improve IAM module

Signed-off-by: hongming <talonwan@yunify.com>

vendor/k8s.io/apiserver/pkg/endpoints/handlers/negotiation/negotiate.go

@@ -234,13 +234,6 @@ func acceptMediaTypeOptions(params map[string]string, accepts *runtime.Serialize
 	return options, true
 }
 
-type candidateMediaType struct {
-	accepted *runtime.SerializerInfo
-	clauses  goautoneg.Accept
-}
-
-type candidateMediaTypeSlice []candidateMediaType
-
 // NegotiateMediaTypeOptions returns the most appropriate content type given the accept header and
 // a list of alternatives along with the accepted media type parameters.
 func NegotiateMediaTypeOptions(header string, accepted []runtime.SerializerInfo, endpoint EndpointRestrictions) (MediaTypeOptions, bool) {
@@ -250,25 +243,21 @@ func NegotiateMediaTypeOptions(header string, accepted []runtime.SerializerInfo,
 		}, true
 	}
 
-	var candidates candidateMediaTypeSlice
 	clauses := goautoneg.ParseAccept(header)
-	for _, clause := range clauses {
+	for i := range clauses {
+		clause := &clauses[i]
 		for i := range accepted {
 			accepts := &accepted[i]
 			switch {
 			case clause.Type == accepts.MediaTypeType && clause.SubType == accepts.MediaTypeSubType,
 				clause.Type == accepts.MediaTypeType && clause.SubType == "*",
 				clause.Type == "*" && clause.SubType == "*":
-				candidates = append(candidates, candidateMediaType{accepted: accepts, clauses: clause})
+				if retVal, ret := acceptMediaTypeOptions(clause.Params, accepts, endpoint); ret {
+					return retVal, true
+				}
 			}
 		}
 	}
 
-	for _, v := range candidates {
-		if retVal, ret := acceptMediaTypeOptions(v.clauses.Params, v.accepted, endpoint); ret {
-			return retVal, true
-		}
-	}
-
 	return MediaTypeOptions{}, false
 }