df0b7afa50
This moves away from the previous (messy) approach of using two separate keys for decrypting text and element URLs separately and regenerating them for new searches. The current implementation of sessions is not very reliable, which lead to keys being regenerated too soon, which would break page navigation. Until that can be addressed, the single key per session approach should work a lot better. Fixes #250 Fixes #90
256 lines
8.9 KiB
Python
256 lines
8.9 KiB
Python
from app.request import VALID_PARAMS
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from app.utils.results import *
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from bs4 import BeautifulSoup
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from bs4.element import ResultSet, Tag
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from cryptography.fernet import Fernet
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import re
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import urllib.parse as urlparse
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from urllib.parse import parse_qs
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class Filter:
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def __init__(self, user_key: str, mobile=False, config=None) -> None:
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if config is None:
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config = {}
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self.near = config['near'] if 'near' in config else ''
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self.dark = config['dark'] if 'dark' in config else False
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self.nojs = config['nojs'] if 'nojs' in config else False
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self.new_tab = config['new_tab'] if 'new_tab' in config else False
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self.alt_redirect = config['alts'] if 'alts' in config else False
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self.mobile = mobile
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self.user_key = user_key
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self.main_divs = ResultSet('')
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self._elements = 0
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def __getitem__(self, name):
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return getattr(self, name)
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@property
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def elements(self):
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return self._elements
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def reskin(self, page: str) -> str:
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# Aesthetic only re-skinning
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if self.dark:
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page = page.replace(
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'fff', '000').replace(
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'202124', 'ddd').replace(
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'1967D2', '3b85ea')
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return page
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def encrypt_path(self, path, is_element=False) -> str:
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# Encrypts path to avoid plaintext results in logs
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if is_element:
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# Element paths are encrypted separately from text, to allow key
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# regeneration once all items have been served to the user
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enc_path = Fernet(self.user_key).encrypt(path.encode()).decode()
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self._elements += 1
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return enc_path
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return Fernet(self.user_key).encrypt(path.encode()).decode()
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def clean(self, soup) -> BeautifulSoup:
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self.main_divs = soup.find('div', {'id': 'main'})
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self.remove_ads()
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self.fix_question_section()
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self.update_styling(soup)
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for img in [_ for _ in soup.find_all('img') if 'src' in _.attrs]:
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self.update_element_src(img, 'image/png')
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for audio in [_ for _ in soup.find_all('audio') if 'src' in _.attrs]:
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self.update_element_src(audio, 'audio/mpeg')
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for link in soup.find_all('a', href=True):
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self.update_link(link)
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input_form = soup.find('form')
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if input_form is not None:
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input_form['method'] = 'POST'
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# Ensure no extra scripts passed through
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for script in soup('script'):
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script.decompose()
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# Update default footer and header
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footer = soup.find('footer')
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if footer:
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# Remove divs that have multiple links beyond just page navigation
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[_.decompose() for _ in footer.find_all('div', recursive=False)
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if len(_.find_all('a', href=True)) > 3]
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header = soup.find('header')
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if header:
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header.decompose()
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return soup
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def remove_ads(self) -> None:
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"""Removes ads found in the list of search result divs
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Returns:
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None (The soup object is modified directly)
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"""
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if not self.main_divs:
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return
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for div in [_ for _ in self.main_divs.find_all('div', recursive=True)]:
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div_ads = [_ for _ in div.find_all('span', recursive=True)
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if has_ad_content(_.text)]
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_ = div.decompose() if len(div_ads) else None
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def fix_question_section(self) -> None:
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"""Collapses the "People Also Asked" section into a "details" element
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These sections are typically the only sections in the results page that
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are structured as <div><h2>Title</h2><div>...</div></div>, so they are
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extracted by checking all result divs for h2 children.
