refactor: move from io/ioutil to io and os packages (#5266)

The io/ioutil package has been deprecated as of Go 1.16 [1]. This commit
replaces the existing io/ioutil functions with their new definitions in
io and os packages.

[1]: https://golang.org/doc/go1.16#ioutil
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

pkg/models/devops/devops.go

@@ -22,7 +22,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"sort"
 	"strings"
@@ -306,7 +305,7 @@ func (d devopsOperator) ListPipelineObj(projectName string, filterFunc PipelineF
 	return api.ListResult{TotalItems: len(result), Items: items}, nil
 }
 
-//credentialobj in crd
+// credentialobj in crd
 func (d devopsOperator) CreateCredentialObj(projectName string, secret *v1.Secret) (*v1.Secret, error) {
 	projectObj, err := d.ksInformers.Devops().V1alpha3().DevOpsProjects().Lister().Get(projectName)
 	if err != nil {
@@ -837,7 +836,7 @@ func (d devopsOperator) GetOrgRepo(scmId, organizationId string, req *http.Reque
 // CreateSCMServers creates a Bitbucket server config item in Jenkins configuration if there's no same API address exist
 func (d devopsOperator) CreateSCMServers(scmId string, req *http.Request) (*devops.SCMServer, error) {
 
-	requestBody, err := ioutil.ReadAll(req.Body)
+	requestBody, err := io.ReadAll(req.Body)
 	if err != nil {
 		klog.Error(err)
 		return nil, err
@@ -861,7 +860,7 @@ func (d devopsOperator) CreateSCMServers(scmId string, req *http.Request) (*devo
 			return &server, nil
 		}
 	}
-	req.Body = ioutil.NopCloser(bytes.NewReader(requestBody))
+	req.Body = io.NopCloser(bytes.NewReader(requestBody))
 
 	req.Method = http.MethodPost
 	resBody, err := d.devopsClient.CreateSCMServers(scmId, convertToHttpParameters(req))
@@ -977,7 +976,7 @@ func getInputReqBody(reqBody io.ReadCloser) (newReqBody io.ReadCloser, err error
 		Abort      bool                             `json:"abort,omitempty" description:"abort or not"`
 	}
 
-	Body, err := ioutil.ReadAll(reqBody)
+	Body, err := io.ReadAll(reqBody)
 	if err != nil {
 		klog.Error(err)
 		return nil, err
@@ -1002,7 +1001,7 @@ func getInputReqBody(reqBody io.ReadCloser) (newReqBody io.ReadCloser, err error
 func parseBody(body io.Reader) (newReqBody io.ReadCloser) {
 	rc, ok := body.(io.ReadCloser)
 	if !ok && body != nil {
-		rc = ioutil.NopCloser(body)
+		rc = io.NopCloser(body)
 	}
 	return rc
 }

pkg/models/kubeconfig/kubeconfig.go

@@ -23,7 +23,7 @@ import (
 	"crypto/x509"
 	"encoding/pem"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"time"
 
 	corev1listers "k8s.io/client-go/listers/core/v1"
@@ -102,7 +102,7 @@ func (o *operator) CreateKubeConfig(user *iamv1alpha2.User) error {
 	if len(o.config.CAData) > 0 {
 		ca = o.config.CAData
 	} else {
-		ca, err = ioutil.ReadFile(inClusterCAFilePath)
+		ca, err = os.ReadFile(inClusterCAFilePath)
 		if err != nil {
 			klog.Errorln(err)
 			return err

pkg/models/monitoring/sort_page_test.go

@@ -18,8 +18,8 @@ package monitoring
 
 import (
 	"fmt"
-	"io/ioutil"
 	"math"
+	"os"
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
@@ -161,7 +161,7 @@ func jsonFromFile(sourceFile, expectedFile string) (*Metrics, *Metrics, error) {
 	sourceJson := &Metrics{}
 	expectedJson := &Metrics{}
 
-	json, err := ioutil.ReadFile(fmt.Sprintf("./testdata/%s", sourceFile))
+	json, err := os.ReadFile(fmt.Sprintf("./testdata/%s", sourceFile))
 	if err != nil {
 		return nil, nil, err
 	}
@@ -170,7 +170,7 @@ func jsonFromFile(sourceFile, expectedFile string) (*Metrics, *Metrics, error) {
 		return nil, nil, err
 	}
 
-	json, err = ioutil.ReadFile(fmt.Sprintf("./testdata/%s", expectedFile))
+	json, err = os.ReadFile(fmt.Sprintf("./testdata/%s", expectedFile))
 	if err != nil {
 		return nil, nil, err
 	}

pkg/models/notification/notification.go

@@ -21,7 +21,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"reflect"
 
@@ -524,7 +523,7 @@ func (o *operator) Verify(request *restful.Request, response *restful.Response)
 		return
 	}
 
-	reqBody, err := ioutil.ReadAll(request.Request.Body)
+	reqBody, err := io.ReadAll(request.Request.Body)
 	if err != nil {
 		klog.Error(err)
 		_ = response.WriteHeaderAndEntity(http.StatusBadRequest, err)

pkg/models/registries/registry_client.go

@@ -22,7 +22,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/url"
 	"regexp"
@@ -179,7 +178,7 @@ func GetRespBody(resp *http.Response) ([]byte, error) {
 	} else {
 		reader = resp.Body
 	}
-	resBody, err := ioutil.ReadAll(reader)
+	resBody, err := io.ReadAll(reader)
 	if err != nil {
 		log.Error(err)
 		return nil, err

pkg/models/routers/routers.go

@@ -19,7 +19,7 @@ package routers
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"sort"
 	"strings"
 
@@ -170,7 +170,7 @@ func (c *routerOperator) getRouterService(namespace string) (*corev1.Service, er
 // Load all resource yamls
 func loadYamls() ([]string, error) {
 	var yamls []string
-	files, err := ioutil.ReadDir(ingressControllerFolder)
+	files, err := os.ReadDir(ingressControllerFolder)
 	if err != nil {
 		klog.Warning(err)
 		return nil, err
@@ -180,7 +180,7 @@ func loadYamls() ([]string, error) {
 		if file.IsDir() || !strings.HasSuffix(file.Name(), ".yaml") {
 			continue
 		}
-		content, err := ioutil.ReadFile(ingressControllerFolder + "/" + file.Name())
+		content, err := os.ReadFile(ingressControllerFolder + "/" + file.Name())
 
 		if err != nil {
 			klog.Error(err)