gh_discussion_comment_to_slack.yml

# ## Summary
#
# Github Discussionのコメントが投稿された際に、内容をSlackに送信します。

# ## Background
#
# 現在GitHubのSlack連携ではコメント通知をサポートしていません。
#
# Get notifications for comment/reply of Discussions in slack (or equivalent)
# https://github.com/orgs/community/discussions/56821

# ## Usage
#
# name: Post GitHub Discussion comment to Slack
#
# on:
#   discussion_comment:
#     types: [created]
#
# jobs:
#   discussion_commented:
#     if: github.event.discussion && github.event.comment
#     uses: route06/actions/.github/workflows/gh_discussion_comment_to_slack.yml@v2
#     secrets:
#       slack-webhook-url: ${{ secrets.SLACK_XXX_WEBHOOK_URL }} # Set this secret

name: Post GitHub Discussion comment to Slack

on:
  workflow_call:
    secrets:
      slack-webhook-url:
        required: true

jobs:
  gh-discussion-comment-to-slack:
    runs-on: ubuntu-latest
    timeout-minutes: 10
    steps:
      # Note:
      # - 一度変数に入れることで、$や`をエスケープしている
      # - printfしないといい感じに"\n"が変換されない
      # - ref: https://times.hrbrain.co.jp/entry/2021/11/16/github-discussions-noti
      - name: Post to Slack
        env:
          COMMENT_BODY: ${{ github.event.comment.body }}
          DISCUSSION_TITLE: ${{ github.event.discussion.title }}
        run: |
          set -o pipefail
          body=$(
          cat <<"EOF"
          ${{ env.COMMENT_BODY }}
          EOF
          )
          printf -v markdown_message_escaped %b "$body"
          jq -n \
          --arg pretext "New discussion comment by <${{ github.event.comment.user.html_url }}|${{ github.event.comment.user.login }}>" \
          --arg title "*<${{ github.event.comment.html_url }}|Comment on #${{ toJSON(github.event.discussion.number) }} ${{ env.DISCUSSION_TITLE }}>*" \
          --arg text "$markdown_message_escaped" '
            {
            	"attachments": [
            		{
            			"blocks": [
            				{
            					"type": "section",
            					"text": {
            						"type": "mrkdwn",
            						"text": $pretext
            					}
            				},
            				{
            					"type": "section",
            					"text": {
            						"type": "mrkdwn",
            						"text": $title
            					}
            				},
            				{
            					"type": "section",
            					"text": {
            						"type": "mrkdwn",
            						"text": $text
            					}
            				}
            			]
            		}
            	]
            }
          ' | curl -X POST ${{ secrets.slack-webhook-url }} -d @-