forked from minibear2021/wechatpayv3
-
Notifications
You must be signed in to change notification settings - Fork 0
/
core.py
223 lines (208 loc) · 9.77 KB
/
core.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
# -*- coding: utf-8 -*-
import json
import os
from datetime import datetime
import requests
from .type import RequestType, SignType
from .utils import (aes_decrypt, build_authorization, hmac_sign,
load_certificate, load_private_key, rsa_decrypt,
rsa_encrypt, rsa_sign, rsa_verify)
class Core():
def __init__(self, mchid, cert_serial_no, private_key, apiv3_key, cert_dir=None, logger=None, proxy=None):
self._proxy = proxy
self._mchid = mchid
self._cert_serial_no = cert_serial_no
self._private_key = load_private_key(private_key)
self._apiv3_key = apiv3_key
self._gate_way = 'https://api.mch.weixin.qq.com'
self._certificates = []
self._cert_dir = cert_dir + '/' if cert_dir else None
self._logger = logger
self._init_certificates()
def _update_certificates(self):
path = '/v3/certificates'
self._certificates.clear()
code, message = self.request(path, skip_verify=True)
if code != 200:
return
data = json.loads(message).get('data')
for value in data:
serial_no = value.get('serial_no')
effective_time = value.get('effective_time')
expire_time = value.get('expire_time')
encrypt_certificate = value.get('encrypt_certificate')
algorithm = nonce = associated_data = ciphertext = None
if encrypt_certificate:
algorithm = encrypt_certificate.get('algorithm')
nonce = encrypt_certificate.get('nonce')
associated_data = encrypt_certificate.get('associated_data')
ciphertext = encrypt_certificate.get('ciphertext')
if not (serial_no and effective_time and expire_time and algorithm and nonce and associated_data and ciphertext):
continue
cert_str = aes_decrypt(
nonce=nonce,
ciphertext=ciphertext,
associated_data=associated_data,
apiv3_key=self._apiv3_key)
certificate = load_certificate(cert_str)
if not certificate:
continue
now = datetime.utcnow()
if now < certificate.not_valid_before or now > certificate.not_valid_after:
continue
self._certificates.append(certificate)
if not self._cert_dir:
continue
if not os.path.exists(self._cert_dir):
os.makedirs(self._cert_dir)
if not os.path.exists(self._cert_dir + serial_no + '.pem'):
with open(self._cert_dir + serial_no + '.pem', 'w') as f:
f.write(cert_str)
def _verify_signature(self, headers, body):
signature = headers.get('Wechatpay-Signature')
timestamp = headers.get('Wechatpay-Timestamp')
nonce = headers.get('Wechatpay-Nonce')
serial_no = headers.get('Wechatpay-Serial')
cert_found = False
for cert in self._certificates:
if int('0x' + serial_no, 16) == cert.serial_number:
cert_found = True
certificate = cert
break
if not cert_found:
self._update_certificates()
for cert in self._certificates:
if int('0x' + serial_no, 16) == cert.serial_number:
cert_found = True
certificate = cert
break
if not cert_found:
return False
if not rsa_verify(timestamp, nonce, body, signature, certificate):
return False
return True
def request(self, path, method=RequestType.GET, data=None, skip_verify=False, sign_data=None, files=None, cipher_data=False, headers={}):
if files:
headers.update({'Content-Type': 'multipart/form-data'})
else:
headers.update({'Content-Type': 'application/json'})
headers.update({'Accept': 'application/json'})
headers.update({'User-Agent': 'wechatpay v3 api python sdk(https://github.com/minibear2021/wechatpayv3)'})
if cipher_data:
headers.update({'Wechatpay-Serial': hex(self._last_certificate().serial_number)[2:].upper()})
authorization = build_authorization(
path,
method.value,
self._mchid,
self._cert_serial_no,
self._private_key,
data=sign_data if sign_data else data)
headers.update({'Authorization': authorization})
if self._logger:
self._logger.debug('Request url: %s' % self._gate_way + path)
self._logger.debug('Request type: %s' % method.value)
self._logger.debug('Request headers: %s' % headers)
self._logger.debug('Request params: %s' % data)
if method == RequestType.GET:
response = requests.get(url=self._gate_way + path, headers=headers, proxies=self._proxy)
elif method == RequestType.POST:
response = requests.post(url=self._gate_way + path, json=None if files else data, data=data if files else None, headers=headers, files=files, proxies=self._proxy)
elif method == RequestType.PATCH:
response = requests.patch(url=self._gate_way + path, json=data, headers=headers, proxies=self._proxy)
elif method == RequestType.PUT:
response = requests.put(url=self._gate_way + path, json=data, headers=headers, proxies=self._proxy)
elif method == RequestType.DELETE:
response = requests.delete(url=self._gate_way + path, headers=headers, proxies=self._proxy)
else:
raise Exception('wechatpayv3 does no support this request type.')
