Validate saved credit card number in interactive autocomplete

components/autofill/core/browser/validation.cc

 // Copyright 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 "components/autofill/core/browser/validation.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 15 matching lines @@
 
 bool IsValidCreditCardExpirationDate(const base::string16& year,
                                      const base::string16& month,
                                      const base::Time& now) {
   base::string16 year_cleaned, month_cleaned;
   TrimWhitespace(year, TRIM_ALL, &year_cleaned);
   TrimWhitespace(month, TRIM_ALL, &month_cleaned);
   if (year_cleaned.length() != 4)
     return false;
 
+  int cc_year;
+  if (!base::StringToInt(year_cleaned, &cc_year))
+    return false;
+
+  int cc_month;
+  if (!base::StringToInt(month_cleaned, &cc_month))
+    return false;
+
+  return IsValidCreditCardExpirationDate(cc_year, cc_month, now);
+}
+
+bool IsValidCreditCardExpirationDate(int year,
+                                     int month,
+                                     const base::Time& now) {
   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);
 
-  size_t cc_year;
-  if (!base::StringToSizeT(year_cleaned, &cc_year))
-    return false;
-  if (cc_year < current_year)
+  if (year < now_exploded.year)
     return false;
 
-  size_t cc_month;
-  if (!base::StringToSizeT(month_cleaned, &cc_month))
-    return false;
-  if (cc_year == current_year && cc_month < current_month)
+  if (year == now_exploded.year && month < now_exploded.month)
     return false;
 
   return true;
 }
 
 bool IsValidCreditCardNumber(const base::string16& text) {
   base::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].
@@ skipping 126 matching lines @@
                                        number_string.begin() + 9),
                          &serial)
       || serial == 0) {
     return false;
   }
 
   return true;
 }
 
 }  // namespace autofill