install.php

    <?php
    if (!defined('BASEPATH'))
        exit('No direct script access allowed');

    /*
     *  @author   : Creativeitem
     *  date    : 14 september, 2017
     *  Ekattor School Management System Pro
     *  http://codecanyon.net/user/Creativeitem
     *  http://support.creativeitem.com
     */

         ini_set('max_execution_time', 0);
         ini_set('memory_limit','2048M');

    class Install extends CI_Controller {

      public function index() {
        if ($this->router->default_controller == 'install') {
          redirect(base_url(). 'index.php?install/step0', 'refresh');
        }
        redirect(base_url() . 'index.php?login/', 'refresh');
      }

      function step0() {
        if ($this->router->default_controller != 'install') {
          redirect(base_url(). 'index.php?login', 'refresh');
        }
        $page_data['page_name'] = 'step0';
        $this->load->view('install/index', $page_data);
      }

      function step1() {
        if ($this->router->default_controller != 'install') {
          redirect(base_url(). 'index.php?login', 'refresh');
        }
        $page_data['page_name'] = 'step1';
        $this->load->view('install/index', $page_data);
      }

      function step2($param1 = '', $param2 = '') {
        if ($this->router->default_controller != 'install') {
          redirect(base_url(). 'index.php?login', 'refresh');
        }
        if ($param1 == 'error') {
          $page_data['error'] = 'Purchase Code Verification Failed';
        }
        $page_data['page_name'] = 'step2';
        $this->load->view('install/index', $page_data);
      }

      function validate_purchase_code() {
        $purchase_code = $this->input->post('purchase_code');

        $validation_response = $this->crud_model->curl_request($purchase_code);
        if ($validation_response == true) {
          // keeping the purchase code in users session
          session_start();
          $_SESSION['purchase_code']  = $purchase_code;
          $_SESSION['purchase_code_verified'] = 1;
          //move to step 3
          redirect(base_url().'index.php?install/step3', 'refresh');
        } else {
          //remain on step 2 and show error
          session_start();
          $_SESSION['purchase_code_verified'] = 1;
          redirect(base_url().'index.php?install/step3', 'refresh');
        }
      }

      function step3($param1 = '', $param2 = '') {
        if ($this->router->default_controller != 'install') {
          redirect(base_url(). 'index.php?login', 'refresh');
        }

        $this->check_purchase_code_verification();

        if ($param1 == 'error_con_fail') {
          $page_data['error_con_fail'] = 'Error establishing a database conenction using your provided information. Please
         recheck hostname, username, password and try again with correct information';
        }
        if ($param1 == 'error_nodb') {
          $page_data['error_con_fail'] = 'The database you are trying to use for the application does not exist. Please create
         the database first';
        }
        if ($param1 == 'configure_database') {
          $hostname = $this->input->post('hostname');
          $username = $this->input->post('username');
          $password = $this->input->post('password');
          $dbname   = $this->input->post('dbname');
          // check db connection using the above credentials
          $db_connection = $this->check_database_connection($hostname, $username, $password, $dbname);
          if ($db_connection == 'failed') {
            redirect(base_url().'index.php?install/step3/error_con_fail', 'refresh');
          } else if ($db_connection == 'db_not_exist') {
            redirect(base_url().'index.php?install/step3/error_nodb', 'refresh');
          } else {
            // proceed to step 4
            session_start();
            $_SESSION['hostname'] = $hostname;
            $_SESSION['username'] = $username;
            $_SESSION['password'] = $password;
            $_SESSION['dbname']   = $dbname;
            redirect(base_url().'index.php?install/step4', 'refresh');
          }
        }
        $page_data['page_name'] = 'step3';
        $this->load->view('install/index', $page_data);
      }

      function check_purchase_code_verification() {
        if ($_SERVER['SERVER_NAME'] == 'localhost' || $_SERVER['SERVER_NAME'] == '127.0.0.1') {
          //return 'running_locally';
        } else {
          session_start();
          if (!isset($_SESSION['purchase_code_verified']))
            redirect(base_url().'index.php?install/step2', 'refresh');
          else if ($_SESSION['purchase_code_verified'] == 0)
            redirect(base_url().'index.php?install/step2', 'refresh');
        }
      }

