[Web Payments] Common Payments validation

components/payments/payments_validators.h

Index: components/payments/payments_validators.h
diff --git a/components/payments/payments_validators.h b/components/payments/payments_validators.h
new file mode 100644
index 0000000000000000000000000000000000000000..ceb301f20b907a2e37ee710a7b41e030714f662f
--- /dev/null
+++ b/components/payments/payments_validators.h
@@ -0,0 +1,51 @@
+// 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)
+  // however any string of at most 2048 characters is considered valid. Returns
+  // false if currency |code| is too long (greater than 2048).
+  static bool isValidCurrencyCodeFormat(const std::string& code,
+                                        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);
+

[please use gerrit instead, 2016/10/27 17:14:25]

The methods below are not relevant for PaymentDetails validator. Let's not add
them here, or at least not just yet.

[Kevin Bailey, 2016/10/27 22:17:53]

Done.

+  // Returns true if |code| is a valid ISO 3166 country code.
+  static bool isValidCountryCodeFormat(const std::string& code,
+                                       std::string* optionalErrorMessage);
+
+  // Returns true if |code| is a valid ISO 639 language code.
+  static bool isValidLanguageCodeFormat(const std::string& code,
+                                        std::string* optionalErrorMessage);
+
+  // Returns true if |code| is a valid ISO 15924 script code.
+  static bool isValidScriptCodeFormat(const std::string& code,
+                                      std::string* optionalErrorMessage);
+
+  // Returns true if the payment address is valid:
+  //  - Has a valid region code
+  //  - Has a valid language code, if any.
+  //  - Has a valid script code, if any.
+  // A script code should be present only if language code is present.
+  static bool isValidShippingAddress(const blink::mojom::PaymentAddressPtr&,
+                                     std::string* optionalErrorMessage);
+};
+
+}  // namespace payments
+
+#endif  // COMPONENTS_PAYMENTS_PAYMENTS_VALIDATORS_H_