wordpress-develop/.github/workflows/slack-notifications.yml

##
# A reusable workflow for posting messages to the Making WordPress
# Core Slack Instance by submitting data to Slack webhook URLs
# received by Slack Workflows.
##
name: Slack Notifications

on:
  workflow_run:
    workflows:
      - Code Coverage Report
      - Coding Standards
      - End-to-end Tests
      - JavaScript Tests
      - PHP Compatibility
      - PHPUnit Tests
      - Test NPM
      - Test old branches
    types:
      - completed
    branches:
      - '[3-4].[0-9]'
      - '5.[0-8]'

  workflow_call:
    inputs:
      calling_status:
        description: 'The status of the calling workflow'
        type: string
        required: true
    secrets:
      SLACK_GHA_SUCCESS_WEBHOOK:
        description: 'The Slack webhook URL for a successful build.'
        required: true
      SLACK_GHA_CANCELLED_WEBHOOK:
        description: 'The Slack webhook URL for a cancelled build.'
        required: true
      SLACK_GHA_FIXED_WEBHOOK:
        description: 'The Slack webhook URL for a fixed build.'
        required: true
      SLACK_GHA_FAILURE_WEBHOOK:
        description: 'The Slack webhook URL for a failed build.'
        required: true

env:
  CURRENT_BRANCH: ${{ github.event_name == 'workflow_run' && github.event.workflow_run.head_branch || github.ref_name }}

jobs:
  # Gathers the details needed for Slack notifications.
  #
  # These details are passed as outputs to the subsequent, dependant jobs that
  # submit data to Slack webhook URLs configured to post messages.
  #
  # Performs the following steps:
  # - Retrieves the workflow ID (if necessary).
  # - Retrieves the workflow URL (if necessary).
  # - Retrieves the previous workflow run and stores its conclusion.
  # - Sets the previous conclusion as an output.
  # - Prepares the commit message.
  # - Constructs and stores a message payload as an output.
  prepare:
    name: Prepare notifications
    runs-on: ubuntu-latest
    timeout-minutes: 5
    if: ${{ github.repository == 'WordPress/wordpress-develop' && github.event.workflow_run.event != 'pull_request' }}
    outputs:
      previous_conclusion: ${{ steps.previous-conclusion.outputs.previous_conclusion }}
      payload: ${{ steps.create-payload.outputs.payload }}

    steps:
      - name: Get the workflow ID
        id: current-workflow-id
        if: ${{ github.event_name == 'push' || github.event_name == 'schedule' || github.event_name == 'workflow_dispatch' }}
        uses: actions/github-script@441359b1a30438de65712c2fbca0abe4816fa667 # v5.0.0
        with:
          script: |
            const workflow_run = await github.rest.actions.getWorkflowRun({
              owner: context.repo.owner,
              repo: context.repo.repo,
              run_id: ${{ github.run_id }},
            });
            return workflow_run.data.workflow_id;            

      - name: Get details about the previous workflow run
        id: previous-result
        uses: actions/github-script@441359b1a30438de65712c2fbca0abe4816fa667 # v5.0.0
        with:
          script: |
            const previous_runs = await github.rest.actions.listWorkflowRuns({
              owner: context.repo.owner,
              repo: context.repo.repo,
              workflow_id: ${{ github.event_name == 'workflow_run' && github.event.workflow_run.workflow_id || steps.current-workflow-id.outputs.result }},
              branch: '${{ env.CURRENT_BRANCH }}',
              per_page: 1,
              page: 2,
            });
            return previous_runs.data.workflow_runs[0].conclusion;            

      - name: Store previous conclusion as an output
        id: previous-conclusion
        run: echo "::set-output name=previous_conclusion::${{ steps.previous-result.outputs.result }}"

      - name: Get the commit message
        id: current-commit-message
        uses: actions/github-script@441359b1a30438de65712c2fbca0abe4816fa667 # v5.0.0
        if: ${{ github.event_name == 'workflow_dispatch' || github.event_name == 'schedule' }}
        with:
          script: |
            const commit_details = await github.rest.repos.getCommit({
              owner: context.repo.owner,
              repo: context.repo.repo,
              ref: '${{ github.sha }}'
            });
            return commit_details.data.commit.message;            

