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/*
 * Copyright (c) 2010 Remko Tronçon
 * Licensed under the GNU General Public License v3.
 * See Documentation/Licenses/GPLv3.txt for more information.
 */

#include <cppunit/extensions/HelperMacros.h>
#include <cppunit/extensions/TestFactoryRegistry.h>
#include <deque>
#include <boost/bind.hpp>
#include <boost/optional.hpp>

#include <Swiften/Session/SessionStream.h>
#include <Swiften/Component/ComponentSession.h>
#include <Swiften/Elements/ComponentHandshake.h>
#include <Swiften/Elements/AuthFailure.h>

using namespace Swift;

class ComponentSessionTest : public CppUnit::TestFixture {
		CPPUNIT_TEST_SUITE(ComponentSessionTest);
		CPPUNIT_TEST(testStart);
		CPPUNIT_TEST(testStart_Error);
		CPPUNIT_TEST(testStart_Unauthorized);
		CPPUNIT_TEST_SUITE_END();

	public:
		void setUp() {
			server = boost::make_shared<MockSessionStream>();
			sessionFinishedReceived = false;
		}

		void testStart() {
			boost::shared_ptr<ComponentSession> session(createSession());
			session->start();
			server->receiveStreamStart();
			server->sendStreamStart();
			server->receiveHandshake();
			server->sendHandshakeResponse();

			CPPUNIT_ASSERT(server->whitespacePingEnabled);

			session->finish();
			CPPUNIT_ASSERT(!server->whitespacePingEnabled);

		}

		void testStart_Error() {
			boost::shared_ptr<ComponentSession> session(createSession());
			session->start();
			server->breakConnection();

			CPPUNIT_ASSERT_EQUAL(ComponentSession::Finished, session->getState());
			CPPUNIT_ASSERT(sessionFinishedReceived);
			CPPUNIT_ASSERT(sessionFinishedError);
		}

		void testStart_Unauthorized() {
			boost::shared_ptr<ComponentSession> session(createSession());
			session->start();
			server->receiveStreamStart();
			server->sendStreamStart();
			server->receiveHandshake();
			server->sendHandshakeError();

			CPPUNIT_ASSERT_EQUAL(ComponentSession::Finished, session->getState());
			CPPUNIT_ASSERT(sessionFinishedReceived);
			CPPUNIT_ASSERT(sessionFinishedError);
		}

	private:
		boost::shared_ptr<ComponentSession> createSession() {
			boost::shared_ptr<ComponentSession> session = ComponentSession::create(JID("service.foo.com"), "servicesecret", server);
			session->onFinished.connect(boost::bind(&ComponentSessionTest::handleSessionFinished, this, _1));
			return session;
		}

		void handleSessionFinished(boost::shared_ptr<Error> error) {
			sessionFinishedReceived = true;
			sessionFinishedError = error;
		}

		class MockSessionStream : public SessionStream {
			public:
				struct Event {
					Event(boost::shared_ptr<Element> element) : element(element), footer(false) {}
					Event(const ProtocolHeader& header) : header(header), footer(false) {}
					Event() : footer(true) {}
					
					boost::shared_ptr<Element> element;
					boost::optional<ProtocolHeader> header;
					bool footer;
				};

				MockSessionStream() : available(true), whitespacePingEnabled(false), resetCount(0) {
				}

				virtual void close() {
					onClosed(boost::shared_ptr<Error>());
				}

				virtual bool isOpen() {
					return available;
				}

				virtual void writeHeader(const ProtocolHeader& header) {
					receivedEvents.push_back(Event(header));
				}

				virtual void writeFooter() {
					receivedEvents.push_back(Event());
				}

				virtual void writeElement(boost::shared_ptr<Element> element) {
					receivedEvents.push_back(Event(element));
				}

				virtual void writeData(const std::string&) {
				}

				virtual bool supportsTLSEncryption() {
					return false;
				}

				virtual void addTLSEncryption() {
					assert(false);
				}

				virtual bool isTLSEncrypted() {
					return false;
				}

				virtual ByteArray getTLSFinishMessage() const {
					return ByteArray();
				}

				virtual Certificate::ref getPeerCertificate() const {
					return Certificate::ref();
				}

				virtual boost::shared_ptr<CertificateVerificationError> getPeerCertificateVerificationError() const {
					return boost::shared_ptr<CertificateVerificationError>();
				}

				virtual bool supportsZLibCompression() {
					return true;
				}

				virtual void addZLibCompression() {
					assert(false);
				}

				virtual void setWhitespacePingEnabled(bool enabled) {
					whitespacePingEnabled = enabled;
				}

				virtual void resetXMPPParser() {
					resetCount++;
				}

				void breakConnection() {
					onClosed(boost::make_shared<SessionStream::SessionStreamError>(SessionStream::SessionStreamError::ConnectionReadError));
				}

				void sendStreamStart() {
					ProtocolHeader header;
					header.setFrom("service.foo.com");
					return onStreamStartReceived(header);
				}

				void sendHandshakeResponse() {
					onElementReceived(ComponentHandshake::ref(new ComponentHandshake()));
				}

				void sendHandshakeError() {
					// FIXME: This isn't the correct element
					onElementReceived(AuthFailure::ref(new AuthFailure()));
				}

				void receiveStreamStart() {
					Event event = popEvent();
					CPPUNIT_ASSERT(event.header);
				}

				void receiveHandshake() {
					Event event = popEvent();
					CPPUNIT_ASSERT(event.element);
					ComponentHandshake::ref handshake(boost::dynamic_pointer_cast<ComponentHandshake>(event.element));
					CPPUNIT_ASSERT(handshake);
					CPPUNIT_ASSERT_EQUAL(std::string("4c4f8a41141722c8bbfbdd92d827f7b2fc0a542b"), handshake->getData());
				}

				Event popEvent() {
					CPPUNIT_ASSERT(!receivedEvents.empty());
					Event event = receivedEvents.front();
					receivedEvents.pop_front();
					return event;
				}

				bool available;
				bool whitespacePingEnabled;
				std::string bindID;
				int resetCount;
				std::deque<Event> receivedEvents;
		};

		boost::shared_ptr<MockSessionStream> server;
		bool sessionFinishedReceived;
		bool needCredentials;
		boost::shared_ptr<Error> sessionFinishedError;
};

CPPUNIT_TEST_SUITE_REGISTRATION(ComponentSessionTest);