大师兄的Python学习笔记(二十五）: 爬虫（六）

大师兄的Python学习笔记(二十四）: 爬虫（五）
大师兄的Python学习笔记(二十六）: 爬虫（七）

七、识别验证码

1. 识别简单图形验证码

• 通常由4位字母或数字组成。

  
  
  
• 需要使用tesserocr库做图像文字识别。

1.1 在windows下安装tesserocr库

• tesserocr库在windows下需要tesseract的支持，所以需要先安装tesseract, 点击此处下载并安装。
• 将tesseract添加到环境变量。
  
  
  
  
  
• 点击下载tesserocr库
• 使用pip install ./tesserocr-2.4.0-cp37-cp37m-win_amd64.whl安装,具体位置根据你的文件位置调整。

1.2 识别方法

1) tesserocr.image_to_text(image)

• 识别图形中的文字。

2) tesserocr.file_to_text(image)

• 识别图片文件中的文字，效果不如image_to_text(image)。

>>>import tesserocr
>>>import os
>>>from PIL import Image

>>>path = os.path.join("d:\\","sample_code","Graphical_verification_code.jpg")
>>>image = Image.open(path)
>>>image = image.convert('L') # 转为灰度图像
>>>result = tesserocr.image_to_text(image)
>>>print(result)
D5Qe

2. 识别极验验证码

• 极验验证码是现在大部分网站的验证方式https://www.geetest.com/。
• 主要以点按、滑动、选字、选图、识字组词等方式验证。
• 可以尝试使用Selenium库模拟页面行为通过验证。
• 极验验证码是在不停升级的，所谓道高一尺魔高一丈...

2.1 识别环境

以极客官网后台登录https://auth.geetest.com/login为例，需要考虑三种情况：

• 模拟点击
• 滑动拼图到缺口
• 模拟托块滑动

2.2 模拟点击

• 模拟点击比较简单，直接用Selenium包模拟点击即可。

  
  
  

>>>from selenium import webdriver
>>>from selenium.webdriver.support.wait import WebDriverWait
>>>from selenium.webdriver.support import expected_conditions as EC
>>>from selenium.webdriver.common.by import By

>>>class Geetest_sample():
>>>    def __init__(self,user_name,password,url='https://auth.geetest.com/login'):
>>>        self.url = url
>>>        self.user_name = user_name
>>>        self.password = password
>>>        self.browser = webdriver.Firefox()
>>>        self.wait = WebDriverWait(self.browser,10)

>>>    def get_button(self):
>>>        # 定位按键验证码元素
>>>        button = >>>self.wait.until(EC.element_to_be_clickable((By.CLASS_NAME,'geetest_radar_tip_content')))
>>>        return button

>>>    def sort_username_password(self):
>>>        # 输入用户名密码
>>>        input_username = self.browser.find_element(By.CSS_SELECTOR,'.ivu-input')
>>>        input_password = self.browser.find_element(By.CSS_SELECTOR,'[placeholder~=请输入密码]')
>>>        input_username.send_keys(self.user_name)
>>>        input_password.send_keys(self.password)

>>>    def crack_geek(self):
>>>        # 执行点击
>>>        self.browser.get(self.url)
>>>        self.sort_username_password()
>>>        button = self.get_button()
>>>        button.click()

>>>if __name__ == '__main__':
>>>    gs = Geetest_sample('test','test')
>>>    gs.crack_geek()

2.3 滑动拼图到缺口

• 关键在于使用边缘检测算法找到缺口位置，之后将滑块移动到缺口位置。

• 滑块动作需要模拟人的动作，比如先加速再减速。

  
  
  

>>>from selenium import webdriver
>>>from selenium.webdriver import ActionChains
>>>from selenium.webdriver.support.wait import WebDriverWait
>>>from selenium.webdriver.support import expected_conditions as EC
>>>from selenium.webdriver.common.by import By
>>>from PIL import Image
>>>from io import BytesIO
>>>import time

>>>class Geetest_sample():
>>>    def __init__(self,user_name,password,url='https://auth.geetest.com/login'):
>>>        self.url = url
>>>        self.user_name = user_name
>>>        self.password = password
>>>        self.browser = webdriver.Firefox()
>>>        self.wait = WebDriverWait(self.browser,10)

>>>    def get_button(self):
>>>        button = self.wait.until(EC.element_to_be_clickable((By.CLASS_NAME,'geetest_radar_tip_content')))
>>>        return button

>>>    def sort_username_password(self):
>>>        input_username = self.browser.find_element(By.CSS_SELECTOR,'.ivu-input')
>>>        input_password = self.browser.find_element(By.CSS_SELECTOR,'[placeholder~=请输入密码]')
>>>        input_username.send_keys(self.user_name)
>>>        input_password.send_keys(self.password)

