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// 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/form_field.h"
#include <algorithm>
#include <cstddef>
#include <iterator>
#include <memory>
#include <string>
#include <utility>
#include "base/logging.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "components/autofill/core/browser/address_field.h"
#include "components/autofill/core/browser/autofill_field.h"
#include "components/autofill/core/browser/autofill_scanner.h"
#include "components/autofill/core/browser/credit_card_field.h"
#include "components/autofill/core/browser/email_field.h"
#include "components/autofill/core/browser/form_structure.h"
#include "components/autofill/core/browser/name_field.h"
#include "components/autofill/core/browser/phone_field.h"
#include "components/autofill/core/common/autofill_regexes.h"
#include "components/autofill/core/common/autofill_util.h"
namespace autofill {
// There's an implicit precedence determined by the values assigned here. Email
// is currently the most important followed by Phone, Address, Credit Card and
// finally Name.
const float FormField::kBaseEmailParserScore = 1.4f;
const float FormField::kBasePhoneParserScore = 1.3f;
const float FormField::kBaseAddressParserScore = 1.2f;
const float FormField::kBaseCreditCardParserScore = 1.1f;
const float FormField::kBaseNameParserScore = 1.0f;
// static
FieldCandidatesMap FormField::ParseFormFields(
const std::vector<std::unique_ptr<AutofillField>>& fields,
bool is_form_tag) {
// Set up a working copy of the fields to be processed.
std::vector<AutofillField*> processed_fields;
for (const auto& field : fields) {
// Ignore checkable fields as they interfere with parsers assuming context.
// Eg., while parsing address, "Is PO box" checkbox after ADDRESS_LINE1
// interferes with correctly understanding ADDRESS_LINE2.
// Ignore fields marked as presentational. See
// http://www.w3.org/TR/wai-aria/roles#presentation
if (IsCheckable(field->check_status) ||
field->role == FormFieldData::ROLE_ATTRIBUTE_PRESENTATION) {
continue;
}
processed_fields.push_back(field.get());
}
FieldCandidatesMap field_candidates;
// Email pass.
ParseFormFieldsPass(EmailField::Parse, processed_fields, &field_candidates);
const size_t email_count = field_candidates.size();
// Phone pass.
ParseFormFieldsPass(PhoneField::Parse, processed_fields, &field_candidates);
// Address pass.
ParseFormFieldsPass(AddressField::Parse, processed_fields, &field_candidates);
// Credit card pass.
ParseFormFieldsPass(CreditCardField::Parse, processed_fields,
&field_candidates);
// Name pass.
ParseFormFieldsPass(NameField::Parse, processed_fields, &field_candidates);
// Do not autofill a form if there are less than 3 recognized fields.
// Otherwise it is very easy to have false positives. http://crbug.com/447332
// For <form> tags, make an exception for email fields, which are commonly the
// only recognized field on account registration sites.
static const size_t kThreshold = 3;
const bool accept_parsing = (field_candidates.size() >= kThreshold ||
(is_form_tag && email_count > 0));
if (!accept_parsing)
field_candidates.clear();
return field_candidates;
}
// static
bool FormField::ParseField(AutofillScanner* scanner,
const base::string16& pattern,
AutofillField** match) {
return ParseFieldSpecifics(scanner, pattern, MATCH_DEFAULT, match);
}
// static
bool FormField::ParseFieldSpecifics(AutofillScanner* scanner,
const base::string16& pattern,
int match_type,
AutofillField** match) {
if (scanner->IsEnd())
return false;
const AutofillField* field = scanner->Cursor();
if (!MatchesFormControlType(field->form_control_type, match_type))
return false;
return MatchAndAdvance(scanner, pattern, match_type, match);
}
// static
bool FormField::ParseEmptyLabel(AutofillScanner* scanner,
AutofillField** match) {
return ParseFieldSpecifics(scanner,
base::ASCIIToUTF16("^$"),
MATCH_LABEL | MATCH_ALL_INPUTS,
match);
}
// static
void FormField::AddClassification(const AutofillField* field,
ServerFieldType type,
float score,
FieldCandidatesMap* field_candidates) {
// Several fields are optional.
if (field == nullptr)
return;
FieldCandidates& candidates = (*field_candidates)[field->unique_name()];
candidates.AddFieldCandidate(type, score);
}
// static.
bool FormField::MatchAndAdvance(AutofillScanner* scanner,
const base::string16& pattern,
int match_type,
AutofillField** match) {
AutofillField* field = scanner->Cursor();
if (FormField::Match(field, pattern, match_type)) {
if (match)
*match = field;
scanner->Advance();
return true;
}
return false;
}
// static
bool FormField::Match(const AutofillField* field,
const base::string16& pattern,
int match_type) {
if ((match_type & FormField::MATCH_LABEL) &&
MatchesPattern(field->label, pattern)) {
return true;
}
if ((match_type & FormField::MATCH_NAME) &&
MatchesPattern(field->parseable_name(), pattern)) {
return true;
}
return false;
}
// static
void FormField::ParseFormFieldsPass(ParseFunction parse,
const std::vector<AutofillField*>& fields,
FieldCandidatesMap* field_candidates) {
AutofillScanner scanner(fields);
while (!scanner.IsEnd()) {
std::unique_ptr<FormField> form_field = parse(&scanner);
if (form_field == nullptr) {
scanner.Advance();
} else {
// Add entries into |field_candidates| for each field type found in
// |fields|.
form_field->AddClassifications(field_candidates);
}
}
}
bool FormField::MatchesFormControlType(const std::string& type,
int match_type) {
if ((match_type & MATCH_TEXT) && type == "text")
return true;
if ((match_type & MATCH_EMAIL) && type == "email")
return true;
if ((match_type & MATCH_TELEPHONE) && type == "tel")
return true;
if ((match_type & MATCH_SELECT) && type == "select-one")
return true;
if ((match_type & MATCH_TEXT_AREA) && type == "textarea")
return true;
if ((match_type & MATCH_PASSWORD) && type == "password")
return true;
if ((match_type & MATCH_NUMBER) && type == "number")
return true;
return false;
}
} // namespace autofill
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