import os import re from typing import Any from app.filter import Filter, get_first_link from app.request import gen_query from bs4 import BeautifulSoup as bsoup from cryptography.fernet import Fernet, InvalidToken from flask import g TOR_BANNER = '

You are using Tor


' CAPTCHA = 'div class="g-recaptcha"' def needs_https(url: str) -> bool: """Checks if the current instance needs to be upgraded to HTTPS Note that all Heroku instances are available by default over HTTPS, but do not automatically set up a redirect when visited over HTTP. Args: url: The instance url Returns: bool: True/False representing the need to upgrade """ https_only = bool(os.getenv('HTTPS_ONLY', 0)) is_heroku = url.endswith('.herokuapp.com') is_http = url.startswith('http://') return (is_heroku and is_http) or (https_only and is_http) def has_captcha(results: str) -> bool: """Checks to see if the search results are blocked by a captcha Args: results: The search page html as a string Returns: bool: True/False indicating if a captcha element was found """ return CAPTCHA in results class Search: """Search query preprocessor - used before submitting the query or redirecting to another site Attributes: request: the incoming flask request config: the current user config settings session_key: the flask user fernet key """ def __init__(self, request, config, session_key, cookies_disabled=False): method = request.method self.request = request self.request_params = request.args if method == 'GET' else request.form self.user_agent = request.headers.get('User-Agent') self.feeling_lucky = False self.config = config self.session_key = session_key self.query = '' self.cookies_disabled = cookies_disabled self.search_type = self.request_params.get( 'tbm') if 'tbm' in self.request_params else '' def __getitem__(self, name) -> Any: return getattr(self, name) def __setitem__(self, name, value) -> None: return setattr(self, name, value) def __delitem__(self, name) -> None: return delattr(self, name) def __contains__(self, name) -> bool: return hasattr(self, name) def new_search_query(self) -> str: """Parses a plaintext query into a valid string for submission Also decrypts the query string, if encrypted (in the case of paginated results). Returns: str: A valid query string """ q = self.request_params.get('q') if q is None or len(q) == 0: return '' else: # Attempt to decrypt if this is an internal link try: q = Fernet(self.session_key).decrypt(q.encode()).decode() except InvalidToken: pass # Strip leading '! ' for "feeling lucky" queries self.feeling_lucky = q.startswith('! ') self.query = q[2:] if self.feeling_lucky else q return self.query def generate_response(self) -> str: """Generates a response for the user's query Returns: str: A string response to the search query, in the form of a URL or string representation of HTML content. """ mobile = 'Android' in self.user_agent or 'iPhone' in self.user_agent content_filter = Filter(self.session_key, root_url=self.request.url_root, mobile=mobile, config=self.config) full_query = gen_query(self.query, self.request_params, self.config) self.full_query = full_query # force mobile search when view image is true and # the request is not already made by a mobile view_image = ('tbm=isch' in full_query and self.config.view_image and not g.user_request.mobile) get_body = g.user_request.send(query=full_query, force_mobile=view_image) # Produce cleanable html soup from response html_soup = bsoup(get_body.text, 'html.parser') # Replace current soup if view_image is active if view_image: html_soup = content_filter.view_image(html_soup) # Indicate whether or not a Tor connection is active if g.user_request.tor_valid: html_soup.insert(0, bsoup(TOR_BANNER, 'html.parser')) if self.feeling_lucky: return get_first_link(html_soup) else: formatted_results = content_filter.clean(html_soup) # Append user config to all search links, if available param_str = ''.join('&{}={}'.format(k, v) for k, v in self.request_params.to_dict(flat=True).items() if self.config.is_safe_key(k)) for link in formatted_results.find_all('a', href=True): link['rel'] = "nofollow noopener noreferrer" if 'search?' not in link['href'] or link['href'].index( 'search?') > 1: continue link['href'] += param_str return str(formatted_results) def check_kw_ip(self) -> re.Match: """Checks for keywords related to 'my ip' in the query Returns: bool """ return re.search("([^a-z0-9]|^)my *[^a-z0-9] *(ip|internet protocol)" + "($|( *[^a-z0-9] *(((addres|address|adres|" + "adress)|a)? *$)))", self.query.lower())