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388 lines
18 KiB
388 lines
18 KiB
# HTML to TEXT/JSON DIFFERENCE FETCHER
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import hashlib
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import json
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import logging
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import os
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import re
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import urllib3
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from changedetectionio import content_fetcher, html_tools
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from changedetectionio.blueprint.price_data_follower import PRICE_DATA_TRACK_ACCEPT, PRICE_DATA_TRACK_REJECT
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from copy import deepcopy
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from . import difference_detection_processor
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urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
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name = 'Webpage Text/HTML, JSON and PDF changes'
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description = 'Detects all text changes where possible'
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class FilterNotFoundInResponse(ValueError):
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def __init__(self, msg):
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ValueError.__init__(self, msg)
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class PDFToHTMLToolNotFound(ValueError):
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def __init__(self, msg):
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ValueError.__init__(self, msg)
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# Some common stuff here that can be moved to a base class
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# (set_proxy_from_list)
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class perform_site_check(difference_detection_processor):
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screenshot = None
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xpath_data = None
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def __init__(self, *args, datastore, **kwargs):
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super().__init__(*args, **kwargs)
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self.datastore = datastore
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# Doesn't look like python supports forward slash auto enclosure in re.findall
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# So convert it to inline flag "foobar(?i)" type configuration
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def forward_slash_enclosed_regex_to_options(self, regex):
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res = re.search(r'^/(.*?)/(\w+)$', regex, re.IGNORECASE)
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if res:
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regex = res.group(1)
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regex += '(?{})'.format(res.group(2))
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else:
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regex += '(?{})'.format('i')
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return regex
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def run(self, uuid, skip_when_checksum_same=True):
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changed_detected = False
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screenshot = False # as bytes
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stripped_text_from_html = ""
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# DeepCopy so we can be sure we don't accidently change anything by reference
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watch = deepcopy(self.datastore.data['watching'].get(uuid))
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if not watch:
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raise Exception("Watch no longer exists.")
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# Protect against file:// access
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if re.search(r'^file', watch.get('url', ''), re.IGNORECASE) and not os.getenv('ALLOW_FILE_URI', False):
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raise Exception(
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"file:// type access is denied for security reasons."
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)
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# Unset any existing notification error
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update_obj = {'last_notification_error': False, 'last_error': False}
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extra_headers = watch.get('headers', [])
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# Tweak the base config with the per-watch ones
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request_headers = deepcopy(self.datastore.data['settings']['headers'])
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request_headers.update(extra_headers)
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# https://github.com/psf/requests/issues/4525
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# Requests doesnt yet support brotli encoding, so don't put 'br' here, be totally sure that the user cannot
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# do this by accident.
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if 'Accept-Encoding' in request_headers and "br" in request_headers['Accept-Encoding']:
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request_headers['Accept-Encoding'] = request_headers['Accept-Encoding'].replace(', br', '')
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timeout = self.datastore.data['settings']['requests'].get('timeout')
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url = watch.link
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request_body = self.datastore.data['watching'][uuid].get('body')
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request_method = self.datastore.data['watching'][uuid].get('method')
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ignore_status_codes = self.datastore.data['watching'][uuid].get('ignore_status_codes', False)
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# source: support
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is_source = False
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if url.startswith('source:'):
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url = url.replace('source:', '')
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is_source = True
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# Pluggable content fetcher
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prefer_backend = watch.get_fetch_backend
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if not prefer_backend or prefer_backend == 'system':
