components/autofill/content/renderer/autofill_agent.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/content/renderer/autofill_agent.h"

#include "base/auto_reset.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/message_loop/message_loop.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/time/time.h"
#include "components/autofill/content/common/autofill_messages.h"
#include "components/autofill/content/renderer/form_autofill_util.h"
#include "components/autofill/content/renderer/page_click_tracker.h"
#include "components/autofill/content/renderer/password_autofill_agent.h"
#include "components/autofill/content/renderer/password_generation_agent.h"
#include "components/autofill/core/common/autofill_constants.h"
#include "components/autofill/core/common/autofill_data_validation.h"
#include "components/autofill/core/common/autofill_switches.h"
#include "components/autofill/core/common/form_data.h"
#include "components/autofill/core/common/form_data_predictions.h"
#include "components/autofill/core/common/form_field_data.h"
#include "components/autofill/core/common/password_form.h"
#include "components/autofill/core/common/web_element_descriptor.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/ssl_status.h"
#include "content/public/common/url_constants.h"
#include "content/public/renderer/render_frame.h"
#include "content/public/renderer/render_view.h"
#include "net/cert/cert_status_flags.h"
#include "third_party/WebKit/public/platform/WebRect.h"
#include "third_party/WebKit/public/platform/WebURLRequest.h"
#include "third_party/WebKit/public/web/WebConsoleMessage.h"
#include "third_party/WebKit/public/web/WebDataSource.h"
#include "third_party/WebKit/public/web/WebDocument.h"
#include "third_party/WebKit/public/web/WebElementCollection.h"
#include "third_party/WebKit/public/web/WebFormControlElement.h"
#include "third_party/WebKit/public/web/WebFormElement.h"
#include "third_party/WebKit/public/web/WebInputEvent.h"
#include "third_party/WebKit/public/web/WebLocalFrame.h"
#include "third_party/WebKit/public/web/WebNode.h"
#include "third_party/WebKit/public/web/WebOptionElement.h"
#include "third_party/WebKit/public/web/WebTextAreaElement.h"
#include "third_party/WebKit/public/web/WebUserGestureIndicator.h"
#include "third_party/WebKit/public/web/WebView.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/events/keycodes/keyboard_codes.h"

using blink::WebAutofillClient;
using blink::WebConsoleMessage;
using blink::WebDocument;
using blink::WebElement;
using blink::WebElementCollection;
using blink::WebFormControlElement;
using blink::WebFormElement;
using blink::WebFrame;
using blink::WebInputElement;
using blink::WebKeyboardEvent;
using blink::WebLocalFrame;
using blink::WebNode;
using blink::WebOptionElement;
using blink::WebString;
using blink::WebTextAreaElement;
using blink::WebUserGestureIndicator;
using blink::WebVector;

namespace autofill {

namespace {

// Gets all the data list values (with corresponding label) for the given
// element.
void GetDataListSuggestions(const WebInputElement& element,
                            bool ignore_current_value,
                            std::vector<base::string16>* values,
                            std::vector<base::string16>* labels) {
  WebElementCollection options = element.dataListOptions();
  if (options.isNull())
    return;

  base::string16 prefix;
  if (!ignore_current_value) {
    prefix = element.editingValue();
    if (element.isMultiple() && element.isEmailField()) {
      std::vector<base::string16> parts;
      base::SplitStringDontTrim(prefix, ',', &parts);
      if (parts.size() > 0) {
        base::TrimWhitespace(parts[parts.size() - 1], base::TRIM_LEADING,
                             &prefix);
      }
    }
  }
  for (WebOptionElement option = options.firstItem().to<WebOptionElement>();
       !option.isNull(); option = options.nextItem().to<WebOptionElement>()) {
    if (!StartsWith(option.value(), prefix, false) ||
        option.value() == prefix ||
        !element.isValidValue(option.value()))
      continue;

    values->push_back(option.value());
    if (option.value() != option.label())
      labels->push_back(option.label());
    else
      labels->push_back(base::string16());
  }
}

// Trim the vector before sending it to the browser process to ensure we
// don't send too much data through the IPC.
void TrimStringVectorForIPC(std::vector<base::string16>* strings) {
  // Limit the size of the vector.
  if (strings->size() > kMaxListSize)
    strings->resize(kMaxListSize);

