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 collections
   8 import logging
   9 logger = logging.getLogger('gooswapper')
  10 logger.setLevel(logging.INFO)
  11 consolelog = logging.StreamHandler()
  12 consolelog.setLevel(logging.INFO)
  13 logformatter = logging.Formatter('%(name)s - %(levelname)s - %(message)s')
  14 consolelog.setFormatter(logformatter)
  15 logger.addHandler(consolelog)
  16 #We can't use this, because that way all the libraries' logs spam us
  17 #logging.basicConfig(level=logging.INFO)
  18
  19 #Exchange-related library
  20 sys.path.append("/upstreams/exchangelib")
  21 import exchangelib
  22
  23 #Google calendar-api libraries
  24 import httplib2
  25 import apiclient.discovery
  26 import oauth2client
  27 import oauth2client.file
  28 import oauth2client.client
  29 import googleapiclient.errors
  30
  31 #Not sure what the distribution approach here is...
  32 gcal_client_id = '805127902516-ptbbtgpq9o8pjr6r3k6hsm60j589o85u.apps.googleusercontent.com'
  33 gcal_client_secret = '8hpdxV3MauorryTDoZ1YK8JO'
  34
  35 #scope URL for r/w calendar access
  36 scope = 'https://www.googleapis.com/auth/calendar'
  37 #flow object, for doing OAuth2.0 stuff
  38 flow = oauth2client.client.OAuth2WebServerFlow(gcal_client_id,
  39                                                gcal_client_secret,
  40                                                scope)
  41
  42
  43 gcal_authpath=".gooswap_gcal_creds.dat"
  44
  45 cachepath=".gooswapcache"
  46
  47 exchange_credential = None
  48
  49 CachedExEvent=collections.namedtuple('CachedExEvent',
  50                                      ['changekey','gcal_link'])
  51
  52 class ex_gcal_link(exchangelib.ExtendedProperty):
  53     distinguished_property_set_id = 'PublicStrings'
  54     property_name = "google calendar event id"
  55     property_type = 'String'
  56
  57 exchangelib.CalendarItem.register('gcal_link',ex_gcal_link)
  58
  59 #useful if you want to replay an event
  60 def drop_from_ex_cache(itemid):
  61     with open(cachepath,"rb") as f:
  62         cache = pickle.load(f)
  63     cache.pop(itemid)
  64     with open(cachepath,"wb") as f:
  65         pickle.dump(cache,f)
  66
  67 def get_ex_event_by_itemid(calendar,itemid):
  68     return calendar.get(item_id=itemid)
  69
  70 def get_ex_event_by_id_and_changekey(acct,itemid,changekey):
  71     l=list(acct.fetch([(itemid,changekey)]))
  72     return list(acct.fetch([(itemid,changekey)]))[0]
  73
  74 def get_ex_cred(username="SANGER\mv3",password=None):
  75     if password is None:
  76         password = getpass.getpass(prompt="Password for user %s: " % username)
  77     return exchangelib.ServiceAccount(username,password)
  78
  79 def ex_login(emailaddr,ad_cache_path=None):
  80     global exchange_credential
  81     autodiscover = True
  82     if exchange_credential is None:
  83         exchange_credential = get_ex_cred()
  84     if ad_cache_path is not None:
  85         try:
  86             with open(ad_cache_path,"rb") as f:
  87                 url,auth_type = pickle.load(f)
  88                 autodiscover = False
  89         except FileNotFoundError:
  90             pass
  91
  92     if autodiscover:
  93         ex_ac = exchangelib.Account(emailaddr,
  94                                     credentials = exchange_credential,
  95                                     autodiscover = autodiscover)
  96         if ad_cache_path is not None:
  97             cache=(ex_ac.protocol.service_endpoint,
  98                    ex_ac.protocol.auth_type)
  99             with open(ad_cache_path,"wb") as f:
 100                 pickle.dump(cache,f)
 101     else:
 102         ex_conf = exchangelib.Configuration(service_endpoint=url,
 103                                             credentials=exchange_credential,
 104                                             auth_type=auth_type)
 105         ex_ac = exchangelib.Account(emailaddr,
 106                                     config=ex_conf,
 107                                     autodiscover=False,
 108                                     access_type=exchangelib.DELEGATE)
 109
 110     return ex_ac
 111
 112 def get_ex_events(calendar):
 113     ans={}
 114     for event in calendar.all().only('changekey','item_id','gcal_link'):
 115         if event.item_id in ans:
 116             logger.warning("Event item_id %s was duplicated!" % event.item_id)
 117         ans[event.item_id] = CachedExEvent(event.changekey,event.gcal_link)
 118     logger.info("%d events found" % len(ans))
 119     return ans
 120
 121 def ex_event_changes(old,new):
