Index: install.php
===================================================================
RCS file: /cvs/drupal/drupal/install.php,v
retrieving revision 1.53
diff -u -p -r1.53 install.php
--- install.php	22 May 2007 07:42:36 -0000	1.53
+++ install.php	24 May 2007 10:22:40 -0000
@@ -818,6 +818,8 @@ function install_configure_form() {
   // This is necessary to add the task to the $_GET args so the install
   // system will know that it is done and we've taken over.
 
+  _user_password_dynamic_validation();
+
   $form['intro'] = array(
     '#value' => st('To configure your web site, please provide the following information.'),
     '#weight' => -10,
Index: includes/form.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/form.inc,v
retrieving revision 1.196
diff -u -p -r1.196 form.inc
--- includes/form.inc	16 May 2007 07:56:19 -0000	1.196
+++ includes/form.inc	24 May 2007 10:22:40 -0000
@@ -1198,11 +1198,13 @@ function expand_password_confirm($elemen
     '#type' => 'password',
     '#title' => t('Password'),
     '#value' => empty($element['#value']) ? NULL : $element['#value']['pass1'],
+    '#attributes' => array('class' => 'password-field'),
   );
   $element['pass2'] =  array(
     '#type' => 'password',
     '#title' => t('Confirm password'),
     '#value' => empty($element['#value']) ? NULL : $element['#value']['pass2'],
+    '#attributes' => array('class' => 'password-confirm'),
   );
   $element['#element_validate'] = array('password_confirm_validate');
   $element['#tree'] = TRUE;
Index: modules/system/system.css
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.css,v
retrieving revision 1.27
diff -u -p -r1.27 system.css
--- modules/system/system.css	20 May 2007 16:38:19 -0000	1.27
+++ modules/system/system.css	24 May 2007 10:22:40 -0000
@@ -33,7 +33,7 @@ thead th {
   padding-bottom: .5em
 }
 .error {
-  color: #f00;
+  color: #e55;
 }
 div.error {
   border: 1px solid #d77;
@@ -42,9 +42,21 @@ div.error, tr.error {
   background: #fcc;
   color: #200;
 }
+.warning {
+  color: #e0b010;
+}
+div.warning {
+  border: 1px solid #f0c020;
+}
 div.warning, tr.warning {
   background: #ffd;
 }
+.ok {
+  color: #0a0;
+}
+div.ok {
+  border: 1px solid #0a0;
+}
 div.ok, tr.ok {
   background: #dfd;
 }
@@ -446,3 +458,37 @@ thead div.sticky-header {
 html.js .js-hide {
   display: none;
 }
+
+/*
+** Password strength indicator
+*/
+span.password-strength {
+  visibility: hidden;
+}
+span.password-title {
+  font-weight: bold;
+}
+input.password-field {
+  margin-right: 10px;
+}
+.password-description {
+  padding: 0 0 0 2px;
+  margin: 4px 0 0 0;
+  font-size: 0.85em;
+  max-width: 500px;
+}
+.password-parent {
+  margin: 0 0 0 0;
+}
+/*
+** Password confirmation checker
+*/
+input.password-confirm {
+  margin-right: 10px;
+}
+.confirm-parent {
+  margin: 5px 0 0 0;
+}
+span.password-confirm {
+  visibility: hidden;
+}
Index: modules/user/user.js
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.js,v
retrieving revision 1.1
diff -u -p -r1.1 user.js
--- modules/user/user.js	20 May 2007 16:38:19 -0000	1.1
+++ modules/user/user.js	24 May 2007 10:22:40 -0000
@@ -1,6 +1,132 @@
 /* $Id: user.js,v 1.1 2007/05/20 16:38:19 dries Exp $ */
 
