support tagging based policy conditions (#15763)

cmd/bucket-policy.go

@@ -27,6 +27,7 @@ import (
 
 	jsoniter "github.com/json-iterator/go"
 	miniogopolicy "github.com/minio/minio-go/v7/pkg/policy"
+	"github.com/minio/minio-go/v7/pkg/tags"
 	"github.com/minio/minio/internal/handlers"
 	xhttp "github.com/minio/minio/internal/http"
 	"github.com/minio/minio/internal/logger"
@@ -125,6 +126,20 @@ func getConditionValues(r *http.Request, lc string, username string, claims map[
 
 	cloneHeader := r.Header.Clone()
 
+	if userTags := cloneHeader.Get(xhttp.AmzObjectTagging); userTags != "" {
+		tag, _ := tags.ParseObjectTags(userTags)
+		if tag != nil {
+			tagMap := tag.ToMap()
+			keys := make([]string, 0, len(tagMap))
+			for k, v := range tagMap {
+				args[pathJoin("ExistingObjectTag", k)] = []string{v}
+				args[pathJoin("RequestObjectTag", k)] = []string{v}
+				keys = append(keys, k)
+			}
+			args["RequestObjectTagKeys"] = keys
+		}
+	}
+
 	for _, objLock := range []string{
 		xhttp.AmzObjectLockMode,
 		xhttp.AmzObjectLockLegalHold,
@@ -137,6 +152,9 @@ func getConditionValues(r *http.Request, lc string, username string, claims map[
 	}
 
 	for key, values := range cloneHeader {
+		if strings.EqualFold(key, xhttp.AmzObjectTagging) {
+			continue
+		}
 		if existingValues, found := args[key]; found {
 			args[key] = append(existingValues, values...)
 		} else {