First commit

Author: gasman

.github/slackchecker.py

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+import os
+import requests
+
+r = requests.head("https://wagtail.org/slack", headers={"User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36"}, allow_redirects=True)
+if r.url.startswith('https://wagtailcms.slack.com/join/shared_invite/'):
+    print("Slack invitation link is OK")
+else:
+    print("Slack invitation link has expired")
+
+    if "SLACK_WEBHOOK_URL" in os.environ:
+        print("Reporting to #nightly-build-failures slack channel")
+        response = requests.post(
+            os.environ["SLACK_WEBHOOK_URL"],
+            json={
+                "text": "Slack invitation link has expired. Please generate a new one and set it as the /slack redirect on wagtail.org",
+            },
+        )
+
+        print(f"Slack responded with: {response}")
+
+    else:
+        print(
+            "Unable to report to #nightly-build-failures slack channel because SLACK_WEBHOOK_URL is not set"
+        )

.github/workflows/slackchecker.yml

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+name: Slack checker
+
+on:
+  schedule:
+    - cron: "10 * * * *"
+
+  workflow_dispatch:
+
+jobs:
+  nightly-test:
+    # Cannot check the existence of secrets, so limiting to repository name to prevent all forks to run nightly.
+    # See: https://github.com/actions/runner/issues/520
+    if: ${{ github.repository == 'wagtail/slackchecker' }}
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+      - name: Install dependencies
+        run: |
+          pip install requests
+      - name: Test
+        id: test
+        continue-on-error: true
+        run: |
+          python .github/slackchecker.py
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}

README.md

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+# slackchecker
+
+a script to notify us when the Slack invitation link on wagtail.org has expired