Handle ioutil deprecations (#53526)

* replace ioutil.ReadFile -> os.ReadFile

* replace ioutil.ReadAll -> io.ReadAll

* replace ioutil.TempFile -> os.CreateTemp

* replace ioutil.NopCloser -> io.NopCloser

* replace ioutil.WriteFile -> os.WriteFile

* replace ioutil.TempDir -> os.MkdirTemp

* replace ioutil.Discard -> io.Discard

pkg/infra/httpclient/count_bytes_reader_test.go

@@ -2,7 +2,7 @@ package httpclient
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"strings"
 	"testing"
 
@@ -20,14 +20,14 @@ func TestCountBytesReader(t *testing.T) {
 
 	for index, tc := range tcs {
 		t.Run(fmt.Sprintf("Test CountBytesReader %d", index), func(t *testing.T) {
-			body := ioutil.NopCloser(strings.NewReader(tc.body))
+			body := io.NopCloser(strings.NewReader(tc.body))
 			var actualBytesRead int64
 
 			readCloser := CountBytesReader(body, func(bytesRead int64) {
 				actualBytesRead = bytesRead
 			})
 
-			bodyBytes, err := ioutil.ReadAll(readCloser)
+			bodyBytes, err := io.ReadAll(readCloser)
 			require.NoError(t, err)
 			err = readCloser.Close()
 			require.NoError(t, err)

pkg/infra/httpclient/httpclientprovider/response_limit_middleware_test.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"strings"
 	"testing"
@@ -27,7 +27,7 @@ func TestResponseLimitMiddleware(t *testing.T) {
 	for _, tc := range tcs {
 		t.Run(fmt.Sprintf("Test ResponseLimitMiddleware with limit: %d", tc.limit), func(t *testing.T) {
 			finalRoundTripper := httpclient.RoundTripperFunc(func(req *http.Request) (*http.Response, error) {
-				return &http.Response{StatusCode: http.StatusOK, Request: req, Body: ioutil.NopCloser(strings.NewReader("dummy"))}, nil
+				return &http.Response{StatusCode: http.StatusOK, Request: req, Body: io.NopCloser(strings.NewReader("dummy"))}, nil
 			})
 
 			mw := ResponseLimitMiddleware(tc.limit)
@@ -46,7 +46,7 @@ func TestResponseLimitMiddleware(t *testing.T) {
 			require.NotNil(t, res.Body)
 			require.NoError(t, res.Body.Close())
 
-			bodyBytes, err := ioutil.ReadAll(res.Body)
+			bodyBytes, err := io.ReadAll(res.Body)
 			if err != nil {
 				require.EqualError(t, tc.err, err.Error())
 			} else {

pkg/infra/httpclient/httpclientprovider/testing.go

@@ -2,7 +2,7 @@ package httpclientprovider
 
 import (
 	"bytes"
-	"io/ioutil"
+	"io"
 	"net/http"
 
 	"github.com/grafana/grafana-plugin-sdk-go/backend/httpclient"
@@ -18,7 +18,7 @@ func (c *testContext) createRoundTripper(name string) http.RoundTripper {
 		return &http.Response{
 			StatusCode: http.StatusOK,
 			Request:    req,
-			Body:       ioutil.NopCloser(bytes.NewBufferString("")),
+			Body:       io.NopCloser(bytes.NewBufferString("")),
 		}, nil
 	})
 }

pkg/infra/httpclient/max_bytes_reader_test.go

@@ -3,7 +3,7 @@ package httpclient
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"strings"
 	"testing"
 
@@ -23,10 +23,10 @@ func TestMaxBytesReader(t *testing.T) {
 	}
 	for _, tc := range tcs {
 		t.Run(fmt.Sprintf("Test MaxBytesReader with limit: %d", tc.limit), func(t *testing.T) {
-			body := ioutil.NopCloser(strings.NewReader("dummy"))
+			body := io.NopCloser(strings.NewReader("dummy"))
 			readCloser := MaxBytesReader(body, tc.limit)
 
-			bodyBytes, err := ioutil.ReadAll(readCloser)
+			bodyBytes, err := io.ReadAll(readCloser)
 			if err != nil {
 				require.EqualError(t, tc.err, err.Error())
 			} else {