if self._logger:
self._logger.debug('Response status code: %s' % response.status_code)
self._logger.debug('Response headers: %s' % response.headers)
self._logger.debug('Response content: %s' % response.text)
if response.status_code in range(200, 300) and not skip_verify:
if not self._verify_signature(response.headers, response.text):
raise Exception('failed to verify the signature')
return response.status_code, response.text if 'application/json' in response.headers.get('Content-Type') else response.content
def sign(self, data, sign_type=SignType.RSA_SHA256):
if sign_type == SignType.RSA_SHA256:
sign_str = '\n'.join(data) + '\n'
return rsa_sign(self._private_key, sign_str)
elif sign_type == SignType.HMAC_SHA256:
key_list = sorted(data.keys())
sign_str = ''
for k in key_list:
v = data[k]
sign_str += str(k) + '=' + str(v) + '&'
sign_str += 'key=' + self._apiv3_key
return hmac_sign(self._apiv3_key, sign_str)
else:
raise ValueError('unexpected value of sign_type.')
def decrypt_callback(self, headers, body):
if isinstance(body, bytes):
body = body.decode('UTF-8')
if self._logger:
self._logger.debug('Callback Header: %s' % headers)
self._logger.debug('Callback Body: %s' % body)
if not self._verify_signature(headers, body):
return None
data = json.loads(body)
resource_type = data.get('resource_type')
if resource_type != 'encrypt-resource':
return None
resource = data.get('resource')
if not resource:
return None
algorithm = resource.get('algorithm')
if algorithm != 'AEAD_AES_256_GCM':
raise Exception('wechatpayv3 does not support this algorithm')
nonce = resource.get('nonce')
ciphertext = resource.get('ciphertext')
associated_data = resource.get('associated_data')
if not (nonce and ciphertext):
return None
if not associated_data:
associated_data = ''
result = aes_decrypt(
nonce=nonce,
ciphertext=ciphertext,
associated_data=associated_data,
apiv3_key=self._apiv3_key)
if self._logger:
self._logger.debug('Callback resource: %s' % result)
return result
def callback(self, headers, body):
if isinstance(body, bytes):
body = body.decode('UTF-8')
result = self.decrypt_callback(headers=headers, body=body)
if result:
data = json.loads(body)
data.update({'resource': json.loads(result)})
return data
else:
return result
def _init_certificates(self):
if self._cert_dir and os.path.exists(self._cert_dir):
for file_name in os.listdir(self._cert_dir):
if not file_name.lower().endswith('.pem'):
continue
with open(self._cert_dir + file_name, encoding="utf-8") as f:
certificate = load_certificate(f.read())
now = datetime.utcnow()
if certificate and now >= certificate.not_valid_before and now <= certificate.not_valid_after:
self._certificates.append(certificate)
if not self._certificates:
self._update_certificates()
if not self._certificates:
raise Exception('No wechatpay platform certificate, please double check your init params.')
def decrypt(self, ciphtext):
return rsa_decrypt(ciphertext=ciphtext, private_key=self._private_key)
def encrypt(self, text):
return rsa_encrypt(text=text, certificate=self._last_certificate())
def _last_certificate(self):
if not self._certificates:
self._update_certificates()
certificate = self._certificates[0]
for cert in self._certificates:
if certificate.not_valid_after < cert.not_valid_after:
certificate = cert
return certificate