From 2de41856a0fe2181c0adb7ac1d7cf06037113775 Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Sun, 3 Nov 2019 20:36:53 -0500
Subject: QPDFCryptoProvider: initial implementation

---
 libqpdf/QPDFCryptoProvider.cc | 76 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 libqpdf/QPDFCryptoProvider.cc

(limited to 'libqpdf/QPDFCryptoProvider.cc')

diff --git a/libqpdf/QPDFCryptoProvider.cc b/libqpdf/QPDFCryptoProvider.cc
new file mode 100644
index 00000000..8d795534
--- /dev/null
+++ b/libqpdf/QPDFCryptoProvider.cc
@@ -0,0 +1,76 @@
+#include <qpdf/QPDFCryptoProvider.hh>
+#include <stdexcept>
+
+#include <qpdf/QPDFCrypto_native.hh>
+
+std::shared_ptr<QPDFCryptoImpl>
+QPDFCryptoProvider::getImpl()
+{
+    QPDFCryptoProvider& p = getInstance();
+    if (p.m->default_provider.empty())
+    {
+        throw std::logic_error(
+            "QPDFCryptoProvider::getImpl called with no default provider.");
+    }
+    return p.getImpl_internal(p.m->default_provider);
+}
+
+std::shared_ptr<QPDFCryptoImpl>
+QPDFCryptoProvider::getImpl(std::string const& name)
+{
+    return getInstance().getImpl_internal(name);
+}
+
+template<typename T>
+void
+QPDFCryptoProvider::registerImpl(std::string const& name)
+{
+    getInstance().registerImpl_internal<T>(name);
+}
+
+void
+QPDFCryptoProvider::setDefaultProvider(std::string const& name)
+{
+    getInstance().setDefaultProvider_internal(name);
+}
+
+QPDFCryptoProvider::QPDFCryptoProvider() :
+    m(std::make_shared<Members>())
+{
+    registerImpl_internal<QPDFCrypto_native>("native");
+    setDefaultProvider_internal("native");
+}
+
+QPDFCryptoProvider&
+QPDFCryptoProvider::getInstance()
+{
+    static QPDFCryptoProvider instance;
+    return instance;
+}
+
+std::shared_ptr<QPDFCryptoImpl>
+QPDFCryptoProvider::getImpl_internal(std::string const& name) const
+{
+    auto iter = this->m->providers.find(name);
+    if (iter == this->m->providers.end())
+    {
+        throw std::logic_error(
+            "QPDFCryptoProvider requested unknown implementation \"" +
+            name + "\"");
+    }
+    return this->m->providers[name]();
+}
+
+template<typename T>
+void
+QPDFCryptoProvider::registerImpl_internal(std::string const& name)
+{
+    this->m->providers[name] = std::make_shared<T>;
+
+}
+
+void
+QPDFCryptoProvider::setDefaultProvider_internal(std::string const& name)
+{
+    this->m->default_provider = name;
+}
-- 
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