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diff --git a/pushserver/pns/firebase.py b/pushserver/pns/firebase.py
index 2c7ca7e..f092ea6 100644
--- a/pushserver/pns/firebase.py
+++ b/pushserver/pns/firebase.py
@@ -1,351 +1,351 @@
import json
import os
import time
from datetime import datetime
import oauth2client
import requests
from oauth2client.service_account import ServiceAccountCredentials
from pushserver.models.requests import WakeUpRequest
from requests.adapters import HTTPAdapter
from urllib3 import Retry
from pushserver.pns.base import PNS, PushRequest, PlatformRegister
from pushserver.resources.utils import log_event, fix_non_serializable_types
class FirebasePNS(PNS):
"""
A Firebase Push Notification service
"""
def __init__(self, app_id: str, app_name: str, url_push: str,
voip: bool, auth_key: str = None, auth_file: str = None):
"""
:param app_id `str`: Application ID.
:param url_push `str`: URI to push a notification.
:param voip `bool`: required for apple, `True` for voip push notification type.
:param auth_key `str`: A Firebase credential for push notifications.
:param auth_file `str`: A Firebase credential for push notifications.
"""
self.app_id = app_id
self.app_name = app_name
self.url_push = url_push
self.voip = voip
self.auth_key = auth_key
self.auth_file = auth_file
self.error = ''
self.last_update_token = None
self.access_token = self.set_access_token()
def set_access_token(self) -> str:
"""
Retrieve a valid access token that can be used to authorize requests.
:return: `str` Access token.
"""
if not self.auth_file:
self.error = f"Cannot generated Firebase access token, " \
f"no auth file provided"
return ''
if not os.path.exists(self.auth_file):
self.error = f"Cannot generated Firebase access token, " \
f"auth file {self.auth_file} not found"
return ''
scopes = ['https://www.googleapis.com/auth/firebase.messaging']
try:
credentials = ServiceAccountCredentials.from_json_keyfile_name(self.auth_file,
scopes)
oauth2client.client.logger.setLevel('CRITICAL')
access_token_info = credentials.get_access_token()
self.last_update_token = datetime.now()
return access_token_info.access_token
except Exception as e:
self.error = f"Error: cannot generated Firebase access token: {e}"
return ''
class FirebaseRegister(PlatformRegister):
def __init__(self, app_id: str, app_name: str, voip: bool,
config_dict: dict, credentials_path: str, loggers: dict):
self.app_id = app_id
self.app_name = app_name
self.voip = voip
self.credentials_path = credentials_path
self.config_dict = config_dict
self.loggers = loggers
self.error = ''
self.auth_key, self.auth_file = self.set_auths()
@property
def url_push(self):
try:
return self.config_dict['firebase_push_url']
except KeyError:
self.error = 'firebase_push_url not found in applications.ini'
return None
def set_auths(self):
auth_key = None
auth_file = None
try:
auth_key = self.config_dict['firebase_authorization_key']
except KeyError:
try:
auth_file = self.config_dict['firebase_authorization_file']
if self.credentials_path:
auth_file = f"{self.credentials_path}/" \
f"{auth_file}"
else:
pass
if not os.path.exists(auth_file):
self.error = f'{auth_file} - no such file'
except KeyError:
self.error = 'not firebase_authorization_key or ' \
'firebase_authorization_file found in applications.ini'
return auth_key, auth_file
@property
def pns(self) -> FirebasePNS:
pns = None
if self.auth_key:
auth_file = ''
pns = FirebasePNS(app_id=self.app_id,
app_name=self.app_name,
url_push=self.url_push,
voip=self.voip,
auth_key=self.auth_key,
auth_file=auth_file)
elif self.auth_file:
pns = FirebasePNS(app_id=self.app_id,
app_name=self.app_name,
url_push=self.url_push,
voip=self.voip,
auth_file=self.auth_file)
self.error = pns.error if pns.error else ''
return pns
@property
def register_entries(self):
if self.error:
return {}
return {'pns': self.pns,
'access_token': self.pns.access_token,
'auth_key': self.auth_key,
'auth_file': self.auth_file}
class FirebasePushRequest(PushRequest):
"""
Firebase push notification request
"""
def __init__(self, error: str, app_name: str, app_id: str,
request_id: str, headers: str, payload: dict,
loggers: dict, log_remote: dict,
wp_request: WakeUpRequest, register: dict):
"""
:param error: `str`
:param app_name: `str` 'linphone' or 'payload'
:param app_id: `str` bundle id
:param headers: `AppleHeaders` Apple push notification headers
:param payload: `ApplePayload` Apple push notification payload
:param wp_request: `WakeUpRequest`
:param loggers: `dict` global logging instances to write messages (params.loggers)
"""
self.error = error
self.app_name = app_name
self.app_id = app_id
self.platform = 'firebase'
self.request_id = request_id
self.headers = headers
self.payload = payload
self.token = wp_request.token
self.wp_request = wp_request
self.loggers = loggers
self.log_remote = log_remote
self.pns = register['pns']
self.path = self.pns.url_push
self.results = self.send_notification()
def requests_retry_session(self, counter=0):
"""
Define parameters to retry a push notification
according to media_type.