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prefer_backend = self.datastore.data['settings']['application']['fetch_backend']
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if hasattr(content_fetcher, prefer_backend):
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klass = getattr(content_fetcher, prefer_backend)
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else:
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# If the klass doesnt exist, just use a default
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klass = getattr(content_fetcher, "html_requests")
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proxy_id = self.datastore.get_preferred_proxy_for_watch(uuid=uuid)
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proxy_url = None
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if proxy_id:
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proxy_url = self.datastore.proxy_list.get(proxy_id).get('url')
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print("UUID {} Using proxy {}".format(uuid, proxy_url))
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fetcher = klass(proxy_override=proxy_url)
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# Configurable per-watch or global extra delay before extracting text (for webDriver types)
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system_webdriver_delay = self.datastore.data['settings']['application'].get('webdriver_delay', None)
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if watch['webdriver_delay'] is not None:
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fetcher.render_extract_delay = watch.get('webdriver_delay')
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elif system_webdriver_delay is not None:
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fetcher.render_extract_delay = system_webdriver_delay
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# Possible conflict
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if prefer_backend == 'html_webdriver':
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fetcher.browser_steps = watch.get('browser_steps', None)
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fetcher.browser_steps_screenshot_path = os.path.join(self.datastore.datastore_path, uuid)
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if watch.get('webdriver_js_execute_code') is not None and watch.get('webdriver_js_execute_code').strip():
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fetcher.webdriver_js_execute_code = watch.get('webdriver_js_execute_code')
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# requests for PDF's, images etc should be passwd the is_binary flag
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is_binary = watch.is_pdf
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fetcher.run(url, timeout, request_headers, request_body, request_method, ignore_status_codes, watch.get('include_filters'), is_binary=is_binary)
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fetcher.quit()
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self.screenshot = fetcher.screenshot
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self.xpath_data = fetcher.xpath_data
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# Track the content type
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update_obj['content_type'] = fetcher.headers.get('Content-Type', '')
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# Watches added automatically in the queue manager will skip if its the same checksum as the previous run
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# Saves a lot of CPU
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update_obj['previous_md5_before_filters'] = hashlib.md5(fetcher.content.encode('utf-8')).hexdigest()
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if skip_when_checksum_same:
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if update_obj['previous_md5_before_filters'] == watch.get('previous_md5_before_filters'):
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raise content_fetcher.checksumFromPreviousCheckWasTheSame()
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# Fetching complete, now filters
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# @todo move to class / maybe inside of fetcher abstract base?
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# @note: I feel like the following should be in a more obvious chain system
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# - Check filter text
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# - Is the checksum different?
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# - Do we convert to JSON?
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# https://stackoverflow.com/questions/41817578/basic-method-chaining ?
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# return content().textfilter().jsonextract().checksumcompare() ?
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is_json = 'application/json' in fetcher.headers.get('Content-Type', '')
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is_html = not is_json
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# source: support, basically treat it as plaintext
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if is_source:
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is_html = False
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is_json = False
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if watch.is_pdf or 'application/pdf' in fetcher.headers.get('Content-Type', '').lower():
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from shutil import which
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tool = os.getenv("PDF_TO_HTML_TOOL", "pdftohtml")
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if not which(tool):
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raise PDFToHTMLToolNotFound("Command-line `{}` tool was not found in system PATH, was it installed?".format(tool))
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import subprocess
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proc = subprocess.Popen(
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[tool, '-stdout', '-', '-s', 'out.pdf', '-i'],
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stdout=subprocess.PIPE,
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stdin=subprocess.PIPE)
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proc.stdin.write(fetcher.raw_content)
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proc.stdin.close()
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fetcher.content = proc.stdout.read().decode('utf-8')
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proc.wait(timeout=60)
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# Add a little metadata so we know if the file changes (like if an image changes, but the text is the same
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# @todo may cause problems with non-UTF8?
