form_structure.cc revision bb1529ce867d8845a77ec7cdf3e3003ef1771a40 
1// Copyright 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "components/autofill/core/browser/form_structure.h"
6
7#include <utility>
8
9#include "base/basictypes.h"
10#include "base/command_line.h"
11#include "base/logging.h"
12#include "base/memory/scoped_ptr.h"
13#include "base/sha1.h"
14#include "base/strings/string_number_conversions.h"
15#include "base/strings/string_util.h"
16#include "base/strings/stringprintf.h"
17#include "base/strings/utf_string_conversions.h"
18#include "base/time/time.h"
19#include "components/autofill/content/browser/autocheckout_page_meta_data.h"
20#include "components/autofill/core/browser/autofill_metrics.h"
21#include "components/autofill/core/browser/autofill_type.h"
22#include "components/autofill/core/browser/autofill_xml_parser.h"
23#include "components/autofill/core/browser/field_types.h"
24#include "components/autofill/core/browser/form_field.h"
25#include "components/autofill/core/common/autofill_constants.h"
26#include "components/autofill/core/common/form_data.h"
27#include "components/autofill/core/common/form_data_predictions.h"
28#include "components/autofill/core/common/form_field_data.h"
29#include "components/autofill/core/common/form_field_data_predictions.h"
30#include "third_party/icu/source/i18n/unicode/regex.h"
31#include "third_party/libjingle/source/talk/xmllite/xmlelement.h"
32
33namespace autofill {
34namespace {
35
36const char kFormMethodPost[] = "post";
37
38// XML elements and attributes.
39const char kAttributeAcceptedFeatures[] = "accepts";
40const char kAttributeAutofillUsed[] = "autofillused";
41const char kAttributeAutofillType[] = "autofilltype";
42const char kAttributeClientVersion[] = "clientversion";
43const char kAttributeDataPresent[] = "datapresent";
44const char kAttributeFieldID[] = "fieldid";
45const char kAttributeFieldType[] = "fieldtype";
46const char kAttributeFormSignature[] = "formsignature";
47const char kAttributeName[] = "name";
48const char kAttributeSignature[] = "signature";
49const char kAttributeUrlprefixSignature[] = "urlprefixsignature";
50const char kAcceptedFeaturesExperiment[] = "e"; // e=experiments
51const char kAcceptedFeaturesAutocheckoutExperiment[] = "a,e"; // a=autocheckout
52const char kClientVersion[] = "6.1.1715.1442/en (GGLL)";
53const char kXMLDeclaration[] = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
54const char kXMLElementAutofillQuery[] = "autofillquery";
55const char kXMLElementAutofillUpload[] = "autofillupload";
56const char kXMLElementFieldAssignments[] = "fieldassignments";
57const char kXMLElementField[] = "field";
58const char kXMLElementFields[] = "fields";
59const char kXMLElementForm[] = "form";
60const char kBillingMode[] = "billing";
61const char kShippingMode[] = "shipping";
62
63// Stip away >= 5 consecutive digits.
64const char kIgnorePatternInFieldName[] = "\\d{5,}+";
65
66// Helper for |EncodeUploadRequest()| that creates a bit field corresponding to
67// |available_field_types| and returns the hex representation as a string.
68std::string EncodeFieldTypes(const ServerFieldTypeSet& available_field_types) {
69  // There are |MAX_VALID_FIELD_TYPE| different field types and 8 bits per byte,
70  // so we need ceil(MAX_VALID_FIELD_TYPE / 8) bytes to encode the bit field.
71  const size_t kNumBytes = (MAX_VALID_FIELD_TYPE + 0x7) / 8;
72
73  // Pack the types in |available_field_types| into |bit_field|.
74  std::vector<uint8> bit_field(kNumBytes, 0);
75  for (ServerFieldTypeSet::const_iterator field_type =
76           available_field_types.begin();
77       field_type != available_field_types.end();
78       ++field_type) {
79    // Set the appropriate bit in the field.  The bit we set is the one
80    // |field_type| % 8 from the left of the byte.
81    const size_t byte = *field_type / 8;
82    const size_t bit = 0x80 >> (*field_type % 8);
83    DCHECK(byte < bit_field.size());
84    bit_field[byte] |= bit;
85  }
86
87  // Discard any trailing zeroes.
88  // If there are no available types, we return the empty string.
89  size_t data_end = bit_field.size();
90  for (; data_end > 0 && !bit_field[data_end - 1]; --data_end) {
91  }
92
93  // Print all meaningfull bytes into a string.
94  std::string data_presence;
95  data_presence.reserve(data_end * 2 + 1);
96  for (size_t i = 0; i < data_end; ++i) {
97    base::StringAppendF(&data_presence, "%02x", bit_field[i]);
98  }
99
100  return data_presence;
101}
102
103// Helper for |EncodeFormRequest()| that creates XmlElements for the given field
104// in upload xml, and also add them to the parent XmlElement.
105void EncodeFieldForUpload(const AutofillField& field,
106                          buzz::XmlElement* parent) {
107  // Don't upload checkable fields.
108  if (field.is_checkable)
109    return;
110
111  ServerFieldTypeSet types = field.possible_types();
112  // |types| could be empty in unit-tests only.
113  for (ServerFieldTypeSet::iterator field_type = types.begin();
114       field_type != types.end(); ++field_type) {
115    buzz::XmlElement *field_element = new buzz::XmlElement(
116        buzz::QName(kXMLElementField));
117
118    field_element->SetAttr(buzz::QName(kAttributeSignature),
119                           field.FieldSignature());
120    field_element->SetAttr(buzz::QName(kAttributeAutofillType),
121                           base::IntToString(*field_type));
122    parent->AddElement(field_element);
123  }
124}
125
126// Helper for |EncodeFormRequest()| that creates XmlElement for the given field
127// in query xml, and also add it to the parent XmlElement.
128void EncodeFieldForQuery(const AutofillField& field,
129                         buzz::XmlElement* parent) {
130  buzz::XmlElement *field_element = new buzz::XmlElement(
131      buzz::QName(kXMLElementField));
132  field_element->SetAttr(buzz::QName(kAttributeSignature),
133                         field.FieldSignature());
134  parent->AddElement(field_element);
135}
136
137// Helper for |EncodeFormRequest()| that creates XmlElements for the given field
138// in field assignments xml, and also add them to the parent XmlElement.