:param counter: `int` (optional) if retries was necessary
because of connection fails
Following rfc3261 specification, an exponential backoff factor is used.
More specifically:
backoff = 0.5
T1 = 500ms
max_retries_call = 7
time_to_live_call = 64 seconds
max_retries_sms = 11
time_to_live_sms ~ 2 hours
"""
retries = self.retries_params[self.media_type] - counter
backoff_factor = self.retries_params['bo_factor'] * 0.5 * 2 ** counter
status_forcelist = tuple([status for status in range(500, 600)])
session = None
session = session or requests.Session()
retry = Retry(
total=retries,
read=retries,
connect=retries,
backoff_factor=backoff_factor,
status_forcelist=status_forcelist)
adapter = HTTPAdapter(max_retries=retry)
session.mount('http://', adapter)
session.mount('https://', adapter)
return session
def send_notification(self) -> dict:
"""
Send a Firebase push notification
"""
if self.error:
self.log_error()
return {'code': 500, 'body': {}, 'reason': 'Internal server error'}
n_retries, backoff_factor = self.retries_params(self.wp_request.media_type)
counter = 0
error = False
code = 500
reason = ""
body = None
response = None
while counter <= n_retries:
self.log_request(path=self.pns.url_push)
try:
response = requests.post(self.pns.url_push,
self.payload,
headers=self.headers)
break
except requests.exceptions.RequestException as e:
error = True
reason = f'connection failed: {e}'
counter += 1
timer = backoff_factor * (2 ** (counter - 1))
time.sleep(timer)
if counter == n_retries:
reason = "maximum retries reached"
elif error:
try:
response = self.requests_retry_session(counter). \
post(self.pns.url_push,
self.payload,
headers=self.headers)
except Exception as x:
level = 'error'
msg = f"outgoing {self.platform.title()} response for " \
f"{self.request_id}, push failed: " \
f"an error occurred in {x.__class__.__name__}"
log_event(loggers=self.loggers, msg=msg, level=level)
try:
body = response.__dict__
except (TypeError, ValueError):
code = 500
reason = 'cannot parse response body'
body = {}
else:
reason = body.get('reason')
code = response.status_code
for k in ('raw', 'request', 'connection', 'cookies', 'elapsed'):
try:
del body[k]
except KeyError:
pass
except TypeError:
break
body = json.dumps(fix_non_serializable_types(body))
if isinstance(body, str):
body = json.loads(body)
if code == 200:
try:
- failure = body['data']['body']['_content']['failure']
+ failure = body['_content']['failure']
except KeyError:
pass
else:
if failure == 1:
- reason = body['data']['body']['_content']['results'][0]['error']
+ reason = body['_content']['results'][0]['error']
code = 410
elif code == 404:
try:
- payload_code = body['data']['body']['_content']['error']['code']
+ payload_code = body['_content']['error']['code']
except KeyError:
pass
else:
if payload_code == 404:
code = 410
keys = list(body.keys())
for key in keys:
if not body[key]:
del body[key]
results = {'body': body,
'code': code,
'reason': reason,
'url': self.pns.url_push,
'call_id': self.wp_request.call_id,
'token': self.token
}
self.results = results
self.log_results()
# Request is missing required authentication credential.
# Expected OAuth 2 access token, login cookie or other valid authentication
# credential. UNAUTHENTICATED
code = results.get('code')
reason = results.get('reason')
if code == 401 and reason == 'Unauthorized':
delta = datetime.now() - self.pns.last_update_token
if delta.total_seconds() > 300: # 5 min
level = 'warn'
msg = f"outgoing {self.platform.title()} response for request " \
f"{self.request_id} need a new access token - " \
f"server will refresh it and try again"
log_event(loggers=self.loggers, msg=msg, level=level, to_file=True)
# retry with a new Fireplace access token
self.pns.access_token = self.pns.set_access_token()
level = 'warn'
msg = f"outgoing {self.platform.title()} response for request " \
f"{self.request_id} a new access token was generated - " \
f"trying again"
log_event(loggers=self.loggers, msg=msg, level=level, to_file=True)
self.results = self.send_notification()
return results

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