label-extenal-contributions.yml

name: Workflow to label external contributions

on:
  pull_request_target:
    types: [opened, ready_for_review]

permissions:
  contents: read
  pull-requests: write

jobs:
  label:
    runs-on: ubuntu-latest
    steps:
    - name: Add external-contribution label
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      run: |
        PR_NUMBER=$(jq --raw-output .pull_request.number "$GITHUB_EVENT_PATH")
        REPO_FULL_NAME=$(jq --raw-output .repository.full_name "$GITHUB_EVENT_PATH")
        IS_FORK=$(jq --raw-output .pull_request.head.repo.fork "$GITHUB_EVENT_PATH")

        if [[ "$IS_FORK" == "true" ]]; then
            echo "This PR is created from a fork."
            HTTP_STATUS=$(curl -o /dev/null -s -w "%{http_code}\n" \
            -X POST \
            -H "Authorization: Bearer $GITHUB_TOKEN" \
            -H "Accept: application/vnd.github.v3+json" \
            "https://api.github.com/repos/$REPO_FULL_NAME/issues/$PR_NUMBER/labels" \
            -d '{"labels": ["external-contribution"]}')

            if [[ $HTTP_STATUS -ge 300 ]]; then
                echo "Failed to add label to PR, exiting."
                exit 1
            fi
        else
            echo "This PR is not created from a fork."
        fi