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// Copyright 2018 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 <memory>
#include <utility>
#include <vector>
#include "base/macros.h"
#include "base/optional.h"
#include "components/password_manager/core/browser/form_parsing/password_field_prediction.h"
#include "components/password_manager/core/browser/password_form_forward.h"
#include "url/gurl.h"
namespace autofill {
struct FormData;
} // namespace autofill
namespace password_manager {
// The susbset of autocomplete flags related to passwords.
enum class AutocompleteFlag {
// Represents the whole family of cc-* flags + OTP flag.
// How likely is user interaction for a given field?
// Note: higher numeric values should match higher likeliness to allow using the
// standard operator< for comparison of likeliness.
enum class Interactability {
// When the field is invisible.
kUnlikely = 0,
// When the field is visible/focusable.
kPossible = 1,
// When the user actually typed into the field before.
kCertain = 2,
// A wrapper around FormFieldData, carrying some additional data used during
// parsing.
struct ProcessedField {
// This points to the wrapped FormFieldData.
const autofill::FormFieldData* field;
// The flag derived from field->autocomplete_attribute.
AutocompleteFlag autocomplete_flag = AutocompleteFlag::kNone;
// True if field->form_control_type == "password".
bool is_password = false;
// True if field is predicted to be a password.
bool is_predicted_as_password = false;
// True if the server predicts that this field is not a password field.
bool server_hints_not_password = false;
// True if the server predicts that this field is not a username field.
bool server_hints_not_username = false;
Interactability interactability = Interactability::kUnlikely;
// This class takes care of parsing FormData into PasswordForm and managing
// related metadata.
class FormDataParser {
// Denotes the intended use of the result (for filling forms vs. saving
// captured credentials). This influences whether empty fields are ignored.
enum class Mode { kFilling, kSaving };
// This needs to be in sync with the histogram enumeration
// UsernameDetectionMethod, because the values are reported in the
// "PasswordManager.UsernameDetectionMethod" histogram. Don't remove or shift
// existing values in the enum, only append and mark as obsolete as needed.
enum class UsernameDetectionMethod {
kNoUsernameDetected = 0,
kBaseHeuristic = 1,
kHtmlBasedClassifier = 2,
kAutocompleteAttribute = 3,
kServerSidePrediction = 4,
kMaxValue = kServerSidePrediction,
// Records whether password fields with a "readonly" attribute were ignored
// during form parsing.
enum class ReadonlyPasswordFields {
// Local heuristics, which only consider the readonly attribute, were not
// used for the parsing. This means that either the form was unsuitable for
// parsing (e.g., no fields at all), or some of the more trusted methods
// (server hints, autocomplete attributes) succeeded.
kNoHeuristics = 0,
// The rest of the values refer to the case when local heuristics were used.
// In that case there are always some password fields.
// No password fields with "readonly" ignored but some password fields
// present.
kNoneIgnored = 2,
// At least one password with "readonly" was ignored and at least one other
// password field was not ignored (whether readonly or not).
kSomeIgnored = 3,
// At least one password with "readonly" was ignored and every password
// field was ignored because of being readonly.
kAllIgnored = 4,
// The parser will give up on parsing any FormData with more than
// |kMaxParseableFields| fields.
static const size_t kMaxParseableFields = 10000;
void set_predictions(FormPredictions predictions) {
predictions_ = std::move(predictions);
const base::Optional<FormPredictions>& predictions() { return predictions_; }
ReadonlyPasswordFields readonly_status() { return readonly_status_; }
// Parse DOM information |form_data| into Password Manager's form
// representation PasswordForm. Return nullptr when parsing is unsuccessful.
std::unique_ptr<PasswordForm> Parse(const autofill::FormData& form_data,
Mode mode);
// Predictions are an optional source of server-side information about field
// types.
base::Optional<FormPredictions> predictions_;
// Records whether readonly password fields were seen during the last call to
// Parse().
ReadonlyPasswordFields readonly_status_ =
// Returns the value of PasswordForm::signon_realm for an HTML form with the
// origin |url|.
std::string GetSignonRealm(const GURL& url);
// Find the first element in |username_predictions| (i.e. the most reliable
// prediction) that occurs in |processed_fields| and has interactability level
// at least |username_max|.
const autofill::FormFieldData* FindUsernameInPredictions(
const std::vector<autofill::FieldRendererId>& username_predictions,
const std::vector<ProcessedField>& processed_fields,
Interactability username_max);
} // namespace password_manager