2010-09-01 17:39:46 -06:00
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#! /usr/bin/lua
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2010-03-02 20:45:21 -07:00
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2010-09-01 17:39:46 -06:00
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function decode(str)
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local hexdec = function(h)
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return string.char(tonumber(h, 16))
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end
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str = string.gsub(str, "+", " ")
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return string.gsub(str, "%%(%x%x)", hexdec)
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end
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2010-03-02 20:45:21 -07:00
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2010-09-01 17:39:46 -06:00
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function decode_query(query)
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local ret = {}
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for key, val in string.gfind(query, "([^&=]+)=([^&=]+)") do
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ret[string.lower(decode(key))] = decode(val)
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end
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return ret
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end
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2010-03-02 20:45:21 -07:00
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2010-09-01 17:39:46 -06:00
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function escape(str)
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str = string.gsub(str, "&", "&")
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str = string.gsub(str, "<", "<")
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str = string.gsub(str, ">", ">")
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return str
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end
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2010-03-02 20:45:21 -07:00
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2010-09-01 17:39:46 -06:00
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function djbhash(s)
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local hash = 5380
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for i=0,string.len(s) do
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local c = string.byte(string.sub(s, i, i+1))
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hash = math.mod(((hash * 32) + hash + c), 2147483647)
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end
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return string.format("%08x", hash)
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end
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2010-03-02 20:45:21 -07:00
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2010-09-01 17:39:46 -06:00
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function head(title)
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print("Content-type: text/html")
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print("")
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print("<!DOCTYPE html>")
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print("<html>")
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print(" <head>")
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print(" <title>")
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print(title)
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print(" </title")
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print(' <link rel="stylesheet" href="ctf.css" type="text/css">')
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print(" </head>")
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print(" <body>")
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print(" <h1>")
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print(title)
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print(" </h1>")
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end
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2010-03-02 20:45:21 -07:00
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2010-09-01 17:39:46 -06:00
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function foot()
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print(" </body>")
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print("</html>")
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os.exit()
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end
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2010-03-02 20:45:21 -07:00
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2010-09-01 17:39:46 -06:00
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if (os.getenv("REQUEST_METHOD") ~= "POST") then
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print("405 Method not allowed")
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print("Allow: POST")
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print("Content-type: text/html")
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print()
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print("<h1>Method not allowed</h1>")
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print("<p>I only speak POST. Sorry.</p>")
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end
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2010-03-02 20:45:21 -07:00
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2010-09-01 17:39:46 -06:00
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inlen = tonumber(os.getenv("CONTENT_LENGTH"))
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if (inlen > 200) then
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head("Bad team name")
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print("<p>That's a bit on the long side, don't you think?</p>")
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foot()
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end
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formdata = io.read(inlen)
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f = decode_query(formdata)
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2010-03-02 20:45:21 -07:00
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2010-09-01 17:39:46 -06:00
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team = f["t"]
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if (not team) or (team == "dirtbags") then
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head("Bad team name")
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print("<p>Go back and try again.</p>")
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foot()
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end
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hash = djbhash(team)
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2010-03-02 20:45:21 -07:00
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2010-09-01 17:39:46 -06:00
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if io.open(hash) then
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head("Team name taken")
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print("<p>Either someone's already using that team name,")
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print("or you found a hash collision. Either way, you're")
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print("going to have to pick something else.</p>")
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foot()
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end
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2010-03-02 20:45:21 -07:00
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2010-09-01 17:39:46 -06:00
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f = io.open(hash, "w"):write(team)
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2010-03-02 20:45:21 -07:00
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2010-09-01 17:39:46 -06:00
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head("Team registered")
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print("<p>Team name: <samp>")
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print(escape(team))
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print("</samp></p>")
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print("<p>Team token: <samp>")
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print(hash)
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print("</samp></p>")
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print("<p><b>Save your team token somewhere</b>!")
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print("You will need it to claim points.</p>")
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foot()
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