from changedetectionio.strtobool import strtobool import os import re import time import uuid from pathlib import Path from loguru import logger # Allowable protocols, protects against javascript: etc # file:// is further checked by ALLOW_FILE_URI SAFE_PROTOCOL_REGEX='^(http|https|ftp|file):' minimum_seconds_recheck_time = int(os.getenv('MINIMUM_SECONDS_RECHECK_TIME', 60)) mtable = {'seconds': 1, 'minutes': 60, 'hours': 3600, 'days': 86400, 'weeks': 86400 * 7} from changedetectionio.notification import ( default_notification_format_for_watch ) base_config = { 'body': None, 'browser_steps': [], 'browser_steps_last_error_step': None, 'check_unique_lines': False, # On change-detected, compare against all history if its something new 'check_count': 0, 'date_created': None, 'consecutive_filter_failures': 0, # Every time the CSS/xPath filter cannot be located, reset when all is fine. 'extract_text': [], # Extract text by regex after filters 'extract_title_as_title': False, 'fetch_backend': 'system', # plaintext, playwright etc 'fetch_time': 0.0, 'processor': 'text_json_diff', # could be restock_diff or others from .processors 'filter_failure_notification_send': strtobool(os.getenv('FILTER_FAILURE_NOTIFICATION_SEND_DEFAULT', 'True')), 'filter_text_added': True, 'filter_text_replaced': True, 'filter_text_removed': True, 'has_ldjson_price_data': None, 'track_ldjson_price_data': None, 'headers': {}, # Extra headers to send 'ignore_text': [], # List of text to ignore when calculating the comparison checksum 'in_stock' : None, 'in_stock_only' : True, # Only trigger change on going to instock from out-of-stock 'include_filters': [], 'last_checked': 0, 'last_error': False, 'last_viewed': 0, # history key value of the last viewed via the [diff] link 'method': 'GET', 'notification_alert_count': 0, # Custom notification content 'notification_body': None, 'notification_format': default_notification_format_for_watch, 'notification_muted': False, 'notification_title': None, 'notification_screenshot': False, # Include the latest screenshot if available and supported by the apprise URL 'notification_urls': [], # List of URLs to add to the notification Queue (Usually AppRise) 'paused': False, 'previous_md5': False, 'previous_md5_before_filters': False, # Used for skipping changedetection entirely 'proxy': None, # Preferred proxy connection 'remote_server_reply': None, # From 'server' reply header 'sort_text_alphabetically': False, 'subtractive_selectors': [], 'tag': '', # Old system of text name for a tag, to be removed 'tags': [], # list of UUIDs to App.Tags 'text_should_not_be_present': [], # Text that should not present # Re #110, so then if this is set to None, we know to use the default value instead # Requires setting to None on submit if it's the same as the default # Should be all None by default, so we use the system default in this case. 'time_between_check': {'weeks': None, 'days': None, 'hours': None, 'minutes': None, 'seconds': None}, 'title': None, 'trigger_text': [], # List of text or regex to wait for until a change is detected 'url': '', 'uuid': str(uuid.uuid4()), 'webdriver_delay': None, 'webdriver_js_execute_code': None, # Run before change-detection } def is_safe_url(test_url): # See https://github.com/dgtlmoon/changedetection.io/issues/1358 # Remove 'source:' prefix so we dont get 'source:javascript:' etc # 'source:' is a valid way to tell us to return the source r = re.compile(re.escape('source:'), re.IGNORECASE) test_url = r.sub('', test_url) pattern = re.compile(os.getenv('SAFE_PROTOCOL_REGEX', SAFE_PROTOCOL_REGEX), re.IGNORECASE) if not pattern.match(test_url.strip()): return False return True class model(dict): __newest_history_key = None __history_n = 0 jitter_seconds = 0 def __init__(self, *arg, **kw): self.update(base_config) self.__datastore_path = kw['datastore_path'] self['uuid'] = str(uuid.uuid4()) del kw['datastore_path'] if kw.get('default'): self.update(kw['default']) del kw['default'] # Be sure the cached timestamp is ready bump = self.history # Goes at the end so we update the default object with the initialiser super(model, self).