld.by/rules.html
static const UChar cyrillicBEL[] = {
'.',
0x0431, // CYRILLIC SMALL LETTER BE
0x0435, // CYRILLIC SMALL LETTER IE
0x043B, // CYRILLIC SMALL LETTER EL
};
CHECK_RULES_IF_SUFFIX_MATCHES(cyrillicBEL, [](UChar ch) {
// Russian and Byelorussian letters, digits and dashes are allowed.
return (ch >= 0x0430 && ch <= 0x044f) || ch == 0x0451 || ch == 0x0456 || ch == 0x045E || ch == 0x2019 || isASCIIDigit(ch) || ch == '-';
});
// http://www.nic.kz/docs/poryadok_vnedreniya_kaz_ru.pdf
static const UChar cyrillicKAZ[] = {
'.',
0x049B, // CYRILLIC SMALL LETTER KA WITH DESCENDER
0x0430, // CYRILLIC SMALL LETTER A
0x0437, // CYRILLIC SMALL LETTER ZE
};
CHECK_RULES_IF_SUFFIX_MATCHES(cyrillicKAZ, [](UChar ch) {
// Kazakh letters, digits and dashes are allowed.
return (ch >= 0x0430 && ch <= 0x044f) || ch == 0x0451 || ch == 0x04D9 || ch == 0x0493 || ch == 0x049B || ch == 0x04A3 || ch == 0x04E9 || ch == 0x04B1 || ch == 0x04AF || ch == 0x04BB || ch == 0x0456 || isASCIIDigit(ch) || ch == '-';
});
// http://uanic.net/docs/documents-ukr/Rules%20of%20UKR_v4.0.pdf
static const UChar cyrillicUKR[] = {
'.',
0x0443, // CYRILLIC SMALL LETTER U
0x043A, // CYRILLIC SMALL LETTER KA
0x0440, // CYRILLIC SMALL LETTER ER
};
CHECK_RULES_IF_SUFFIX_MATCHES(cyrillicUKR, [](UChar ch) {
// Russian and Ukrainian letters, digits and dashes are allowed.
return (ch >= 0x0430 && ch <= 0x044f) || ch == 0x0451 || ch == 0x0491 || ch == 0x0404 || ch == 0x0456 || ch == 0x0457 || isASCIIDigit(ch) || ch == '-';
});
// http://www.rnids.rs/data/DOKUMENTI/idn-srb-policy-termsofuse-v1.4-eng.pdf
static const UChar cyrillicSRB[] = {
'.',
0x0441, // CYRILLIC SMALL LETTER ES
0x0440, // CYRILLIC SMALL LETTER ER
0x0431, // CYRILLIC SMALL LETTER BE
};
CHECK_RULES_IF_SUFFIX_MATCHES(cyrillicSRB, [](UChar ch) {
// Serbian letters, digits and dashes are allowed.
return (ch >= 0x0430 && ch <= 0x0438) || (ch >= 0x043A && ch <= 0x0448) || ch == 0x0452 || ch == 0x0458 || ch == 0x0459 || ch == 0x045A || ch == 0x045B || ch == 0x045F || isASCIIDigit(ch) || ch == '-';
});
// http://marnet.mk/doc/pravilnik-mk-mkd.pdf
static const UChar cyrillicMKD[] = {
'.',
0x043C, // CYRILLIC SMALL LETTER EM
0x043A, // CYRILLIC SMALL LETTER KA
0x0434, // CYRILLIC SMALL LETTER DE
};
CHECK_RULES_IF_SUFFIX_MATCHES(cyrillicMKD, [](UChar ch) {
// Macedonian letters, digits and dashes are allowed.
return (ch >= 0x0430 && ch <= 0x0438) || (ch >= 0x043A && ch <= 0x0448) || ch == 0x0453 || ch == 0x0455 || ch == 0x0458 || ch == 0x0459 || ch == 0x045A || ch == 0x045C || ch == 0x045F || isASCIIDigit(ch) || ch == '-';
});
// https://www.mon.mn/cs/
static const UChar cyrillicMON[] = {
'.',
0x043C, // CYRILLIC SMALL LETTER EM
0x043E, // CYRILLIC SMALL LETTER O
0x043D, // CYRILLIC SMALL LETTER EN
};
CHECK_RULES_IF_SUFFIX_MATCHES(cyrillicMON, [](UChar ch) {
// Mongolian letters, digits and dashes are allowed.
