UserRecoveryForm.php

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<?php

class UserRecoveryForm extends CFormModel
{
    public $login_or_email, $user_id;

    public function rules()
    {
        return array(
            // username and password are required
            array('login_or_email', 'required'),
            array('login_or_email', 'match', 'pattern' => '/^[A-Za-z0-9@.-\s,]+$/u','message' => UserModule::t("Incorrect symbols (A-z0-9).")),
            // password needs to be authenticated
            array('login_or_email', 'checkexists'),
        );
    }
    public function attributeLabels()
    {
        return array(
            'login_or_email' => UserModule::t("username or email"),
        );
    }

    public function checkexists($attribute, $params)
    {
        if (!$this->hasErrors()) {
            // we only want to authenticate when no input errors

            if (strpos($this->login_or_email, "@")) {
                $user = User::model()->findByAttributes(array('email' => $this->login_or_email));
                if ($user) {
                    $this->user_id = $user->id;
                }
            } else {
                $user = User::model()->findByAttributes(array('username' => $this->login_or_email));
                if ($user) {
                    $this->user_id = $user->id;
                }
            }

            if ($user === null) {
                if (strpos($this->login_or_email, "@")) {
                    $this->addError("login_or_email", UserModule::t("Email is incorrect."));
                } else {
                    $this->addError("login_or_email", UserModule::t("Username is incorrect."));
                }
            }
        }
    }
}