139void EncodeFieldForFieldAssignments(const AutofillField& field,
140                                    buzz::XmlElement* parent) {
141  ServerFieldTypeSet types = field.possible_types();
142  for (ServerFieldTypeSet::iterator field_type = types.begin();
143       field_type != types.end(); ++field_type) {
144    buzz::XmlElement *field_element = new buzz::XmlElement(
145        buzz::QName(kXMLElementFields));
146
147    field_element->SetAttr(buzz::QName(kAttributeFieldID),
148                           field.FieldSignature());
149    field_element->SetAttr(buzz::QName(kAttributeFieldType),
150                           base::IntToString(*field_type));
151    field_element->SetAttr(buzz::QName(kAttributeName),
152                           UTF16ToUTF8(field.name));
153    parent->AddElement(field_element);
154  }
155}
156
157// Returns |true| iff the |token| is a type hint for a contact field, as
158// specified in the implementation section of http://is.gd/whatwg_autocomplete
159// Note that "fax" and "pager" are intentionally ignored, as Chrome does not
160// support filling either type of information.
161bool IsContactTypeHint(const std::string& token) {
162  return token == "home" || token == "work" || token == "mobile";
163}
164
165// Returns |true| iff the |token| is a type hint appropriate for a field of the
166// given |field_type|, as specified in the implementation section of
167// http://is.gd/whatwg_autocomplete
168bool ContactTypeHintMatchesFieldType(const std::string& token,
169                                     HtmlFieldType field_type) {
170  // The "home" and "work" type hints are only appropriate for email and phone
171  // number field types.
172  if (token == "home" || token == "work") {
173    return field_type == HTML_TYPE_EMAIL ||
174        (field_type >= HTML_TYPE_TEL &&
175         field_type <= HTML_TYPE_TEL_LOCAL_SUFFIX);
176  }
177
178  // The "mobile" type hint is only appropriate for phone number field types.
179  // Note that "fax" and "pager" are intentionally ignored, as Chrome does not
180  // support filling either type of information.
181  if (token == "mobile") {
182    return field_type >= HTML_TYPE_TEL &&
183        field_type <= HTML_TYPE_TEL_LOCAL_SUFFIX;
184  }
185
186  return false;
187}
188
189// Returns the Chrome Autofill-supported field type corresponding to the given
190// |autocomplete_attribute_value|, if there is one, in the context of the given
191// |field|.  Chrome Autofill supports a subset of the field types listed at
192// http://is.gd/whatwg_autocomplete
193HtmlFieldType FieldTypeFromAutocompleteAttributeValue(
194    const std::string& autocomplete_attribute_value,
195    const AutofillField& field) {
196  if (autocomplete_attribute_value == "name")
197    return HTML_TYPE_NAME;
198
199  if (autocomplete_attribute_value == "given-name")
200    return HTML_TYPE_GIVEN_NAME;
201
202  if (autocomplete_attribute_value == "additional-name") {
203    if (field.max_length == 1)
204      return HTML_TYPE_ADDITIONAL_NAME_INITIAL;
205    else
206      return HTML_TYPE_ADDITIONAL_NAME;
207  }
208
209  if (autocomplete_attribute_value == "family-name")
210    return HTML_TYPE_FAMILY_NAME;
211
212  if (autocomplete_attribute_value == "organization")
213    return HTML_TYPE_ORGANIZATION;
214
215  if (autocomplete_attribute_value == "address-line1")
216    return HTML_TYPE_ADDRESS_LINE1;
217
218  if (autocomplete_attribute_value == "address-line2")
219    return HTML_TYPE_ADDRESS_LINE2;
220
221  if (autocomplete_attribute_value == "locality")
222    return HTML_TYPE_LOCALITY;
223
224  if (autocomplete_attribute_value == "region")
225    return HTML_TYPE_REGION;
226
227  if (autocomplete_attribute_value == "country")
228    return HTML_TYPE_COUNTRY_CODE;
229
230  if (autocomplete_attribute_value == "country-name")
231    return HTML_TYPE_COUNTRY_NAME;
232
233  if (autocomplete_attribute_value == "postal-code")
234    return HTML_TYPE_POSTAL_CODE;
235
236  if (autocomplete_attribute_value == "cc-name")
237    return HTML_TYPE_CREDIT_CARD_NAME;
238
239  if (autocomplete_attribute_value == "cc-number")
240    return HTML_TYPE_CREDIT_CARD_NUMBER;
241
242  if (autocomplete_attribute_value == "cc-exp") {
243    if (field.max_length == 5)
244      return HTML_TYPE_CREDIT_CARD_EXP_DATE_2_DIGIT_YEAR;
245    else if (field.max_length == 7)
246      return HTML_TYPE_CREDIT_CARD_EXP_DATE_4_DIGIT_YEAR;
247    else
248      return HTML_TYPE_CREDIT_CARD_EXP;
249  }
250
251  if (autocomplete_attribute_value == "cc-exp-month")
252    return HTML_TYPE_CREDIT_CARD_EXP_MONTH;
253
254  if (autocomplete_attribute_value == "cc-exp-year") {
255    if (field.max_length == 2)
256      return HTML_TYPE_CREDIT_CARD_EXP_2_DIGIT_YEAR;
257    else if (field.max_length == 4)
258      return HTML_TYPE_CREDIT_CARD_EXP_4_DIGIT_YEAR;
259    else
260      return HTML_TYPE_CREDIT_CARD_EXP_YEAR;
261  }
262
263  if (autocomplete_attribute_value == "cc-csc")
264    return HTML_TYPE_CREDIT_CARD_VERIFICATION_CODE;
265
266  if (autocomplete_attribute_value == "cc-type")
267    return HTML_TYPE_CREDIT_CARD_TYPE;
268
269  if (autocomplete_attribute_value == "tel")
270    return HTML_TYPE_TEL;
271
272  if (autocomplete_attribute_value == "tel-country-code")
273    return HTML_TYPE_TEL_COUNTRY_CODE;
274
275  if (autocomplete_attribute_value == "tel-national")
276    return HTML_TYPE_TEL_NATIONAL;
277
278  if (autocomplete_attribute_value == "tel-area-code")
279    return HTML_TYPE_TEL_AREA_CODE;
280
281  if (autocomplete_attribute_value == "tel-local")
282    return HTML_TYPE_TEL_LOCAL;
283
284  if (autocomplete_attribute_value == "tel-local-prefix")
285    return HTML_TYPE_TEL_LOCAL_PREFIX;
286
287  if (autocomplete_attribute_value == "tel-local-suffix")
288    return HTML_TYPE_TEL_LOCAL_SUFFIX;
289
290  if (autocomplete_attribute_value == "email")
291    return HTML_TYPE_EMAIL;
292
293  return HTML_TYPE_UNKNOWN;
294}
295
296std::string StripDigitsIfRequired(const base::string16& input) {
297  UErrorCode status = U_ZERO_ERROR;
298  CR_DEFINE_STATIC_LOCAL(icu::UnicodeString, icu_pattern,
299                         (kIgnorePatternInFieldName));
300  CR_DEFINE_STATIC_LOCAL(icu::RegexMatcher, matcher,
301                         (icu_pattern, UREGEX_CASE_INSENSITIVE, status));
302  DCHECK_EQ(status, U_ZERO_ERROR);
303
304  icu::UnicodeString icu_input(input.data(), input.length());
305  matcher.reset(icu_input);
306
307  icu::UnicodeString replaced_string = matcher.replaceAll("", status);
308
309  std::string return_string;
310  status = U_ZERO_ERROR;
311  UTF16ToUTF8(replaced_string.getBuffer(),
312              static_cast<size_t>(replaced_string.length()),
313              &return_string);
314  if (status != U_ZERO_ERROR) {
315    DVLOG(1) << "Couldn't strip digits in " << UTF16ToUTF8(input);
316    return UTF16ToUTF8(input);
317  }
318
319  return return_string;
320}
321
322}  // namespace
323
324FormStructure::FormStructure(const FormData& form,
325                             const std::string& autocheckout_url_prefix)
326    : form_name_(form.name),
327      source_url_(form.origin),
328      target_url_(form.action),
329      autofill_count_(0),
330      active_field_count_(0),
331      upload_required_(USE_UPLOAD_RATES),
332      server_experiment_id_("no server response"),
333      has_author_specified_types_(false),
334      autocheckout_url_prefix_(autocheckout_url_prefix),
335      filled_by_autocheckout_(false) {
336  // Copy the form fields.
