Label PR based on title #18847
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| name: Label PR based on title | |
| # PROCESS | |
| # | |
| # 1. Fetch PR details previously saved from untrusted location | |
| # 2. Parse details for safety | |
| # 3. Label PR based on semantic title (e.g., area, change type) | |
| # USAGE | |
| # | |
| # NOTE: meant to be used with ./.github/workflows/record_pr.yml | |
| # | |
| # Security Note: | |
| # | |
| # This workflow depends on "Record PR" workflow that runs in an untrusted location (forks) instead of `pull_request_target`. | |
| # This enforces zero trust where "Record PR" workflow always runs on fork with zero permissions on GH_TOKEN. | |
| # When "Record PR" completes, this workflow runs in our repository with the appropriate permissions and sanitize inputs. | |
| # | |
| # Coupled with "Approve GitHub Action to run on forks", we have confidence no privilege can be escalated, | |
| # since any malicious change would need to be approved, and upon social engineering, it'll have zero permissions. | |
| on: | |
| workflow_run: | |
| workflows: ["Record PR details"] | |
| types: | |
| - completed | |
| permissions: | |
| contents: read | |
| jobs: | |
| get_pr_details: | |
| permissions: | |
| actions: read # download PR artifact | |
| contents: read # checkout code | |
| # Guardrails to only ever run if PR recording workflow was indeed | |
| # run in a PR event and ran successfully | |
| if: ${{ github.event.workflow_run.conclusion == 'success' }} | |
| uses: ./.github/workflows/reusable_export_pr_details.yml | |
| with: | |
| record_pr_workflow_id: ${{ github.event.workflow_run.id }} | |
| workflow_origin: ${{ github.event.repository.full_name }} | |
| secrets: | |
| token: ${{ secrets.GITHUB_TOKEN }} | |
| label_pr: | |
| needs: get_pr_details | |
| runs-on: ubuntu-latest | |
| permissions: | |
| pull-requests: write # label respective PR | |
| steps: | |
| - name: Checkout repository | |
| uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2 | |
| - name: "Label PR based on title" | |
| uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1 | |
| env: | |
| PR_NUMBER: ${{ needs.get_pr_details.outputs.prNumber }} | |
| PR_TITLE: ${{ needs.get_pr_details.outputs.prTitle }} | |
| PR_LABELS: ${{ needs.get_pr_details.outputs.prLabels }} | |
| with: | |
| github-token: ${{ secrets.GITHUB_TOKEN }} | |
| # This safely runs in our base repo, not on fork | |
| # thus allowing us to provide a write access token to label based on PR title | |
| # and label PR based on semantic title accordingly | |
| script: | | |
| const script = require('.github/scripts/label_pr_based_on_title.js') | |
| await script({github, context, core}) |