  // Limit the size of the strings in the vector.
  for (size_t i = 0; i < strings->size(); ++i) {
    if ((*strings)[i].length() > kMaxDataLength)
      (*strings)[i].resize(kMaxDataLength);
  }
}

// Extract FormData from the form element and return whether the operation was
// successful.
bool ExtractFormDataOnSave(const WebFormElement& form_element, FormData* data) {
  return WebFormElementToFormData(
      form_element, WebFormControlElement(),
      static_cast<ExtractMask>(EXTRACT_VALUE | EXTRACT_OPTION_TEXT), data,
      NULL);
}

}  // namespace

AutofillAgent::ShowSuggestionsOptions::ShowSuggestionsOptions()
    : autofill_on_empty_values(false),
      requires_caret_at_end(false),
      datalist_only(false),
      show_full_suggestion_list(false),
      show_password_suggestions_only(false) {
}

AutofillAgent::AutofillAgent(content::RenderFrame* render_frame,
                             PasswordAutofillAgent* password_autofill_agent,
                             PasswordGenerationAgent* password_generation_agent)
    : content::RenderFrameObserver(render_frame),
      form_cache_(*render_frame->GetWebFrame()),
      password_autofill_agent_(password_autofill_agent),
      password_generation_agent_(password_generation_agent),
      legacy_(render_frame->GetRenderView(), this),
      autofill_query_id_(0),
      was_query_node_autofilled_(false),
      has_shown_autofill_popup_for_current_edit_(false),
      ignore_text_changes_(false),
      is_popup_possibly_visible_(false),
      weak_ptr_factory_(this) {
  render_frame->GetWebFrame()->setAutofillClient(this);

  // This owns itself, and will delete itself when |render_frame| is destructed
  // (same as AutofillAgent).
  new PageClickTracker(render_frame, this);
}

AutofillAgent::~AutofillAgent() {}

bool AutofillAgent::FormDataCompare::operator()(const FormData& lhs,
                                                const FormData& rhs) const {
  if (lhs.name != rhs.name)
    return lhs.name < rhs.name;
  if (lhs.origin != rhs.origin)
    return lhs.origin < rhs.origin;
  if (lhs.action != rhs.action)
    return lhs.action < rhs.action;
  if (lhs.is_form_tag != rhs.is_form_tag)
    return lhs.is_form_tag < rhs.is_form_tag;
  return lhs.fields < rhs.fields;
}

bool AutofillAgent::OnMessageReceived(const IPC::Message& message) {
  bool handled = true;
  IPC_BEGIN_MESSAGE_MAP(AutofillAgent, message)
  IPC_MESSAGE_HANDLER(AutofillMsg_FirstUserGestureObservedInTab,
                      OnFirstUserGestureObservedInTab)
    IPC_MESSAGE_HANDLER(AutofillMsg_Ping, OnPing)
    IPC_MESSAGE_HANDLER(AutofillMsg_FillForm, OnFillForm)
    IPC_MESSAGE_HANDLER(AutofillMsg_PreviewForm, OnPreviewForm)
    IPC_MESSAGE_HANDLER(AutofillMsg_FieldTypePredictionsAvailable,
                        OnFieldTypePredictionsAvailable)
    IPC_MESSAGE_HANDLER(AutofillMsg_ClearForm, OnClearForm)
    IPC_MESSAGE_HANDLER(AutofillMsg_ClearPreviewedForm, OnClearPreviewedForm)
    IPC_MESSAGE_HANDLER(AutofillMsg_FillFieldWithValue, OnFillFieldWithValue)
    IPC_MESSAGE_HANDLER(AutofillMsg_PreviewFieldWithValue,
                        OnPreviewFieldWithValue)
    IPC_MESSAGE_HANDLER(AutofillMsg_AcceptDataListSuggestion,
                        OnAcceptDataListSuggestion)
    IPC_MESSAGE_HANDLER(AutofillMsg_FillPasswordSuggestion,
                        OnFillPasswordSuggestion)
    IPC_MESSAGE_HANDLER(AutofillMsg_PreviewPasswordSuggestion,
                        OnPreviewPasswordSuggestion)
    IPC_MESSAGE_HANDLER(AutofillMsg_RequestAutocompleteResult,
                        OnRequestAutocompleteResult)
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP()
  return handled;
}

