artifacts-comment.yml

name: Comment on pull request
on:
  workflow_run:
    workflows: ["Build nightlies"]
    types: [completed]
jobs:
  pr_comment:
    if: ${{ github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.conclusion == 'success' }}
    runs-on: ubuntu-latest
    steps:
      - uses: actions/setup-node@v2
      - run: npm install axios
      - uses: actions/github-script@v6
        with:
          # This snippet is public-domain, taken from
          # https://github.com/oprypin/nightly.link/blob/master/.github/workflows/pr-comment.yml
          script: |
            const axios = require('axios');
            const {owner, repo} = context.repo;
            const run_id = ${{github.event.workflow_run.id}};
            const pull_head_sha = '${{github.event.workflow_run.head_sha}}';
            const pull_user_id = ${{github.event.sender.id}};

            const issue_number = await (async () => {
              const pulls = await github.rest.pulls.list({owner, repo});
              for (const pull of pulls.data) {
                if (pull.head.sha === pull_head_sha) {
                  return pull.number;
                }
              }
            })();
            if (issue_number) {
              core.info(`Using pull request ${issue_number}`);
            } else {
              return core.error(`No matching pull request found`);
            }

            const {data: {artifacts}} = await github.rest.actions.listWorkflowRunArtifacts({owner, repo, run_id});
            if (!artifacts.length) {
              return core.error(`No artifacts found`);
            }

            let body = `🚀 Thanks for the pull request!\n\nHere are the current build files for testing:\n\n`;
            for (const art of artifacts) {
              body += `\n* [${art.name}.zip](https://nightly.link/${owner}/${repo}/actions/artifacts/${art.id}.zip)`;
            }

            body += `\n\nDownload and unzip the file for your browser. Refer to the [readme](https://github.com/getAlby/lightning-browser-extension#-load-extension-into-browser) for detailed install instructions.`;

            body += `\n\nDon't forget: **keep earning sats!**\n`;

            const {data: comments} = await github.rest.issues.listComments({repo, owner, issue_number});
            const existing_comment = comments.find((c) => c.user.login === 'github-actions[bot]' && c.body.match(/current build files/) );
            if (existing_comment) {
              core.info(`Updating comment ${existing_comment.id}`);
              await github.rest.issues.updateComment({repo, owner, comment_id: existing_comment.id, body});
            } else {
              core.info(`Creating a comment`);
              await github.rest.issues.createComment({repo, owner, issue_number, body});
            }