moodle/backup/restore_precheck.html

<?php  // $Id$
    //This page copies th zip to the temp directory,
    //unzip it, check that it is a valid backup file
    //inform about its contents and fill all the necesary
    //variables to continue with the restore.

    //Checks we have the file variable
    if (!isset($file)) {         
        error ("File not specified");
    }

    //Check login   
    require_login();
 
    //Check admin
    if (!empty($id)) {
        if (!isteacheredit($id)) {
            error("You need to be a teacher or admin user to use this page.", "$CFG->wwwroot/login/index.php");
        }
    } else {
        if (!isadmin()) {
            error("You need to be an admin user to use this page.", "$CFG->wwwroot/login/index.php");   
        }
    }

    //Check site
    if (!$site = get_site()) {
        error("Site not found!");
    }

    //Prepend dataroot to variable to have the absolute path
    $file = $CFG->dataroot."/".$file;

    //Start the main table
    echo "<table cellpadding=\"5\">";
    echo "<tr><td>";
    
    //Start the mail ul
    echo "<ul>";

    //Check the file exists 
    if (!is_file($file)) {
        error ("File not exists ($file)");
    }

    //Check the file name ends with .zip
    if (!substr($file,-4) == ".zip") {
        error ("File has an incorrect extension");
    }

    //Now calculate the unique_code for this restore
    $backup_unique_code = time();
    
    //Now check and create the backup dir (if it doesn't exist)
    echo "<li>".get_string("creatingtemporarystructures");
    $status = check_and_create_backup_dir($backup_unique_code);
    //Empty dir
    if ($status) {
        $status = clear_backup_dir($backup_unique_code);
    }

    //Now delete old data and directories under dataroot/temp/backup
    if ($status) {   
        echo "<li>".get_string("deletingolddata");
        $status = backup_delete_old_data();
    }
  
    //Now copy he zip file to dataroot/temp/backup/backup_unique_code
    if ($status) {
        echo "<li>".get_string("copyingzipfile");
        if (! $status = backup_copy_file($file,$CFG->dataroot."/temp/backup/".$backup_unique_code."/".basename($file))) {
            notify("Error copying backup file. Invalid name or bad perms.");
        }
    }

    //Now unzip the file
    if ($status) {
        echo "<li>".get_string("unzippingbackup");
        if (! $status = restore_unzip ($CFG->dataroot."/temp/backup/".$backup_unique_code."/".basename($file))) {
            notify("Error unzipping backup file. Invalid zip file.");
        }
    }

    //Now check for the moodle.xml file
    if ($status) {
        $xml_file  = $CFG->dataroot."/temp/backup/".$backup_unique_code."/moodle.xml";
        echo "<li>".get_string("checkingbackup");
        if (! $status = restore_check_moodle_file ($xml_file)) {
            notify("Error checking backup file. Invalid or corrupted.");
        }
    }

    $info = "";
    $course_header = "";

    //Now read the info tag (all)
    if ($status) {
        echo "<li>".get_string("readinginfofrombackup");
        //Reading info from file
        $info = restore_read_xml_info ($xml_file);
        //Reading course_header from file
        $course_header = restore_read_xml_course_header ($xml_file);
    }

    //End the main ul
    echo "</ul>";

    //End the main table
    echo "</tr></td>";
    echo "</table>";

    //We compare Moodle's versions
    if ($CFG->version < $info->backup_moodle_version && $status) {
        $message->serverversion = $CFG->version;
        $message->serverrelease = $CFG->release;
        $message->backupversion = $info->backup_moodle_version;
        $message->backuprelease = $info->backup_moodle_release;
        print_simple_box(get_string('noticenewerbackup','',$message), "center", "70%", "$THEME->cellheading2", "20", "noticebox");

    }

    //Now we print in other table, the backup and the course it contains info
    if ($info and $course_header and $status) {
        //First, the course info
        $status = restore_print_course_header($course_header);
        //Now, the backup info
        if ($status) {
            $status = restore_print_info($info);
        }
    }

    //Save course header and info into php session
    if ($status) {
        $SESSION->info = $info;
        $SESSION->course_header = $course_header;
    }

    //Finally, a little form to continue
    //with some hidden fields
    if ($status) {
        echo "<br /><center>";
        $hidden["backup_unique_code"] = $backup_unique_code;
        $hidden["launch"]             = "form";
        $hidden["file"]               =  $file;
        $hidden["id"]                 =  $id;
        print_single_button("restore.php", $hidden, get_string("continue"),"post");
        echo "</center>";
    }
  
    if (!$status) {
        error ("An error has ocurred");
    }

?>