Add _util.now, fixing a few places where datetimes were incorrectly used

fbchat/_client.py

@@ -419,7 +419,7 @@ class Client:
         Warning:
             This is not finished, and the API may change at any point!
         """
-        at = datetime.datetime.utcnow()
+        at = _util.now()
         form = {
             "folders[0]": "inbox",
             "client": "mercury",

fbchat/_session.py

@@ -486,7 +486,7 @@ class Session:
         return self._post("/api/graphqlbatch/", data, as_graphql=True)
 
     def _do_send_request(self, data):
-        now = datetime.datetime.utcnow()
+        now = _util.now()
         offline_threading_id = _util.generate_offline_threading_id()
         data["client"] = "mercury"
         data["author"] = "fbid:{}".format(self._user_id)

fbchat/_util.py

@@ -56,7 +56,7 @@ def parse_json(text: str) -> Any:
 
 
 def generate_offline_threading_id():
-    ret = datetime_to_millis(datetime.datetime.utcnow())
+    ret = datetime_to_millis(now())
     value = int(random.random() * 4294967295)
     string = ("0000000000000000000000" + format(value, "b"))[-22:]
     msgs = format(ret, "b") + string
@@ -158,3 +158,11 @@ def timedelta_to_seconds(td: datetime.timedelta) -> int:
     The returned seconds will be rounded to the nearest whole number.
     """
     return round(td.total_seconds())
+
+
+def now() -> datetime.datetime:
+    """The current time.
+
+    Similar to datetime.datetime.now(), but returns a non-naive datetime.
+    """
+    return datetime.datetime.now(tz=datetime.timezone.utc)

tests/online/test_client.py

@@ -1,6 +1,5 @@
 import pytest
 import fbchat
-import datetime
 import os
 
 pytestmark = pytest.mark.online
@@ -95,11 +94,11 @@ def test_upload_many(client, open_resource):
 
 
 def test_mark_as_read(client, user, group):
-    client.mark_as_read([user, group], datetime.datetime.now())
+    client.mark_as_read([user, group], fbchat._util.now())
 
 
 def test_mark_as_unread(client, user, group):
-    client.mark_as_unread([user, group], datetime.datetime.now())
+    client.mark_as_unread([user, group], fbchat._util.now())
 
 
 def test_move_threads(client, user, group):

tests/test_session.py

@@ -1,6 +1,6 @@
 import datetime
 import pytest
-from fbchat import ParseError
+from fbchat import ParseError, _util
 from fbchat._session import (
     parse_server_js_define,
     base36encode,
@@ -73,7 +73,7 @@ def test_prefix_url():
 
 def test_generate_message_id():
     # Returns random output, so hard to test more thoroughly
-    assert generate_message_id(datetime.datetime.utcnow(), "def")
+    assert generate_message_id(_util.now(), "def")
 
 
 def test_session_factory():

tests/test_util.py

@@ -15,6 +15,7 @@ from fbchat._util import (
     seconds_to_timedelta,
     millis_to_timedelta,
     timedelta_to_seconds,
+    now,
 )
 
 
@@ -245,3 +246,7 @@ def test_timedelta_to_seconds():
     assert timedelta_to_seconds(datetime.timedelta(seconds=1)) == 1
     assert timedelta_to_seconds(datetime.timedelta(hours=1)) == 3600
     assert timedelta_to_seconds(datetime.timedelta(days=1)) == 86400
+
+
+def test_now():
+    assert datetime_to_millis(now()) == datetime_to_millis(datetime.datetime.now())