【Scrapy】绕过反爬虫策略和存储（二）

作者: 是Jonathan | 来源:发表于2017-03-25 22:24 被阅读625次

Scrapy原理

Scrapy中的数据流由执行引擎控制，其过程如下：
1.引擎打开一个网站(open a domain)，找到处理该网站的Spider并向该Spider请求第一个要爬取的URL(s)
2.引擎从Spider中获取到第一个要爬取的URL并在调度器(Scheduler)以Request调度。
3.引擎向调度器请求下一个要爬取的URL。
4.调度器返回下一个要爬取的URL给引擎，引擎将URL通过下载器中间件(请求(request)方向)转发给下载器(Downloader)。
5.一旦页面下载完毕，下载器生成一个该页面的Response，并将其通过下载中间件(返回(response))发送给引擎。
6.引擎从下载器中接收到Response并通过Spider中间件(输入方向)发送给Spider处理。
7.Spider处理Response并返回爬取到的item及(跟进的)新的Request给引擎。
8.引擎将(Spider返回的)爬取到的item给item Pipeline，将(Spider返回的)Request给调度器
9.(从第二步)重复直到调度器中没有更多地Request，引擎关闭该网站。

0x01 过反爬虫策略
1.设置延迟下载
download_delay参数，在settings.py文件中设置
2.禁止Cookie
在settings.py中设置COOKIES_ENABLES=False。也就是不启用cookies middleware，不想web server发送cookies。
3.使用user agent池
修改settings.py配置USER_AGENTS和PROXIES
a)：添加USER_AGENTS
USER_AGENTS = [ "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; AcooBrowser; .NET CLR 1.1.4322; .NET CLR 2.0.50727)", "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; Acoo Browser; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.04506)", "Mozilla/4.0 (compatible; MSIE 7.0; AOL 9.5; AOLBuild 4337.35; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)", "Mozilla/5.0 (Windows; U; MSIE 9.0; Windows NT 9.0; en-US)", "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET CLR 2.0.50727; Media Center PC 6.0)", "Mozilla/5.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET CLR 1.0.3705; .NET CLR 1.1.4322)", "Mozilla/4.0 (compatible; MSIE 7.0b; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.2; .NET CLR 3.0.04506.30)", "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN) AppleWebKit/523.15 (KHTML, like Gecko, Safari/419.3) Arora/0.3 (Change: 287 c9dfb30)", "Mozilla/5.0 (X11; U; Linux; en-US) AppleWebKit/527+ (KHTML, like Gecko, Safari/419.3) Arora/0.6", "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.2pre) Gecko/20070215 K-Ninja/2.1.1", "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9) Gecko/20080705 Firefox/3.0 Kapiko/3.0", "Mozilla/5.0 (X11; Linux i686; U;) Gecko/20070322 Kazehakase/0.4.5", "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8) Gecko Fedora/1.9.0.8-1.fc10 Kazehakase/0.5.6", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/535.20 (KHTML, like Gecko) Chrome/19.0.1036.7 Safari/535.20", "Opera/9.80 (Macintosh; Intel Mac OS X 10.6.8; U; fr) Presto/2.9.168 Version/11.52", ]
所谓的user agent，是指包含浏览器信息、操作系统信息等的一个字符串，也称之为一种特殊的网络协议。服务器通过它判断当前访问对象是浏览器、邮件客户端还是网络爬虫。

4.使用IP池
web server应对爬虫的策略之一就是直接将你的IP或者是整个IP段都封掉禁止访问，这时候，当IP封掉后，转换到其他的IP继续访问即可。
b)：添加代理IP设置PROXIES
PROXIES = [ {'ip_port': '111.11.228.75:80', 'user_pass': ''}, {'ip_port': '120.198.243.22:80', 'user_pass': ''}, {'ip_port': '111.8.60.9:8123', 'user_pass': ''}, {'ip_port': '101.71.27.120:80', 'user_pass': ''}, {'ip_port': '122.96.59.104:80', 'user_pass': ''}, {'ip_port': '122.224.249.122:8088', 'user_pass': ''}, ]
代理IP可以网上搜索一下，上面的代理IP获取自：http://www.xici.net.co/。

