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CGI programming

CGI programming. Peter Verh á s January 2002. What this tutorial is about. Introduction to CGI programming Using ScriptBasic Simple to program Simple to setup on Linux or any Win Prerequisite: understanding web architecture. How to setup ScriptBasic web test environment ?.

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CGI programming

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  1. CGI programming Peter Verhás January 2002

  2. What this tutorial is about • Introduction to CGI programming • Using ScriptBasic • Simple to program • Simple to setup on Linux or any Win • Prerequisite: understanding web architecture

  3. How to setup ScriptBasic web test environment? • Install ScriptBasic • Edit the configuration file • scriba.conf.lsp • Compile it using cftc.exe • Start sbhttpd • Start your browser (Well, this is not true CGI, but does not matter)

  4. How is CGI Working? • A new process on the web server • The CGI process reads stdin and environment variables • It writes the stdout

  5. Hello World! #! /usr/bin/scriba -c include cgi.bas cgi::Header 200,"text/html" cgi::FinishHeader print """<HTML> <BODY> Hello World! </BODY> </HTML> """ stop

  6. Which Environment Variables? • Important environment variables (from the http header) • REMOTE_ADDR 127.0.0.1 • REQUEST_METHOD GET • REMOTE_HOST localhost • HTTP_USER_AGENT Mozilla/4.0 • HTTP_ACCEPT */* • HTTP_CONNECTION Keep-Alive • HTTP_ACCEPT_LANGUAGE hu • SCRIPT_NAME test.bas • SERVER_NAME localhost • SERVER_PORT 80 • CONTENT_LENGTH 0 • QUERY_STRING q=verh%E1s+%2BCGI • PATH_TRANSLATED /home/httpd/cgi-bin/test.bas

  7. Print Out Environment Variables #! /usr/bin/scriba -c include cgi.bas cgi::Header 200,"text/html" cgi::FinishHeader print """<HTML> <BODY> <PRE> """ i = 0 while IsDefined( Environ(i) ) print i," ",Environ(i),"\n" i = i+1 wend print """</PRE> </BODY> </HTML> """ stop

  8. What is in the QUERY_STRING? • Anything that the browser sends • A FORM parameters coded • parameter=valuepairs joined with & • Space replaced by + • Special characters %XXhexa encoded

  9. Print Out QUERY_STRING #! /usr/bin/scriba -c include cgi.bas cgi::Header 200,"text/html" cgi::FinishHeader print """<HTML> <BODY> <PRE> """ print Environ("QUERY_STRING") print """</PRE> </BODY> </HTML> """ stop

  10. Getting Parameters #! /usr/bin/scriba -c include cgi.bas cgi::Header 200,"text/html" cgi::FinishHeader print """<HTML> <BODY> <PRE> """ print cgi::GetParam("apple") print """</PRE> </BODY> </HTML> """ stop

  11. Getting Parameters #! /usr/bin/scriba -c include cgi.bas cgi::Header 200,"text/html" cgi::FinishHeader print """<HTML> <BODY> <PRE> <FORM METHOD="POST"> <INPUT TYPE="TEXT" NAME="apple"> </FORM> """ print cgi::PostParam("apple") print """</PRE> </BODY> </HTML> """ stop

  12. Handling Cookies

  13. File Upload

  14. User Authentication

  15. Thank you for your attention.

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