feat: Add ADM support

Closes #1275

autopush/config.py

@@ -258,7 +258,6 @@ def from_argparse(cls, ns, **kwargs):
                                   "max_data": ns.max_data,
                                   "collapsekey": ns.gcm_collapsekey,
                                   "senderIDs": sender_ids}
-
         client_certs = None
         # endpoint only
         if getattr(ns, 'client_certs', None):
@@ -296,6 +295,14 @@ def from_argparse(cls, ns, **kwargs):
                                   "auth": ns.fcm_auth,
                                   "senderid": ns.fcm_senderid}
 
+        if ns.adm_creds:
+            # Create a common admclient
+            try:
+                router_conf["adm"] = json.loads(ns.adm_creds)
+            except (ValueError, TypeError):
+                raise InvalidConfig(
+                    "Invalid JSON specified for ADM config options")
+
         ami_id = None
         # Not a fan of double negatives, but this makes more
         # understandable args

autopush/main_argparse.py

@@ -189,6 +189,12 @@ def _add_external_router_args(parser):
                                              "APNS settings",
                         type=str, default="",
                         env_var="APNS_CREDS")
+    # Amazon Device Messaging client credentials
+    parser.add_argument('--adm_creds', help="JSON dictionary of "
+                                            "Amazon Device Message "
+                                            "credentials",
+                        type=str, default="",
+                        env_var="ADM_CREDS")
 
 
 def parse_connection(config_files, args):

autopush/router/__init__.py

@@ -15,8 +15,10 @@
 from autopush.router.interface import IRouter  # noqa
 from autopush.router.webpush import WebPushRouter
 from autopush.router.fcm import FCMRouter
+from autopush.router.adm import ADMRouter
 
-__all__ = ["APNSRouter", "FCMRouter", "GCMRouter", "WebPushRouter"]
+__all__ = ["APNSRouter", "FCMRouter", "GCMRouter", "WebPushRouter",
+           "ADMRouter"]
 
 
 def routers_from_config(conf, db, agent):
@@ -30,4 +32,6 @@ def routers_from_config(conf, db, agent):
         routers["apns"] = APNSRouter(conf, router_conf["apns"], db.metrics)
     if 'gcm' in router_conf:
         routers["gcm"] = GCMRouter(conf, router_conf["gcm"], db.metrics)
+    if 'adm' in router_conf:
+        routers["adm"] = ADMRouter(conf, router_conf["adm"], db.metrics)
     return routers

