[#488] middleware/policy: Add frostfs-to-s3 error transformation

Signed-off-by: Nikita Zinkevich <n.zinkevich@yadro.com>

api/handler/util_test.go

@@ -1,65 +1 @@
 package handler
-
-import (
-	"errors"
-	"fmt"
-	"testing"
-
-	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer/frostfs"
-	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer/tree"
-	"github.com/stretchr/testify/require"
-)
-
-func TestTransformS3Errors(t *testing.T) {
-	for _, tc := range []struct {
-		name     string
-		err      error
-		expected s3errors.ErrorCode
-	}{
-		{
-			name:     "simple std error to internal error",
-			err:      errors.New("some error"),
-			expected: s3errors.ErrInternalError,
-		},
-		{
-			name:     "layer access denied error to s3 access denied error",
-			err:      frostfs.ErrAccessDenied,
-			expected: s3errors.ErrAccessDenied,
-		},
-		{
-			name:     "wrapped layer access denied error to s3 access denied error",
-			err:      fmt.Errorf("wrap: %w", frostfs.ErrAccessDenied),
-			expected: s3errors.ErrAccessDenied,
-		},
-		{
-			name:     "layer node access denied error to s3 access denied error",
-			err:      tree.ErrNodeAccessDenied,
-			expected: s3errors.ErrAccessDenied,
-		},
-		{
-			name:     "layer gateway timeout error to s3 gateway timeout error",
-			err:      frostfs.ErrGatewayTimeout,
-			expected: s3errors.ErrGatewayTimeout,
-		},
-		{
-			name:     "s3 error to s3 error",
-			err:      s3errors.GetAPIError(s3errors.ErrInvalidPart),
-			expected: s3errors.ErrInvalidPart,
-		},
-		{
-			name:     "wrapped s3 error to s3 error",
-			err:      fmt.Errorf("wrap: %w", s3errors.GetAPIError(s3errors.ErrInvalidPart)),
-			expected: s3errors.ErrInvalidPart,
-		},
-	} {
-		t.Run(tc.name, func(t *testing.T) {
-			err := transformToS3Error(tc.err)
-			s3err, ok := err.(s3errors.Error)
-			require.True(t, ok, "error must be s3 error")
-			require.Equalf(t, tc.expected, s3err.ErrCode,
-				"expected: '%s', got: '%s'",
-				s3errors.GetAPIError(tc.expected).Code, s3errors.GetAPIError(s3err.ErrCode).Code)
-		})
-	}
-}