You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
298 lines
13 KiB
298 lines
13 KiB
import hashlib
|
|
import logging
|
|
import os
|
|
import re
|
|
import time
|
|
import urllib3
|
|
|
|
from changedetectionio import content_fetcher, html_tools
|
|
|
|
urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
|
|
|
|
|
|
# Some common stuff here that can be moved to a base class
|
|
# (set_proxy_from_list)
|
|
class perform_site_check():
|
|
screenshot = None
|
|
xpath_data = None
|
|
|
|
def __init__(self, *args, datastore, **kwargs):
|
|
super().__init__(*args, **kwargs)
|
|
self.datastore = datastore
|
|
|
|
# Doesn't look like python supports forward slash auto enclosure in re.findall
|
|
# So convert it to inline flag "foobar(?i)" type configuration
|
|
def forward_slash_enclosed_regex_to_options(self, regex):
|
|
res = re.search(r'^/(.*?)/(\w+)$', regex, re.IGNORECASE)
|
|
|
|
if res:
|
|
regex = res.group(1)
|
|
regex += '(?{})'.format(res.group(2))
|
|
else:
|
|
regex += '(?{})'.format('i')
|
|
|
|
return regex
|
|
|
|
|
|
def run(self, uuid):
|
|
changed_detected = False
|
|
screenshot = False # as bytes
|
|
stripped_text_from_html = ""
|
|
|
|
watch = self.datastore.data['watching'].get(uuid)
|
|
if not watch:
|
|
return
|
|
|
|
# Protect against file:// access
|
|
if re.search(r'^file', watch['url'], re.IGNORECASE) and not os.getenv('ALLOW_FILE_URI', False):
|
|
raise Exception(
|
|
"file:// type access is denied for security reasons."
|
|
)
|
|
|
|
# Unset any existing notification error
|
|
update_obj = {'last_notification_error': False, 'last_error': False}
|
|
|
|
extra_headers =self.datastore.data['watching'][uuid].get('headers')
|
|
|
|
# Tweak the base config with the per-watch ones
|
|
request_headers = self.datastore.data['settings']['headers'].copy()
|
|
request_headers.update(extra_headers)
|
|
|
|
# https://github.com/psf/requests/issues/4525
|
|
# Requests doesnt yet support brotli encoding, so don't put 'br' here, be totally sure that the user cannot
|
|
# do this by accident.
|
|
if 'Accept-Encoding' in request_headers and "br" in request_headers['Accept-Encoding']:
|
|
request_headers['Accept-Encoding'] = request_headers['Accept-Encoding'].replace(', br', '')
|
|
|
|
timeout = self.datastore.data['settings']['requests'].get('timeout')
|
|
url = watch.get('url')
|
|
request_body = self.datastore.data['watching'][uuid].get('body')
|
|
request_method = self.datastore.data['watching'][uuid].get('method')
|
|
ignore_status_codes = self.datastore.data['watching'][uuid].get('ignore_status_codes', False)
|
|
|
|
# source: support
|
|
is_source = False
|
|
if url.startswith('source:'):
|
|
url = url.replace('source:', '')
|
|
is_source = True
|
|
|
|
# Pluggable content fetcher
|
|
prefer_backend = watch['fetch_backend']
|
|
if hasattr(content_fetcher, prefer_backend):
|
|
klass = getattr(content_fetcher, prefer_backend)
|
|
else:
|
|
# If the klass doesnt exist, just use a default
|
|
klass = getattr(content_fetcher, "html_requests")
|
|
|
|
proxy_id = self.datastore.get_preferred_proxy_for_watch(uuid=uuid)
|
|
proxy_url = None
|
|
if proxy_id:
|
|
proxy_url = self.datastore.proxy_list.get(proxy_id).get('url')
|
|
print ("UUID {} Using proxy {}".format(uuid, proxy_url))
|
|
|
|
fetcher = klass(proxy_override=proxy_url)
|
|
|
|
# Configurable per-watch or global extra delay before extracting text (for webDriver types)
|
|
system_webdriver_delay = self.datastore.data['settings']['application'].get('webdriver_delay', None)
|
|
if watch['webdriver_delay'] is not None:
|
|
fetcher.render_extract_delay = watch['webdriver_delay']
|
|
elif system_webdriver_delay is not None:
|
|
fetcher.render_extract_delay = system_webdriver_delay
|
|
|
|
if watch['webdriver_js_execute_code'] is not None and watch['webdriver_js_execute_code'].strip():
|
|
fetcher.webdriver_js_execute_code = watch['webdriver_js_execute_code']
|
|
|
|
fetcher.run(url, timeout, request_headers, request_body, request_method, ignore_status_codes, watch['css_filter'])
|
|
fetcher.quit()
