yii composer install

models/LoginForm.php

@@ -0,0 +1,81 @@
+<?php
+
+namespace app\models;
+
+use Yii;
+use yii\base\Model;
+
+/**
+ * LoginForm is the model behind the login form.
+ *
+ * @property User|null $user This property is read-only.
+ *
+ */
+class LoginForm extends Model
+{
+    public $username;
+    public $password;
+    public $rememberMe = true;
+
+    private $_user = false;
+
+
+    /**
+     * @return array the validation rules.
+     */
+    public function rules()
+    {
+        return [
+            // username and password are both required
+            [['username', 'password'], 'required'],
+            // rememberMe must be a boolean value
+            ['rememberMe', 'boolean'],
+            // password is validated by validatePassword()
+            ['password', 'validatePassword'],
+        ];
+    }
+
+    /**
+     * Validates the password.
+     * This method serves as the inline validation for password.
+     *
+     * @param string $attribute the attribute currently being validated
+     * @param array $params the additional name-value pairs given in the rule
+     */
+    public function validatePassword($attribute, $params)
+    {
+        if (!$this->hasErrors()) {
+            $user = $this->getUser();
+
+            if (!$user || !$user->validatePassword($this->password)) {
+                $this->addError($attribute, 'Incorrect username or password.');
+            }
+        }
+    }
+
+    /**
+     * Logs in a user using the provided username and password.
+     * @return boolean whether the user is logged in successfully
+     */
+    public function login()
+    {
+        if ($this->validate()) {
+            return Yii::$app->user->login($this->getUser(), $this->rememberMe ? 3600*24*30 : 0);
+        }
+        return false;
+    }
+
+    /**
+     * Finds user by [[username]]
+     *
+     * @return User|null
+     */
+    public function getUser()
+    {
+        if ($this->_user === false) {
+            $this->_user = User::findByUsername($this->username);
+        }
+
+        return $this->_user;
+    }
+}