Add ExecuteScript function to Jenkins API client

pkg/controller/jenkins/client/script.go

@@ -0,0 +1,45 @@
+package client
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/bndr/gojenkins"
+	"github.com/pkg/errors"
+)
+
+func (jenkins *jenkins) ExecuteScript(script string) (string, error) {
+	now := time.Now().Unix()
+	verifier := fmt.Sprintf("verifier-%d", now)
+	return jenkins.executeScript(script, verifier)
+}
+
+func (jenkins *jenkins) executeScript(script string, verifier string) (string, error) {
+	output := ""
+	fullScript := fmt.Sprintf("%s\nprint println('%s')", script, verifier)
+	parameters := map[string]string{"script": fullScript}
+
+	ar := gojenkins.NewAPIRequest("POST", "/scriptText", nil)
+	if err := jenkins.Requester.SetCrumb(ar); err != nil {
+		return output, err
+	}
+	ar.SetHeader("Content-Type", "application/x-www-form-urlencoded")
+	ar.Suffix = ""
+
+	r, err := jenkins.Requester.Do(ar, &output, parameters)
+	if err != nil {
+		return "", errors.Wrap(err, "couldn't execute groovy script")
+	}
+
+	if r.StatusCode != http.StatusOK {
+		return output, errors.Errorf("invalid status code '%d'", r.StatusCode)
+	}
+
+	if !strings.Contains(output, verifier) {
+		return output, errors.New("script execution failed")
+	}
+
+	return output, nil
+}