From a4478cd677ebb1a3e40040b7cf60c48099009242 Mon Sep 17 00:00:00 2001
From: Petr Skoda <commits@skodak.org>
Date: Fri, 30 Dec 2011 14:13:35 +0100
Subject: [PATCH] MDL-29917 prevent form autocompletion in most Moodle forms

The password autocompletion in case of Moodle makes sense only on the login page, the form autocompletion in general is most probably useful only on the user signup page.

This patch is compatible with html 5, unfortunately we have to ignore strict warnings in legacy xhtml 1.0 standard.
---
 lib/form/password.php       | 10 ++++++++++
 lib/form/passwordunmask.php |  9 +++++++++
 lib/formslib.php            | 10 ++++++++++
 lib/javascript-static.js    |  5 +++--
 login/signup.php            |  2 +-
 5 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/lib/form/password.php b/lib/form/password.php
index 1883897edab..c157a47fad6 100644
--- a/lib/form/password.php
+++ b/lib/form/password.php
@@ -15,6 +15,16 @@ class MoodleQuickForm_password extends HTML_QuickForm_password{
      */
     var $_helpbutton='';
     function MoodleQuickForm_password($elementName=null, $elementLabel=null, $attributes=null) {
+        global $CFG;
+        if (empty($CFG->xmlstrictheaders)) {
+            // no standard mform in moodle should allow autocomplete of passwords
+            // this is valid attribute in html5, sorry, we have to ignore validation errors in legacy xhtml 1.0
+            $attributes = (array)$attributes;
+            if (!isset($attributes['autocomplete'])) {
+                $attributes['autocomplete'] = 'off';
+            }
+        }
+
         parent::HTML_QuickForm_password($elementName, $elementLabel, $attributes);
     }
     /**
diff --git a/lib/form/passwordunmask.php b/lib/form/passwordunmask.php
index b70f0d51f39..1f0b8045142 100644
--- a/lib/form/passwordunmask.php
+++ b/lib/form/passwordunmask.php
@@ -15,6 +15,15 @@ require_once($CFG->libdir.'/form/password.php');
 class MoodleQuickForm_passwordunmask extends MoodleQuickForm_password {
 
     function MoodleQuickForm_passwordunmask($elementName=null, $elementLabel=null, $attributes=null) {
+        global $CFG;
+        if (empty($CFG->xmlstrictheaders)) {
+            // no standard mform in moodle should allow autocomplete of passwords
+            // this is valid attribute in html5, sorry, we have to ignore validation errors in legacy xhtml 1.0
+            $attributes = (array)$attributes;
+            if (!isset($attributes['autocomplete'])) {
+                $attributes['autocomplete'] = 'off';
+            }
+        }
         parent::MoodleQuickForm_password($elementName, $elementLabel, $attributes);
     }
 
diff --git a/lib/formslib.php b/lib/formslib.php
index 929b000b79d..84af253bb5f 100644
--- a/lib/formslib.php
+++ b/lib/formslib.php
@@ -139,6 +139,16 @@ abstract class moodleform {
      * @return object moodleform
      */
     function moodleform($action=null, $customdata=null, $method='post', $target='', $attributes=null, $editable=true) {
+        global $CFG;
+        if (empty($CFG->xmlstrictheaders)) {
+            // no standard mform in moodle should allow autocomplete with the exception of user signup
+            // this is valid attribute in html5, sorry, we have to ignore validation errors in legacy xhtml 1.0
+            $attributes = (array)$attributes;
+            if (!isset($attributes['autocomplete'])) {
+                $attributes['autocomplete'] = 'off';
+            }
+        }
+
         if (empty($action)){
             $action = strip_querystring(qualified_me());
         }
diff --git a/lib/javascript-static.js b/lib/javascript-static.js
index a20699010f8..2cd826118ba 100644
--- a/lib/javascript-static.js
+++ b/lib/javascript-static.js
@@ -876,13 +876,14 @@ function unmaskPassword(id) {
   try {
     // first try IE way - it can not set name attribute later
     if (chb.checked) {
-      var newpw = document.createElement('<input type="text" name="'+pw.name+'">');
+      var newpw = document.createElement('<input type="text" autocomplete="off" name="'+pw.name+'">');
     } else {
-      var newpw = document.createElement('<input type="password" name="'+pw.name+'">');
+      var newpw = document.createElement('<input type="password" autocomplete="off" name="'+pw.name+'">');
     }
     newpw.attributes['class'].nodeValue = pw.attributes['class'].nodeValue;
   } catch (e) {
     var newpw = document.createElement('input');
+    newpw.setAttribute('autocomplete', 'off');
     newpw.setAttribute('name', pw.name);
     if (chb.checked) {
       newpw.setAttribute('type', 'text');
diff --git a/login/signup.php b/login/signup.php
index f3b83be65d3..fb27841c8b3 100644
--- a/login/signup.php
+++ b/login/signup.php
@@ -43,7 +43,7 @@ $PAGE->https_required();
 $PAGE->set_url('/login/signup.php');
 $PAGE->set_context(get_context_instance(CONTEXT_SYSTEM));
 
-$mform_signup = new login_signup_form();
+$mform_signup = new login_signup_form(null, null, 'post', '', array('autocomplete'=>'on'));
 
 if ($mform_signup->is_cancelled()) {
     redirect(get_login_url());