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// Copyright (c) 2010 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 "chrome/browser/autofill/form_structure.h"
#include "base/basictypes.h"
#include "base/logging.h"
#include "base/sha1.h"
#include "base/string_number_conversions.h"
#include "base/utf_string_conversions.h"
#include "chrome/browser/autofill/autofill_metrics.h"
#include "chrome/browser/autofill/autofill_xml_parser.h"
#include "chrome/browser/autofill/field_types.h"
#include "chrome/browser/autofill/form_field.h"
#include "third_party/libjingle/source/talk/xmllite/xmlelement.h"
#include "webkit/glue/form_field.h"
using webkit_glue::FormData;
namespace {
const char* kFormMethodPost = "post";
// XML attribute names.
const char* const kAttributeClientVersion = "clientversion";
const char* const kAttributeAutoFillUsed = "autofillused";
const char* const kAttributeSignature = "signature";
const char* const kAttributeFormSignature = "formsignature";
const char* const kAttributeDataPresent = "datapresent";
const char* const kXMLElementForm = "form";
const char* const kXMLElementField = "field";
const char* const kAttributeAutoFillType = "autofilltype";
// The list of form control types we handle.
const char* const kControlTypeSelect = "select-one";
const char* const kControlTypeText = "text";
// The number of fillable fields necessary for a form to be fillable.
const size_t kRequiredFillableFields = 3;
static std::string Hash64Bit(const std::string& str) {
std::string hash_bin = base::SHA1HashString(str);
DCHECK_EQ(20U, hash_bin.length());
uint64 hash64 = (((static_cast<uint64>(hash_bin[0])) & 0xFF) << 56) |
(((static_cast<uint64>(hash_bin[1])) & 0xFF) << 48) |
(((static_cast<uint64>(hash_bin[2])) & 0xFF) << 40) |
(((static_cast<uint64>(hash_bin[3])) & 0xFF) << 32) |
(((static_cast<uint64>(hash_bin[4])) & 0xFF) << 24) |
(((static_cast<uint64>(hash_bin[5])) & 0xFF) << 16) |
(((static_cast<uint64>(hash_bin[6])) & 0xFF) << 8) |
((static_cast<uint64>(hash_bin[7])) & 0xFF);
return base::Uint64ToString(hash64);
}
} // namespace
FormStructure::FormStructure(const FormData& form)
: form_name_(form.name),
source_url_(form.origin),
target_url_(form.action),
has_credit_card_field_(false),
has_autofillable_field_(false),
has_password_fields_(false),
autofill_count_(0) {
// Copy the form fields.
std::vector<webkit_glue::FormField>::const_iterator field;
for (field = form.fields.begin();
field != form.fields.end(); field++) {
// We currently only handle text and select fields; however, we need to
// store all fields in order to match the fields stored in the FormManager.
// We don't append other field types to the form signature though in order
// to match the form signature of the AutoFill servers.
if (LowerCaseEqualsASCII(field->form_control_type(), kControlTypeText) ||
LowerCaseEqualsASCII(field->form_control_type(), kControlTypeSelect)) {
// Add all supported form fields (including with empty names) to
// signature. This is a requirement for AutoFill servers.
form_signature_field_names_.append("&");
form_signature_field_names_.append(UTF16ToUTF8(field->name()));
}
// Generate a unique name for this field by appending a counter to the name.
string16 unique_name = field->name() +
base::IntToString16(fields_.size() + 1);
fields_.push_back(new AutoFillField(*field, unique_name));
}
// Terminate the vector with a NULL item.
fields_.push_back(NULL);
GetHeuristicAutoFillTypes();
std::string method = UTF16ToUTF8(form.method);
if (StringToLowerASCII(method) == kFormMethodPost) {
method_ = POST;
} else {
// Either the method is 'get', or we don't know. In this case we default
// to GET.
method_ = GET;
}
}
FormStructure::~FormStructure() {}
bool FormStructure::EncodeUploadRequest(bool auto_fill_used,
std::string* encoded_xml) const {
DCHECK(encoded_xml);
encoded_xml->clear();
bool auto_fillable = IsAutoFillable(false);
DCHECK(auto_fillable); // Caller should've checked for search pages.
if (!auto_fillable)
return false;
buzz::XmlElement autofil_request_xml(buzz::QName("autofillupload"));
// Attributes for the <autofillupload> element.
//
// TODO(jhawkins): Work with toolbar devs to make a spec for autofill clients.
// For now these values are hacked from the toolbar code.
autofil_request_xml.SetAttr(buzz::QName(kAttributeClientVersion),
"6.1.1715.1442/en (GGLL)");
autofil_request_xml.SetAttr(buzz::QName(kAttributeFormSignature),
FormSignature());
autofil_request_xml.SetAttr(buzz::QName(kAttributeAutoFillUsed),
auto_fill_used ? "true" : "false");
// TODO(jhawkins): Hook this up to the personal data manager.
