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      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/credit_card_field.h"
      6 
      7 #include <stddef.h>
      8 
      9 #include "base/logging.h"
     10 #include "base/memory/scoped_ptr.h"
     11 #include "base/strings/string16.h"
     12 #include "base/strings/string_util.h"
     13 #include "base/strings/utf_string_conversions.h"
     14 #include "components/autofill/core/browser/autofill_field.h"
     15 #include "components/autofill/core/browser/autofill_regex_constants.h"
     16 #include "components/autofill/core/browser/autofill_scanner.h"
     17 #include "components/autofill/core/browser/field_types.h"
     18 #include "ui/base/l10n/l10n_util.h"
     19 
     20 namespace autofill {
     21 
     22 // static
     23 FormField* CreditCardField::Parse(AutofillScanner* scanner) {
     24   if (scanner->IsEnd())
     25     return NULL;
     26 
     27   scoped_ptr<CreditCardField> credit_card_field(new CreditCardField);
     28   size_t saved_cursor = scanner->SaveCursor();
     29 
     30   // Credit card fields can appear in many different orders.
     31   // We loop until no more credit card related fields are found, see |break| at
     32   // bottom of the loop.
     33   for (int fields = 0; !scanner->IsEnd(); ++fields) {
     34     // Ignore gift card fields.
     35     if (ParseField(scanner, base::UTF8ToUTF16(autofill::kGiftCardRe), NULL))
     36       break;
     37 
     38     // Sometimes the cardholder field is just labeled "name". Unfortunately this
     39     // is a dangerously generic word to search for, since it will often match a
     40     // name (not cardholder name) field before or after credit card fields. So
     41     // we search for "name" only when we've already parsed at least one other
     42     // credit card field and haven't yet parsed the expiration date (which
     43     // usually appears at the end).
     44     if (credit_card_field->cardholder_ == NULL) {
     45       base::string16 name_pattern;
     46       if (fields == 0 || credit_card_field->expiration_month_) {
     47         // at beginning or end
     48         name_pattern = base::UTF8ToUTF16(autofill::kNameOnCardRe);
     49       } else {
     50         name_pattern = base::UTF8ToUTF16(autofill::kNameOnCardContextualRe);
     51       }
     52 
     53       if (ParseField(scanner, name_pattern, &credit_card_field->cardholder_))
     54         continue;
     55 
     56       // As a hard-coded hack for Expedia's billing pages (expedia_checkout.html
     57       // and ExpediaBilling.html in our test suite), recognize separate fields
     58       // for the cardholder's first and last name if they have the labels "cfnm"
     59       // and "clnm".
     60       scanner->SaveCursor();
     61       const AutofillField* first;
     62       if (ParseField(scanner, base::ASCIIToUTF16("^cfnm"), &first) &&
     63           ParseField(scanner, base::ASCIIToUTF16("^clnm"),
     64                      &credit_card_field->cardholder_last_)) {
     65         credit_card_field->cardholder_ = first;
     66         continue;
     67       }
     68       scanner->Rewind();
     69     }
     70 
     71     // Check for a credit card type (Visa, MasterCard, etc.) field.
     72     base::string16 type_pattern = base::UTF8ToUTF16(autofill::kCardTypeRe);
     73     if (!credit_card_field->type_ &&
     74         ParseFieldSpecifics(scanner, type_pattern,
     75                             MATCH_DEFAULT | MATCH_SELECT,
     76                             &credit_card_field->type_)) {
     77       continue;
     78     }
     79 
     80     // We look for a card security code before we look for a credit
     81     // card number and match the general term "number".  The security code
     82     // has a plethora of names; we've seen "verification #",
     83     // "verification number", "card identification number" and others listed
     84     // in the |pattern| below.
     85     base::string16 pattern = base::UTF8ToUTF16(autofill::kCardCvcRe);
     86     if (!credit_card_field->verification_ &&
     87         ParseField(scanner, pattern, &credit_card_field->verification_)) {
     88       continue;
     89     }
     90 
     91     pattern = base::UTF8ToUTF16(autofill::kCardNumberRe);
     92     if (!credit_card_field->number_ &&
     93         ParseField(scanner, pattern, &credit_card_field->number_)) {
     94       continue;
     95     }
     96 
     97     if (LowerCaseEqualsASCII(scanner->Cursor()->form_control_type, "month")) {
     98       credit_card_field->expiration_date_ = scanner->Cursor();
     99       scanner->Advance();
    100     } else {
    101       // First try to parse split month/year expiration fields.
    102       scanner->SaveCursor();
    103       pattern = base::UTF8ToUTF16(autofill::kExpirationMonthRe);
    104       if (!credit_card_field->expiration_month_ &&
    105           ParseFieldSpecifics(scanner, pattern, MATCH_DEFAULT | MATCH_SELECT,
    106                               &credit_card_field->expiration_month_)) {
    107         pattern = base::UTF8ToUTF16(autofill::kExpirationYearRe);
    108         if (ParseFieldSpecifics(scanner, pattern, MATCH_DEFAULT | MATCH_SELECT,
    109                                  &credit_card_field->expiration_year_)) {
    110           continue;
    111         }
    112       }
    113 
    114       // If that fails, try to parse a combined expiration field.
