mirror of
https://github.com/dgtlmoon/changedetection.io.git
synced 2025-10-31 14:47:21 +00:00
305 lines
11 KiB
Python
305 lines
11 KiB
Python
|
|
from bs4 import BeautifulSoup
|
|
from inscriptis import get_text
|
|
from inscriptis.model.config import ParserConfig
|
|
from jsonpath_ng.ext import parse
|
|
from typing import List
|
|
import json
|
|
import re
|
|
|
|
# HTML added to be sure each result matching a filter (.example) gets converted to a new line by Inscriptis
|
|
TEXT_FILTER_LIST_LINE_SUFFIX = "<br>"
|
|
|
|
# 'price' , 'lowPrice', 'highPrice' are usually under here
|
|
# all of those may or may not appear on different websites
|
|
LD_JSON_PRODUCT_OFFER_SELECTOR = "json:$..offers"
|
|
|
|
class JSONNotFound(ValueError):
|
|
def __init__(self, msg):
|
|
ValueError.__init__(self, msg)
|
|
|
|
# Given a CSS Rule, and a blob of HTML, return the blob of HTML that matches
|
|
def include_filters(include_filters, html_content, append_pretty_line_formatting=False):
|
|
soup = BeautifulSoup(html_content, "html.parser")
|
|
html_block = ""
|
|
r = soup.select(include_filters, separator="")
|
|
|
|
for element in r:
|
|
# When there's more than 1 match, then add the suffix to separate each line
|
|
# And where the matched result doesn't include something that will cause Inscriptis to add a newline
|
|
# (This way each 'match' reliably has a new-line in the diff)
|
|
# Divs are converted to 4 whitespaces by inscriptis
|
|
if append_pretty_line_formatting and len(html_block) and not element.name in (['br', 'hr', 'div', 'p']):
|
|
html_block += TEXT_FILTER_LIST_LINE_SUFFIX
|
|
|
|
html_block += str(element)
|
|
|
|
return html_block
|
|
|
|
def subtractive_css_selector(css_selector, html_content):
|
|
soup = BeautifulSoup(html_content, "html.parser")
|
|
for item in soup.select(css_selector):
|
|
item.decompose()
|
|
return str(soup)
|
|
|
|
|
|
def element_removal(selectors: List[str], html_content):
|
|
"""Joins individual filters into one css filter."""
|
|
selector = ",".join(selectors)
|
|
return subtractive_css_selector(selector, html_content)
|
|
|
|
|
|
# Return str Utf-8 of matched rules
|
|
def xpath_filter(xpath_filter, html_content, append_pretty_line_formatting=False):
|
|
from lxml import etree, html
|
|
|
|
tree = html.fromstring(bytes(html_content, encoding='utf-8'))
|
|
html_block = ""
|
|
|
|
r = tree.xpath(xpath_filter.strip(), namespaces={'re': 'http://exslt.org/regular-expressions'})
|
|
#@note: //title/text() wont work where <title>CDATA..
|
|
|
|
for element in r:
|
|
# When there's more than 1 match, then add the suffix to separate each line
|
|
# And where the matched result doesn't include something that will cause Inscriptis to add a newline
|
|
# (This way each 'match' reliably has a new-line in the diff)
|
|
# Divs are converted to 4 whitespaces by inscriptis
|
|
if append_pretty_line_formatting and len(html_block) and (not hasattr( element, 'tag' ) or not element.tag in (['br', 'hr', 'div', 'p'])):
|
|
html_block += TEXT_FILTER_LIST_LINE_SUFFIX
|
|
|
|
if type(element) == etree._ElementStringResult:
|
|
html_block += str(element)
|
|
elif type(element) == etree._ElementUnicodeResult:
|
|
html_block += str(element)
|
|
else:
|
|
html_block += etree.tostring(element, pretty_print=True).decode('utf-8')
|
|
|
|
return html_block
|
|
|
|
|
|
# Extract/find element
|
|
def extract_element(find='title', html_content=''):
|
|
|
|
#Re #106, be sure to handle when its not found
|
|
element_text = None
|
|
|
|
soup = BeautifulSoup(html_content, 'html.parser')
|
|
result = soup.find(find)
|
|
if result and result.string:
|
|
element_text = result.string.strip()
|
|
|
|
return element_text
|
|
|
|
#
|
|
def _parse_json(json_data, json_filter):
|
|
if 'json:' in json_filter:
|
|
jsonpath_expression = parse(json_filter.replace('json:', ''))
|
|
match = jsonpath_expression.find(json_data)
|
|
return _get_stripped_text_from_json_match(match)
|
|
|
|
if 'jq:' in json_filter:
|
|
|
|
try:
|
|
import jq
|
|
except ModuleNotFoundError:
|
|
# `jq` requires full compilation in windows and so isn't generally available
|
|
raise Exception("jq not support not found")
|
|
|
|
jq_expression = jq.compile(json_filter.replace('jq:', ''))
|
|
match = jq_expression.input(json_data).all()
|
|
|
|
return _get_stripped_text_from_json_match(match)
|
|
|
|
def _get_stripped_text_from_json_match(match):
|
|
s = []
