Move from fmt.Errorf to errors.New

In many cases fmt.Errorf is good enough, but since
error is an interface, you can use arbitrary data
structures as error values, to allow callers to
inspect the details of the error.

pkg/utils/crypto/signers/signers.go

@@ -21,6 +21,7 @@ import (
 	"crypto/hmac"
 	"crypto/sha1"
 	"encoding/base64"
+	"errors"
 	"fmt"
 	"io"
 	"net"
@@ -55,7 +56,7 @@ func ValidateRequest(user config.User, req *http.Request) (bool, error) {
 	// Verify if date headers are set, if not reject the request
 	if req.Header.Get("x-amz-date") == "" {
 		if req.Header.Get("Date") == "" {
-			return false, fmt.Errorf("Date should be set")
+			return false, errors.New("Date should be set")
 		}
 	}
 	hm := hmac.New(sha1.New, []byte(user.SecretKey))
@@ -73,7 +74,7 @@ func ValidateRequest(user config.User, req *http.Request) (bool, error) {
 	// fmt.Println("Header calculated: ", authHeader.String())
 	// fmt.Printf("%q : %x", ss, ss)
 	if req.Header.Get("Authorization") != authHeader.String() {
-		return false, fmt.Errorf("Authorization header mismatch")
+		return false, errors.New("Authorization header mismatch")
 	}
 	return true, nil
 }