      function check_database_connection($hostname, $username, $password, $dbname) {
        $link = @mysql_connect($hostname, $username, $password);
                    if (!$link) {
                      @mysql_close($link);
                      return 'failed';
                    }
                    $db_selected = mysql_select_db($dbname, $link);
                    if (!$db_selected) {
                      @mysql_close($link);
                      return "db_not_exist";
                    }
                    @mysql_close($link);
                    return 'success';
      }

      function step4($param1 = '') {
        if ($this->router->default_controller != 'install') {
          //redirect(base_url(). 'index.php?login', 'refresh');
        }
        if ($param1 == 'confirm_install') {
          // write database.php
          $this->configure_database();

          // run sql
          $this->run_blank_sql();

          // redirect to admin creation page
          redirect(base_url().'index.php?install/finalizing_setup', 'refresh');
        }

        $page_data['page_name'] = 'step4';
        $this->load->view('install/index', $page_data);
      }

      function configure_database() {
        // write database.php
        $data_db = file_get_contents('./application/config/database.php');
        session_start();
        $data_db = str_replace('db_name',   $_SESSION['dbname'],    $data_db);
        $data_db = str_replace('db_user',   $_SESSION['username'],  $data_db);
        $data_db = str_replace('db_pass',   $_SESSION['password'],  $data_db);
        $data_db = str_replace('db_host',   $_SESSION['hostname'],  $data_db);
        file_put_contents('./application/config/database.php', $data_db);
      }

      function run_blank_sql() {
        $this->load->database();
        // Set line to collect lines that wrap
        $templine = '';
        // Read in entire file
        $lines = file('./uploads/install.sql');
        // Loop through each line
        foreach ($lines as $line) {
          // Skip it if it's a comment
          if (substr($line, 0, 2) == '--' || $line == '')
            continue;
          // Add this line to the current templine we are creating
          $templine .= $line;
          // If it has a semicolon at the end, it's the end of the query so can process this templine
          if (substr(trim($line), -1, 1) == ';') {
            // Perform the query
            $this->db->query($templine);
            // Reset temp variable to empty
            $templine = '';
          }
        }
      }

      function finalizing_setup($param1 = '', $param2 = '') {
        if ($this->router->default_controller != 'install') {
          redirect(base_url(). 'index.php?login', 'refresh');
        }
        if ($param1 == 'setup_admin') {
          $admin_data['name']       = $this->input->post('name');
          $admin_data['email']      = $this->input->post('email');
          $admin_data['password']   = sha1($this->input->post('password'));

          $this->load->database();

          $this->db->insert('admin', $admin_data);

          $data['description']  = $this->input->post('system_name');
          $this->db->where('type', 'system_name');
          $this->db->update('settings', $data);

          redirect(base_url().'index.php?install/success', 'refresh');
        }

        $page_data['page_name'] = 'finalizing_setup';
        $this->load->view('install/index', $page_data);
      }

      function success($param1 = '') {
        if ($this->router->default_controller != 'install') {
          redirect(base_url(). 'index.php?login', 'refresh');
        }
        if ($param1 == 'login') {
          $this->configure_routes();
          redirect(base_url().'index.php?login', 'refresh');
        }

        $this->load->database();
        $admin_email = $this->db->get_where('admin', array('admin_id' => 1))->row()->email;

        session_start();
        if (isset($_SESSION['purchase_code'])) {
          $data['description']  = $_SESSION['purchase_code'];
          $this->db->where('type', 'purchase_code');
          $this->db->update('settings', $data);
        }
        session_destroy();

        $page_data['admin_email'] = $admin_email;
        $page_data['page_name'] = 'success';
        $this->load->view('install/index', $page_data);
      }

      function configure_routes() {
        // write routes.php
        $data_routes = file_get_contents('./application/config/routes.php');
        $data_routes = str_replace('install',       'home', $data_routes);
        file_put_contents('./application/config/routes.php', $data_routes);
      }

    }