// personaldata_manager_->GetDataPresent();
autofil_request_xml.SetAttr(buzz::QName(kAttributeDataPresent), "");
if (!EncodeFormRequest(FormStructure::UPLOAD, &autofil_request_xml))
return false; // Malformed form, skip it.
// Obtain the XML structure as a string.
*encoded_xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
*encoded_xml += autofil_request_xml.Str().c_str();
return true;
}
// static
bool FormStructure::EncodeQueryRequest(const ScopedVector<FormStructure>& forms,
std::vector<std::string>* encoded_signatures,
std::string* encoded_xml) {
DCHECK(encoded_signatures);
DCHECK(encoded_xml);
encoded_xml->clear();
encoded_signatures->clear();
encoded_signatures->reserve(forms.size());
buzz::XmlElement autofil_request_xml(buzz::QName("autofillquery"));
// Attributes for the <autofillquery> element.
//
// TODO(jhawkins): Work with toolbar devs to make a spec for autofill clients.
// For now these values are hacked from the toolbar code.
autofil_request_xml.SetAttr(buzz::QName(kAttributeClientVersion),
"6.1.1715.1442/en (GGLL)");
// Some badly formatted web sites repeat forms - detect that and encode only
// one form as returned data would be the same for all the repeated forms.
std::set<std::string> processed_forms;
for (ScopedVector<FormStructure>::const_iterator it = forms.begin();
it != forms.end();
++it) {
std::string signature((*it)->FormSignature());
if (processed_forms.find(signature) != processed_forms.end())
continue;
processed_forms.insert(signature);
scoped_ptr<buzz::XmlElement> encompassing_xml_element(
new buzz::XmlElement(buzz::QName("form")));
encompassing_xml_element->SetAttr(buzz::QName(kAttributeSignature),
signature);
if (!(*it)->EncodeFormRequest(FormStructure::QUERY,
encompassing_xml_element.get()))
continue; // Malformed form, skip it.
autofil_request_xml.AddElement(encompassing_xml_element.release());
encoded_signatures->push_back(signature);
}
if (!encoded_signatures->size())
return false;
// Obtain the XML structure as a string.
*encoded_xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
*encoded_xml += autofil_request_xml.Str().c_str();
return true;
}
// static
void FormStructure::ParseQueryResponse(const std::string& response_xml,
const std::vector<FormStructure*>& forms,
UploadRequired* upload_required,
const AutoFillMetrics& metric_logger) {
metric_logger.Log(AutoFillMetrics::QUERY_RESPONSE_RECEIVED);
// Parse the field types from the server response to the query.
std::vector<AutoFillFieldType> field_types;
AutoFillQueryXmlParser parse_handler(&field_types, upload_required);
buzz::XmlParser parser(&parse_handler);
parser.Parse(response_xml.c_str(), response_xml.length(), true);
if (!parse_handler.succeeded())
return;
metric_logger.Log(AutoFillMetrics::QUERY_RESPONSE_PARSED);
bool heuristics_detected_fillable_field = false;
bool query_response_overrode_heuristics = false;
// Copy the field types into the actual form.
std::vector<AutoFillFieldType>::iterator current_type = field_types.begin();
for (std::vector<FormStructure*>::const_iterator iter = forms.begin();
iter != forms.end(); ++iter) {
FormStructure* form = *iter;
if (form->has_autofillable_field_)
heuristics_detected_fillable_field = true;
form->has_credit_card_field_ = false;
form->has_autofillable_field_ = false;
for (std::vector<AutoFillField*>::iterator field = form->fields_.begin();
field != form->fields_.end(); ++field, ++current_type) {
// The field list is terminated by a NULL AutoFillField.
if (!*field)
break;
// In some cases *successful* response does not return all the fields.
// Quit the update of the types then.
if (current_type == field_types.end())
break;
// UNKNOWN_TYPE is reserved for use by the client.
DCHECK_NE(*current_type, UNKNOWN_TYPE);
AutoFillFieldType heuristic_type = (*field)->type();
(*field)->set_server_type(*current_type);
if (heuristic_type != (*field)->type())
query_response_overrode_heuristics = true;
AutoFillType autofill_type((*field)->type());
if (autofill_type.group() == AutoFillType::CREDIT_CARD)
form->has_credit_card_field_ = true;
if (autofill_type.field_type() != UNKNOWN_TYPE)
form->has_autofillable_field_ = true;
}
form->UpdateAutoFillCount();
}
AutoFillMetrics::ServerQueryMetric metric;
if (query_response_overrode_heuristics) {
if (heuristics_detected_fillable_field) {
metric = AutoFillMetrics::QUERY_RESPONSE_OVERRODE_LOCAL_HEURISTICS;
} else {
metric = AutoFillMetrics::QUERY_RESPONSE_WITH_NO_LOCAL_HEURISTICS;
}
} else {
metric = AutoFillMetrics::QUERY_RESPONSE_MATCHED_LOCAL_HEURISTICS;
}
metric_logger.Log(metric);
}
std::string FormStructure::FormSignature() const {
std::string form_string = target_url_.scheme() +
"://" +
target_url_.host() +
"&" +
UTF16ToUTF8(form_name_) +
form_signature_field_names_;
return Hash64Bit(form_string);
}
bool FormStructure::IsAutoFillable(bool require_method_post) const {
if (autofill_count() < kRequiredFillableFields)
return false;
return ShouldBeParsed(require_method_post);
}
bool FormStructure::HasAutoFillableValues() const {
if (autofill_count_ == 0)
return false;
for (std::vector<AutoFillField*>::const_iterator iter = begin();
iter != end(); ++iter) {
AutoFillField* field = *iter;
if (field && !field->IsEmpty() && field->IsFieldFillable())
return true;
}
return false;
}
void FormStructure::UpdateAutoFillCount() {
autofill_count_ = 0;
for (std::vector<AutoFillField*>::const_iterator iter = begin();
iter != end(); ++iter) {
AutoFillField* field = *iter;
if (field && field->IsFieldFillable())
++autofill_count_;
}
}
bool FormStructure::ShouldBeParsed(bool require_method_post) const {
if (field_count() < kRequiredFillableFields)
return false;
// Rule out http(s)://*/search?...
