151 lines
5.2 KiB
Python
151 lines
5.2 KiB
Python
from app.filter import Filter, get_first_link
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from app.utils.session import generate_user_keys
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from app.request import gen_query
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from bs4 import BeautifulSoup as bsoup
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from cryptography.fernet import Fernet, InvalidToken
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from flask import g
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from typing import Any, Tuple
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import os
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TOR_BANNER = '<hr><h1 style="text-align: center">You are using Tor</h1><hr>'
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def needs_https(url: str) -> bool:
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"""Checks if the current instance needs to be upgraded to HTTPS
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Note that all Heroku instances are available by default over HTTPS, but
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do not automatically set up a redirect when visited over HTTP.
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Args:
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url: The instance url
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Returns:
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bool: True/False representing the need to upgrade
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"""
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https_only = os.getenv('HTTPS_ONLY', False)
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is_heroku = url.endswith('.herokuapp.com')
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is_http = url.startswith('http://')
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return (is_heroku and is_http) or (https_only and is_http)
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class Search:
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"""Search query preprocessor - used before submitting the query or
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redirecting to another site
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Attributes:
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request: the incoming flask request
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config: the current user config settings
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session: the flask user session
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"""
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def __init__(self, request, config, session, cookies_disabled=False):
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method = request.method
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self.request_params = request.args if method == 'GET' else request.form
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self.user_agent = request.headers.get('User-Agent')
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self.feeling_lucky = False
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self.config = config
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self.session = session
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self.query = ''
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self.cookies_disabled = cookies_disabled
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self.search_type = self.request_params.get(
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'tbm') if 'tbm' in self.request_params else ''
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def __getitem__(self, name) -> Any:
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return getattr(self, name)
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def __setitem__(self, name, value) -> None:
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return setattr(self, name, value)
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def __delitem__(self, name) -> None:
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return delattr(self, name)
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def __contains__(self, name) -> bool:
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return hasattr(self, name)
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def new_search_query(self) -> str:
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"""Parses a plaintext query into a valid string for submission
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Also decrypts the query string, if encrypted (in the case of
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paginated results).
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Returns:
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str: A valid query string
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"""
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# Generate a new element key each time a new search is performed
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self.session['fernet_keys']['element_key'] = generate_user_keys(
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cookies_disabled=self.cookies_disabled)['element_key']
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q = self.request_params.get('q')
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if q is None or len(q) == 0:
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return ''
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else:
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# Attempt to decrypt if this is an internal link
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try:
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q = Fernet(
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self.session['fernet_keys']['text_key']
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).decrypt(q.encode()).decode()
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except InvalidToken:
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pass
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# Reset text key
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self.session['fernet_keys']['text_key'] = generate_user_keys(
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cookies_disabled=self.cookies_disabled)['text_key']
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# Strip leading '! ' for "feeling lucky" queries
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self.feeling_lucky = q.startswith('! ')
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self.query = q[2:] if self.feeling_lucky else q
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return self.query
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def generate_response(self) -> Tuple[Any, int]:
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"""Generates a response for the user's query
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Returns:
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Tuple[Any, int]: A tuple in the format (response, # of elements)
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For example, in the case of a "feeling lucky"
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search, the response is a result URL, with no
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encrypted elements to account for. Otherwise, the
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response is a BeautifulSoup response body, with
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N encrypted elements to track before key regen.
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"""
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mobile = 'Android' in self.user_agent or 'iPhone' in self.user_agent
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content_filter = Filter(
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self.session['fernet_keys'],
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mobile=mobile,
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config=self.config)
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full_query = gen_query(
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self.query,
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self.request_params,
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self.config,
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content_filter.near)
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get_body = g.user_request.send(query=full_query)
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# Produce cleanable html soup from response
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html_soup = bsoup(content_filter.reskin(get_body.text), 'html.parser')
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html_soup.insert(
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0,
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bsoup(TOR_BANNER, 'html.parser')
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if g.user_request.tor_valid else bsoup('', 'html.parser'))
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if self.feeling_lucky:
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return get_first_link(html_soup), 0
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else:
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formatted_results = content_filter.clean(html_soup)
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# Append user config to all search links, if available
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param_str = ''.join('&{}={}'.format(k, v)
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for k, v in
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self.request_params.to_dict(flat=True).items()
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if self.config.is_safe_key(k))
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for link in formatted_results.find_all('a', href=True):
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if 'search?' not in link['href'] or link['href'].index(
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'search?') > 1:
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continue
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link['href'] += param_str
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return formatted_results, content_filter.elements
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