Password expiration feature #102

It's still missing an enforcement which redirects all actions to profile
update until the password is changed

src/User/Model/User.php

@@ -19,6 +19,7 @@ use Yii;
 use yii\base\NotSupportedException;
 use yii\behaviors\TimestampBehavior;
 use yii\db\ActiveRecord;
+use yii\db\Expression;
 use yii\helpers\ArrayHelper;
 use yii\web\Application;
 use yii\web\IdentityInterface;
@@ -46,6 +47,8 @@ use yii\web\IdentityInterface;
  * @property int $created_at
  * @property int $updated_at
  * @property int $last_login_at
+ * @property int $last_password_change
+ * @property int $password_age
  *
  * Defined relations:
  * @property SocialNetworkAccount[] $socialNetworkAccounts
@@ -88,6 +91,7 @@ class User extends ActiveRecord implements IdentityInterface
                 'password_hash',
                 $security->generatePasswordHash($this->password, $this->getModule()->blowfishCost)
             );
+            $this->last_password_change = new Expression("NOW()");
         }
 
         return parent::beforeSave($insert);
@@ -138,6 +142,8 @@ class User extends ActiveRecord implements IdentityInterface
             'created_at' => Yii::t('usuario', 'Registration time'),
             'confirmed_at' => Yii::t('usuario', 'Confirmation time'),
             'last_login_at' => Yii::t('usuario', 'Last login'),
+            'last_password_change' => Yii::t('usuario', 'Last password change'),
+            'password_age' => Yii::t('usuario', 'Password age'),
         ];
     }
 
@@ -312,4 +318,17 @@ class User extends ActiveRecord implements IdentityInterface
     {
         throw new NotSupportedException('Method "' . __CLASS__ . '::' . __METHOD__ . '" is not implemented.');
     }
+    
+    /**
+     * Returns password age in days
+     * @return integer 
+     */
+    public function getPassword_age()
+    {
+        if (is_null($this->last_password_change)) {
+            return $this->getModule()->maxPasswordAge;
+        }
+        $d = new \DateTime($this->last_password_change);
+        return $d->diff(new \DateTime(), true)->format("%a");
+    }
 }