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url: ignore IDN errors when domainname have two hyphens #12966

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url: ignore IDN errors when domainname have two hyphens #12966

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2ee246f
url: ignore IDN errors when domainname have two hyphens
zimbabao May 11, 2017
9dee867
url: ignore IDN errors when domainname have hyphens
zimbabao May 11, 2017
311667b
url: ignore IDN errors when domainname have hyphens
zimbabao May 11, 2017
5e0f58c
url: ignore IDN errors when domainname have hyphens
zimbabao May 11, 2017
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url: ignore IDN errors when domainname have hyphens 
There are valid domain names with hyphens at 3 and 4th position, new
node WHATWG URL parser was failing for it assume its an invalid IDN.
Also filters IDN errors when domain label start or end with hyphen.

Also fix error in ToUnicode

Fixes: #12965
Refs: https://www.icann.org/news/announcement-2000-01-07-en
Refs: whatwg/url#309 (comment)
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@zimbabao
zimbabao committed May 19, 2017
commit 5e0f58c9405b94f4b169f3e883454b7ad37986d4
31 changes: 3 additions & 28 deletions src/node_i18n.cc
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Expand Up @@ -435,8 +435,7 @@ bool InitializeICUDirectory(const std::string& path) {

int32_t ToUnicode(MaybeStackBuffer<char>* buf,
const char* input,
size_t length,
bool lenient) {
size_t length) {
UErrorCode status = U_ZERO_ERROR;
uint32_t options = UIDNA_DEFAULT;
options |= UIDNA_NONTRANSITIONAL_TO_UNICODE;
Expand All @@ -461,29 +460,7 @@ int32_t ToUnicode(MaybeStackBuffer<char>* buf,
&status);
}

// UTS #46's ToUnicode operation applies no validation of domain name length
// (nor a flag requesting it to do so, like VerifyDnsLength for ToASCII). For
// that reason, unlike ToASCII below, ICU4C correctly accepts long domain
// names. However, ICU4C still sets the EMPTY_LABEL error in contrary to UTS
// #46. Therefore, explicitly filters out that error here.
info.errors &= ~UIDNA_ERROR_EMPTY_LABEL;

// These error conditions are mandated unconditionally by UTS #46 version
// 9.0.0 (rev. 17), but were found to be incompatible with many actual domain
// names in the wild. As such, in the current UTS #46 draft (rev. 18) these
// checks are made optional depending on the CheckHyphens flag, which will be
// disabled in WHATWG URL's "domain to unicode" algorithm as soon as the UTS
// #46 draft becomes standard.
// Refs:
// - https://github.com/whatwg/url/issues/53
// - http://www.unicode.org/review/pri317/
// - http://www.unicode.org/reports/tr46/tr46-18.html
// - https://www.icann.org/news/announcement-2000-01-07-en
info.errors &= ~UIDNA_ERROR_HYPHEN_3_4;
info.errors &= ~UIDNA_ERROR_LEADING_HYPHEN;
info.errors &= ~UIDNA_ERROR_TRAILING_HYPHEN;

if (U_FAILURE(status) || (!lenient && info.errors != 0)) {
if (U_FAILURE(status)) {
len = -1;
buf->SetLength(0);
} else {
Expand Down Expand Up @@ -563,11 +540,9 @@ static void ToUnicode(const FunctionCallbackInfo<Value>& args) {
CHECK_GE(args.Length(), 1);
CHECK(args[0]->IsString());
Utf8Value val(env->isolate(), args[0]);
// optional arg
bool lenient = args[1]->BooleanValue(env->context()).FromJust();

MaybeStackBuffer<char> buf;
int32_t len = ToUnicode(&buf, *val, val.length(), lenient);
int32_t len = ToUnicode(&buf, *val, val.length());

if (len < 0) {
return env->ThrowError("Cannot convert name to Unicode");
Expand Down
3 changes: 1 addition & 2 deletions src/node_i18n.h
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Expand Up @@ -43,8 +43,7 @@ int32_t ToASCII(MaybeStackBuffer<char>* buf,
bool lenient = false);
int32_t ToUnicode(MaybeStackBuffer<char>* buf,
const char* input,
size_t length,
bool lenient = false);
size_t length);

} // namespace i18n
} // namespace node
Expand Down
9 changes: 0 additions & 9 deletions test/fixtures/url-idna.js
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Expand Up @@ -219,15 +219,6 @@ module.exports = {
{
url: '\ufffd.com',
mode: 'ascii'
},
{
url: '\ufffd.com',
mode: 'unicode'
},
// invalid Punycode
{
url: 'xn---abc.com',
mode: 'unicode'
}
]
}