NEW Give feedback of password strength

src/Forms/ConfirmedPasswordField.php

@@ -10,8 +10,13 @@ use SilverStripe\Security\Authenticator;
 use SilverStripe\Security\Security;
 use SilverStripe\View\HTML;
 use Closure;
+use SilverStripe\Control\HTTP;
 use SilverStripe\Core\Validation\ConstraintValidator;
 use Symfony\Component\Validator\Constraints\PasswordStrength;
+use SilverStripe\Forms\LiteralField;
+use SilverStripe\Control\HTTPRequest;
+use SilverStripe\Control\HTTPResponse;
+use SilverStripe\Security\Validation\PasswordValidator;
 
 /**
  * Two masked input fields, checks for matching passwords.
@@ -24,6 +29,9 @@ use Symfony\Component\Validator\Constraints\PasswordStrength;
  */
 class ConfirmedPasswordField extends FormField
 {
+    private static $allowed_actions = [
+        'strength',
+    ];
 
     /**
      * Minimum character length of the password.
@@ -106,6 +114,8 @@ class ConfirmedPasswordField extends FormField
 
     protected ?PasswordField $passwordField;
 
+    protected ?LiteralField $passwordStrengthField;
+
     protected ?PasswordField $confirmPasswordfield;
 
     protected ?HiddenField $hiddenField = null;
@@ -132,6 +142,10 @@ class ConfirmedPasswordField extends FormField
                 "{$name}[_Password]",
                 $title
             ),
+            $this->passwordStrengthField = LiteralField::create(
+                "{$name}[_PasswordStrength]",
+                '<div class="passwordstrength"></div>'
+            ),
             $this->confirmPasswordfield = PasswordField::create(
                 "{$name}[_ConfirmPassword]",
                 (isset($titleConfirmField)) ? $titleConfirmField : _t('SilverStripe\\Security\\Member.CONFIRMPASSWORD', 'Confirm Password')
@@ -154,6 +168,50 @@ class ConfirmedPasswordField extends FormField
         $this->setValue($value);
     }
 
+    /**
+     * Provides feedback for the current and required level of password strength
+     */
+    public function strength(HTTPRequest $request): HTTPResponse
+    {
+        $response = HTTPResponse::create();
+        $json = json_decode($request->getBody(), true);
+        if (!$json || !array_key_exists('password', $json) || !$request->isPOST()) {
+            $response->setStatusCode(400);
+            return $response;
+        }
+        $password = $json['password'];
+        $validator = PasswordValidator::create();
+        if ($this->getRequireStrongPassword()) {
+            $requiredStrength = $this->getMinPasswordStrength();
+        } else {
+            $requiredStrength = $validator->getRequiredStrength();
+        }
+        $requiredLevel = $validator->getStrengthLevel($requiredStrength);
+        $passwordStrength = $validator->evaluateStrength($password);
+        $passwordLevel = $validator->getStrengthLevel($passwordStrength);
+        if ($passwordStrength < $requiredStrength) {
+            $valid = false;
+            $message = _t(
+                __CLASS__ . '.STRENGTH',
+                'Password strength is {passwordLevel}, must be at least {requiredLevel}',
+                ['passwordLevel' => $passwordLevel, 'requiredLevel' => $requiredLevel]
+            );
+        } else {
+            $valid = true;
+            $message = _t(
+                __CLASS__ . '.STRENGTH',
+                'Password strength is {passwordLevel}',
+                ['passwordLevel' => $passwordLevel]
+            );
+        }
+        $body = json_encode((object) [
+            'valid' => $valid,
+            'message' => $message,
+        ]);
+        $response->setBody($body);
+        return $response;
+    }
+
     public function Title()
     {
         // Title is displayed on nested field, not on the top level field
@@ -173,6 +231,7 @@ class ConfirmedPasswordField extends FormField
      */
     public function Field($properties = [])
     {
+        $canEvaluateStrength = PasswordValidator::singleton()->canEvaluateStrength();
         // Build inner content
         $fieldContent = '';
         foreach ($this->getChildren() as $field) {
@@ -184,6 +243,9 @@ class ConfirmedPasswordField extends FormField
                     $field->setAttribute($name, $value);
                 }
             }
+            if ($canEvaluateStrength && is_a($field, PasswordField::class)) {
+                $field->setAttribute('data-strengthurl', $this->Link('strength'));
+            }
 