__init__(*arg, **kw) @property def viewed(self): # Don't return viewed when last_viewed is 0 and newest_key is 0 if int(self['last_viewed']) and int(self['last_viewed']) >= int(self.newest_history_key) : return True return False def ensure_data_dir_exists(self): if not os.path.isdir(self.watch_data_dir): logger.debug(f"> Creating data dir {self.watch_data_dir}") os.mkdir(self.watch_data_dir) @property def link(self): url = self.get('url', '') if not is_safe_url(url): return 'DISABLED' ready_url = url if '{%' in url or '{{' in url: from jinja2 import Environment # Jinja2 available in URLs along with https://pypi.org/project/jinja2-time/ jinja2_env = Environment(extensions=['jinja2_time.TimeExtension']) try: ready_url = str(jinja2_env.from_string(url).render()) except Exception as e: from flask import ( flash, Markup, url_for ) message = Markup('The URL {} is invalid and cannot be used, click to edit'.format( url_for('edit_page', uuid=self.get('uuid')), self.get('url', ''))) flash(message, 'error') return '' if ready_url.startswith('source:'): ready_url=ready_url.replace('source:', '') return ready_url @property def is_source_type_url(self): return self.get('url', '').startswith('source:') @property def get_fetch_backend(self): """ Like just using the `fetch_backend` key but there could be some logic :return: """ # Maybe also if is_image etc? # This is because chrome/playwright wont render the PDF in the browser and we will just fetch it and use pdf2html to see the text. if self.is_pdf: return 'html_requests' return self.get('fetch_backend') @property def is_pdf(self): # content_type field is set in the future # https://github.com/dgtlmoon/changedetection.io/issues/1392 # Not sure the best logic here return self.get('url', '').lower().endswith('.pdf') or 'pdf' in self.get('content_type', '').lower() @property def label(self): # Used for sorting return self.get('title') if self.get('title') else self.get('url') @property def last_changed(self): # last_changed will be the newest snapshot, but when we have just one snapshot, it should be 0 if self.__history_n <= 1: return 0 if self.__newest_history_key: return int(self.__newest_history_key) return 0 @property def history_n(self): return self.__history_n @property def history(self): """History index is just a text file as a list {watch-uuid}/history.txt contains a list like {epoch-time},{filename}\n We read in this list as the history information """ tmp_history = {} # Read the history file as a dict fname = os.path.join(self.watch_data_dir, "history.txt") if os.path.isfile(fname): logger.debug(f"Reading watch history index for {self.get('uuid')}") with open(fname, "r") as f: for i in f.readlines(): if ',' in i: k, v = i.strip().split(',', 2) # The index history could contain a relative path, so we need to make the fullpath # so that python can read it if not '/' in v and not '\'' in v: v = os.path.join(self.watch_data_dir, v) else: # It's possible that they moved the datadir on older versions # So the snapshot exists but is in a different path snapshot_fname = v.split('/')[-1] proposed_new_path = os.path.join(self.watch_data_dir, snapshot_fname) if not os.path.exists(v) and os.path.exists(proposed_new_path): v = proposed_new_path tmp_history[k] = v if len(tmp_history): self.__newest_history_key = list(tmp_history.keys())[-1] self.__history_n = len(tmp_history) return tmp_history @property def has_history(self): fname = os.path.join(self.watch_data_dir, "history.txt") return os.path.isfile(fname) @property def has_browser_steps(self): has_browser_steps = self.get('browser_steps') and list(filter( lambda s: (s['operation'] and len(s['operation']) and s['operation'] != 'Choose one' and s['operation'] != 'Goto site'), self.get('browser_steps'))) return has_browser_steps # Returns the newest key, but if theres only 1 record, then it's counted as not being new, so return 0. @property def newest_history_key(self): if self.__newest_history_key is not None: return self.__newest_history_key if len(self.history) <= 1: return 0 bump = self.history return self.