Auth.php

<?php

class Controller_Api_V0_Auth extends Controller_Handler_Api
{
    /**
     * @api {get} api/v0/auth/userinfo?token=:token&login=:login&password=:password Check authorisation and get user info
     * @apiName Get user info
     * @apiGroup Auth
     * @apiVersion 0.1.1
     * @apiParam {String} token Api key
     * @apiParam {String} login User's login
     * @apiParam {String} password User's password
     *
     * @apiSuccess (200) {String} LastName
     * @apiSuccess (200) {String} FirstName
     * @apiSuccess (200) {String} SecondName
     * @apiSuccess (200) {Boolean} IsEnabled
     * @apiSuccess (200) {String="teacher", "student"} Type
     * @apiSuccess (200) {String} TeacherID If user is a teacher
     * @apiSuccess (200) {String} StudentID If user is a student
     * @apiSuccess (200) {String} Grade If user is a student
     * @apiSuccess (200) {String} GradeID If user is a student
     * @apiSuccess (200) {String} Group If user is a student
     * @apiSuccess (200) {String} GroupID If user is a student
     */
    public function action_get_userinfo() {
        if ( !$this->user->isAdmin() ) // ToDo: we should use apikey mask for checking rights
            $this->fail();

        $login = $this->request->query('login');
        $password = $this->request->query('password');

        $id = (int) Model_Account::checkAuth($login, $password);
        if ($id < 0)
            $this->notFoundError('Login or password are incorrect.');

        $info = (object)Model_Account::with($id);

        $res = (object)['LastName' => $info->LastName,
            'FirstName' => $info->FirstName,
            'SecondName' => $info->SecondName,
            'IsEnabled' => $info->IsEnabled,
            'Type' => $info->Type];

        switch($info->Type )
        {
            case 'teacher':
                $res->TeacherID = $info->TeacherID;
                break;
            case 'student':
                $res->StudentID = $info->StudentID;
                $student = Model_Student::load($info->StudentID);
                $res->Grade = $student->GradeNum;
                $res->GradeID = $student->GradeID;
                $res->Group = $student->GroupNum;
                $res->GroupID = $student->GroupID;
                break;
        }

        return $res;
    }

}