[Web Payments] Common Payments validation

components/payments/payments_validators.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_PAYMENTS_PAYMENTS_VALIDATORS_H_
+#define COMPONENTS_PAYMENTS_PAYMENTS_VALIDATORS_H_
+
+#include <string>
+
+#include "components/payments/payment_request.mojom.h"
+
+namespace payments {
+
+class PaymentsValidators {
+ public:
+  // The most common identifiers are three-letter alphabetic codes as
+  // defined by [ISO4217] (for example, "USD" for US Dollars).  |system| is
+  // a URL that indicates the currency system that the currency identifier
+  // belongs to.  By default, the value is urn:iso:std:iso:4217 indicating
+  // that currency is defined by [[ISO4217]], however any string of at most
+  // 2048 characters is considered valid in other currencySystem.  Returns
+  // false if currency |code| is too long (greater than 2048).
+  static bool isValidCurrencyCodeFormat(const std::string& code,
+                                        const std::string& system,
+                                        std::string* optionalErrorMessage);
+
+  // Returns true if |amount| is a valid currency code as defined in ISO 20022
+  // CurrencyAnd30Amount.
+  static bool isValidAmountFormat(const std::string& amount,
+                                  std::string* optionalErrorMessage);
+};
+
+}  // namespace payments
+
+#endif  // COMPONENTS_PAYMENTS_PAYMENTS_VALIDATORS_H_