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metadata = "<p>Added by changedetection.io: Document checksum - {} Filesize - {} bytes</p>".format(
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hashlib.md5(fetcher.raw_content).hexdigest().upper(),
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len(fetcher.content))
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fetcher.content = fetcher.content.replace('</body>', metadata + '</body>')
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include_filters_rule = deepcopy(watch.get('include_filters', []))
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# include_filters_rule = watch['include_filters']
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subtractive_selectors = watch.get(
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"subtractive_selectors", []
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) + self.datastore.data["settings"]["application"].get(
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"global_subtractive_selectors", []
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)
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# Inject a virtual LD+JSON price tracker rule
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if watch.get('track_ldjson_price_data', '') == PRICE_DATA_TRACK_ACCEPT:
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include_filters_rule.append(html_tools.LD_JSON_PRODUCT_OFFER_SELECTOR)
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has_filter_rule = include_filters_rule and len("".join(include_filters_rule).strip())
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has_subtractive_selectors = subtractive_selectors and len(subtractive_selectors[0].strip())
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if is_json and not has_filter_rule:
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include_filters_rule.append("json:$")
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has_filter_rule = True
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if is_json:
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# Sort the JSON so we dont get false alerts when the content is just re-ordered
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try:
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fetcher.content = json.dumps(json.loads(fetcher.content), sort_keys=True)
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except Exception as e:
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# Might have just been a snippet, or otherwise bad JSON, continue
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pass
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if has_filter_rule:
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json_filter_prefixes = ['json:', 'jq:']
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for filter in include_filters_rule:
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if any(prefix in filter for prefix in json_filter_prefixes):
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stripped_text_from_html += html_tools.extract_json_as_string(content=fetcher.content, json_filter=filter)
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is_html = False
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if is_html or is_source:
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# CSS Filter, extract the HTML that matches and feed that into the existing inscriptis::get_text
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fetcher.content = html_tools.workarounds_for_obfuscations(fetcher.content)
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html_content = fetcher.content
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# If not JSON, and if it's not text/plain..
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if 'text/plain' in fetcher.headers.get('Content-Type', '').lower():
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# Don't run get_text or xpath/css filters on plaintext
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stripped_text_from_html = html_content
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else:
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# Does it have some ld+json price data? used for easier monitoring
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update_obj['has_ldjson_price_data'] = html_tools.has_ldjson_product_info(fetcher.content)
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# Then we assume HTML
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if has_filter_rule:
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html_content = ""
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for filter_rule in include_filters_rule:
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# For HTML/XML we offer xpath as an option, just start a regular xPath "/.."
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if filter_rule[0] == '/' or filter_rule.startswith('xpath:'):
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html_content += html_tools.xpath_filter(xpath_filter=filter_rule.replace('xpath:', ''),
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html_content=fetcher.content,
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append_pretty_line_formatting=not is_source)
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else:
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# CSS Filter, extract the HTML that matches and feed that into the existing inscriptis::get_text
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html_content += html_tools.include_filters(include_filters=filter_rule,
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html_content=fetcher.content,
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append_pretty_line_formatting=not is_source)
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if not html_content.strip():
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raise FilterNotFoundInResponse(include_filters_rule)
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if has_subtractive_selectors:
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html_content = html_tools.element_removal(subtractive_selectors, html_content)
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if is_source:
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stripped_text_from_html = html_content
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else:
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# extract text
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do_anchor = self.datastore.data["settings"]["application"].get("render_anchor_tag_content", False)
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stripped_text_from_html = \
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html_tools.html_to_text(
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html_content,
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render_anchor_tag_content=do_anchor
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)
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# Re #340 - return the content before the 'ignore text' was applied
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text_content_before_ignored_filter = stripped_text_from_html.encode('utf-8')
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# Treat pages with no renderable text content as a change? No by default
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empty_pages_are_a_change = self.datastore.data['settings']['application'].get('empty_pages_are_a_change', False)
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if not is_json and not empty_pages_are_a_change and len(stripped_text_from_html.strip()) == 0:
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raise content_fetcher.ReplyWithContentButNoText(url=url, status_code=fetcher.get_last_status_code(), screenshot=screenshot)
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# We rely on the actual text in the html output.. many sites have random script vars etc,
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# in the future we'll implement other mechanisms.
