[Autofill] Credit Card validation for rAc.

chrome/browser/autofill/validation.cc

 // Copyright (c) 2013 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 "chrome/browser/autofill/validation.h"
 
 #include "base/string_util.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/time.h"
+#include "base/utf_string_conversions.h"
 #include "chrome/browser/autofill/credit_card.h"
 
 namespace autofill {
 
 bool IsValidCreditCardNumber(const string16& text) {
   string16 number = CreditCard::StripSeparators(text);
 
   // Credit card numbers are at most 19 digits in length [1]. 12 digits seems to
   // be a fairly safe lower-bound [2].
   // [1] http://www.merriampark.com/anatomycc.htm
@@ skipping 20 matching lines @@
       sum += digit / 10 + digit % 10;
     } else {
       sum += digit;
     }
     odd = !odd;
   }
 
   return (sum % 10) == 0;
 }
 
+bool IsValidCreditCardExpirationYear(const string16& text,
+                                     size_t num_digits,
+                                     const base::Time& now) {
+  return IsValidCreditCardExpirationDate(ASCIIToUTF16("12/")+text,
+                                         num_digits,
+                                         now);
+}
+
+bool IsValidCreditCardExpirationDate(const string16& text,
+                                     size_t num_digits,
+                                     const base::Time& now) {
+  DCHECK(num_digits == 2 || num_digits == 4);
+  const char16 kSeparatorSlash = '/';
+  const char16 kSeparatorDash = '-';
+
+  // A date string has |num_digits| chars for year, 2 for month, 1 separator.
+  if (text.length() != num_digits + 3)
+    return false;
+
+  string16 year_text, month_text;
+  size_t separator = text.find(kSeparatorSlash);

[Evan Stade, 2013/02/08 15:48:14]

Seems like you're doing a lot of work to parse something g that should be in a
very predictable format and not need parsing (since it comes from a combobox)

[groby-ooo-7-16, 2013/02/09 00:01:49]

Killing it, since we don't validate fields of that type.
On 2013/02/08 15:48:14, Evan Stade wrote:

+  if (separator == 2) {
+    year_text = text.substr(separator+1);

[Evan Stade, 2013/02/08 15:48:14]

Spaces around operators.

[groby-ooo-7-16, 2013/02/09 00:01:49]

It's dead, Jim.
On 2013/02/08 15:48:14, Evan Stade wrote:

+    month_text = text.substr(0,2);
+  } else {
+    separator = text.find(kSeparatorDash);
+    if (separator != num_digits)
+      return false;
+    year_text = text.substr(0, num_digits);
+    month_text = text.substr(separator+1);
+  }
+
+  base::Time::Exploded now_exploded;
+  now.LocalExplode(&now_exploded);
+  size_t current_year = size_t(now_exploded.year);
+  size_t current_month = size_t(now_exploded.month);
+  if (num_digits == 2)
+    current_year = current_year % 100;
+
+  size_t year;
+  if (!base::StringToSizeT(year_text, &year))
+    return false;
+  if (year < current_year)
+    return false;
+
+  size_t month;
+  if (!base::StringToSizeT(month_text, &month))
+    return false;
+  if (year == current_year && month < current_month)
+    return false;
+
+  return true;
+}
+
+bool IsValidCreditCardCSC(const string16& text) {
+  if (text.size() < 3U || text.size() > 4U)
+    return false;
+
+  for (string16::const_iterator iter = text.begin();
+       iter != text.end();
+       ++iter) {
+    if (!IsAsciiDigit(*iter))
+      return false;
+  }
+  return true;
+}
+
 }  // namespace autofill