Gardener - Notify Slack #142
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| name: Gardener - Notify Slack | |
| # Runs after `Gardener - Notify Event` completes. Posts a summary to Slack, | |
| # and for Dependabot-opened PRs also applies the `devtools-gardener` label | |
| # (so Dependabot PRs show up in the gardener flow without a human having | |
| # to label them). | |
| # | |
| # The workflow_run trigger runs this job in the default-branch context with | |
| # full GITHUB_TOKEN permissions and Actions secret access — this is what | |
| # lets it succeed for Dependabot-opened PRs, where the upstream event | |
| # workflow can't label or reach secrets directly. Labels applied here via | |
| # GITHUB_TOKEN do not trigger another `labeled` run (loop prevention), so | |
| # Slack only gets one post per PR. | |
| on: | |
| workflow_run: | |
| workflows: ['Gardener - Notify Event'] | |
| types: [completed] | |
| permissions: | |
| contents: read | |
| issues: write | |
| pull-requests: write | |
| actions: read | |
| jobs: | |
| notify: | |
| # `conclusion == success` also covers runs where the capture job was | |
| # skipped by its `if` gate (no matching label, etc.) — in that case | |
| # no artifact was uploaded, so the download step below no-ops. | |
| if: github.event.workflow_run.conclusion == 'success' | |
| runs-on: ubuntu-latest | |
| steps: | |
| - name: Download event payload | |
| id: download | |
| continue-on-error: true | |
| uses: actions/download-artifact@v4 | |
| with: | |
| name: gardener-event | |
| run-id: ${{ github.event.workflow_run.id }} | |
| github-token: ${{ secrets.GITHUB_TOKEN }} | |
| - name: Add devtools-gardener label to Dependabot PR | |
| if: steps.download.outcome == 'success' | |
| env: | |
| GH_TOKEN: ${{ secrets.GITHUB_TOKEN }} | |
| GH_REPO: ${{ github.repository }} | |
| run: | | |
| ACTION=$(jq -r '.action' event.json) | |
| LOGIN=$(jq -r '.pull_request.user.login // ""' event.json) | |
| # Only the Dependabot-opened path needs labeling here. On manual | |
| # `labeled` events the label is already on the PR/issue. | |
| if [ "$ACTION" != "opened" ] || [ "$LOGIN" != "dependabot[bot]" ]; then | |
| exit 0 | |
| fi | |
| NUMBER=$(jq -r '.pull_request.number' event.json) | |
| gh pr edit "$NUMBER" --add-label devtools-gardener | |
| - name: Post to Slack | |
| if: steps.download.outcome == 'success' | |
| continue-on-error: true | |
| env: | |
| SLACK_BOT_TOKEN: ${{ secrets.SLACK_GARDENER_BOT_TOKEN }} | |
| SLACK_CHANNEL_ID: ${{ vars.GARDENER_SLACK_CHANNEL_ID }} | |
| run: | | |
| KIND=$(jq -r 'if has("pull_request") then "PR" else "Issue" end' event.json) | |
| # Pull the body out, truncate, then convert GitHub Markdown to | |
| # Slack mrkdwn. Links and fenced code blocks are stashed before | |
| # the HTML-escape pass so their contents survive verbatim (a `&` | |
| # inside a URL must stay raw, and code content shouldn't be | |
| # mangled). Blockquote `> ` markers are also stashed so the | |
| # `>` → `>` escape doesn't break them. Everything else is | |
| # HTML-escaped so user-supplied `<`, `>`, `&` can't collide | |
| # with Slack link syntax or injected mentions like <!channel>. | |
| BODY=$(jq -r '(.issue // .pull_request).body // ""' event.json) | |
| if [ ${#BODY} -gt 1000 ]; then | |
| BODY="${BODY:0:1000}…" | |
| fi | |
| BODY=$(printf '%s' "$BODY" | perl -0777 -pe ' | |
| my @u; | |
| s{\[([^\]]+)\]\(([^)]+)\)}{push @u, $2; "\x01$#u\x02$1\x03"}ge; | |
| my @c; | |
| s{^```[^\n]*\n(.*?)\n```$}{push @c, $1; "\x04$#c\x05"}gems; | |
| s/^> /\x06/gm; | |
| s/^#{1,6}\s+(.+)$/*$1*/gm; | |
| s/\*\*(.+?)\*\*/*$1*/g; | |
| s/^(\s*)- \[x\]\s+/$1✓ /gm; | |
| s/^(\s*)[-*]\s+/$1• /gm; | |
| s/&/&/g; | |
| s/</</g; | |
| s/>/>/g; | |
| s/\x06/> /g; | |
| s{\x01(\d+)\x02(.*?)\x03}{"<$u[$1]|$2>"}ge; | |
| s{\x04(\d+)\x05}{"```\n$c[$1]\n```"}ge; | |
| ') | |
| jq \ | |
| --arg channel "$SLACK_CHANNEL_ID" \ | |
| --arg kind "$KIND" \ | |
| --arg body "$BODY" \ | |
| ' | |
| def escape: gsub("&";"&") | gsub("<";"<") | gsub(">";">"); | |
| (.issue // .pull_request) as $i | |
| | ([$i.labels[]?.name | select(. != "devtools-gardener")] | |
| | map("`\(.)`") | join(" ")) as $labels | |
| | (if $kind == "PR" | |
| then " · \($i.changed_files) files, +\($i.additions)/-\($i.deletions)" | |
| + (if $i.draft then " · draft" else "" end) | |
| else "" end) as $meta | |
| | [ "*<\($i.html_url)|\($kind) #\($i.number)>* — \(($i.title | escape))", | |
| "_opened by \($i.user.login)\($meta)_" ] | |
| + (if $body != "" then [$body] else [] end) | |
| + (if $labels != "" then [$labels] else [] end) | |
| | join("\n") as $msg | |
| | { channel: $channel, text: "\($kind) #\($i.number): \($i.title)", | |
| blocks: [{ type: "section", text: { type: "mrkdwn", text: $msg } }] } | |
| ' event.json | curl -sf -X POST \ | |
| -H "Authorization: Bearer $SLACK_BOT_TOKEN" \ | |
| -H 'Content-type: application/json; charset=utf-8' \ | |
| -d @- https://slack.com/api/chat.postMessage |