337  std::map<base::string16, size_t> unique_names;
338  for (std::vector<FormFieldData>::const_iterator field =
339           form.fields.begin();
340       field != form.fields.end(); field++) {
341
342    if (!ShouldSkipField(*field)) {
343      // Add all supported form fields (including with empty names) to the
344      // signature.  This is a requirement for Autofill servers.
345      form_signature_field_names_.append("&");
346      form_signature_field_names_.append(StripDigitsIfRequired(field->name));
347
348      ++active_field_count_;
349    }
350
351    // Generate a unique name for this field by appending a counter to the name.
352    // Make sure to prepend the counter with a non-numeric digit so that we are
353    // guaranteed to avoid collisions.
354    if (!unique_names.count(field->name))
355      unique_names[field->name] = 1;
356    else
357      ++unique_names[field->name];
358    base::string16 unique_name = field->name + ASCIIToUTF16("_") +
359        base::IntToString16(unique_names[field->name]);
360    fields_.push_back(new AutofillField(*field, unique_name));
361  }
362
363  std::string method = UTF16ToUTF8(form.method);
364  if (StringToLowerASCII(method) == kFormMethodPost) {
365    method_ = POST;
366  } else {
367    // Either the method is 'get', or we don't know.  In this case we default
368    // to GET.
369    method_ = GET;
370  }
371}
372
373FormStructure::~FormStructure() {}
374
375void FormStructure::DetermineHeuristicTypes(
376    const AutofillMetrics& metric_logger) {
377  // First, try to detect field types based on each field's |autocomplete|
378  // attribute value.  If there is at least one form field that specifies an
379  // autocomplete type hint, don't try to apply other heuristics to match fields
380  // in this form.
381  bool has_author_specified_sections;
382  ParseFieldTypesFromAutocompleteAttributes(&has_author_specified_types_,
383                                            &has_author_specified_sections);
384
385  if (!has_author_specified_types_) {
386    ServerFieldTypeMap field_type_map;
387    FormField::ParseFormFields(fields_.get(), &field_type_map);
388    for (size_t i = 0; i < field_count(); ++i) {
389      AutofillField* field = fields_[i];
390      ServerFieldTypeMap::iterator iter =
391          field_type_map.find(field->unique_name());
392      if (iter != field_type_map.end())
393        field->set_heuristic_type(iter->second);
394    }
395  }
396
397  UpdateAutofillCount();
398  IdentifySections(has_author_specified_sections);
399
400  if (IsAutofillable(true)) {
401    metric_logger.LogDeveloperEngagementMetric(
402        AutofillMetrics::FILLABLE_FORM_PARSED);
403    if (has_author_specified_types_) {
404      metric_logger.LogDeveloperEngagementMetric(
405          AutofillMetrics::FILLABLE_FORM_CONTAINS_TYPE_HINTS);
406    }
407  }
408}
409
410bool FormStructure::EncodeUploadRequest(
411    const ServerFieldTypeSet& available_field_types,
412    bool form_was_autofilled,
413    std::string* encoded_xml) const {
414  DCHECK(ShouldBeCrowdsourced());
415
416  // Verify that |available_field_types| agrees with the possible field types we
417  // are uploading.
418  for (std::vector<AutofillField*>::const_iterator field = begin();
419       field != end();
420       ++field) {
421    for (ServerFieldTypeSet::const_iterator type =
422             (*field)->possible_types().begin();
423         type != (*field)->possible_types().end();
424         ++type) {
425      DCHECK(*type == UNKNOWN_TYPE ||
426             *type == EMPTY_TYPE ||
427             available_field_types.count(*type));
428    }
429  }
430
431  // Set up the <autofillupload> element and its attributes.
432  buzz::XmlElement autofill_request_xml(
433      (buzz::QName(kXMLElementAutofillUpload)));
434  autofill_request_xml.SetAttr(buzz::QName(kAttributeClientVersion),
435                               kClientVersion);
436  autofill_request_xml.SetAttr(buzz::QName(kAttributeFormSignature),
437                               FormSignature());
438  autofill_request_xml.SetAttr(buzz::QName(kAttributeAutofillUsed),
439                               form_was_autofilled ? "true" : "false");
440  autofill_request_xml.SetAttr(buzz::QName(kAttributeDataPresent),
441                               EncodeFieldTypes(available_field_types).c_str());
442
443  if (!EncodeFormRequest(FormStructure::UPLOAD, &autofill_request_xml))
444    return false;  // Malformed form, skip it.
445
446  // Obtain the XML structure as a string.
447  *encoded_xml = kXMLDeclaration;
448  *encoded_xml += autofill_request_xml.Str().c_str();
449
450  // To enable this logging, run with the flag --vmodule="form_structure=2".
451  VLOG(2) << "\n" << *encoded_xml;
452
453  return true;
454}
455
456bool FormStructure::EncodeFieldAssignments(
457    const ServerFieldTypeSet& available_field_types,
458    std::string* encoded_xml) const {
459  DCHECK(ShouldBeCrowdsourced());
460
461  // Set up the <fieldassignments> element and its attributes.
