mirror of https://github.com/qpdf/qpdf.git
100 lines
3.4 KiB
C++
100 lines
3.4 KiB
C++
// Copyright (c) 2005-2024 Jay Berkenbilt
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//
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// This file is part of qpdf.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
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// in compliance with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under
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// the License.
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//
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// Versions of qpdf prior to version 7 were released under the terms of version 2.0 of the Artistic
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// License. At your option, you may continue to consider qpdf to be licensed under those terms.
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// Please see the manual for additional information.
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#ifndef QPDFCRYPTOPROVIDER_HH
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#define QPDFCRYPTOPROVIDER_HH
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#include <qpdf/DLL.h>
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#include <qpdf/QPDFCryptoImpl.hh>
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#include <functional>
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#include <map>
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#include <memory>
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#include <set>
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#include <string>
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// This class is part of qpdf's pluggable crypto provider support. Most users won't need to know or
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// care about this class, but you can use it if you want to supply your own crypto implementation.
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// See also comments in QPDFCryptoImpl.hh.
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class QPDFCryptoProvider
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{
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public:
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// Methods for getting and registering crypto implementations. These methods are not
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// thread-safe.
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// Return an instance of a crypto provider using the default implementation.
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QPDF_DLL
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static std::shared_ptr<QPDFCryptoImpl> getImpl();
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// Return an instance of the crypto provider registered using the given name.
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QPDF_DLL
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static std::shared_ptr<QPDFCryptoImpl> getImpl(std::string const& name);
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// Register the given type (T) as a crypto implementation. T must be derived from QPDFCryptoImpl
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// and must have a constructor that takes no arguments.
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template <typename T>
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QPDF_DLL static void registerImpl(std::string const& name);
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// Set the crypto provider registered with the given name as the default crypto implementation.
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QPDF_DLL
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static void setDefaultProvider(std::string const& name);
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// Get the names of registered implementations
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QPDF_DLL
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static std::set<std::string> getRegisteredImpls();
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// Get the name of the default crypto provider
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QPDF_DLL
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static std::string getDefaultProvider();
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private:
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QPDFCryptoProvider();
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~QPDFCryptoProvider() = default;
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QPDFCryptoProvider(QPDFCryptoProvider const&) = delete;
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QPDFCryptoProvider& operator=(QPDFCryptoProvider const&) = delete;
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static QPDFCryptoProvider& getInstance();
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std::shared_ptr<QPDFCryptoImpl> getImpl_internal(std::string const& name) const;
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template <typename T>
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void registerImpl_internal(std::string const& name);
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void setDefaultProvider_internal(std::string const& name);
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class Members
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{
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friend class QPDFCryptoProvider;
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public:
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Members() = default;
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QPDF_DLL
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~Members() = default;
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private:
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Members(Members const&) = delete;
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Members& operator=(Members const&) = delete;
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typedef std::function<std::shared_ptr<QPDFCryptoImpl>()> provider_fn;
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std::string default_provider;
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std::map<std::string, provider_fn> providers;
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};
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std::shared_ptr<Members> m;
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};
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#endif // QPDFCRYPTOPROVIDER_HH
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