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update_obj["last_check_status"] = fetcher.get_last_status_code()
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# If there's text to skip
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# @todo we could abstract out the get_text() to handle this cleaner
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text_to_ignore = watch.get('ignore_text', []) + self.datastore.data['settings']['application'].get('global_ignore_text', [])
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if len(text_to_ignore):
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stripped_text_from_html = html_tools.strip_ignore_text(stripped_text_from_html, text_to_ignore)
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else:
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stripped_text_from_html = stripped_text_from_html.encode('utf8')
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# 615 Extract text by regex
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extract_text = watch.get('extract_text', [])
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if len(extract_text) > 0:
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regex_matched_output = []
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for s_re in extract_text:
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# incase they specified something in '/.../x'
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regex = self.forward_slash_enclosed_regex_to_options(s_re)
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result = re.findall(regex.encode('utf-8'), stripped_text_from_html)
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for l in result:
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if type(l) is tuple:
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# @todo - some formatter option default (between groups)
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regex_matched_output += list(l) + [b'\n']
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else:
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# @todo - some formatter option default (between each ungrouped result)
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regex_matched_output += [l] + [b'\n']
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# Now we will only show what the regex matched
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stripped_text_from_html = b''
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text_content_before_ignored_filter = b''
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if regex_matched_output:
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# @todo some formatter for presentation?
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stripped_text_from_html = b''.join(regex_matched_output)
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text_content_before_ignored_filter = stripped_text_from_html
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# Re #133 - if we should strip whitespaces from triggering the change detected comparison
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if self.datastore.data['settings']['application'].get('ignore_whitespace', False):
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fetched_md5 = hashlib.md5(stripped_text_from_html.translate(None, b'\r\n\t ')).hexdigest()
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else:
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fetched_md5 = hashlib.md5(stripped_text_from_html).hexdigest()
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############ Blocking rules, after checksum #################
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blocked = False
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trigger_text = watch.get('trigger_text', [])
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if len(trigger_text):
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# Assume blocked
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blocked = True
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# Filter and trigger works the same, so reuse it
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# It should return the line numbers that match
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result = html_tools.strip_ignore_text(content=str(stripped_text_from_html),
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wordlist=trigger_text,
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mode="line numbers")
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# Unblock if the trigger was found
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if result:
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blocked = False
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text_should_not_be_present = watch.get('text_should_not_be_present', [])
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if len(text_should_not_be_present):
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# If anything matched, then we should block a change from happening
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result = html_tools.strip_ignore_text(content=str(stripped_text_from_html),
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wordlist=text_should_not_be_present,
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mode="line numbers")
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if result:
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blocked = True
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# The main thing that all this at the moment comes down to :)
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if watch.get('previous_md5') != fetched_md5:
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changed_detected = True
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# Looks like something changed, but did it match all the rules?
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if blocked:
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changed_detected = False
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# Extract title as title
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if is_html:
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if self.datastore.data['settings']['application'].get('extract_title_as_title') or watch['extract_title_as_title']:
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if not watch['title'] or not len(watch['title']):
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update_obj['title'] = html_tools.extract_element(find='title', html_content=fetcher.content)
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if changed_detected:
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if watch.get('check_unique_lines', False):
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has_unique_lines = watch.lines_contain_something_unique_compared_to_history(lines=stripped_text_from_html.splitlines())
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# One or more lines? unsure?
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if not has_unique_lines:
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logging.debug("check_unique_lines: UUID {} didnt have anything new setting change_detected=False".format(uuid))
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changed_detected = False
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else:
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logging.debug("check_unique_lines: UUID {} had unique content".format(uuid))
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# Always record the new checksum
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update_obj["previous_md5"] = fetched_md5
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# On the first run of a site, watch['previous_md5'] will be None, set it the current one.
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if not watch.get('previous_md5'):
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watch['previous_md5'] = fetched_md5
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return changed_detected, update_obj, text_content_before_ignored_filter
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