mirror of https://github.com/daffainfo/nuclei.git
70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
package templates
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import (
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"bytes"
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"regexp"
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"strings"
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"github.com/segmentio/ksuid"
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)
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type Preprocessor interface {
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// Process processes the data and returns the processed data.
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Process(data []byte) []byte
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// Exists check if the preprocessor exists in the data.
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Exists(data []byte) bool
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}
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var (
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preprocessorRegex = regexp.MustCompile(`{{([a-z0-9_]+)}}`)
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defaultPreprocessors = []Preprocessor{
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&randStrPreprocessor{},
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}
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)
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func getPreprocessors(preprocessor Preprocessor) []Preprocessor {
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if preprocessor != nil {
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// append() function adds the elements to existing slice if space is available
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// else it creates a new slice and copies the elements to new slice
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// this may cause race-conditions hence we do it explicitly
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tmp := make([]Preprocessor, 0, len(defaultPreprocessors)+1)
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tmp = append(tmp, preprocessor)
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tmp = append(tmp, defaultPreprocessors...)
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return tmp
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}
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return defaultPreprocessors
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}
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var _ Preprocessor = &randStrPreprocessor{}
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type randStrPreprocessor struct{}
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// Process processes the data and returns the processed data.
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func (r *randStrPreprocessor) Process(data []byte) []byte {
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foundMap := make(map[string]struct{})
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for _, expression := range preprocessorRegex.FindAllStringSubmatch(string(data), -1) {
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if len(expression) != 2 {
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continue
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}
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value := expression[1]
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if strings.Contains(value, "(") || strings.Contains(value, ")") {
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continue
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}
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if _, ok := foundMap[value]; ok {
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continue
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}
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foundMap[value] = struct{}{}
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if strings.EqualFold(value, "randstr") || strings.HasPrefix(value, "randstr_") {
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data = bytes.ReplaceAll(data, []byte(expression[0]), []byte(ksuid.New().String()))
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}
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}
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return data
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}
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// Exists check if the preprocessor exists in the data.
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func (r *randStrPreprocessor) Exists(data []byte) bool {
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return bytes.Contains(data, []byte("randstr"))
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}
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