120 lines
4 KiB
Python
120 lines
4 KiB
Python
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from html.parser import HTMLParser
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from random import sample
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from requests import get as request_get
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from sys import stderr
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from urllib.parse import urlparse
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class _HTMLExternalLinkFinder(HTMLParser):
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links = []
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def handle_starttag(self, tag, attrs):
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if tag == "a":
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for a in attrs:
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attr, val = a
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if attr == "href":
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if val.startswith("https://") or val.startswith("http://"):
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if not val in self.links:
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self.links.append(val)
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def get_links(self, input_html:str):
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self.feed(input_html)
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return self.links
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class LinkMap:
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links = []
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link_connections = [
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# (link1, link2)
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]
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def add_link_connection(self, link1, link2):
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if not link1 in self.links:
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self.links.append(link1)
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if not link2 in self.links:
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self.links.append(link2)
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self.link_connections.append((link1, link2))
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def add_link(self, link):
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if not link in self.links:
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self.links.append(link)
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class LinkMapFromSitelinksGenerator:
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site_request_max_len = 10000000 # bytes
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site_request_timeout = 10 # seconds
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already_visited = []
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generated_linkmap = LinkMap()
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max_links_per_site = 3
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max_depth = 3
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enable_log = False
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def log(self, something):
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if self.enable_log:
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print(something, file=stderr)
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def _get_html(self, url:str) -> str:
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html_content = ""
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# receive up to self.site_request_max_len bytes after a maximum of self.site_request_timeout seconds
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self.log("-----" + url)
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response = request_get(url, stream=True, timeout=self.site_request_timeout)
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response.raise_for_status()
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content_size = 0
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content_chunks = []
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for chunk in response.iter_content(1024, decode_unicode=True):
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content_size += len(chunk)
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if content_size > self.site_request_max_len:
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self.log(f"Maximum content length exceeded! received: {content_size} (maximum: {self.site_request_max_len})")
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break
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else:
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content_chunks.append(chunk)
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html_content = "".join(content_chunks)
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return html_content
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def _get_linked_sites(self, url:str):
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sites = []
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if not url in self.already_visited:
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try:
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html = self._get_html(url)
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found_links = _HTMLExternalLinkFinder().get_links(html)
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found_links = sample(found_links, min(self.max_links_per_site, len(found_links)))
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self.log("\n".join(found_links))
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for l in found_links:
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if l != None:
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sites.append(l)
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self.already_visited.append(url)
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except KeyboardInterrupt:
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exit("KeyboardInterrupt")
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except Exception as e:
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self.log("An exception occcured while trying to get links from '" + url + "': ")
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self.log(e)
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return sites
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def _generate_linkmap(self, start_urls:list, _current_depth:int):
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linkdict = {}
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for url in start_urls:
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linkdict[url] = {}
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self.generated_linkmap.add_link(url)
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linked_sites = self._get_linked_sites(url)
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for l in linked_sites:
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if l != url:
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linkdict[url][l] = {}
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self.generated_linkmap.add_link_connection(url, l)
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if _current_depth < self.max_depth:
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for url in linkdict:
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linkdict[url] = self._generate_linkmap(list(linkdict[url]), _current_depth + 1)
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def generate(self, start_url:str, max_depth:int=3, max_links_per_site:int=3):
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self.already_visited = []
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self.generated_linkmap = LinkMap()
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self.max_links_per_site = max_links_per_site
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self.max_depth = max_depth
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self._generate_linkmap([start_url], 1)
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def get_linkmap(self) -> LinkMap:
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return self.generated_linkmap
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