462  buzz::XmlElement autofill_request_xml(
463      (buzz::QName(kXMLElementFieldAssignments)));
464  autofill_request_xml.SetAttr(buzz::QName(kAttributeFormSignature),
465                               FormSignature());
466
467  if (!EncodeFormRequest(FormStructure::FIELD_ASSIGNMENTS,
468                         &autofill_request_xml))
469    return false;  // Malformed form, skip it.
470
471  // Obtain the XML structure as a string.
472  *encoded_xml = kXMLDeclaration;
473  *encoded_xml += autofill_request_xml.Str().c_str();
474
475  return true;
476}
477
478// static
479bool FormStructure::EncodeQueryRequest(
480    const std::vector<FormStructure*>& forms,
481    std::vector<std::string>* encoded_signatures,
482    std::string* encoded_xml) {
483  DCHECK(encoded_signatures);
484  DCHECK(encoded_xml);
485  encoded_xml->clear();
486  encoded_signatures->clear();
487  encoded_signatures->reserve(forms.size());
488
489  // Set up the <autofillquery> element and attributes.
490  buzz::XmlElement autofill_request_xml(
491      (buzz::QName(kXMLElementAutofillQuery)));
492  autofill_request_xml.SetAttr(buzz::QName(kAttributeClientVersion),
493                               kClientVersion);
494
495  // autocheckout_url_prefix tells the Autofill server where the forms in the
496  // request came from, and the the Autofill server checks internal status and
497  // decide to enable Autocheckout or not and may return Autocheckout related
498  // data in the response accordingly.
499  // There is no page/frame level object associated with FormStructure that
500  // we could extract URL prefix from. But, all the forms should come from the
501  // same frame, so they should have the same Autocheckout URL prefix. Thus we
502  // use URL prefix from the first form with Autocheckout enabled.
503  std::string autocheckout_url_prefix;
504
505  // Some badly formatted web sites repeat forms - detect that and encode only
506  // one form as returned data would be the same for all the repeated forms.
507  std::set<std::string> processed_forms;
508  for (ScopedVector<FormStructure>::const_iterator it = forms.begin();
509       it != forms.end();
510       ++it) {
511    std::string signature((*it)->FormSignature());
512    if (processed_forms.find(signature) != processed_forms.end())
513      continue;
514    processed_forms.insert(signature);
515    scoped_ptr<buzz::XmlElement> encompassing_xml_element(
516        new buzz::XmlElement(buzz::QName(kXMLElementForm)));
517    encompassing_xml_element->SetAttr(buzz::QName(kAttributeSignature),
518                                      signature);
519
520    if (!(*it)->EncodeFormRequest(FormStructure::QUERY,
521                                  encompassing_xml_element.get()))
522      continue;  // Malformed form, skip it.
523
524    if ((*it)->IsAutocheckoutEnabled()) {
525      if (autocheckout_url_prefix.empty()) {
526        autocheckout_url_prefix = (*it)->autocheckout_url_prefix_;
527      } else {
528        // Making sure all the forms in the request has the same url_prefix.
529        DCHECK_EQ(autocheckout_url_prefix, (*it)->autocheckout_url_prefix_);
530      }
531    }
532
533    autofill_request_xml.AddElement(encompassing_xml_element.release());
534    encoded_signatures->push_back(signature);
535  }
536
537  if (!encoded_signatures->size())
538    return false;
539
540  if (autocheckout_url_prefix.empty()) {
541    autofill_request_xml.SetAttr(buzz::QName(kAttributeAcceptedFeatures),
542                                 kAcceptedFeaturesExperiment);
543  } else {
544    autofill_request_xml.SetAttr(buzz::QName(kAttributeAcceptedFeatures),
545                                 kAcceptedFeaturesAutocheckoutExperiment);
546    autofill_request_xml.SetAttr(buzz::QName(kAttributeUrlprefixSignature),
547                                 Hash64Bit(autocheckout_url_prefix));
548  }
549
550  // Obtain the XML structure as a string.
551  *encoded_xml = kXMLDeclaration;
552  *encoded_xml += autofill_request_xml.Str().c_str();
553
554  return true;
555}
556
557// static
558void FormStructure::ParseQueryResponse(
559    const std::string& response_xml,
560    const std::vector<FormStructure*>& forms,
561    autofill::AutocheckoutPageMetaData* page_meta_data,
562    const AutofillMetrics& metric_logger) {
563  metric_logger.LogServerQueryMetric(AutofillMetrics::QUERY_RESPONSE_RECEIVED);
564
565  // Parse the field types from the server response to the query.
566  std::vector<AutofillServerFieldInfo> field_infos;
567  UploadRequired upload_required;
568  std::string experiment_id;
569  AutofillQueryXmlParser parse_handler(&field_infos,
570                                       &upload_required,
571                                       &experiment_id,
572                                       page_meta_data);
573  buzz::XmlParser parser(&parse_handler);
574  parser.Parse(response_xml.c_str(), response_xml.length(), true);
575  if (!parse_handler.succeeded())
576    return;
577
578  metric_logger.LogServerQueryMetric(AutofillMetrics::QUERY_RESPONSE_PARSED);
579  metric_logger.LogServerExperimentIdForQuery(experiment_id);
580
581  bool heuristics_detected_fillable_field = false;
582  bool query_response_overrode_heuristics = false;
583
584  // Copy the field types into the actual form.
585  std::vector<AutofillServerFieldInfo>::iterator current_info =
586      field_infos.begin();
587  for (std::vector<FormStructure*>::const_iterator iter = forms.begin();
588       iter != forms.end(); ++iter) {
589    FormStructure* form = *iter;
590    form->upload_required_ = upload_required;
591    form->server_experiment_id_ = experiment_id;
592
593    for (std::vector<AutofillField*>::iterator field = form->fields_.begin();
594         field != form->fields_.end(); ++field) {
595      if (form->ShouldSkipField(**field))
596        continue;
597
598      // In some cases *successful* response does not return all the fields.
599      // Quit the update of the types then.
600      if (current_info == field_infos.end())
601        break;
602
603      // UNKNOWN_TYPE is reserved for use by the client.
604      DCHECK_NE(current_info->field_type, UNKNOWN_TYPE);
605
606      ServerFieldType heuristic_type = (*field)->heuristic_type();
607      if (heuristic_type != UNKNOWN_TYPE)
608        heuristics_detected_fillable_field = true;
609
610      (*field)->set_server_type(current_info->field_type);
611      if (heuristic_type != (*field)->Type().GetStorableType())
612        query_response_overrode_heuristics = true;
613
614      // Copy default value into the field if available.
