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/*
* Copyright (c) 2012-2018 Isode Limited.
* All rights reserved.
* See the COPYING file for more information.
*/
#include <Swiften/IDN/LibIDNConverter.h>
extern "C" {
#include <stringprep.h>
#include <idna.h>
}
#include <cassert>
#include <cstdlib>
#include <vector>
#include <memory>
#include <Swiften/Base/ByteArray.h>
#include <Swiften/Base/SafeAllocator.h>
#include <Swiften/IDN/UTF8Validator.h>
using namespace Swift;
namespace {
static const size_t MAX_STRINGPREP_SIZE = 1024;
const Stringprep_profile* getLibIDNProfile(IDNConverter::StringPrepProfile profile) {
switch(profile) {
case IDNConverter::NamePrep: return stringprep_nameprep;
case IDNConverter::XMPPNodePrep: return stringprep_xmpp_nodeprep;
case IDNConverter::XMPPResourcePrep: return stringprep_xmpp_resourceprep;
case IDNConverter::SASLPrep: return stringprep_saslprep;
}
assert(false);
return nullptr;
}
template<typename StringType, typename ContainerType>
ContainerType getStringPreparedInternal(const StringType& s, IDNConverter::StringPrepProfile profile) {
ContainerType input(s.begin(), s.end());
if (!UTF8IsValid(s.data(), s.size())) {
return ContainerType();
}
// Ensure we have enough space for stringprepping, and that input is always NUL terminated
input.resize(std::max(MAX_STRINGPREP_SIZE, input.size() + 1));
if (stringprep(&input[0], MAX_STRINGPREP_SIZE, static_cast<Stringprep_profile_flags>(0), getLibIDNProfile(profile)) == 0) {
return input;
}
else {
return ContainerType();
}
}
}
namespace Swift {
std::string LibIDNConverter::getStringPrepared(const std::string& s, StringPrepProfile profile) {
std::vector<char> preparedData = getStringPreparedInternal< std::string, std::vector<char> >(s, profile);
if (preparedData.empty()) {
throw std::exception();
}
return std::string(vecptr(preparedData));
}
SafeByteArray LibIDNConverter::getStringPrepared(const SafeByteArray& s, StringPrepProfile profile) {
std::vector<char, SafeAllocator<char> > preparedData = getStringPreparedInternal<SafeByteArray, std::vector<char, SafeAllocator<char> > >(s, profile);
if (preparedData.empty()) {
throw std::exception();
}
return createSafeByteArray(reinterpret_cast<const char*>(vecptr(preparedData)));
}
boost::optional<std::string> LibIDNConverter::getIDNAEncoded(const std::string& domain) {
char* output;
if (idna_to_ascii_8z(domain.c_str(), &output, IDNA_USE_STD3_ASCII_RULES) == IDNA_SUCCESS) {
std::string result(output);
free(output);
if (result.size() > 255) {
return boost::optional<std::string>();
}
return result;
}
else {
return boost::optional<std::string>();
}
}
}
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Swift