tjsp download captcha - https://drive.google.com/file/d/0B5M9euvZPDWkejJlckFzM2FSZ0U/view?usp=sharing

tjsp.py

"""Simples script para baixar imagens do captcha do portal TJSP.

Copyright (c) 2016, Murilo Ijanc
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

* Neither the name of crawlcps nor the names of its
  contributors may be used to endorse or promote products derived from
  this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""

import time
import socket
import logging
import argparse
import urllib.error
import urllib.request

# url do captcha "precisamos" adicionar timestamp
captcha_url = ("http://esaj.tjsp.jus.br/sco/"
               "imagemCaptcha.do?timestamp={timestamp}")

# nome final do arquivo
filename = "{file_name}.png"


def timestamp_now():
    """gera timestamp"""
    return int(time.time())


def download(num, interval, _timeout, max_retry=3):
    """funcao para download das imagens do captcha
    o timestamp gerado sera o nome utilizado para
    salvar as imagens.
    """
    logging.info("Baixando %d imagens." % num)
    count = 1
    retry = 1
    while count <= num and retry <= max_retry:
        logging.debug("Faltam [%d] imagens de um total: [%d]" % ((num - count),
                                                                 num))
        timestamp = timestamp_now()
        url = captcha_url.format(timestamp=timestamp)  # url final
        _file = filename.format(file_name=timestamp)
        try:
            with urllib.request.urlopen(url, timeout=_timeout) \
                    as response, open(_file, 'wb') as out_file:
                data = response.read()
                out_file.write(data)
                logging.debug("Salvando %s" % _file)
        except (urllib.error.HTTPError, urllib.error.URLError) as e:
            logging.error("Erro: %s, tentativa [%d] de [%d]" % (e, retry,
                                                                max_retry))
            retry += 1
        except socket.timeout:
            logging.warning("Timeout, faltam [%d] tentativas de um total: [%d]"
                            % ((max_retry - retry), max_retry))
            retry += 1
            count -= 1  # subtraimos para nova tentativa
        count += 1
        time.sleep(interval)


def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("-n", "--num", type=int, default=10,
                    help="numero de imagens para download, padrao = 10")
    ap.add_argument("-i", "--interval", type=float, default=5.0,
                    help="intervalo para baixar imagem")
    ap.add_argument("-t", "--timeout", type=float, default=10.0,
                    help="timeout, padrao = 10 s")
    ap.add_argument("-r", "--retry", type=int, default=3,
                    help="tentativas no caso do timeout, padrao = 0")
    ap.add_argument("-v", "--verbose", action="count", default=0,
                    help=("depuracao: 0 = avisos, "
                          "1 = info, 2 = debug. "
                          "padrao = avisos."))
    args = ap.parse_args()

    # nivel de debug
    levels = [logging.WARNING, logging.INFO, logging.DEBUG]
    level = levels[min(len(levels) - 1, args.verbose)]

    logging.basicConfig(level=level,
                        format="%(asctime)s %(levelname)s %(message)s")
    download(args.num, args.interval, args.timeout, args.retry)


if __name__ == '__main__':
    main()

tjsp.sh

$ python3 tjsp.py --help
usage: tjsp.py [-h] [-n NUM] [-i INTERVAL] [-t TIMEOUT] [-r RETRY] [-v]

optional arguments:
  -h, --help            show this help message and exit
  -n NUM, --num NUM     numero de imagens para download, padrao = 10
  -i INTERVAL, --interval INTERVAL
                        intervalo para baixar imagem
  -t TIMEOUT, --timeout TIMEOUT
                        timeout, padrao = 10 s
  -r RETRY, --retry RETRY
                        tentativas no caso do timeout, padrao = 0
  -v, --verbose         depuracao: 0 = avisos, 1 = info, 2 = debug. padrao =
                        avisos.
                   
$ python3 tjsp.py -vvv
2017-03-13 21:45:12,855 INFO Baixando 10 imagens.
2017-03-13 21:45:12,855 DEBUG Faltam [9] imagens de um total: [10]
2017-03-13 21:45:12,971 DEBUG Salvando 1489452312.png
2017-03-13 21:45:17,977 DEBUG Faltam [8] imagens de um total: [10]
2017-03-13 21:45:18,100 DEBUG Salvando 1489452317.png
2017-03-13 21:45:23,103 DEBUG Faltam [7] imagens de um total: [10]
2017-03-13 21:45:23,207 DEBUG Salvando 1489452323.png
2017-03-13 21:45:28,210 DEBUG Faltam [6] imagens de um total: [10]
2017-03-13 21:45:28,330 DEBUG Salvando 1489452328.png
2017-03-13 21:45:33,330 DEBUG Faltam [5] imagens de um total: [10]
2017-03-13 21:45:33,454 DEBUG Salvando 1489452333.png
2017-03-13 21:45:38,457 DEBUG Faltam [4] imagens de um total: [10]
2017-03-13 21:45:38,560 DEBUG Salvando 1489452338.png
2017-03-13 21:45:43,566 DEBUG Faltam [3] imagens de um total: [10]
2017-03-13 21:45:43,638 DEBUG Salvando 1489452343.png
2017-03-13 21:45:48,641 DEBUG Faltam [2] imagens de um total: [10]
2017-03-13 21:45:48,737 DEBUG Salvando 1489452348.png
2017-03-13 21:45:53,739 DEBUG Faltam [1] imagens de um total: [10]
2017-03-13 21:45:53,845 DEBUG Salvando 1489452353.png
2017-03-13 21:45:58,847 DEBUG Faltam [0] imagens de um total: [10]
2017-03-13 21:45:58,951 DEBUG Salvando 1489452358.png
"""