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I would like to upload multiple files using a single form field via Python CGI script using the code here. Newer browsers seem to support this feature per here and here. The HTML form seems straightforward:
<input name="file" type="file" multiple="" />
Using this form to select two files name file0 and file1 will result in the following per HTML5 input multiple attribute:
file=file0&file=file1
I initially assumed it would be an array of sort but it seems to use an ampersand for separation.
My attempt to modify the code and add a for statement to iterate through each file specified in the form field using the following code has been unsuccessful (see error below). I am up for other ideas that may also work using Python if using a for statement is not the best route.
#!/usr/bin/python
import cgi, os
form = cgi.FieldStorage()
# Generator to buffer file chunks
def fbuffer(f, chunk_size=10000):
while True:
chunk = f.read(chunk_size)
if not chunk: break
yield chunk
for fileitem in form['file']:
# 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)
f = open('/var/www/domain.com/files' + fn, 'wb', 10000)
# Read the file in chunks
for chunk in fbuffer(fileitem.file):
f.write(chunk)
f.close()
message = 'The file "' + fn + '" was uploaded successfully'
else:
message = 'No file was uploaded'
print """\
Content-Type: text/html\n
<html><body>
<p>%s</p>
</body></html>
""" % (message,)
Single file selected error:
Traceback (most recent call last):, referer: https://www.domain.com/files/upload.htm
File "/usr/lib/cgi-bin/test.py", line 13, in <module>, referer: https://www.domain.com/files/upload.htm
for fileitem in form['file']:, referer: https://www.domain.com/files/upload.htm
File "/usr/lib/python2.6/cgi.py", line 518, in __iter__, referer: https://www.domain.com/files/upload.htm
return iter(self.keys()), referer: https://www.domain.com/files/upload.htm
File "/usr/lib/python2.6/cgi.py", line 583, in keys, referer: https://www.domain.com/files/upload.htm
raise TypeError, "not indexable", referer: https://www.domain.com/files/upload.htm
TypeError: not indexable, referer: https://www.domain.com/files/upload.htm
Premature end of script headers: test.py, referer: https://www.domain.com/files/upload.htm
Two files selected error:
Traceback (most recent call last):, referer: https://www.domain.com/files/upload.htm
File "/usr/lib/cgi-bin/test.py", line 19, in <module>, referer: https://www.domain.com/files/upload.htm
if fileitem.filename:, referer: https://www.domain.com/files/upload.htm
AttributeError: 'list' object has no attribute 'filename', referer: https://www.domain.com/files/upload.htm
Premature end of script headers: test.py, referer: https://www.domain.com/files/upload.htm
If the .filename references are removed, a third error is produced, same for single or two files being selected:
Traceback (most recent call last):, referer: https://www.domain.com/files/upload.htm
File "/usr/lib/cgi-bin/test.py", line 24, in <module>, referer: https://www.domain.com/files/upload.htm
fn = os.path.basename(fileitem), referer: https://www.domain.com/files/upload.htm
File "/usr/lib/python2.6/posixpath.py", line 111, in basename, referer: https://www.domain.com/files/upload.htm
i = p.rfind('/') + 1, referer: https://www.domain.com/files/upload.htm
AttributeError: 'list' object has no attribute 'rfind', referer: https://www.domain.com/files/upload.htm
Premature end of script headers: test.py, referer: https://www.domain.com/files/upload.htm
653
Remove for file in form. The error implies that form['file'] is a list.
Add to html form: method=post enctype=multipart/form-data.
import shutil
if 'file' in form:
filefield = form['file']
if not isinstance(filefield, list):
filefield = [filefield]
for fileitem in filefield:
if fileitem.filename:
fn = secure_filename(fileitem.filename)
# save file
with open('/var/www/domain.com/files/' + fn, 'wb') as f:
shutil.copyfileobj(fileitem.file, f)
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