sentry/.github/workflows/validate-new-issue.yml

name: Validate new issue
on:
  issues:
    types: ["opened"]
jobs:
  validate-new-issue:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: "Validate new issue"
        shell: bash
        env:
          GITHUB_TOKEN: ${{ github.token }}
        run: |
          issue_number=${{ github.event.issue.number }}
          echo "Validating issue #${issue_number}."

          # Trust users who belong to the getsentry org.
          if gh api "https://api.github.com/orgs/getsentry/members/${{ github.actor }}" >/dev/null 2>&1; then
            echo "Skipping validation, because ${{ github.actor }} is a member of the getsentry org."
            exit 0
          else
            echo "${{ github.actor }} is not a member of the getsentry org. 🧐"
          fi

          # Prep reasons for error message comment.
          REASON="your issue does not properly use one of this repo's available issue templates"
          REASON_EXACT_MATCH="you created an issue from a template without filling in anything"
          REASON_EMPTY="you created an empty issue"

          # Definition of valid:
          # - not empty (ignoring whitespace)
          # - matches a template
          #   - all the headings are also in this issue
          #   - extra headings in the issue are fine
          #   - order doesn't matter
          #   - case-sensitive tho
          # - not an *exact* match for a template (ignoring whitespace)
          function extract-headings { { sed 's/\r$//' "$1" | grep '^#' || echo -n ''; } | sort; }
          jq -r .issue.body "$GITHUB_EVENT_PATH" > issue
          if ! grep -q '[^[:space:]]' issue; then
            REASON="${REASON_EMPTY}"
          else
            extract-headings <(cat issue) > headings-in-issue
            for template in $(ls .github/ISSUE_TEMPLATE/*.md 2> /dev/null); do
              # Strip front matter. https://stackoverflow.com/a/29292490/14946704
              sed -i'' '1{/^---$/!q;};1,/^---$/d' "$template"
              extract-headings "$template" > headings-in-template
              echo -n "$(basename $template)? "
              if [ ! -s headings-in-template ]; then
                echo "No headers in template. 🤷"
              elif [ -z "$(comm -23 headings-in-template headings-in-issue)" ]; then
                echo "Match! 👍 💃"
                if diff -Bw "$template" issue > /dev/null; then
                  echo "... like, an /exact/ match. 😖"
                  REASON="${REASON_EXACT_MATCH}"
                  break
                else
                  gh api "/repos/:owner/:repo/issues/${issue_number}/labels" \
                    -X POST \
                    --input <(echo '{"labels":["Status: Unrouted"]}')
                  exit 0
                fi
              else
                echo "No match. 👎"
              fi
            done
          fi

          # Failed validation! Close the issue with a comment.
          cat << EOF > comment
          Sorry, friend. As far as this ol' bot can tell, ${REASON}. Please [try again](https://github.com/${{ github.repository }}/issues/new/choose), if you like. (And if I'm confused, please [let us know](https://github.com/getsentry/.github/issues/new?title=template+enforcer+is+confused&body=${{ github.event.issue.html_url }}). 😬)

          ----

          [![Did you see the memo about this?](https://user-images.githubusercontent.com/134455/104515469-e04a9c80-55c0-11eb-8e15-ffe9c0b8dd7f.gif)](https://www.youtube.com/watch?v=Fy3rjQGc6lA)

          ([log](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}))
          EOF

          echo -n "Commented: "
          gh issue comment ${{ github.event.issue.number }} --body "$(cat comment)"
          gh issue close ${{ github.event.issue.number }}
          echo "Closed with: \"${REASON}.\""