mirror of
https://github.com/searxng/searxng.git
synced 2024-12-11 20:06:28 +00:00
525 lines
15 KiB
Python
525 lines
15 KiB
Python
# -*- coding: utf-8 -*-
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import sys
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import re
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import importlib
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from numbers import Number
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from os.path import splitext, join
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from random import choice
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from html.parser import HTMLParser
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from urllib.parse import urljoin, urlparse, unquote
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from lxml import html
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from lxml.etree import XPath, _ElementStringResult, _ElementUnicodeResult
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from babel.core import get_global
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from searx import settings
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from searx.data import USER_AGENTS
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from searx.version import VERSION_STRING
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from searx.languages import language_codes
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from searx import logger
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logger = logger.getChild('utils')
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blocked_tags = ('script',
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'style')
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ecma_unescape4_re = re.compile(r'%u([0-9a-fA-F]{4})', re.UNICODE)
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ecma_unescape2_re = re.compile(r'%([0-9a-fA-F]{2})', re.UNICODE)
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xpath_cache = dict()
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lang_to_lc_cache = dict()
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def searx_useragent():
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"""Return the searx User Agent"""
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return 'searx/{searx_version} {suffix}'.format(
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searx_version=VERSION_STRING,
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suffix=settings['outgoing'].get('useragent_suffix', ''))
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def gen_useragent(os=None):
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"""Return a random browser User Agent
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See searx/data/useragents.json
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"""
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return str(USER_AGENTS['ua'].format(os=os or choice(USER_AGENTS['os']), version=choice(USER_AGENTS['versions'])))
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class HTMLTextExtractorException(Exception):
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pass
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class HTMLTextExtractor(HTMLParser):
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def __init__(self):
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HTMLParser.__init__(self)
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self.result = []
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self.tags = []
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def handle_starttag(self, tag, attrs):
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self.tags.append(tag)
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def handle_endtag(self, tag):
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if not self.tags:
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return
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if tag != self.tags[-1]:
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raise HTMLTextExtractorException()
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self.tags.pop()
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def is_valid_tag(self):
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return not self.tags or self.tags[-1] not in blocked_tags
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def handle_data(self, d):
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if not self.is_valid_tag():
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return
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self.result.append(d)
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def handle_charref(self, number):
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if not self.is_valid_tag():
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return
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if number[0] in ('x', 'X'):
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codepoint = int(number[1:], 16)
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else:
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codepoint = int(number)
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self.result.append(chr(codepoint))
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def handle_entityref(self, name):
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if not self.is_valid_tag():
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return
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# codepoint = htmlentitydefs.name2codepoint[name]
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# self.result.append(chr(codepoint))
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self.result.append(name)
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def get_text(self):
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return ''.join(self.result).strip()
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def html_to_text(html_str):
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"""Extract text from a HTML string
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Args:
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* html_str (str): string HTML
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Returns:
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* str: extracted text
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Examples:
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>>> html_to_text('Example <span id="42">#2</span>')
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'Example #2'
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>>> html_to_text('<style>.span { color: red; }</style><span>Example</span>')
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'Example'
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"""
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html_str = html_str.replace('\n', ' ')
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html_str = ' '.join(html_str.split())
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s = HTMLTextExtractor()
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try:
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s.feed(html_str)
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except HTMLTextExtractorException:
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logger.debug("HTMLTextExtractor: invalid HTML\n%s", html_str)
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return s.get_text()
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def extract_text(xpath_results):
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"""Extract text from a lxml result
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* if xpath_results is list, extract the text from each result and concat the list
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* if xpath_results is a xml element, extract all the text node from it
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( text_content() method from lxml )
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* if xpath_results is a string element, then it's already done
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"""
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if type(xpath_results) == list:
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# it's list of result : concat everything using recursive call
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result = ''
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for e in xpath_results:
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result = result + extract_text(e)
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return result.strip()
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elif type(xpath_results) in [_ElementStringResult, _ElementUnicodeResult]:
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# it's a string
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return ''.join(xpath_results)
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else:
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# it's a element
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text = html.tostring(
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xpath_results, encoding='unicode', method='text', with_tail=False
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)
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text = text.strip().replace('\n', ' ')
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return ' '.join(text.split())
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def normalize_url(url, base_url):
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"""Normalize URL: add protocol, join URL with base_url, add trailing slash if there is no path
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Args:
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* url (str): Relative URL
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* base_url (str): Base URL, it must be an absolute URL.