 122     olds = set(old.keys())
 123     news = set(new.keys())
 124     added = list(news-olds)
 125     deleted = list(olds-news)
 126     changed = []
 127     #intersection - i.e. common to both sets
 128     for event in olds & news:
 129         if old[event].changekey != new[event].changekey:
 130             changed.append(event)
 131     logger.info("%d events updated, %d added, %d deleted" % (len(changed),
 132                                                               len(added),
 133                                                               len(deleted)))
 134     return added, deleted, changed
 135
 136 def rrule_from_ex(event,gcal_tz):
 137     if event.type != "RecurringMaster":
 138         logger.error("Cannot make recurrence from not-recurring event")
 139         return None
 140     if event.recurrence is None:
 141         logger.error("Empty recurrence structure")
 142         return None
 143     if isinstance(event.recurrence.pattern,
 144                   exchangelib.recurrence.DailyPattern):
 145         rr = "RRULE:FREQ=DAILY;INTERVAL=%d" % event.recurrence.pattern.interval
 146     else:
 147         logger.error("Recurrence %s not supported" % event.recurrence)
 148         return None
 149     if isinstance(event.recurrence.boundary,
 150                   exchangelib.recurrence.EndDatePattern):
 151         rr += ";UNTIL={0:%Y}{0:%m}{0:%d}".format(event.recurrence.boundary.end)
 152     else:
 153         logger.error("Recurrence %s not supported" % event.recurrence)
 154         return None
 155     if event.modified_occurrences is not None or \
 156        event.deleted_occurrences is not None:
 157         logger.warning("Modified/Deleted recurrences not supported")
 158     return [rr]
 159
 160 def build_gcal_event_from_ex(event,gcal_tz):
 161     gevent={}
 162     gevent["summary"]=event.subject
 163     if event.is_all_day:
 164         gevent["end"]={"date": str(event.end.astimezone(gcal_tz).date())}
 165         gevent["start"]={"date": str(event.start.astimezone(gcal_tz).date())}
 166     else:
 167         gevent["end"]={"dateTime": event.end.astimezone(gcal_tz).isoformat(),
 168                        "timeZone": str(gcal_tz)}
 169         gevent["start"]={"dateTime": event.start.astimezone(gcal_tz).isoformat(),
 170                          "timeZone": str(gcal_tz)}
 171     if event.text_body is not None and event.text_body.strip() != '':
 172         gevent["description"] = event.text_body
 173     if event.location is not None:
 174         gevent["location"] = event.location
 175     gevent["extendedProperties"]={"shared": {"ex_id": event.item_id}}
 176     return gevent
 177
 178 def add_ex_to_gcal(ex_acct,
 179                    gcal_acct,gcal_tz,events,
 180                    added,
 181                    gcal_id="primary"):
 182     for ev_id in added:
 183         event = get_ex_event_by_itemid(ex_acct.calendar,ev_id)
 184         gevent = build_gcal_event_from_ex(event,gcal_tz)
 185         if event.type=="RecurringMaster":
 186             rr = rrule_from_ex(event,gcal_tz)
 187             if rr is not None:
 188                 gevent["recurrence"] = rr
 189                 print(gevent)
 190             else:
 191                 logger.warning("Unable to set recurrence")
 192         gevent = gcal_acct.events().insert(calendarId=gcal_id,
 193                                            body=gevent).execute()
 194         event.gcal_link = gevent.get("id")
 195         event.save(update_fields=["gcal_link"])
 196         events[event.item_id] = events[event.item_id]._replace(changekey=event.changekey,gcal_link=event.gcal_link)
 197
 198 def del_ex_to_gcal(ex_acct, gcal_acct, events, deleted, gcal_id="primary"):
 199     for ev_id in deleted:
 200         if events[ev_id].gcal_link is not None:
 201             gcal_acct.events().delete(calendarId=gcal_id,
 202                                       eventId=events[ev_id].gcal_link,
 203                                       sendUpdates="none").execute()
 204
 205 def update_ex_to_gcal(ex_acct,
 206                       gcal_acct,gcal_tz,
 207                       events,changed,
 208                       gcal_id="primary"):
 209     for ev_id in changed:
 210         event = get_ex_event_by_itemid(ex_acct.calendar,ev_id)
 211         if not event.is_recurring:
 212             gevent = build_gcal_event_from_ex(event,gcal_tz)
 213             gevent = gcal_acct.events().update(calendarId=gcal_id,
 214                                                eventId=event.gcal_link,
 215                                                body=gevent,
