Loadosenvironhttpcookie except keyerror except

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Unformatted text preview: s, it could be from the same person who made the previous one, or maybe not. • An connected set of interactions must somehow implement – persistence (information that is remembered) – identity (an ID to something like it) CS 206 G. Dudek 130 Cookies • How to correlate sessions from the same user? sessions – Store "cookie" in browser » controversial, but useful – Module: Cookie.py (Tim O'Malley) py (T » writes "Set-Cookie" headers » parses HTTP_COOKIE environment variable – Note: using cookies affects our debug framework » cookies must be printed as part of HTTP headers » cheapest solution: » move printing of blank line into worker module » (and into exception handler of debug framework) CS 206 G. Dudek 131 Cookie example import os, cgi, Cookie import os cgi c = Cookie.Cookie() try: c["user"] = user print c c.load(os.environ["HTTP_COOKIE"]) except KeyError: except KeyError pass print """ <form action="/cgi-bin/test.py" method="get"> <input type="text" name="user" value="%s"> form = cgi.FieldStorage() form cgi </form> try: """ % cgi.escape(user) """ cgi user = form["user"].value except KeyError: except KeyError try: user = c["user"].value except KeyError: KeyError user = "nobody" # debug: show the cookie header we wrote print "<pre>" print cgi.escape(str(c)) print cgi print "</pre>" CS 206 G. Dudek 132 File upload example import cgi import cgi form = cgi.FieldStorage() form cgi if not form: print """ <form action="/cgi-bin/test.py" method="POST" enctype="multipart/form-data"> enctype <input type="file" name="filename"> type="file" <input type="submit"> </form> """ elif form.has_key("filename"): elif form.has_key("filename"): item = form["filename"] if item.file: data = item.file.read() # read cont...
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