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Example:
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>>> normalize_url('https://example.com', 'http://example.com/')
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'https://example.com/'
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>>> normalize_url('//example.com', 'http://example.com/')
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'http://example.com/'
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>>> normalize_url('//example.com', 'https://example.com/')
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'https://example.com/'
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>>> normalize_url('/path?a=1', 'https://example.com')
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'https://example.com/path?a=1'
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>>> normalize_url('', 'https://example.com')
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'https://example.com/'
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>>> normalize_url('/test', '/path')
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raise Exception
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Raises:
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* lxml.etree.ParserError
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Returns:
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* str: normalized URL
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"""
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if url.startswith('//'):
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# add http or https to this kind of url //example.com/
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parsed_search_url = urlparse(base_url)
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url = '{0}:{1}'.format(parsed_search_url.scheme or 'http', url)
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elif url.startswith('/'):
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# fix relative url to the search engine
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url = urljoin(base_url, url)
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# fix relative urls that fall through the crack
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if '://' not in url:
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url = urljoin(base_url, url)
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parsed_url = urlparse(url)
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# add a / at this end of the url if there is no path
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if not parsed_url.netloc:
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raise Exception('Cannot parse url')
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if not parsed_url.path:
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url += '/'
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return url
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def extract_url(xpath_results, base_url):
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"""Extract and normalize URL from lxml Element
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Args:
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* xpath_results (Union[List[html.HtmlElement], html.HtmlElement]): lxml Element(s)
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* base_url (str): Base URL
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Example:
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>>> def f(s, search_url):
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>>> return searx.utils.extract_url(html.fromstring(s), search_url)
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>>> f('<span id="42">https://example.com</span>', 'http://example.com/')
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'https://example.com/'
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>>> f('https://example.com', 'http://example.com/')
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'https://example.com/'
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>>> f('//example.com', 'http://example.com/')
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'http://example.com/'
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>>> f('//example.com', 'https://example.com/')
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'https://example.com/'
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>>> f('/path?a=1', 'https://example.com')
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'https://example.com/path?a=1'
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>>> f('', 'https://example.com')
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raise lxml.etree.ParserError
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>>> searx.utils.extract_url([], 'https://example.com')
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raise Exception
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Raises:
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* Exception
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* lxml.etree.ParserError
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Returns:
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* str: normalized URL
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"""
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if xpath_results == []:
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raise Exception('Empty url resultset')
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url = extract_text(xpath_results)
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return normalize_url(url, base_url)
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def dict_subset(d, properties):
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"""Extract a subset of a dict
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Examples:
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>>> dict_subset({'A': 'a', 'B': 'b', 'C': 'c'}, ['A', 'C'])
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{'A': 'a', 'C': 'c'}
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>>> >> dict_subset({'A': 'a', 'B': 'b', 'C': 'c'}, ['A', 'D'])
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{'A': 'a'}
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"""
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result = {}
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for k in properties:
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if k in d:
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result[k] = d[k]
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return result
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def list_get(a_list, index, default=None):
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"""Get element in list or default value
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Examples:
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>>> list_get(['A', 'B', 'C'], 0)
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'A'
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>>> list_get(['A', 'B', 'C'], 3)
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None
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>>> list_get(['A', 'B', 'C'], 3, 'default')
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'default'
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>>> list_get(['A', 'B', 'C'], -1)
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'C'
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"""
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if len(a_list) > index:
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return a_list[index]
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else:
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return default
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def get_torrent_size(filesize, filesize_multiplier):
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"""
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Args:
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* filesize (str): size
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* filesize_multiplier (str): TB, GB, .... TiB, GiB...
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Returns:
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* int: number of bytes
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Example:
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>>> get_torrent_size('5', 'GB')
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5368709120
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>>> get_torrent_size('3.14', 'MiB')
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3140000
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"""
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try:
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filesize = float(filesize)
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if filesize_multiplier == 'TB':
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filesize = int(filesize * 1024 * 1024 * 1024 * 1024)
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elif filesize_multiplier == 'GB':
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filesize = int(filesize * 1024 * 1024 * 1024)
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elif filesize_multiplier == 'MB':
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filesize = int(filesize * 1024 * 1024)
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elif filesize_multiplier == 'KB':
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filesize = int(filesize * 1024)
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elif filesize_multiplier == 'TiB':
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filesize = int(filesize * 1000 * 1000 * 1000 * 1000)
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elif filesize_multiplier == 'GiB':
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filesize = int(filesize * 1000 * 1000 * 1000)
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elif filesize_multiplier == 'MiB':
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filesize = int(filesize * 1000 * 1000)
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elif filesize_multiplier == 'KiB':
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filesize = int(filesize * 1000)
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except:
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filesize = None
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return filesize
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def convert_str_to_int(number_str):
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"""Convert number_str to int or 0 if number_str is not a number."""
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if number_str.isdigit():
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return int(number_str)
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else:
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return 0
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def int_or_zero(num):
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"""Convert num to int or 0. num can be either a str or a list.
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If num is a list, the first element is converted to int (or return 0 if the list is empty).
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If num is a str, see convert_str_to_int
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"""
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if isinstance(num, list):
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if len(num) < 1:
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return 0
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num = num[0]
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return convert_str_to_int(num)
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def is_valid_lang(lang):
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"""Return language code and name if lang describe a language.
