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229 lines
9.9 KiB
229 lines
9.9 KiB
import hashlib
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import os
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import re
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import time
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import urllib3
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from changedetectionio import content_fetcher, html_tools
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urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
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# Some common stuff here that can be moved to a base class
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class perform_site_check():
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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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# If there was a proxy list enabled, figure out what proxy_args/which proxy to use
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# if watch.proxy use that
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# fetcher.proxy_override = watch.proxy or main config proxy
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# Allows override the proxy on a per-request basis
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# ALWAYS use the first one is nothing selected
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def set_proxy_from_list(self, watch):
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proxy_args = None
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if self.datastore.proxy_list is None:
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return None
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# If its a valid one
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if any([watch['proxy'] in p for p in self.datastore.proxy_list]):
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proxy_args = watch['proxy']
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# not valid (including None), try the system one
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else:
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system_proxy = self.datastore.data['settings']['requests']['proxy']
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# Is not None and exists
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if any([system_proxy in p for p in self.datastore.proxy_list]):
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proxy_args = system_proxy
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# Fallback - Did not resolve anything, use the first available
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if proxy_args is None:
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proxy_args = self.datastore.proxy_list[0][0]
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return proxy_args
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def run(self, uuid):
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timestamp = int(time.time()) # used for storage etc too
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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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watch = self.datastore.data['watching'][uuid]
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# Protect against file:// access
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if re.search(r'^file', watch['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 = self.datastore.get_val(uuid, 'headers')
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# Tweak the base config with the per-watch ones
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request_headers = self.datastore.data['settings']['headers'].copy()
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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']['timeout']
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url = self.datastore.get_val(uuid, 'url')
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request_body = self.datastore.get_val(uuid, 'body')
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request_method = self.datastore.get_val(uuid, 'method')
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ignore_status_code = self.datastore.get_val(uuid, 'ignore_status_codes')
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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['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_args = self.set_proxy_from_list(watch)
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fetcher = klass(proxy_override=proxy_args)
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# Proxy List support
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fetcher.run(url, timeout, request_headers, request_body, request_method, ignore_status_code)
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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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css_filter_rule = watch['css_filter']
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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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has_filter_rule = css_filter_rule and len(css_filter_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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css_filter_rule = "json:$"
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has_filter_rule = True
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if has_filter_rule:
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if 'json:' in css_filter_rule:
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stripped_text_from_html = html_tools.extract_json_as_string(content=fetcher.content, jsonpath_filter=css_filter_rule)
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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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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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# Then we assume HTML
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if has_filter_rule:
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# For HTML/XML we offer xpath as an option, just start a regular xPath "/.."
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if css_filter_rule[0] == '/' or css_filter_rule.startswith('xpath:'):
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html_content = html_tools.xpath_filter(xpath_filter=css_filter_rule.replace('xpath:', ''),
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html_content=fetcher.content)
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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.css_filter(css_filter=css_filter_rule, html_content=fetcher.content)
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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 not is_source:
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# extract text
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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=self.datastore.data["settings"][
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"application"].get(
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"render_anchor_tag_content", False)
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)
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elif is_source:
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stripped_text_from_html = html_content
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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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# 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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# 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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# 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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# 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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update_obj["previous_md5"] = fetched_md5
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blocked_by_not_found_trigger_text = False
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if len(watch['trigger_text']):
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# Yeah, lets block first until something matches
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blocked_by_not_found_trigger_text = True
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# Filter and trigger works the same, so reuse it
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result = html_tools.strip_ignore_text(content=str(stripped_text_from_html),
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wordlist=watch['trigger_text'],
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mode="line numbers")
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if result:
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blocked_by_not_found_trigger_text = False
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if not blocked_by_not_found_trigger_text and watch['previous_md5'] != fetched_md5:
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changed_detected = True
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update_obj["previous_md5"] = fetched_md5
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update_obj["last_changed"] = timestamp
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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']['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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return changed_detected, update_obj, text_content_before_ignored_filter, fetcher.screenshot
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