>>>    def get_screenshot(self):
        # 获得完整的图片
>>>        screenshot = self.browser.get_screenshot_as_png()
>>>        screenshot = Image.open(BytesIO(screenshot))
>>>        return screenshot

>>>    def get_img_position(self):
>>>        # 获取验证码图片
>>>        img = self.wait.until(EC.presence_of_all_elements_located((By.CLASS_NAME,'geetest_canvas_img'))) # 如果图片验证码出现
>>>        time.sleep(2) # 模拟人的反应
>>>        location = img[0].location
>>>        size = img[0].size
>>>        top,bottom,left,right = location.get('y'),location.get('y') + size.get('height'),location.get('x'),location.get('x') + size.get('width')
>>>        return top,bottom,left,right

>>>    def get_geetest_image(self):
>>>        # 获取验证码位置
>>>        top,bottom,left,right = self.get_img_position()
>>>        screenshot = self.get_screenshot()
>>>        captcha = screenshot.crop((left,top,right,bottom))
>>>        return captcha

>>>    def get_slider(self):
>>>        # 获取滑块
>>>        slider = self.wait.until(EC.element_to_be_clickable((By.CLASS_NAME,'geetest_slider_button')))
>>>        return slider

>>>    def is_pixel_equal(self,image1,image2,x,y):
>>>        # 判断图片是否相同
>>>        pixel1 = image1.load()[x,y]
>>>        pixel2 = image2.load()[x,y]
>>>        threshold = 60
>>>        if abs(pixel1[0] - pixel2[0]) < threshold and abs(pixel1[1]-pixel2[1]) < threshold and abs(pixel1[2]-pixel2[2]) < threshold:
>>>            return True
>>>        else:
>>>            return False

>>>    def get_gap(self,image1,image2):
>>>        # 获取缺口位置
>>>        left = 60
>>>        for i in range(left,image1.size[0]):
>>>            for j in range(image1.size[1]):
>>>                if not self.is_pixel_equal(image1,image2,i,j):
>>>                    left = i
>>>                    return left
>>>        return left

>>>    def get_track(self,distance):
>>>        # 计算运动轨迹
>>>        track = [] # 移动轨迹
>>>        current = 0 # 当前位移
>>>        mid = distance*4/5  # 减速阈值
>>>        t = 0.2  # 间隔时间
>>>        v = 0 # 初速度
>>>        while current < distance:
>>>            if current < mid:
>>>                a = 2 # 加速度
>>>            else:
>>>                a = -3
>>>            v0 = v #初速度
>>>            v =v0 + a*t # 当前速度
>>>            move = v0*t + (1/2)*a*t*t # 移动距离
>>>            current += move
>>>            track.append(round(move))
>>>        return track

>>>    def move_to_gap(self,slider,tracks):
>>>        # 移动滑块
>>>        ActionChains(self.browser).click_and_hold(slider).perform() # 按住滑块
>>>        for x in tracks:
>>>            ActionChains(self.browser).move_by_offset(xoffset=x,yoffset=0).perform()
>>>        time.sleep(0.5)
>>>        ActionChains(self.browser).release().perform()

>>>    def sort_random_geetest(self):
>>>        # 判断第二次验证
>>>        image1 = self.get_screenshot()
>>>        if image1:
>>>            image2 = self.get_geetest_image()
>>>            slider = self.get_slider()
>>>            slider.click()
>>>            gap = self.get_gap(image1=image1, image2=image2)
>>>            track = self.get_track(gap)
>>>            self.move_to_gap(slider, track)

>>>    def crack_geek(self):
>>>        # 第一步，先输入用户名和密码
>>>        self.browser.get(self.url)
>>>        self.sort_username_password()

>>>        # 第二步，完成点击验证
>>>        button = self.get_button()
>>>        button.click()

>>>        # 第三部，完成随机验证
>>>        self.sort_random_geetest()

>>>if __name__ == '__main__':
>>>    gs = Geetest_sample('test','test')
>>>    gs.crack_geek()

2.4 点触验证吗

• 这类验证码需要借助第三方API解决。
• 这里使用了超级鹰验证码识别平台作为解决方案。
• 需要注意调整验证码截图的尺寸。

>>>from selenium import webdriver
>>>from selenium.webdriver import ActionChains
>>>from selenium.webdriver.support.wait import WebDriverWait
>>>from selenium.webdriver.support import expected_conditions as EC
>>>from selenium.webdriver.common.by import By
>>>from PIL import Image
>>>from io import BytesIO
>>>from hashlib import md5
>>>from selenium.common.exceptions import *
>>>import time
>>>import requests

>>>CHAOJIYING_USERNAME = "yourusername"
>>>CHAOJIYING_PASSWORD = "yourpassword"
>>>CHAOJIYING_SOFT_ID = "yoursoftid"
>>>CHAOJIYING_TYPE = "9004" # 坐标选四,返回格式:x1,y1|x2,y2|x3,y3|x4,y4

