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// Copyright (c) 2005-2022 Jay Berkenbilt
//
// This file is part of qpdf.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Versions of qpdf prior to version 7 were released under the terms
// of version 2.0 of the Artistic License. At your option, you may
// continue to consider qpdf to be licensed under those terms. Please
// see the manual for additional information.
#ifndef QPDFCRYPTOPROVIDER_HH
#define QPDFCRYPTOPROVIDER_HH
#include <qpdf/DLL.h>
#include <qpdf/QPDFCryptoImpl.hh>
#include <functional>
#include <map>
#include <memory>
#include <set>
#include <string>
// This class is part of qpdf's pluggable crypto provider support.
// Most users won't need to know or care about this class, but you can
// use it if you want to supply your own crypto implementation. See
// also comments in QPDFCryptoImpl.hh.
class QPDFCryptoProvider
{
public:
// Methods for getting and registering crypto implementations.
// These methods are not thread-safe.
// Return an instance of a crypto provider using the default
// implementation.
QPDF_DLL
static std::shared_ptr<QPDFCryptoImpl> getImpl();
// Return an instance of the crypto provider registered using the
// given name.
QPDF_DLL
static std::shared_ptr<QPDFCryptoImpl> getImpl(std::string const& name);
// Register the given type (T) as a crypto implementation. T must
// be derived from QPDFCryptoImpl and must have a constructor that
// takes no arguments.
template <typename T>
QPDF_DLL static void registerImpl(std::string const& name);
// Set the crypto provider registered with the given name as the
// default crypto implementation.
QPDF_DLL
static void setDefaultProvider(std::string const& name);
// Get the names of registered implementations
QPDF_DLL
static std::set<std::string> getRegisteredImpls();
// Get the name of the default crypto provider
QPDF_DLL
static std::string getDefaultProvider();
private:
QPDFCryptoProvider();
~QPDFCryptoProvider() = default;
QPDFCryptoProvider(QPDFCryptoProvider const&) = delete;
QPDFCryptoProvider& operator=(QPDFCryptoProvider const&) = delete;
static QPDFCryptoProvider& getInstance();
std::shared_ptr<QPDFCryptoImpl>
getImpl_internal(std::string const& name) const;
template <typename T>
void registerImpl_internal(std::string const& name);
void setDefaultProvider_internal(std::string const& name);
class Members
{
friend class QPDFCryptoProvider;
public:
Members() = default;
QPDF_DLL
~Members() = default;
private:
Members(Members const&) = delete;
Members& operator=(Members const&) = delete;
typedef std::function<std::shared_ptr<QPDFCryptoImpl>()> provider_fn;
std::string default_provider;
std::map<std::string, provider_fn> providers;
};
std::shared_ptr<Members> m;
};
#endif // QPDFCRYPTOPROVIDER_HH
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