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"""A tool to simplify fetching robots.txt from a large number of websites.
Usage
-----
>>> python fetch_robotstxt.py -l top-10000-websites.txt -d test_data
"""
import argparse
import os
import sys
from urllib.parse import ParseResult, urlparse, urlunparse
import scrapy
from scrapy.crawler import CrawlerProcess
parser = argparse.ArgumentParser(description='Download robots.txt of given websites.')
parser.add_argument('-l', '--list', action='append', dest='websites', help='Adds to the list of websites.')
parser.add_argument('-d', '--destination', action='store', dest='directory',
help='Directory to save robots.txt files.')
args = parser.parse_args()
if not args.directory or not args.websites:
print("Insufficient or invalid argument(s) provided.")
sys.exit()
class RobotstxtSpider(scrapy.Spider):
name = "robotstxt_spider"
def start_requests(self):
for w in args.websites:
if os.path.isfile(w):
with open(w, 'r') as f:
for domain in f:
domain = domain.strip()
yield scrapy.Request(url="https://{}/robots.txt".format(domain), callback=self.parse, errback=self.err_cb)
def parse(self, response):
filename = urlparse(response.url).netloc
if not os.path.exists(args.directory):
os.mkdir(args.directory)
with open(os.path.join(args.directory, filename), 'wb') as f:
f.write(response.body)
def err_cb(self, failure):
request = failure.request
parts = urlparse(request.url)
parts = ParseResult('http', parts.netloc, parts.path, parts.params, parts.query, parts.fragment)
url = urlunparse(parts)
yield scrapy.Request(url=url, callback=self.parse)
process = CrawlerProcess(settings={'ROBOTSTXT_OBEY': False})
process.crawl(RobotstxtSpider)
process.start()
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