return (ch >= 0x0430 && ch <= 0x044f) || ch == 0x0451 || ch == 0x04E9 || ch == 0x04AF || isASCIIDigit(ch) || ch == '-';
});
// https://www.icann.org/sites/default/files/packages/lgr/lgr-second-level-bulgarian-30aug16-en.html
static const UChar cyrillicBG[] = {
'.',
0x0431, // CYRILLIC SMALL LETTER BE
0x0433 // CYRILLIC SMALL LETTER GHE
};
CHECK_RULES_IF_SUFFIX_MATCHES(cyrillicBG, [](UChar ch) {
return (ch >= 0x0430 && ch <= 0x044A) || ch == 0x044C || (ch >= 0x044E && ch <= 0x0450) || ch == 0x045D || isASCIIDigit(ch) || ch == '-';
});
// Not a known top level domain with special rules.
return false;
}
// Return value of null means no mapping is necessary.
Optional<String> mapHostName(const String& hostName, const Optional<URLDecodeFunction>& decodeFunction)
{
if (hostName.length() > hostNameBufferLength)
return String();
if (!hostName.length())
return String();
String string;
if (decodeFunction && string.contains('%'))
string = (*decodeFunction)(hostName);
else
string = hostName;
unsigned length = string.length();
auto sourceBuffer = string.charactersWithNullTermination();
UChar destinationBuffer[hostNameBufferLength];
UErrorCode uerror = U_ZERO_ERROR;
UIDNAInfo processingDetails = UIDNA_INFO_INITIALIZER;
int32_t numCharactersConverted = (decodeFunction ? uidna_nameToASCII : uidna_nameToUnicode)(&URLParser::internationalDomainNameTranscoder(), sourceBuffer.data(), length, destinationBuffer, hostNameBufferLength, &processingDetails, &uerror);
int allowedErrors = decodeFunction ? 0 : UIDNA_ERROR_EMPTY_LABEL | UIDNA_ERROR_LEADING_HYPHEN | UIDNA_ERROR_TRAILING_HYPHEN | UIDNA_ERROR_HYPHEN_3_4;
if (length && (U_FAILURE(uerror) || processingDetails.errors & ~allowedErrors))
return nullopt;
if (numCharactersConverted == static_cast<int32_t>(length) && !memcmp(sourceBuffer.data(), destinationBuffer, length * sizeof(UChar)))
return String();
if (!decodeFunction && !allCharactersInIDNScriptWhiteList(destinationBuffer, numCharactersConverted) && !allCharactersAllowedByTLDRules(destinationBuffer, numCharactersConverted))
return String();
return String(destinationBuffer, numCharactersConverted);
}
using MappingRangesVector = Optional<Vector<std::tuple<unsigned, unsigned, String>>>;
static void collectRangesThatNeedMapping(const String& string, unsigned location, unsigned length, MappingRangesVector& array, const Optional<URLDecodeFunction>& decodeFunction)
{
// Generally, we want to optimize for the case where there is one host name that does not need mapping.
// Therefore, we use null to indicate no mapping here and an empty array to indicate error.
String substring = string.substringSharingImpl(location, length);
Optional<String> host = mapHostName(substring, decodeFunction);
if (host && !*host)
return;
if (!array)
array = Vector<std::tuple<unsigned, unsigned, String>>();
if (host)
array->constructAndAppend(location, length, *host);
}
static void applyHostNameFunctionToMailToURLString(const String& string, const Optional<URLDecodeFunction>& decodeFunction, MappingRangesVector& array)
{
// In a mailto: URL, host names come after a '@' character and end with a '>' or ',' or '?' character.
// Skip quoted strings so that characters in them don't confuse us.