    115       if (!credit_card_field->expiration_date_) {
    116         // Look for a 2-digit year first.
    117         scanner->Rewind();
    118         pattern = base::UTF8ToUTF16(autofill::kExpirationDate2DigitYearRe);
    119         // We allow <select> fields, because they're used e.g. on qvc.com.
    120         if (ParseFieldSpecifics(scanner, pattern,
    121                                 MATCH_LABEL | MATCH_VALUE | MATCH_TEXT |
    122                                     MATCH_SELECT,
    123                                 &credit_card_field->expiration_date_)) {
    124           credit_card_field->is_two_digit_year_ = true;
    125           continue;
    126         }
    127 
    128         pattern = base::UTF8ToUTF16(autofill::kExpirationDateRe);
    129         if (ParseFieldSpecifics(scanner, pattern,
    130                                 MATCH_LABEL | MATCH_VALUE | MATCH_TEXT |
    131                                     MATCH_SELECT,
    132                                 &credit_card_field->expiration_date_)) {
    133           continue;
    134         }
    135       }
    136 
    137       if (credit_card_field->expiration_month_ &&
    138           !credit_card_field->expiration_year_ &&
    139           !credit_card_field->expiration_date_) {
    140         // Parsed a month but couldn't parse a year; give up.
    141         scanner->RewindTo(saved_cursor);
    142         return NULL;
    143       }
    144     }
    145 
    146     // Some pages (e.g. ExpediaBilling.html) have a "card description"
    147     // field; we parse this field but ignore it.
    148     // We also ignore any other fields within a credit card block that
    149     // start with "card", under the assumption that they are related to
    150     // the credit card section being processed but are uninteresting to us.
    151     if (ParseField(scanner, base::UTF8ToUTF16(autofill::kCardIgnoredRe), NULL))
    152       continue;
    153 
    154     break;
    155   }
    156 
    157   // Some pages have a billing address field after the cardholder name field.
    158   // For that case, allow only just the cardholder name field.  The remaining
    159   // CC fields will be picked up in a following CreditCardField.
    160   if (credit_card_field->cardholder_)
    161     return credit_card_field.release();
    162 
    163   // On some pages, the user selects a card type using radio buttons
    164   // (e.g. test page Apple Store Billing.html).  We can't handle that yet,
    165   // so we treat the card type as optional for now.
    166   // The existence of a number or cvc in combination with expiration date is
    167   // a strong enough signal that this is a credit card.  It is possible that
    168   // the number and name were parsed in a separate part of the form.  So if
    169   // the cvc and date were found independently they are returned.
    170   if ((credit_card_field->number_ || credit_card_field->verification_) &&
    171       (credit_card_field->expiration_date_ ||
    172        (credit_card_field->expiration_month_ &&
    173         credit_card_field->expiration_year_))) {
    174     return credit_card_field.release();
    175   }
    176 
    177   scanner->RewindTo(saved_cursor);
    178   return NULL;
    179 }
    180 
    181 CreditCardField::CreditCardField()
    182     : cardholder_(NULL),
    183       cardholder_last_(NULL),
    184       type_(NULL),
    185       number_(NULL),
    186       verification_(NULL),
    187       expiration_month_(NULL),
    188       expiration_year_(NULL),
    189       expiration_date_(NULL),
    190       is_two_digit_year_(false) {
    191 }
    192 
    193 bool CreditCardField::ClassifyField(ServerFieldTypeMap* map) const {
    194   bool ok = AddClassification(number_, CREDIT_CARD_NUMBER, map);
    195   ok = ok && AddClassification(type_, CREDIT_CARD_TYPE, map);
    196   ok = ok && AddClassification(verification_, CREDIT_CARD_VERIFICATION_CODE,
    197                                map);
    198 
    199   // If the heuristics detected first and last name in separate fields,
    200   // then ignore both fields. Putting them into separate fields is probably
    201   // wrong, because the credit card can also contain a middle name or middle
    202   // initial.
    203   if (cardholder_last_ == NULL)
    204     ok = ok && AddClassification(cardholder_, CREDIT_CARD_NAME, map);
    205 
    206   if (expiration_date_) {
    207     if (is_two_digit_year_) {
    208       ok = ok && AddClassification(expiration_date_,
    209                                    CREDIT_CARD_EXP_DATE_2_DIGIT_YEAR, map);
    210     } else {
    211       ok = ok && AddClassification(expiration_date_,
    212                                    CREDIT_CARD_EXP_DATE_4_DIGIT_YEAR, map);
    213     }
    214   } else {
    215     ok = ok && AddClassification(expiration_month_, CREDIT_CARD_EXP_MONTH, map);
    216     if (is_two_digit_year_) {
    217       ok = ok && AddClassification(expiration_year_,
    218                                    CREDIT_CARD_EXP_2_DIGIT_YEAR,
    219                                    map);
    220     } else {
    221       ok = ok && AddClassification(expiration_year_,
    222                                    CREDIT_CARD_EXP_4_DIGIT_YEAR,
    223                                    map);
    224     }
    225   }
    226 
    227   return ok;
    228 }
    229 
    230 }  // namespace autofill
    231