forked from Ponysearch/Ponysearch
647 lines
22 KiB
Python
647 lines
22 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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# pyright: basic
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"""Utility functions for the engines
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"""
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import re
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import importlib
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import importlib.util
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import types
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from typing import Optional, Union, Any, Set, List, Dict, MutableMapping, Tuple, Callable
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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
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from markdown_it import MarkdownIt
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from lxml import html
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from lxml.etree import ElementBase, XPath, XPathError, XPathSyntaxError, _ElementStringResult, _ElementUnicodeResult
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from searx import settings
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from searx.data import USER_AGENTS, data_dir
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from searx.version import VERSION_TAG
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from searx.sxng_locales import sxng_locales
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from searx.exceptions import SearxXPathSyntaxException, SearxEngineXPathException
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from searx import logger
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logger = logger.getChild('utils')
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XPathSpecType = Union[str, XPath]
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_BLOCKED_TAGS = ('script', '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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_STORAGE_UNIT_VALUE: Dict[str, int] = {
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'TB': 1024 * 1024 * 1024 * 1024,
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'GB': 1024 * 1024 * 1024,
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'MB': 1024 * 1024,
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'TiB': 1000 * 1000 * 1000 * 1000,
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'MiB': 1000 * 1000,
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'KiB': 1000,
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}
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_XPATH_CACHE: Dict[str, XPath] = {}
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_LANG_TO_LC_CACHE: Dict[str, Dict[str, str]] = {}
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_FASTTEXT_MODEL: Optional["fasttext.FastText._FastText"] = None
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"""fasttext model to predict laguage of a search term"""
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SEARCH_LANGUAGE_CODES = frozenset([searxng_locale[0].split('-')[0] for searxng_locale in sxng_locales])
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"""Languages supported by most searxng engines (:py:obj:`searx.sxng_locales.sxng_locales`)."""
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class _NotSetClass: # pylint: disable=too-few-public-methods
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"""Internal class for this module, do not create instance of this class.
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Replace the None value, allow explicitly pass None as a function argument"""
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_NOTSET = _NotSetClass()
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def searx_useragent() -> str:
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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_TAG, suffix=settings['outgoing']['useragent_suffix']
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).strip()
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def gen_useragent(os_string: Optional[str] = None) -> str:
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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 USER_AGENTS['ua'].format(os=os_string or choice(USER_AGENTS['os']), version=choice(USER_AGENTS['versions']))
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class _HTMLTextExtractorException(Exception):
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"""Internal exception raised when the HTML is invalid"""
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class _HTMLTextExtractor(HTMLParser): # pylint: disable=W0223 # (see https://bugs.python.org/issue31844)
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"""Internal class to extract text from HTML"""
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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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if tag == 'br':
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self.result.append(' ')
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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, data):
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if not self.is_valid_tag():
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return
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self.result.append(data)
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def handle_charref(self, name):
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if not self.is_valid_tag():
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return
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if name[0] in ('x', 'X'):
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codepoint = int(name[1:], 16)
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else:
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codepoint = int(name)
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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: str) -> 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', ' ').replace('\r', ' ')
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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 markdown_to_text(markdown_str: str) -> str:
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"""Extract text from a Markdown string
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Args:
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* markdown_str (str): string Markdown
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Returns:
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* str: extracted text
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Examples:
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>>> markdown_to_text('[example](https://example.com)')
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'example'
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>>> markdown_to_text('## Headline')
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'Headline'
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"""
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html_str = (
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MarkdownIt("commonmark", {"typographer": True}).enable(["replacements", "smartquotes"]).render(markdown_str)
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)
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return html_to_text(html_str)
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def extract_text(xpath_results, allow_none: bool = False) -> Optional[str]:
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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 isinstance(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) or '')
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return result.strip()
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if isinstance(xpath_results, ElementBase):
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# it's a element
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text: str = html.tostring(xpath_results, encoding='unicode', method='text', with_tail=False)
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text = text.strip().replace('\n', ' ')
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return ' '.join(text.split())
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if isinstance(xpath_results, (_ElementStringResult, _ElementUnicodeResult, str, Number, bool)):
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return str(xpath_results)
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if xpath_results is None and allow_none:
