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import base64 |
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import random |
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3
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import string |
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4
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from urllib.parse import urlparse, urlunparse |
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5
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6
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from bs4 import BeautifulSoup |
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from requests import Response |
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from requests.adapters import HTTPAdapter |
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from urllib3.util import create_urllib3_context |
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from ..models import Signer, Certificate |
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# Ciphers compatible with SAT Services |
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CIPHERS = ( |
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'ECDHE+AESGCM:ECDHE+CHACHA20:DHE+AESGCM:DHE+CHACHA20:ECDH+AESGCM:' |
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'DH+AESGCM:ECDH+AES:DH+AES:RSA+AESGCM:RSA+AES:!aNULL:!eNULL:!MD5:!DSS' |
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':HIGH:!DH' |
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) |
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class SSLAdapter(HTTPAdapter): |
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def init_poolmanager(self, *args, **kwargs): |
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kwargs['ssl_context'] = create_urllib3_context(ciphers=CIPHERS) |
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return super().init_poolmanager(*args, **kwargs) |
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def proxy_manager_for(self, *args, **kwargs): |
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kwargs['ssl_context'] = create_urllib3_context(ciphers=CIPHERS) |
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return super().proxy_manager_for(*args, **kwargs) |
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def generate_token(signer: Signer, code: str) -> bytes: |
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rfc = signer.rfc |
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num_serie = signer.certificate_number |
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co = code + "|" + rfc + "|" + num_serie |
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39
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signature = signer.sign_sha1(data=co.encode()) |
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40
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41
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return base64.b64encode( |
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base64.b64encode(co.encode()) + b"#" + base64.b64encode(signature.encode()) |
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) |
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def verify_token(certificate: Certificate, token: bytes) -> str: |
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decoded_token = base64.b64decode(token) |
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code, signature = decoded_token.split(b"#", maxsplit=2) |
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code = base64.b64decode(code) |
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signature = base64.b64decode(signature) |
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53
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assert certificate.verify_sha1( |
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data=code, |
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signature=base64.b64decode(signature) |
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) |
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58
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code, rfc, num_serie = code.decode().split("|", maxsplit=3) |
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60
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assert rfc == certificate.rfc |
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assert num_serie == certificate.certificate_number |
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63
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return code |
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64
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def action_url(action: str | None, url: str): |
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if not action: |
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return url |
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if action.startswith('/'): |
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parts = urlparse(url) |
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return urlunparse((parts.scheme, parts.netloc, action, None, None, None)) |
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return action |
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76
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77
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def get_form(res: Response, id=None): |
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html = BeautifulSoup(res.text, 'html.parser') |
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if id: |
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form = html.find(id=id) |
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else: |
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82
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form = html.select('form')[0] |
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84
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data = { |
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i.attrs['name']: i.attrs.get('value') |
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86
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for i in form.findChildren('input') |
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if 'name' in i.attrs |
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} |
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89
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90
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assert form.attrs['method'].upper() == "POST" |
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91
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return action_url(form.attrs.get('action'), res.url), data |
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92
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93
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94
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def request_ref_headers(url): |
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95
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parts = urlparse(url) |
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96
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return { |
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97
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'origin': urlunparse((parts.scheme, parts.netloc, '', '', '', '')), |
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98
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'referer': url |
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99
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} |
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100
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101
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102
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1 |
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def request_verification_token(res: Response): |
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103
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html = BeautifulSoup(res.text, 'html.parser') |
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104
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return html.find(name='input', attrs={'name': '__RequestVerificationToken'}).attrs['value'] |
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105
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106
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107
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1 |
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def random_ajax_id(): |
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108
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return ''.join(random.choice(string.ascii_letters + string.digits) for _ in range(5)) |
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SAT-CFDI /
python-satcfdi
