move error parsing for rest to separate func

backend/app/rest/api/rest_private.go

@@ -130,14 +130,9 @@ func (s *Rest) updateCommentCtrl(w http.ResponseWriter, r *http.Request) {
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "invalid comment", rest.ErrCommentValidation)
 		return
 	}
+
 	if err != nil {
-		code := rest.ErrCommentRejected
-		switch {
-		case strings.HasPrefix(err.Error(), "too late to edit"):
-			code = rest.ErrCommentEditExpired
-		case strings.HasPrefix(err.Error(), "parent comment with reply can't be edited"):
-			code = rest.ErrCommentEditChanged
-		}
+		code := s.parseError(err, rest.ErrCommentRejected)
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't update comment", code)
 		return
 	}
@@ -178,17 +173,7 @@ func (s *Rest) voteCtrl(w http.ResponseWriter, r *http.Request) {
 
 	comment, err := s.DataService.Vote(locator, id, user.ID, vote)
 	if err != nil {
-		code := rest.ErrVoteRejected
-		switch {
-		case strings.Contains(err.Error(), "can not vote for his own comment"):
-			code = rest.ErrVoteSelf
-		case strings.Contains(err.Error(), "already voted for"):
-			code = rest.ErrVoteDbl
-		case strings.Contains(err.Error(), "maximum number of votes exceeded for comment"):
-			code = rest.ErrVoteMax
-		case strings.Contains(err.Error(), "minimal score reached for comment"):
-			code = rest.ErrVoteMinScore
-		}
+		code := s.parseError(err, rest.ErrVoteRejected)
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't vote for comment", code)
 		return
 	}
@@ -319,3 +304,28 @@ func (s *Rest) isReadOnly(locator store.Locator) bool {
 	}
 	return s.DataService.IsReadOnly(locator) // ro manually
 }
+
+func (s *Rest) parseError(err error, defaultCode int) (code int) {
+	code = defaultCode
+
+	switch {
+	// voting errors
+	case strings.Contains(err.Error(), "can not vote for his own comment"):
+		code = rest.ErrVoteSelf
+	case strings.Contains(err.Error(), "already voted for"):
+		code = rest.ErrVoteDbl
+	case strings.Contains(err.Error(), "maximum number of votes exceeded for comment"):
+		code = rest.ErrVoteMax
+	case strings.Contains(err.Error(), "minimal score reached for comment"):
+		code = rest.ErrVoteMinScore
+
+	// edit errors
+	case strings.HasPrefix(err.Error(), "too late to edit"):
+		code = rest.ErrCommentEditExpired
+	case strings.HasPrefix(err.Error(), "parent comment with reply can't be edited"):
+		code = rest.ErrCommentEditChanged
+
+	}
+
+	return code
+}

backend/app/rest/api/rest_private_test.go

@@ -10,14 +10,17 @@ import (
 	"mime/multipart"
 	"net/http"
 	"os"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
 
 	"github.com/go-pkgz/lgr"
 	R "github.com/go-pkgz/rest"
+	"github.com/pkg/errors"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"github.com/umputun/remark/backend/app/rest"
 
 	"github.com/umputun/remark/backend/app/store"
 	"github.com/umputun/remark/backend/app/store/image"
@@ -632,3 +635,26 @@ func TestRest_CreateWithPictures(t *testing.T) {
 	_, err = os.Stat("/tmp/remark42/images/" + id3)
 	assert.NoError(t, err, "moved from staging")
 }
+
+func TestRest_parseError(t *testing.T) {
+	tbl := []struct {
+		err error
+		res int
+	}{
+		{errors.New("can not vote for his own comment"), rest.ErrVoteSelf},
+		{errors.New("already voted for"), rest.ErrVoteDbl},
+		{errors.New("maximum number of votes exceeded for comment"), rest.ErrVoteMax},
+		{errors.New("minimal score reached for comment"), rest.ErrVoteMinScore},
+		{errors.New("too late to edit"), rest.ErrCommentEditExpired},
+		{errors.New("parent comment with reply can't be edited"), rest.ErrCommentEditChanged},
+		{errors.New("blah blah"), rest.ErrInternal},
+	}
+
+	svc := Rest{}
+	for n, tt := range tbl {
+		t.Run(strconv.Itoa(n), func(t *testing.T) {
+			res := svc.parseError(tt.err, rest.ErrInternal)
+			assert.Equal(t, tt.res, res)
+		})
+	}
+}