chiark - git - matthewv - gooswapper/blob - gooswapper.py

   1 #!/usr/bin/env python3
   2
   3 import sys
   4 import getpass
   5 import os
   6 import pickle
   7 import logging
   8 logger = logging.getLogger('gooswapper')
   9 logger.setLevel(logging.INFO)
  10 consolelog = logging.StreamHandler()
  11 consolelog.setLevel(logging.INFO)
  12 logformatter = logging.Formatter('%(name)s - %(levelname)s - %(message)s')
  13 consolelog.setFormatter(logformatter)
  14 logger.addHandler(consolelog)
  15 #We can't use this, because that way all the libraries' logs spam us
  16 #logging.basicConfig(level=logging.INFO)
  17
  18 #Exchange-related library
  19 sys.path.append("/upstreams/exchangelib")
  20 import exchangelib
  21
  22 #Google calendar-api libraries
  23 import httplib2
  24 import apiclient.discovery
  25 import oauth2client
  26 import oauth2client.file
  27 import oauth2client.client
  28
  29 #Not sure what the distribution approach here is...
  30 gcal_client_id = '805127902516-ptbbtgpq9o8pjr6r3k6hsm60j589o85u.apps.googleusercontent.com'
  31 gcal_client_secret = '8hpdxV3MauorryTDoZ1YK8JO'
  32
  33 #scope URL for r/w calendar access
  34 scope = 'https://www.googleapis.com/auth/calendar'
  35 #flow object, for doing OAuth2.0 stuff
  36 flow = oauth2client.client.OAuth2WebServerFlow(gcal_client_id,
  37                                                gcal_client_secret,
  38                                                scope)
  39
  40
  41 gcal_authpath=".gooswap_gcal_creds.dat"
  42
  43 cachepath=".gooswapcache"
  44
  45 exchange_credential = None
  46
  47 class ex_gcal_link(exchangelib.ExtendedProperty):
  48     distinguished_property_set_id = 'PublicStrings'
  49     property_name = "google calendar event id"
  50     property_type = 'String'
  51
  52 exchangelib.CalendarItem.register('gcal_link',ex_gcal_link)
  53
  54 def get_ex_event_by_itemid(calendar,itemid):
  55     return calendar.get(item_id=itemid)
  56
  57 def get_ex_event_by_id_and_changekey(acct,itemid,changekey):
  58     l=list(acct.fetch([(itemid,changekey)]))
  59     return list(acct.fetch([(itemid,changekey)]))[0]
  60
  61 def get_ex_cred(username="SANGER\mv3",password=None):
  62     if password is None:
  63         password = getpass.getpass(prompt="Password for user %s: " % username)
  64     return exchangelib.ServiceAccount(username,password)
  65
  66 def ex_login(emailaddr,autodiscover=True):
  67     global exchange_credential
  68     if exchange_credential is None:
  69         exchange_credential = get_ex_cred()
  70     return exchangelib.Account(emailaddr,
  71                                credentials = exchange_credential,
  72                                autodiscover = autodiscover)
  73
  74 def get_ex_events(calendar):
  75     ans={}
  76     for event in calendar.all().only('changekey','item_id','gcal_link'):
  77         if event.gcal_link is not None:
  78 #            event.delete()
  79             continue
  80         if event.item_id in ans:
  81             logger.warning("Event item_id %s was duplicated!" % event.item_id)
  82         ans[event.item_id] = event.changekey
  83     logger.info("%d events found" % len(ans))
  84     return ans
  85
  86 def ex_event_changes(old,new):
  87     olds = set(old.keys())
  88     news = set(new.keys())
  89     added = list(news-olds)
  90     deleted = list(olds-news)
  91     changed = []
  92     #intersection - i.e. common to both sets
  93     for event in olds & news:
  94         if old[event] != new[event]:
  95             changed.append(event)
  96     logger.info("%d events updated, %d added, %d deleted" % (len(changed),
  97                                                               len(added),
  98                                                               len(deleted)))
  99     return added, deleted, changed
 100
 101 def add_ex_to_gcal(ex_acct,
 102                    gcal_acct,gcal_tz,events,
 103                    added,
 104                    gcal_id="primary"):
 105     for ev_id in added:
 106         event = get_ex_event_by_itemid(ex_acct.calendar,ev_id)
 107         if event.is_all_day:
 108             gevent={}
 109             gevent["summary"]=event.subject
 110             gevent["end"]={"date": str(event.end.astimezone(gcal_tz).date())}
 111             gevent["start"]={"date": str(event.start.astimezone(gcal_tz).date())}
 112             if event.text_body.strip() != '':
 113                 gevent["description"] = event.text_body
 114             if event.location is not None:
 115                 gevent["location"] = event.location
 116             gevent["extended_properties"]={"shared": {"ex_id": event.item_id}}
 117             gevent=gcal_acct.events().insert(calendarId=gcal_id, body=gevent).execute()
 118             event.gcal_link = gevent.get("id")
 119             event.save()
 120             events[event.item_id] = event.changekey
 121         else:
 122             logger.warning("only all-day events supported")
 123
 124 def get_gcal_cred():
 125     #each such file can only store a single credential
 126     storage = oauth2client.file.Storage(gcal_authpath)
 127     gcal_credential = storage.get()
 128     #if no credential found, or they're invalid (e.g. expired),
 129     #then get a new one; pass --noauth_local_webserver on the command line
 130     #if you don't want it to spawn a browser
 131     if gcal_credential is None or gcal_credential.invalid:
 132         gcal_credential = oauth2client.tools.run_flow(flow,
 133                                                       storage,
 134                                                       oauth2client.tools.argparser.parse_args())
 135     return gcal_credential
 136
 137 def gcal_login():
 138     gcal_credential = get_gcal_cred()
 139     # Object to handle http requests; could add proxy details
 140     http = httplib2.Http()
 141     http = gcal_credential.authorize(http)
 142     return apiclient.discovery.build('calendar', 'v3', http=http)
 143
 144 def get_gcal_timezone(gcal_account,calendarid="primary"):
 145     gcal = gcal_account.calendars().get(calendarId=calendarid).execute()
 146     return exchangelib.EWSTimeZone.timezone(gcal['timeZone'])
 147
 148 def main():
 149     try:
 150         with open(cachepath,"rb") as f:
 151             cache = pickle.load(f)
 152     except FileNotFoundError:
 153         cache = None
 154
 155     ex_account = ex_login("mv3@sanger.ac.uk")
 156     current = get_ex_events(ex_account.calendar)
 157
 158     gcal_account = gcal_login()
 159     gcal_tz = get_gcal_timezone(gcal_account)
 160
 161     if cache is not None:
 162         added,deleted,changed = ex_event_changes(cache,current)
 163         add_ex_to_gcal(ex_account,gcal_account,gcal_tz,current,added)
 164
 165     with open(cachepath,"wb") as f:
 166         pickle.dump(current,f)
 167
 168 if __name__ == "__main__":
 169     main()
 170
 171