def str = 'https://w...content-available-to-author-only...s.net/path?token=eyJ0eXAiOiJKV1Qi&value=123456789'
def map = new URL(str).query?.split('&').collectEntries{ [(it.split('=').first()): it.split('=').last()]}
println map.token
println map.value
ZGVmIHN0ciA9ICdodHRwczovL3cuLi5jb250ZW50LWF2YWlsYWJsZS10by1hdXRob3Itb25seS4uLnMubmV0L3BhdGg/dG9rZW49ZXlKMGVYQWlPaUpLVjFRaSZ2YWx1ZT0xMjM0NTY3ODknCmRlZiBtYXAgPSBuZXcgVVJMKHN0cikucXVlcnk/LnNwbGl0KCcmJykuY29sbGVjdEVudHJpZXN7IFsoaXQuc3BsaXQoJz0nKS5maXJzdCgpKTogaXQuc3BsaXQoJz0nKS5sYXN0KCldfQpwcmludGxuIG1hcC50b2tlbgpwcmludGxuIG1hcC52YWx1ZQ==