[Web Payments] Common Payments validation

components/payments/payments_validators.cc

+// 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.
+
+#include "components/payments/payments_validators.h"
+
+namespace payments {
+
+// We limit the maximum length of the currency code to 2048 bytes for security
+// reasons.
+static const int maxCurrencyCodeLength = 2048;
+
+bool PaymentsValidators::isValidCurrencyCodeFormat(
+    const std::string& code,
+    std::string* optionalErrorMessage) {
+  if (code.size() <= maxCurrencyCodeLength)
+    return true;
+
+  if (optionalErrorMessage)
+    *optionalErrorMessage =
+        "The currency code should be at most 2048 characters long";
+
+  return false;
+}
+
+bool PaymentsValidators::isValidAmountFormat(
+    const std::string& amount,
+    std::string* optionalErrorMessage) {
+  //    if (ScriptRegexp("^-?[0-9]+(\\.[0-9]+)?$",

[please use gerrit instead, 2016/10/28 18:38:58]

Can you use https://cs.chromium.org/chromium/src/third_party/re2/ to revive this
validator?

[Kevin Bailey, 2016/10/28 20:53:05]

Done. (Sorry if I nuked it.) But there was a problem here. In spite of adding
the dependency to BUILD.gn, and something to DEPS, the presubmit still
complained that I was evil for trying to use re2. Could you glance at the new
changes and see if you see anything missing? thx

[please use gerrit instead, 2016/10/31 13:17:33]

Seems that "re2" dependency was added to components/payments/android/DEPS, but
should be in components/payments/DEPS. if that still does not work, try changing
the dependency from "re2" to "third_party/re2" (i.e., full path).

[Kevin Bailey, 2016/10/31 14:10:03]

Ya, it required the full path.

+  //    TextCaseSensitive).match(amount) == 0)
+  //        return true;
+
+  if (optionalErrorMessage)
+    *optionalErrorMessage = "'" + amount + "' is not a valid amount format";
+
+  return false;
+}
+
+}  // namespace payments