 /**
+ * Attach handlers to evaluate the strength of any password fields and to check
+ * that its confirmation is correct.
+ */
+Drupal.passwordAttach = function(context) {
+  var context = context || $(document);
+  var translate = Drupal.settings.password;
+  $("input.password-field", context).each(function() {
+    var passwordInput = $(this);
+    var parent = $(this).parent();
+    // Wait this number of milliseconds before checking password.
+    var monitorDelay = 300;
+
+    // Add the password strength layers.
+    $(this).after('<span class="password-strength"><span class="password-title">'+ translate.title +'</span> <span class="password-result"></span></span>').parent().after('<div class="password-description"></div>');
+    var passwordStrength = $(".password-strength", parent);
+    var passwordDescription = $(".password-description", $(this).parent().parent());
+    var passwordResult = $(".password-result", passwordStrength);
+    parent.addClass("password-parent");
+
+    // Add the password confirmation layer.
+    var outerItem  = $(this).parent().parent();
+    $("input.password-confirm", outerItem).after('<span class="password-confirm"></span>').parent().addClass("confirm-parent");
+    var confirmInput = $("input.password-confirm", outerItem);
+    var confirmResult = $("span.password-confirm", outerItem);
+
+    var passwordMonitor = function() {
+      if (this.timer) {
+        clearTimeout(this.timer);
+      }
+
+      this.timer = setTimeout(function() {
+        // Evaluate password strength.
+
+        if (!passwordInput.val()) {
+          // Password is empty so hide the password strength UI.
+          passwordStrength.css({ visibility: "hidden" });
+          passwordDescription.hide();
+        }
+        else {
+          passwordStrength.css({ visibility: "visible" });
+          passwordDescription.show();
+        }
+
+        var result = Drupal.evaluatePasswordStrength(passwordInput.val());
+        passwordResult.html(result.strength == "" ? "" : translate[result.strength +"Strength"]);
+        passwordDescription.html(result.message);
+
+        // Map the password strength to the relevant drupal CSS class.
+        var classMap = { low: "error", medium: "warning", high: "ok" };
+        var class = classMap[result.strength] || "";
+
+        // Remove the previous styling if any exists; add the new class.
+        if (this.passwordClass) {
+          passwordResult.removeClass(this.passwordClass);
+          passwordDescription.removeClass(this.passwordClass);
+        }
+        passwordResult.addClass(class);
+        passwordDescription.addClass(class);
+        this.passwordClass = class;
+
+        // Check that password and confirmation match.
+
+        // Hide the result layer if confirmation is empty, otherwise show the layer.
+        confirmResult.css({ visibility: (confirmInput.val() == "" ? "hidden" : "visible") });
+
+        var success = passwordInput.val() == confirmInput.val();
+
+        // Remove the previous styling if any exists.
+        if (this.confirmClass) {
+          confirmResult.removeClass(this.confirmClass);
+        }
+
+        // Display the correct message and set the class accordingly.
+         var class = success ? "ok" : "error";
+        confirmResult.html(translate["confirm"+ (success ? "Success" : "Failure")]).addClass(class);
+        this.confirmClass = class;
+      }, monitorDelay);
+    };
+    // Monitor keyup and blur events.
+    // Blur must be used because a mouse paste does not trigger keyup.
+    passwordInput.keyup(passwordMonitor).blur(passwordMonitor);
+    confirmInput.keyup(passwordMonitor).blur(passwordMonitor);
+  });
+}
+
+/**
+ * Evaluate the strength of a user's password.
+ *
+ * Returns the estimated strength and the relevant output message.
+ */
+Drupal.evaluatePasswordStrength = function(value) {
+  var strength = "", msg = "", translate = Drupal.settings.password;
+
+  // Check if the password is blank.
+  if (!value.length) {
+    strength = "";
+    msg = "";
+  }
+  // Check if length is less than 6 characters.
+  else if (value.length < 6) {
+    strength = "low";
+    msg = translate.tooShort;
+  }
+  // Check if password is the same as the username (convert both to lowercase).
+  else if (value.toLowerCase() == translate.username.toLowerCase()) {
+    strength  = "low";
+    msg = translate.sameAsUsername;
+  }
+  // Check if it only contains letters.
+  else if (value.match(/^[a-zA-Z]*$/)) {
+    strength = "medium";
+    msg = translate.onlyLetters;
+  }
+  // Check if it contains punctuation or other special characters.
+  else if (value.match(/^[a-zA-Z0-9]*$/)) {
+    strength = "medium";
+    msg = translate.addPunctuation;
+  }
+  else {
+    strength = "high";
+    msg = translate.goodPassword;
+  }
+  return { strength: strength, message: msg };
+}
+
+/**
  * On the admin/user/settings page, conditionally show all of the
  * picture-related form elements depending on the current value of the
  * "Picture support" radio buttons.
@@ -10,5 +136,6 @@ if (Drupal.jsEnabled) {
     $('div.user-admin-picture-radios input[@type=radio]').click(function () {
       $('div.user-admin-picture-settings')[['hide', 'show'][this.value]]();
     });
+    Drupal.passwordAttach();
   });
 }
Index: modules/user/user.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.module,v
retrieving revision 1.785
diff -u -p -r1.785 user.module
--- modules/user/user.module	22 May 2007 05:52:17 -0000	1.785
+++ modules/user/user.module	24 May 2007 10:22:41 -0000
@@ -1424,6 +1424,7 @@ function user_register_submit($form_valu
 }
 
 function user_edit_form($uid, $edit, $register = FALSE) {
+  _user_password_dynamic_validation();
   $admin = user_access('administer users');
 
   // Account information:
@@ -3161,3 +3162,35 @@ function _user_mail_notify($op, $account
   }
   return $result;
 }
+
+/**
+ * Add javascript and string translations for dynamic password validation (strength and confirmation checking).
+ *
+ * This is an internal function that makes it easier to manage the translation
+ * strings that need to be passed to the javascript code.
+ */
+function _user_password_dynamic_validation() {
+  static $complete = FALSE;
+  global $user;
+  // Only need to do once per page.
+  if (!$complete) {
+    drupal_add_js(drupal_get_path('module', 'user') .'/user.js', 'module');
+
+    drupal_add_js(array(
+      'password' => array(
+        'title' => t('Password strength:'),
+        'lowStrength' => t('Low'),
+        'mediumStrength' => t('Medium'),
+        'highStrength' => t('High'),
+        'tooShort' => t('Your password is recommended to be at least six characters in length for a minimum level of security.'),
+        'onlyLetters' => t('Your password currently only contains letters. Please add numbers and punctuation to strengthen it.'),
+        'addPunctuation' => t('To increase the strength of your password please add punctuation characters.'),
+        'sameAsUsername' => t('Your password should not be the same as your username.'),
+        'goodPassword' => t('Your password is complex enough to be reasonably secure.'),
+        'confirmSuccess' => t('Confirmation matches password.'),
+        'confirmFailure' => t('Password and confirmation do not match.'),
+        'username' => (isset($user->name) ? $user->name : ''))),
+      'setting');
+    $complete = TRUE;
+  }
+}