circleci: Support the "ping" event type.

zerver/webhooks/circleci/fixtures/ping.json

@@ -0,0 +1,9 @@
+{
+    "happened_at": "2023-06-17T19:50:27.457981Z",
+    "id": "d1264809-3541-48db-9d72-68f04f074877",
+    "type": "ping",
+    "webhook": {
+        "id": "87f2e824-39f9-4fa8-985e-ce1a0571ad93",
+        "name": "Testing"
+    }
+}

zerver/webhooks/circleci/tests.py

@@ -6,6 +6,11 @@ class CircleCiHookTests(WebhookTestCase):
     URL_TEMPLATE = "/api/v1/external/circleci?stream={stream}&api_key={api_key}"
     WEBHOOK_DIR_NAME = "circleci"
 
+    def test_ping(self) -> None:
+        expected_topic = "Test event"
+        expected_message = "Webhook 'Testing' test event successful."
+        self.check_webhook("ping", expected_topic, expected_message)
+
     def test_bitbucket_job_completed(self) -> None:
         expected_topic = "circleci-webhook-testing"
         expected_message = """

zerver/webhooks/circleci/view.py

@@ -54,7 +54,7 @@ Job `{job_name}` within Pipeline #{pipeline_number} {formatted_status}.
 {commit_details}
 """
 
-ALL_EVENT_TYPES = ["job-completed", "workflow-completed"]
+ALL_EVENT_TYPES = ["ping", "job-completed", "workflow-completed"]
 
 
 @webhook_view("CircleCI", all_event_types=ALL_EVENT_TYPES)
@@ -64,17 +64,24 @@ def api_circleci_webhook(
     user_profile: UserProfile,
     payload: WildValue = REQ(argument_type="body", converter=to_wild_value),
 ) -> HttpResponse:
-    subject = get_subject(payload)
-    body = get_body(payload)
+    type = payload["type"].tame(check_string)
+    if type == "ping":
+        # Ping events don't have full payloads, so our normal codepath won't work
+        subject = "Test event"
+        body = "Webhook '{name}' test event successful.".format(
+            name=payload["webhook"]["name"].tame(check_string)
+        )
+    else:
+        subject = get_subject(payload)
+        body = get_body(payload)
 
-    pipeline = payload["pipeline"]
-
-    # We currently don't support projects using VCS providers other than GitHub,
-    # BitBucket and GitLab.
-    if "trigger_parameters" in pipeline and pipeline["trigger"]["type"] != "gitlab":
-        raise JsonableError(
-            _("Projects using this version control system provider aren't supported")
-        )  # nocoverage
+        # We currently don't support projects using VCS providers other than GitHub,
+        # BitBucket and GitLab.
+        pipeline = payload["pipeline"]
+        if "trigger_parameters" in pipeline and pipeline["trigger"]["type"] != "gitlab":
+            raise JsonableError(
+                _("Projects using this version control system provider aren't supported")
+            )  # nocoverage
 
     check_send_webhook_message(
         request,