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CS320 Web and Internet Programming Cookies and Session Tracking

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CS320 Web and Internet Programming Cookies and Session Tracking. Chengyu Sun California State University, Los Angeles. Session Tracking. The Need shopping cart, personalization, ... The Difficulty HTTP is a “stateless” protocol Even persistent connections only last seconds The Trick??.

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CS320 Web and Internet Programming Cookies and Session Tracking

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  1. CS320 Web and Internet ProgrammingCookies and Session Tracking Chengyu Sun California State University, Los Angeles

  2. Session Tracking • The Need • shopping cart, personalization, ... • The Difficulty • HTTP is a “stateless” protocol • Even persistent connections only last seconds • The Trick??

  3. General Idea request client server response + session id (sid) request + sid request + sid request + sid request + sid

  4. Three Ways to Implement Session Tracking • URL Re-writing • Hidden form field • Cookies

  5. Example: Shopping Cart (I) • Using URL re-writing • Using hidden form field

  6. Cookies • Issued by the server • HTTP Response: Set-Cookie • Part of the next client request • HTTP Request: Cookie

  7. Cookie Attributes • Name, Value • Host/Domain, Path • Require secure connection • Max age • Comment (Version 1)

  8. Servlet Cookie API • Cookie • getThis(), setThat() ... • setMaxAge( int ) • 1000??, -1??, 0?? • HttpServletResponse • addCookie( Cookie ) • HttpServletRequest • Cookie[] getCookies()

  9. Example: Shopping Cart (II) • Using Cookie

  10. Cookie or No Cookie? • Is cookie a potential security problem? • Virus?? • DoS?? • How about privacy? • Cookie manager in Mozilla/Firefox(?) • Internet Options in IE

  11. It’s Not Easy ... • ... to generate unique and random session id’s • ... to associate more information with a session • ... to tell whether the client has already left

  12. Servlet Session Tracking API • HttpServletRequest • HttpSession getSession() • HttpSession • setAttribute( String, Object ) • getAttribute( String ) • setMaxInactiveInterval( int ) • Tomcat default: 30 seconds • invalidate()

  13. Example: Shopping Cart (III) • Using Session Tracking API

  14. Is Session Shared Across Multiple Servlets? Example: Members Only! Username: Password: LoginServlet DisplayServlet

  15. Is Session Shared Across Multiple Servlets? • LoginServlet • Validate username and password • Failed: redirect to error page • Succeeded: set a session attribute “authenticated” to “true”, and redirect to DisplayServlet • DisplayServlet • Check session attribute “authenticated” • null: redirect to LoginServlet • “true”: display content

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