Work around to enable SonarCloud GitHub Actions to scan Vue.js files containing TypeScript

ci.yml

# Work around for issue described here:
# https://community.sonarsource.com/t/sonarqube-scanner-fails-to-analyze-vue-files-failed-to-parse-file-vue/17751/2
# https://jira.sonarsource.com/browse/MMF-1441

# This is for use in a GitHub Actions script using the SonarCloud GitHub Action which runs the scanner in Docker.
# If you're running Sonar scanner outside of GitHub Actions this hack certainly requires changes to make
# it work - I wish you luck!
#
# The basic idea in the hack is to run an Nginx docker container, alongside the Sonar scanner container, 
# as a proxy for sonarcloud.io. Nginx intercepts the request to download the javascript scanning plugin
# and serves our modified version. We create our own version by downloading the original, unpacking it,
# changing a line in the source code for parsing typescript in Vue.js files, pack it up again. 
# The SONARCLOUD_URL env var is used by the scanner so points at the local nginx port. Fortunately it
# doesn't require HTTPS.
#
# This hack will stop working if the scanner behaviour changes or a significant new version of the javascript
# scanning plugin is released... but in the mean time it works a treat.


  - name: Hack SonarCloud
    run: |
        set -x
        mkdir temp
        cd temp
        curl -o js.pack https://sonarcloud.io/api/plugins/download?plugin=javascript
        unpack200 js.pack js.jar
        rm js.pack
        jar xf js.jar eslint-bridge-1.0.0.tgz
        tar -xf eslint-bridge-1.0.0.tgz
        rm eslint-bridge-1.0.0.tgz
        sed -i "s/const result = VueJS/config['parser'] = '@typescript-eslint\/parser'; const result = VueJS/" package/lib/parser.js
        tar -czf eslint-bridge-1.0.0.tgz package
        rm -rf package
        jar uf js.jar eslint-bridge-1.0.0.tgz
        cd ..
        cat <<EOT >> nginx.conf
        worker_processes 1;
        events { worker_connections 1024; }
        http {
            server {
                listen 8080;
                root /var/www;
                location / {
                    error_page 418 = @myfile;
                    if ( \$arg_plugin = "javascript" ) { return 418; }
                    proxy_pass         https://sonarcloud.io/;
                    proxy_redirect     off;
                    proxy_set_header   Host \$host;
                }
                location @myfile {
                    sendfile on;
                    add_header Sonar-MD5 $(md5sum temp/js.jar | awk '{ print $1 }');
                    rewrite ^ /js.jar break;
                }
            }
        }
        EOT
        cat nginx.conf
        docker run -d -p 8080:8080 -v $(pwd)/temp:/var/www -v $(pwd)/nginx.conf:/etc/nginx/nginx.conf:ro nginx
        sleep 5
        echo "::set-env name=SONARCLOUD_URL::http://$(docker network inspect bridge --format='{{(index .IPAM.Config 0).Gateway}}'):8080"

  - name: SonarCloud Scan
    uses: sonarsource/sonarcloud-github-action@master
    env:
      GITHUB_TOKEN: ${{ github.token }}
      SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}