toggle-jenkins-node-status.ps1

$API_User = "user"
$API_Pass = "password"
$API_URL = "http://jenkins-host"
$API_Port = "8082"
$API_NODE= "node-name"
$API_MESSAGE= "bye!"
$CRUMB_URI = "${API_URL}:${API_Port}/jenkins/crumbIssuer/api/json"

Write-Host "getting crumb from '$CRUMB_URI'"

$h = @{}
$h.Add('Authorization', 'Basic ' + [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes("$(${API_User}):$(${API_Pass})")))

$Params = @{uri = $CRUMB_URI;
        Method = 'Get';
        Headers = $h;}
$API_Crumb = Invoke-RestMethod @Params

$h.Add('Jenkins-Crumb', $API_Crumb.crumb)
$Params['uri'] = "${API_URL}:${API_Port}/jenkins/computer/${API_NODE}/toggleOffline?offlineMessage=${API_MESSAGE}"
$Params['Method'] = 'Post'
$Params['Headers'] = $h

Invoke-RestMethod @Params