167 lines
6.6 KiB
Python
167 lines
6.6 KiB
Python
from distutils.filelist import findall
|
|
from operator import truediv
|
|
import re
|
|
import time
|
|
import urllib.request
|
|
from urllib import robotparser
|
|
from urllib.parse import urlparse
|
|
from urllib.parse import urljoin
|
|
from bs4 import BeautifulSoup
|
|
from robotsokay import *
|
|
|
|
def scraper(url, resp):
|
|
|
|
links = extract_next_links(url, resp)
|
|
|
|
|
|
links_valid = set()
|
|
valid_links = open("valid_links.txt",'a')
|
|
invalid_links = open("invalid_links.txt",'a')
|
|
|
|
tic = time.perf_counter()
|
|
|
|
for link in links:
|
|
if is_valid(link):
|
|
links_valid.add(link)
|
|
valid_links.write(link + "\n")
|
|
else:
|
|
invalid_links.write("From: " + url + "\n")
|
|
invalid_links.write(link + "\n")
|
|
pass
|
|
|
|
toc = time.perf_counter()
|
|
#print(f"Took {toc - tic:0.4f} seconds to validate !!!")
|
|
|
|
return links_valid
|
|
|
|
def extract_next_links(url, resp):
|
|
# Implementation required.
|
|
# url: the URL that was used to get the page
|
|
# resp.url: the actual url of the page
|
|
# resp.status: the status code returned by the server. 200 is OK, you got the page. Other numbers mean that there was some kind of problem.
|
|
# resp.error: when status is not 200, you can check the error here, if needed.
|
|
# resp.raw_response: this is where the page actually is. More specifically, the raw_response has two parts:
|
|
# resp.raw_response.url: the url, again
|
|
# resp.raw_response.content: the content of the page!
|
|
# Return a list with the hyperlinks (as strings) scrapped from resp.raw_response.content
|
|
pages = set()
|
|
if resp.status == 200:
|
|
#do stuff
|
|
soup = BeautifulSoup(resp.raw_response.content,'lxml')
|
|
#tempFile = open("test.txt", 'a')
|
|
#Getting all the links, href = true means at least theres a href value, dont know what it is yet
|
|
for link in soup.find_all('a', href=True):
|
|
#There is a lot of relative paths stuff here gotta add them
|
|
href_link = link.get('href')
|
|
|
|
#Relative path
|
|
##Suprisingly index fail safe
|
|
#some <a href> give //thenlink.com...
|
|
if href_link.startswith("//"):
|
|
href_link = href_link[2:]
|
|
|
|
#Relative path fixing
|
|
if(href_link.startswith("/")):
|
|
href_link = urljoin(url,href_link)
|
|
|
|
if(href_link.startswith("www.")):
|
|
href_link = "https://" + href_link
|
|
|
|
#skipping query with specific actions which mutate the websites and cause a trap
|
|
if "do=" in href_link:
|
|
continue
|
|
|
|
# don't know if this is too expensive, otherwise idk
|
|
# takes parsed url and if not ok on robots goes next, else we can write file
|
|
|
|
"""
|
|
#For now robot checking too time expensive and incorrectly implemented
|
|
parsed = urlparse(href_link)
|
|
tic = time.perf_counter()
|
|
print(parsed)
|
|
if not robots_are_ok(parsed):
|
|
continue
|
|
toc = time.perf_counter()
|
|
print(f"Took {toc - tic:0.4f} seconds to robots_are_ok !!!")
|
|
"""
|
|
|
|
#tempFile.write(href_link + "\n")
|
|
#Adding to the boi wonder pages
|
|
pages.add(href_link)
|
|
else:
|
|
print("Page error !")
|
|
return pages
|
|
|
|
#*.ics.uci.edu/*
|
|
#*.cs.uci.edu/*
|
|
#*.informatics.uci.edu/*
|
|
#*.stat.uci.edu/*
|
|
#today.uci.edu/department/information_computer_sciences/*
|
|
|
|
def is_valid(url):
|
|
|
|
|
|
# Decide whether to crawl this url or not.
|
|
# If you decide to crawl it, return True; otherwise return False.
|
|
# There are already some conditions that return False.
|
|
|
|
try:
|
|
#Gotta check if they are in the domain
|
|
parsed = urlparse(url)
|
|
url_parsed_path = parsed.path.lower() # this may help speed things up a little bit (less calls to parsed.path)
|
|
if parsed.scheme not in set(["http", "https"]):
|
|
return False
|
|
elif re.match(
|
|
r".*\.(css|js|bmp|gif|jpe?g|ico"
|
|
+ r"|png|tiff?|mid|mp2|mp3|mp4"
|
|
+ r"|wav|avi|mov|mpeg|ram|m4v|mkv|ogg|ogv|pdf"
|
|
+ r"|ps|eps|tex|ppt|pptx|doc|docx|xls|xlsx|names"
|
|
+ r"|data|dat|exe|bz2|tar|msi|bin|7z|psd|dmg|iso"
|
|
+ r"|epub|dll|cnf|tgz|sha1"
|
|
+ r"|thmx|mso|arff|rtf|jar|csv"
|
|
+ r"|rm|smil|wmv|swf|wma|zip|rar|gz)$",parsed.path.lower()):
|
|
return False
|
|
elif not re.match(
|
|
r".*ics.uci.edu/.*"
|
|
+ r"|.*cs.uci.edu/.*"
|
|
+ r"|.*informatics.uci.edu/.*"
|
|
+ r"|.*stat.uci.edu/.*"
|
|
+ r"|today.uci.edu/department/information_computer_sciences/.*",url):
|
|
return False
|
|
elif parsed.fragment:
|
|
return False
|
|
|
|
#ics.uci.edu accepts physics ... So we gotta get rid of it same with eecs and cs
|
|
if re.match(
|
|
r".*physics.uci.edu/.*"
|
|
+ r"|.*eecs.uci.edu/.*",url) :
|
|
return False
|
|
# https://support.archive-it.org/hc/en-us/articles/208332963-Modify-crawl-scope-with-a-Regular-Expression
|
|
# length check for looping filters and queries (could add hash check for similarity or regex, but don't know if we want to as this works well enought)
|
|
# we can adjust it based on what the cralwer does as well
|
|
if len(url) > 250:
|
|
return False
|
|
# this fixes any search box that keeps going page to page, currenty allow a depth of 2 filters
|
|
if re.match(r".*(&filter%.*){3,}",url_parsed_path):
|
|
return False
|
|
# this is for urls which when opened, download a file (do we want to download these files and tokenize them)
|
|
# elif re.match(r"^.*\&format=(\D{3,4})\Z$",url_parsed_path):
|
|
# return False
|
|
# another looping directory check but more advanced than the one contained in is_a_trap
|
|
if re.match(r"^.*?(/.+?/).*?\1.*$|^.*?/(.+?/)\2.*$",url_parsed_path):
|
|
return False
|
|
# extra directories check (we can add as we find)
|
|
if re.match(r"^.*(/misc|/sites|/all|/themes|/modules|/profiles|/css|/field|/node|/theme){3}.*$", url_parsed_path):
|
|
return False
|
|
# calendar checks plus adding or downloading calendar (ical)
|
|
if re.match(r"^.*calendar.*$",url_parsed_path):
|
|
return False
|
|
if parsed.query.find('ical') != -1:
|
|
return False
|
|
else:
|
|
return True
|
|
|
|
except TypeError:
|
|
print ("TypeError for ", parsed)
|
|
raise
|