The python scripts in this page and in the next one will try to save an uploaded file in a directory named files in the directory where it is running. If the directory where the script is running is /path/to/dir then the /path/to/dir/files directory must exist. If it does not it will fail.
To upload a file the HTML form must have the enctype attribute set to multipart/form-data. The input tag with the file type will create a “Browse” button.
The cgi.FieldStorage.getfirst() and cgi.FieldStorage.getlist() methods will only return the file(s) content. To also get the filename it is necessary to access a nested cgi.FieldStorage instance by its index in the top cgi.FieldStorage instance:
#!/usr/bin/env python
import cgi, os
import cgitb; cgitb.enable()
try: # Windows needs stdio set for binary mode.
import msvcrt
msvcrt.setmode (0, os.O_BINARY) # stdin = 0
msvcrt.setmode (1, os.O_BINARY) # stdout = 1
except ImportError:
pass
form = cgi.FieldStorage()
# A nested FieldStorage instance holds the file
fileitem = form['file']
# Test if the file was uploaded
if fileitem.filename:
# strip leading path from file name
# to avoid directory traversal attacks
fn = os.path.basename(fileitem.filename)
open('files/' + fn, 'wb').write(fileitem.file.read())
message = 'The file "' + fn + '" was uploaded successfully'
else:
message = 'No file was uploaded'
print """\
Content-Type: text/html\n
%s
""" % (message,)
http://cgi.tutorial.codepoint.net/file-upload