Fix BNB name, add coin checks to tokenlist validation and tokenlist pairs check (#17195)

* Fix BNB name, add coin checks to tokenlist validation

* Add tokenlist pairs check

blockchains/binance/info/info.json

@@ -1,5 +1,5 @@
 {
-    "name": "BNB coin",
+    "name": "Binance Chain Native Token",
     "website": "https://binance.org/",
     "description": "Fast and secure decentralized digital asset exchange. The new crypto currency trading standard is here.",
     "explorer": "https://explorer.binance.org/",

internal/processor/validators.go

@@ -342,7 +342,6 @@ func isStackingChain(c coin.Coin) bool {
 	return false
 }
 
-// nolint:funlen
 func (s *Service) ValidateTokenListFile(f *file.AssetFile) error {
 	file, err := os.Open(f.Path())
 	if err != nil {
@@ -361,14 +360,30 @@ func (s *Service) ValidateTokenListFile(f *file.AssetFile) error {
 		return err
 	}
 
+	err = checkTokenListAssets(model, f)
+	if err != nil {
+		return err
+	}
+
+	err = checkTokenListPairs(model)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func checkTokenListAssets(model TokenList, f *file.AssetFile) error {
 	compErr := validation.NewErrComposite()
 
 	for _, token := range model.Tokens {
-		if token.Type == types.Coin {
+		var assetPath string
-			continue
-		}
 
-		assetPath := path.GetAssetInfoPath(f.Chain().Handle, token.Address)
+		if token.Type == types.Coin {
+			assetPath = path.GetChainInfoPath(f.Chain().Handle)
+		} else {
+			assetPath = path.GetAssetInfoPath(f.Chain().Handle, token.Address)
+		}
 
 		infoFile, err := os.Open(assetPath)
 		if err != nil {
@@ -420,6 +435,34 @@ func (s *Service) ValidateTokenListFile(f *file.AssetFile) error {
 	return nil
 }
 
+func checkTokenListPairs(model TokenList) error {
+	compErr := validation.NewErrComposite()
+
+	tokensMap := make(map[string]struct{})
+	for _, t := range model.Tokens {
+		tokensMap[t.Asset] = struct{}{}
+	}
+
+	pairs := make(map[string]string)
+	for _, t := range model.Tokens {
+		for _, pair := range t.Pairs {
+			pairs[pair.Base] = t.Address
+		}
+	}
+
+	for pairToken, token := range pairs {
+		if _, exists := tokensMap[pairToken]; !exists {
+			compErr.Append(fmt.Errorf("token '%s' contains non-existing pair token '%s'", token, pairToken))
+		}
+	}
+
+	if compErr.Len() > 0 {
+		return compErr
+	}
+
+	return nil
+}
+
 func (s *Service) ValidateInfoFolder(f *file.AssetFile) error {
 	file, err := os.Open(f.Path())
 	if err != nil {