|
|
|
|
self.screenshot = fetcher.screenshot
|
|
self.xpath_data = fetcher.xpath_data
|
|
|
|
# Fetching complete, now filters
|
|
# @todo move to class / maybe inside of fetcher abstract base?
|
|
|
|
# @note: I feel like the following should be in a more obvious chain system
|
|
# - Check filter text
|
|
# - Is the checksum different?
|
|
# - Do we convert to JSON?
|
|
# https://stackoverflow.com/questions/41817578/basic-method-chaining ?
|
|
# return content().textfilter().jsonextract().checksumcompare() ?
|
|
|
|
is_json = 'application/json' in fetcher.headers.get('Content-Type', '')
|
|
is_html = not is_json
|
|
|
|
# source: support, basically treat it as plaintext
|
|
if is_source:
|
|
is_html = False
|
|
is_json = False
|
|
|
|
css_filter_rule = watch['css_filter']
|
|
subtractive_selectors = watch.get(
|
|
"subtractive_selectors", []
|
|
) + self.datastore.data["settings"]["application"].get(
|
|
"global_subtractive_selectors", []
|
|
)
|
|
|
|
has_filter_rule = css_filter_rule and len(css_filter_rule.strip())
|
|
has_subtractive_selectors = subtractive_selectors and len(subtractive_selectors[0].strip())
|
|
|
|
if is_json and not has_filter_rule:
|
|
css_filter_rule = "json:$"
|
|
has_filter_rule = True
|
|
|
|
if has_filter_rule:
|
|
json_filter_prefixes = ['json:', 'jq:']
|
|
if any(prefix in css_filter_rule for prefix in json_filter_prefixes):
|
|
stripped_text_from_html = html_tools.extract_json_as_string(content=fetcher.content, json_filter=css_filter_rule)
|
|
is_html = False
|
|
|
|
if is_html or is_source:
|
|
|
|
# CSS Filter, extract the HTML that matches and feed that into the existing inscriptis::get_text
|
|
fetcher.content = html_tools.workarounds_for_obfuscations(fetcher.content)
|
|
html_content = fetcher.content
|
|
|
|
# If not JSON, and if it's not text/plain..
|
|
if 'text/plain' in fetcher.headers.get('Content-Type', '').lower():
|
|
# Don't run get_text or xpath/css filters on plaintext
|
|
stripped_text_from_html = html_content
|
|
else:
|
|
# Then we assume HTML
|
|
if has_filter_rule:
|
|
# For HTML/XML we offer xpath as an option, just start a regular xPath "/.."
|
|
if css_filter_rule[0] == '/' or css_filter_rule.startswith('xpath:'):
|
|
html_content = html_tools.xpath_filter(xpath_filter=css_filter_rule.replace('xpath:', ''),
|
|
html_content=fetcher.content)
|
|
else:
|
|
# CSS Filter, extract the HTML that matches and feed that into the existing inscriptis::get_text
|
|
html_content = html_tools.css_filter(css_filter=css_filter_rule, html_content=fetcher.content)
|
|
|
|
if has_subtractive_selectors:
|
|
html_content = html_tools.element_removal(subtractive_selectors, html_content)
|
|
|
|
if not is_source:
|
|
# extract text
|
|
stripped_text_from_html = \
|
|
html_tools.html_to_text(
|
|
html_content,
|
|
render_anchor_tag_content=self.datastore.data["settings"][
|
|
"application"].get(
|
|
"render_anchor_tag_content", False)
|
|
)
|
|
|
|
elif is_source:
|
|
stripped_text_from_html = html_content
|
|
|
|
# Re #340 - return the content before the 'ignore text' was applied
|
|
text_content_before_ignored_filter = stripped_text_from_html.encode('utf-8')
|
|
|
|
# Re #340 - return the content before the 'ignore text' was applied
|
|
text_content_before_ignored_filter = stripped_text_from_html.encode('utf-8')
|
|
|
|
# Treat pages with no renderable text content as a change? No by default
|
|
empty_pages_are_a_change = self.datastore.data['settings']['application'].get('empty_pages_are_a_change', False)
|
|
if not is_json and not empty_pages_are_a_change and len(stripped_text_from_html.strip()) == 0:
|
|
raise content_fetcher.ReplyWithContentButNoText(url=url, status_code=fetcher.get_last_status_code(), screenshot=screenshot)
