create_preview_sites.yml

name: Create Preview Sites

on:
  workflow_call:
    inputs:
      APP_ID:
        description: "App ID for the associated website"
        required: true
        type: string
      APP_NAME:
        description: "Application name for the comment"
        required: true
        type: string
    secrets:
      REQUEST_TOKEN:
        description: "Token for the request"
        required: true
      REQUEST_MESSAGE:
        description: "Message for the request"
        required: true
      ENDPOINT:
        description: "Request endpoint"
        required: true

jobs:
  create_preview_site:
    runs-on: ubuntu-latest
    steps:

    # Get the artifacts with the PR number and branch name
    - name: Download artifact
      uses: actions/github-script@v7.0.1
      with:
        script: |
          const fs = require('fs');
          const artifacts = await github.rest.actions.listWorkflowRunArtifacts({
             owner: context.repo.owner,
             repo: context.repo.repo,
             run_id: ${{ github.event.workflow_run.id }},
          });
          const matchArtifact = artifacts.data.artifacts.filter(artifact => artifact.name == "pr")[0];
          const download = await github.rest.actions.downloadArtifact({
             owner: context.repo.owner,
             repo: context.repo.repo,
             artifact_id: matchArtifact.id,
             archive_format: 'zip',
          });
          fs.writeFileSync('${{ github.workspace }}/pr.zip', Buffer.from(download.data));

    # Extract the info from the artifact and set variables
    - name: Extract PR info from artifact
      run: |
        unzip pr.zip -d pr
        BRANCH_NAME=$(cat ./pr/branch)
        SANITIZED_BRANCH_NAME=$(echo "$BRANCH_NAME" | sed 's/[\/\.]/-/g')
        echo "SANITIZED_BRANCH_NAME=$SANITIZED_BRANCH_NAME" >> $GITHUB_ENV
        echo "BRANCH_NAME=$BRANCH_NAME" >> $GITHUB_ENV

    # Kick off the job in amplify
    - name: Deploy Site
      env:
        APP_ID: ${{ inputs.APP_ID }}
        APP_NAME: ${{ inputs.APP_NAME }}
        REQUEST_TOKEN: ${{ secrets.REQUEST_TOKEN }}
        REQUEST_MESSAGE: ${{ secrets.REQUEST_MESSAGE }}
        ENDPOINT: ${{ secrets.ENDPOINT }}
      run: |
        sleep 20
        HMAC_KEY=$(echo -n $REQUEST_MESSAGE | openssl dgst -sha256 -hmac "$REQUEST_TOKEN" -binary | od -An -tx1 | tr -d ' \n'; echo)
        SIGNATURE="sha256=$HMAC_KEY"
        RESPONSE_CODE=$(curl -s -o /dev/null -w "%{http_code}" -X POST \
             -H "Content-Type: application/json" \
             -H "X-Hub-Signature: $SIGNATURE" \
             -d "{\"app_id\": \"$APP_ID\", \"branch_name\": \"$BRANCH_NAME\"}" \
          "$ENDPOINT")

        # check the response code and fail if not 200
        if [ "$RESPONSE_CODE" != "200" ]; then
          echo "Request failed with response code $RESPONSE_CODE"
          exit 1
        fi

    # Add preview link to comment if all 3 sites successfully start
    - name: Comment Preview Link
      if: success()
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        APP_ID: ${{ inputs.APP_ID }}
        APP_NAME: ${{ inputs.APP_NAME }}
      uses: actions/github-script@v7.0.1
      with:
        script: |
          const fs = require('fs');
          const prNumber = fs.readFileSync('./pr/number', 'utf8');
          const issueNumber = parseInt(prNumber);
          const { APP_ID, APP_NAME, SANITIZED_BRANCH_NAME } = process.env

          await github.rest.issues.createComment({
            owner: context.repo.owner,
            repo: context.repo.repo,
            issue_number: issueNumber,
            body: `Your preview site for the **${APP_NAME}** will be ready in a few minutes, please allow time for it to build. \n \n Heres your preview link: \n [${APP_NAME} preview](https://${SANITIZED_BRANCH_NAME}.${APP_ID}.amplifyapp.com)`
          });