5.分布式爬取
采用分布式爬取。此处暂时不说。

0x02 存储
采用MongoDB数据存储爬取的漏洞数据。

代码示例部分

pipelines.py文件中代码

# -*- coding: utf-8 -*-

# Define your item pipelines here
#
# Don't forget to add your pipeline to the ITEM_PIPELINES setting
# See: http://doc.scrapy.org/en/latest/topics/item-pipeline.html
import json
import codecs
import pymongo
from scrapy.conf import settings
from vuls360.items import Vuls360Item

class Vuls360Pipeline(object):
    '''
    def __init__(self):
        self.file = codecs.open('vul.json', 'wb', encoding='utf-8')

    def process_item(self, item, spider):
        line = json.dumps(dict(item)) + '\n'  
        self.file.write(line.decode("unicode_escape")) 
        return item
    '''

    def __init__(self):
        host = settings['MONGODB_HOST']
        port = settings['MONGODB_PORT']
        dbname = settings['MONGODB_DBNAME']  # 数据库名
        client = pymongo.MongoClient(host=host, port=port)
        tdb = client[dbname]
        self.port = tdb[settings['MONGODB_DOCNAME']]  # 表名

    def process_item(self, item, spider):
        vul_info = dict(item)
        self.port.insert(vul_info)
        return item

settings.py文件中代码

# -*- coding: utf-8 -*-

BOT_NAME = 'vuls360'

SPIDER_MODULES = ['vuls360.spiders']
NEWSPIDER_MODULE = 'vuls360.spiders'


# Crawl responsibly by identifying yourself (and your website) on the user-agent
#USER_AGENT = 'vuls360 (+http://www.yourdomain.com)'

# Obey robots.txt rules
ROBOTSTXT_OBEY = True

# Configure maximum concurrent requests performed by Scrapy (default: 16)
#CONCURRENT_REQUESTS = 32

# Configure a delay for requests for the same website (default: 0)
# See http://scrapy.readthedocs.org/en/latest/topics/settings.html#download-delay
# See also autothrottle settings and docs
DOWNLOAD_DELAY = 3
# The download delay setting will honor only one of:
#CONCURRENT_REQUESTS_PER_DOMAIN = 16
#CONCURRENT_REQUESTS_PER_IP = 16

# Disable cookies (enabled by default)
COOKIES_ENABLED = False

# Disable Telnet Console (enabled by default)
#TELNETCONSOLE_ENABLED = False

# Override the default request headers:
#DEFAULT_REQUEST_HEADERS = {
#   'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
#   'Accept-Language': 'en',
#}

# Enable or disable spider middlewares
# See http://scrapy.readthedocs.org/en/latest/topics/spider-middleware.html
#SPIDER_MIDDLEWARES = {
#    'vuls360.middlewares.Vuls360SpiderMiddleware': 543,
#}

# Enable or disable downloader middlewares
# See http://scrapy.readthedocs.org/en/latest/topics/downloader-middleware.html
DOWNLOADER_MIDDLEWARES = {
   'vuls360.middlewares.RandomUserAgent': 543,
}

# Configure item pipelines
# See http://scrapy.readthedocs.org/en/latest/topics/item-pipeline.html
ITEM_PIPELINES = {
    'vuls360.pipelines.Vuls360Pipeline': 30,
}

#save to mongdodb
# MONGO_URI = 'mongodb://127.0.0.1:27017'
MONGODB_HOST = '127.0.0.1:'
MONGODB_PORT = 27017
MONGODB_DBNAME = 'vuls360'
MONGODB_DOCNAME = 'vuls360_info'

USER_AGENTS = [
    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; AcooBrowser; .NET CLR 1.1.4322; .NET CLR 2.0.50727)",
    "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; Acoo Browser; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.04506)",
    "Mozilla/4.0 (compatible; MSIE 7.0; AOL 9.5; AOLBuild 4337.35; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)",
    "Mozilla/5.0 (Windows; U; MSIE 9.0; Windows NT 9.0; en-US)",
    "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET CLR 2.0.50727; Media Center PC 6.0)",
    "Mozilla/5.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET CLR 1.0.3705; .NET CLR 1.1.4322)",
    "Mozilla/4.0 (compatible; MSIE 7.0b; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.2; .NET CLR 3.0.04506.30)",
    "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN) AppleWebKit/523.15 (KHTML, like Gecko, Safari/419.3) Arora/0.3 (Change: 287 c9dfb30)",
    "Mozilla/5.0 (X11; U; Linux; en-US) AppleWebKit/527+ (KHTML, like Gecko, Safari/419.3) Arora/0.6",
    "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.2pre) Gecko/20070215 K-Ninja/2.1.1",
    "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9) Gecko/20080705 Firefox/3.0 Kapiko/3.0",
    "Mozilla/5.0 (X11; Linux i686; U;) Gecko/20070322 Kazehakase/0.4.5",
    "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8) Gecko Fedora/1.9.0.8-1.fc10 Kazehakase/0.5.6",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11",
    "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/535.20 (KHTML, like Gecko) Chrome/19.0.1036.7 Safari/535.20",
    "Opera/9.80 (Macintosh; Intel Mac OS X 10.6.8; U; fr) Presto/2.9.168 Version/11.52",
]

