[Password Manager] Modified to support saving passwords on forms without username fields.

components/autofill/content/renderer/password_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/password_autofill_agent.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram.h"
@@ skipping 49 matching lines @@
   FormInputElementMap input_elements;
 };
 
 typedef std::vector<FormElements*> FormElementsList;
 
 // Helper to search the given form element for the specified input elements
 // in |data|, and add results to |result|.
 static bool FindFormInputElements(blink::WebFormElement* fe,
                                   const FormData& data,
                                   FormElements* result) {
+  // The password form may not contain a username field
+  // (http://crbug.com/406343), but continue autofilling password field.
+  size_t j = 0;

[vabr (Chromium), 2014/09/25 12:39:48]

Out of the for-loop, this looks a bit strange. What about replacing it with:

const bool username_is_present = !data.fields[0].name.empty();

and then phrasing the for-loop as

// First field is the username, skip it if not present.
for (size_t j = (username_is_present ? 1 : 0); j < data.fields.size(); ++j) {

[Pritam Nikam, 2014/09/25 13:38:18]

Done.

+  if (data.fields[0].name.empty())
+    ++j;
+
   // Loop through the list of elements we need to find on the form in order to
   // autofill it. If we don't find any one of them, abort processing this
   // form; it can't be the right one.
-  for (size_t j = 0; j < data.fields.size(); j++) {
+  for (; j < data.fields.size(); ++j) {
     blink::WebVector<blink::WebNode> temp_elements;
     fe->getNamedElements(data.fields[j].name, temp_elements);
 
     // Match the first input element, if any.
     // |getNamedElements| may return non-input elements where the names match,
     // so the results are filtered for input elements.
     // If more than one match is made, then we have ambiguity (due to misuse
     // of "name" attribute) so is it considered not found.
     bool found_input = false;
     for (size_t i = 0; i < temp_elements.size(); ++i) {
@@ skipping 127 matching lines @@
 
 // Log a message including the name, method and action of |form|.
 void LogHTMLForm(SavePasswordProgressLogger* logger,
                  SavePasswordProgressLogger::StringID message_id,
                  const blink::WebFormElement& form) {
   logger->LogHTMLForm(message_id,
                       form.name().utf8(),
                       GURL(form.action().utf8()));
 }
 
+bool FillDataContainsUsername(const PasswordFormFillData& fill_data) {
+  return !fill_data.basic_data.fields[0].name.empty();
+}
+
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
 // PasswordAutofillAgent, public:
 
 PasswordAutofillAgent::PasswordAutofillAgent(content::RenderView* render_view)
     : content::RenderViewObserver(render_view),
       usernames_usage_(NOTHING_TO_AUTOFILL),
       web_view_(render_view->GetWebView()),
       logging_state_active_(false),
@@ skipping 564 matching lines @@
   }
 
   FormElementsList forms;
   // We own the FormElements* in forms.
   FindFormElements(render_view()->GetWebView(), form_data.basic_data, &forms);
   FormElementsList::iterator iter;
   for (iter = forms.begin(); iter != forms.end(); ++iter) {
     scoped_ptr<FormElements> form_elements(*iter);
 
     // Attach autocomplete listener to enable selecting alternate logins.
-    // First, get pointers to username element.
-    blink::WebInputElement username_element =
-        form_elements->input_elements[form_data.basic_data.fields[0].name];
+    blink::WebInputElement username_element, password_element;
+
+    // Check whether the password form has a username input field.
+    bool form_contains_username_field = FillDataContainsUsername(form_data);
+    if (form_contains_username_field) {
+      username_element =
+          form_elements->input_elements[form_data.basic_data.fields[0].name];
+    }
+
+    // No password field, bail out.
+    if (form_data.basic_data.fields[1].name.empty())
+      break;
 
     // Get pointer to password element. (We currently only support single
     // password forms).
-    blink::WebInputElement password_element =
+    password_element =
         form_elements->input_elements[form_data.basic_data.fields[1].name];
 
     // If wait_for_username is true, we don't want to initially fill the form
     // until the user types in a valid username.
     if (!form_data.wait_for_username)
       FillFormOnPasswordRecieved(form_data, username_element, password_element);
 
     // We might have already filled this form if there are two <form> elements
     // with identical markup.
     if (login_to_password_info_.find(username_element) !=
         login_to_password_info_.end())
       continue;
 
     PasswordInfo password_info;
     password_info.fill_data = form_data;
     password_info.password_field = password_element;
     login_to_password_info_[username_element] = password_info;
     password_to_username_[password_element] = username_element;
 
