Mostly get rid of ioutil

dnscrypt-proxy/common.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"encoding/binary"
 	"errors"
-	"io/ioutil"
 	"net"
 	"os"
 	"strconv"
@@ -161,7 +160,7 @@ func ExtractHostAndPort(str string, defaultPort int) (host string, port int) {
 }
 
 func ReadTextFile(filename string) (string, error) {
-	bin, err := ioutil.ReadFile(filename)
+	bin, err := os.ReadFile(filename)
 	if err != nil {
 		return "", err
 	}

dnscrypt-proxy/local-doh.go

@@ -4,7 +4,6 @@ import (
 	"encoding/base64"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net"
 	"net/http"
 	"strings"
@@ -36,7 +35,7 @@ func (handler localDoHHandler) ServeHTTP(writer http.ResponseWriter, request *ht
 	start := time.Now()
 	if request.Method == "POST" &&
 		request.Header.Get("Content-Type") == dataType {
-		packet, err = ioutil.ReadAll(io.LimitReader(request.Body, int64(MaxDNSPacketSize)))
+		packet, err = io.ReadAll(io.LimitReader(request.Body, int64(MaxDNSPacketSize)))
 		if err != nil {
 			dlog.Warnf("No body in a local DoH query")
 			return

dnscrypt-proxy/sources.go

@@ -3,7 +3,6 @@ package main
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
 	"math/rand"
 	"net/url"
 	"os"
@@ -54,10 +53,10 @@ var timeNow = time.Now
 
 func (source *Source) fetchFromCache(now time.Time) (delay time.Duration, err error) {
 	var bin, sig []byte
-	if bin, err = ioutil.ReadFile(source.cacheFile); err != nil {
+	if bin, err = os.ReadFile(source.cacheFile); err != nil {
 		return
 	}
-	if sig, err = ioutil.ReadFile(source.cacheFile + ".minisig"); err != nil {
+	if sig, err = os.ReadFile(source.cacheFile + ".minisig"); err != nil {
 		return
 	}
 	if err = source.checkSignature(bin, sig); err != nil {

dnscrypt-proxy/sources_test.go

@@ -69,7 +69,7 @@ type SourceTestExpect struct {
 }
 
 func readFixture(t *testing.T, name string) []byte {
-	bin, err := ioutil.ReadFile(filepath.Join("testdata", name))
+	bin, err := os.ReadFile(filepath.Join("testdata", name))
 	if err != nil {
 		t.Fatalf("Unable to read test fixture %s: %v", name, err)
 	}
@@ -86,7 +86,7 @@ func writeSourceCache(t *testing.T, e *SourceTestExpect) {
 		if perms == 0 {
 			perms = 0644
 		}
-		if err := ioutil.WriteFile(path, f.content, perms); err != nil {
+		if err := os.WriteFile(path, f.content, perms); err != nil {
 			t.Fatalf("Unable to write cache file %s: %v", path, err)
 		}
 		if err := acl.Chmod(path, perms); err != nil {
@@ -109,7 +109,7 @@ func checkSourceCache(c *check.C, e *SourceTestExpect) {
 	for _, f := range e.cache {
 		path := e.cachePath + f.suffix
 		_ = acl.Chmod(path, 0644) // don't worry if this fails, reading it will catch the same problem
-		got, err := ioutil.ReadFile(path)
+		got, err := os.ReadFile(path)
 		c.DeepEqual(got, f.content, "Unexpected content for cache file '%s', err %v", path, err)
 		if f.suffix != "" {
 			continue

dnscrypt-proxy/xtransport.go

@@ -10,11 +10,11 @@ import (
 	"encoding/hex"
 	"errors"
 	"io"
-	"io/ioutil"
 	"math/rand"
 	"net"
 	"net/http"
 	"net/url"
+	"os"
 	"strconv"
 	"strings"
 	"sync"
@@ -179,7 +179,7 @@ func (xTransport *XTransport) rebuildTransport() {
 		if certPool == nil {
 			dlog.Fatalf("Additional CAs not supported on this platform: %v", certPoolErr)
 		}
-		additionalCaCert, err := ioutil.ReadFile(clientCreds.rootCA)
+		additionalCaCert, err := os.ReadFile(clientCreds.rootCA)
 		if err != nil {
 			dlog.Fatal(err)
 		}
@@ -470,7 +470,7 @@ func (xTransport *XTransport) Fetch(
 	}
 	if body != nil {
 		req.ContentLength = int64(len(*body))
-		req.Body = ioutil.NopCloser(bytes.NewReader(*body))
+		req.Body = io.NopCloser(bytes.NewReader(*body))
 	}
 	start := time.Now()
 	resp, err := client.Do(req)
@@ -528,7 +528,7 @@ func (xTransport *XTransport) Fetch(
 		}
 	}
 	tls := resp.TLS
-	bin, err := ioutil.ReadAll(io.LimitReader(resp.Body, MaxHTTPBodyLength))
+	bin, err := io.ReadAll(io.LimitReader(resp.Body, MaxHTTPBodyLength))
 	if err != nil {
 		return nil, statusCode, tls, rtt, err
 	}