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match_node.go
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/
match_node.go
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// Copyright (c) Facebook, Inc. and its affiliates.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package nvd
import (
"fmt"
"strings"
"github.com/facebookincubator/nvdtools/cvefeed/nvd/schema"
"github.com/facebookincubator/flog"
"github.com/facebookincubator/nvdtools/wfn"
)
// Matcher returns an object which knows how to match attributes
func nodeMatcher(ID string, node *schema.NVDCVEFeedJSON10DefNode) (wfn.Matcher, error) {
if node == nil {
return nil, fmt.Errorf("%s: node is nil", ID)
}
var ms []wfn.Matcher
for _, match := range node.CPEMatch {
if match != nil {
if m, err := cpeMatcher(ID, match); err == nil {
ms = append(ms, m)
}
}
}
for _, child := range node.Children {
if child != nil {
if m, err := nodeMatcher(ID, child); err == nil {
ms = append(ms, m)
}
}
}
if len(ms) == 0 {
return nil, fmt.Errorf("%s: empty configuration for node", ID)
}
var m wfn.Matcher
switch strings.ToUpper(node.Operator) {
default:
flog.Warningf("%s: unknown operator, defaulting to OR: got %q", ID, node.Operator)
fallthrough
case "OR":
m = wfn.MatchAny(ms...)
case "AND":
m = wfn.MatchAll(ms...)
}
if node.Negate {
m = wfn.DontMatch(m)
}
return m, nil
}