 216                                                sendUpdates="none").execute()
 217         else:
 218             logger.warning("recurring events not yet supported")
 219
 220 def match_ex_to_gcal(ex_acct,gcal_acct,gcal_tz,events,gcal_id="primary"):
 221     recur = 0
 222     matched = 0
 223     skipped = 0
 224     for ev_id in events:
 225         event = get_ex_event_by_itemid(ex_acct.calendar,ev_id)
 226         if event.is_recurring:
 227             recur += 1
 228             continue
 229         elif event.gcal_link is not None:
 230             skipped += 1
 231             continue
 232         matches = gcal_acct.events().list(calendarId=gcal_id,
 233                                           timeMin=event.start.isoformat(),
 234                                           timeMax=event.end.isoformat()).execute()
 235         for ge in matches['items']:
 236             if ge['summary'].strip()==event.subject.strip():
 237                 logger.info("Matching '%s' starting at %s" % (event.subject,
 238                                                               event.start.isoformat()))
 239                 event.gcal_link = ge['id']
 240                 event.save(update_fields=["gcal_link"])
 241                 events[event.item_id] = events[event.item_id]._replace(changekey=event.changekey,gcal_link=event.gcal_link)
 242                 gevent = {}
 243                 gevent["start"] = ge["start"]
 244                 gevent["end"] = ge["end"]
 245                 gevent["extendedProperties"]={"shared": {"ex_id": event.item_id}}
 246                 try:
 247                     gcal_acct.events().update(calendarId=gcal_id,
 248                                               eventId=event.gcal_link,
 249                                               body=gevent,
 250                                               sendUpdates="none").execute()
 251                 #this may fail if we don't own the event
 252                 except googleapiclient.errors.HttpError as err:
 253                     if err.resp.status == 403:
 254                         pass
 255                 matched += 1
 256                 break
 257     logger.info("Matched %d events, skipped %d with existing link, and %d recurring ones" % (matched,skipped,recur))
 258
 259 def get_gcal_cred():
 260     #each such file can only store a single credential
 261     storage = oauth2client.file.Storage(gcal_authpath)
 262     gcal_credential = storage.get()
 263     #if no credential found, or they're invalid (e.g. expired),
 264     #then get a new one; pass --noauth_local_webserver on the command line
 265     #if you don't want it to spawn a browser
 266     if gcal_credential is None or gcal_credential.invalid:
 267         gcal_credential = oauth2client.tools.run_flow(flow,
 268                                                       storage,
 269                                                       oauth2client.tools.argparser.parse_args())
 270     return gcal_credential
 271
 272 def gcal_login():
 273     gcal_credential = get_gcal_cred()
 274     # Object to handle http requests; could add proxy details
 275     http = httplib2.Http()
 276     http = gcal_credential.authorize(http)
 277     return apiclient.discovery.build('calendar', 'v3', http=http)
 278
 279 def get_gcal_timezone(gcal_account,calendarid="primary"):
 280     gcal = gcal_account.calendars().get(calendarId=calendarid).execute()
 281     return exchangelib.EWSTimeZone.timezone(gcal['timeZone'])
 282
 283 def main():
 284     try:
 285         with open(cachepath,"rb") as f:
 286             cache = pickle.load(f)
 287     except FileNotFoundError:
 288         cache = None
 289
 290     ex_account = ex_login("mv3@sanger.ac.uk",".gooswapper_exch_conf.dat")
 291     current = get_ex_events(ex_account.calendar)
 292
 293     gcal_account = gcal_login()
 294     gcal_tz = get_gcal_timezone(gcal_account)
 295
 296     if cache is not None:
 297         added,deleted,changed = ex_event_changes(cache,current)
 298         add_ex_to_gcal(ex_account,gcal_account,gcal_tz,current,added)
 299         #delete op needs the "cache" set, as that has the link ids in
 300         #for events that are now deleted
 301         del_ex_to_gcal(ex_account,gcal_account,cache,deleted)
 302         update_ex_to_gcal(ex_account,gcal_account,gcal_tz,current,changed)
 303     else:
 304         match_ex_to_gcal(ex_account,gcal_account,gcal_tz,current)
 305
 306     with open(cachepath,"wb") as f:
 307         pickle.dump(current,f)
 308
 309 if __name__ == "__main__":
 310     main()
 311
 312