// When we find a '?' character, we are past the part of the URL that contains host names.
unsigned stringLength = string.length();
unsigned current = 0;
while (1) {
// Find start of host name or of quoted string.
auto hostNameOrStringStart = string.find([](UChar ch) {
return ch == '"' || ch == '@' || ch == '?';
}, current);
if (hostNameOrStringStart == notFound)
return;
UChar c = string[hostNameOrStringStart];
current = hostNameOrStringStart + 1;
if (c == '?')
return;
if (c == '@') {
// Find end of host name.
unsigned hostNameStart = current;
auto hostNameEnd = string.find([](UChar ch) {
return ch == '>' || ch == ',' || ch == '?';
}, current);
bool done;
if (hostNameEnd == notFound) {
hostNameEnd = stringLength;
done = true;
} else {
current = hostNameEnd;
done = false;
}
// Process host name range.
collectRangesThatNeedMapping(string, hostNameStart, hostNameEnd - hostNameStart, array, decodeFunction);
if (done)
return;
} else {
// Skip quoted string.
ASSERT(c == '"');
while (1) {
auto escapedCharacterOrStringEnd = string.find([](UChar ch) {
return ch == '"' || ch == '\\';
}, current);
if (escapedCharacterOrStringEnd == notFound)
return;
c = string[escapedCharacterOrStringEnd];
current = escapedCharacterOrStringEnd + 1;
// If we are the end of the string, then break from the string loop back to the host name loop.
if (c == '"')
break;
// Skip escaped character.
ASSERT(c == '\\');
if (current == stringLength)
return;
++current;
}
}
}
}
static void applyHostNameFunctionToURLString(const String& string, const Optional<URLDecodeFunction>& decodeFunction, MappingRangesVector& array)
{
// Find hostnames. Too bad we can't use any real URL-parsing code to do this,
// but we have to do it before doing all the %-escaping, and this is the only
// code we have that parses mailto URLs anyway.
// Maybe we should implement this using a character buffer instead?
if (protocolIs(string, "mailto")) {
applyHostNameFunctionToMailToURLString(string, decodeFunction, array);
return;
}
// Find the host name in a hierarchical URL.
// It comes after a "://" sequence, with scheme characters preceding.
// If ends with the end of the string or a ":", "/", or a "?".
// If there is a "@" character, the host part is just the part after the "@".
static const char* separator = "://";
auto separatorIndex = string.find(separator);
if (separatorIndex == notFound)
return;
unsigned authorityStart = separatorIndex + strlen(separator);
// Check that all characters before the :// are valid scheme characters.
if (StringView { string }.left(separatorIndex).contains([](UChar character) {
return !(isASCIIAlphanumeric(character) || character == '+' || character == '-' || character == '.');
}))
return;
// Find terminating character.
auto hostNameTerminator = string.find([](UChar character) {
return character == ':' || character == '/' || character == '?' || character == '#';
}, authorityStart);
unsigned hostNameEnd = hostNameTerminator == notFound ? string.length() : hostNameTerminator;
// Find "@" for the start of the host name.
auto userInfoTerminator = StringView { string }.left(hostNameEnd).find('@', authorityStart);
unsigned hostNameStart = userInfoTerminator == notFound ? authorityStart : userInfoTerminator + 1;
collectRangesThatNeedMapping(string, hostNameStart, hostNameEnd - hostNameStart, array, decodeFunction);
}
String mapHostNames(const String& string, const Optional<URLDecodeFunction>& decodeFunction)
{
// Generally, we want to optimize for the case where there is one host name that does not need mapping.
if (decodeFunction && string.isAllASCII())
return string;
// Make a list of ranges that actually need mapping.
MappingRangesVector hostNameRanges;
applyHostNameFunctionToURLString(string, decodeFunction, hostNameRanges);
if (!hostNameRanges)
return string;
if (hostNameRanges->isEmpty())
return { };
// Do the mapping.
