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#include "punycode.h"
#include <contrib/libs/libidn/idna.h>
#include <contrib/libs/libidn/punycode.h>
#include <util/charset/wide.h>
#include <util/generic/ptr.h>
#include <util/generic/vector.h>
#include <cstdlib>
static inline void CheckPunycodeResult(int rc) {
if (rc != PUNYCODE_SUCCESS)
ythrow TPunycodeError() << punycode_strerror(static_cast<Punycode_status>(rc));
}
static inline void CheckIdnaResult(int rc) {
if (rc != IDNA_SUCCESS)
ythrow TPunycodeError() << idna_strerror(static_cast<Idna_rc>(rc));
}
// UTF-32 helpers
static inline void AppendWideToUtf32(const TWtringBuf& in, TVector<ui32>& out) {
out.reserve(out.size() + in.size() + 1);
const wchar16* b = in.begin();
const wchar16* e = in.end();
while (b < e) {
out.push_back(ReadSymbolAndAdvance(b, e));
}
}
static inline void AppendUtf32ToWide(const ui32* in, size_t len, TUtf16String& out) {
out.reserve(out.size() + len);
const ui32* b = in;
const ui32* e = in + len;
for (; b != e; ++b) {
WriteSymbol(wchar32(*b), out);
}
}
TStringBuf WideToPunycode(const TWtringBuf& in16, TString& out) {
TVector<ui32> in32;
AppendWideToUtf32(in16, in32);
size_t outlen = in32.size();
int rc;
do {
outlen *= 2;
out.ReserveAndResize(outlen);
rc = punycode_encode(in32.size(), in32.data(), nullptr, &outlen, out.begin());
} while (rc == PUNYCODE_BIG_OUTPUT);
CheckPunycodeResult(rc);
out.resize(outlen);
return out;
}
TWtringBuf PunycodeToWide(const TStringBuf& in, TUtf16String& out16) {
size_t outlen = in.size();
TVector<ui32> out32(outlen);
int rc = punycode_decode(in.size(), in.data(), &outlen, out32.begin(), nullptr);
CheckPunycodeResult(rc);
AppendUtf32ToWide(out32.begin(), outlen, out16);
return out16;
}
namespace {
template <typename TChar>
struct TIdnaResult {
TChar* Data = nullptr;
~TIdnaResult() {
free(Data);
}
};
}
TString HostNameToPunycode(const TWtringBuf& unicodeHost) {
TVector<ui32> in32;
AppendWideToUtf32(unicodeHost, in32);
in32.push_back(0);
TIdnaResult<char> out;
int rc = idna_to_ascii_4z(in32.begin(), &out.Data, 0);
CheckIdnaResult(rc);
return out.Data;
}
TUtf16String PunycodeToHostName(const TStringBuf& punycodeHost) {
if (!IsStringASCII(punycodeHost.begin(), punycodeHost.end()))
ythrow TPunycodeError() << "Non-ASCII punycode input";
size_t len = punycodeHost.size();
TVector<ui32> in32(len + 1, 0);
for (size_t i = 0; i < len; ++i)
in32[i] = static_cast<ui8>(punycodeHost[i]);
in32[len] = 0;
TIdnaResult<ui32> out;
int rc = idna_to_unicode_4z4z(in32.begin(), &out.Data, 0);
CheckIdnaResult(rc);
TUtf16String decoded;
AppendUtf32ToWide(out.Data, std::char_traits<ui32>::length(out.Data), decoded);
return decoded;
}
TString ForceHostNameToPunycode(const TWtringBuf& unicodeHost) {
try {
return HostNameToPunycode(unicodeHost);
} catch (const TPunycodeError&) {
return WideToUTF8(unicodeHost);
}
}
TUtf16String ForcePunycodeToHostName(const TStringBuf& punycodeHost) {
try {
return PunycodeToHostName(punycodeHost);
} catch (const TPunycodeError&) {
return UTF8ToWide(punycodeHost);
}
}
bool CanBePunycodeHostName(const TStringBuf& host) {
if (!IsStringASCII(host.begin(), host.end()))
return false;
static constexpr TStringBuf ACE = "xn--";
TStringBuf tail(host);
while (tail) {
const TStringBuf label = tail.NextTok('.');
if (label.StartsWith(ACE))
return true;
}
return false;
}
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