[Password Manager] Enables processing invisible username fields even if visible password field was …

components/autofill/content/renderer/password_form_conversion_utils.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/password_form_conversion_utils.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 295 matching lines @@
 base::LazyInstance<re2::RE2, PasswordSiteUrlLazyInstanceTraits>
     g_password_site_matcher = LAZY_INSTANCE_INITIALIZER;
 
 // Returns the |input_field| name if its non-empty; otherwise a |dummy_name|.
 base::string16 FieldName(const WebInputElement& input_field,
                          const char dummy_name[]) {
   base::string16 field_name = input_field.nameForAutofill();
   return field_name.empty() ? base::ASCIIToUTF16(dummy_name) : field_name;
 }
 
-bool FormContainsVisiblePasswordFields(const SyntheticForm& form) {
+// Helper function that checks the presence of visible password and username
+// fields in |form.control_elements|.
+// Iff a visible password found, then |*found_visible_password| is set to true.
+// Iff a visible password found AND there is a visible username before it, then
+// |*found_visible_username_before_visible_password| is set to true.
+void FoundVisiblePasswordAndVisibleUsernameBeforePassword(
+    const SyntheticForm& form,
+    bool* found_visible_password,
+    bool* found_visible_username_before_visible_password) {
+  DCHECK(found_visible_password);
+  DCHECK(found_visible_username_before_visible_password);
+  *found_visible_password = false;
+  *found_visible_username_before_visible_password = false;
+
+  bool found_visible_username = false;
   for (auto& control_element : form.control_elements) {
     const WebInputElement* input_element = toWebInputElement(&control_element);
-    if (!input_element || !input_element->isEnabled())
+    if (!input_element || !input_element->isEnabled() ||
+        !input_element->isTextField())
       continue;
 
-    if (input_element->isPasswordField() &&
-        form_util::IsWebNodeVisible(*input_element))
-      return true;
+    if (!form_util::IsWebNodeVisible(*input_element))
+      continue;
+
+    if (input_element->isPasswordField()) {
+      *found_visible_password = true;
+      *found_visible_username_before_visible_password = found_visible_username;
+      break;
+    } else {
+      found_visible_username = true;
+    }
   }
-  return false;
 }
 
 // Get information about a login form encapsulated in a PasswordForm struct.
 // If an element of |form| has an entry in |nonscript_modified_values|, the
 // associated string is used instead of the element's value to create
 // the PasswordForm.
 bool GetPasswordForm(const SyntheticForm& form,
                      PasswordForm* password_form,
                      const ModifiedValues* nonscript_modified_values,
                      const FormsPredictionsMap* form_predictions) {
@@ skipping 13 matching lines @@
                                  form.control_elements)) {
     return false;
   }
 
   std::map<WebInputElement, PasswordFormFieldPredictionType> predicted_elements;
   if (form_predictions) {
     FindPredictedElements(form, password_form->form_data, *form_predictions,
                           &predicted_elements);
   }
 
+  // Check the presence of visible password and username fields.
+  // If there is a visible password field, then ignore invisible password
+  // fields. If there is a visible username before visible password, then ignore
+  // invisible username fields.
+  // If there is no visible password field, don't ignore any elements (i.e. use
+  // the latest username field just before selected password field).
+  bool ignore_invisible_passwords = false;
+  bool ignore_invisible_usernames = false;
+  FoundVisiblePasswordAndVisibleUsernameBeforePassword(
+      form, &ignore_invisible_passwords, &ignore_invisible_usernames);
   std::string layout_sequence;
   layout_sequence.reserve(form.control_elements.size());
-  bool ignore_invisible_fields = FormContainsVisiblePasswordFields(form);
   for (size_t i = 0; i < form.control_elements.size(); ++i) {
     WebFormControlElement control_element = form.control_elements[i];
 
     WebInputElement* input_element = toWebInputElement(&control_element);
     if (!input_element || !input_element->isEnabled())
       continue;
-    if (ignore_invisible_fields && !form_util::IsWebNodeVisible(*input_element))
-      continue;
+
+    bool element_is_invisible = !form_util::IsWebNodeVisible(*input_element);
     if (input_element->isTextField()) {
-      if (input_element->isPasswordField())
+      if (input_element->isPasswordField()) {
+        if (element_is_invisible && ignore_invisible_passwords)
+          continue;
         layout_sequence.push_back('P');
-      else
+      } else {
+        if (element_is_invisible && ignore_invisible_usernames)
+          continue;
         layout_sequence.push_back('N');
+      }
     }
 
     bool password_marked_by_autocomplete_attribute =
         HasAutocompleteAttributeValue(*input_element,
                                       kAutocompleteCurrentPassword) ||
         HasAutocompleteAttributeValue(*input_element, kAutocompleteNewPassword);
 
     // If the password field is readonly, the page is likely using a virtual
     // keyboard and bypassing the password field value (see
     // http://crbug.com/475488). There is nothing Chrome can do to fill
@@ skipping 266 matching lines @@
 }
 
 bool HasAutocompleteAttributeValue(const blink::WebInputElement& element,
                                    const char* value_in_lowercase) {
   return base::LowerCaseEqualsASCII(
       base::StringPiece16(element.getAttribute("autocomplete")),
       value_in_lowercase);
 }
 
 }  // namespace autofill