615      if (!current_info->default_value.empty())
616        (*field)->set_default_value(current_info->default_value);
617
618      ++current_info;
619    }
620
621    form->UpdateAutofillCount();
622    form->IdentifySections(false);
623  }
624
625  AutofillMetrics::ServerQueryMetric metric;
626  if (query_response_overrode_heuristics) {
627    if (heuristics_detected_fillable_field) {
628      metric = AutofillMetrics::QUERY_RESPONSE_OVERRODE_LOCAL_HEURISTICS;
629    } else {
630      metric = AutofillMetrics::QUERY_RESPONSE_WITH_NO_LOCAL_HEURISTICS;
631    }
632  } else {
633    metric = AutofillMetrics::QUERY_RESPONSE_MATCHED_LOCAL_HEURISTICS;
634  }
635  metric_logger.LogServerQueryMetric(metric);
636}
637
638// static
639void FormStructure::GetFieldTypePredictions(
640    const std::vector<FormStructure*>& form_structures,
641    std::vector<FormDataPredictions>* forms) {
642  forms->clear();
643  forms->reserve(form_structures.size());
644  for (size_t i = 0; i < form_structures.size(); ++i) {
645    FormStructure* form_structure = form_structures[i];
646    FormDataPredictions form;
647    form.data.name = form_structure->form_name_;
648    form.data.method =
649        ASCIIToUTF16((form_structure->method_ == POST) ? "POST" : "GET");
650    form.data.origin = form_structure->source_url_;
651    form.data.action = form_structure->target_url_;
652    form.signature = form_structure->FormSignature();
653    form.experiment_id = form_structure->server_experiment_id_;
654
655    for (std::vector<AutofillField*>::const_iterator field =
656             form_structure->fields_.begin();
657         field != form_structure->fields_.end(); ++field) {
658      form.data.fields.push_back(FormFieldData(**field));
659
660      FormFieldDataPredictions annotated_field;
661      annotated_field.signature = (*field)->FieldSignature();
662      annotated_field.heuristic_type =
663          AutofillType((*field)->heuristic_type()).ToString();
664      annotated_field.server_type =
665          AutofillType((*field)->server_type()).ToString();
666      annotated_field.overall_type = (*field)->Type().ToString();
667      form.fields.push_back(annotated_field);
668    }
669
670    forms->push_back(form);
671  }
672}
673
674std::string FormStructure::FormSignature() const {
675  std::string scheme(target_url_.scheme());
676  std::string host(target_url_.host());
677
678  // If target host or scheme is empty, set scheme and host of source url.
679  // This is done to match the Toolbar's behavior.
680  if (scheme.empty() || host.empty()) {
681    scheme = source_url_.scheme();
682    host = source_url_.host();
683  }
684
685  std::string form_string = scheme + "://" + host + "&" +
686                            UTF16ToUTF8(form_name_) +
687                            form_signature_field_names_;
688
689  return Hash64Bit(form_string);
690}
691
692bool FormStructure::IsAutocheckoutEnabled() const {
693  return !autocheckout_url_prefix_.empty();
694}
695
696bool FormStructure::ShouldSkipField(const FormFieldData& field) const {
697  return (field.is_checkable || field.form_control_type == "password") &&
698      !IsAutocheckoutEnabled();
699}
700
701size_t FormStructure::RequiredFillableFields() const {
702  return IsAutocheckoutEnabled() ? 0 : kRequiredAutofillFields;
703}
704
705bool FormStructure::IsAutofillable(bool require_method_post) const {
706  if (autofill_count() < RequiredFillableFields())
707    return false;
708
709  return ShouldBeParsed(require_method_post);
710}
711
712void FormStructure::UpdateAutofillCount() {
713  autofill_count_ = 0;
714  for (std::vector<AutofillField*>::const_iterator iter = begin();
715       iter != end(); ++iter) {
716    AutofillField* field = *iter;
717    if (field && field->IsFieldFillable())
718      ++autofill_count_;
719  }
720}
721
722bool FormStructure::ShouldBeParsed(bool require_method_post) const {
723  if (active_field_count() < RequiredFillableFields())
724    return false;
725
726  // Rule out http(s)://*/search?...
727  //  e.g. http://www.google.com/search?q=...
728  //       http://search.yahoo.com/search?p=...
729  if (target_url_.path() == "/search")
730    return false;
731
732  if (!IsAutocheckoutEnabled()) {
733    // Make sure there is at least one text field when Autocheckout is
734    // not enabled.
735    bool has_text_field = false;
736    for (std::vector<AutofillField*>::const_iterator it = begin();
737         it != end() && !has_text_field; ++it) {
738      has_text_field |= (*it)->form_control_type != "select-one";
739    }
740    if (!has_text_field)
741      return false;
742  }
743
744  return !require_method_post || (method_ == POST);
745}
746
747bool FormStructure::ShouldBeCrowdsourced() const {
748  // Allow all forms in Autocheckout flow to be crowdsourced.
749  return (!has_author_specified_types_ && ShouldBeParsed(true)) ||
750      IsAutocheckoutEnabled();
751}
752
753void FormStructure::UpdateFromCache(const FormStructure& cached_form) {
754  // Map from field signatures to cached fields.
755  std::map<std::string, const AutofillField*> cached_fields;
756  for (size_t i = 0; i < cached_form.field_count(); ++i) {
757    const AutofillField* field = cached_form.field(i);
758    cached_fields[field->FieldSignature()] = field;
759  }
760
761  for (std::vector<AutofillField*>::const_iterator iter = begin();
762       iter != end(); ++iter) {
763    AutofillField* field = *iter;
764
765    std::map<std::string, const AutofillField*>::const_iterator
766        cached_field = cached_fields.find(field->FieldSignature());
767    if (cached_field != cached_fields.end()) {
768      if (field->form_control_type != "select-one" &&
769          field->value == cached_field->second->value) {
770        // From the perspective of learning user data, text fields containing
771        // default values are equivalent to empty fields.
772        field->value = base::string16();
773      }
774
775      field->set_heuristic_type(cached_field->second->heuristic_type());
776      field->set_server_type(cached_field->second->server_type());
777    }
778  }
779
780  UpdateAutofillCount();
781
782  filled_by_autocheckout_ = cached_form.filled_by_autocheckout();
783  server_experiment_id_ = cached_form.server_experiment_id();
784
785  // The form signature should match between query and upload requests to the
786  // server. On many websites, form elements are dynamically added, removed, or
787  // rearranged via JavaScript between page load and form submission, so we
788  // copy over the |form_signature_field_names_| corresponding to the query
789  // request.