autopush/router/adm.py

@@ -0,0 +1,206 @@
+"""ADM Router"""
+import time
+import requests
+
+from typing import Any  # noqa
+
+from requests.exceptions import ConnectionError
+from twisted.internet.threads import deferToThread
+from twisted.logger import Logger
+
+from autopush.exceptions import RouterException
+from autopush.metrics import make_tags
+from autopush.router.interface import RouterResponse
+from autopush.types import JSONDict  # noqa
+
+
+class ADMAuthError(Exception):
+    pass
+
+
+class ADMClient(object):
+    def __init__(self,
+                 credentials=None,
+                 logger=None,
+                 metrics=None,
+                 endpoint="api.amazon.com",
+                 **options
+                 ):
+
+        self._client_id = credentials["client_id"]
+        self._client_secret = credentials["client_secret"]
+        self._token_exp = 0
+        self._auth_token = None
+        self._aws_host = endpoint
+        self._logger = logger
+        self._metrics = metrics
+        self._request = requests
+
+    def refresh_key(self):
+        url = "https://{}/auth/O2/token".format(self._aws_host)
+        if self._auth_token is None or self._token_exp < time.time():
+            body = dict(
+                grant_type="client_credentials",
+                scope="messaging:push",
+                client_id=self._client_id,
+                client_secret=self._client_secret
+            )
+            headers = {
+                "content-type": "application/x-www-form-urlencoded"
+            }
+            resp = self._request.post(url, data=body, headers=headers)
+            if resp.status_code != 200:
+                self._logger.error("Could not get ADM Auth token {}".format(
+                    resp.text
+                ))
+                raise ADMAuthError("Could not fetch auth token")
+            reply = resp.json()
+            self._auth_token = reply['access_token']
+            self._token_exp = time.time() + reply.get('expires_in', 0)
+
+    def send(self, reg_id, payload, ttl=None, collapseKey=None):
+        self.refresh_key()
+        headers = {
+            "Authorization": "Bearer {}".format(self._auth_token),
+            "Content-Type": "application/json",
+            "X-Amzn-Type-Version":
+                "[email protected]",
+            "X-Amzn-Accept-Type":
+                "[email protected]",
+            "Accept": "application/json",
+        }
+        data = {}
+        if ttl:
+            data["expiresAfter"] = ttl
+        if collapseKey:
+            data["consolidationKey"] = collapseKey
+        data["data"] = payload
+        url = ("https://api.amazon.com/messaging/registrations"
+               "/{}/messages".format(reg_id))
+        resp = self._request.post(
+            url,
+            json=data,
+            headers=headers
+        )
+        # in fine tradition, the response message can sometimes be less than
+        # helpful. Still, good idea to include it anyway.
+        if resp.status_code != 200:
+            self._logger.error("Could not send ADM message: " + resp.text)
+            raise RouterException(resp.content)
+
+
+class ADMRouter(object):
+    """Amazon Device Messaging Router Implementation"""
+    log = Logger()
+    dryRun = 0
+    collapseKey = None
+    MAX_TTL = 2419200
+
+    def __init__(self, conf, router_conf, metrics):
+        """Create a new ADM router and connect to ADM"""
+        self.conf = conf
+        self.router_conf = router_conf
+        self.metrics = metrics
+        self.min_ttl = router_conf.get("ttl", 60)
+        self.collapseKey = router_conf.get("collapseKey")
+        self.profiles = dict()
+        for profile in router_conf:
+            config = router_conf[profile]
+            if "client_id" not in config or "client_secret" not in config:
+                raise IOError("Profile info incomplete, missing id or secret")
+            self.profiles[profile] = ADMClient(
+                credentials=config,
+                logger=self.log,
+                metrics=self.metrics)
+        self._base_tags = ["platform:adm"]
+        self.log.debug("Starting ADM router...")
+
+    def amend_endpoint_response(self, response, router_data):
+        # type: (JSONDict, JSONDict) -> None
+        pass
+
+    def register(self, uaid, router_data, app_id, *args, **kwargs):
+        # type: (str, JSONDict, str, *Any, **Any) -> None
+        """Validate that the ADM Registration ID is in the ``router_data``"""
+        if "token" not in router_data:
+            raise self._error("connect info missing ADM Instance 'token'",
+                              status=401)
+        profile_id = app_id
+        if profile_id not in self.profiles:
+            raise self._error("Invalid ADM Profile",
+                              status=410, errno=105,
+                              uri=kwargs.get('uri'),
+                              profile_id=profile_id)
+        # Assign a profile
+        router_data["creds"] = {"profile": profile_id}
+
+    def route_notification(self, notification, uaid_data):
+        """Start the ADM notification routing, returns a deferred"""
+        # Kick the entire notification routing off to a thread
+        return deferToThread(self._route, notification, uaid_data)
+
+    def _route(self, notification, uaid_data):
+        """Blocking ADM call to route the notification"""
+        router_data = uaid_data["router_data"]
+        # THIS MUST MATCH THE CHANNELID GENERATED BY THE REGISTRATION SERVICE
+        # Currently this value is in hex form.
+        data = {"chid": notification.channel_id.hex}
+        # Payload data is optional. The endpoint handler validates that the
+        # correct encryption headers are included with the data.
+        if notification.data:
+            data['body'] = notification.data
+            data['con'] = notification.headers['encoding']
+
+            if 'encryption' in notification.headers:
+                data['enc'] = notification.headers.get('encryption')
+            if 'crypto_key' in notification.headers:
+                data['cryptokey'] = notification.headers['crypto_key']
+
+        # registration_ids are the ADM instance tokens (specified during
+        # registration.
+        ttl = min(self.MAX_TTL,
+                  max(notification.ttl or 0, self.min_ttl))
+
+        try:
+            adm = self.profiles[router_data['creds']['profile']]
+            adm.send(
+                reg_id=router_data.get("token"),
+                payload=data,
+                collapseKey=self.collapseKey,
+                ttl=ttl
+            )
+        except RouterException:
+            raise  # pragma nocover
+        except ConnectionError as e:
+            self.log.warn("ADM Unavailable: %s" % e)
+            self.metrics.increment("notification.bridge.error",
+                                   tags=make_tags(
+                                       self._base_tags,
+                                       reason="connection_unavailable"))
+            raise RouterException("Server error", status_code=502,
+                                  errno=902,
+                                  log_exception=False)
+        except ADMAuthError as e:
+            self.log.error("ADM unable to authorize: %s" % e)
+            self.metrics.increment("notification.bridge.error",
+                                   tags=make_tags(
+                                       self._base_tags,
+                                       reason="auth failure"
+                                   ))
+            raise RouterException("Server error", status_code=500,
+                                  errno=902,
+                                  log_exception=False)
+        except Exception as e:
+            self.log.error("Unhandled exception in ADM Routing: %s" % e)
+            raise RouterException("Server error", status_code=500)
+        location = "%s/m/%s" % (self.conf.endpoint_url, notification.version)
+        return RouterResponse(status_code=201, response_body="",
+                              headers={"TTL": ttl,
+                                       "Location": location},
+                              logged_status=200)
+
+    def _error(self, err, status, **kwargs):
+        """Error handler that raises the RouterException"""
+        self.log.debug(err, **kwargs)
+        return RouterException(err, status_code=status, response_body=err,
+                               **kwargs)