import hashlib import hmac import json import random import requests from .geetest_lib_result import GeetestLibResult # sdk lib包，核心逻辑。 class GeetestLib: IS_DEBUG = False # 调试开关，是否输出调试日志 API_URL = "http://api.geetest.com" REGISTER_URL = "/register.php" VALIDATE_URL = "/validate.php" JSON_FORMAT = "1" NEW_CAPTCHA = True HTTP_TIMEOUT_DEFAULT = 5 # 单位：秒 VERSION = "python-flask:3.1.1" GEETEST_CHALLENGE = "geetest_challenge" # 极验二次验证表单传参字段 chllenge GEETEST_VALIDATE = "geetest_validate" # 极验二次验证表单传参字段 validate GEETEST_SECCODE = "geetest_seccode" # 极验二次验证表单传参字段 seccode def __init__(self, geetest_id, geetest_key): self.geetest_id = geetest_id self.geetest_key = geetest_key self.libResult = GeetestLibResult() def gtlog(self, message): if self.IS_DEBUG: print("gtlog: " + message) # 验证初始化 def register(self, digestmod, param_dict): self.gtlog("register(): 开始验证初始化, digestmod={0}.".format(digestmod)) origin_challenge = self.request_register(param_dict) self.build_register_result(origin_challenge, digestmod) self.gtlog("register(): 验证初始化, lib包返回信息={0}.".format(self.libResult)) return self.libResult def request_register(self, param_dict): param_dict.update({"gt": self.geetest_id, "sdk": self.VERSION, "json_format": self.JSON_FORMAT}) register_url = self.API_URL + self.REGISTER_URL self.gtlog("requestRegister(): 验证初始化, 向极验发送请求, url={0}, params={1}.".format(register_url, param_dict)) try: res = requests.get(register_url, params=param_dict, timeout=self.HTTP_TIMEOUT_DEFAULT) res_body = res.text if res.status_code == requests.codes.ok else "" self.gtlog("requestRegister(): 验证初始化, 与极验网络交互正常, 返回码={0}, 返回body={1}.".format(res.status_code, res_body)) res_dict = json.loads(res_body) origin_challenge = res_dict["challenge"] except Exception as e: self.gtlog("requestRegister(): 验证初始化, 请求异常，后续流程走宕机模式, " + repr(e)) origin_challenge = "" return origin_challenge def local_init(self): self.build_register_result("", "") self.gtlog("local_init(): bypass当前状态为fail，后续流程将进入宕机模式, " + self.libResult.data) return self.libResult # 构建验证初始化返回数据 def build_register_result(self, origin_challenge, digestmod): # origin_challenge为空或者值为0代表失败 if not origin_challenge or origin_challenge == "0": # 本地随机生成32位字符串 challenge = "".join(random.sample('abcdefghijklmnopqrstuvwxyz0123456789', 32)) data = json.dumps( {"success": 0, "gt": self.geetest_id, "challenge": challenge, "new_captcha": self.NEW_CAPTCHA}) self.libResult.set_all(0, data, "bypass当前状态为fail，后续流程走宕机模式") else: if digestmod == "md5": challenge = self.md5_encode(origin_challenge + self.geetest_key) elif digestmod == "sha256": challenge = self.sha256_endode(origin_challenge + self.geetest_key) elif digestmod == "hmac-sha256": challenge = self.hmac_sha256_endode(origin_challenge, self.geetest_key) else: challenge = self.md5_encode(origin_challenge + self.geetest_key) data = json.dumps( {"success": 1, "gt": self.geetest_id, "challenge": challenge, "new_captcha": self.NEW_CAPTCHA}) self.libResult.set_all(1, data, "") # 正常流程下（即验证初始化成功），二次验证 def success_validate(self, challenge, validate, seccode, param_dict=None): if param_dict is None: param_dict = {} self.gtlog( "success_validate(): 开始二次验证 正常模式, challenge={0}, validate={1}, seccode={2}.".format(challenge, validate, seccode)) if not self.check_param(challenge, validate, seccode): self.libResult.set_all(0, "", "正常模式，本地校验，参数challenge、validate、seccode不可为空") else: response_seccode = self.request_validate(challenge, validate, seccode, param_dict) if not response_seccode: self.libResult.set_all(0, "", "请求极验validate接口失败") elif response_seccode == "false": self.libResult.set_all(0, "", "极验二次验证不通过") else: self.libResult.set_all(1, "", "") self.gtlog("successValidate(): 二次验证 正常模式, lib包返回信息={0}.".format(self.libResult)) return self.libResult # 异常流程下（即验证初始化失败，宕机模式），二次验证 # 注意：由于是宕机模式，初衷是保证验证业务不会中断正常业务，所以此处只作简单的参数校验，可自行设计逻辑。 def fail_validate(self, challenge, validate, seccode): self.gtlog( "fail_validate(): 开始二次验证 宕机模式, challenge={0}, validate={1}, seccode={2}.".format(challenge, validate, seccode)) if not self.check_param(challenge, validate, seccode): self.libResult.set_all(0, "", "宕机模式，本地校验，参数challenge、validate、seccode不可为空.") else: self.libResult.set_all(1, "", "") self.gtlog("fail_validate(): 二次验证 宕机模式, lib包返回信息={0}.".format(self.libResult)) return self.libResult # 向极验发送二次验证的请求，POST方式 def request_validate(self, challenge, validate, seccode, param_dict): param_dict.update( {"seccode": seccode, "json_format": self.JSON_FORMAT, "challenge": challenge, "sdk": self.VERSION, "captchaid": self.geetest_id}) validate_url = self.API_URL + self.VALIDATE_URL self.gtlog("requestValidate(): 二次验证 正常模式, 向极验发送请求, url={0}, params={1}.".format(validate_url, param_dict)) try: res = requests.post(validate_url, data=param_dict, timeout=self.HTTP_TIMEOUT_DEFAULT) res_body = res.text if res.status_code == requests.codes.ok else "" self.gtlog( "requestValidate(): 二次验证 正常模式, 与极验网络交互正常, 返回码={0}, 返回body={1}.".format(res.status_code, res_body)) res_dict = json.loads(res_body) seccode = res_dict["seccode"] except Exception as e: self.gtlog("requestValidate(): 二次验证 正常模式, 请求异常, " + repr(e)) seccode = "" return seccode # 校验二次验证的三个参数，校验通过返回true，校验失败返回false def check_param(self, challenge, validate, seccode): return not ( challenge is None or challenge.isspace() or validate is None or validate.isspace() or seccode is None or seccode.isspace()) def md5_encode(self, value): md5 = hashlib.md5() md5.update(value.encode("utf-8")) return md5.hexdigest() def sha256_endode(self, value): sha256 = hashlib.sha256() sha256.update(value.encode("utf-8")) return sha256.hexdigest() def hmac_sha256_endode(self, value, key): return hmac.new(key.encode("utf-8"), value.encode("utf-8"), digestmod=hashlib.sha256).hexdigest()