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/usr/bin/sb_upload is in spambayes 1.1b1-1.1.

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The actual contents of the file can be viewed below.

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#! /usr/bin/python

"""
Read a message or a mailbox file on standard input, upload it to a
web server and write it to standard output.

By default, this sends the message to the SpamBayes sb_server web
interface, which will save the message in the 'unknown' cache, ready
for you to classify it.  It does not do any training, just saves it
ready for you to classify (unless you use the -t switch).

usage:  %(progname)s [-h] [-n] [-s server] [-p port] [-r N]
                     [-o section:option:value]
                     [-t (ham|spam)]

Options:
    -h, --help    - print help and exit
    -n, --null    - suppress writing to standard output (default %(null)s)
    -s, --server= - provide alternate web server (default %(server)s)
    -p, --port=   - provide alternate server port (default %(port)s)
    -r, --prob=   - feed the message to the trainer w/ prob N [0.0...1.0]
    -t, --train=  - train the message (pass either 'ham' or 'spam')
    -o, --option= - set [section, option] in the options database to value
"""

import sys
import httplib
import mimetypes
import getopt
import random
from spambayes.Options import options

progname = sys.argv[0]

__author__ = "Skip Montanaro <skip@pobox.com>"
__credits__ = "Spambayes gang, Wade Leftwich"

# appropriated verbatim from a recipe by Wade Leftwich in the Python
# Cookbook: 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.HTTP(host)
    h.putrequest('POST', selector)
    h.putheader('content-type', content_type)
    h.putheader('content-length', str(len(body)))
    h.endheaders()
    h.send(body)
    h.getreply()
    return h.file.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 = []
    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('')
    body = CRLF.join(L)
    content_type = 'multipart/form-data; boundary=%s' % BOUNDARY
    return content_type, body

def get_content_type(filename):
    return mimetypes.guess_type(filename)[0] or 'application/octet-stream'

def usage(*args):
    defaults = {}
    for d in args:
        defaults.update(d)
    print __doc__ % defaults

def main(argv):
    null = False
    server = "localhost"
    port = options["html_ui", "port"]
    prob = 1.0
    train_as = None

    try:
        opts, args = getopt.getopt(argv, "hns:p:r:t:o:",
                                   ["help", "null", "server=", "port=",
                                    "prob=", "train=", "option="])
    except getopt.error:
        usage(globals(), locals())
        sys.exit(1)

    for opt, arg in opts:
        if opt in ("-h", "--help"):
            usage(globals(), locals())
            sys.exit(0)
        elif opt in ("-n", "--null"):
            null = True
        elif opt in ("-s", "--server"):
            server = arg
        elif opt in ("-p", "--port"):
            port = int(arg)
        elif opt in ("-r", "--prob"):
            n = float(arg)
            if n < 0.0 or n > 1.0:
                usage(globals(), locals())
                sys.exit(1)
            prob = n
        elif opt in ("-t", "--train"):
            arg = arg.capitalize()
            if arg not in ("Ham", "Spam"):
                usage(globals(), locals())
                sys.exit(1)
            train_as = arg
        elif opt in ('-o', '--option'):
            options.set_from_cmdline(arg, sys.stderr)

    if args:
        usage(globals(), locals())
        sys.exit(1)

    data = sys.stdin.read()
    if not null:
        sys.stdout.write(data)
    if random.random() < prob:
        try:
            if train_as is not None:
                which_text = "Train as %s" % (train_as,)
                post_multipart("%s:%d" % (server, port), "/train",
                               [("which", which_text),
                                ("text", "")],
                               [("file", "message.dat", data)])
            else:
                post_multipart("%s:%d" % (server, port), "/upload", [],
                               [('file', 'message.dat', data)])
        except:
            # not an error if the server isn't responding
            pass

if __name__ == "__main__":
    main(sys.argv[1:])