ci: add a github action to send slack notification if number of reactions exceeds threshold in PRs and issues

.github/workflows/emoji-checker.yml

@@ -0,0 +1,104 @@
+name: Emoji Checker
+
+on:
+  schedule:
+    - cron: "0 8 * * *" # run this job at 8:00 am daily
+  pull_request_review_comment:
+    types: [created, edited]
+  issue_comment:
+    types: [created, edited]
+  discussion_comment:
+    types: [created, edited]
+env:
+  THRESHOLD_REACTIONS: 5
+jobs:
+  check-emojis:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Check emojis
+        uses: actions/github-script@v6
+        id: check-emojis
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const query = `
+              query ($owner: String!, $repo: String!, $number: Int!) {
+                repository(owner: $owner, name: $repo) {
+                  issueOrPullRequest(number: $number) {
+                    ... on Issue {
+                      title
+                      url
+                      reactions(last: 100) {
+                        nodes {
+                          content
+                          user {
+                            login
+                          }
+                        }
+                      }
+                    }
+                    ... on PullRequest {
+                      title
+                      url
+                      reactions(last: 100) {
+                        nodes {
+                          content
+                          user {
+                            login
+                          }
+                        }
+                      }
+                    }
+                  }
+                }
+              }
+            `;
+            const variables = {
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              number: context.issue.number
+            };
+            const result = await github.graphql(query, variables);
+            const node = result.repository.issueOrPullRequest;
+            const reactions = node.reactions.nodes;
+            const reactionCounts = {};
+            reactions.forEach(reaction => {
+              const content = reaction.content;
+              if (content in reactionCounts) {
+                reactionCounts[content]++;
+              } else {
+                reactionCounts[content] = 1;
+              }
+            });
+            let message = '';
+            let totalReactions = 0;
+            for (const [emoji, count] of Object.entries(reactionCounts)) {
+              message += `${emoji}: ${count}\n`;
+              totalReactions += count;
+            }
+            if (message !== '' && totalReactions >= process.env.THRESHOLD_REACTIONS) {
+              const title = node.title;
+              const url = node.url;
+              message = `The issue/PR "${title}" (${url}) has the following emojis:\n${message}`;
+              console.log(message);
+            }
+            else {
+              message = '';
+            }
+            return message;
+          result-encoding: string
+      - name: Post to a Slack channel
+        id: slack
+        if: ${{ steps.check-emojis.outputs.result }}
+        uses: slackapi/[email protected]
+        with:
+          # Slack channel id, channel name, or user id to post message.
+          # See also: https://api.slack.com/methods/chat.postMessage#channels
+          # You can pass in multiple channels to post to by providing a comma-delimited list of channel IDs.
+          channel-id: 'C050YTTDYUS'
+          # For posting a simple plain text message
+          slack-message: ${{ steps.check-emojis.outputs.result }}
+        env:
+          SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}