GitHub オーガニゼーションのリポジトリ作成を通知する GitHub Actions ワークフローを作る

name: Notify New Repos to Slack

on:
  schedule:
    - cron: '0 15 * * *'  #1
  workflow_dispatch:

jobs:
  notify:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Setup Bun
        uses: oven-sh/setup-bun@v2  #2

      - name: Install dependencies
        run: bun install --no-save  #3

      - name: Notify new repos to Slack
        env:
          GH_PAT: ${{ secrets.ORG_REPO_PAT }}. #4
          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }} #5
          GITHUB_ORG: ${{ vars.ORG_NAME }} #6
        run: bun run src/notify-new-repos.ts #7

const org = process.env.GITHUB_ORG;
const token = process.env.GH_PAT;
const slackWebhook = process.env.SLACK_WEBHOOK_URL;

const query = `
  query($org: String!) {
    organization(login: $org) {
      repositories(first: 50, orderBy: {field: CREATED_AT, direction: DESC}) {
        nodes {
          name
          url
          createdAt
          visibility
        }
      }
    }
  }
`;

let repos: { name: string; url: string; createdAt: string; visibility: string }[] = [];
try {
  const data = await graphql<{ organization: { repositories: { nodes: typeof repos } } }>(query, {
    org,
    headers: { authorization: `token ${token}` }
  });
  repos = data.organization.repositories.nodes;
} catch (err) {
  console.error('GitHub GraphQL API error:', err);
  process.exit(1);
}

const now = new Date();
const JST_OFFSET = 9 * 60;
const jstNow = new Date(now.getTime() + (JST_OFFSET - now.getTimezoneOffset()) * 60000);
const yesterday = new Date(jstNow);
yesterday.setDate(jstNow.getDate() - 1);
const ymd = (d: Date) => d.toISOString().slice(0, 10);
const yesterdayJSTDate = ymd(yesterday);

const newRepos = repos.filter(r => {
  const created = new Date(r.createdAt);
  const jstCreated = new Date(created.getTime() + JST_OFFSET * 60000);
  return ymd(jstCreated) === yesterdayJSTDate;
});

let message: string;
if (newRepos.length) {
  message = "<!here>\nList of newly created repositories:\n" +
    newRepos.map(r => `• <${r.url}|${r.name}> (created at ${r.createdAt.slice(0,10)} ${r.visibility})`).join('\n');
} else {
  message = "No new repositories were created yesterday.";
}

try {
  const resp = await fetch(slackWebhook, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ text: message }),
  });
  if (!resp.ok) {
    console.error('Slack notification failed:', await resp.text());
    process.exit(1);
  }
  console.log('Slack notification succeeded:', message);
} catch (err) {
  console.error('Slack notification failed:', err);
  process.exit(1);
}