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flyapps/fir_ser/api/utils/mp/utils.py

222 lines
7.7 KiB

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# project: 9月
# author: NinEveN
# date: 2021/9/6
import base64
import hashlib
import logging
import random
import socket
import string
import struct
import time
import xml.etree.cElementTree as ET
from Crypto.Cipher import AES
from . import ierror
logger = logging.getLogger(__name__)
class XMLParse:
"""提供提取消息格式中的密文及生成回复消息格式的接口"""
# xml消息模板
AES_TEXT_RESPONSE_TEMPLATE = """<xml>
<Encrypt><![CDATA[%(msg_encrypt)s]]></Encrypt>
<MsgSignature><![CDATA[%(msg_signature)s]]></MsgSignature>
<TimeStamp>%(timestamp)s</TimeStamp>
<Nonce><![CDATA[%(nonce)s]]></Nonce>
</xml>"""
def extract(self, xml_text):
"""提取出xml数据包中的加密消息
@param xml_text: 待提取的xml字符串
@return: 提取出的加密消息字符串
"""
try:
xml_tree = ET.fromstring(xml_text)
encrypt = xml_tree.find("Encrypt")
to_user_name = xml_tree.find("ToUserName")
return ierror.WXBizMsgCrypt_OK, encrypt.text, to_user_name.text
except Exception as e:
logger.error(e)
return ierror.WXBizMsgCrypt_ParseXml_Error, None, None
def generate(self, encrypt, signature, timestamp, nonce):
"""生成xml消息
@param encrypt: 加密后的消息密文
@param signature: 安全签名
@param timestamp: 时间戳
@param nonce: 随机字符串
@return: 生成的xml字符串
"""
resp_dict = {
'msg_encrypt': encrypt,
'msg_signature': signature,
'timestamp': timestamp,
'nonce': nonce,
}
resp_xml = self.AES_TEXT_RESPONSE_TEMPLATE % resp_dict
return resp_xml
class PKCS7Encoder(object):
"""提供基于PKCS7算法的加解密接口"""
block_size = 32
def encode(self, text):
""" 对需要加密的明文进行填充补位
@param text: 需要进行填充补位操作的明文
@return: 补齐明文字符串
"""
text_length = len(text)
# 计算需要填充的位数
amount_to_pad = self.block_size - (text_length % self.block_size)
if amount_to_pad == 0:
amount_to_pad = self.block_size
# 获得补位所用的字符
pad = chr(amount_to_pad)
return text + pad * amount_to_pad
def decode(self, decrypted):
"""删除解密后明文的补位字符
@param decrypted: 解密后的明文
@return: 删除补位字符后的明文
"""
pad = ord(decrypted[-1])
if pad < 1 or pad > 32:
pad = 0
return decrypted[:-pad]
def get_random_str():
""" 随机生成16位字符串
@return: 16位字符串
"""
rule = string.ascii_letters + string.digits
return "".join(random.sample(rule, 16))
class Prpcrypt(object):
"""提供接收和推送给公众平台消息的加解密接口"""
def __init__(self, key):
# self.key = base64.b64decode(key+"=")
self.key = key
# 设置加解密模式为AES的CBC模式
self.mode = AES.MODE_CBC
def encrypt(self, text, app_id):
"""对明文进行加密
:param text: 需要加密的明文
:param app_id: 应用id
@return: 加密得到的字符串
"""
# 16位随机字符串添加到明文开头
text = get_random_str() + struct.pack("I", socket.htonl(len(text))).decode('utf-8') + text + app_id
# 使用自定义的填充方式对明文进行补位填充
pkcs7 = PKCS7Encoder()
text = pkcs7.encode(text)
# 加密
crypto = AES.new(self.key, self.mode, self.key[:16])
try:
ciphertext = crypto.encrypt(text)
# 使用BASE64对加密后的字符串进行编码
return ierror.WXBizMsgCrypt_OK, base64.b64encode(ciphertext)
except Exception as e:
logger.error(e)
return ierror.WXBizMsgCrypt_EncryptAES_Error, None
def decrypt(self, text, app_id):
""" 对解密后的明文进行补位删除
:param text: 密文
:param app_id: 应用id
:return: 删除填充补位后的明文
"""
try:
cryptor = AES.new(self.key, self.mode, self.key[:16])
# 使用BASE64对密文进行解码,然后AES-CBC解密
plain_text = cryptor.decrypt(base64.b64decode(text))
except Exception as e:
logger.error(e)
return ierror.WXBizMsgCrypt_DecryptAES_Error, None
try:
pad = plain_text[-1]
# 去掉补位字符串
# pkcs7 = PKCS7Encoder()
# plain_text = pkcs7.encode(plain_text)
# 去除16位随机字符串
content = plain_text[16:-pad]
xml_len = socket.ntohl(struct.unpack("I", content[: 4])[0])
xml_content = content[4: xml_len + 4]
from_app_id = content[xml_len + 4:].decode('utf-8')
except Exception as e:
logger.error(e)
return ierror.WXBizMsgCrypt_IllegalBuffer, None
if from_app_id != app_id:
return ierror.WXBizMsgCrypt_ValidateAppid_Error, None
return 0, xml_content
class WxMsgCryptBase(object):
def __init__(self, app_id, app_secret, token, encoding_aes_key):
try:
self.key = base64.b64decode(encoding_aes_key + "=")
assert len(self.key) == 32
except Exception as e:
logger.error(f"{encoding_aes_key} 解密失败 Exception:{e}")
raise Exception("[error]: EncodingAESKey invalid !")
self.token = token
self.app_id = app_id
def encrypt_msg(self, msg, nonce, timestamp=None):
"""
:param msg: 企业号待回复用户的消息,xml格式的字符串
:param nonce: 随机串,可以自己生成,也可以用URL参数的nonce
:param timestamp: 时间戳,可以自己生成,也可以用URL参数的timestamp,如为None则自动用当前时间
:return: 成功0,sEncryptMsg,失败返回对应的错误码None
"""
pc = Prpcrypt(self.key)
ret, encrypt = pc.encrypt(msg, self.app_id)
if ret != 0:
return ret, None
if timestamp is None:
timestamp = str(int(time.time()))
try:
sha = hashlib.sha1(("".join(sorted([self.token, timestamp, nonce, encrypt]))).encode('utf-8'))
return ret, XMLParse().generate(encrypt, sha.hexdigest(), timestamp, nonce)
except Exception as e:
logger.error(e)
return ierror.WXBizMsgCrypt_ComputeSignature_Error, None
def decrypt_msg(self, msg, msg_signature, timestamp, nonce):
"""
:param msg: 密文,对应POST请求的数据
:param msg_signature: 签名串,对应URL参数的msg_signature
:param timestamp: 时间戳,对应URL参数的timestamp
:param nonce: 随机串,对应URL参数的nonce
:return: 成功0,失败返回对应的错误码
"""
if isinstance(msg, str):
ret, encrypt, _ = XMLParse().extract(msg)
if ret != 0:
return ret, None
else:
encrypt = msg.get('Encrypt')
try:
sha = hashlib.sha1(("".join(sorted([self.token, timestamp, nonce, encrypt]))).encode('utf-8'))
if not sha.hexdigest() == msg_signature:
return ierror.WXBizMsgCrypt_ValidateSignature_Error, None
pc = Prpcrypt(self.key)
ret, xml_content = pc.decrypt(encrypt, self.app_id)
return ret, xml_content
except Exception as e:
logger.error(e)
return ierror.WXBizMsgCrypt_ComputeSignature_Error, None