130 lines
2.8 KiB
Go
130 lines
2.8 KiB
Go
package exprhelpers
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import (
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"bufio"
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"fmt"
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"net"
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"os"
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"path"
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"regexp"
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"strconv"
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"strings"
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log "github.com/sirupsen/logrus"
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)
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var dataFile map[string][]string
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var dataFileRegex map[string][]*regexp.Regexp
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func Atof(x string) float64 {
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log.Debugf("debug atof %s", x)
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ret, err := strconv.ParseFloat(x, 64)
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if err != nil {
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log.Warningf("Atof : can't convert float '%s' : %v", x, err)
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}
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return ret
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}
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func Upper(s string) string {
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return strings.ToUpper(s)
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}
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func GetExprEnv(ctx map[string]interface{}) map[string]interface{} {
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var ExprLib = map[string]interface{}{
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"Atof": Atof,
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"JsonExtract": JsonExtract,
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"JsonExtractLib": JsonExtractLib,
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"File": File,
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"RegexpInFile": RegexpInFile,
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"Upper": Upper,
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"IpInRange": IpInRange,
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}
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for k, v := range ctx {
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ExprLib[k] = v
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}
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return ExprLib
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}
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func Init() error {
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dataFile = make(map[string][]string)
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dataFileRegex = make(map[string][]*regexp.Regexp)
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return nil
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}
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func FileInit(fileFolder string, filename string, fileType string) error {
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log.Debugf("init (folder:%s) (file:%s) (type:%s)", fileFolder, filename, fileType)
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filepath := path.Join(fileFolder, filename)
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file, err := os.Open(filepath)
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if err != nil {
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return err
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}
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defer file.Close()
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if _, ok := dataFile[filename]; !ok {
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dataFile[filename] = []string{}
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}
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if fileType == "" {
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fileType = "string"
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}
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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if strings.HasPrefix(scanner.Text(), "#") { // allow comments
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continue
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}
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switch fileType {
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case "regex", "regexp":
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dataFileRegex[filename] = append(dataFileRegex[filename], regexp.MustCompile(scanner.Text()))
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case "string":
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dataFile[filename] = append(dataFile[filename], scanner.Text())
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default:
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return fmt.Errorf("unknown data type '%s' for : '%s'", fileType, filename)
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}
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}
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if err := scanner.Err(); err != nil {
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return err
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}
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return nil
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}
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func File(filename string) []string {
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if _, ok := dataFile[filename]; ok {
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return dataFile[filename]
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}
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log.Errorf("file '%s' (type:string) not found in expr library", filename)
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return []string{}
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}
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func RegexpInFile(data string, filename string) bool {
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if _, ok := dataFileRegex[filename]; ok {
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for _, re := range dataFileRegex[filename] {
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if re.Match([]byte(data)) {
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return true
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}
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}
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} else {
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log.Errorf("file '%s' (type:regexp) not found in expr library", filename)
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}
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return false
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}
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func IpInRange(ip string, ipRange string) bool {
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var err error
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var ipParsed net.IP
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var ipRangeParsed *net.IPNet
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ipParsed = net.ParseIP(ip)
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if ipParsed == nil {
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log.Errorf("'%s' is not a valid IP", ip)
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return false
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}
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if _, ipRangeParsed, err = net.ParseCIDR(ipRange); err != nil {
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log.Errorf("'%s' is not a valid IP Range", ipRange)
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return false
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}
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if ipRangeParsed.Contains(ipParsed) {
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return true
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}
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return false
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}
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