From 39f323d050335a848c0e4a55b27364fc12994b47 Mon Sep 17 00:00:00 2001
From: Stephan D <sdeshevikh@yandex.ru>
Date: Thu, 11 Dec 2025 23:27:15 +0100
Subject: [PATCH] fixed currency pair validation

---
 .../api/srequest/payment_value_objects.go     | 97 ++++++++-----------
 1 file changed, 41 insertions(+), 56 deletions(-)

diff --git a/api/server/interface/api/srequest/payment_value_objects.go b/api/server/interface/api/srequest/payment_value_objects.go
index f360f12..5b35473 100644
--- a/api/server/interface/api/srequest/payment_value_objects.go
+++ b/api/server/interface/api/srequest/payment_value_objects.go
@@ -20,41 +20,17 @@ type AssetResolver interface {
 // Precompile regex for efficiency.
 var currencySyntax = regexp.MustCompile(`^[A-Z0-9]{2,10}$`)
 
-func ValidateMoney(m *model.Money, assetResolver AssetResolver) error {
-	if m == nil {
-		return merrors.InvalidArgument("money is required", "intent.amount")
-	}
-
-	//
-	// 1) Basic presence
-	//
-	if strings.TrimSpace(m.Amount) == "" {
-		return merrors.InvalidArgument("amount is required", "intent.amount")
-	}
-	if strings.TrimSpace(m.Currency) == "" {
+// ValidateCurrency validates currency syntax and checks dictionary via assetResolver.
+func ValidateCurrency(cur string, assetResolver AssetResolver) error {
+	// Basic presence
+	if strings.TrimSpace(cur) == "" {
 		return merrors.InvalidArgument("currency is required", "intent.currency")
 	}
 
-	//
-	// 2) Validate decimal amount
-	//
-	amount, err := decimal.NewFromString(m.Amount)
-	if err != nil {
-		return merrors.InvalidArgument("invalid decimal amount", "intent.amount")
-	}
+	// Normalize
+	cur = strings.ToUpper(strings.TrimSpace(cur))
 
-	if amount.IsNegative() {
-		return merrors.InvalidArgument("amount must be >= 0", "intent.amount")
-	}
-
-	//
-	// 3) Normalize currency
-	//
-	cur := strings.ToUpper(strings.TrimSpace(m.Currency))
-
-	//
-	// 4) Syntax validation first — reject malformed tickers early
-	//
+	// Syntax check
 	if !currencySyntax.MatchString(cur) {
 		return merrors.InvalidArgument(
 			"invalid currency format (must be A–Z0–9, length 2–10)",
@@ -62,9 +38,7 @@ func ValidateMoney(m *model.Money, assetResolver AssetResolver) error {
 		)
 	}
 
-	//
-	// 5) Dictionary / environment validation
-	//
+	// Dictionary validation
 	if assetResolver == nil {
 		return merrors.InvalidArgument("asset resolver is not configured", "intent.currency")
 	}
@@ -76,37 +50,48 @@ func ValidateMoney(m *model.Money, assetResolver AssetResolver) error {
 	return nil
 }
 
+func ValidateMoney(m *model.Money, assetResolver AssetResolver) error {
+	if m == nil {
+		return merrors.InvalidArgument("money is required", "intent.amount")
+	}
+
+	// 1) Basic presence
+	if strings.TrimSpace(m.Amount) == "" {
+		return merrors.InvalidArgument("amount is required", "intent.amount")
+	}
+
+	// 2) Validate decimal amount
+	amount, err := decimal.NewFromString(m.Amount)
+	if err != nil {
+		return merrors.InvalidArgument("invalid decimal amount", "intent.amount")
+	}
+	if amount.IsNegative() {
+		return merrors.InvalidArgument("amount must be >= 0", "intent.amount")
+	}
+
+	// 3) Validate currency via helper
+	if err := ValidateCurrency(m.Currency, assetResolver); err != nil {
+		return err
+	}
+
+	return nil
+}
+
 type CurrencyPair struct {
 	Base  string `json:"base"`
 	Quote string `json:"quote"`
 }
 
 func (p *CurrencyPair) Validate() error {
-	if p.Base == "" {
-		return merrors.InvalidArgument("base currency is required", "intent.fx.pair.base")
+	if p == nil {
+		return merrors.InvalidArgument("currency pair is required", "currncy_pair")
 	}
-	if p.Quote == "" {
-		return merrors.InvalidArgument("quote currency is required", "intent.fx.pair.quote")
+	if err := ValidateCurrency(p.Base, nil); err != nil {
+		return merrors.InvalidArgument("invalid base currency in pair: "+err.Error(), "currency_pair.base")
 	}
-
-	if len(p.Base) != 3 {
-		return merrors.InvalidArgument("base currency must be 3 letters", "intent.fx.pair.base")
+	if err := ValidateCurrency(p.Quote, nil); err != nil {
+		return merrors.InvalidArgument("invalid quote currency in pair: "+err.Error(), "currency_pair.quote")
 	}
-	if len(p.Quote) != 3 {
-		return merrors.InvalidArgument("quote currency must be 3 letters", "intent.fx.pair.quote")
-	}
-
-	for _, c := range p.Base {
-		if c < 'A' || c > 'Z' {
-			return merrors.InvalidArgument("base currency must be uppercase A-Z", "intent.fx.pair.base")
-		}
-	}
-	for _, c := range p.Quote {
-		if c < 'A' || c > 'Z' {
-			return merrors.InvalidArgument("quote currency must be uppercase A-Z", "intent.fx.pair.quote")
-		}
-	}
-
 	return nil
 }