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return None
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if xpath_results is None and not allow_none:
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raise ValueError('extract_text(None, allow_none=False)')
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raise ValueError('unsupported type')
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def normalize_url(url: str, base_url: str) -> str:
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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 ValueError
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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 ValueError('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) -> str:
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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 ValueError
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Raises:
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* ValueError
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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 ValueError('Empty url resultset')
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url = extract_text(xpath_results)
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if url:
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return normalize_url(url, base_url)
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raise ValueError('URL not found')
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def dict_subset(dictionary: MutableMapping, properties: Set[str]) -> Dict:
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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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return {k: dictionary[k] for k in properties if k in dictionary}
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def get_torrent_size(filesize: str, filesize_multiplier: str) -> Optional[int]:
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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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multiplier = _STORAGE_UNIT_VALUE.get(filesize_multiplier, 1)
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return int(float(filesize) * multiplier)
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except ValueError:
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return None
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def convert_str_to_int(number_str: str) -> int:
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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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return 0
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def int_or_zero(num: Union[List[str], str]) -> int:
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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) -> Optional[Tuple[bool, str, str]]:
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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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None
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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 sxng_locales:
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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 None
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for l in sxng_locales:
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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 None
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def load_module(filename: str, module_dir: str) -> types.ModuleType:
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modname = splitext(filename)[0]
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modpath = 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, modpath)
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if not spec:
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raise ValueError(f"Error loading '{modpath}' module")
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module = importlib.util.module_from_spec(spec)
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if not spec.loader:
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raise ValueError(f"Error loading '{modpath}' module")
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spec.loader.exec_module(module)
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return module
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def to_string(obj: Any) -> str:
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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 hasattr(obj, '__str__'):
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return str(obj)
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return repr(obj)
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def ecma_unescape(string: str) -> str:
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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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string = _ECMA_UNESCAPE4_RE.sub(lambda e: chr(int(e.group(1), 16)), string)
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# "%20" becomes " ", "%F3" becomes "ó"
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string = _ECMA_UNESCAPE2_RE.sub(lambda e: chr(int(e.group(1), 16)), string)
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return string
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def get_string_replaces_function(replaces: Dict[str, str]) -> Callable[[str], str]:
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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 func(text):
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return pattern.sub(lambda m: rep[re.escape(m.group(0))], text)
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return func
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def get_engine_from_settings(name: str) -> Dict:
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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_spec: XPathSpecType) -> XPath:
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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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Args:
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* xpath_spec (str|lxml.etree.XPath): XPath as a str or lxml.etree.XPath
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Returns:
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* result (bool, float, list, str): Results.
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Raises:
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* TypeError: Raise when xpath_spec is neither a str nor a lxml.etree.XPath
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* SearxXPathSyntaxException: Raise when there is a syntax error in the XPath
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"""
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if isinstance(xpath_spec, str):
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result = _XPATH_CACHE.get(xpath_spec, None)
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if result is None:
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try:
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result = XPath(xpath_spec)
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except XPathSyntaxError as e:
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raise SearxXPathSyntaxException(xpath_spec, str(e.msg)) from e
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_XPATH_CACHE[xpath_spec] = result
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return result
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if isinstance(xpath_spec, XPath):
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return xpath_spec
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raise TypeError('xpath_spec must be either a str or a lxml.etree.XPath')
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def eval_xpath(element: ElementBase, xpath_spec: XPathSpecType):
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"""Equivalent of element.xpath(xpath_str) but compile xpath_str once for all.
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See https://lxml.de/xpathxslt.html#xpath-return-values
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Args:
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* element (ElementBase): [description]
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* xpath_spec (str|lxml.etree.XPath): XPath as a str or lxml.etree.XPath
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Returns:
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* result (bool, float, list, str): Results.
