您的位置:首页 > 编程语言 > Python开发

路飞学城—Python爬虫实战密训班 第二章

2018-07-09 17:41 106 查看

 

路飞学城—Python爬虫实战密训班 第二章

 

一、Selenium基础

  Selenium是一个第三方模块,可以完全模拟用户在浏览器上操作(相当于在浏览器上点点点)。

  1.安装

    - pip install selenium

  2.优缺点

    - 无需查看和确定请求头请求体等数据细节,直接模拟人点击浏览器的行为

    - 效率不高

  3.依赖驱动:

       - Firefox
        https://github.com/mozilla/geckodriver/releases
       - Chrome
        http://chromedriver.storage.googleapis.com/index.html

  4.与selenium相关的基本操作

from selenium import webdriver

# 配置驱动
#驱动一定要自己下载并放在一个目录,否则会出错

option = webdriver.ChromeOptions()
driver = webdriver.Chrome('/Users/wupeiqi/drivers/chromedriver', chrome_options=option)

# 1. 控制浏览器打开指定页面
driver.get("https://dig.chouti.com/all/hot/recent/1")

# 2. 找到登录按钮
btn_login = driver.find_element_by_xpath('//*[@id="login-link-a"]')
# 3. 点击按钮
btn_login.click()

# 4. 找到手机标签
input_user = driver.find_element_by_xpath('//*[@id="mobile"]')
# 5. 找到密码标签
input_pwd = driver.find_element_by_xpath('//*[@id="mbpwd"]')

# 6. 输入用户名
input_user.send_keys('13121758648')
# 7. 输入密码
input_pwd.send_keys('woshiniba')

# 8. 点击登录按钮
input_submit = driver.find_element_by_xpath(
'//*[@id="footer-band"]/div[5]/div/div/div[1]/div[2]/div[4]/div[2]/div/span[1]')
input_submit.click()

print(driver.get_cookies())

# # 9. 点击跳转
# news = driver.find_element_by_xpath('//*[@id="newsContent20646261"]/div[1]/a[1]')
# # news.click()
# driver.execute_script("arguments[0].click();", news)

# 10.管理浏览器
# driver.close()

  

  

二、破解滑动验证码

  WuSir为我们带来的精彩的讲解,从__main__的主函数调用开始,先讲了图片的截取和距离的测算,接下来分析了怎么模拟人类行为的滑动过程,通过速度和加速度的空值实现,而且会故意制造匹配之后的小幅振动行为,最后点击确定就可以破解该验证码,重点是像素的选择和速度的调节,感谢!

from selenium import webdriver
from selenium.webdriver import ActionChains
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.wait import WebDriverWait
import os
import shutil
from PIL import Image
import time

def get_snap(driver):
driver.save_screenshot('full_snap.png')
page_snap_obj = Image.open('full_snap.png')

return page_snap_obj

def get_image(driver):
img = driver.find_element_by_class_name('geetest_canvas_img')
time.sleep(2)
location = img.location
size = img.size

left = location['x']
top = location['y']
right = left + size['width']
bottom = top + size['height']

page_snap_obj = get_snap(driver)

image_obj = page_snap_obj.crop((left * 2, top * 2, right * 2, bottom * 2))
# image_obj.show()
with open('code.png', 'wb') as f:
image_obj.save(f, format='png')
return image_obj

def get_distance(image1, image2):
# start = 0
# threhold = 70
# for i in range(start, image1.size[0]):
#     for j in range(0, image1.size[1]):
#         rgb1 = image1.load()[i, j]
#         rgb2 = image2.load()[i, j]
#         res1 = abs(rgb1[0] - rgb2[0])
#         res2 = abs(rgb1[1] - rgb2[1])
#         res3 = abs(rgb1[2] - rgb2[2])
#         # print(res1,res2,res3)
#         if not (res1 < threhold and res2 < threhold and res3 < threhold):
#             print(111111, i, j)
#             return i - 13
# print(2222, i, j)
# return i - 13
start = 0
threhold = 70
v = []
for i in range(start, image1.size[0]):
for j in range(0, image1.size[1]):
rgb1 = image1.load()[i, j]
rgb2 = image2.load()[i, j]
res1 = abs(rgb1[0] - rgb2[0])
res2 = abs(rgb1[1] - rgb2[1])
res3 = abs(rgb1[2] - rgb2[2])

if not (res1 < threhold and res2 < threhold and res3 < threhold):
print(i)
if i not in v:
v.append(i)

stop = 0
for i in range(0, len(v)):
val = i + v[0]
if v[i] != val:
stop = v[i]
break

width = stop - v[0]
print(stop, v[0], width)
return width

def get_tracks(distance):
import random
exceed_distance = random.randint(0, 5)
distance += exceed_distance  # 先滑过一点,最后再反着滑动回来
v = 0
t = 0.2
forward_tracks = []

current = 0
mid = distance * 3 / 5
while current < distance:
if current < mid:
a = random.randint(1, 3)
else:
a = random.randint(1, 3)
a = -a
s = v * t + 0.5 * a * (t ** 2)
v = v + a * t
current += s
forward_tracks.append(round(s))

