validation.cc revision 010d83a9304c5a91596085d917d248abff47903a 
1// Copyright 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "components/autofill/core/browser/validation.h"
6
7#include "base/strings/string_number_conversions.h"
8#include "base/strings/string_piece.h"
9#include "base/strings/string_util.h"
10#include "base/strings/utf_string_conversions.h"
11#include "base/time/time.h"
12#include "components/autofill/core/browser/autofill_regexes.h"
13#include "components/autofill/core/browser/credit_card.h"
14#include "components/autofill/core/browser/state_names.h"
15
16using base::StringPiece16;
17
18namespace {
19
20// The separator characters for SSNs.
21const base::char16 kSSNSeparators[] = {' ', '-', 0};
22
23}  // namespace
24
25namespace autofill {
26
27bool IsValidCreditCardExpirationDate(const base::string16& year,
28                                     const base::string16& month,
29                                     const base::Time& now) {
30  base::string16 year_cleaned, month_cleaned;
31  base::TrimWhitespace(year, base::TRIM_ALL, &year_cleaned);
32  base::TrimWhitespace(month, base::TRIM_ALL, &month_cleaned);
33  if (year_cleaned.length() != 4)
34    return false;
35
36  int cc_year;
37  if (!base::StringToInt(year_cleaned, &cc_year))
38    return false;
39
40  int cc_month;
41  if (!base::StringToInt(month_cleaned, &cc_month))
42    return false;
43
44  return IsValidCreditCardExpirationDate(cc_year, cc_month, now);
45}
46
47bool IsValidCreditCardExpirationDate(int year,
48                                     int month,
49                                     const base::Time& now) {
50  base::Time::Exploded now_exploded;
51  now.LocalExplode(&now_exploded);
52
53  if (year < now_exploded.year)
54    return false;
55
56  if (year == now_exploded.year && month < now_exploded.month)
57    return false;
58
59  return true;
60}
61
62bool IsValidCreditCardNumber(const base::string16& text) {
63  base::string16 number = CreditCard::StripSeparators(text);
64
65  // Credit card numbers are at most 19 digits in length [1]. 12 digits seems to
66  // be a fairly safe lower-bound [2].  Specific card issuers have more rigidly
67  // defined sizes.
68  // [1] http://www.merriampark.com/anatomycc.htm
69  // [2] http://en.wikipedia.org/wiki/Bank_card_number
70  const std::string type = CreditCard::GetCreditCardType(text);
71  if (type == kAmericanExpressCard && number.size() != 15)
72    return false;
73  if (type == kDinersCard && number.size() != 14)
74    return false;
75  if (type == kDiscoverCard && number.size() != 16)
76    return false;
77  if (type == kJCBCard && number.size() != 16)
78    return false;
79  if (type == kMasterCard && number.size() != 16)
80    return false;
81  if (type == kUnionPay && (number.size() < 16 || number.size() > 19))
82    return false;
83  if (type == kVisaCard && number.size() != 13 && number.size() != 16)
84    return false;
85  if (type == kGenericCard && (number.size() < 12 || number.size() > 19))
86    return false;
87
88  // Unlike all the other supported types, UnionPay cards lack Luhn checksum
89  // validation.
90  if (type == kUnionPay)
91    return true;
92
93  // Use the Luhn formula [3] to validate the number.
94  // [3] http://en.wikipedia.org/wiki/Luhn_algorithm
95  int sum = 0;
96  bool odd = false;
97  for (base::string16::reverse_iterator iter = number.rbegin();
98       iter != number.rend();
99       ++iter) {
100    if (!IsAsciiDigit(*iter))
101      return false;
102
103    int digit = *iter - '0';
104    if (odd) {
105      digit *= 2;
106      sum += digit / 10 + digit % 10;
107    } else {
108      sum += digit;
109    }
110    odd = !odd;
111  }
112
113  return (sum % 10) == 0;
114}
115
116bool IsValidCreditCardSecurityCode(const base::string16& text) {
117  if (text.size() < 3U || text.size() > 4U)
118    return false;
119
120  for (base::string16::const_iterator iter = text.begin();
121       iter != text.end();
122       ++iter) {
123    if (!IsAsciiDigit(*iter))
124      return false;
125  }
126  return true;
127}
128
129bool IsValidCreditCardSecurityCode(const base::string16& code,
130                                   const base::string16& number) {
131  std::string type = CreditCard::GetCreditCardType(number);
132  size_t required_length = 3;
133  if (type == kAmericanExpressCard)
134    required_length = 4;
135
136  return code.length() == required_length;
137}
138
139bool IsValidEmailAddress(const base::string16& text) {
140  // E-Mail pattern as defined by the WhatWG. (4.10.7.1.5 E-Mail state)
141  const base::string16 kEmailPattern = base::ASCIIToUTF16(
142      "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@"
143      "[a-zA-Z0-9-]+(?:\\.[a-zA-Z0-9-]+)*$");
144  return MatchesPattern(text, kEmailPattern);
145}
146
147bool IsValidState(const base::string16& text) {
148  return !state_names::GetAbbreviationForName(text).empty() ||
149         !state_names::GetNameForAbbreviation(text).empty();
150}
151
152bool IsValidZip(const base::string16& text) {
153  const base::string16 kZipPattern = base::ASCIIToUTF16("^\\d{5}(-\\d{4})?$");
154  return MatchesPattern(text, kZipPattern);
155}
156
157bool IsSSN(const base::string16& text) {
158  base::string16 number_string;
159  base::RemoveChars(text, kSSNSeparators, &number_string);
160
161  // A SSN is of the form AAA-GG-SSSS (A = area number, G = group number, S =
162  // serial number). The validation we do here is simply checking if the area,
163  // group, and serial numbers are valid.
164  //
165  // Historically, the area number was assigned per state, with the group number
166  // ascending in an alternating even/odd sequence. With that scheme it was
167  // possible to check for validity by referencing a table that had the highest
168  // group number assigned for a given area number. (This was something that
169  // Chromium never did though, because the "high group" values were constantly
170  // changing.)
171  //
172  // However, starting on 25 June 2011 the SSA began issuing SSNs randomly from
173  // all areas and groups. Group numbers and serial numbers of zero remain
174  // invalid, and areas 000, 666, and 900-999 remain invalid.
175  //
176  // References for current practices:
177  //   http://www.socialsecurity.gov/employer/randomization.html
178  //   http://www.socialsecurity.gov/employer/randomizationfaqs.html
179  //
180  // References for historic practices:
181  //   http://www.socialsecurity.gov/history/ssn/geocard.html
182  //   http://www.socialsecurity.gov/employer/stateweb.htm
183  //   http://www.socialsecurity.gov/employer/ssnvhighgroup.htm
184
185  if (number_string.length() != 9 || !base::IsStringASCII(number_string))
186    return false;
187
188  int area;
189  if (!base::StringToInt(StringPiece16(number_string.begin(),
190                                       number_string.begin() + 3),
191                         &area)) {
192    return false;
193  }
194  if (area < 1 ||
195      area == 666 ||
196      area >= 900) {
197    return false;
198  }
199
200  int group;
201  if (!base::StringToInt(StringPiece16(number_string.begin() + 3,
202                                       number_string.begin() + 5),
203                         &group)
204      || group == 0) {
205    return false;
206  }
207
208  int serial;
209  if (!base::StringToInt(StringPiece16(number_string.begin() + 5,
210                                       number_string.begin() + 9),
211                         &serial)
212      || serial == 0) {
213    return false;
214  }
215
216  return true;
217}
218
219}  // namespace autofill
220