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138 lines
6.5 KiB
138 lines
6.5 KiB
from abc import abstractmethod
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import os
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import hashlib
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import re
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from changedetectionio import content_fetcher
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from copy import deepcopy
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from distutils.util import strtobool
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from loguru import logger
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class difference_detection_processor():
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browser_steps = None
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datastore = None
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fetcher = None
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screenshot = None
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watch = None
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xpath_data = None
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def __init__(self, *args, datastore, watch_uuid, **kwargs):
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super().__init__(*args, **kwargs)
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self.datastore = datastore
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self.watch = deepcopy(self.datastore.data['watching'].get(watch_uuid))
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def call_browser(self):
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# Protect against file:// access
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if re.search(r'^file://', self.watch.get('url', '').strip(), re.IGNORECASE):
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if not strtobool(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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url = self.watch.link
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# Requests, playwright, other browser via wss:// etc, fetch_extra_something
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prefer_fetch_backend = self.watch.get('fetch_backend', 'system')
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# Proxy ID "key"
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preferred_proxy_id = self.datastore.get_preferred_proxy_for_watch(uuid=self.watch.get('uuid'))
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# Pluggable content self.fetcher
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if not prefer_fetch_backend or prefer_fetch_backend == 'system':
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prefer_fetch_backend = self.datastore.data['settings']['application'].get('fetch_backend')
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# In the case that the preferred fetcher was a browser config with custom connection URL..
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# @todo - on save watch, if its extra_browser_ then it should be obvious it will use playwright (like if its requests now..)
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custom_browser_connection_url = None
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if prefer_fetch_backend.startswith('extra_browser_'):
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(t, key) = prefer_fetch_backend.split('extra_browser_')
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connection = list(
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filter(lambda s: (s['browser_name'] == key), self.datastore.data['settings']['requests'].get('extra_browsers', [])))
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if connection:
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prefer_fetch_backend = 'base_html_playwright'
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custom_browser_connection_url = connection[0].get('browser_connection_url')
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# PDF should be html_requests because playwright will serve it up (so far) in a embedded page
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# @todo https://github.com/dgtlmoon/changedetection.io/issues/2019
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# @todo needs test to or a fix
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if self.watch.is_pdf:
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prefer_fetch_backend = "html_requests"
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# Grab the right kind of 'fetcher', (playwright, requests, etc)
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if hasattr(content_fetcher, prefer_fetch_backend):
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fetcher_obj = getattr(content_fetcher, prefer_fetch_backend)
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else:
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# If the klass doesnt exist, just use a default
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fetcher_obj = getattr(content_fetcher, "html_requests")
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proxy_url = None
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if preferred_proxy_id:
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proxy_url = self.datastore.proxy_list.get(preferred_proxy_id).get('url')
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logger.debug(f"Using proxy Key: {preferred_proxy_id} as Proxy URL {proxy_url}")
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# Now call the fetcher (playwright/requests/etc) with arguments that only a fetcher would need.
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# When browser_connection_url is None, it method should default to working out whats the best defaults (os env vars etc)
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self.fetcher = fetcher_obj(proxy_override=proxy_url,
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custom_browser_connection_url=custom_browser_connection_url
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)
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if self.watch.has_browser_steps:
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self.fetcher.browser_steps = self.watch.get('browser_steps', [])
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self.fetcher.browser_steps_screenshot_path = os.path.join(self.datastore.datastore_path, self.watch.get('uuid'))
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# Tweak the base config with the per-watch ones
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request_headers = self.watch.get('headers', [])
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request_headers.update(self.datastore.get_all_base_headers())
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request_headers.update(self.datastore.get_all_headers_in_textfile_for_watch(uuid=self.watch.get('uuid')))
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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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request_body = self.watch.get('body')
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request_method = self.watch.get('method')
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ignore_status_codes = self.watch.get('ignore_status_codes', False)
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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 self.watch.get('webdriver_delay'):
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self.fetcher.render_extract_delay = self.watch.get('webdriver_delay')
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elif system_webdriver_delay is not None:
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self.fetcher.render_extract_delay = system_webdriver_delay
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if self.watch.get('webdriver_js_execute_code') is not None and self.watch.get('webdriver_js_execute_code').strip():
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self.fetcher.webdriver_js_execute_code = self.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 = self.watch.is_pdf
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# And here we go! call the right browser with browser-specific settings
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self.fetcher.run(url, timeout, request_headers, request_body, request_method, ignore_status_codes, self.watch.get('include_filters'),
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is_binary=is_binary)
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#@todo .quit here could go on close object, so we can run JS if change-detected
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self.fetcher.quit()
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# After init, call run_changedetection() which will do the actual change-detection
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@abstractmethod
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def run_changedetection(self, uuid, skip_when_checksum_same=True):
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update_obj = {'last_notification_error': False, 'last_error': False}
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some_data = 'xxxxx'
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update_obj["previous_md5"] = hashlib.md5(some_data.encode('utf-8')).hexdigest()
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changed_detected = False
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return changed_detected, update_obj, ''.encode('utf-8')
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def available_processors():
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from . import restock_diff, text_json_diff
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x=[('text_json_diff', text_json_diff.name), ('restock_diff', restock_diff.name)]
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# @todo Make this smarter with introspection of sorts.
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return x
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