action.yml

name: 'GitHub Discussions Notifier'
description: 'Notify GitHub Discussion & Comment to Slack'
branding:
  icon: 'at-sign'  
  color: 'orange'

inputs:
  SLACK_CHANNEL_ID:
    description: 'Slack Channel Id'
    required: true
  SLACK_BOT_TOKEN:
    description: 'Slack Bot Token'
    required: true
  send-discussion-create:
    description: 'send discussion create notification?'
    required: false
    default: true
  send-discussion-comment:
    description: 'send discussion comment notification?'
    required: false
    default: true
  unfurl-links:
    description: 'Pass true to enable unfurling of primarily text-based content.'
    required: false
    default: false
  unfurl-media:
    description: 'Pass false to disable unfurling of media content.'
    required: false
    default: false

runs:
  using: "composite"
  steps:
    - name: Send GitHub Discussion Notification to Slack
      if: ${{ github.event.discussion && !github.event.comment && inputs.send-discussion-create }}
      # Note: 
      # - 一度変数に入れることで、$や`をエスケープしている
      # - https://stackoverflow.com/questions/69982822/is-there-a-way-to-escape-and-single-quotes-together-in-bash
      # - printfしないといい感じに"\n"が変換されない
      run: |
        title=$(
        cat <<"EOF"
        ${{ env.DISCUSSION_TITLE }}
        EOF
        )
        body=$(
        cat <<"EOF"
        ${{ env.DISCUSSION_BODY }}
        EOF
        )
        printf -v markdown_message_unescaped %b "<${{ env.DISCUSSION_URL }}|*$title*>\n$body"
        jq -n -r --arg text "$markdown_message_unescaped" '{
          "token":"${{ inputs.SLACK_BOT_TOKEN }}",
          "channel":"${{ inputs.SLACK_CHANNEL_ID }}",
          "blocks":[
            {
              "type":"section",
              "text":{
                "type":"mrkdwn",
                "text":"New Discussion by <${{ env.USER_URL }}|${{ env.USER_NAME }}>"
              }
            }
          ],
          "attachments":[
            {
              "blocks":[
                {
                  "type":"section",
                  "text":{
                    "type":"mrkdwn",
                    "text":$text
                  }
                }
              ]
            }
          ],
          "unfurl_links": ${{ inputs.unfurl-links }},
          "unfurl_media": ${{ inputs.unfurl-media }}
        }
        '|curl -X POST -H 'Authorization: Bearer ${{ inputs.SLACK_BOT_TOKEN }}' -H "Content-Type: application/json" -d @- https://slack.com/api/chat.postMessage
      shell: bash
      env:
        DISCUSSION_URL: ${{ github.event.discussion.html_url }}
        DISCUSSION_TITLE: ${{ github.event.discussion.title }}
        DISCUSSION_BODY: ${{ github.event.discussion.body }}
        USER_URL: ${{ github.event.discussion.user.html_url }}
        USER_NAME: ${{ github.event.discussion.user.login }}
    - name: Send GitHub Discussions Comment Notification to Slack
      if: ${{ github.event.comment && inputs.send-discussion-comment }}
      run: |
        title=$(cat << "EOF"
        ${{ env.DISCUSSION_TITLE }}
        EOF
        )
        body=$(cat << "EOF"
        ${{ env.COMMENT_BODY }}
        EOF
        )
        printf -v markdown_message_unescaped %b "*<${{ env.COMMENT_URL }}|Comment on $title>*\n$body"
        jq -n -r --arg text "$markdown_message_unescaped" '{
          "token":"${{ inputs.SLACK_BOT_TOKEN }}",
          "channel":"${{ inputs.SLACK_CHANNEL_ID }}",
          "blocks":[
            {
              "type":"section",
              "text":{
                "type":"mrkdwn",
                "text":"New comment by <${{ env.USER_URL }}|${{ env.USER_NAME }}>"
              }
            }
          ],
          "attachments":[
            {
              "blocks":[
                {
                  "type":"section",
                  "text":{
                    "type":"mrkdwn",
                    "text":$text
                  }
                }
              ]
            }
          ],
          "unfurl_links": ${{ inputs.unfurl-links }},
          "unfurl_media": ${{ inputs.unfurl-media }}
        }
        '|curl -X POST -H 'Authorization: Bearer ${{ inputs.SLACK_BOT_TOKEN }}' -H "Content-Type: application/json" -d @- https://slack.com/api/chat.postMessage
      shell: bash
      env:
        DISCUSSION_TITLE: ${{ github.event.discussion.title }}
        COMMENT_URL: ${{ github.event.comment.html_url }}
        COMMENT_BODY: ${{ github.event.comment.body }}
        USER_URL: ${{ github.event.comment.user.html_url }}
        USER_NAME: ${{ github.event.comment.user.login }}