214 lines
7.0 KiB
Python
214 lines
7.0 KiB
Python
#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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"""
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iCalendar (parsing) module for Inky-Calendar Project
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Copyright by aceisace
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"""
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""" ---info about iCalendars---
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• all day events start at midnight, ending at midnight of the next day
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• iCalendar saves all event timings in UTC -> need to be converted into local
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time
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• Only non-all_day events or multi-day need to be converted to
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local timezone. Converting all-day events to local timezone is a problem!
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"""
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import arrow
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from urllib.request import urlopen
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import logging
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import time
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import os
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try:
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import recurring_ical_events
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except ModuleNotFoundError:
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print('recurring-ical-events library could not be found.')
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print('Please install this with: pip3 install recurring-ical-events')
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try:
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from icalendar import Calendar, Event
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except ModuleNotFoundError:
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print('icalendar library could not be found. Please install this with:')
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print('pip3 install icalendar')
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filename = os.path.basename(__file__).split('.py')[0]
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logger = logging.getLogger(filename)
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class iCalendar:
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"""iCalendar parsing moudule for inkycal.
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Parses events from given iCalendar URLs / paths"""
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def __init__(self):
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self.icalendars = []
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self.parsed_events = []
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def load_url(self, url, username=None, password=None):
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"""Input a string or list of strings containing valid iCalendar URLs
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example: 'URL1' (single url) OR ['URL1', 'URL2'] (multiple URLs)
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add username and password to access protected files
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"""
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if type(url) == list:
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if (username == None) and (password == None):
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ical = [Calendar.from_ical(str(urlopen(_).read().decode()))
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for _ in url]
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else:
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ical = [auth_ical(each_url, username, password) for each_url in url]
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elif type(url) == str:
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if (username == None) and (password == None):
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ical = [Calendar.from_ical(str(urlopen(url).read().decode()))]
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else:
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ical = [auth_ical(url, username, password)]
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else:
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raise Exception ("Input: '{}' is not a string or list!".format(url))
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def auth_ical(url, uname, passwd):
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"""Authorisation helper for protected ical files"""
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# Credit to Joshka
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password_mgr = urllib.request.HTTPPasswordMgrWithDefaultRealm()
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password_mgr.add_password(None, url, username, password)
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handler = urllib.request.HTTPBasicAuthHandler(password_mgr)
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opener = urllib.request.build_opener(handler)
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ical = Calendar.from_ical(str(opener.open(url).read().decode()))
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return ical
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# Add the parsed icalendar/s to the self.icalendars list
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if ical: self.icalendars += ical
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logger.info('loaded iCalendars from URLs')
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def load_from_file(self, filepath):
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"""Input a string or list of strings containing valid iCalendar filepaths
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example: 'path1' (single file) OR ['path1', 'path2'] (multiple files)
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returns a list of iCalendars as string (raw)
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"""
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if type(url) == list:
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ical = (Calendar.from_ical(open(path)) for path in filepath)
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elif type(url) == str:
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ical = (Calendar.from_ical(open(path)))
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else:
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raise Exception ("Input: '{}' is not a string or list!".format(url))
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self.icalendars += icals
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logger.info('loaded iCalendars from filepaths')
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def get_events(self, timeline_start, timeline_end, timezone=None):
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"""Input an arrow (time) object for:
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* the beginning of timeline (events have to end after this time)
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* the end of the timeline (events have to begin before this time)
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* timezone if events should be formatted to local time
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Returns a list of events sorted by date
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"""
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if type(timeline_start) == arrow.arrow.Arrow:
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if timezone == None:
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timezone = 'UTC'
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t_start = timeline_start
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t_end = timeline_end
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else:
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raise Exception('Please input a valid arrow (time) object!')
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# parse non-recurring events
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# Recurring events time-span has to be in this format:
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# "%Y%m%dT%H%M%SZ" (python strftime)
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fmt = lambda date: (date.year, date.month, date.day, date.hour,
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date.minute, date.second)
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t_start_recurring = fmt(t_start)
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t_end_recurring = fmt(t_end)
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# Fetch recurring events
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recurring_events = (recurring_ical_events.of(ical).between(
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t_start_recurring, t_end_recurring)
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for ical in self.icalendars)
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events = (
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{
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'title': events.get('SUMMARY').lstrip(),
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'begin': arrow.get(events.get('DTSTART').dt).to(timezone) if (
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arrow.get(events.get('dtstart').dt).format('HH:mm') != '00:00')
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else arrow.get(events.get('DTSTART').dt).replace(tzinfo=timezone),
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'end':arrow.get(events.get("DTEND").dt).to(timezone) if (
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arrow.get(events.get('dtstart').dt).format('HH:mm') != '00:00')
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else arrow.get(events.get('DTEND').dt).replace(tzinfo=timezone)
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} for ical in recurring_events for events in ical)
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# if any recurring events were found, add them to parsed_events
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if events: self.parsed_events += list(events)
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# Sort events by their beginning date
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self.sort()
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return self.parsed_events
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def sort(self):
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"""Sort all parsed events in order of beginning time"""
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if not self.parsed_events:
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logger.debug('no events found to be sorted')
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else:
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# sort events by date
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by_date = lambda event: event['begin']
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self.parsed_events.sort(key=by_date)
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def clear_events(self):
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"""clear previously parsed events"""
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self.parsed_events = []
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@staticmethod
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def all_day(event):
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"""Check if an event is an all day event.
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Returns True if event is all day, else False
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"""
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if not ('end' and 'begin') in event:
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print('Events must have a starting and ending time')
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raise Exception('This event is not valid!')
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else:
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begin, end = event['begin'], event['end']
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duration = end - begin
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if (begin.format('HH:mm') == '00:00' and end.format('HH:mm') == '00:00'
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and duration.days >= 1):
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return True
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else:
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return False
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@staticmethod
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def get_system_tz():
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"""Get the timezone set by the system"""
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try:
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local_tz = time.tzname[1]
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except:
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print('System timezone could not be parsed!')
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print('Please set timezone manually!. Setting timezone to None...')
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local_tz = None
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return local_tz
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def show_events(self, fmt='DD MMM YY HH:mm'):
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"""print all parsed events in a more readable way
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use the format (fmt) parameter to specify the date format
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see https://arrow.readthedocs.io/en/latest/#supported-tokens
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for more info tokens
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"""
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if not self.parsed_events:
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logger.debug('no events found to be shown')
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else:
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line_width = max(len(_['title']) for _ in self.parsed_events)
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for events in self.parsed_events:
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title = events['title']
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begin, end = events['begin'].format(fmt), events['end'].format(fmt)
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print('{0} {1} | {2} | {3}'.format(
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title, ' ' * (line_width - len(title)), begin, end))
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if __name__ == '__main__':
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print('running {0} in standalone mode'.format(filename))
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