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Web application mark 1 - 3 pages, sessions, hidden fields
Python on the Web example from a Well House Consultants training course
More on Python on the Web [link] Source code: hsapp1.py Module: Y202
#!/usr/bin/env python
# This is MARK 1. Please see MARK 2 for more secure version # *** Need to add # * Handlers for error messages to make debugging easier # * Sticky fields (to allow for bad entries to be corrected) # * Users who enter "nasty" characters such as < into fields # * Deleting of sessions once the application is completed # * Tidying up old session files import cgi import re import marshal import time # Convert inputs (from form) into fill (on next page) # Stores information in session (held as an object) inputs = {} trace = "" gotten = cgi.FieldStorage() for key in gotten: inputs[key] = gotten[key].value # Load or set up session ######################## sessid = inputs.get("pysession","0") if sessid != "0": session = {} fh = open("../../pysessions/"+sessid,"r") session = marshal.loads(fh.read()) fh.close() else: sessid = "hsa"+ ("%.4f"%time.time())+".sess" session = {} fill = session fill["pysession"] = sessid fill["error"] = "" stage = session.get("stage","0") # finish up from the inputs from the previous page ################################################## if stage == "0": stage = "1" elif stage == "1": # surname entered musthaveletters = re.compile(r'\w') if musthaveletters.match(inputs.get("surname","")): stage = "2" session["surname"] = inputs["surname"] else: fill["error"] = "YOU MUST GIVE A SURNAME starting with a letter!" elif stage == "2": # email address entered musthaveat = re.compile(r'@') if musthaveat.search(inputs.get("email","")): stage = "3" session["email"] = inputs["email"] else: fill["error"] = "WE REQUIRE AN EMAIL ADDRESS WITH AN @ IN IT" else: pass # prepare for the next page ########################### fill["reportstage"] = stage if stage == "1": fill["ask"] = "<tr><td>surname</td><td><input name=surname></td><tr>" fill["result"] = "You are at stage 1 in our system" elif stage == "2": fill["ask"] = "<tr><td>email</td><td><input name=email></td><tr>" fill["result"] = "You have put in your name and are at stage 2 in our system" else: fill["ask"] = "" fill["result"] = "You have told us all we need to know and are past stage 3" fill["result"] += """<hr><b>At this stage you are completed. We recall that your surname is <u>"""+ session["surname"] + """</u> and that your email address is <u>"""+ session["email"] + """</u></b>""" stage = "0" session["stage"] = stage # Save session ready for next page ################################## fh = open("../../pysessions/"+sessid,"w") fh.write(marshal.dumps(session)) fh.close() # Send out response page ######################## print "content-type: text/html\n" fh = open("hsdemo.htp","r") for line in fh.readlines(): for item in fill.keys(): replace = re.compile("%"+item+"%") line = re.sub(replace,fill[item],line) print line, Learn about this subject
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