typing: Fix function signatures.

This fixes mypy errors for function signatures discovered with
django-stubs.

zerver/filters.py

@@ -1,12 +1,12 @@
 import re
-from typing import Any, Dict
+from typing import Any, Dict, Optional
 
 from django.http import HttpRequest
 from django.views.debug import SafeExceptionReporterFilter
 
 
 class ZulipExceptionReporterFilter(SafeExceptionReporterFilter):
-    def get_post_parameters(self, request: HttpRequest) -> Dict[str, Any]:
+    def get_post_parameters(self, request: Optional[HttpRequest]) -> Dict[str, Any]:
         post_data = SafeExceptionReporterFilter.get_post_parameters(self, request)
         assert isinstance(post_data, dict)
         filtered_post = post_data.copy()

zerver/lib/actions.py

@@ -2924,7 +2924,7 @@ def check_update_message(
     message_id: int,
     stream_id: Optional[int] = None,
     topic_name: Optional[str] = None,
-    propagate_mode: Optional[str] = "change_one",
+    propagate_mode: str = "change_one",
     send_notification_to_old_thread: bool = True,
     send_notification_to_new_thread: bool = True,
     content: Optional[str] = None,

zerver/lib/presence.py

@@ -2,7 +2,7 @@ import datetime
 import itertools
 import time
 from collections import defaultdict
-from typing import Any, Dict, List, Set
+from typing import Any, Dict, Mapping, Sequence, Set
 
 from django.utils.timezone import now as timezone_now
 
@@ -11,7 +11,7 @@ from zerver.models import PushDeviceToken, Realm, UserPresence, UserProfile, que
 
 
 def get_status_dicts_for_rows(
-    all_rows: List[Dict[str, Any]], mobile_user_ids: Set[int], slim_presence: bool
+    all_rows: Sequence[Mapping[str, Any]], mobile_user_ids: Set[int], slim_presence: bool
 ) -> Dict[str, Dict[str, Any]]:
 
     # Note that datetime values have sub-second granularity, which is
@@ -46,7 +46,7 @@ def get_status_dicts_for_rows(
 
 
 def get_modern_user_info(
-    presence_rows: List[Dict[str, Any]], mobile_user_ids: Set[int]
+    presence_rows: Sequence[Mapping[str, Any]], mobile_user_ids: Set[int]
 ) -> Dict[str, Any]:
 
     active_timestamp = None
@@ -76,7 +76,7 @@ def get_modern_user_info(
 
 
 def get_legacy_user_info(
-    presence_rows: List[Dict[str, Any]], mobile_user_ids: Set[int]
+    presence_rows: Sequence[Mapping[str, Any]], mobile_user_ids: Set[int]
 ) -> Dict[str, Any]:
 
     # The format of data here is for legacy users of our API,

zerver/lib/test_runner.py

@@ -297,7 +297,7 @@ class Runner(DiscoverRunner):
         self.shallow_tested_templates: Set[str] = set()
         template_rendered.connect(self.on_template_rendered)
 
-    def get_resultclass(self) -> Type[TestResult]:
+    def get_resultclass(self) -> Optional[Type[TextTestResult]]:
         return TextTestResult
 
     def on_template_rendered(self, sender: Any, context: Dict[str, Any], **kwargs: Any) -> None:

zerver/tests/test_webhooks_common.py

@@ -3,6 +3,7 @@ from typing import Dict
 from unittest.mock import MagicMock, patch
 
 from django.http import HttpRequest
+from django.http.response import HttpResponse
 
 from zerver.decorator import webhook_view
 from zerver.lib.actions import do_rename_stream
@@ -61,11 +62,11 @@ class WebhooksCommonTestCase(ZulipTestCase):
 
     def test_notify_bot_owner_on_invalid_json(self) -> None:
         @webhook_view("ClientName", notify_bot_owner_on_invalid_json=False)
-        def my_webhook_no_notify(request: HttpRequest, user_profile: UserProfile) -> None:
+        def my_webhook_no_notify(request: HttpRequest, user_profile: UserProfile) -> HttpResponse:
             raise InvalidJSONError("Malformed JSON")
 
         @webhook_view("ClientName", notify_bot_owner_on_invalid_json=True)
-        def my_webhook_notify(request: HttpRequest, user_profile: UserProfile) -> None:
+        def my_webhook_notify(request: HttpRequest, user_profile: UserProfile) -> HttpResponse:
             raise InvalidJSONError("Malformed JSON")
 
         webhook_bot_email = "webhook-bot@zulip.com"

zerver/views/message_edit.py

@@ -98,7 +98,7 @@ def update_message_backend(
     message_id: int = REQ(converter=to_non_negative_int, path_only=True),
     stream_id: Optional[int] = REQ(converter=to_non_negative_int, default=None),
     topic_name: Optional[str] = REQ_topic(),
-    propagate_mode: Optional[str] = REQ(
+    propagate_mode: str = REQ(
         default="change_one", str_validator=check_string_in(PROPAGATE_MODE_VALUES)
     ),
     send_notification_to_old_thread: bool = REQ(default=True, json_validator=check_bool),

zerver/webhooks/slack/view.py

@@ -1,4 +1,5 @@
 from django.http import HttpRequest
+from django.http.response import HttpResponse
 from django.utils.translation import gettext as _
 
 from zerver.decorator import webhook_view
@@ -22,7 +23,7 @@ def api_slack_webhook(
     channel_name: str = REQ(),
     stream: str = REQ(default="slack"),
     channels_map_to_topics: str = REQ(default="1"),
-) -> HttpRequest:
+) -> HttpResponse:
 
     if channels_map_to_topics not in list(VALID_OPTIONS.values()):
         raise JsonableError(_("Error: channels_map_to_topics parameter other than 0 or 1"))