https://github.com/jenkinsci/subversion-plugin/blob/2eba78759fdb9b75a31a3d0f209fac67dba2f0f8/src/main/resources/hudson/scm/SubversionSCM/DescriptorImpl/credentialOK.jelly#L34
https://www.jenkins.io/doc/developer/security/csp/#inline-event-handlers
jenkinsci/subversion-plugin/pull/321