void AutofillAgent::DidCommitProvisionalLoad(bool is_new_navigation,
                                             bool is_same_page_navigation) {
  form_cache_.Reset();
  submitted_forms_.clear();
}

void AutofillAgent::DidFinishDocumentLoad() {
  ProcessForms();
}

void AutofillAgent::WillSendSubmitEvent(const WebFormElement& form) {
  FormData form_data;
  if (!ExtractFormDataOnSave(form, &form_data))
    return;

  // The WillSendSubmitEvent function is called when there is a submit handler
  // on the form, such as in the case of (but not restricted to)
  // JavaScript-submitted forms. Sends a WillSubmitForm message to the browser
  // and remembers for which form it did that in the current frame load, so that
  // no additional message is sent if AutofillAgent::WillSubmitForm() is called
  // (which is itself not guaranteed if the submit event is prevented by
  // JavaScript).
  Send(new AutofillHostMsg_WillSubmitForm(routing_id(), form_data,
                                          base::TimeTicks::Now()));
  submitted_forms_.insert(form_data);
}

void AutofillAgent::WillSubmitForm(const WebFormElement& form) {
  FormData form_data;
  if (!ExtractFormDataOnSave(form, &form_data))
    return;

  // If WillSubmitForm message had not been sent for this form, send it.
  if (!submitted_forms_.count(form_data)) {
    Send(new AutofillHostMsg_WillSubmitForm(routing_id(), form_data,
                                            base::TimeTicks::Now()));
  }

  Send(new AutofillHostMsg_FormSubmitted(routing_id(), form_data));
}

void AutofillAgent::DidChangeScrollOffset() {
  HidePopup();
}

void AutofillAgent::FocusedNodeChanged(const WebNode& node) {
  HidePopup();

  if (node.isNull() || !node.isElementNode())
    return;

  WebElement web_element = node.toConst<WebElement>();
  const WebInputElement* element = toWebInputElement(&web_element);

  if (!element || !element->isEnabled() || element->isReadOnly() ||
      !element->isTextField())
    return;

  element_ = *element;
}

void AutofillAgent::FocusChangeComplete() {
  WebDocument doc = render_frame()->GetWebFrame()->document();
  WebElement focused_element;
  if (!doc.isNull())
    focused_element = doc.focusedElement();

  if (!focused_element.isNull() && password_generation_agent_ &&
      password_generation_agent_->FocusedNodeHasChanged(focused_element)) {
    is_popup_possibly_visible_ = true;
  }
}

void AutofillAgent::didRequestAutocomplete(
    const WebFormElement& form) {
  DCHECK_EQ(form.document().frame(), render_frame()->GetWebFrame());

  // Disallow the dialog over non-https or broken https, except when the
  // ignore SSL flag is passed. See http://crbug.com/272512.
  // TODO(palmer): this should be moved to the browser process after frames
  // get their own processes.
  GURL url(form.document().url());
  content::SSLStatus ssl_status =
      render_frame()->GetRenderView()->GetSSLStatusOfFrame(
          form.document().frame());
  bool is_safe = url.SchemeIs(url::kHttpsScheme) &&
      !net::IsCertStatusError(ssl_status.cert_status);
  bool allow_unsafe = base::CommandLine::ForCurrentProcess()->HasSwitch(
      ::switches::kReduceSecurityForTesting);
  FormData form_data;
  std::string error_message;
  if (!in_flight_request_form_.isNull()) {
    error_message = "already active.";
  } else if (!is_safe && !allow_unsafe) {
    error_message =
        "must use a secure connection or --reduce-security-for-testing.";
  } else if (!WebFormElementToFormData(form,
                                       WebFormControlElement(),
                                       static_cast<ExtractMask>(
                                           EXTRACT_VALUE |
                                           EXTRACT_OPTION_TEXT |
                                           EXTRACT_OPTIONS),
                                       &form_data,
                                       NULL)) {
    error_message = "failed to parse form.";
  }

  if (!error_message.empty()) {
    WebConsoleMessage console_message = WebConsoleMessage(
        WebConsoleMessage::LevelLog,
        WebString(base::ASCIIToUTF16("requestAutocomplete: ") +
                      base::ASCIIToUTF16(error_message)));
    form.document().frame()->addMessageToConsole(console_message);
    WebFormElement(form).finishRequestAutocomplete(
        WebFormElement::AutocompleteResultErrorDisabled);
    return;
  }

