Add codeowner workflow check

.github/workflows/codeowner_review_status.yml

@@ -0,0 +1,166 @@
+name: Code Owners Approval Check
+
+on:
+  pull_request:
+    branches:
+      - master
+    types: [opened, synchronize, reopened, ready_for_review]
+  pull_request_review:
+    types: [submitted, dismissed]
+
+permissions: {}
+
+jobs:
+  check-code-owners-approval:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      contents: read
+    steps:
+      - name: Check Code Owners Approval
+        id: check_approvals
+        uses: actions/github-script@v7
+        with:
+          github-token: ${{secrets.CODEOWNER_WORKFLOW_TOKEN}}
+          script: |
+            const { owner, repo, number } = context.issue;
+
+            // Get pull request details and files
+            const { data: pr } = await github.rest.pulls.get({ owner, repo, pull_number: number });
+            const { data: files } = await github.rest.pulls.listFiles({ owner, repo, pull_number: number });
+
+            // Get CODEOWNERS file content
+            let codeowners;
+            try {
+              const { data } = await github.rest.repos.getContent({
+                owner,
+                repo,
+                path: '.github/CODEOWNERS',
+              });
+              codeowners = Buffer.from(data.content, 'base64').toString('utf8');
+            } catch (error) {
+              console.log('CODEOWNERS file not found in .github directory. Skipping check.');
+              return;
+            }
+
+            // Parse CODEOWNERS file
+            const codeownersRules = codeowners.split('\n')
+              .filter(line => line.trim() && !line.startsWith('#'))
+              .map(line => {
+                const [pattern, ...owners] = line.split(/\s+/);
+                return { pattern, owners: owners.map(o => o.trim()) };
+              });
+
+            // Extract unique team slugs
+            const teamSlugs = [...new Set(codeownersRules.flatMap(rule => rule.owners))]
+              .map(owner => owner.replace(/^.*\//, ''));
+
+
+            // Get reviews
+            const { data: reviews } = await github.rest.pulls.listReviews({ owner, repo, pull_number: number });
+
+            const approvals = new Set(
+              reviews
+                .filter(review => review.state === 'APPROVED')
+                .map(review => review.user.login)
+            );
+
+            // Function to check if a file matches a pattern
+            const matchesPattern = (file, pattern) => {
+              // Handle directory patterns
+              if (pattern.endsWith('/')) {
+                return file.startsWith(pattern);
+              }
+
+              // Handle glob patterns
+              let regexPattern = pattern
+                .replace(/\./g, '\\.')
+                .replace(/\*/g, '[^/]*')
+                .replace(/\?/g, '[^/]')
+                .replace(/\//g, '\\/')
+                .replace(/\*\*/g, '.*');
+
+              // For double-star patterns, match any depth
+              if (pattern.includes('**')) {
+                return new RegExp(`^${regexPattern}`).test(file);
+              }
+
+              // For patterns without wildcards, check if the file is in the directory or is the file itself
+              if (!pattern.includes('*') && !pattern.includes('?')) {
+                return file === pattern || file.startsWith(pattern + '/');
+              }
+
+              // For single-star patterns, don't match across directory boundaries
+              return new RegExp(`^${regexPattern}$`).test(file);
+            };
+
+            // Get relevant code owners for the changed files
+            const relevantOwners = new Set();
+            const defaultOwner = codeownersRules.find(rule => rule.pattern === '*')?.owners[0];
+
+            files.forEach(file => {
+              let fileOwners = new Set();
+              let hasSpecificOwner = false;
+              codeownersRules.forEach(rule => {
+                if (matchesPattern(file.filename, rule.pattern)) {
+                  rule.owners.forEach(owner => {
+                    fileOwners.add(owner);
+                    if (rule.pattern !== '*') {
+                      hasSpecificOwner = true;
+                    }
+                  });
+                }
+              });
+              // If no specific owners found or only the default owner was found, use the default owner
+              if (!hasSpecificOwner && defaultOwner) {
+                fileOwners.add(defaultOwner);
+              }
+              fileOwners.forEach(owner => relevantOwners.add(owner));
+            });
+
+            if (relevantOwners.size === 0) {
+              console.log('No relevant code owners found for the changed files. Skipping check.');
+              return;
+            }
+
+            // Check if a user is a member of a team
+            async function checkTeamMembership(teamSlug) {
+              try {
+                const { data: teamMembers } = await github.rest.teams.listMembersInOrg({
+                  org: context.repo.owner,
+                  team_slug: teamSlug,
+                });
+                return teamMembers.map(teamMember => {
+                  const user = teamMember.login;
+                  if (approvals.has(user)) {
+                    return teamSlug;
+                  }
+                });
+              } catch (error) {
+                console.error(`Error checking membership for team ${teamSlug}: ${error}`);
+                return false;
+              }
+            }
+
+            let approvingTeams = new Set()
+
+            for (const teamSlug of relevantOwners) {
+              const strippedTeamSlug = teamSlug.replace('@DataDog/', '');
+              const teamApproval = await checkTeamMembership(strippedTeamSlug);
+              if (teamApproval.includes(strippedTeamSlug)) {
+                approvingTeams.add(teamSlug);
+              }
+            }
+
+            const codeOwnerStatus = Array.from(relevantOwners).map(owner => ({
+              owner,
+              approved: approvingTeams.has(owner),
+            }));
+
+            const missingApprovals = codeOwnerStatus.filter(status => !status.approved);
+
+            if (missingApprovals.length > 0) {
+              core.setFailed(`Missing approvals from code owners: ${missingApprovals.map(status => status.owner).join(', ')}`);
+            } else {
+              console.log('All relevant code owners have approved the pull request.');
+            }