From ab7be7eb04c5bc70e4a8d54b0b0881f6c9d6227b Mon Sep 17 00:00:00 2001
From: RedYetiDev <38299977+RedYetiDev@users.noreply.github.com>
Date: Sat, 25 May 2024 11:23:16 -0400
Subject: [PATCH] meta: request reviews from github actions

---
 .github/workflows/handle-pr-open.yml | 24 ++++++++
 .github/workflows/label-pr.yml       | 18 ------
 tools/actions/pr-open.js             | 91 ++++++++++++++++++++++++++++
 3 files changed, 115 insertions(+), 18 deletions(-)
 create mode 100644 .github/workflows/handle-pr-open.yml
 delete mode 100644 .github/workflows/label-pr.yml
 create mode 100644 tools/actions/pr-open.js

diff --git a/.github/workflows/handle-pr-open.yml b/.github/workflows/handle-pr-open.yml
new file mode 100644
index 00000000000000..dd7a1c74155ee3
--- /dev/null
+++ b/.github/workflows/handle-pr-open.yml
@@ -0,0 +1,24 @@
+name: Handle PRs
+
+on:
+  pull_request_target:
+    types: [opened]
+
+permissions:
+  contents: read
+  pull-requests: write
+  issues: write
+
+jobs:
+  main:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29  # v4.1.6
+        name: Checkout default branch
+      - uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea  # v7.0.1
+        name: Make initial comment
+        with:
+          script: |
+            const initialCommentBuilder = require('${{ github.workspace }}/tools/actions/pr-open.js');
+            await initialCommentBuilder(github, context);
diff --git a/.github/workflows/label-pr.yml b/.github/workflows/label-pr.yml
deleted file mode 100644
index 95fdd42a4c700a..00000000000000
--- a/.github/workflows/label-pr.yml
+++ /dev/null
@@ -1,18 +0,0 @@
-name: Label PRs
-
-on:
-  pull_request_target:
-    types: [opened]
-
-permissions:
-  contents: read
-
-jobs:
-  label:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: nodejs/node-pr-labeler@d4cf1b8b9f23189c37917000e5e17e796c770a6b  # v1
-        with:
-          repo-token: ${{ secrets.GH_USER_TOKEN }}
-          configuration-path: .github/label-pr-config.yml
diff --git a/tools/actions/pr-open.js b/tools/actions/pr-open.js
new file mode 100644
index 00000000000000..c91eb9c922daa2
--- /dev/null
+++ b/tools/actions/pr-open.js
@@ -0,0 +1,91 @@
+'use strict';
+
+module.exports = async (client, context) => {
+  function globToRegex(glob) {
+    const patterns = {
+      '*': '([^\\/]+)',
+      '**': '(.+\\/)?([^\\/]+)',
+      '**/': '(.+\\/)',
+    };
+
+    const escapedGlob = glob.replace(/\./g, '\\.').replace(/\*\*$/g, '(.+)');
+    const regexString = '^(' + escapedGlob.replace(/\*\*\/|\*\*|\*/g, (match) => patterns[match] || '') + ')$';
+    return new RegExp(regexString);
+  }
+
+  class CodeOwners {
+    constructor(fileContent) {
+      this.owners = fileContent.split('\n').map((line) => line.trim())
+                .filter((line) => line && !line.startsWith('#'))
+                .map((line) => {
+                  const [path, ...owners] = line.split(/\s+/);
+                  return { path: globToRegex(path), owners };
+                });
+    }
+
+    getOwners(filePath) {
+      const normalizedPath = filePath.startsWith('/') ? filePath : `/${filePath}`;
+      return this.owners
+                .filter(({ path }) => path.test(normalizedPath))
+                .flatMap(({ owners }) => owners);
+    }
+  }
+
+  async function getChangedFiles(base, head) {
+    const { data } = await client.rest.repos.compareCommits({
+      owner: context.repo.owner,
+      repo: context.repo.repo,
+      base,
+      head,
+    });
+    return data.files.map((file) => file.filename);
+  }
+
+  async function getCodeOwners() {
+    const { data } = await client.rest.repos.getContent({
+      owner: context.repo.owner,
+      repo: context.repo.repo,
+      path: '.github/CODEOWNERS',
+    });
+
+    const content = Buffer.from(data.content, 'base64').toString('utf8');
+    return new CodeOwners(content);
+  }
+
+  async function makeInitialComment(changedFiles) {
+    const codeOwners = await getCodeOwners();
+
+    const owners = new Set();
+    changedFiles.forEach((file) => {
+      codeOwners.getOwners(file).forEach((owner) => owners.add(owner));
+    });
+
+    const ownersList = Array.from(owners).map((owner) => `- ${owner}`).join('\n');
+
+    const body =
+            'Hi 👋! Thank you for submitting this pull-request!\n\n' +
+            'According to the CODEOWNERS file, the following people are responsible for' +
+            "reviewing changes to the files you've modified:\n\n" +
+            ownersList + '\n\n' +
+            'They, along with other project maintainers, will be notified of your pull request.' +
+            'Please be patient and wait for them to review your changes.\n\n' +
+            "If you have any questions, please don't hesitate to ask!";
+
+    return client.rest.issues.createComment({
+      owner: context.repo.owner,
+      repo: context.repo.repo,
+      issue_number: context.payload.pull_request.number,
+      body: body,
+    });
+  }
+
+  const base = context.payload.pull_request?.base?.sha;
+  const head = context.payload.pull_request?.head?.sha;
+
+  if (!base || !head) {
+    throw new Error('Cannot get base or head commit');
+  }
+
+  const changedFiles = await getChangedFiles(base, head);
+  await makeInitialComment(changedFiles);
+};