Add support for WA7BNM Contest Calendar. Closes #106

providers/alert/wa7bnm.py

@@ -0,0 +1,41 @@
+from icalendar import Event
+
+from core.enums import AlertType
+from data.alert import Alert
+from providers.alert.ical_alert_provider import ICALAlertProvider
+
+
+class WA7BNM(ICALAlertProvider):
+    """Alert provider for the WA7BNM contest calendar."""
+
+    POLL_INTERVAL_DAYS = 1
+    ALERTS_URL = "https://contestcalendar.com/weeklycontcustom.php"
+
+    def __init__(self, provider_config):
+        super().__init__(
+            "WA7BNM Contest Calendar", provider_config, self.ALERTS_URL, self.POLL_INTERVAL_DAYS * 24 * 60 * 60
+        )
+
+    def event_to_alert(self, event: Event) -> Alert:
+        """Convert an iCal event in WA7BNM's format to an Alert object."""
+
+        summary = str(event.get("summary", ""))
+        url = str(event.get("url", ""))
+
+        dtstart = event.get("dtstart")
+        dtend = event.get("dtend")
+        start_timestamp = self._to_utc_timestamp(dtstart.dt)
+        end_timestamp = self._to_utc_timestamp(dtend.dt) - 1 if dtend is not None else start_timestamp
+
+        # Convert to our alert format
+        alert = Alert(
+            source=self.name,
+            dx_calls=[],
+            comment=summary,
+            url=url,
+            start_time=start_timestamp,
+            end_time=end_timestamp,
+            alert_type=AlertType.CONTEST,
+        )
+
+        return alert