790  DCHECK_EQ(cached_form.form_name_, form_name_);
791  DCHECK_EQ(cached_form.source_url_, source_url_);
792  DCHECK_EQ(cached_form.target_url_, target_url_);
793  form_signature_field_names_ = cached_form.form_signature_field_names_;
794}
795
796void FormStructure::LogQualityMetrics(
797    const AutofillMetrics& metric_logger,
798    const base::TimeTicks& load_time,
799    const base::TimeTicks& interaction_time,
800    const base::TimeTicks& submission_time) const {
801  std::string experiment_id = server_experiment_id();
802  metric_logger.LogServerExperimentIdForUpload(experiment_id);
803
804  size_t num_detected_field_types = 0;
805  bool did_autofill_all_possible_fields = true;
806  bool did_autofill_some_possible_fields = false;
807  for (size_t i = 0; i < field_count(); ++i) {
808    const AutofillField* field = this->field(i);
809    metric_logger.LogQualityMetric(AutofillMetrics::FIELD_SUBMITTED,
810                                   experiment_id);
811
812    // No further logging for empty fields nor for fields where the entered data
813    // does not appear to already exist in the user's stored Autofill data.
814    const ServerFieldTypeSet& field_types = field->possible_types();
815    DCHECK(!field_types.empty());
816    if (field_types.count(EMPTY_TYPE) || field_types.count(UNKNOWN_TYPE))
817      continue;
818
819    ++num_detected_field_types;
820    if (field->is_autofilled)
821      did_autofill_some_possible_fields = true;
822    else
823      did_autofill_all_possible_fields = false;
824
825    // Collapse field types that Chrome treats as identical, e.g. home and
826    // billing address fields.
827    ServerFieldTypeSet collapsed_field_types;
828    for (ServerFieldTypeSet::const_iterator it = field_types.begin();
829         it != field_types.end();
830         ++it) {
831      // Since we currently only support US phone numbers, the (city code + main
832      // digits) number is almost always identical to the whole phone number.
833      // TODO(isherman): Improve this logic once we add support for
834      // international numbers.
835      if (*it == PHONE_HOME_CITY_AND_NUMBER)
836        collapsed_field_types.insert(PHONE_HOME_WHOLE_NUMBER);
837      else
838        collapsed_field_types.insert(AutofillType(*it).GetStorableType());
839    }
840
841    // Capture the field's type, if it is unambiguous.
842    ServerFieldType field_type = UNKNOWN_TYPE;
843    if (collapsed_field_types.size() == 1)
844      field_type = *collapsed_field_types.begin();
845
846    ServerFieldType heuristic_type =
847        AutofillType(field->heuristic_type()).GetStorableType();
848    ServerFieldType server_type =
849        AutofillType(field->server_type()).GetStorableType();
850    ServerFieldType predicted_type = field->Type().GetStorableType();
851
852    // Log heuristic, server, and overall type quality metrics, independently of
853    // whether the field was autofilled.
854    if (heuristic_type == UNKNOWN_TYPE) {
855      metric_logger.LogHeuristicTypePrediction(AutofillMetrics::TYPE_UNKNOWN,
856                                               field_type, experiment_id);
857    } else if (field_types.count(heuristic_type)) {
858      metric_logger.LogHeuristicTypePrediction(AutofillMetrics::TYPE_MATCH,
859                                               field_type, experiment_id);
860    } else {
861      metric_logger.LogHeuristicTypePrediction(AutofillMetrics::TYPE_MISMATCH,
862                                               field_type, experiment_id);
863    }
864
865    if (server_type == NO_SERVER_DATA) {
866      metric_logger.LogServerTypePrediction(AutofillMetrics::TYPE_UNKNOWN,
867                                            field_type, experiment_id);
868    } else if (field_types.count(server_type)) {
869      metric_logger.LogServerTypePrediction(AutofillMetrics::TYPE_MATCH,
870                                            field_type, experiment_id);
871    } else {
872      metric_logger.LogServerTypePrediction(AutofillMetrics::TYPE_MISMATCH,
873                                            field_type, experiment_id);
874    }
875
876    if (predicted_type == UNKNOWN_TYPE) {
877      metric_logger.LogOverallTypePrediction(AutofillMetrics::TYPE_UNKNOWN,
878                                             field_type, experiment_id);
879    } else if (field_types.count(predicted_type)) {
880      metric_logger.LogOverallTypePrediction(AutofillMetrics::TYPE_MATCH,
881                                             field_type, experiment_id);
882    } else {
883      metric_logger.LogOverallTypePrediction(AutofillMetrics::TYPE_MISMATCH,
884                                             field_type, experiment_id);
885    }
886
887    // TODO(isherman): <select> fields don't support |is_autofilled()|, so we
888    // have to skip them for the remaining metrics.
889    if (field->form_control_type == "select-one")
890      continue;
891
892    if (field->is_autofilled) {
893      metric_logger.LogQualityMetric(AutofillMetrics::FIELD_AUTOFILLED,
894                                     experiment_id);
895    } else {
896      metric_logger.LogQualityMetric(AutofillMetrics::FIELD_NOT_AUTOFILLED,
897                                     experiment_id);
898
899      if (heuristic_type == UNKNOWN_TYPE) {
900        metric_logger.LogQualityMetric(
901            AutofillMetrics::NOT_AUTOFILLED_HEURISTIC_TYPE_UNKNOWN,
902            experiment_id);
903      } else if (field_types.count(heuristic_type)) {
904        metric_logger.LogQualityMetric(
905            AutofillMetrics::NOT_AUTOFILLED_HEURISTIC_TYPE_MATCH,
906            experiment_id);
907      } else {
908        metric_logger.LogQualityMetric(
909            AutofillMetrics::NOT_AUTOFILLED_HEURISTIC_TYPE_MISMATCH,
910            experiment_id);
911      }
912
913      if (server_type == NO_SERVER_DATA) {
914        metric_logger.LogQualityMetric(
915            AutofillMetrics::NOT_AUTOFILLED_SERVER_TYPE_UNKNOWN,
916            experiment_id);
917      } else if (field_types.count(server_type)) {
918        metric_logger.LogQualityMetric(
919            AutofillMetrics::NOT_AUTOFILLED_SERVER_TYPE_MATCH,
920            experiment_id);
921      } else {
922        metric_logger.LogQualityMetric(
923            AutofillMetrics::NOT_AUTOFILLED_SERVER_TYPE_MISMATCH,
924            experiment_id);
925      }
926    }
927  }
928
929  if (num_detected_field_types < RequiredFillableFields()) {
930    metric_logger.LogUserHappinessMetric(
931        AutofillMetrics::SUBMITTED_NON_FILLABLE_FORM);
932  } else {
933    if (did_autofill_all_possible_fields) {
934      metric_logger.LogUserHappinessMetric(
935          AutofillMetrics::SUBMITTED_FILLABLE_FORM_AUTOFILLED_ALL);
936    } else if (did_autofill_some_possible_fields) {
937      metric_logger.LogUserHappinessMetric(
938          AutofillMetrics::SUBMITTED_FILLABLE_FORM_AUTOFILLED_SOME);
939    } else {
940      metric_logger.LogUserHappinessMetric(
941          AutofillMetrics::SUBMITTED_FILLABLE_FORM_AUTOFILLED_NONE);
942    }
943
944    // Unlike the other times, the |submission_time| should always be available.