  // Cancel any pending Autofill requests and hide any currently showing popups.
  ++autofill_query_id_;
  HidePopup();

  in_flight_request_form_ = form;
  Send(new AutofillHostMsg_RequestAutocomplete(routing_id(), form_data));
}

void AutofillAgent::setIgnoreTextChanges(bool ignore) {
  ignore_text_changes_ = ignore;
}

void AutofillAgent::FormControlElementClicked(
    const WebFormControlElement& element,
    bool was_focused) {
  // TODO(estade): Remove this check when PageClickTracker is per-frame.
  if (element.document().frame() != render_frame()->GetWebFrame())
    return;

  const WebInputElement* input_element = toWebInputElement(&element);
  if (!input_element && !IsTextAreaElement(element))
    return;

  ShowSuggestionsOptions options;
  options.autofill_on_empty_values = true;
  options.show_full_suggestion_list = element.isAutofilled();

  // On Android, default to showing the dropdown on field focus.
  // On desktop, require an extra click after field focus.
  // See http://crbug.com/427660
#if defined(OS_ANDROID)
  bool single_click_autofill =
      !base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kDisableSingleClickAutofill);
#else
  bool single_click_autofill =
      base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kEnableSingleClickAutofill);
#endif

  if (!single_click_autofill) {
    // Show full suggestions when clicking on an already-focused form field. On
    // the initial click (not focused yet), only show password suggestions.
    options.show_full_suggestion_list =
        options.show_full_suggestion_list || was_focused;
    options.show_password_suggestions_only = !was_focused;
  }
  ShowSuggestions(element, options);
}

void AutofillAgent::textFieldDidEndEditing(const WebInputElement& element) {
  password_autofill_agent_->TextFieldDidEndEditing(element);
  has_shown_autofill_popup_for_current_edit_ = false;
  Send(new AutofillHostMsg_DidEndTextFieldEditing(routing_id()));
}

void AutofillAgent::textFieldDidChange(const WebFormControlElement& element) {
  DCHECK(toWebInputElement(&element) || IsTextAreaElement(element));
  if (ignore_text_changes_)
    return;

  if (!WebUserGestureIndicator::isProcessingUserGesture())
    return;

  // We post a task for doing the Autofill as the caret position is not set
  // properly at this point (http://bugs.webkit.org/show_bug.cgi?id=16976) and
  // it is needed to trigger autofill.
  weak_ptr_factory_.InvalidateWeakPtrs();
  base::MessageLoop::current()->PostTask(
      FROM_HERE,
      base::Bind(&AutofillAgent::TextFieldDidChangeImpl,
                 weak_ptr_factory_.GetWeakPtr(),
                 element));
}

void AutofillAgent::TextFieldDidChangeImpl(
    const WebFormControlElement& element) {
  // If the element isn't focused then the changes don't matter. This check is
  // required to properly handle IME interactions.
  if (!element.focused())
    return;

  const WebInputElement* input_element = toWebInputElement(&element);
  if (input_element) {
    if (password_generation_agent_ &&
        password_generation_agent_->TextDidChangeInTextField(*input_element)) {
      is_popup_possibly_visible_ = true;
      return;
    }

    if (password_autofill_agent_->TextDidChangeInTextField(*input_element)) {
      is_popup_possibly_visible_ = true;
      element_ = element;
      return;
    }
  }

  ShowSuggestionsOptions options;
  options.requires_caret_at_end = true;
  ShowSuggestions(element, options);

