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// Copyright 2013 The Chromium Authors
// 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/form_cache.h"
#include <algorithm>
#include <functional>
#include <string>
#include <string_view>
#include <utility>
#include "base/check_deref.h"
#include "base/containers/contains.h"
#include "base/feature_list.h"
#include "components/autofill/content/renderer/autofill_agent.h"
#include "components/autofill/content/renderer/form_autofill_util.h"
#include "components/autofill/content/renderer/timing.h"
#include "components/autofill/core/common/autofill_constants.h"
#include "components/strings/grit/components_strings.h"
#include "third_party/blink/public/web/web_document.h"
#include "third_party/blink/public/web/web_form_control_element.h"
#include "third_party/blink/public/web/web_form_element.h"
namespace autofill {
using form_util::ExtractOption;
namespace {
// Determines whether the form is interesting enough to be sent to the browser
// for further operations. This is the case if any of the below holds:
// (1) At least one form field is not-checkable. (See crbug.com/1489075.)
// (2) At least one field has a non-empty autocomplete attribute.
// (3) There is at least one iframe.
// TODO(crbug.com/40283901): Should an element that IsCheckableElement() also be
// IsAutofillableInputElement()?
bool IsFormInteresting(const FormData& form) {
auto is_checkable = [](FormControlType type) {
return type == FormControlType::kInputCheckbox ||
type == FormControlType::kInputRadio;
};
return !form.child_frames().empty() ||
std::ranges::any_of(form.fields(), std::not_fn(is_checkable),
&FormFieldData::form_control_type) ||
std::ranges::any_of(form.fields(), std::not_fn(&std::string::empty),
&FormFieldData::autocomplete_attribute);
}
} // namespace
FormCache::UpdateFormCacheResult::UpdateFormCacheResult() = default;
FormCache::UpdateFormCacheResult::UpdateFormCacheResult(
UpdateFormCacheResult&&) = default;
FormCache::UpdateFormCacheResult& FormCache::UpdateFormCacheResult::operator=(
UpdateFormCacheResult&&) = default;
FormCache::UpdateFormCacheResult::~UpdateFormCacheResult() = default;
FormCache::FormCache(AutofillAgent* owner) : agent_(CHECK_DEREF(owner)) {}
FormCache::~FormCache() = default;
void FormCache::Reset() {
extracted_forms_.clear();
}
FormCache::UpdateFormCacheResult FormCache::UpdateFormCache(
const FieldDataManager& field_data_manager,
const CallTimerState& timer_state) {
constexpr auto kUpdateFormCache = CallTimerState::CallSite::kUpdateFormCache;
ScopedCallTimer timer("UpdateFormCache", timer_state);
// |extracted_forms_| is re-populated below in ProcessForm().
std::map<FormRendererId, std::unique_ptr<FormData>> old_extracted_forms =
std::move(extracted_forms_);
extracted_forms_.clear();
UpdateFormCacheResult r;
r.removed_forms = base::MakeFlatSet<FormRendererId>(
old_extracted_forms, {},
&std::pair<const FormRendererId, std::unique_ptr<FormData>>::first);
for (const auto& [id, form] : old_extracted_forms) {
if (!form) {
r.removed_forms.erase(id);
}
}
size_t num_fields_seen = 0;
size_t num_frames_seen = 0;
// Helper function that stores new autofillable forms in |forms|. Returns
// false iff the total number of fields exceeds |kMaxExtractableFields|.
// Clears |form|'s FormData::child_frames if the total number of frames
// exceeds |kMaxExtractableChildFrames|.
auto ProcessForm = [&](FormData form) {
num_fields_seen += form.fields().size();
num_frames_seen += form.child_frames().size();
// Enforce the kMaxExtractableFields limit: ignore all forms after this
// limit has been reached (i.e., abort parsing).
if (num_fields_seen > kMaxExtractableFields) {
return false;
}
// Enforce the kMaxExtractableChildFrames limit: ignore the iframes, but
// do not ignore the fields (i.e., continue parsing).
if (num_frames_seen > kMaxExtractableChildFrames) {
form.set_child_frames({});
}
// Store only forms that contain iframes or fields.
if (IsFormInteresting(form)) {
FormRendererId form_id = form.renderer_id();
auto it = old_extracted_forms.find(form_id);
if (it == old_extracted_forms.end() || !it->second ||
!FormData::DeepEqual(std::move(*it->second), form)) {
r.updated_forms.push_back(form);
}
r.removed_forms.erase(form_id);
extracted_forms_[form_id] = std::make_unique<FormData>(std::move(form));
}
return true;
};
blink::WebDocument document = agent_->GetDocument();
if (!document) {
return r;
}
std::vector<blink::WebFormElement> form_elements =
document.GetTopLevelForms();
// Add a null WebFormElement to account for the form of unowned elements.
form_elements.emplace_back();
bool stop_extracting_forms = false;
for (const blink::WebFormElement& form_element : form_elements) {
extracted_forms_[form_util::GetFormRendererId(form_element)] = nullptr;
if (stop_extracting_forms) {
continue;
}
if (std::optional<FormData> form = form_util::ExtractFormData(
document, form_element, field_data_manager,
agent_->GetCallTimerState(kUpdateFormCache),
agent_->button_titles_cache())) {
if (!ProcessForm(std::move(*form))) {
stop_extracting_forms = true;
}
}
}
return r;
}
} // namespace autofill
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