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Raises:
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* TypeError: Raise when xpath_spec is neither a str nor a lxml.etree.XPath
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* SearxXPathSyntaxException: Raise when there is a syntax error in the XPath
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* SearxEngineXPathException: Raise when the XPath can't be evaluated.
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"""
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xpath = get_xpath(xpath_spec)
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try:
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return xpath(element)
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except XPathError as e:
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arg = ' '.join([str(i) for i in e.args])
|
|
raise SearxEngineXPathException(xpath_spec, arg) from e
|
|
|
|
|
|
def eval_xpath_list(element: ElementBase, xpath_spec: XPathSpecType, min_len: Optional[int] = None):
|
|
"""Same as eval_xpath, check if the result is a list
|
|
|
|
Args:
|
|
* element (ElementBase): [description]
|
|
* xpath_spec (str|lxml.etree.XPath): XPath as a str or lxml.etree.XPath
|
|
* min_len (int, optional): [description]. Defaults to None.
|
|
|
|
Raises:
|
|
* TypeError: Raise when xpath_spec is neither a str nor a lxml.etree.XPath
|
|
* SearxXPathSyntaxException: Raise when there is a syntax error in the XPath
|
|
* SearxEngineXPathException: raise if the result is not a list
|
|
|
|
Returns:
|
|
* result (bool, float, list, str): Results.
|
|
"""
|
|
result = eval_xpath(element, xpath_spec)
|
|
if not isinstance(result, list):
|
|
raise SearxEngineXPathException(xpath_spec, 'the result is not a list')
|
|
if min_len is not None and min_len > len(result):
|
|
raise SearxEngineXPathException(xpath_spec, 'len(xpath_str) < ' + str(min_len))
|
|
return result
|
|
|
|
|
|
def eval_xpath_getindex(elements: ElementBase, xpath_spec: XPathSpecType, index: int, default=_NOTSET):
|
|
"""Call eval_xpath_list then get one element using the index parameter.
|
|
If the index does not exist, either aise an exception is default is not set,
|
|
other return the default value (can be None).
|
|
|
|
Args:
|
|
* elements (ElementBase): lxml element to apply the xpath.
|
|
* xpath_spec (str|lxml.etree.XPath): XPath as a str or lxml.etree.XPath.
|
|
* index (int): index to get
|
|
* default (Object, optional): Defaults if index doesn't exist.
|
|
|
|
Raises:
|
|
* TypeError: Raise when xpath_spec is neither a str nor a lxml.etree.XPath
|
|
* SearxXPathSyntaxException: Raise when there is a syntax error in the XPath
|
|
* SearxEngineXPathException: if the index is not found. Also see eval_xpath.
|
|
|
|
Returns:
|
|
* result (bool, float, list, str): Results.
|
|
"""
|
|
result = eval_xpath_list(elements, xpath_spec)
|
|
if -len(result) <= index < len(result):
|
|
return result[index]
|
|
if default == _NOTSET:
|
|
# raise an SearxEngineXPathException instead of IndexError
|
|
# to record xpath_spec
|
|
raise SearxEngineXPathException(xpath_spec, 'index ' + str(index) + ' not found')
|
|
return default
|
|
|
|
|
|
def _get_fasttext_model() -> "fasttext.FastText._FastText":
|
|
global _FASTTEXT_MODEL # pylint: disable=global-statement
|
|
if _FASTTEXT_MODEL is None:
|
|
import fasttext # pylint: disable=import-outside-toplevel
|
|
|
|
# Monkey patch: prevent fasttext from showing a (useless) warning when loading a model.
|
|
fasttext.FastText.eprint = lambda x: None
|
|
_FASTTEXT_MODEL = fasttext.load_model(str(data_dir / 'lid.176.ftz'))
|
|
return _FASTTEXT_MODEL
|
|
|
|
|
|
def detect_language(text: str, threshold: float = 0.3, only_search_languages: bool = False) -> Optional[str]:
|
|
"""Detect the language of the ``text`` parameter.