// e.g. http://www.google.com/search?q=...
// http://search.yahoo.com/search?p=...
if (target_url_.path() == "/search")
return false;
return !require_method_post || (method_ == POST);
}
void FormStructure::set_possible_types(int index, const FieldTypeSet& types) {
int num_fields = static_cast<int>(field_count());
DCHECK(index >= 0 && index < num_fields);
if (index >= 0 && index < num_fields)
fields_[index]->set_possible_types(types);
}
const AutoFillField* FormStructure::field(int index) const {
return fields_[index];
}
size_t FormStructure::field_count() const {
// Don't count the NULL terminator.
size_t field_size = fields_.size();
return (field_size == 0) ? 0 : field_size - 1;
}
bool FormStructure::operator==(const FormData& form) const {
// TODO(jhawkins): Is this enough to differentiate a form?
if (form_name_ == form.name &&
source_url_ == form.origin &&
target_url_ == form.action) {
return true;
}
// TODO(jhawkins): Compare field names, IDs and labels once we have labels
// set up.
return false;
}
bool FormStructure::operator!=(const FormData& form) const {
return !operator==(form);
}
void FormStructure::GetHeuristicAutoFillTypes() {
has_credit_card_field_ = false;
has_autofillable_field_ = false;
FieldTypeMap field_type_map;
GetHeuristicFieldInfo(&field_type_map);
for (size_t index = 0; index < field_count(); index++) {
AutoFillField* field = fields_[index];
DCHECK(field);
FieldTypeMap::iterator iter = field_type_map.find(field->unique_name());
AutoFillFieldType heuristic_auto_fill_type;
if (iter == field_type_map.end()) {
heuristic_auto_fill_type = UNKNOWN_TYPE;
} else {
heuristic_auto_fill_type = iter->second;
++autofill_count_;
}
field->set_heuristic_type(heuristic_auto_fill_type);
AutoFillType autofill_type(field->type());
if (autofill_type.group() == AutoFillType::CREDIT_CARD)
has_credit_card_field_ = true;
if (autofill_type.field_type() != UNKNOWN_TYPE)
has_autofillable_field_ = true;
}
}
void FormStructure::GetHeuristicFieldInfo(FieldTypeMap* field_type_map) {
FormFieldSet fields(this);
FormFieldSet::const_iterator field;
for (field = fields.begin(); field != fields.end(); field++) {
bool ok = (*field)->GetFieldInfo(field_type_map);
DCHECK(ok);
}
}
bool FormStructure::EncodeFormRequest(
FormStructure::EncodeRequestType request_type,
buzz::XmlElement* encompassing_xml_element) const {
if (!field_count()) // Nothing to add.
return false;
// Some badly formatted web sites repeat fields - limit number of fields to
// 48, which is far larger than any valid form and XML still fits into 2K.
const size_t kMaxFieldsOnTheForm = 48;
if (field_count() > kMaxFieldsOnTheForm) {
// This is not a valid form, most certainly. Do not send request for the
// wrongly formatted forms.
return false;
}
// Add the child nodes for the form fields.
for (size_t index = 0; index < field_count(); ++index) {
const AutoFillField* field = fields_[index];
if (request_type == FormStructure::UPLOAD) {
FieldTypeSet types = field->possible_types();
for (FieldTypeSet::const_iterator type = types.begin();
type != types.end(); type++) {
buzz::XmlElement *field_element = new buzz::XmlElement(
buzz::QName(kXMLElementField));
field_element->SetAttr(buzz::QName(kAttributeSignature),
field->FieldSignature());
field_element->SetAttr(buzz::QName(kAttributeAutoFillType),
base::IntToString(*type));
encompassing_xml_element->AddElement(field_element);
}
} else {
buzz::XmlElement *field_element = new buzz::XmlElement(
buzz::QName(kXMLElementField));
field_element->SetAttr(buzz::QName(kAttributeSignature),
field->FieldSignature());
encompassing_xml_element->AddElement(field_element);
}
}
return true;
}
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