amplify-preview.yaml

on:
  pull_request:

permissions:
  pull-requests: write
  id-token: write

jobs:
  amplify-preview:
    name: Amplify Preview
    runs-on: ubuntu-latest
    environment: docs-amplify
    steps:
    - name: Extract branch name
      shell: bash
      run: echo "branch=${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}}" >> $GITHUB_OUTPUT
      id: extract_branch

    - name: Configure AWS credentials
      uses: aws-actions/configure-aws-credentials@e3dd6a429d7300a6a4c196c26e071d42e0343502 # v4
      with:
        aws-region: us-west-2
        role-to-assume: ${{ vars.IAM_ROLE }}

    - name: Describe Amplify branch
      id: get_amplify_branch
      env: 
        AMPLIFY_APP_IDS: ${{ vars.AMPLIFY_APP_IDS}}
        BRANCH_NAME: ${{ steps.extract_branch.outputs.branch }} 
      shell: bash
      run: |
        IFS=, app_id_array=($AMPLIFY_APP_IDS)
        for app_id in "${app_id_array[@]}"; do
          branch_info=$(aws amplify get-branch --app-id ${app_id} --branch-name ${BRANCH_NAME} --query 'branch')
          if [ $? -eq 0 ]; then
            echo "PREVIEW_URL=https://$(jq -r '.displayName' <<< "$branch_info").$app_id.amplifyapp.com" >> $GITHUB_OUTPUT
            echo "CREATE_TIME=$(jq -r '.createTime' <<< "$branch_info")"  >> $GITHUB_OUTPUT
            echo "UPDATE_TIME=$(jq -r '.updateTime' <<< "$branch_info")"  >> $GITHUB_OUTPUT
            echo "JOB_ID=$(jq -r '.activeJobId' <<< "$branch_info")"      >> $GITHUB_OUTPUT
            echo "APP_ID=${app_id}" >> $GITHUB_OUTPUT
            break
          fi
        done

    - name: Describe Amplify Deployment
      id: get_amplify_job
      env: 
        APP_ID: ${{ steps.get_amplify_branch.outputs.APP_ID }}
        JOB_ID: ${{ steps.get_amplify_branch.outputs.JOB_ID }}
        BRANCH_NAME: ${{ steps.extract_branch.outputs.branch }} 
      shell: bash
      continue-on-error: true
      run: |
        job_info=$(aws amplify get-job --app-id ${APP_ID} --branch-name ${BRANCH_NAME} --job-id ${JOB_ID} --query 'job.summary')
        echo "JOB_STATUS=$(jq -r '.status' <<< "$branch_info")" >> $GITHUB_OUTPUT

    - uses: actions/github-script@v7
      env:
        PREVIEW_URL: ${{ steps.get_amplify_branch.outputs.PREVIEW_URL }}
        UPDATE_TIME:  ${{ steps.get_amplify_branch.outputs.UPDATE_TIME }}
        JOB_ID:      ${{ steps.get_amplify_branch.outputs.JOB_ID }}
        JOB_STATUS:  ${{ steps.get_amplify_job.outputs.JOB_STATUS }}
      with:
        script: |
          const previewUrl = process.env.PREVIEW_URL;
          const jobId = process.env.JOB_ID;
          const jobStatus = process.env.JOB_STATUS || "unknown";
          const updatedAt = process.env.UPDATE_TIME;

          const commentBody = `![🤖](https://a0.awsstatic.com/libra-css/images/site/fav/favicon.ico) Amplify preview here: ${previewUrl}

          <details><summary>Preview details</summary>

          - **LAST_UPDATED_AT**: ${updatedAt}
          - **JOB_ID**: ${jobId}
          - **JOB_STATUS**: ${jobStatus}

          </details>
          `;

          const prProps = {
            issue_number: context.issue.number,
            owner: context.repo.owner,
            repo: context.repo.repo,
          };

          const comments = (await github.rest.issues.listComments(prProps))?.data;

          const existingComment = comments?.find((comment) =>
            comment.user.login === "github-actions[bot]" && comment.body.includes("Amplify preview here"));

          if (existingComment != null) {
            github.rest.issues.createComment({
              ...prProps,
              body: commentBody,
            })
          } else {
            github.rest.issues.updateComment({
              ...prProps,
              body: commentBody,
              comment_id: existingComment.id,
            })
          }