CGI with Python

Question

I'm beginning to use CGI with Python.

After running the following piece of code:

#!c:\python34\python.exe

import cgi


print("Content-type: text/html\n\n") #important


def getData():
    formData = cgi.FieldStorage()
    InputUN = formData.getvalue('username')
    InputPC = formData.getvalue('passcode')
    TF = open("TempFile.txt", "w")
    TF.write(InputUN)
    TF.write(InputPC)
    TF.close()

if __name__ =="__main__":
    LoginInput = getData()
    print("cgi worked")

The following error occurs:

Traceback (most recent call last):
  File "C:\xampp\htdocs\actual\loginvalues.cgi", line 21, in <module>
    LoginInput = getData()
  File "C:\xampp\htdocs\actual\loginvalues.cgi", line 16, in getData
    TF.write(InputUN)
TypeError: must be str, not None
>>>

I'm trying to write the values, inputted in html, to a text file.

Any help would be appreciated :)

Did you try this stackoverflow.com/questions/8891245/get-form-data-using-python ? — Juan Fco. Roco
– Juan Fco. Roco, Commented Jan 25, 2015 at 3:23

Pi Marillion · Accepted Answer · 2015-01-28 02:36:12Z

Your calls to getValue() are returning None, meaning the form either didn't contain them, had them set to an empty string, or had them set by name only. Python's CGI module ignores inputs that aren't set to a non-null string.

Works for Python CGI:

mysite.com/loginvalues.cgi?username=myname&pass=mypass

Doesn't work for Python CGI:

mysite.com/loginvalues.cgi?username=&pass= (null value(s))
mysite.com/loginvalues.cgi?username&pass (Python requires the = part.)

To account for this, introduce a default value for when a form element is missing, or handle the None case manually:

TF.write('anonymous' if InputUN is None else InputUN)
TF.write('password' if InputPC is None else InputUN)

As a note, passwords and other private login credentials should never be used in a URL. URLs are not encrypted. Even in HTTPS, the URL is sent in plain text that anyone on the network(s) between you and your users can read.

The only time a URL is ever encrypted is over a tunneled SSH port or an encrypted VPN, but you can't control that, so never bank on it.

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