import the first version of cmslu

git-svn-id: svn://ttmath.org/publicrep/cmslu/trunk@460 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/sessionmanager.cpp

@@ -0,0 +1,161 @@
+/*
+ * This file is a part of CMSLU -- Content Management System like Unix
+ * and is not publicly distributed
+ * 
+ * Copyright (c) 2008, Tomasz Sowa
+ * All rights reserved.
+ * 
+ */
+ 
+#include "sessionmanager.h"
+
+
+bool SessionManager::IsSession(long s)
+{
+	SessionTable::iterator i;
+	
+	Session temp;
+	
+	temp.id = s;
+	
+	i = session_table.find(temp);
+	
+	if( i == session_table.end() )
+		return false;
+	
+	
+
+return true;
+}
+
+
+long SessionManager::CreateSessionId()
+{
+long id;
+	
+	// make sure to call std::srand() somewhere at the beginning
+	// id must be != 0 (0 is reserved)
+	do
+	{
+		if( sizeof(long) == 8 )
+		{
+			id = ((unsigned long)std::rand()) << 32 + std::rand();
+		}
+		else
+		{
+			id = std::rand();
+		}
+		
+		id += std::time(0);
+		
+		if( id < 0 )
+			id = -id;
+		
+	}
+	while( id == 0 ); // 0 reserved for a temporary session
+
+	
+return id;
+}
+
+
+void SessionManager::CreateTemporarySession()
+{
+Session s;
+	
+	s.id = 0;
+	SessionTable::iterator i = session_table.find( s ); // looking for id=0
+	
+	if( i == session_table.end() )
+	{
+		std::pair<SessionTable::iterator,bool> res = session_table.insert(s);
+		request.session = const_cast<Session*>( &(*res.first) );
+	}
+	else
+	{
+		request.session = const_cast<Session*>( &(*i) );
+	}
+}
+
+
+void SessionManager::CreateSession()
+{
+Session s;
+int attempts = 100;
+
+	for( ; attempts > 0 ; --attempts )
+	{
+		s.id = CreateSessionId();
+	
+		std::pair<SessionTable::iterator,bool> res = session_table.insert(s);	
+
+		if( res.second == true )
+		{
+			// the insertion took place
+				
+			request.session = const_cast<Session*>( &(*res.first) );
+			request.SetCookie(data.http_session_id_name.c_str(), request.session->id);
+			log << log1 << "created a new session: " << s.id << logend;
+				
+		return;
+		}
+	}
+	
+	// there is a problem with generating a new session id
+	// we do not set a session cookie
+	CreateTemporarySession();
+	log << log1 << "cannot create a session id (temporary used: with id 0)" << logend;
+}
+
+
+
+void SessionManager::SetSession()
+{
+	CookieTable::iterator i = request.cookie_table.find(data.http_session_id_name);
+	
+	if( i == request.cookie_table.end() )
+	{
+		CreateSession();
+	}
+	else
+	{
+		Session temp;
+		temp.id = atol(i->second.c_str());
+		SessionTable::iterator s = session_table.find(temp);
+	
+		if( s != session_table.end() )
+		{
+			// that session is in the table
+			request.session = const_cast<Session*>( &(*s) );
+			log << log1 << "session: " << s->id << logend;
+		}
+		else
+		{
+			// there is no such a session
+			// deleting the old cookie
+			request.cookie_table.erase(i);
+
+			// and creating a new one
+			CreateSession();
+		}
+	}
+	
+	
+	
+	// request.session is set now
+}
+
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