     FormData form;
     FormFieldData field;
-    FindFormAndFieldForFormControlElement(
-        username_element, &form, &field, REQUIRE_NONE);
+    if (form_contains_username_field) {
+      FindFormAndFieldForFormControlElement(
+          username_element, &form, &field, REQUIRE_NONE);
+    }
+
     Send(new AutofillHostMsg_AddPasswordFormMapping(
         routing_id(), field, form_data));
   }
 }
 
 void PasswordAutofillAgent::OnSetLoggingState(bool active) {
   logging_state_active_ = active;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ skipping 77 matching lines @@
 
 void PasswordAutofillAgent::FillFormOnPasswordRecieved(
     const PasswordFormFillData& fill_data,
     blink::WebInputElement username_element,
     blink::WebInputElement password_element) {
   // Do not fill if the password field is in an iframe.
   DCHECK(password_element.document().frame());
   if (password_element.document().frame()->parent())
     return;
 
+  bool form_contains_username_field = FillDataContainsUsername(fill_data);
   if (!ShouldIgnoreAutocompleteOffForPasswordFields() &&
-      !username_element.form().autoComplete())
+      form_contains_username_field && !username_element.form().autoComplete())
     return;
 
   // If we can't modify the password, don't try to set the username
   if (!IsElementAutocompletable(password_element))
     return;
 
   // Try to set the username to the preferred name, but only if the field
   // can be set and isn't prefilled.
-  if (IsElementAutocompletable(username_element) &&
+  if (form_contains_username_field &&
+      IsElementAutocompletable(username_element) &&
       username_element.value().isEmpty()) {
     // TODO(tkent): Check maxlength and pattern.
     username_element.setValue(fill_data.basic_data.fields[0].value, true);
   }
 
   // Fill if we have an exact match for the username. Note that this sets
   // username to autofilled.
   FillUserNameAndPassword(&username_element,
                           &password_element,
                           fill_data,
                           true /* exact_username_match */,
                           false /* set_selection */);
 }
 
 bool PasswordAutofillAgent::FillUserNameAndPassword(
     blink::WebInputElement* username_element,
     blink::WebInputElement* password_element,
     const PasswordFormFillData& fill_data,
     bool exact_username_match,
     bool set_selection) {
-  base::string16 current_username = username_element->value();
+  // Don't fill username if password can't be set.
+  if (!IsElementAutocompletable(*password_element))
+    return false;
+
+  base::string16 current_username;
+  if (!username_element->isNull()) {
+    current_username = username_element->value();
+  }
+
   // username and password will contain the match found if any.
   base::string16 username;
   base::string16 password;
 
-  // Don't fill username if password can't be set.
-  if (!IsElementAutocompletable(*password_element))
-    return false;
-
   // Look for any suitable matches to current field text.
   if (DoUsernamesMatch(fill_data.basic_data.fields[0].value,
                        current_username,
                        exact_username_match)) {
     username = fill_data.basic_data.fields[0].value;
     password = fill_data.basic_data.fields[1].value;
   } else {
     // Scan additional logins for a match.
     PasswordFormFillData::LoginCollection::const_iterator iter;
     for (iter = fill_data.additional_logins.begin();
@@ skipping 27 matching lines @@
       }
     }
   }
   if (password.empty())
     return false;  // No match was found.
 
   // TODO(tkent): Check maxlength and pattern for both username and password
   // fields.
 
   // Input matches the username, fill in required values.
-  if (IsElementAutocompletable(*username_element)) {
+  if (!username_element->isNull() &&
+      IsElementAutocompletable(*username_element)) {
     username_element->setValue(username, true);
     username_element->setAutofilled(true);
 
     if (set_selection) {
       username_element->setSelectionRange(current_username.length(),
                                           username.length());
     }
   } else if (current_username != username) {
     // If the username can't be filled and it doesn't match a saved password
     // as is, don't autofill a password.
@@ skipping 37 matching lines @@
                           &password,
                           fill_data,
                           false /* exact_username_match */,
                           true /* set_selection */);
 #endif
 }
 
 void PasswordAutofillAgent::FrameClosing(const blink::WebFrame* frame) {
   for (LoginToPasswordInfoMap::iterator iter = login_to_password_info_.begin();
        iter != login_to_password_info_.end();) {
-    if (iter->first.document().frame() == frame) {
+    // There may not be a username field, so get the frame from the password
+    // field.
+    if (iter->second.password_field.document().frame() == frame) {
       password_to_username_.erase(iter->second.password_field);
       login_to_password_info_.erase(iter++);
     } else {
       ++iter;
     }
   }
   for (FrameToPasswordFormMap::iterator iter =
            provisionally_saved_forms_.begin();
        iter != provisionally_saved_forms_.end();) {
     if (iter->first == frame)
@@ skipping 46 matching lines @@
   scoped_ptr<PasswordForm> password_form(CreatePasswordForm(form));
   if (!password_form || (restriction == RESTRICTION_NON_EMPTY_PASSWORD &&
                          password_form->password_value.empty() &&
                          password_form->new_password_value.empty())) {
     return;
   }
   provisionally_saved_forms_[frame].reset(password_form.release());
 }
 
 }  // namespace autofill