             $fieldContent .= $field->FieldHolder(['AttributesHTML' => $this->getAttributesHTMLForChild($field)]);
         }

src/Forms/PasswordField.php

@@ -2,6 +2,12 @@
 
 namespace SilverStripe\Forms;
 
+use SilverStripe\Control\Director;
+use SilverStripe\Security\Security;
+use SilverStripe\Security\Validation\PasswordValidator;
+use SilverStripe\Control\HTTPRequest;
+use SilverStripe\Control\HTTPResponse;
+
 /**
  * Password input field.
  */

src/Security/Validation/EntropyPasswordValidator.php

@@ -20,7 +20,7 @@ class EntropyPasswordValidator extends PasswordValidator
      * The strength of a valid password.
      * See https://symfony.com/doc/current/reference/constraints/PasswordStrength.html#minscore
      */
-    private static int $password_strength = PasswordStrength::STRENGTH_STRONG;
+    private static int $password_strength = PasswordStrength::STRENGTH_MEDIUM;
 
     public function validate(string $password, Member $member): ValidationResult
     {
@@ -30,4 +30,35 @@ class EntropyPasswordValidator extends PasswordValidator
         $this->extend('updateValidatePassword', $password, $member, $result, $this);
         return $result;
     }
+
+    public function getRequiredStrength(): int
+    {
+        return static::config()->get('password_strength');
+    }
+    
+    public function canEvaluateStrength(): bool
+    {
+        return true;
+    }
+
+    public function evaluateStrength(string $password): int
+    {
+        $strengths = [
+            PasswordStrength::STRENGTH_WEAK,
+            PasswordStrength::STRENGTH_MEDIUM,
+            PasswordStrength::STRENGTH_STRONG,
+            PasswordStrength::STRENGTH_VERY_STRONG,
+        ];
+        // STRENGTH_VERY_WEAK is not validatable, it's just the default value
+        $lastPassedStrength = PasswordStrength::STRENGTH_VERY_WEAK;
+        foreach ($strengths as $strength) {
+            $result = ConstraintValidator::validate($password, new PasswordStrength(minScore: $strength));
+            if ($result->isValid()) {
+                $lastPassedStrength = $strength;
+            } else {
+                break;
+            }
+        }
+        return $lastPassedStrength;
+    }
 }

src/Security/Validation/PasswordValidator.php

@@ -8,6 +8,7 @@ use SilverStripe\ORM\DataObject;
 use SilverStripe\Core\Validation\ValidationResult;
 use SilverStripe\Security\Member;
 use SilverStripe\Security\MemberPassword;
+use Symfony\Component\Validator\Constraints\PasswordStrength;
 
 /**
  * Abstract validator with functionality for checking for reusing old passwords.
@@ -69,4 +70,63 @@ abstract class PasswordValidator
         $this->historicalPasswordCount = $count;
         return $this;
     }
+
+    /**
+     * Get the required strength of a password based on the consts in
+     * Symfony\Component\Validator\Constraints\PasswordStrength
+     * Default return -1 for validators that do not support this
+     *
+     */
+    public function getRequiredStrength(): int
+    {
+        return -1;
+    }
+
+    /**
+     * Check if this validator can evaluate password strength.
+     */
+    public function canEvaluateStrength(): bool
+    {
+        return false;
+    }
+
+    /**
+     * Evaluate the strength of a password based on the consts in
+     * Symfony\Component\Validator\Constraints\PasswordStrength
+     * Default return -1 for validators that do not support this
+     */
+    public function evaluateStrength(string $password): int
+    {
+        return -1;
+    }
+
+    /**
+     * Textual representation of an evaluated password strength
+     */
+    public static function getStrengthLevel(int $strength): string
+    {
+        return match ($strength) {
+            PasswordStrength::STRENGTH_VERY_WEAK => _t(
+                PasswordValidator::class . '.VERYWEAK',
+                'very weak'
+            ),
+            PasswordStrength::STRENGTH_WEAK => _t(
+                PasswordValidator::class . '.WEAK',
+                'weak'
+            ),
+            PasswordStrength::STRENGTH_MEDIUM => _t(
+                PasswordValidator::class . '.MEDIUM',
+                'medium'
+            ),
+            PasswordStrength::STRENGTH_STRONG => _t(
+                PasswordValidator::class . '.STRONG',
+                'strong'
+            ),
+            PasswordStrength::STRENGTH_VERY_STRONG => _t(
+                PasswordValidator::class . '.VERYSTRONG',
+                'very strong'
+            ),
+            default => '',
+        };
+    }
 }