|
|
|
|
:param str text: The string whose language is to be detected.
|
|
|
|
:param float threshold: Threshold filters the returned labels by a threshold
|
|
on probability. A choice of 0.3 will return labels with at least 0.3
|
|
probability.
|
|
|
|
:param bool only_search_languages: If ``True``, returns only supported
|
|
SearXNG search languages. see :py:obj:`searx.languages`
|
|
|
|
:rtype: str, None
|
|
:returns:
|
|
The detected language code or ``None``. See below.
|
|
|
|
:raises ValueError: If ``text`` is not a string.
|
|
|
|
The language detection is done by using `a fork`_ of the fastText_ library
|
|
(`python fasttext`_). fastText_ distributes the `language identification
|
|
model`_, for reference:
|
|
|
|
- `FastText.zip: Compressing text classification models`_
|
|
- `Bag of Tricks for Efficient Text Classification`_
|
|
|
|
The `language identification model`_ support the language codes
|
|
(ISO-639-3)::
|
|
|
|
af als am an ar arz as ast av az azb ba bar bcl be bg bh bn bo bpy br bs
|
|
bxr ca cbk ce ceb ckb co cs cv cy da de diq dsb dty dv el eml en eo es
|
|
et eu fa fi fr frr fy ga gd gl gn gom gu gv he hi hif hr hsb ht hu hy ia
|
|
id ie ilo io is it ja jbo jv ka kk km kn ko krc ku kv kw ky la lb lez li
|
|
lmo lo lrc lt lv mai mg mhr min mk ml mn mr mrj ms mt mwl my myv mzn nah
|
|
nap nds ne new nl nn no oc or os pa pam pfl pl pms pnb ps pt qu rm ro ru
|
|
rue sa sah sc scn sco sd sh si sk sl so sq sr su sv sw ta te tg th tk tl
|
|
tr tt tyv ug uk ur uz vec vep vi vls vo wa war wuu xal xmf yi yo yue zh
|
|
|
|
By using ``only_search_languages=True`` the `language identification model`_
|
|
is harmonized with the SearXNG's language (locale) model. General
|
|
conditions of SearXNG's locale model are:
|
|
|
|
a. SearXNG's locale of a query is passed to the
|
|
:py:obj:`searx.locales.get_engine_locale` to get a language and/or region
|
|
code that is used by an engine.
|
|
|
|
b. Most of SearXNG's engines do not support all the languages from `language
|
|
identification model`_ and there is also a discrepancy in the ISO-639-3
|
|
(fastext) and ISO-639-2 (SearXNG)handling. Further more, in SearXNG the
|
|
locales like ``zh-TH`` (``zh-CN``) are mapped to ``zh_Hant``
|
|
(``zh_Hans``) while the `language identification model`_ reduce both to
|
|
``zh``.
|
|
|
|
.. _a fork: https://github.com/searxng/fasttext-predict
|
|
.. _fastText: https://fasttext.cc/
|
|
.. _python fasttext: https://pypi.org/project/fasttext/
|
|
.. _language identification model: https://fasttext.cc/docs/en/language-identification.html
|
|
.. _Bag of Tricks for Efficient Text Classification: https://arxiv.org/abs/1607.01759
|
|
.. _`FastText.zip: Compressing text classification models`: https://arxiv.org/abs/1612.03651
|
|
|
|
"""
|
|
if not isinstance(text, str):
|
|
raise ValueError('text must a str')
|
|
r = _get_fasttext_model().predict(text.replace('\n', ' '), k=1, threshold=threshold)
|
|
if isinstance(r, tuple) and len(r) == 2 and len(r[0]) > 0 and len(r[1]) > 0:
|
|
language = r[0][0].split('__label__')[1]
|
|
if only_search_languages and language not in SEARCH_LANGUAGE_CODES:
|
|
return None
|
|
return language
|
|
return None
|