Put the postmark where your team looks

name: Email grade

on:
  schedule:
    - cron: "17 6 * * *" # every day, 06:17 UTC
  workflow_dispatch:

permissions:
  contents: read

jobs:
  grade:
    runs-on: ubuntu-latest
    steps:
      - name: Fail if a domain drops below the grade
        shell: bash
        env:
          STAMP_API: https://stamp-zeta-two.vercel.app/api/v1/check
          DOMAINS: example.com example.org
          MIN_GRADE: B
        run: |
          case "$MIN_GRADE" in A|B|C|D) ;; *) echo "::error::MIN_GRADE must be A, B, C or D"; exit 2 ;; esac
          GRADE_CHECK='{"A":5,"B":4,"C":3,"D":2,"F":1} as $rank
          | if type != "object" then "unknown\tThe answer was not a report."
            elif .error then "unknown\t\(.error.message)"
            elif .state == "no-such-domain" then "fail\tThe domain does not exist."
            elif .grade == null then "unknown\t\(.summary)"
            elif $rank[.grade] < $rank[$min] then "fail\tGrade \(.grade) (\(.score) of 100), below \($min). \(.summary)"
            else "ok\tGrade \(.grade) (\(.score) of 100)." end'
          answer=$(mktemp)
          status=0
          for domain in $DOMAINS; do
            curl -sS -G --max-time 40 --retry 4 --retry-max-time 180 -o "$answer" "$STAMP_API" --data-urlencode "domain=$domain" || : > "$answer"
            verdict=$(jq -r --arg min "$MIN_GRADE" "$GRADE_CHECK" "$answer" 2>/dev/null || true)
            reason="${verdict#*$'\t'}"
            case "$verdict" in
              ok*) echo "$domain: $reason" ;;
              fail*) echo "::error title=$domain::$reason"; status=1 ;;
              unknown*) echo "::warning title=$domain::Could not check, so this run says nothing about its grade. $reason" ;;
              *) echo "::warning title=$domain::Could not check, so this run says nothing about its grade. No readable answer came back." ;;
            esac
          done
          exit "$status"