refactor(fuzz): use mapsutil.Map type (#5558)

* refactor(fuzz): use `mapsutil.Map` type

Signed-off-by: Dwi Siswanto <git@dw1.io>

* fix(headless): handle empty `key` in `*Value.SetParsedValue`

Signed-off-by: Dwi Siswanto <git@dw1.io>

* feat(fuzz): add type assertion checks

Signed-off-by: Dwi Siswanto <git@dw1.io>

---------

Signed-off-by: Dwi Siswanto <git@dw1.io>

pkg/fuzz/component/path.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/projectdiscovery/nuclei/v3/pkg/fuzz/dataformat"
 	"github.com/projectdiscovery/retryablehttp-go"
+	"github.com/projectdiscovery/utils/maps"
 	urlutil "github.com/projectdiscovery/utils/url"
 )
 
@@ -81,7 +82,7 @@ func (q *Path) Delete(key string) error {
 // Rebuild returns a new request with the
 // component rebuilt
 func (q *Path) Rebuild() (*retryablehttp.Request, error) {
-	originalValues := make(map[string]interface{})
+	originalValues := mapsutil.Map[string, any]{}
 	splitted := strings.Split(q.req.URL.Path, "/")
 	for i := range splitted {
 		pathTillNow := strings.Join(splitted[:i+1], "/")
@@ -95,8 +96,22 @@ func (q *Path) Rebuild() (*retryablehttp.Request, error) {
 	lengthSplitted := len(q.value.parsed.Map)
 	for i := lengthSplitted; i > 0; i-- {
 		key := strconv.Itoa(i)
-		original := originalValues[key].(string)
-		new := q.value.parsed.Map[key].(string)
+
+		original, ok := originalValues.GetOrDefault(key, "").(string)
+		if !ok {
+			continue
+		}
+
+		new, ok := q.value.parsed.Map.GetOrDefault(key, "").(string)
+		if !ok {
+			continue
+		}
+
+		if new == original {
+			// no need to replace
+			continue
+		}
+
 		originalPath = strings.Replace(originalPath, original, new, 1)
 	}
 

pkg/fuzz/component/value.go

@@ -73,12 +73,22 @@ func (v *Value) SetParsed(data dataformat.KV, dataFormat string) {
 
 // SetParsedValue sets the parsed value for a key
 // in the parsed map
-func (v *Value) SetParsedValue(key string, value string) bool {
+func (v *Value) SetParsedValue(key, value string) bool {
+	if key == "" {
+		return false
+	}
+
 	origValue := v.parsed.Get(key)
 	if origValue == nil {
 		v.parsed.Set(key, value)
 		return true
 	}
+
+	// TODO(dwisiswant0): I'm sure that this can be simplified because
+	// `dataformat.KV.*` is a type of `mapsutil.*` where the value is `any`. So,
+	// it looks like we won't type conversion here or even have its own methods
+	// inside `dataformat.KV`.
+
 	// If the value is a list, append to it
 	// otherwise replace it
 	switch v := origValue.(type) {

pkg/fuzz/dataformat/kv.go

@@ -13,7 +13,7 @@ import (
 // if it's not important/significant (ex: json,xml) we use map
 // this also allows us to iteratively implement ordered map
 type KV struct {
-	Map        map[string]interface{}
+	Map        mapsutil.Map[string, any]
 	OrderedMap *mapsutil.OrderedMap[string, any]
 }