|
|
# More than one result, we will return it as a JSON list.
|
|
if len(match) > 1:
|
|
for i in match:
|
|
s.append(i.value if hasattr(i, 'value') else i)
|
|
|
|
# Single value, use just the value, as it could be later used in a token in notifications.
|
|
if len(match) == 1:
|
|
s = match[0].value if hasattr(match[0], 'value') else match[0]
|
|
|
|
# Re #257 - Better handling where it does not exist, in the case the original 's' value was False..
|
|
if not match:
|
|
# Re 265 - Just return an empty string when filter not found
|
|
return ''
|
|
|
|
# Ticket #462 - allow the original encoding through, usually it's UTF-8 or similar
|
|
stripped_text_from_html = json.dumps(s, indent=4, ensure_ascii=False)
|
|
|
|
return stripped_text_from_html
|
|
|
|
# content - json
|
|
# json_filter - ie json:$..price
|
|
# ensure_is_ldjson_info_type - str "product", optional, "@type == product" (I dont know how to do that as a json selector)
|
|
def extract_json_as_string(content, json_filter, ensure_is_ldjson_info_type=None):
|
|
stripped_text_from_html = False
|
|
|
|
# Try to parse/filter out the JSON, if we get some parser error, then maybe it's embedded <script type=ldjson>
|
|
try:
|
|
stripped_text_from_html = _parse_json(json.loads(content), json_filter)
|
|
except json.JSONDecodeError:
|
|
|
|
# Foreach <script json></script> blob.. just return the first that matches json_filter
|
|
s = []
|
|
soup = BeautifulSoup(content, 'html.parser')
|
|
|
|
if ensure_is_ldjson_info_type:
|
|
bs_result = soup.findAll('script', {"type": "application/ld+json"})
|
|
else:
|
|
bs_result = soup.findAll('script')
|
|
|
|
|
|
if not bs_result:
|
|
raise JSONNotFound("No parsable JSON found in this document")
|
|
|
|
for result in bs_result:
|
|
# Skip empty tags, and things that dont even look like JSON
|
|
if not result.string or not '{' in result.string:
|
|
continue
|
|
|
|
try:
|
|
json_data = json.loads(result.string)
|
|
except json.JSONDecodeError:
|
|
# Just skip it
|
|
continue
|
|
else:
|
|
stripped_text_from_html = _parse_json(json_data, json_filter)
|
|
if ensure_is_ldjson_info_type:
|
|
# Could sometimes be list, string or something else random
|
|
if isinstance(json_data, dict):
|
|
# If it has LD JSON 'key' @type, and @type is 'product', and something was found for the search
|
|
# (Some sites have multiple of the same ld+json @type='product', but some have the review part, some have the 'price' part)
|
|
if json_data.get('@type', False) and json_data.get('@type','').lower() == ensure_is_ldjson_info_type.lower() and stripped_text_from_html:
|
|
break
|
|
elif stripped_text_from_html:
|
|
break
|
|
|
|
if not stripped_text_from_html:
|
|
# Re 265 - Just return an empty string when filter not found
|
|
return ''
|
|
|
|
return stripped_text_from_html
|
|
|
|
# Mode - "content" return the content without the matches (default)
|
|
# - "line numbers" return a list of line numbers that match (int list)
|
|
#
|
|
# wordlist - list of regex's (str) or words (str)
|
|
def strip_ignore_text(content, wordlist, mode="content"):
|
|
ignore = []
|
|
ignore_regex = []
|
|
|
|
# @todo check this runs case insensitive
|
|
for k in wordlist:
