jenkins script create credentials with json string

jenkins_script_create_credentials_from_json_str.groovy

import com.cloudbees.plugins.credentials.impl.*
import com.cloudbees.plugins.credentials.*
import com.cloudbees.plugins.credentials.domains.*
import com.cloudbees.jenkins.plugins.sshcredentials.impl.*
import groovy.json.JsonSlurper

def createCredentialsByJsonStr(credsJsonStr) {
    jsonSlurper = new JsonSlurper()
    creds = jsonSlurper.parseText(credsJsonStr)
    creds.each{cred->
        Credentials c
        attrs = cred['attrs']
        if (cred['type'] == 'UsernamePasswordCredentialsImpl') {
            c = (Credentials) new UsernamePasswordCredentialsImpl(CredentialsScope.GLOBAL, attrs['id'], attrs['desc'], attrs['username'], attrs['password']['plainText'])
        } else if (cred['type'] == 'BasicSSHUserPrivateKey') {
            BasicSSHUserPrivateKey.DirectEntryPrivateKeySource storeSource = new BasicSSHUserPrivateKey.DirectEntryPrivateKeySource(attrs['privateKey'])
            c = new BasicSSHUserPrivateKey(CredentialsScope.GLOBAL, attrs['id'], attrs['username'], storeSource, attrs['passphrase'], attrs['desc'])
        }
        SystemCredentialsProvider.getInstance().getStore().addCredentials(Domain.global(), c)  
    }
}