Major plugin refactor and cleanup.

Switched to POCO library for unified platform/library interface.
Deprecated the external module API. It was creating more problems than solving.
Removed most built-in libraries in favor of system libraries for easier maintenance.
Cleaned and secured code with help from static analyzers.

vendor/POCO/NetSSL_OpenSSL/include/Poco/Net/HTTPSClientSession.h

@@ -0,0 +1,165 @@
+//
+// HTTPSClientSession.h
+//
+// Library: NetSSL_OpenSSL
+// Package: HTTPSClient
+// Module:  HTTPSClientSession
+//
+// Definition of the HTTPSClientSession class.
+//
+// Copyright (c) 2006-2009, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef NetSSL_HTTPSClientSession_INCLUDED
+#define NetSSL_HTTPSClientSession_INCLUDED
+
+
+#include "Poco/Net/NetSSL.h"
+#include "Poco/Net/Utility.h"
+#include "Poco/Net/HTTPClientSession.h"
+#include "Poco/Net/Context.h"
+#include "Poco/Net/Session.h"
+#include "Poco/Net/X509Certificate.h"
+
+
+namespace Poco {
+namespace Net {
+
+
+class SecureStreamSocket;
+class HTTPRequest;
+class HTTPResponse;
+
+
+class NetSSL_API HTTPSClientSession: public HTTPClientSession
+	/// This class implements the client-side of
+	/// a HTTPS session.
+	///
+	/// To send a HTTPS request to a HTTPS server, first
+	/// instantiate a HTTPSClientSession object and
+	/// specify the server's host name and port number.
+	///
+	/// Then create a HTTPRequest object, fill it accordingly,
+	/// and pass it as argument to the sendRequest() method.
+	///
+	/// sendRequest() will return an output stream that can
+	/// be used to send the request body, if there is any.
+	///
+	/// After you are done sending the request body, create
+	/// a HTTPResponse object and pass it to receiveResponse().
+	///
+	/// This will return an input stream that can be used to
+	/// read the response body.
+	///
+	/// See RFC 2616 <http://www.faqs.org/rfcs/rfc2616.html> for more
+	/// information about the HTTP protocol.
+	///
+	/// Note that sending requests that neither contain a content length
+	/// field in the header nor are using chunked transfer encoding will
+	/// result in a SSL protocol violation, as the framework shuts down
+	/// the socket after sending the message body. No orderly SSL shutdown
+	/// will be performed in this case.
+	///
+	/// If session caching has been enabled for the Context object passed
+	/// to the HTTPSClientSession, the HTTPSClientSession class will
+	/// attempt to reuse a previously obtained Session object in
+	/// case of a reconnect.
+{
+public:
+	enum
+	{
+		HTTPS_PORT = 443
+	};
+	
+	HTTPSClientSession();
+		/// Creates an unconnected HTTPSClientSession.
+
+	explicit HTTPSClientSession(const SecureStreamSocket& socket);
+		/// Creates a HTTPSClientSession using the given socket.
+		/// The socket must not be connected. The session
+		/// takes ownership of the socket.
+
+	HTTPSClientSession(const SecureStreamSocket& socket, Session::Ptr pSession);
+		/// Creates a HTTPSClientSession using the given socket.
+		/// The socket must not be connected. The session
+		/// takes ownership of the socket.
+		///
+		/// The given Session is reused, if possible (client session
+		/// caching is enabled for the given Context, and the server
+		/// agrees to reuse the session).
+
+	HTTPSClientSession(const std::string& host, Poco::UInt16 port = HTTPS_PORT);
+		/// Creates a HTTPSClientSession using the given host and port.
+
+	explicit HTTPSClientSession(Context::Ptr pContext);
+		/// Creates an unconnected HTTPSClientSession, using the
+		/// give SSL context.
+
+	HTTPSClientSession(Context::Ptr pContext, Session::Ptr pSession);
+		/// Creates an unconnected HTTPSClientSession, using the
+		/// give SSL context.
+		///
+		/// The given Session is reused, if possible (client session
+		/// caching is enabled for the given Context, and the server
+		/// agrees to reuse the session).
+
+	HTTPSClientSession(const std::string& host, Poco::UInt16 port, Context::Ptr pContext);
+		/// Creates a HTTPSClientSession using the given host and port,
+		/// using the given SSL context.
+
+	HTTPSClientSession(const std::string& host, Poco::UInt16 port, Context::Ptr pContext, Session::Ptr pSession);
+		/// Creates a HTTPSClientSession using the given host and port,
+		/// using the given SSL context.
+		///
+		/// The given Session is reused, if possible (client session
+		/// caching is enabled for the given Context, and the server
+		/// agrees to reuse the session).
+
+	~HTTPSClientSession();
+		/// Destroys the HTTPSClientSession and closes
+		/// the underlying socket.
+	
+	bool secure() const;
+		/// Return true iff the session uses SSL or TLS,
+		/// or false otherwise.
+		
+	X509Certificate serverCertificate();
+		/// Returns the server's certificate.
+		///
+		/// The certificate is available after the first request has been sent.
+		
+	Session::Ptr sslSession();
+		/// Returns the SSL Session object for the current 
+		/// connection, if session caching has been enabled for
+		/// the HTTPSClientSession's Context. A null pointer is 
+		/// returned otherwise.
+		///
+		/// The Session object can be obtained after the first request has
+		/// been sent.
+		
+	// HTTPSession
+	void abort();
+
+protected:
+	void connect(const SocketAddress& address);
+	std::string proxyRequestPrefix() const;
+	void proxyAuthenticate(HTTPRequest& request);
+	int read(char* buffer, std::streamsize length);
+
+private:
+	HTTPSClientSession(const HTTPSClientSession&);
+	HTTPSClientSession& operator = (const HTTPSClientSession&);
+	
+	Context::Ptr _pContext;
+	Session::Ptr _pSession;
+};
+
+
+} } // namespace Poco::Net
+
+
+#endif // Net_HTTPSClientSession_INCLUDED