|
|
|
|
# Is it a regex?
|
|
if k[0] == '/':
|
|
ignore_regex.append(k.strip(" /"))
|
|
else:
|
|
ignore.append(k)
|
|
|
|
i = 0
|
|
output = []
|
|
ignored_line_numbers = []
|
|
for line in content.splitlines():
|
|
i += 1
|
|
# Always ignore blank lines in this mode. (when this function gets called)
|
|
if len(line.strip()):
|
|
regex_matches = False
|
|
|
|
# if any of these match, skip
|
|
for regex in ignore_regex:
|
|
try:
|
|
if re.search(regex, line, re.IGNORECASE):
|
|
regex_matches = True
|
|
except Exception as e:
|
|
continue
|
|
|
|
if not regex_matches and not any(skip_text.lower() in line.lower() for skip_text in ignore):
|
|
output.append(line.encode('utf8'))
|
|
else:
|
|
ignored_line_numbers.append(i)
|
|
|
|
|
|
|
|
# Used for finding out what to highlight
|
|
if mode == "line numbers":
|
|
return ignored_line_numbers
|
|
|
|
return "\n".encode('utf8').join(output)
|
|
|
|
|
|
def html_to_text(html_content: str, render_anchor_tag_content=False) -> str:
|
|
"""Converts html string to a string with just the text. If ignoring
|
|
rendering anchor tag content is enable, anchor tag content are also
|
|
included in the text
|
|
|
|
:param html_content: string with html content
|
|
:param render_anchor_tag_content: boolean flag indicating whether to extract
|
|
hyperlinks (the anchor tag content) together with text. This refers to the
|
|
'href' inside 'a' tags.
|
|
Anchor tag content is rendered in the following manner:
|
|
'[ text ](anchor tag content)'
|
|
:return: extracted text from the HTML
|
|
"""
|
|
# if anchor tag content flag is set to True define a config for
|
|
# extracting this content
|
|
if render_anchor_tag_content:
|
|
|
|
parser_config = ParserConfig(
|
|
annotation_rules={"a": ["hyperlink"]}, display_links=True
|
|
)
|
|
|
|
# otherwise set config to None
|
|
else:
|
|
parser_config = None
|
|
|
|
# get text and annotations via inscriptis
|
|
text_content = get_text(html_content, config=parser_config)
|
|
|
|
return text_content
|
|
|
|
|
|
# Does LD+JSON exist with a @type=='product' and a .price set anywhere?
|
|
def has_ldjson_product_info(content):
|
|
try:
|
|
pricing_data = extract_json_as_string(content=content, json_filter=LD_JSON_PRODUCT_OFFER_SELECTOR, ensure_is_ldjson_info_type="product")
|
|
except JSONNotFound as e:
|
|
# Totally fine
|
|
return False
|
|
x=bool(pricing_data)
|
|
return x
|
|
|
|
|
|
def workarounds_for_obfuscations(content):
|
|
"""
|
|
Some sites are using sneaky tactics to make prices and other information un-renderable by Inscriptis
|
|
This could go into its own Pip package in the future, for faster updates
|
|
"""
|
|
|
|
# HomeDepot.com style <span>$<!-- -->90<!-- -->.<!-- -->74</span>
|
|
# https://github.com/weblyzard/inscriptis/issues/45
|
|
if not content:
|
|
return content
|
|
|
|
content = re.sub('<!--\s+-->', '', content)
|
|
|
|
return content
|
|
|
|
|
|
def get_triggered_text(content, trigger_text):
|
|
triggered_text = []
|
|
result = strip_ignore_text(content=content,
|
|
wordlist=trigger_text,
|
|
mode="line numbers")
|
|
|
|
i = 1
|
|
for p in content.splitlines():
|
|
if i in result:
|
|
triggered_text.append(p)
|
|
i += 1
|
|
|
|
return triggered_text
|