__newest_history_key # Given an arbitrary timestamp, find the closest next key # For example, last_viewed = 1000 so it should return the next 1001 timestamp # # used for the [diff] button so it can preset a smarter from_version @property def get_next_snapshot_key_to_last_viewed(self): """Unfortunately for now timestamp is stored as string key""" keys = list(self.history.keys()) if not keys: return None last_viewed = int(self.get('last_viewed')) prev_k = keys[0] sorted_keys = sorted(keys, key=lambda x: int(x)) sorted_keys.reverse() # When the 'last viewed' timestamp is greater than the newest snapshot, return second last if last_viewed > int(sorted_keys[0]): return sorted_keys[1] for k in sorted_keys: if int(k) < last_viewed: if prev_k == sorted_keys[0]: # Return the second last one so we dont recommend the same version compares itself return sorted_keys[1] return prev_k prev_k = k return keys[0] def get_history_snapshot(self, timestamp): import brotli filepath = self.history[timestamp] # See if a brotli versions exists and switch to that if not filepath.endswith('.br') and os.path.isfile(f"{filepath}.br"): filepath = f"{filepath}.br" # OR in the backup case that the .br does not exist, but the plain one does if filepath.endswith('.br') and not os.path.isfile(filepath): if os.path.isfile(filepath.replace('.br', '')): filepath = filepath.replace('.br', '') if filepath.endswith('.br'): # Brotli doesnt have a fileheader to detect it, so we rely on filename # https://www.rfc-editor.org/rfc/rfc7932 with open(filepath, 'rb') as f: return(brotli.decompress(f.read()).decode('utf-8')) with open(filepath, 'r', encoding='utf-8', errors='ignore') as f: return f.read() # Save some text file to the appropriate path and bump the history # result_obj from fetch_site_status.run() def save_history_text(self, contents, timestamp, snapshot_id): import brotli self.ensure_data_dir_exists() # Small hack so that we sleep just enough to allow 1 second between history snapshots # this is because history.txt indexes/keys snapshots by epoch seconds and we dont want dupe keys if self.__newest_history_key and int(timestamp) == int(self.__newest_history_key): time.sleep(timestamp - self.__newest_history_key) threshold = int(os.getenv('SNAPSHOT_BROTLI_COMPRESSION_THRESHOLD', 1024)) skip_brotli = strtobool(os.getenv('DISABLE_BROTLI_TEXT_SNAPSHOT', 'False')) if not skip_brotli and len(contents) > threshold: snapshot_fname = f"{snapshot_id}.txt.br" dest = os.path.join(self.watch_data_dir, snapshot_fname) if not os.path.exists(dest): with open(dest, 'wb') as f: f.write(brotli.compress(contents, mode=brotli.MODE_TEXT)) else: snapshot_fname = f"{snapshot_id}.txt" dest = os.path.join(self.watch_data_dir, snapshot_fname) if not os.path.exists(dest): with open(dest, 'wb') as f: f.write(contents) # Append to index # @todo check last char was \n index_fname = os.path.join(self.watch_data_dir, "history.txt") with open(index_fname, 'a') as f: f.write("{},{}\n".format(timestamp, snapshot_fname)) f.close() self.__newest_history_key = timestamp self.__history_n += 1 # @todo bump static cache of the last timestamp so we dont need to examine the file to set a proper ''viewed'' status return snapshot_fname @property @property def has_empty_checktime(self): # using all() + dictionary comprehension # Check if all values are 0 in dictionary res = all(x == None or x == False or x==0 for x in self.get('time_between_check', {}).values()) return res def threshold_seconds(self): seconds = 0 for m, n in mtable.items(): x = self.get('time_between_check', {}).get(m, None) if x: seconds += x * n return seconds # Iterate over all history texts and see if something new exists def lines_contain_something_unique_compared_to_history(self, lines: list): local_lines = set([l.decode('utf-8').strip().lower() for l in lines]) # Compare each lines (set) against each history text file (set) looking for something new.. existing_history = set({}) for k, v in self.history.items(): content = self.get_history_snapshot(k) alist = set([line.strip().lower() for line in content.splitlines()]) existing_history = existing_history.union(alist) # Check that everything in local_lines(new stuff) already exists in existing_history - it should # if not, something new happened return not local_lines.issubset(existing_history) def get_screenshot(self): fname = os.path.join(self.watch_data_dir, "last-screenshot.png") if os.path.isfile(fname): return fname # False is not an option for AppRise, must be type None return None def __get_file_ctime(self, filename): fname = os.path.join(self.watch_data_dir, filename) if os.path.isfile(fname): return int(os.path.getmtime(fname)) return False @property def error_text_ctime(self): return self.__get_file_ctime('last-error.txt') @property def snapshot_text_ctime(self): if self.history_n==0: return False timestamp = list(self.history.keys())[-1] return int(timestamp) @property def snapshot_screenshot_ctime(self): return self.__get_file_ctime('last-screenshot.png') @property def snapshot_error_screenshot_ctime(self): return self.__get_file_ctime('last-error-screenshot.png') @property def watch_data_dir(self): # The base dir of the watch data return os.path.join(self.__datastore_path, self['uuid']) def get_error_text(self): """Return the text saved from a previous request that resulted in a non-200 error""" fname = os.path.join(self.watch_data_dir, "last-error.txt") if os.path.isfile(fname): with open(fname, 'r') as f: return f.read() return False def get_error_snapshot(self): """Return path to the screenshot that resulted in a non-200 error""" fname = os.path.join(self.watch_data_dir, "last-error-screenshot.png") if os.path.isfile(fname): return fname return False def pause(self): self['paused'] = True def unpause(self): self['paused'] = False def toggle_pause(self): self['paused'] ^= True def mute(self): self['notification_muted'] = True def unmute(self): self['notification_muted'] = False def toggle_mute(self): self['notification_muted'] ^= True def extract_regex_from_all_history(self, regex): import csv import re import datetime csv_output_filename = False csv_writer = False f = None # self.history will be keyed with the full path for k, fname in self.history.items(): if os.path.isfile(fname): if True: contents = self.get_history_snapshot(k) res = re.findall(regex, contents, re.MULTILINE) if res: if not csv_writer: # A file on the disk can be transferred much faster via flask than a string reply csv_output_filename = 'report.csv' f = open(os.path.join(self.watch_data_dir, csv_output_filename), 'w') # @todo some headers in the future #fieldnames = ['Epoch seconds', 'Date'] csv_writer = csv.writer(f, delimiter=',', quotechar='"', quoting=csv.QUOTE_MINIMAL, #fieldnames=fieldnames ) csv_writer.writerow(['Epoch seconds', 'Date']) # csv_writer.writeheader() date_str = datetime.datetime.fromtimestamp(int(k)).strftime('%Y-%m-%d %H:%M:%S') for r in res: row = [k, date_str] if isinstance(r, str): row.append(r) else: row+=r csv_writer.writerow(row) if f: f.close() return csv_output_filename def has_special_diff_filter_options_set(self): # All False - nothing would be done, so act like it's not processable if not self.get('filter_text_added', True) and not self.get('filter_text_replaced', True) and not self.get('filter_text_removed', True): return False # Or one is set if not self.get('filter_text_added', True) or not self.get('filter_text_replaced', True) or not self.get('filter_text_removed', True): return True # None is set return False def get_last_fetched_before_filters(self): import brotli filepath = os.path.join(self.watch_data_dir, 'last-fetched.br') if not os.path.isfile(filepath): # If a previous attempt doesnt yet exist, just snarf the previous snapshot instead dates = list(self.history.keys()) if len(dates): return self.get_history_snapshot(dates[-1]) else: return '' with open(filepath, 'rb') as f: return(brotli.decompress(f.read()).decode('utf-8')) def save_last_fetched_before_filters(self, contents): import brotli filepath = os.path.join(self.watch_data_dir, 'last-fetched.br') with open(filepath, 'wb') as f: f.write(brotli.compress(contents, mode=brotli.MODE_TEXT)) @property def get_browsersteps_available_screenshots(self): "For knowing which screenshots are available to show the user in BrowserSteps UI" available = [] for f in Path(self.watch_data_dir).glob('step_before-*.jpeg'): step_n=re.search(r'step_before-(\d+)', f.name) if step_n: available.append(step_n.group(1)) return available