String result = string;
while (!hostNameRanges->isEmpty()) {
auto [location, length, mappedHostName] = hostNameRanges->takeLast();
result = result.replace(location, length, mappedHostName);
}
return result;
}
static String escapeUnsafeCharacters(const String& sourceBuffer)
{
unsigned length = sourceBuffer.length();
Optional<UChar32> previousCodePoint;
unsigned i;
for (i = 0; i < length; ) {
UChar32 c = sourceBuffer.characterStartingAt(i);
if (isLookalikeCharacter(previousCodePoint, sourceBuffer.characterStartingAt(i)))
break;
previousCodePoint = c;
i += U16_LENGTH(c);
}
if (i == length)
return sourceBuffer;
Vector<UChar, urlBytesBufferLength> outBuffer;
outBuffer.grow(i);
if (sourceBuffer.is8Bit())
StringImpl::copyCharacters(outBuffer.data(), sourceBuffer.characters8(), i);
else
StringImpl::copyCharacters(outBuffer.data(), sourceBuffer.characters16(), i);
for (; i < length; ) {
UChar32 c = sourceBuffer.characterStartingAt(i);
unsigned characterLength = U16_LENGTH(c);
if (isLookalikeCharacter(previousCodePoint, c)) {
uint8_t utf8Buffer[4];
size_t offset = 0;
UBool failure = false;
U8_APPEND(utf8Buffer, offset, 4, c, failure);
ASSERT_UNUSED(failure, !failure);
for (size_t j = 0; j < offset; ++j) {
outBuffer.append('%');
outBuffer.append(upperNibbleToASCIIHexDigit(utf8Buffer[j]));
outBuffer.append(lowerNibbleToASCIIHexDigit(utf8Buffer[j]));
}
} else {
for (unsigned j = 0; j < characterLength; ++j)
outBuffer.append(sourceBuffer[i + j]);
}
previousCodePoint = c;
i += characterLength;
}
return String::adopt(WTFMove(outBuffer));
}
String userVisibleURL(const CString& url)
{
auto* before = reinterpret_cast<const unsigned char*>(url.data());
int length = url.length();
if (!length)
return { };
bool mayNeedHostNameDecoding = false;
Checked<int, RecordOverflow> bufferLength = length;
bufferLength = bufferLength * 3 + 1; // The buffer should be large enough to %-escape every character.
if (bufferLength.hasOverflowed())
return { };
Vector<char, urlBytesBufferLength> after(bufferLength.unsafeGet());
char* q = after.data();
{
const unsigned char* p = before;
for (int i = 0; i < length; i++) {
unsigned char c = p[i];
// unescape escape sequences that indicate bytes greater than 0x7f
if (c == '%' && i + 2 < length && isASCIIHexDigit(p[i + 1]) && isASCIIHexDigit(p[i + 2])) {
auto u = toASCIIHexValue(p[i + 1], p[i + 2]);
if (u > 0x7f) {
// unescape
*q++ = u;
} else {
// do not unescape
*q++ = p[i];
*q++ = p[i + 1];
*q++ = p[i + 2];
}
i += 2;
} else {
*q++ = c;
// Check for "xn--" in an efficient, non-case-sensitive, way.
if (c == '-' && i >= 3 && !mayNeedHostNameDecoding && (q[-4] | 0x20) == 'x' && (q[-3] | 0x20) == 'n' && q[-2] == '-')
mayNeedHostNameDecoding = true;
}
}
*q = '\0';
}
// Check string to see if it can be converted to display using UTF-8
String result = String::fromUTF8(after.data());
if (!result) {
// Could not convert to UTF-8.
// Convert characters greater than 0x7f to escape sequences.
// Shift current string to the end of the buffer
// then we will copy back bytes to the start of the buffer
// as we convert.
int afterlength = q - after.data();
char* p = after.data() + bufferLength.unsafeGet() - afterlength - 1;
memmove(p, after.data(), afterlength + 1); // copies trailing '\0'
char* q = after.data();
while (*p) {
unsigned char c = *p;
if (c > 0x7f) {
*q++ = '%';
*q++ = upperNibbleToASCIIHexDigit(c);
*q++ = lowerNibbleToASCIIHexDigit(c);
} else
*q++ = *p;
p++;
}
*q = '\0';
// Note: after.data() points to a null-terminated, pure ASCII string.
result = String::fromUTF8(after.data());
ASSERT(!!result);
}
// Note: result is UTF–16 string, created from either a valid UTF-8 string,
// or a pure ASCII string (where all bytes with the high bit set are
// percent-encoded).
if (mayNeedHostNameDecoding) {
// FIXME: Is it good to ignore the failure of mapHostNames and keep result intact?
auto mappedResult = mapHostNames(result, nullopt);
if (!!mappedResult)
result = mappedResult;
}
return escapeUnsafeCharacters(normalizedNFC(result));
}
} // namespace URLHelpers
} // namespace WTF