check-versions-paper.yml

name: "Check Minecraft Paper server versions"

on:
  schedule:
    - cron: "0 8 * * *" # Run every day in the morning

jobs:
  check-new-paper-version:
    runs-on: ubuntu-latest
    steps:
      - name: Check out repository
        uses: actions/checkout@v4

      - name: Fetch current versions
        run: |
          curl -X 'GET' 'https://api.papermc.io/v2/projects/paper' -H 'accept: application/json' | jq -r '.versions[]' > current_versions.txt

      - name: Compare versions and find new ones
        run: |
          new_versions=""
          for version in $(cat current_versions.txt); do
            # mc-image-helper allows only specific versions: https://github.com/itzg/mc-image-helper/blob/81c9e1037c551ae8db98468dbeeeb370da80f505/src/main/java/me/itzg/helpers/paper/InstallPaperCommand.java#L67
            # We skip 1.12 and 1.12.1 because Mojang no longer provides downloads for these versions.
            if [[ ! -d "$version" && "$version" =~ ^[0-9]+\.[0-9]+(\.[0-9]+)?$ && "$version" != "1.12" && "$version" != "1.12.1" ]]; then
              if [ -z "$new_versions" ]; then
                new_versions="$version"
              else
                new_versions="$new_versions,$version"
              fi
            fi
          done
          if [ -n "$new_versions" ]; then
            echo "Found new versions: $new_versions"
            echo "new_versions=$new_versions" >> $GITHUB_ENV
          else
            echo "No new versions found"
          fi

      - name: Trigger generate-server-configs job
        if: env.new_versions != ''
        uses: actions/github-script@v6
        with:
          script: |
            const new_versions = process.env.new_versions.split(',');
            for (const version of new_versions) {
              const build_info = await fetch('https://api.papermc.io/v2/projects/paper/versions/' + version + '/builds', {
                headers: {
                  'accept': 'application/json'
                }
              }).then(response => response.json());
              const build = build_info.builds.find(build => build.channel === 'default') || build_info.builds.find(build => build.channel === 'experimental');
              if (!build) {
                  console.log(`No default or experimental build found for version ${version}`);
                  continue;
              }
              console.log(`Triggering generate-server-configs job for version ${version} on channel ${build.channel}`);
              await github.rest.actions.createWorkflowDispatch({
                owner: context.repo.owner,
                repo: context.repo.repo,
                workflow_id: 'extract-configs-server.yml',
                ref: context.ref,
                inputs: {
                  paper_version: version,
                  paper_channel: build.channel
                }
              })
            }