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dictionary.go
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dictionary.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 cvefeed
import (
"errors"
"fmt"
"os"
"strings"
"sync"
)
// Dictionary is a slice of entries
type Dictionary = []CVEItem
// LoadXMLDictionary parses dictionary from multiple NVD vulenrability feed XML files
func LoadXMLDictionary(paths ...string) (Dictionary, error) {
return loadDictionary(loadXMLFile, paths...)
}
// LoadJSONDictionary parses dictionary from multiple NVD vulenrability feed JSON files
func LoadJSONDictionary(paths ...string) (Dictionary, error) {
return loadDictionary(loadJSONFile, paths...)
}
func loadDictionary(loadFunc func(string) (Dictionary, error), paths ...string) (Dictionary, error) {
var dict Dictionary
var wg sync.WaitGroup
done := make(chan struct{})
errDone := make(chan struct{})
dictChan := make(chan Dictionary, 1)
errChan := make(chan error, 1)
for _, path := range paths {
wg.Add(1)
go func(path string) {
defer wg.Done()
feed, err := loadFunc(path)
if err != nil {
errChan <- fmt.Errorf("dictionary: failed to load feed %q: %v", path, err)
return
}
dictChan <- feed
}(path)
}
go func() {
for d := range dictChan {
dict = append(dict, d...)
}
close(done)
}()
var errs []string
go func() {
for e := range errChan {
errs = append(errs, e.Error())
}
close(errDone)
}()
wg.Wait()
close(dictChan)
close(errChan)
<-done
<-errDone
if len(errs) > 0 {
return dict, errors.New(strings.Join(errs, "\n"))
}
return dict, nil
}
// loadXMLFile parses dictionary from NVD vulnerability feed XML file
func loadXMLFile(path string) (Dictionary, error) {
f, err := os.Open(path)
if err != nil {
return nil, fmt.Errorf("dictionary: failed to load feed %q: %v", path, err)
}
defer f.Close()
return ParseXML(f)
}
// loadJSONFile parses dictionary from NVD vulnerability feed XML file
func loadJSONFile(path string) (Dictionary, error) {
f, err := os.Open(path)
if err != nil {
return nil, fmt.Errorf("dictionary: failed to load feed %q: %v", path, err)
}
defer f.Close()
return ParseJSON(f)
}