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Examples:
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>>> is_valid_lang('zz')
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False
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>>> is_valid_lang('uk')
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(True, 'uk', 'ukrainian')
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>>> is_valid_lang(b'uk')
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(True, 'uk', 'ukrainian')
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>>> is_valid_lang('en')
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(True, 'en', 'english')
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>>> searx.utils.is_valid_lang('Español')
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(True, 'es', 'spanish')
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>>> searx.utils.is_valid_lang('Spanish')
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(True, 'es', 'spanish')
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"""
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if isinstance(lang, bytes):
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lang = lang.decode()
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is_abbr = (len(lang) == 2)
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lang = lang.lower()
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if is_abbr:
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for l in language_codes:
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if l[0][:2] == lang:
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return (True, l[0][:2], l[3].lower())
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return False
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else:
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for l in language_codes:
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if l[1].lower() == lang or l[3].lower() == lang:
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return (True, l[0][:2], l[3].lower())
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return False
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def _get_lang_to_lc_dict(lang_list):
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key = str(lang_list)
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value = lang_to_lc_cache.get(key, None)
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if value is None:
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value = dict()
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for lc in lang_list:
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value.setdefault(lc.split('-')[0], lc)
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lang_to_lc_cache[key] = value
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return value
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def _match_language(lang_code, lang_list=[], custom_aliases={}):
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"""auxiliary function to match lang_code in lang_list"""
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# replace language code with a custom alias if necessary
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if lang_code in custom_aliases:
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lang_code = custom_aliases[lang_code]
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if lang_code in lang_list:
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return lang_code
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# try to get the most likely country for this language
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subtags = get_global('likely_subtags').get(lang_code)
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if subtags:
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subtag_parts = subtags.split('_')
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new_code = subtag_parts[0] + '-' + subtag_parts[-1]
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if new_code in custom_aliases:
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new_code = custom_aliases[new_code]
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if new_code in lang_list:
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return new_code
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# try to get the any supported country for this language
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return _get_lang_to_lc_dict(lang_list).get(lang_code, None)
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def match_language(locale_code, lang_list=[], custom_aliases={}, fallback='en-US'):
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"""get the language code from lang_list that best matches locale_code"""
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# try to get language from given locale_code
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language = _match_language(locale_code, lang_list, custom_aliases)
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if language:
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return language
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locale_parts = locale_code.split('-')
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lang_code = locale_parts[0]
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# try to get language using an equivalent country code
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if len(locale_parts) > 1:
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country_alias = get_global('territory_aliases').get(locale_parts[-1])
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if country_alias:
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language = _match_language(lang_code + '-' + country_alias[0], lang_list, custom_aliases)
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if language:
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return language
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# try to get language using an equivalent language code
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alias = get_global('language_aliases').get(lang_code)
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if alias:
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language = _match_language(alias, lang_list, custom_aliases)
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if language:
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return language
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if lang_code != locale_code:
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# try to get language from given language without giving the country
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language = _match_language(lang_code, lang_list, custom_aliases)
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return language or fallback
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def load_module(filename, module_dir):
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modname = splitext(filename)[0]
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if modname in sys.modules:
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del sys.modules[modname]
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filepath = join(module_dir, filename)
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# and https://docs.python.org/3/library/importlib.html#importing-a-source-file-directly
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spec = importlib.util.spec_from_file_location(modname, filepath)
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module = importlib.util.module_from_spec(spec)
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sys.modules[modname] = module
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spec.loader.exec_module(module)
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return module
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def to_string(obj):
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"""Convert obj to its string representation."""
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if isinstance(obj, str):
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return obj
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if isinstance(obj, Number):
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return str(obj)
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if hasattr(obj, '__str__'):
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return obj.__str__()
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if hasattr(obj, '__repr__'):
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return obj.__repr__()
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def ecma_unescape(s):
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"""Python implementation of the unescape javascript function
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https://www.ecma-international.org/ecma-262/6.0/#sec-unescape-string
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https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Objets_globaux/unescape
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Examples:
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>>> ecma_unescape('%u5409')
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'吉'
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>>> ecma_unescape('%20')
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' '
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>>> ecma_unescape('%F3')
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'ó'
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"""
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# "%u5409" becomes "吉"
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s = ecma_unescape4_re.sub(lambda e: chr(int(e.group(1), 16)), s)
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# "%20" becomes " ", "%F3" becomes "ó"
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s = ecma_unescape2_re.sub(lambda e: chr(int(e.group(1), 16)), s)
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return s
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def get_string_replaces_function(replaces):
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rep = {re.escape(k): v for k, v in replaces.items()}
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pattern = re.compile("|".join(rep.keys()))
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def f(text):
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return pattern.sub(lambda m: rep[re.escape(m.group(0))], text)
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return f
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def get_engine_from_settings(name):
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"""Return engine configuration from settings.yml of a given engine name"""
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if 'engines' not in settings:
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return {}
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for engine in settings['engines']:
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if 'name' not in engine:
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continue
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if name == engine['name']:
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return engine
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return {}
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def get_xpath(xpath_str):
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"""Return cached compiled XPath
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There is no thread lock.
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Worst case scenario, xpath_str is compiled more than one time.
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"""
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result = xpath_cache.get(xpath_str, None)
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if result is None:
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result = XPath(xpath_str)
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xpath_cache[xpath_str] = result
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return result
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def eval_xpath(element, xpath_str):
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"""Equivalent of element.xpath(xpath_str) but compile xpath_str once for all."""
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xpath = get_xpath(xpath_str)
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return xpath(element)
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