      - name: Prepare commit message.
        id: commit-message
        run: |
          COMMIT_MESSAGE=$(cat <<'EOF' | awk 'NR==1' | sed 's/`/\\`/g' | sed 's/\"/\\\\\\"/g' | sed 's/\$/\\$/g'
          ${{ github.event_name == 'workflow_run' && github.event.workflow_run.head_commit.message || ( github.event_name == 'workflow_dispatch' || github.event_name == 'schedule' ) && fromJson( steps.current-commit-message.outputs.result ) || github.event.head_commit.message }}
          EOF
          )
          echo "::set-output name=commit_message_escaped::${COMMIT_MESSAGE}"          

      - name: Construct payload and store as an output
        id: create-payload
        run: echo "::set-output name=payload::{\"workflow_name\":\"${{ github.event_name == 'workflow_run' && github.event.workflow_run.name || github.workflow }}\",\"ref_name\":\"${{ env.CURRENT_BRANCH }}\",\"run_url\":\"https://github.com/WordPress/wordpress-develop/actions/runs/${{ github.event_name == 'workflow_run' && github.event.workflow_run.id || github.run_id }}\",\"commit_message\":\"${{ steps.commit-message.outputs.commit_message_escaped }}\"}"

  # Posts notifications when a workflow fails.
  failure:
    name: Failure notifications
    runs-on: ubuntu-latest
    timeout-minutes: 5
    needs: [ prepare ]
    if: ${{ github.event_name == 'workflow_run' && github.event.workflow_run.conclusion == 'failure' || inputs.calling_status == 'failure' || failure() }}

    steps:
      - name: Post failure notifications to Slack
        uses: slackapi/slack-github-action@410ae57cff5c6b682b106440be0e6c7eb8c98c9d # v1.16.0
        with:
          payload: ${{ needs.prepare.outputs.payload }}
        env:
          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_GHA_FAILURE_WEBHOOK }}

  # Posts notifications the first time a workflow run succeeds after previously failing.
  fixed:
    name: Fixed notifications
    runs-on: ubuntu-latest
    timeout-minutes: 5
    needs: [ prepare ]
    if: ${{ needs.prepare.outputs.previous_conclusion == 'failure' && ( github.event_name == 'workflow_run' && github.event.workflow_run.conclusion == 'success' || inputs.calling_status == 'success' ) && success() }}

    steps:
      - name: Post failure notifications to Slack
        uses: slackapi/slack-github-action@410ae57cff5c6b682b106440be0e6c7eb8c98c9d # v1.16.0
        with:
          payload: ${{ needs.prepare.outputs.payload }}
        env:
          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_GHA_FIXED_WEBHOOK }}

  # Posts notifications when a workflow is successful.
  success:
    name: Success notifications
    runs-on: ubuntu-latest
    timeout-minutes: 5
    needs: [ prepare ]
    if: ${{ github.event_name == 'workflow_run' && github.event.workflow_run.conclusion == 'success' || inputs.calling_status == 'success' && success() }}

    steps:
      - name: Post success notifications to Slack
        uses: slackapi/slack-github-action@410ae57cff5c6b682b106440be0e6c7eb8c98c9d # v1.16.0
        with:
          payload: ${{ needs.prepare.outputs.payload }}
        env:
          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_GHA_SUCCESS_WEBHOOK }}

  # Posts notifications when a workflow is cancelled.
  cancelled:
    name: Cancelled notifications
    runs-on: ubuntu-latest
    timeout-minutes: 5
    needs: [ prepare ]
    if: ${{ github.event_name == 'workflow_run' && github.event.workflow_run.conclusion == 'cancelled' || inputs.calling_status == 'cancelled' || cancelled() }}

    steps:
      - name: Post cancelled notifications to Slack
        uses: slackapi/slack-github-action@410ae57cff5c6b682b106440be0e6c7eb8c98c9d # v1.16.0
        with:
          payload: ${{ needs.prepare.outputs.payload }}
        env:
          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_GHA_CANCELLED_WEBHOOK }}