  FormData form;
  FormFieldData field;
  if (FindFormAndFieldForFormControlElement(element, &form, &field)) {
    Send(new AutofillHostMsg_TextFieldDidChange(routing_id(), form, field,
                                                base::TimeTicks::Now()));
  }
}

void AutofillAgent::textFieldDidReceiveKeyDown(const WebInputElement& element,
                                               const WebKeyboardEvent& event) {
  if (password_autofill_agent_->TextFieldHandlingKeyDown(element, event)) {
    element_ = element;
    return;
  }

  if (event.windowsKeyCode == ui::VKEY_DOWN ||
      event.windowsKeyCode == ui::VKEY_UP) {
    ShowSuggestionsOptions options;
    options.autofill_on_empty_values = true;
    options.requires_caret_at_end = true;
    ShowSuggestions(element, options);
  }
}

void AutofillAgent::openTextDataListChooser(const WebInputElement& element) {
  ShowSuggestionsOptions options;
  options.autofill_on_empty_values = true;
  options.datalist_only = true;
  ShowSuggestions(element, options);
}

void AutofillAgent::dataListOptionsChanged(const WebInputElement& element) {
  if (!is_popup_possibly_visible_ || !element.focused())
    return;

  TextFieldDidChangeImpl(element);
}

void AutofillAgent::firstUserGestureObserved() {
  password_autofill_agent_->FirstUserGestureObserved();
  Send(new AutofillHostMsg_FirstUserGestureObserved(routing_id()));
}

void AutofillAgent::AcceptDataListSuggestion(
    const base::string16& suggested_value) {
  WebInputElement* input_element = toWebInputElement(&element_);
  DCHECK(input_element);
  base::string16 new_value = suggested_value;
  // If this element takes multiple values then replace the last part with
  // the suggestion.
  if (input_element->isMultiple() && input_element->isEmailField()) {
    std::vector<base::string16> parts;

    base::SplitStringDontTrim(input_element->editingValue(), ',', &parts);
    if (parts.size() == 0)
      parts.push_back(base::string16());

    base::string16 last_part = parts.back();
    // We want to keep just the leading whitespace.
    for (size_t i = 0; i < last_part.size(); ++i) {
      if (!IsWhitespace(last_part[i])) {
        last_part = last_part.substr(0, i);
        break;
      }
    }
    last_part.append(suggested_value);
    parts[parts.size() - 1] = last_part;

    new_value = JoinString(parts, ',');
  }
  FillFieldWithValue(new_value, input_element);
}

void AutofillAgent::OnFieldTypePredictionsAvailable(
    const std::vector<FormDataPredictions>& forms) {
  for (size_t i = 0; i < forms.size(); ++i) {
    form_cache_.ShowPredictions(forms[i]);
  }
}

void AutofillAgent::OnFillForm(int query_id, const FormData& form) {
  if (query_id != autofill_query_id_)
    return;

  was_query_node_autofilled_ = element_.isAutofilled();
  FillForm(form, element_);
  Send(new AutofillHostMsg_DidFillAutofillFormData(routing_id(),
                                                   base::TimeTicks::Now()));
}

void AutofillAgent::OnFirstUserGestureObservedInTab() {
  password_autofill_agent_->FirstUserGestureObserved();
}

void AutofillAgent::OnPing() {
  Send(new AutofillHostMsg_PingAck(routing_id()));
}

void AutofillAgent::OnPreviewForm(int query_id, const FormData& form) {
  if (query_id != autofill_query_id_)
    return;

  was_query_node_autofilled_ = element_.isAutofilled();
  PreviewForm(form, element_);
  Send(new AutofillHostMsg_DidPreviewAutofillFormData(routing_id()));
}

void AutofillAgent::OnClearForm() {
  form_cache_.ClearFormWithElement(element_);
}

void AutofillAgent::OnClearPreviewedForm() {
  if (!element_.isNull()) {
    if (password_autofill_agent_->DidClearAutofillSelection(element_))
      return;