945    DCHECK(!submission_time.is_null());
946
947    // The |load_time| might be unset, in the case that the form was dynamically
948    // added to the DOM.
949    if (!load_time.is_null()) {
950      // Submission should always chronologically follow form load.
951      DCHECK(submission_time > load_time);
952      base::TimeDelta elapsed = submission_time - load_time;
953      if (did_autofill_some_possible_fields)
954        metric_logger.LogFormFillDurationFromLoadWithAutofill(elapsed);
955      else
956        metric_logger.LogFormFillDurationFromLoadWithoutAutofill(elapsed);
957    }
958
959    // The |interaction_time| might be unset, in the case that the user
960    // submitted a blank form.
961    if (!interaction_time.is_null()) {
962      // Submission should always chronologically follow interaction.
963      DCHECK(submission_time > interaction_time);
964      base::TimeDelta elapsed = submission_time - interaction_time;
965      if (did_autofill_some_possible_fields) {
966        metric_logger.LogFormFillDurationFromInteractionWithAutofill(elapsed);
967      } else {
968        metric_logger.LogFormFillDurationFromInteractionWithoutAutofill(
969            elapsed);
970      }
971    }
972  }
973}
974
975const AutofillField* FormStructure::field(size_t index) const {
976  if (index >= fields_.size()) {
977    NOTREACHED();
978    return NULL;
979  }
980
981  return fields_[index];
982}
983
984AutofillField* FormStructure::field(size_t index) {
985  return const_cast<AutofillField*>(
986      static_cast<const FormStructure*>(this)->field(index));
987}
988
989size_t FormStructure::field_count() const {
990  return fields_.size();
991}
992
993size_t FormStructure::active_field_count() const {
994  return active_field_count_;
995}
996
997std::string FormStructure::server_experiment_id() const {
998  return server_experiment_id_;
999}
1000
1001FormData FormStructure::ToFormData() const {
1002  // |data.user_submitted| will always be false.
1003  FormData data;
1004  data.name = form_name_;
1005  data.origin = source_url_;
1006  data.action = target_url_;
1007  data.method = ASCIIToUTF16(method_ == POST ? "POST" : "GET");
1008
1009  for (size_t i = 0; i < fields_.size(); ++i) {
1010    data.fields.push_back(FormFieldData(*fields_[i]));
1011  }
1012
1013  return data;
1014}
1015
1016bool FormStructure::operator==(const FormData& form) const {
1017  // TODO(jhawkins): Is this enough to differentiate a form?
1018  if (form_name_ == form.name &&
1019      source_url_ == form.origin &&
1020      target_url_ == form.action) {
1021    return true;
1022  }
1023
1024  // TODO(jhawkins): Compare field names, IDs and labels once we have labels
1025  // set up.
1026
1027  return false;
1028}
1029
1030bool FormStructure::operator!=(const FormData& form) const {
1031  return !operator==(form);
1032}
1033
1034std::string FormStructure::Hash64Bit(const std::string& str) {
1035  std::string hash_bin = base::SHA1HashString(str);
1036  DCHECK_EQ(20U, hash_bin.length());
1037
1038  uint64 hash64 = (((static_cast<uint64>(hash_bin[0])) & 0xFF) << 56) |
1039                  (((static_cast<uint64>(hash_bin[1])) & 0xFF) << 48) |
1040                  (((static_cast<uint64>(hash_bin[2])) & 0xFF) << 40) |
1041                  (((static_cast<uint64>(hash_bin[3])) & 0xFF) << 32) |
1042                  (((static_cast<uint64>(hash_bin[4])) & 0xFF) << 24) |
1043                  (((static_cast<uint64>(hash_bin[5])) & 0xFF) << 16) |
1044                  (((static_cast<uint64>(hash_bin[6])) & 0xFF) << 8) |
1045                   ((static_cast<uint64>(hash_bin[7])) & 0xFF);
1046
1047  return base::Uint64ToString(hash64);
1048}
1049
1050bool FormStructure::EncodeFormRequest(
1051    FormStructure::EncodeRequestType request_type,
1052    buzz::XmlElement* encompassing_xml_element) const {
1053  if (!field_count())  // Nothing to add.
1054    return false;
1055
1056  // Some badly formatted web sites repeat fields - limit number of fields to
1057  // 48, which is far larger than any valid form and XML still fits into 2K.
1058  // Do not send requests for forms with more than this many fields, as they are
1059  // near certainly not valid/auto-fillable.
1060  const size_t kMaxFieldsOnTheForm = 48;
1061  if (field_count() > kMaxFieldsOnTheForm)
1062    return false;
1063
1064  // Add the child nodes for the form fields.
1065  for (size_t index = 0; index < field_count(); ++index) {
1066    const AutofillField* field = fields_[index];
1067    switch (request_type) {
1068      case FormStructure::UPLOAD:
1069        EncodeFieldForUpload(*field, encompassing_xml_element);
1070        break;
1071      case FormStructure::QUERY:
1072        if (ShouldSkipField(*field))
1073          continue;
1074        EncodeFieldForQuery(*field, encompassing_xml_element);
1075        break;
1076      case FormStructure::FIELD_ASSIGNMENTS:
1077        EncodeFieldForFieldAssignments(*field, encompassing_xml_element);
1078        break;
1079    }
1080  }
1081  return true;
1082}
1083
1084void FormStructure::ParseFieldTypesFromAutocompleteAttributes(
1085    bool* found_types,
1086    bool* found_sections) {
1087  const std::string kDefaultSection = "-default";
1088
1089  *found_types = false;
1090  *found_sections = false;
1091  for (std::vector<AutofillField*>::iterator it = fields_.begin();
1092       it != fields_.end(); ++it) {
1093    AutofillField* field = *it;
1094
1095    // To prevent potential section name collisions, add a default suffix for
1096    // other fields.  Without this, 'autocomplete' attribute values
1097    // "section--shipping street-address" and "shipping street-address" would be
1098    // parsed identically, given the section handling code below.  We do this
1099    // before any validation so that fields with invalid attributes still end up
1100    // in the default section.  These default section names will be overridden
1101    // by subsequent heuristic parsing steps if there are no author-specified
1102    // section names.
