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package filter
import (
"encoding/json"
"fmt"
"regexp"
"strings"
"github.com/ffuf/ffuf/v2/pkg/ffuf"
)
type RegexpFilter struct {
Value *regexp.Regexp
valueRaw string
}
func NewRegexpFilter(value string) (ffuf.FilterProvider, error) {
re, err := regexp.Compile(value)
if err != nil {
return &RegexpFilter{}, fmt.Errorf("Regexp filter or matcher (-fr / -mr): invalid value: %s", value)
}
return &RegexpFilter{Value: re, valueRaw: value}, nil
}
func (f *RegexpFilter) MarshalJSON() ([]byte, error) {
return json.Marshal(&struct {
Value string `json:"value"`
}{
Value: f.valueRaw,
})
}
func (f *RegexpFilter) Filter(response *ffuf.Response) (bool, error) {
matchheaders := ""
for k, v := range response.Headers {
for _, iv := range v {
matchheaders += k + ": " + iv + "\r\n"
}
}
matchdata := []byte(matchheaders)
matchdata = append(matchdata, response.Data...)
pattern := f.valueRaw
for keyword, inputitem := range response.Request.Input {
pattern = strings.ReplaceAll(pattern, keyword, regexp.QuoteMeta(string(inputitem)))
}
matched, err := regexp.Match(pattern, matchdata)
if err != nil {
return false, nil
}
return matched, nil
}
func (f *RegexpFilter) Repr() string {
return f.valueRaw
}
func (f *RegexpFilter) ReprVerbose() string {
return fmt.Sprintf("Regexp: %s", f.valueRaw)
}
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