>>>class Chaojiying(object):
>>>    ```
>>>    connect to chaojiying
>>>    ```
>>>    def __init__(self, username, password, soft_id):
>>>        self.username = username
>>>        password = password.encode('utf8')
>>>        self.password = md5(password).hexdigest()
>>>        self.soft_id = soft_id
>>>        self.base_params = {
>>>            'user': self.username,
>>>            'pass2': self.password,
>>>            'softid': self.soft_id,
>>>        }
>>>        self.headers = {
>>>            'Connection': 'Keep-Alive',
>>>            'User-Agent': 'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0)',
>>>        }

>>>    def PostPic(self, im, codetype):
>>>        """
>>>        im: 图片字节
>>>        codetype: 题目类型 参考 http://www.chaojiying.com/price.html
>>>        """
>>>        params = {
>>>            'codetype': codetype,
>>>        }
>>>        params.update(self.base_params)
>>>        files = {'userfile': ('ccc.jpg', im)}
>>>        r = requests.post('http://upload.chaojiying.net/Upload/Processing.php', data=params, files=files,
>>>                          headers=self.headers)
>>>        return r.json()

>>>    def ReportError(self, im_id):
>>>        """
>>>        im_id:报错题目的图片ID
>>>        """
>>>        params = {
>>>            'id': im_id,
>>>        }
>>>        params.update(self.base_params)
>>>        r = requests.post('http://upload.chaojiying.net/Upload/ReportError.php', data=params, headers=self.headers)
>>>        return r.json()

>>> class Geetest_sample():
>>>     def __init__(self,user_name,password,url='https://auth.geetest.com/login'):
>>>         self.url = url
>>>         self.user_name = user_name
>>>         self.password = password
>>>         self.browser = webdriver.Firefox()
>>>         self.wait = WebDriverWait(self.browser,10)
>>>         self.chaojiying = >>>Chaojiying(CHAOJIYING_USERNAME,CHAOJIYING_PASSWORD,CHAOJIYING_SOFT_ID)

>>>    def get_button(self,cls):
>>>        # 获取滑块
>>>        button = self.wait.until(EC.element_to_be_clickable((By.CLASS_NAME,cls)))
>>>        return button

>>>    def sort_username_password(self):
>>>        input_username = self.browser.find_element(By.CSS_SELECTOR,'.ivu-input')
>>>        input_password = self.browser.find_element(By.CSS_SELECTOR,'[placeholder~=请输入密码]')
>>>        input_username.send_keys(self.user_name)
>>>        input_password.send_keys(self.password)

>>>    def get_screenshot(self):
>>>        # 获得完整的图片
>>>        screenshot = self.browser.get_screenshot_as_png()
>>>        screenshot = Image.open(BytesIO(screenshot))
>>>        return screenshot

>>>    def get_img_position(self,cls):
>>>        # 获取验证码图片
>>>        img = self.wait.until(EC.presence_of_all_elements_located((By.CLASS_NAME,cls))) # 如果图片验证码出现
>>>        time.sleep(2) # 模拟人的反应
>>>        location = img[0].location
>>>        size = img[0].size
>>>        top,bottom,left,right = location.get('y'),location.get('y') + size.get('height'),location.get('x'),location.get('x') + size.get('width')
>>>        return top,bottom,left,right

>>>    def get_geetest_image(self,cls):
>>>        # 获取验证码位置
>>>        top,bottom,left,right = self.get_img_position(cls)
>>>        print(top,bottom,left,right)
>>>        screenshot = self.get_screenshot()
>>>        captcha = screenshot.crop((left,top,right,bottom))
>>>        return captcha

>>>    def is_pixel_equal(self,image1,image2,x,y):
>>>        # 判断图片是否相同
>>>        pixel1 = image1.load()[x,y]
>>>        pixel2 = image2.load()[x,y]
>>>        threshold = 60
>>>        if abs(pixel1[0] - pixel2[0]) < threshold and abs(pixel1[1]-pixel2[1]) < threshold and abs(pixel1[2]-pixel2[2]) < threshold:
>>>            return True
>>>        else:
>>>            return False

>>>    def get_gap(self,image1,image2):
>>>        # 获取缺口位置
>>>        left = 60
>>>        for i in range(left,image1.size[0]):
>>>            for j in range(image1.size[1]):
>>>                if not self.is_pixel_equal(image1,image2,i,j):
>>>                    left = i
>>>                    return left
>>>        return left

