Fetching github payload in jenkinsfile - jenkins

Question

Need some help on fetching the GitHub payload into the Jenkins file without installing any plugin.
If anyone can provide the Jenkins file code snippet to access the GitHub payload from the webhook. it would be of great help.
I am able to call the Jenkins job from GitHub webhook. but need the payload as well to process further.
Any help would be appreciated. Thanks.

Answer 1

Please find the below groovy script:
stage('Pull Request Info') {
agent {
docker {
image 'maven'
args '-v $HOME/.m2:/home/jenkins/.m2 -ti -u 496 -e MAVEN_CONFIG=/home/jenkins/.m2 -e MAVEN_OPTS=-Xmx2048m'
}
}
steps {
script {
withCredentials([usernameColonPassword(credentialsId: "${env.STASH_CREDENTIAL_ID}",
variable: 'USERPASS')]) {
def hasChanges = maven.updateDependencies()
if (hasChanges != '') {
def pr1 = sh(
script: "curl -s -u ${"$USERPASS" } -H 'Content-Type: application/json' https://xx.example/rest/some/endpoint",
returnStdout: true
)
def pr = readJSON(text: pr1)
println pr.fromRef
}
}
}
}
}
Above script uses, curl to fetch the details about Pull request. I have stored the credentials in the jenkins and created an environment variable for the credentialId.
You can replace the url with your endpoint. You can also modify the script to use jq if you have jq installed in the machine.
In this case, I'm using readJSON to parse the JSON which is part of pipeline utilities plugin. My question would be, why not use the plugin as it provides the needed functionalities?
If you still dont want to use plugin, take a look at json parsing with groovy.