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Returns:
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None (The soup object is modified directly)
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"""
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if not self.main_divs:
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return
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question_divs = [_ for _ in self.main_divs.find_all(
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'div', recursive=False
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) if len(_.find_all('h2')) > 0]
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if len(question_divs) == 0:
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return
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# Wrap section in details element to allow collapse/expand
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details = BeautifulSoup(features='html.parser').new_tag('details')
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summary = BeautifulSoup(features='html.parser').new_tag('summary')
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summary.string = question_divs[0].find('h2').text
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question_divs[0].find('h2').decompose()
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details.append(summary)
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question_divs[0].wrap(details)
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for question_div in question_divs:
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questions = [_ for _ in question_div.find_all(
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'div', recursive=True
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) if _.text.endswith('?')]
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for question in questions:
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question['style'] = 'padding: 10px; font-style: italic;'
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def update_element_src(self, element: Tag, mime: str) -> None:
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"""Encrypts the original src of an element and rewrites the element src
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to use the "/element?src=" pass-through.
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Returns:
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None (The soup element is modified directly)
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"""
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src = element['src']
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if src.startswith('//'):
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src = 'https:' + src
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if src.startswith(LOGO_URL):
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# Re-brand with Whoogle logo
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element['src'] = 'static/img/logo.png'
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element['style'] = 'height:40px;width:162px'
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return
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elif src.startswith(GOOG_IMG) or GOOG_STATIC in src:
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element['src'] = BLANK_B64
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return
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element['src'] = 'element?url=' + self.encrypt_path(
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src,
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is_element=True) + '&type=' + urlparse.quote(mime)
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def update_styling(self, soup) -> None:
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""""""
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# Remove unnecessary button(s)
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for button in soup.find_all('button'):
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button.decompose()
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# Remove svg logos
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for svg in soup.find_all('svg'):
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svg.decompose()
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# Update logo
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logo = soup.find('a', {'class': 'l'})
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if logo and self.mobile:
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logo['style'] = ('display:flex; justify-content:center; '
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'align-items:center; color:#685e79; '
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'font-size:18px; ')
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# Fix search bar length on mobile
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try:
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search_bar = soup.find('header').find('form').find('div')
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search_bar['style'] = 'width: 100%;'
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except AttributeError:
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pass
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def update_link(self, link: Tag) -> None:
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"""Update internal link paths with encrypted path, otherwise remove
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unnecessary redirects and/or marketing params from the url
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Args:
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link: A bs4 Tag element to inspect and update
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Returns:
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None (the tag is updated directly)
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"""
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# Replace href with only the intended destination (no "utm" type tags)
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href = link['href'].replace('https://www.google.com', '')
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if 'advanced_search' in href or 'tbm=shop' in href:
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# FIXME: The "Shopping" tab requires further filtering (see #136)
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# Temporarily removing all links to that tab for now.
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link.decompose()
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return
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elif self.new_tab:
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link['target'] = '_blank'
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result_link = urlparse.urlparse(href)
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query_link = parse_qs(
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result_link.query
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)['q'][0] if '?q=' in href else ''
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if query_link.startswith('/'):
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# Internal google links (i.e. mail, maps, etc) should still
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# be forwarded to Google
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link['href'] = 'https://google.com' + query_link
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elif '/search?q=' in href:
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# "li:1" implies the query should be interpreted verbatim,
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# which is accomplished by wrapping the query in double quotes
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if 'li:1' in href:
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query_link = '"' + query_link + '"'
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new_search = 'search?q=' + self.encrypt_path(query_link)
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query_params = parse_qs(urlparse.urlparse(href).query)
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for param in VALID_PARAMS:
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if param not in query_params:
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continue
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param_val = query_params[param][0]
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new_search += '&' + param + '=' + param_val
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link['href'] = new_search
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elif 'url?q=' in href:
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# Strip unneeded arguments
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link['href'] = filter_link_args(query_link)
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# Add no-js option
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if self.nojs:
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append_nojs(link)
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else:
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link['href'] = href
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# Replace link location if "alts" config is enabled
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if self.alt_redirect:
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# Search and replace all link descriptions
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# with alternative location
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link['href'] = get_site_alt(link['href'])
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link_desc = link.find_all(
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text=re.compile('|'.join(SITE_ALTS.keys())))
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if len(link_desc) == 0:
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return
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# Replace link destination
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link_desc[0].replace_with(get_site_alt(link_desc[0]))
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