add workflows for suggestions on PRs

.github/workflows/comment-pr.yml

@@ -0,0 +1,56 @@
+# Description: This workflow is triggered when the `receive-pr` workflow completes to post suggestions on the PR.
+# Since this pull request has write permissions on the target repo, we should **NOT** execute any untrusted code.
+# https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
+---
+name: comment-pr
+
+on:
+  workflow_run:
+    workflows: ["receive-pr"]
+    types:
+      - completed
+
+jobs:
+  post-suggestions:
+    # https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#running-a-workflow-based-on-the-conclusion-of-another-workflow
+    if: ${{ github.event.workflow_run.conclusion == 'success' }}
+    runs-on: ubuntu-latest
+    env:
+      # https://docs.github.com/en/actions/reference/authentication-in-a-workflow#permissions-for-the-github_token
+      ACCESS_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{github.event.workflow_run.head_branch}}
+          repository: ${{github.event.workflow_run.head_repository.full_name}}
+
+      # Download the patch
+      - uses: actions/download-artifact@v4
+        with:
+          name: patch
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          run-id: ${{ github.event.workflow_run.id }}
+      - name: Apply patch
+        run: |
+          git apply git-diff.patch --allow-empty
+          rm git-diff.patch
+
+      # Download the PR number
+      - uses: actions/download-artifact@v4
+        with:
+          name: pr_number
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          run-id: ${{ github.event.workflow_run.id }}
+      - name: Read pr_number.txt
+        run: |
+          PR_NUMBER=$(cat pr_number.txt)
+          echo "PR_NUMBER=$PR_NUMBER" >> $GITHUB_ENV
+          rm pr_number.txt
+
+      # Post suggestions as a comment on the PR
+      - uses: googleapis/code-suggester@v4
+        with:
+          command: review
+          pull_number: ${{ env.PR_NUMBER }}
+          git_dir: '.'

.github/workflows/receive-pr.yml

@@ -0,0 +1,55 @@
+# Description: This workflow runs OpenRewrite recipes against opened pull request and upload the patch.
+# Since this pull request receives untrusted code, we should **NOT** have any secrets in the environment.
+# https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
+---
+name: receive-pr
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+    branches:
+      - master
+      - 2.[0-9]+
+      - 3.[0-9]+
+concurrency:
+  group: '${{ github.workflow }} @ ${{ github.ref }}'
+  cancel-in-progress: true
+
+jobs:
+  upload-patch:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{github.event.pull_request.head.ref}}
+          repository: ${{github.event.pull_request.head.repo.full_name}}
+      - uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+          cache: 'maven'
+
+      # Capture the PR number
+      # https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#using-data-from-the-triggering-workflow
+      - name: Create pr_number.txt
+        run: echo "${{ github.event.number }}" > pr_number.txt
+      - uses: actions/upload-artifact@v4
+        with:
+          name: pr_number
+          path: pr_number.txt
+      - name: Remove pr_number.txt
+        run: rm -f pr_number.txt
+
+      # Execute recipes
+      - name: Apply OpenRewrite recipes
+        run: mvn --activate-profiles openrewrite org.openrewrite.maven:rewrite-maven-plugin:run
+
+      # Capture the diff
+      - name: Create patch
+        run: |
+          git diff | tee git-diff.patch
+      - uses: actions/upload-artifact@v4
+        with:
+          name: patch
+          path: git-diff.patch

pom.xml

@@ -143,7 +143,7 @@ com.fasterxml.jackson.core.*;version=${project.version}
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>build-helper-maven-plugin</artifactId>
       </plugin>
-      
+
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-shade-plugin</artifactId>
@@ -316,4 +316,36 @@ com.fasterxml.jackson.core.*;version=${project.version}
     </dependency>
   </dependencies>
 
+  <profiles>
+    <profile>
+      <id>openrewrite</id>
+      <!-- `mvn -P openrewrite org.openrewrite.maven:rewrite-maven-plugin:run` -->
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.openrewrite.maven</groupId>
+            <artifactId>rewrite-maven-plugin</artifactId>
+            <version>5.41.0</version>
+            <configuration>
+              <activeRecipes>
+                <recipe>org.openrewrite.java.OrderImports</recipe>
+              </activeRecipes>
+              <activeStyles>
+                <style>io.github.timoa.misc.JacksonImportStyle</style>
+              </activeStyles>
+              <failOnDryRunResults>true</failOnDryRunResults>
+            </configuration>
+            <dependencies>
+              <dependency>
+                <groupId>io.github.timo-a</groupId>
+                <artifactId>rewrite-recipe-starter</artifactId>
+                <version>0.4.0</version>
+              </dependency>
+            </dependencies>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+  </profiles>
+
 </project>