# 反着滑动到准确位置
v = 0
t = 0.2
back_tracks = []

current = 0
mid = distance * 4 / 5
while abs(current) < exceed_distance:
if current < mid:
a = random.randint(1, 3)
else:
a = random.randint(-3, -5)
a = -a
s = -v * t - 0.5 * a * (t ** 2)
v = v + a * t
current += s
back_tracks.append(round(s))
return {'forward_tracks': forward_tracks, 'back_tracks': list(reversed(back_tracks))}

def crack(driver):  # 破解滑动认证
# 1、点击按钮,得到没有缺口的图片
button = driver.find_element_by_xpath('//*[@id="embed-captcha"]/div/div[2]/div[1]/div[3]')
button.click()

# 2、获取没有缺口的图片
image1 = get_image(driver)

# 3、点击滑动按钮,得到有缺口的图片
button = driver.find_element_by_class_name('geetest_slider_button')
button.click()

# 4、获取有缺口的图片
image2 = get_image(driver)

# 5、对比两种图片的像素点,找出位移
distance = get_distance(image1, image2)
print(distance)
#
# 6、模拟人的行为习惯,根据总位移得到行为轨迹
tracks = get_tracks(int(distance / 2))

# 7、按照行动轨迹先正向滑动,后反滑动
button = driver.find_element_by_class_name('geetest_slider_button')
ActionChains(driver).click_and_hold(button).perform()

# 正常人类总是自信满满地开始正向滑动,自信地表现是疯狂加速
for track in tracks['forward_tracks']:
ActionChains(driver).move_by_offset(xoffset=track, yoffset=0).perform()

# 结果傻逼了,正常的人类停顿了一下,回过神来发现,卧槽,滑过了,然后开始反向滑动
time.sleep(0.5)
for back_track in tracks['back_tracks']:
ActionChains(driver).move_by_offset(xoffset=back_track, yoffset=0).perform()
#
# # 小范围震荡一下,进一步迷惑极验后台,这一步可以极大地提高成功率
ActionChains(driver).move_by_offset(xoffset=3, yoffset=0).perform()
ActionChains(driver).move_by_offset(xoffset=-3, yoffset=0).perform()

# # 成功后,骚包人类总喜欢默默地欣赏一下自己拼图的成果,然后恋恋不舍地松开那只脏手
time.sleep(0.5)
ActionChains(driver).release().perform()

def login_luffy(username, password):
driver = webdriver.Chrome('/Users/wupeiqi/drivers/chromedriver')
driver.set_window_size(960, 800)
try:
# 1、输入账号密码回车
driver.implicitly_wait(3)
driver.get('https://www.luffycity.com/login')

input_username = driver.find_element_by_xpath('//*[@id="router-view"]/div/div/div[2]/div[2]/input[1]')
input_pwd = driver.find_element_by_xpath('//*[@id="router-view"]/div/div/div[2]/div[2]/input[2]')

input_username.send_keys(username)
input_pwd.send_keys(password)

# 2、破解滑动认证
crack(driver)

time.sleep(10)  # 睡时间长一点,确定登录成功
finally:
pass
# driver.close()

if __name__ == '__main__':
login_luffy(username='wupeiqi', password='123123123')

  

 

三:总结

              前半段的直播都是由咸湿的,哦不对、是亲切的Alex老师为我们分享了关于职场方面的一些东西,尤其是咸湿的,哦不对、是亲切的Alex老师用他曾经的经历来讲述这些东西,这些经验和思想,听完后对大家讨论得都很热烈,挺受启发的。

 

    通过学习selenium模块,使得部分对于很复杂的爬虫,用selenium做起来还是比较方便的。但如果使用selenium模块的话,对于爬虫程序可以说基本毫无性能可言,一般的解决方案可以通过selenium + 其它模块一起配合使用来相互弥补。最后,WuSir通过selenium 和 PIL模块一起配合使用,破解了极验的滑动验证码、但此方式有个大问题,只能处理简单的图片,对于复杂的图片命中率会不高,面对更加复杂的验证码只能通过打码平台来解决了。

 

内容来自用户分享和网络整理,不保证内容的准确性,如有侵权内容,可联系管理员处理 点击这里给我发消息
标签: