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623 lines
25 KiB
623 lines
25 KiB
from flask import (
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flash
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)
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import json
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import logging
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import os
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import threading
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import time
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import uuid as uuid_builder
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from copy import deepcopy
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from os import path, unlink
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from threading import Lock
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import re
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import requests
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import secrets
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from . model import App, Watch
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# Is there an existing library to ensure some data store (JSON etc) is in sync with CRUD methods?
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# Open a github issue if you know something :)
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# https://stackoverflow.com/questions/6190468/how-to-trigger-function-on-value-change
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class ChangeDetectionStore:
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lock = Lock()
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# For general updates/writes that can wait a few seconds
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needs_write = False
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# For when we edit, we should write to disk
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needs_write_urgent = False
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__version_check = True
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def __init__(self, datastore_path="/datastore", include_default_watches=True, version_tag="0.0.0"):
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# Should only be active for docker
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# logging.basicConfig(filename='/dev/stdout', level=logging.INFO)
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self.__data = App.model()
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self.datastore_path = datastore_path
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self.json_store_path = "{}/url-watches.json".format(self.datastore_path)
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self.needs_write = False
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self.proxy_list = None
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self.start_time = time.time()
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self.stop_thread = False
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# Base definition for all watchers
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# deepcopy part of #569 - not sure why its needed exactly
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self.generic_definition = deepcopy(Watch.model(datastore_path = datastore_path, default={}))
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if path.isfile('changedetectionio/source.txt'):
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with open('changedetectionio/source.txt') as f:
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# Should be set in Dockerfile to look for /source.txt , this will give us the git commit #
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# So when someone gives us a backup file to examine, we know exactly what code they were running.
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self.__data['build_sha'] = f.read()
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try:
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# @todo retest with ", encoding='utf-8'"
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with open(self.json_store_path) as json_file:
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from_disk = json.load(json_file)
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# @todo isnt there a way todo this dict.update recursively?
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# Problem here is if the one on the disk is missing a sub-struct, it wont be present anymore.
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if 'watching' in from_disk:
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self.__data['watching'].update(from_disk['watching'])
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if 'app_guid' in from_disk:
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self.__data['app_guid'] = from_disk['app_guid']
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if 'settings' in from_disk:
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if 'headers' in from_disk['settings']:
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self.__data['settings']['headers'].update(from_disk['settings']['headers'])
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if 'requests' in from_disk['settings']:
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self.__data['settings']['requests'].update(from_disk['settings']['requests'])
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if 'application' in from_disk['settings']:
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self.__data['settings']['application'].update(from_disk['settings']['application'])
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# Convert each existing watch back to the Watch.model object
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for uuid, watch in self.__data['watching'].items():
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watch['uuid']=uuid
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self.__data['watching'][uuid] = Watch.model(datastore_path=self.datastore_path, default=watch)
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print("Watching:", uuid, self.__data['watching'][uuid]['url'])
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# First time ran, doesnt exist.
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except (FileNotFoundError, json.decoder.JSONDecodeError):
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if include_default_watches:
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print("Creating JSON store at", self.datastore_path)
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self.add_watch(url='https://news.ycombinator.com/',
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tag='Tech news',
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extras={'fetch_backend': 'html_requests'})
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self.add_watch(url='https://changedetection.io/CHANGELOG.txt',
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tag='changedetection.io',
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extras={'fetch_backend': 'html_requests'})
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self.__data['version_tag'] = version_tag
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# Helper to remove password protection
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password_reset_lockfile = "{}/removepassword.lock".format(self.datastore_path)
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if path.isfile(password_reset_lockfile):
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self.__data['settings']['application']['password'] = False
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unlink(password_reset_lockfile)
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if not 'app_guid' in self.__data:
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import os
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import sys
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if "pytest" in sys.modules or "PYTEST_CURRENT_TEST" in os.environ:
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self.__data['app_guid'] = "test-" + str(uuid_builder.uuid4())
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else:
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self.__data['app_guid'] = str(uuid_builder.uuid4())
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# Generate the URL access token for RSS feeds
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if not 'rss_access_token' in self.__data['settings']['application']:
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secret = secrets.token_hex(16)
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self.__data['settings']['application']['rss_access_token'] = secret
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# Generate the API access token
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if not 'api_access_token' in self.__data['settings']['application']:
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secret = secrets.token_hex(16)
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self.__data['settings']['application']['api_access_token'] = secret
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# Proxy list support - available as a selection in settings when text file is imported
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proxy_list_file = "{}/proxies.json".format(self.datastore_path)
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if path.isfile(proxy_list_file):
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self.import_proxy_list(proxy_list_file)
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# Bump the update version by running updates
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self.run_updates()
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self.needs_write = True
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# Finally start the thread that will manage periodic data saves to JSON
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save_data_thread = threading.Thread(target=self.save_datastore).start()
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def set_last_viewed(self, uuid, timestamp):
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logging.debug("Setting watch UUID: {} last viewed to {}".format(uuid, int(timestamp)))
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self.data['watching'][uuid].update({'last_viewed': int(timestamp)})
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self.needs_write = True
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def remove_password(self):
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self.__data['settings']['application']['password'] = False
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self.needs_write = True
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def update_watch(self, uuid, update_obj):
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# It's possible that the watch could be deleted before update
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if not self.__data['watching'].get(uuid):
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return
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with self.lock:
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# In python 3.9 we have the |= dict operator, but that still will lose data on nested structures...
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for dict_key, d in self.generic_definition.items():
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if isinstance(d, dict):
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if update_obj is not None and dict_key in update_obj:
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self.__data['watching'][uuid][dict_key].update(update_obj[dict_key])
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del (update_obj[dict_key])
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self.__data['watching'][uuid].update(update_obj)
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self.needs_write = True
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@property
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def threshold_seconds(self):
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seconds = 0
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for m, n in Watch.mtable.items():
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x = self.__data['settings']['requests']['time_between_check'].get(m)
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if x:
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seconds += x * n
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return seconds
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@property
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def has_unviewed(self):
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for uuid, watch in self.__data['watching'].items():
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if watch.viewed == False:
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return True
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return False
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@property
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def data(self):
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has_unviewed = False
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for uuid, watch in self.__data['watching'].items():
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# #106 - Be sure this is None on empty string, False, None, etc
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# Default var for fetch_backend
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# @todo this may not be needed anymore, or could be easily removed
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if not self.__data['watching'][uuid]['fetch_backend']:
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self.__data['watching'][uuid]['fetch_backend'] = self.__data['settings']['application']['fetch_backend']
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# Re #152, Return env base_url if not overriden, @todo also prefer the proxy pass url
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env_base_url = os.getenv('BASE_URL','')
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if not self.__data['settings']['application']['base_url']:
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self.__data['settings']['application']['base_url'] = env_base_url.strip('" ')
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return self.__data
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def get_all_tags(self):
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tags = []
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for uuid, watch in self.data['watching'].items():
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if watch['tag'] is None:
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continue
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# Support for comma separated list of tags.
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for tag in watch['tag'].split(','):
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tag = tag.strip()
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if tag not in tags:
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tags.append(tag)
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tags.sort()
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return tags
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def unlink_history_file(self, path):
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try:
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unlink(path)
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except (FileNotFoundError, IOError):
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pass
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# Delete a single watch by UUID
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def delete(self, uuid):
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with self.lock:
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if uuid == 'all':
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self.__data['watching'] = {}
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# GitHub #30 also delete history records
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for uuid in self.data['watching']:
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for path in self.data['watching'][uuid].history.values():
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self.unlink_history_file(path)
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else:
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for path in self.data['watching'][uuid].history.values():
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self.unlink_history_file(path)
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del self.data['watching'][uuid]
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self.needs_write_urgent = True
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# Clone a watch by UUID
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def clone(self, uuid):
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url = self.data['watching'][uuid]['url']
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tag = self.data['watching'][uuid]['tag']
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extras = self.data['watching'][uuid]
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new_uuid = self.add_watch(url=url, tag=tag, extras=extras)
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return new_uuid
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def url_exists(self, url):
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# Probably their should be dict...
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for watch in self.data['watching'].values():
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if watch['url'] == url:
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return True
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return False
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# Remove a watchs data but keep the entry (URL etc)
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def clear_watch_history(self, uuid):
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import pathlib
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self.__data['watching'][uuid].update(
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{'last_checked': 0,
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'last_viewed': 0,
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'previous_md5': False,
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'last_notification_error': False,
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'last_error': False})
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# JSON Data, Screenshots, Textfiles (history index and snapshots), HTML in the future etc
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for item in pathlib.Path(os.path.join(self.datastore_path, uuid)).rglob("*.*"):
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unlink(item)
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# Force the attr to recalculate
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bump = self.__data['watching'][uuid].history
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self.needs_write_urgent = True
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def add_watch(self, url, tag="", extras=None, write_to_disk_now=True):
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if extras is None:
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extras = {}
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# should always be str
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if tag is None or not tag:
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tag = ''
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# Incase these are copied across, assume it's a reference and deepcopy()
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apply_extras = deepcopy(extras)
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# Was it a share link? try to fetch the data
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if (url.startswith("https://changedetection.io/share/")):
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try:
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r = requests.request(method="GET",
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url=url,
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# So we know to return the JSON instead of the human-friendly "help" page
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headers={'App-Guid': self.__data['app_guid']})
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res = r.json()
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# List of permissible attributes we accept from the wild internet
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for k in [
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'body',
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'css_filter',
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'extract_text',
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'extract_title_as_title',
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'headers',
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'ignore_text',
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'include_filters',
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'method',
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'paused',
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'previous_md5',
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'subtractive_selectors',
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'tag',
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'text_should_not_be_present',
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'title',
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'trigger_text',
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'url',
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'webdriver_js_execute_code',
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]:
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if res.get(k):
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if k != 'css_filter':
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apply_extras[k] = res[k]
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else:
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# We renamed the field and made it a list
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apply_extras['include_filters'] = [res['css_filter']]
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except Exception as e:
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logging.error("Error fetching metadata for shared watch link", url, str(e))
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flash("Error fetching metadata for {}".format(url), 'error')
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return False
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with self.lock:
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# #Re 569
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new_watch = Watch.model(datastore_path=self.datastore_path, default={
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'url': url,
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'tag': tag
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})
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new_uuid = new_watch['uuid']
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logging.debug("Added URL {} - {}".format(url, new_uuid))
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for k in ['uuid', 'history', 'last_checked', 'last_changed', 'newest_history_key', 'previous_md5', 'viewed']:
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if k in apply_extras:
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del apply_extras[k]
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new_watch.update(apply_extras)
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self.__data['watching'][new_uuid] = new_watch
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self.__data['watching'][new_uuid].ensure_data_dir_exists()
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if write_to_disk_now:
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self.sync_to_json()
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return new_uuid
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def visualselector_data_is_ready(self, watch_uuid):
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output_path = "{}/{}".format(self.datastore_path, watch_uuid)
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screenshot_filename = "{}/last-screenshot.png".format(output_path)
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elements_index_filename = "{}/elements.json".format(output_path)
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if path.isfile(screenshot_filename) and path.isfile(elements_index_filename) :
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return True
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return False
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# Save as PNG, PNG is larger but better for doing visual diff in the future
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def save_screenshot(self, watch_uuid, screenshot: bytes, as_error=False):
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if not self.data['watching'].get(watch_uuid):
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return
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if as_error:
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target_path = os.path.join(self.datastore_path, watch_uuid, "last-error-screenshot.png")
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else:
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target_path = os.path.join(self.datastore_path, watch_uuid, "last-screenshot.png")
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self.data['watching'][watch_uuid].ensure_data_dir_exists()
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with open(target_path, 'wb') as f:
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f.write(screenshot)
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f.close()
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# Make a JPEG that's used in notifications (due to being a smaller size) available
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from PIL import Image
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im1 = Image.open(target_path)
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im1.convert('RGB').save(target_path.replace('.png','.jpg'), quality=int(os.getenv("NOTIFICATION_SCREENSHOT_JPG_QUALITY", 75)))
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def save_error_text(self, watch_uuid, contents):
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if not self.data['watching'].get(watch_uuid):
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return
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target_path = os.path.join(self.datastore_path, watch_uuid, "last-error.txt")
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with open(target_path, 'w') as f:
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f.write(contents)
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def save_xpath_data(self, watch_uuid, data, as_error=False):
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if not self.data['watching'].get(watch_uuid):
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return
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if as_error:
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target_path = os.path.join(self.datastore_path, watch_uuid, "elements-error.json")
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else:
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target_path = os.path.join(self.datastore_path, watch_uuid, "elements.json")
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with open(target_path, 'w') as f:
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f.write(json.dumps(data))
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f.close()
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def sync_to_json(self):
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logging.info("Saving JSON..")
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print("Saving JSON..")
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try:
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data = deepcopy(self.__data)
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except RuntimeError as e:
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# Try again in 15 seconds
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time.sleep(15)
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logging.error ("! Data changed when writing to JSON, trying again.. %s", str(e))
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self.sync_to_json()
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return
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else:
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try:
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# Re #286 - First write to a temp file, then confirm it looks OK and rename it
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# This is a fairly basic strategy to deal with the case that the file is corrupted,
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# system was out of memory, out of RAM etc
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with open(self.json_store_path+".tmp", 'w') as json_file:
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json.dump(data, json_file, indent=4)
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os.replace(self.json_store_path+".tmp", self.json_store_path)
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except Exception as e:
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logging.error("Error writing JSON!! (Main JSON file save was skipped) : %s", str(e))
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self.needs_write = False
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self.needs_write_urgent = False
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# Thread runner, this helps with thread/write issues when there are many operations that want to update the JSON
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# by just running periodically in one thread, according to python, dict updates are threadsafe.
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def save_datastore(self):
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while True:
|
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if self.stop_thread:
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print("Shutting down datastore thread")
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return
|
|
|
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if self.needs_write or self.needs_write_urgent:
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self.sync_to_json()
|
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|
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# Once per minute is enough, more and it can cause high CPU usage
|
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# better here is to use something like self.app.config.exit.wait(1), but we cant get to 'app' from here
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for i in range(120):
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time.sleep(0.5)
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if self.stop_thread or self.needs_write_urgent:
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break
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|
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# Go through the datastore path and remove any snapshots that are not mentioned in the index
|
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# This usually is not used, but can be handy.
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def remove_unused_snapshots(self):
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print ("Removing snapshots from datastore that are not in the index..")
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|
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index=[]
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for uuid in self.data['watching']:
|
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for id in self.data['watching'][uuid].history:
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index.append(self.data['watching'][uuid].history[str(id)])
|
|
|
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import pathlib
|
|
|
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# Only in the sub-directories
|
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for uuid in self.data['watching']:
|
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for item in pathlib.Path(self.datastore_path).rglob(uuid+"/*.txt"):
|
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if not str(item) in index:
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print ("Removing",item)
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unlink(item)
|
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|
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def import_proxy_list(self, filename):
|
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with open(filename) as f:
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self.proxy_list = json.load(f)
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print ("Registered proxy list", list(self.proxy_list.keys()))
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|
|
|
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def get_preferred_proxy_for_watch(self, uuid):
|
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"""
|
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Returns the preferred proxy by ID key
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:param uuid: UUID
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:return: proxy "key" id
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"""
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|
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proxy_id = None
|
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if self.proxy_list is None:
|
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return None
|
|
|
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# If its a valid one
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watch = self.data['watching'].get(uuid)
|
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|
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if watch.get('proxy') and watch.get('proxy') in list(self.proxy_list.keys()):
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return watch.get('proxy')
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|
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# not valid (including None), try the system one
|
|
else:
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system_proxy_id = self.data['settings']['requests'].get('proxy')
|
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# Is not None and exists
|
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if self.proxy_list.get(system_proxy_id):
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return system_proxy_id
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|
|
# Fallback - Did not resolve anything, use the first available
|
|
if system_proxy_id is None:
|
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first_default = list(self.proxy_list)[0]
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return first_default
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|
|
return None
|
|
|
|
# Run all updates
|
|
# IMPORTANT - Each update could be run even when they have a new install and the schema is correct
|
|
# So therefor - each `update_n` should be very careful about checking if it needs to actually run
|
|
# Probably we should bump the current update schema version with each tag release version?
|
|
def run_updates(self):
|
|
import inspect
|
|
import shutil
|
|
|
|
updates_available = []
|
|
for i, o in inspect.getmembers(self, predicate=inspect.ismethod):
|
|
m = re.search(r'update_(\d+)$', i)
|
|
if m:
|
|
updates_available.append(int(m.group(1)))
|
|
updates_available.sort()
|
|
|
|
for update_n in updates_available:
|
|
if update_n > self.__data['settings']['application']['schema_version']:
|
|
print ("Applying update_{}".format((update_n)))
|
|
# Wont exist on fresh installs
|
|
if os.path.exists(self.json_store_path):
|
|
shutil.copyfile(self.json_store_path, self.datastore_path+"/url-watches-before-{}.json".format(update_n))
|
|
|
|
try:
|
|
update_method = getattr(self, "update_{}".format(update_n))()
|
|
except Exception as e:
|
|
print("Error while trying update_{}".format((update_n)))
|
|
print(e)
|
|
# Don't run any more updates
|
|
return
|
|
else:
|
|
# Bump the version, important
|
|
self.__data['settings']['application']['schema_version'] = update_n
|
|
|
|
# Convert minutes to seconds on settings and each watch
|
|
def update_1(self):
|
|
if self.data['settings']['requests'].get('minutes_between_check'):
|
|
self.data['settings']['requests']['time_between_check']['minutes'] = self.data['settings']['requests']['minutes_between_check']
|
|
# Remove the default 'hours' that is set from the model
|
|
self.data['settings']['requests']['time_between_check']['hours'] = None
|
|
|
|
for uuid, watch in self.data['watching'].items():
|
|
if 'minutes_between_check' in watch:
|
|
# Only upgrade individual watch time if it was set
|
|
if watch.get('minutes_between_check', False):
|
|
self.data['watching'][uuid]['time_between_check']['minutes'] = watch['minutes_between_check']
|
|
|
|
# Move the history list to a flat text file index
|
|
# Better than SQLite because this list is only appended to, and works across NAS / NFS type setups
|
|
def update_2(self):
|
|
# @todo test running this on a newly updated one (when this already ran)
|
|
for uuid, watch in self.data['watching'].items():
|
|
history = []
|
|
|
|
if watch.get('history', False):
|
|
for d, p in watch['history'].items():
|
|
d = int(d) # Used to be keyed as str, we'll fix this now too
|
|
history.append("{},{}\n".format(d,p))
|
|
|
|
if len(history):
|
|
target_path = os.path.join(self.datastore_path, uuid)
|
|
if os.path.exists(target_path):
|
|
with open(os.path.join(target_path, "history.txt"), "w") as f:
|
|
f.writelines(history)
|
|
else:
|
|
logging.warning("Datastore history directory {} does not exist, skipping history import.".format(target_path))
|
|
|
|
# No longer needed, dynamically pulled from the disk when needed.
|
|
# But we should set it back to a empty dict so we don't break if this schema runs on an earlier version.
|
|
# In the distant future we can remove this entirely
|
|
self.data['watching'][uuid]['history'] = {}
|
|
|
|
# We incorrectly stored last_changed when there was not a change, and then confused the output list table
|
|
def update_3(self):
|
|
# see https://github.com/dgtlmoon/changedetection.io/pull/835
|
|
return
|
|
|
|
# `last_changed` not needed, we pull that information from the history.txt index
|
|
def update_4(self):
|
|
for uuid, watch in self.data['watching'].items():
|
|
try:
|
|
# Remove it from the struct
|
|
del(watch['last_changed'])
|
|
except:
|
|
continue
|
|
return
|
|
|
|
def update_5(self):
|
|
# If the watch notification body, title look the same as the global one, unset it, so the watch defaults back to using the main settings
|
|
# In other words - the watch notification_title and notification_body are not needed if they are the same as the default one
|
|
current_system_body = self.data['settings']['application']['notification_body'].translate(str.maketrans('', '', "\r\n "))
|
|
current_system_title = self.data['settings']['application']['notification_body'].translate(str.maketrans('', '', "\r\n "))
|
|
for uuid, watch in self.data['watching'].items():
|
|
try:
|
|
watch_body = watch.get('notification_body', '')
|
|
if watch_body and watch_body.translate(str.maketrans('', '', "\r\n ")) == current_system_body:
|
|
# Looks the same as the default one, so unset it
|
|
watch['notification_body'] = None
|
|
|
|
watch_title = watch.get('notification_title', '')
|
|
if watch_title and watch_title.translate(str.maketrans('', '', "\r\n ")) == current_system_title:
|
|
# Looks the same as the default one, so unset it
|
|
watch['notification_title'] = None
|
|
except Exception as e:
|
|
continue
|
|
return
|
|
|
|
|
|
# We incorrectly used common header overrides that should only apply to Requests
|
|
# These are now handled in content_fetcher::html_requests and shouldnt be passed to Playwright/Selenium
|
|
def update_7(self):
|
|
# These were hard-coded in early versions
|
|
for v in ['User-Agent', 'Accept', 'Accept-Encoding', 'Accept-Language']:
|
|
if self.data['settings']['headers'].get(v):
|
|
del self.data['settings']['headers'][v]
|
|
|
|
# Convert filters to a list of filters css_filter -> include_filters
|
|
def update_8(self):
|
|
for uuid, watch in self.data['watching'].items():
|
|
try:
|
|
existing_filter = watch.get('css_filter', '')
|
|
if existing_filter:
|
|
watch['include_filters'] = [existing_filter]
|
|
except:
|
|
continue
|
|
return |