check_author.yml

name: Check Author
on:
  pull_request_target:
    types: [opened]

jobs:
  get-delivery-files:
      runs-on: ubuntu-latest
      outputs:
        filenames: ${{ steps.files.outputs.added }}
      
      steps:
        - name: Get filenames of any deliveries being added
          id: files
          uses: Ana06/get-changed-files@v2.0.0
          with:
            format: 'json'
            filter: |
              deliveries/*.md
              maintenance_deliveries/*.md
            
  check_author:
    runs-on: ubuntu-latest 
    needs: get-delivery-files
    if: needs.get-delivery-files.outputs.filenames != '[]'
    strategy:
      fail-fast: false
      matrix:
        filename: ${{ fromJson(needs.get-delivery-files.outputs.filenames) }}
 
    steps:
      - uses: actions/checkout@v2
        with:
          ref: ${{ github.event.pull_request.head.sha }}

      - name: Parse delivery file 
        id: parse-delivery
        uses: w3f/parse-milestone-delivery-action@v3
        with:
          path: "${{ github.workspace }}/${{ matrix.filename }}"

      - name: Find PR author in application authors
        uses: actions/github-script@v5
        env:
          pr_author: ${{ github.event.pull_request.user.login }}
        with: 
          script: |
            await github.rest.repos.listCommits({
              owner: 'w3f',
              repo: 'Grants-Program',
              path: 'applications/${{ steps.parse-delivery.outputs.application_document }}'
            }).then( app_commits => {
              app_authors = app_commits.data.map(c => {return c.author.login});
              if(!app_authors.includes(process.env.pr_author))
                core.setFailed('PR author does not match any application author.');
            });