index.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Version information
 *
 * @package    tool
 * @subpackage mergeusers
 * @author     Nicolas Dunand <Nicolas.Dunand@unil.ch>
 * @author     Mike Holzer
 * @author     Forrest Gaston
 * @author     Juan Pablo Torres Herrera
 * @author     Jordi Pujol-Ahulló, Sred, Universitat Rovira i Virgili
 * @author     John Hoopes <hoopes@wisc.edu>, University of Wisconsin - Madison
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require('../../../config.php');

global $CFG;
global $SESSION;

// Report all PHP errors
error_reporting(E_ALL);
ini_set('display_errors', 'On');

require_once($CFG->libdir.'/blocklib.php');
require_once($CFG->libdir.'/adminlib.php');
require_once($CFG->libdir.'/accesslib.php');
require_once($CFG->libdir.'/weblib.php');

require_once('./index_form.php');
require_once(__DIR__ . '/lib/autoload.php');

require_login();
require_capability('moodle/site:config', context_system::instance());

admin_externalpage_setup('tool_mergeusers_merge');

// Get possible posted params
$option = optional_param('option', NULL, PARAM_TEXT);

// Define the form
$mergeuserform = new mergeuserform();
$renderer = $PAGE->get_renderer('tool_mergeusers');

$data = $mergeuserform->get_data();

$mut = new MergeUserTool(); //may abort execution if database not supported, for security
$mus = new MergeUserSearch(); // Search tool for searching for users and verifying them

if(!empty($option)){ // if there was a custom option submitted (by custom form) then use that option instead of main form's data

    switch($option){
        case 'saveselection':

            //get and verify the userids from the selection form usig the verify_user function (second field is column)
            list($olduser, $oumessage) = $mus->verify_user(optional_param('olduser', NULL, PARAM_INT), 'id');
            list($newuser, $numessage) = $mus->verify_user(optional_param('newuser', NULL, PARAM_INT), 'id');

            if($olduser === NULL && $newuser === NULL){
                $renderer->mu_error(get_string('no_saveselection', 'tool_mergeusers'));
                exit(); // end execution for error
            }

            if(empty($SESSION->mut)){
                $SESSION->mut = new stdClass();
            }

            // Store saved selection in session for display on index page, requires logic to not overwrite existing session
            //   data, unless a "new" old, or "new" new is specified

            // If session old user already has a user and we have a "new" old user, replace the sesson's old user
            if(empty($SESSION->mut->olduser) || !empty($olduser) ){
                $SESSION->mut->olduser = $olduser;
            }

            // If session new user already has a user and we have a "new" new user, replace the sesson's new user
            if(empty($SESSION->mut->newuser) || !empty($newuser) ){
                $SESSION->mut->newuser = $newuser;
            }

            // Redirect back to index/search page for new selections or review selections
            $redirecturl = new moodle_url('/admin/tool/mergeusers/index.php');
            redirect($redirecturl, NULL, 0);

            break;
        case 'clearselection':

            $SESSION->mut = NULL;

            // Redirect back to index/search page for new selections or review selections
            $redirecturl = new moodle_url('/admin/tool/mergeusers/index.php');
            redirect($redirecturl, NULL, 0);

            break;
        case 'mergeusers':

            // Verify users once more just to be sure.  Both users should already be verified, but just an extra layer of security
            list($fromuser, $oumessage) = $mus->verify_user($SESSION->mut->olduser->id, 'id');
            list($touser, $numessage) = $mus->verify_user($SESSION->mut->newuser->id, 'id');
            if($fromuser === NULL || $touser === NULL){
                $renderer->mu_error($oumessage . '<br />' . $numessage);
                break; // break execution for error
            }

            // Merge the users
            $log = array();
            $success = true;
            list($success, $log, $logid) = $mut->merge($touser->id, $fromuser->id);

            // reset mut session
            $SESSION->mut = NULL;

            // render results page
            echo $renderer->results_page($touser, $fromuser, $success, $log, $logid);

            break;
        default:

            $renderer->mu_error(get_string('invalid_option', 'tool_mergeusers'));

            break;
    }

}else if ($data) { // Any submitted data?

    // If there is a search argument use this instead of advanced form
    if(!empty($data->searchgroup['searcharg'])){

        $search_users = $mus->search_users($data->searchgroup['searcharg'], $data->searchgroup['searchfield']);
        $user_select_table = new UserSelectTable($search_users);

        echo $renderer->index_page($mergeuserform, $user_select_table);
    }else if(!empty($data->oldusergroup['olduserid']) && !empty($data->newusergroup['newuserid']) ){ // only run this step if there are both a new and old userids

        //get and verify the userids from the selection form usig the verify_user function (second field is column)
        list($olduser, $oumessage) = $mus->verify_user($data->oldusergroup['olduserid'], $data->oldusergroup['olduseridtype']);
        list($newuser, $numessage) = $mus->verify_user($data->newusergroup['newuserid'], $data->newusergroup['newuseridtype']);

        if($olduser === NULL || $newuser === NULL){
            $renderer->mu_error($oumessage . '<br />' . $numessage);
            exit(); // end execution for error
        }
        // Add users to session for review step
        if(empty($SESSION->mut)){
            $SESSION->mut = new stdClass();
        }
        $SESSION->mut->olduser = $olduser;
        $SESSION->mut->newuser = $newuser;

        echo $renderer->index_page($mergeuserform);
    }else{
        echo $renderer->index_page($mergeuserform);
    }

}  else {
    // no form submitted data
    echo $renderer->index_page($mergeuserform);
}