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/* Copyright 2012 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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.
*/
#pragma once
#include <iosfwd>
#include <memory>
#include <string>
#include "mongo/base/disallow_copying.h"
#include "mongo/base/string_data.h"
namespace mongo {
/**
* Representation of a name of a principal (authenticatable user) in a MongoDB system.
*
* Consists of a "user name" part, and a "database name" part.
*/
class UserName {
public:
UserName() : _splitPoint(0) {}
UserName(StringData user, StringData dbname);
/**
* Gets the user part of a UserName.
*/
StringData getUser() const {
return StringData(_fullName).substr(0, _splitPoint);
}
/**
* Gets the database name part of a UserName.
*/
StringData getDB() const {
return StringData(_fullName).substr(_splitPoint + 1);
}
/**
* Gets the full unique name of a user as a string, formatted as "user@db".
*/
const std::string& getFullName() const {
return _fullName;
}
/**
* Stringifies the object, for logging/debugging.
*/
std::string toString() const {
return getFullName();
}
bool operator==(const UserName& rhs) const {
return _splitPoint == rhs._splitPoint && getFullName() == rhs.getFullName();
}
bool operator!=(const UserName& rhs) const {
return _splitPoint != rhs._splitPoint || getFullName() != rhs.getFullName();
}
bool operator<(const UserName& rhs) const {
return getUser() < rhs.getUser() || (getUser() == rhs.getUser() && getDB() < rhs.getDB());
}
private:
std::string _fullName; // The full name, stored as a string. "user@db".
size_t _splitPoint; // The index of the "@" separating the user and db name parts.
};
std::ostream& operator<<(std::ostream& os, const UserName& name);
/**
* Iterator over an unspecified container of UserName objects.
*/
class UserNameIterator {
public:
class Impl {
MONGO_DISALLOW_COPYING(Impl);
public:
Impl(){};
virtual ~Impl(){};
static Impl* clone(Impl* orig) {
return orig ? orig->doClone() : NULL;
}
virtual bool more() const = 0;
virtual const UserName& get() const = 0;
virtual const UserName& next() = 0;
private:
virtual Impl* doClone() const = 0;
};
UserNameIterator() : _impl(nullptr) {}
UserNameIterator(const UserNameIterator& other) : _impl(Impl::clone(other._impl.get())) {}
explicit UserNameIterator(Impl* impl) : _impl(impl) {}
UserNameIterator& operator=(const UserNameIterator& other) {
_impl.reset(Impl::clone(other._impl.get()));
return *this;
}
bool more() const {
return _impl.get() && _impl->more();
}
const UserName& get() const {
return _impl->get();
}
const UserName& next() {
return _impl->next();
}
const UserName& operator*() const {
return get();
}
const UserName* operator->() const {
return &get();
}
private:
std::unique_ptr<Impl> _impl;
};
template <typename ContainerIterator>
class UserNameContainerIteratorImpl : public UserNameIterator::Impl {
MONGO_DISALLOW_COPYING(UserNameContainerIteratorImpl);
public:
UserNameContainerIteratorImpl(const ContainerIterator& begin, const ContainerIterator& end)
: _curr(begin), _end(end) {}
virtual ~UserNameContainerIteratorImpl() {}
virtual bool more() const {
return _curr != _end;
}
virtual const UserName& next() {
return *(_curr++);
}
virtual const UserName& get() const {
return *_curr;
}
virtual UserNameIterator::Impl* doClone() const {
return new UserNameContainerIteratorImpl(_curr, _end);
}
private:
ContainerIterator _curr;
ContainerIterator _end;
};
template <typename ContainerIterator>
UserNameIterator makeUserNameIterator(const ContainerIterator& begin,
const ContainerIterator& end) {
return UserNameIterator(new UserNameContainerIteratorImpl<ContainerIterator>(begin, end));
}
template <typename Container>
UserNameIterator makeUserNameIteratorForContainer(const Container& container) {
return makeUserNameIterator(container.begin(), container.end());
}
} // namespace mongo
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