scrapy - Web刮板添加额外的字段，但刮板不会刮字段(Web scraper add extra field but scraper will not scrape field)

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scrapy - Web刮板添加额外的字段，但刮板不会刮字段(Web scraper add extra field but scraper will not scrape field)

asked Feb 21, 2021 in Technique[技术] by 深蓝 (71.8m points)

scrapy - Web刮板添加额外的字段，但刮板不会刮字段(Web scraper add extra field but scraper will not scrape field)

I have a web scraper coded for me using scrapy.

(我有一个使用scrapy为我编写的网络刮板。)

I wish to add an extra field from the website the scraper is scraping from.

(我希望在刮板正在刮擦的网站上添加一个额外的字段。)

The column header "Description" is created in the CSV database but nothing is scraped.

(在CSV数据库中创建了列标题“描述”，但未刮任何内容。)

Below is the code (I have tried to DIY but nothing)

(下面是代码（我尝试过自己动手做，但是什么也没做）)

# -*- coding: utf-8 -*-
import scrapy
from pydispatch import dispatcher
from scrapy.signalmanager import SignalManager
import csv,re
from scrapy import signals
class Rapid7(scrapy.Spider):
    name = 'vulns'
    allowed_domains = ['rapid7.com']
    main_url = 'https://www.rapid7.com/db/?q=&type=nexpose&page={}'
    #start_urls = ['https://www.rapid7.com/db/vulnerabilities']
    keys = ['Published','CVEID', 'Added', 'Modified', 'Related', 'Severity', 'CVSS', 'Created', 'Solution', 'References', 'Description', 'URL']
    def __init__(self):
        SignalManager(dispatcher.Any).connect(receiver=self._close, signal=signals.spider_closed)
    def start_requests(self):
        for i in range(1,10):
            url = self.main_url.format(i)
            yield scrapy.Request(url,callback=self.parse)
    def parse(self, response):
        flag = True
        temp = response.xpath('//div[@class="vulndb__intro-content"]/p/text()').extract_first()
        if temp:
            if temp.strip()=='An error occurred.':
                flag= False
        temp = [i for i in response.xpath('//*[@class="results-info"]/parent::div/p/text()').extract()if i.strip()]
        if len(temp)==1:
            flag= False
        if flag:
            for article in response.xpath('//*[@class="vulndb__results"]/a/@href').extract():
                yield scrapy.Request(response.urljoin(article), callback=self.parse_article, dont_filter=True)

    def parse_article(self,response):
        item=dict()
        item['Published'] = item['Added'] = item['Modified'] = item['Related'] = item['Severity'] = item['Description'] =''
        r=response.xpath('//h1[text()="Related Vulnerabilities"]/..//a/@href').extract()
        temp = response.xpath('//meta[@property="og:title"]/@content').extract_first()
        item['CVEID'] = ''
        try:
            temp2 = re.search('(CVE-.*-d*)',temp).groups()[0]
            if ":" in temp2:
                raise KeyError
        except:
            try:
                temp2 = re.search('(CVE-.*):',temp).groups()[0]
            except:
                temp2 = ''
        if temp2:
            item['CVEID'] = temp2.replace(': Important',"").replace(')','')
        table = response.xpath('//section[@class="tableblock"]/div')
        for row in table:
            header = row.xpath('header/text()').extract_first()
            data = row.xpath('div/text()').extract_first()
            item[header]=data
        temp = [i for i in response.xpath('//div[@class="vulndb__related-content"]//text()').extract() if i.strip()]
        for ind,i in enumerate(temp):
            if "CVE" in i:
                temp[ind] = i.replace(' ','')

        item['Related']= ", ".join(temp) if temp else ""
        temp2= [i for i in response.xpath('//h4[text()="Solution(s)"]/parent::*/ul/li/text()').extract() if i.strip()]
        item['Solution'] =", ".join(temp2) if temp2 else ''
        temp3 = [i for i in response.xpath('//h4[text()="References"]/parent::*/ul/li/text()').extract() if i.strip()]
        item['References'] = ", ".join(temp3) if temp3 else ''
        temp4 = [i for i in response.xpath('//h4[text()="Description"]/parent::*/ul/li/text()').extract() if i.strip()]
        item['Description'] = ", ".join(temp4) if temp4 else ''
        item['URL'] = response.request.url
        new_item=dict()
        for key in self.keys:
            if key not in list(item.keys()):
                new_item[key] = ''
            else:
                new_item[key]=item[key]
        yield new_item

    def _close(self):
        print("Done Scraping")

Thanks.

(谢谢。)

STACKOVERFLOW wanted me to add extra text so here it is please ignore.