    ClearPreviewedFormWithElement(element_, was_query_node_autofilled_);
  } else {
    // TODO(isherman): There seem to be rare cases where this code *is*
    // reachable: see [ http://crbug.com/96321#c6 ].  Ideally we would
    // understand those cases and fix the code to avoid them.  However, so far I
    // have been unable to reproduce such a case locally.  If you hit this
    // NOTREACHED(), please file a bug against me.
    NOTREACHED();
  }
}

void AutofillAgent::OnFillFieldWithValue(const base::string16& value) {
  WebInputElement* input_element = toWebInputElement(&element_);
  if (input_element) {
    FillFieldWithValue(value, input_element);
    input_element->setAutofilled(true);
  }
}

void AutofillAgent::OnPreviewFieldWithValue(const base::string16& value) {
  WebInputElement* input_element = toWebInputElement(&element_);
  if (input_element)
    PreviewFieldWithValue(value, input_element);
}

void AutofillAgent::OnAcceptDataListSuggestion(const base::string16& value) {
  AcceptDataListSuggestion(value);
}

void AutofillAgent::OnFillPasswordSuggestion(const base::string16& username,
                                             const base::string16& password) {
  bool handled = password_autofill_agent_->FillSuggestion(
      element_,
      username,
      password);
  DCHECK(handled);
}

void AutofillAgent::OnPreviewPasswordSuggestion(
    const base::string16& username,
    const base::string16& password) {
  bool handled = password_autofill_agent_->PreviewSuggestion(
      element_,
      username,
      password);
  DCHECK(handled);
}

void AutofillAgent::OnRequestAutocompleteResult(
    WebFormElement::AutocompleteResult result,
    const base::string16& message,
    const FormData& form_data) {
  if (in_flight_request_form_.isNull())
    return;

  if (result == WebFormElement::AutocompleteResultSuccess) {
    FillFormIncludingNonFocusableElements(form_data, in_flight_request_form_);
    if (!in_flight_request_form_.checkValidity())
      result = WebFormElement::AutocompleteResultErrorInvalid;
  }

  in_flight_request_form_.finishRequestAutocomplete(result);

  if (!message.empty()) {
    const base::string16 prefix(base::ASCIIToUTF16("requestAutocomplete: "));
    WebConsoleMessage console_message = WebConsoleMessage(
        WebConsoleMessage::LevelLog, WebString(prefix + message));
    in_flight_request_form_.document().frame()->addMessageToConsole(
        console_message);
  }

  in_flight_request_form_.reset();
}

void AutofillAgent::ShowSuggestions(const WebFormControlElement& element,
                                    const ShowSuggestionsOptions& options) {
  if (!element.isEnabled() || element.isReadOnly())
    return;
  if (!options.datalist_only && !element.suggestedValue().isEmpty())
    return;

  const WebInputElement* input_element = toWebInputElement(&element);
  if (input_element) {
    if (!input_element->isTextField())
      return;
    if (!options.datalist_only && !input_element->suggestedValue().isEmpty())
      return;
  } else {
    DCHECK(IsTextAreaElement(element));
    if (!element.toConst<WebTextAreaElement>().suggestedValue().isEmpty())
      return;
  }

  // Don't attempt to autofill with values that are too large or if filling
  // criteria are not met.
  WebString value = element.editingValue();
  if (!options.datalist_only &&
      (value.length() > kMaxDataLength ||
       (!options.autofill_on_empty_values && value.isEmpty()) ||
       (options.requires_caret_at_end &&
        (element.selectionStart() != element.selectionEnd() ||
         element.selectionEnd() != static_cast<int>(value.length()))))) {
    // Any popup currently showing is obsolete.
    HidePopup();
    return;
  }

  element_ = element;
  if (IsAutofillableInputElement(input_element) &&
      (password_autofill_agent_->ShowSuggestions(
           *input_element, options.show_full_suggestion_list) ||
       options.show_password_suggestions_only)) {
    is_popup_possibly_visible_ = true;
    return;
  }

  // Password field elements should only have suggestions shown by the password
  // autofill agent.
  if (input_element && input_element->isPasswordField())
    return;

  QueryAutofillSuggestions(element, options.datalist_only);
}

void AutofillAgent::QueryAutofillSuggestions(
    const WebFormControlElement& element,
    bool datalist_only) {
  if (!element.document().frame())
    return;

  DCHECK(toWebInputElement(&element) || IsTextAreaElement(element));

  static int query_counter = 0;
  autofill_query_id_ = query_counter++;

