NS_IMETHODIMP nsIDNService::ConvertToDisplayIDN(const nsACString & input, PRBool * _isASCII, nsACString & _retval)
{
// If host is ACE, then convert to UTF-8 if the host is in the IDN whitelist.
// Else, if host is already UTF-8, then make sure it is normalized per IDN.
nsresult rv;
if (IsASCII(input)) {
// first, canonicalize the host to lowercase, for whitelist lookup
_retval = input;
ToLowerCase(_retval);
PRBool isACE;
IsACE(_retval, &isACE);
if (isACE && !mShowPunycode && isInWhitelist(_retval)) {
// ConvertACEtoUTF8() can't fail, but might return the original ACE string
nsCAutoString temp(_retval);
ConvertACEtoUTF8(temp, _retval);
*_isASCII = IsASCII(_retval);
} else {
*_isASCII = PR_TRUE;
}
} else {
// We have to normalize the hostname before testing against the domain
// whitelist (see bug 315411), and to ensure the entire string gets
// normalized.
rv = Normalize(input, _retval);
if (NS_FAILED(rv)) return rv;
if (mShowPunycode && NS_SUCCEEDED(ConvertUTF8toACE(_retval, _retval))) {
*_isASCII = PR_TRUE;
return NS_OK;
}
// normalization could result in an ASCII-only hostname. alternatively, if
// the host is converted to ACE by the normalizer, then the host may contain
// unsafe characters, so leave it ACE encoded. see bug 283016, bug 301694, and bug 309311.
*_isASCII = IsASCII(_retval);
if (!*_isASCII && !isInWhitelist(_retval)) {
*_isASCII = PR_TRUE;
return ConvertUTF8toACE(_retval, _retval);
}
}
return NS_OK;
}
nsresult nsIDNService::decodeACE(const nsACString& in, nsACString& out,
bool allowUnassigned)
{
bool isAce;
IsACE(in, &isAce);
if (!isAce) {
out.Assign(in);
return NS_OK;
}
// RFC 3490 - 4.2 ToUnicode
// The ToUnicode output never contains more code points than its input.
punycode_uint output_length = in.Length() - kACEPrefixLen + 1;
punycode_uint *output = new punycode_uint[output_length];
NS_ENSURE_TRUE(output, NS_ERROR_OUT_OF_MEMORY);
enum punycode_status status = punycode_decode(in.Length() - kACEPrefixLen,
PromiseFlatCString(in).get() + kACEPrefixLen,
&output_length,
output,
nullptr);
if (status != punycode_success) {
delete [] output;
return NS_ERROR_FAILURE;
}
// UCS4 -> UTF8
output[output_length] = 0;
nsAutoString utf16;
ucs4toUtf16(output, utf16);
delete [] output;
if (!isOnlySafeChars(utf16, mIDNBlacklist))
return NS_ERROR_FAILURE;
CopyUTF16toUTF8(utf16, out);
// Validation: encode back to ACE and compare the strings
nsAutoCString ace;
nsresult rv = UTF8toACE(out, ace, allowUnassigned);
NS_ENSURE_SUCCESS(rv, rv);
if (!ace.Equals(in, nsCaseInsensitiveCStringComparator()))
return NS_ERROR_FAILURE;
return NS_OK;
}
