[#196] Add PutObjectTagging

Signed-off-by: Denis Kirillov <denis@nspcc.ru>

api/handler/tagging.go

@@ -0,0 +1,107 @@
+package handler
+
+import (
+	"encoding/xml"
+	"net/http"
+	"strings"
+	"unicode"
+
+	"github.com/nspcc-dev/neofs-s3-gw/api"
+	"github.com/nspcc-dev/neofs-s3-gw/api/errors"
+	"github.com/nspcc-dev/neofs-s3-gw/api/layer"
+)
+
+const (
+	allowedTagChars = "+-=._:/@"
+
+	keyTagMaxLength   = 128
+	valueTagMaxLength = 256
+)
+
+func (h *handler) PutObjectTaggingHandler(w http.ResponseWriter, r *http.Request) {
+	reqInfo := api.GetReqInfo(r.Context())
+
+	tagging := new(Tagging)
+	if err := xml.NewDecoder(r.Body).Decode(tagging); err != nil {
+		h.logAndSendError(w, "could not decode body", reqInfo, errors.GetAPIError(errors.ErrMalformedXML))
+		return
+	}
+
+	if err := checkTagSet(tagging.TagSet); err != nil {
+		h.logAndSendError(w, "some tags are invalid", reqInfo, err)
+		return
+	}
+
+	p := &layer.HeadObjectParams{
+		Bucket:    reqInfo.BucketName,
+		Object:    reqInfo.ObjectName,
+		VersionID: reqInfo.URL.Query().Get("versionId"),
+	}
+
+	objInfo, err := h.obj.GetObjectInfo(r.Context(), p)
+	if err != nil {
+		h.logAndSendError(w, "could not get object info", reqInfo, err)
+		return
+	}
+
+	tagSet := make(map[string]string, len(tagging.TagSet))
+	for _, tag := range tagging.TagSet {
+		tagSet[tag.Key] = tag.Value
+	}
+
+	p2 := &layer.PutTaggingParams{
+		ObjectInfo: objInfo,
+		TagSet:     tagSet,
+	}
+
+	if err = h.obj.PutObjectTagging(r.Context(), p2); err != nil {
+		h.logAndSendError(w, "could not put object tagging", reqInfo, err)
+		return
+	}
+}
+
+func checkTagSet(tagSet []Tag) error {
+	if len(tagSet) > 10 {
+		return errors.GetAPIError(errors.ErrInvalidTag)
+	}
+
+	for _, tag := range tagSet {
+		if err := checkTag(tag); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func checkTag(tag Tag) error {
+	if len(tag.Key) < 1 || len(tag.Key) > keyTagMaxLength {
+		return errors.GetAPIError(errors.ErrInvalidTag)
+	}
+	if len(tag.Value) < 1 || len(tag.Value) > valueTagMaxLength {
+		return errors.GetAPIError(errors.ErrInvalidTag)
+	}
+
+	if strings.HasPrefix(tag.Key, "aws:") {
+		return errors.GetAPIError(errors.ErrInvalidTag)
+	}
+
+	if err := checkCharacters(tag.Key); err != nil {
+		return err
+	}
+	if err := checkCharacters(tag.Value); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func checkCharacters(str string) error {
+	for _, r := range str {
+		if !unicode.IsLetter(r) && !unicode.IsDigit(r) &&
+			!unicode.IsSpace(r) && !strings.ContainsRune(allowedTagChars, r) {
+			return errors.GetAPIError(errors.ErrInvalidTag)
+		}
+	}
+	return nil
+}