fix(Alerts/Reports): allow use of ";" separator in slack recipient entry (#25894)

Co-authored-by: John Bodley <4567245+john-bodley@users.noreply.github.com>

superset/reports/notifications/slack.py

@@ -44,6 +44,7 @@ from superset.reports.notifications.exceptions import (
     NotificationParamException,
     NotificationUnprocessableException,
 )
+from superset.utils.core import get_email_address_list
 from superset.utils.decorators import statsd_gauge
 
 logger = logging.getLogger(__name__)
@@ -60,7 +61,15 @@ class SlackNotification(BaseNotification):  # pylint: disable=too-few-public-met
     type = ReportRecipientType.SLACK
 
     def _get_channel(self) -> str:
-        return json.loads(self._recipient.recipient_config_json)["target"]
+        """
+        Get the recipient's channel(s).
+        Note Slack SDK uses "channel" to refer to one or more
+        channels. Multiple channels are demarcated by a comma.
+        :returns: The comma separated list of channel(s)
+        """
+        recipient_str = json.loads(self._recipient.recipient_config_json)["target"]
+
+        return ",".join(get_email_address_list(recipient_str))
 
     def _message_template(self, table: str = "") -> str:
         return __(

tests/unit_tests/reports/notifications/slack_tests.py

@@ -0,0 +1,58 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+import pandas as pd
+
+
+def test_get_channel_with_multi_recipients() -> None:
+    """
+    Test the _get_channel function to ensure it will return a string
+    with recipients separated by commas without interstitial spacing
+    """
+    from superset.reports.models import ReportRecipients, ReportRecipientType
+    from superset.reports.notifications.base import NotificationContent
+    from superset.reports.notifications.slack import SlackNotification
+
+    content = NotificationContent(
+        name="test alert",
+        header_data={
+            "notification_format": "PNG",
+            "notification_type": "Alert",
+            "owners": [1],
+            "notification_source": None,
+            "chart_id": None,
+            "dashboard_id": None,
+        },
+        embedded_data=pd.DataFrame(
+            {
+                "A": [1, 2, 3],
+                "B": [4, 5, 6],
+                "C": ["111", "222", '<a href="http://www.example.com">333</a>'],
+            }
+        ),
+        description='<p>This is <a href="#">a test</a> alert</p><br />',
+    )
+    slack_notification = SlackNotification(
+        recipient=ReportRecipients(
+            type=ReportRecipientType.SLACK,
+            recipient_config_json='{"target": "some_channel; second_channel, third_channel"}',
+        ),
+        content=content,
+    )
+
+    result = slack_notification._get_channel()
+
+    assert result == "some_channel,second_channel,third_channel"