1103    field->set_section(kDefaultSection);
1104
1105    // Canonicalize the attribute value by trimming whitespace, collapsing
1106    // non-space characters (e.g. tab) to spaces, and converting to lowercase.
1107    std::string autocomplete_attribute =
1108        CollapseWhitespaceASCII(field->autocomplete_attribute, false);
1109    autocomplete_attribute = StringToLowerASCII(autocomplete_attribute);
1110
1111    // The autocomplete attribute is overloaded: it can specify either a field
1112    // type hint or whether autocomplete should be enabled at all.  Ignore the
1113    // latter type of attribute value.
1114    if (autocomplete_attribute.empty() ||
1115        autocomplete_attribute == "on" ||
1116        autocomplete_attribute == "off") {
1117      continue;
1118    }
1119
1120    // Any other value, even it is invalid, is considered to be a type hint.
1121    // This allows a website's author to specify an attribute like
1122    // autocomplete="other" on a field to disable all Autofill heuristics for
1123    // the form.
1124    *found_types = true;
1125
1126    // Tokenize the attribute value.  Per the spec, the tokens are parsed in
1127    // reverse order.
1128    std::vector<std::string> tokens;
1129    Tokenize(autocomplete_attribute, " ", &tokens);
1130
1131    // The final token must be the field type.
1132    // If it is not one of the known types, abort.
1133    DCHECK(!tokens.empty());
1134    std::string field_type_token = tokens.back();
1135    tokens.pop_back();
1136    HtmlFieldType field_type =
1137        FieldTypeFromAutocompleteAttributeValue(field_type_token, *field);
1138    if (field_type == HTML_TYPE_UNKNOWN)
1139      continue;
1140
1141    // The preceding token, if any, may be a type hint.
1142    if (!tokens.empty() && IsContactTypeHint(tokens.back())) {
1143      // If it is, it must match the field type; otherwise, abort.
1144      // Note that an invalid token invalidates the entire attribute value, even
1145      // if the other tokens are valid.
1146      if (!ContactTypeHintMatchesFieldType(tokens.back(), field_type))
1147        continue;
1148
1149      // Chrome Autofill ignores these type hints.
1150      tokens.pop_back();
1151    }
1152
1153    // The preceding token, if any, may be a fixed string that is either
1154    // "shipping" or "billing".  Chrome Autofill treats these as implicit
1155    // section name suffixes.
1156    DCHECK_EQ(kDefaultSection, field->section());
1157    std::string section = field->section();
1158    HtmlFieldMode mode = HTML_MODE_NONE;
1159    if (!tokens.empty()) {
1160      if (tokens.back() == kShippingMode)
1161        mode = HTML_MODE_SHIPPING;
1162      else if (tokens.back() == kBillingMode)
1163        mode = HTML_MODE_BILLING;
1164    }
1165
1166    if (mode != HTML_MODE_NONE) {
1167      section = "-" + tokens.back();
1168      tokens.pop_back();
1169    }
1170
1171    // The preceding token, if any, may be a named section.
1172    const std::string kSectionPrefix = "section-";
1173    if (!tokens.empty() &&
1174        StartsWithASCII(tokens.back(), kSectionPrefix, true)) {
1175      // Prepend this section name to the suffix set in the preceding block.
1176      section = tokens.back().substr(kSectionPrefix.size()) + section;
1177      tokens.pop_back();
1178    }
1179
1180    // No other tokens are allowed.  If there are any remaining, abort.
1181    if (!tokens.empty())
1182      continue;
1183
1184    if (section != kDefaultSection) {
1185      *found_sections = true;
1186      field->set_section(section);
1187    }
1188
1189    // No errors encountered while parsing!
1190    // Update the |field|'s type based on what was parsed from the attribute.
1191    field->SetHtmlType(field_type, mode);
1192  }
1193}
1194
1195void FormStructure::IdentifySections(bool has_author_specified_sections) {
1196  if (fields_.empty())
1197    return;
1198
1199  if (!has_author_specified_sections) {
1200    // Name sections after the first field in the section.
1201    base::string16 current_section = fields_.front()->unique_name();
1202
1203    // Keep track of the types we've seen in this section.
1204    std::set<ServerFieldType> seen_types;
1205    ServerFieldType previous_type = UNKNOWN_TYPE;
1206
1207    for (std::vector<AutofillField*>::iterator field = fields_.begin();
1208         field != fields_.end(); ++field) {
1209      const ServerFieldType current_type = (*field)->Type().GetStorableType();
1210
1211      bool already_saw_current_type = seen_types.count(current_type) > 0;
1212
1213      // Forms often ask for multiple phone numbers -- e.g. both a daytime and
1214      // evening phone number.  Our phone number detection is also generally a
1215      // little off.  Hence, ignore this field type as a signal here.
1216      if (AutofillType(current_type).group() == PHONE_HOME)
1217        already_saw_current_type = false;
1218
1219      // Some forms have adjacent fields of the same type.  Two common examples:
1220      //  * Forms with two email fields, where the second is meant to "confirm"
1221      //    the first.
1222      //  * Forms with a <select> menu for states in some countries, and a
1223      //    freeform <input> field for states in other countries.  (Usually,
1224      //    only one of these two will be visible for any given choice of
1225      //    country.)
1226      // Generally, adjacent fields of the same type belong in the same logical
1227      // section.
1228      if (current_type == previous_type)
1229        already_saw_current_type = false;
1230
1231      previous_type = current_type;
1232
1233      if (current_type != UNKNOWN_TYPE && already_saw_current_type) {
1234        // We reached the end of a section, so start a new section.
1235        seen_types.clear();
1236        current_section = (*field)->unique_name();
1237      }
1238
1239      seen_types.insert(current_type);
1240      (*field)->set_section(UTF16ToUTF8(current_section));
1241    }
1242  }
1243
1244  // Ensure that credit card and address fields are in separate sections.
1245  // This simplifies the section-aware logic in autofill_manager.cc.
1246  for (std::vector<AutofillField*>::iterator field = fields_.begin();
1247       field != fields_.end(); ++field) {
1248    FieldTypeGroup field_type_group = (*field)->Type().group();
1249    if (field_type_group == CREDIT_CARD)
1250      (*field)->set_section((*field)->section() + "-cc");
1251    else
1252      (*field)->set_section((*field)->section() + "-default");
1253  }
1254}
1255
1256}  // namespace autofill
1257