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Copy pathcrawler.py
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237 lines (186 loc) · 5.73 KB
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import config
import logging
import re
from urllib.request import urlopen, Request
from urllib.robotparser import RobotFileParser
from urllib.parse import urlparse
from datetime import datetime
import os
class Crawler():
# Variables
parserobots = False
output = None
report = False
config = None
domain = ""
exclude = []
skipext = []
drop = []
debug = False
tocrawl = set([])
crawled = set([])
excluded = set([])
# TODO also search for window.location={.*?}
linkregex = re.compile(b'<a href=[\'|"](.*?)[\'"].*?>')
rp = None
response_code={}
nb_url=1 # Number of url.
nb_rp=0 # Number of url blocked by the robots.txt
nb_exclude=0 # Number of url excluded by extension or word
output_file = None
target_domain = ""
def __init__(self, parserobots=False, output=None, report=False ,domain="", exclude=[], skipext=[], drop=[], debug=False):
self.parserobots = parserobots
self.output = output
self.report = report
self.domain = domain
self.exclude = exclude
self.skipext = skipext
self.drop = drop
self.debug = debug
if self.debug:
logging.basicConfig(level=logging.DEBUG)
self.tocrawl = set([domain])
try:
self.target_domain = urlparse(domain)[1]
except:
raise ("Invalid domain")
if self.output:
try:
self.output_file = open(self.output, 'w')
except:
logging.debug ("Output file not available.")
exit(255)
def run(self):
print (config.xml_header, file=self.output_file)
logging.debug("Start the crawling process")
self.__crawling()
logging.debug("Crawling as reach the end of all found link")
print (config.xml_footer, file=self.output_file)
def __crawling(self):
crawling = self.tocrawl.pop()
url = urlparse(crawling)
self.crawled.add(crawling)
request = Request(crawling, headers={"User-Agent":config.crawler_user_agent})
try:
response = urlopen(request)
except Exception as e:
if hasattr(e,'code'):
if e.code in self.response_code:
self.response_code[e.code]+=1
else:
self.response_code[e.code]=1
logging.debug ("{1} ==> {0}".format(e, crawling))
return self.__continue_crawling()
# Read the response
try:
msg = response.read()
if response.getcode() in self.response_code:
self.response_code[response.getcode()]+=1
else:
self.response_code[response.getcode()]=1
response.close()
# Get the last modify date
if 'last-modified' in response.headers:
date = response.headers['Last-Modified']
else:
date = response.headers['Date']
date = datetime.strptime(date, '%a, %d %b %Y %H:%M:%S %Z')
except Exception as e:
logging.debug ("{1} ===> {0}".format(e, crawling))
return self.__continue_crawling()
print ("<url><loc>"+url.geturl()+"</loc><lastmod>"+date.strftime('%Y-%m-%dT%H:%M:%S')+"</lastmod></url>", file=self.output_file)
if self.output_file:
self.output_file.flush()
# Found links
links = self.linkregex.findall(msg)
for link in links:
link = link.decode("utf-8")
#logging.debug("Found : {0}".format(link))
if link.startswith('/'):
link = 'http://' + url[1] + link
elif link.startswith('#'):
link = 'http://' + url[1] + url[2] + link
elif not link.startswith('http'):
link = 'http://' + url[1] + '/' + link
# Remove the anchor part if needed
if "#" in link:
link = link[:link.index('#')]
# Drop attributes if needed
for toDrop in self.drop:
link=re.sub(toDrop,'',link)
# Parse the url to get domain and file extension
parsed_link = urlparse(link)
domain_link = parsed_link.netloc
target_extension = os.path.splitext(parsed_link.path)[1][1:]
if (link in self.crawled):
continue
if (link in self.tocrawl):
continue
if (link in self.excluded):
continue
if (domain_link != self.target_domain):
continue
if ("javascript" in link):
continue
# Count one more URL
self.nb_url+=1
# Check if the navigation is allowed by the robots.txt
if (not self.can_fetch(link)):
self.exclude_link(link)
self.nb_rp+=1
continue
# Check if the current file extension is allowed or not.
if (target_extension in self.skipext):
self.exclude_link(link)
self.nb_exclude+=1
continue
# Check if the current url doesn't contain an excluded word
if (not self.exclude_url(link)):
self.exclude_link(link)
self.nb_exclude+=1
continue
self.tocrawl.add(link)
return self.__continue_crawling()
def __continue_crawling(self):
if self.tocrawl:
self.__crawling()
def exclude_link(self,link):
if link not in self.excluded:
self.excluded.add(link)
def checkRobots(self):
if self.domain[len(self.domain)-1] != "/":
self.domain += "/"
request = Request(self.domain+"robots.txt", headers={"User-Agent":config.crawler_user_agent})
self.rp = RobotFileParser()
self.rp.set_url(self.domain+"robots.txt")
self.rp.read()
def can_fetch(self, link):
try:
if self.parserobots:
if self.rp.can_fetch("*", link):
return True
else:
logging.debug ("Crawling of {0} disabled by robots.txt".format(link))
return False
if not self.parserobots:
return True
return True
except:
# On error continue!
logging.debug ("Error during parsing robots.txt")
return True
def exclude_url(self, link):
for ex in self.exclude:
if ex in link:
return False
return True
def make_report(self):
print ("Number of found URL : {0}".format(self.nb_url))
print ("Number of link crawled : {0}".format(len(self.crawled)))
if self.parserobots:
print ("Number of link block by robots.txt : {0}".format(self.nb_rp))
if self.skipext or self.exclude:
print ("Number of link exclude : {0}".format(self.nb_exclude))
for code in self.response_code:
print ("Nb Code HTTP {0} : {1}".format(code, self.response_code[code]))