import httplib #, mimetypes
import sysinfo

# Modified from
# http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/146306
def post_multipart(host, selector, fields, files):
    """
    Post fields and files to an http host as multipart/form-data.
    fields is a sequence of (name, value) elements for regular form fields.
    files is a sequence of (name, filename, value) elements for data to be uploaded as files
    Return the server's response page.
    """
    content_type, body = encode_multipart_formdata(fields, files)
    h = httplib.HTTPConnection(host)  
    headers = {
        'User-Agent': sysinfo.sw_version(),
        'Content-Type': content_type
        }
    h.request('POST', selector, body, headers)
    res = h.getresponse()
    return res.status, res.reason, res.read()

def encode_multipart_formdata(fields, files):
    """
    fields is a sequence of (name, value) elements for regular form fields.
    files is a sequence of (name, filename, value) elements for data to be uploaded as files
    Return (content_type, body) ready for httplib.HTTP instance
    """
    BOUNDARY = '----------ThIs_Is_tHe_bouNdaRY_$'
    CRLF = '\r\n'
    L = []
    # No need to URL encode as this is form text data.
    for (key, value) in fields:
        L.append('--' + BOUNDARY)
        L.append('Content-Disposition: form-data; name="%s"' % key)
        L.append('')
        L.append(value)
    for (key, filename, value) in files:
        L.append('--' + BOUNDARY)
        L.append('Content-Disposition: form-data; name="%s"; filename="%s"' % (key, filename))
        L.append('Content-Type: %s' % get_content_type(filename))
        L.append('')
        L.append(value)
    L.append('--' + BOUNDARY + '--')
    L.append('')
    # ''.join() won't work here (PyS60 doesn't like it), so we do it
    # with a virtual file.
    from cStringIO import StringIO
    file_str = StringIO()
    for i in range(len(L)):
        file_str.write(L[i])
        file_str.write(CRLF)
    body = file_str.getvalue()
    content_type = 'multipart/form-data; boundary=%s' % BOUNDARY
    return content_type, body

def get_content_type(filename):
    # we should guess the type, but since its not in our PyS60
    # distribution, we will just say octet.
    # return mimetypes.guess_type(filename)[0] or 'application/octet-stream'
    return 'application/octet-stream'