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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/util/icu.h"
#include <memory>
#include <unicode/localpointer.h>
#include <unicode/putil.h>
#include <unicode/uiter.h>
#include <unicode/unistr.h>
#include <unicode/usprep.h>
#include <unicode/ustring.h>
#include <unicode/utypes.h>
#include <vector>
#include "mongo/util/assert_util.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
namespace {
/**
* Convenience wrapper for a UChar[] string.
* Instantiate with UString::fromUTF8() and reseriealize with ustr.toUTF8()
*/
class UString {
public:
UString() = delete;
explicit UString(size_t size) {
_str.resize(size);
}
const UChar* uc_str() const {
return _str.data();
}
UChar* data() {
return _str.data();
}
size_t capacity() const {
return _str.capacity();
}
size_t size() const {
return _str.size();
}
void resize(size_t len) {
_str.resize(len);
}
static UString fromUTF8(StringData str) {
UErrorCode error = U_ZERO_ERROR;
int32_t len = 0;
u_strFromUTF8(nullptr, 0, &len, str.rawData(), str.size(), &error);
uassert(ErrorCodes::BadValue, "Non UTF-8 data encountered", error != U_INVALID_CHAR_FOUND);
uassert(50687,
str::stream() << "Error preflighting UTF-8 conversion: " << u_errorName(error),
error == U_BUFFER_OVERFLOW_ERROR);
error = U_ZERO_ERROR;
UString ret(len);
u_strFromUTF8(ret.data(), ret.capacity(), &len, str.rawData(), str.size(), &error);
uassert(50688,
str::stream() << "Error converting UTF-8 string: " << u_errorName(error),
U_SUCCESS(error));
ret.resize(len);
return ret;
}
std::string toUTF8() const {
UErrorCode error = U_ZERO_ERROR;
int32_t len = 0;
u_strToUTF8(nullptr, 0, &len, _str.data(), _str.size(), &error);
uassert(50689,
str::stream() << "Error preflighting UTF-8 conversion: " << u_errorName(error),
error == U_BUFFER_OVERFLOW_ERROR);
error = U_ZERO_ERROR;
std::string ret;
ret.resize(len);
u_strToUTF8(&ret[0], ret.capacity(), &len, _str.data(), _str.size(), &error);
uassert(50690,
str::stream() << "Error converting string to UTF-8: " << u_errorName(error),
U_SUCCESS(error));
ret.resize(len);
return ret;
}
private:
std::vector<UChar> _str;
};
/**
* Convenience wrapper for ICU unicode string prep API.
*/
class USPrep {
public:
USPrep() = delete;
USPrep(UStringPrepProfileType type) {
UErrorCode error = U_ZERO_ERROR;
_profile.reset(usprep_openByType(type, &error));
uassert(50691,
str::stream() << "Unable to open unicode string prep profile: "
<< u_errorName(error),
U_SUCCESS(error));
}
UString prepare(const UString& src, int32_t options = USPREP_DEFAULT) {
UErrorCode error = U_ZERO_ERROR;
auto len = usprep_prepare(
_profile.get(), src.uc_str(), src.size(), nullptr, 0, options, nullptr, &error);
uassert(ErrorCodes::BadValue,
"Unable to normalize input string",
error != U_INVALID_CHAR_FOUND);
uassert(50692,
str::stream() << "Error preflighting normalization: " << u_errorName(error),
error == U_BUFFER_OVERFLOW_ERROR);
error = U_ZERO_ERROR;
UString ret(len);
len = usprep_prepare(_profile.get(),
src.uc_str(),
src.size(),
ret.data(),
ret.capacity(),
options,
nullptr,
&error);
uassert(50693,
str::stream() << "Failed normalizing string: " << u_errorName(error),
U_SUCCESS(error));
ret.resize(len);
return ret;
}
private:
class USPrepDeleter {
public:
void operator()(UStringPrepProfile* profile) {
usprep_close(profile);
}
};
std::unique_ptr<UStringPrepProfile, USPrepDeleter> _profile;
};
} // namespace
StatusWith<std::string> icuSaslPrep(StringData str, UStringPrepOptions options) try {
const auto opts = (options == kUStringPrepDefault) ? USPREP_DEFAULT : USPREP_ALLOW_UNASSIGNED;
return USPrep(USPREP_RFC4013_SASLPREP).prepare(UString::fromUTF8(str), opts).toUTF8();
} catch (const DBException& e) {
return e.toStatus();
}
StatusWith<std::string> icuX509DNPrep(StringData str) try {
return USPrep(USPREP_RFC4518_LDAP).prepare(UString::fromUTF8(str), USPREP_DEFAULT).toUTF8();
} catch (const DBException& e) {
return e.toStatus();
}
} // namespace mongo
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