def validate(access_token):
"""Validate a Facebook access token and return the associated local user
ID, creating a new user record if necessary.
"""
user_id = AccessTokenCache.get(access_token)
# If the access token isn't in the cache then validate it with Facebook
# and retrieve its metadata. Extract the user ID from the metadata and
# query Facebook again for the user metadata. If a record for the user
# already exists update it with the latest metadata, otherwise create a new
# record. Finally cache the access token until Facebook expires it.
#
# If new user metadata is being retrieved it may contain a different list
# of friends to those already cached for the user, so clear the user's
# friends cache.
if user_id is None:
access_token_meta = yield FacebookGraphAPI.debug_token(access_token)
fb_user_id = access_token_meta["user_id"]
user_meta = yield FacebookGraphAPI.get_user(fb_user_id, access_token)
user_id = yield \
_create_or_update_user_record(fb_user_id, user_meta, access_token)
FriendsCache.clear(user_id)
AccessTokenCache.put(access_token, user_id,
access_token_meta["expires_at"])
raise tornado.gen.Return(user_id)
def validate(access_token):
"""Validate a Facebook access token and return the associated local user
ID, creating a new user record if necessary.
"""
user_id = AccessTokenCache.get(access_token)
# If the access token isn't in the cache then validate it with Facebook
# and retrieve its metadata. Extract the user ID from the metadata and
# query Facebook again for the user metadata. If a record for the user
# already exists update it with the latest metadata, otherwise create a new
# record. Finally cache the access token until Facebook expires it.
#
# If new user metadata is being retrieved it may contain a different list
# of friends to those already cached for the user, so clear the user's
# friends cache.
if user_id is None:
access_token_meta = yield FacebookGraphAPI.debug_token(access_token)
fb_user_id = access_token_meta["user_id"]
user_meta = yield FacebookGraphAPI.get_user(fb_user_id, access_token)
user_id = yield \
_create_or_update_user_record(fb_user_id, user_meta, access_token)
FriendsCache.clear(user_id)
AccessTokenCache.put(
access_token, user_id, access_token_meta["expires_at"])
raise tornado.gen.Return(user_id)