  FormData form;
  FormFieldData field;
  if (!FindFormAndFieldForFormControlElement(element, &form, &field)) {
    // If we didn't find the cached form, at least let autocomplete have a shot
    // at providing suggestions.
    WebFormControlElementToFormField(element, EXTRACT_VALUE, &field);
  }
  if (datalist_only)
    field.should_autocomplete = false;

  gfx::RectF bounding_box_scaled = GetScaledBoundingBox(
      render_frame()->GetRenderView()->GetWebView()->pageScaleFactor(),
      &element_);

  std::vector<base::string16> data_list_values;
  std::vector<base::string16> data_list_labels;
  const WebInputElement* input_element = toWebInputElement(&element);
  if (input_element) {
    // Find the datalist values and send them to the browser process.
    GetDataListSuggestions(*input_element,
                           datalist_only,
                           &data_list_values,
                           &data_list_labels);
    TrimStringVectorForIPC(&data_list_values);
    TrimStringVectorForIPC(&data_list_labels);
  }

  is_popup_possibly_visible_ = true;
  Send(new AutofillHostMsg_SetDataList(routing_id(),
                                       data_list_values,
                                       data_list_labels));

  Send(new AutofillHostMsg_QueryFormFieldAutofill(
      routing_id(), autofill_query_id_, form, field, bounding_box_scaled));
}

void AutofillAgent::FillFieldWithValue(const base::string16& value,
                                       WebInputElement* node) {
  base::AutoReset<bool> auto_reset(&ignore_text_changes_, true);
  node->setEditingValue(value.substr(0, node->maxLength()));
}

void AutofillAgent::PreviewFieldWithValue(const base::string16& value,
                                          WebInputElement* node) {
  was_query_node_autofilled_ = element_.isAutofilled();
  node->setSuggestedValue(value.substr(0, node->maxLength()));
  node->setAutofilled(true);
  node->setSelectionRange(node->value().length(),
                          node->suggestedValue().length());
}

void AutofillAgent::ProcessForms() {
  // Record timestamp of when the forms are first seen. This is used to
  // measure the overhead of the Autofill feature.
  base::TimeTicks forms_seen_timestamp = base::TimeTicks::Now();

  WebLocalFrame* frame = render_frame()->GetWebFrame();
  std::vector<FormData> forms = form_cache_.ExtractNewForms();

  // Always communicate to browser process for topmost frame.
  if (!forms.empty() || !frame->parent()) {
    Send(new AutofillHostMsg_FormsSeen(routing_id(), forms,
                                       forms_seen_timestamp));
  }
}

void AutofillAgent::HidePopup() {
  if (!is_popup_possibly_visible_)
    return;
  is_popup_possibly_visible_ = false;
  Send(new AutofillHostMsg_HidePopup(routing_id()));
}

void AutofillAgent::didAssociateFormControls(const WebVector<WebNode>& nodes) {
  for (size_t i = 0; i < nodes.size(); ++i) {
    WebLocalFrame* frame = nodes[i].document().frame();
    // Only monitors dynamic forms created in the top frame. Dynamic forms
    // inserted in iframes are not captured yet. Frame is only processed
    // if it has finished loading, otherwise you can end up with a partially
    // parsed form.
    if (frame && !frame->isLoading()) {
      ProcessForms();
      password_autofill_agent_->OnDynamicFormsSeen();
      if (password_generation_agent_)
        password_generation_agent_->OnDynamicFormsSeen();
      return;
    }
  }
}

void AutofillAgent::xhrSucceeded() {
  password_autofill_agent_->XHRSucceeded();
}

// LegacyAutofillAgent ---------------------------------------------------------

AutofillAgent::LegacyAutofillAgent::LegacyAutofillAgent(
    content::RenderView* render_view,
    AutofillAgent* agent)
    : content::RenderViewObserver(render_view), agent_(agent) {
}

AutofillAgent::LegacyAutofillAgent::~LegacyAutofillAgent() {
}

void AutofillAgent::LegacyAutofillAgent::OnDestruct() {
  // No-op. Don't delete |this|.
}

void AutofillAgent::LegacyAutofillAgent::FocusChangeComplete() {
  agent_->FocusChangeComplete();
}

}  // namespace autofill