>>>    def get_track(self,distance):
>>>        # 计算运动轨迹
>>>        track = [] # 移动轨迹
>>>        current = 0 # 当前位移
>>>        mid = distance*4/5  # 减速阈值
>>>        t = 0.2  # 间隔时间
>>>        v = 0 # 初速度
>>>        while current < distance:
>>>            if current < mid:
>>>                a = 2 # 加速度
>>>            else:
>>>                a = -3
>>>            v0 = v #初速度
>>>            v =v0 + a*t # 当前速度
>>>            move = v0*t + (1/2)*a*t*t # 移动距离
>>>            current += move
>>>            track.append(round(move))
>>>        return track

>>>    def move_to_gap(self,slider,tracks):
>>>        # 移动滑块
>>>        ActionChains(self.browser).click_and_hold(slider).perform() # 按住滑块
>>>        for x in tracks:
>>>            ActionChains(self.browser).move_by_offset(xoffset=x,yoffset=0).perform()
>>>            time.sleep(0.5)
>>>        ActionChains(self.browser).release().perform()

>>>    def get_points(self,result):
>>>        # 解析结果
>>>        groups = result.get('pic_str').split('|')
>>>        print(groups)
>>>        locations = [[int(number) for number in group.split(',')] for group in groups]
>>>        return locations

>>>    def click_locations(self,locations):
>>>        # 点击验证图片，并点击确认按钮
>>>        element = self.browser.find_element_by_class_name("geetest_widget")
>>>        for location in locations:
>>>            action = ActionChains(self.browser).move_to_element_with_offset(element,location[0],location[1]).click()
>>>            action.perform()
>>>            time.sleep(1)
>>>        button = self.get_button('geetest_commit_tip')
>>>        button.click()

>>>    def resize_img(self,image):
>>>        # 改变图片尺寸
>>>        (x, y) = image.size
>>>        image = image.resize((x, y), Image.ANTIALIAS)
>>>        return image

>>>    def sort_by_chaojiying(self,image):
>>>        image = self.resize_img(image)

>>>        # 超级鹰处理验证码识别
>>>        bytes_array = BytesIO()
>>>        image.save(bytes_array,format="PNG")
>>>        result = self.chaojiying.PostPic(
>>>            bytes_array.getvalue(),CHAOJIYING_TYPE
>>>        )
>>>        return result

>>>    def sort_random_geetest(self):
>>>        # 获取提示
>>>        try:
>>>            image2 = self.get_geetest_image('geetest_canvas_img')
>>>        except TimeoutException as e:
>>>            image2 = None
>>>        try:
>>>            tip = self.get_img_position("geetest_tip_img")
>>>        except TimeoutException as e:
>>>            tip = None

>>>        if image2:
>>>            image1 = self.get_screenshot()
>>>            slider = self.get_button('geetest_slider_button')
>>>            slider.click()

>>>            gap = self.get_gap(image1=image1, image2=image2)
>>>            track = self.get_track(gap)
>>>            print(track)
>>>            self.move_to_gap(slider, track)
>>>        elif tip:
>>>            git_img = self.get_geetest_image("geetest_widget")
>>>            result = self.sort_by_chaojiying(image=git_img)
>>>            locations = self.get_points(result)
>>>            self.click_locations(locations)

>>>    def crack_geek(self):
>>>        # 第一步，先输入用户名和密码
>>>        self.browser.get(self.url)
>>>        self.sort_username_password()

>>>        # 第二步，完成点击验证
>>>        button = self.get_button('geetest_radar_tip_content')
>>>        button.click()

>>>        # 第三部，完成随机验证
>>>        self.sort_random_geetest()

>>>if __name__ == '__main__':
>>>    gs = Geetest_sample('test','test')
>>>    gs.crack_geek()

参考资料

---

• https://blog.csdn.net/u010138758/article/details/80152151 J-Ombudsman
• https://www.cnblogs.com/zhuluqing/p/8832205.html moisiet
• https://www.runoob.com 菜鸟教程
• http://www.tulingxueyuan.com/ 北京图灵学院
• http://www.imooc.com/article/19184?block_id=tuijian_wz#child_5_1 两点水
• https://blog.csdn.net/weixin_44213550/article/details/91346411 python老菜鸟
• https://realpython.com/python-string-formatting/ Dan Bader
• https://www.liaoxuefeng.com/ 廖雪峰
• https://blog.csdn.net/Gnewocean/article/details/85319590 新海说
• https://www.cnblogs.com/Nicholas0707/p/9021672.html Nicholas
• https://www.cnblogs.com/dalaoban/p/9331113.html 超天大圣
• https://blog.csdn.net/zhubao124/article/details/81662775 zhubao124
• https://blog.csdn.net/z59d8m6e40/article/details/72871485 z59d8m6e40
• https://www.jianshu.com/p/2b04f5eb5785 MR_ChanHwang
• 《Python学习手册》Mark Lutz
• 《Python编程 从入门到实践》Eric Matthes
• 《Python3网络爬虫开发实战》崔庆才

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本文作者：大师兄(superkmi)