|
|
|
|
# We rely on the actual text in the html output.. many sites have random script vars etc,
|
|
# in the future we'll implement other mechanisms.
|
|
|
|
update_obj["last_check_status"] = fetcher.get_last_status_code()
|
|
|
|
# If there's text to skip
|
|
# @todo we could abstract out the get_text() to handle this cleaner
|
|
text_to_ignore = watch.get('ignore_text', []) + self.datastore.data['settings']['application'].get('global_ignore_text', [])
|
|
if len(text_to_ignore):
|
|
stripped_text_from_html = html_tools.strip_ignore_text(stripped_text_from_html, text_to_ignore)
|
|
else:
|
|
stripped_text_from_html = stripped_text_from_html.encode('utf8')
|
|
|
|
# 615 Extract text by regex
|
|
extract_text = watch.get('extract_text', [])
|
|
if len(extract_text) > 0:
|
|
regex_matched_output = []
|
|
for s_re in extract_text:
|
|
# incase they specified something in '/.../x'
|
|
regex = self.forward_slash_enclosed_regex_to_options(s_re)
|
|
result = re.findall(regex.encode('utf-8'), stripped_text_from_html)
|
|
|
|
for l in result:
|
|
if type(l) is tuple:
|
|
#@todo - some formatter option default (between groups)
|
|
regex_matched_output += list(l) + [b'\n']
|
|
else:
|
|
# @todo - some formatter option default (between each ungrouped result)
|
|
regex_matched_output += [l] + [b'\n']
|
|
|
|
# Now we will only show what the regex matched
|
|
stripped_text_from_html = b''
|
|
text_content_before_ignored_filter = b''
|
|
if regex_matched_output:
|
|
# @todo some formatter for presentation?
|
|
stripped_text_from_html = b''.join(regex_matched_output)
|
|
text_content_before_ignored_filter = stripped_text_from_html
|
|
|
|
|
|
# Re #133 - if we should strip whitespaces from triggering the change detected comparison
|
|
if self.datastore.data['settings']['application'].get('ignore_whitespace', False):
|
|
fetched_md5 = hashlib.md5(stripped_text_from_html.translate(None, b'\r\n\t ')).hexdigest()
|
|
else:
|
|
fetched_md5 = hashlib.md5(stripped_text_from_html).hexdigest()
|
|
|
|
############ Blocking rules, after checksum #################
|
|
blocked = False
|
|
|
|
if len(watch['trigger_text']):
|
|
# Assume blocked
|
|
blocked = True
|
|
# Filter and trigger works the same, so reuse it
|
|
# It should return the line numbers that match
|
|
result = html_tools.strip_ignore_text(content=str(stripped_text_from_html),
|
|
wordlist=watch['trigger_text'],
|
|
mode="line numbers")
|
|
# Unblock if the trigger was found
|
|
if result:
|
|
blocked = False
|
|
|
|
|
|
if len(watch['text_should_not_be_present']):
|
|
# If anything matched, then we should block a change from happening
|
|
result = html_tools.strip_ignore_text(content=str(stripped_text_from_html),
|
|
wordlist=watch['text_should_not_be_present'],
|
|
mode="line numbers")
|
|
if result:
|
|
blocked = True
|
|
|
|
# The main thing that all this at the moment comes down to :)
|
|
if watch['previous_md5'] != fetched_md5:
|
|
changed_detected = True
|
|
|
|
# Looks like something changed, but did it match all the rules?
|
|
if blocked:
|
|
changed_detected = False
|
|
|
|
# Extract title as title
|
|
if is_html:
|
|
if self.datastore.data['settings']['application']['extract_title_as_title'] or watch['extract_title_as_title']:
|
|
if not watch['title'] or not len(watch['title']):
|
|
update_obj['title'] = html_tools.extract_element(find='title', html_content=fetcher.content)
|
|
|
|
if changed_detected:
|
|
if watch.get('check_unique_lines', False):
|
|
has_unique_lines = watch.lines_contain_something_unique_compared_to_history(lines=stripped_text_from_html.splitlines())
|
|
# One or more lines? unsure?
|
|
if not has_unique_lines:
|
|
logging.debug("check_unique_lines: UUID {} didnt have anything new setting change_detected=False".format(uuid))
|
|
changed_detected = False
|
|
else:
|
|
logging.debug("check_unique_lines: UUID {} had unique content".format(uuid))
|
|
|
|
# Always record the new checksum
|
|
update_obj["previous_md5"] = fetched_md5
|
|
|
|
# On the first run of a site, watch['previous_md5'] will be None, set it the current one.
|
|
if not watch.get('previous_md5'):
|
|
watch['previous_md5'] = fetched_md5
|
|
|
|
return changed_detected, update_obj, text_content_before_ignored_filter
|