爬虫文件代码vuls.py:

class VulsSpider(scrapy.Spider):
    name = "vuls"
    allowed_domains = ["bobao.360.cn"]
    start_urls = ['http://bobao.360.cn/vul/index?type=all&page=']
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36',
    }

    def parse(self, response):
        start_urls = 'http://bobao.360.cn/vul/index?type=all&page='
        pages = response.xpath('/html/body/div[2]/div[2]/div[2]/div[1]/div/div[3]/div/ul/li[8]/a/@href').extract()[0].split('=')[2]
        # for page in range(1,int(pages)+1):
        for page in range(1, 5):
            url = 'http://bobao.360.cn/vul/index?type=all&page={}'.format(page)
            # print url
            yield scrapy.Request(url, self.parse_detail)  # , headers=self.headers)

    def parse_detail(self, response):
        vuls = response.xpath('/html/body/div[2]/div[2]/div[2]/div[1]/div/div[3]/ul/li')
        # print vuls
        for vul in vuls:
            label_danger = vul.xpath('.//div/div/span/text()').extract()[0] if len( \
                vul.xpath('.//div/div/span/text()').extract()) else "null"
            yield {
                'url': 'http://bobao.360.cn' + vul.xpath('.//div/div/a/@href').extract()[0],
                'title': vul.xpath('.//div/div/a/text()').extract()[0],
                'label_danger': label_danger,
                'ori': vul.xpath('.//div/span[2]/text()').extract()[0],
            }

参考：
http://www.tuicool.com/articles/VRfQR3U
Scrapy的wiki资料
http://wiki.jikexueyuan.com/project/scrapy

定义user-agent池&****Scrapy HTTP代理
http://www.2cto.com/os/201406/312688.html
https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&tn=baidu&wd=scrapy%20agent&oq=scrapy%25E6%2589%25A9%25E5%25B1%2595&rsv_pq=fee1578b0000ca7a&rsv_t=6a10nCV%2Fwr3THCK7rFn%2FH8Pmru%2F%2FcsmS%2BBr8Y%2FeWNzi9dBSZjm5ZvNZOYqY&rqlang=cn&rsv_enter=1&rsv_sug3=9&rsv_sug1=6&rsv_sug7=100&rsv_sug2=0&inputT=5409&rsv_sug4=5722
https://github.com/jackgitgz/CnblogsSpider

Scrapy存储
http://blog.csdn.net/u012150179?viewmode=contents
使用MongoDB

#删除数据库操作
> use vuls360
switched to db vuls360
> db.dropDatabase()
{ "dropped" : "vuls360", "ok" : 1 }
#查看爬虫数据
> use vuls360
switched to db vuls360
> show collections
system.indexes
vuls360_info
> db.vuls360_info.find()

Scrapy默认情况下深度优先顺序，也可以设置广度优先
DEPTH_PRIORITY = 1
SCHEDULER_DISK_QUEUE = 'scrapy.squeue.PickleFifoDiskQueue'
SCHEDULER_MEMORY_QUEUE = 'scrapy.squeue.FifoMemoryQueue'

xpath和selector选择器的资料
http://www.cnblogs.com/lonenysky/p/4649455.html
http://www.cnblogs.com/sufei-duoduo/p/5868027.html
xpath和lxml的相关资料
http://cuiqingcai.com/2621.html

其他爬虫
https://www.figotan.org/2016/08/10/pyspider-as-a-web-crawler-system/

【Scrapy】绕过反爬虫策略和存储（二）

代码示例部分

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