/main/document/save_pixlr.php

<?php
/* For licensing terms, see /license.txt */
/**
 *    This file allows creating new svg and png documents with an online editor.
 *
 * @package chamilo.document
 *
 * @author Juan Carlos Raña Trabado
 * @since 30/january/2011
 */
/**
 * Code
 */
require_once '../inc/global.inc.php';

api_protect_course_script();
api_block_anonymous_users();

if ($_user['user_id'] != api_get_user_id() || api_get_user_id() == 0 || $_user['user_id'] == 0) {
    api_not_allowed();
    die();
}

if (!isset($_GET['title']) || !isset($_GET['type']) || !isset($_GET['image'])) {
    api_not_allowed();
    die();
}

if (!isset($_SESSION['paint_dir']) || !isset($_SESSION['whereami'])) {
    api_not_allowed();
    die();
}

//pixlr return

$filename = Security::remove_XSS($_GET['title']); //The user preferred file name of the image.
$extension = Security::remove_XSS($_GET['type']); //The image type, "pdx", "jpg", "bmp" or "png".
$urlcontents = Security::remove_XSS(
    $_GET['image']
); //A URL to the image on Pixlr.com server or the raw file post of the saved image.

//make variables

$title = Database::escape_string(str_replace('_', ' ', $filename));
$current_session_id = api_get_session_id();
$groupId = api_get_group_id();
$relativeUrlPath = $_SESSION['paint_dir'];
$currentTool = $_SESSION['whereami'];
$dirBaseDocuments = api_get_path(SYS_COURSE_PATH).$_course['path'].'/document';
$saveDir = $dirBaseDocuments.$_SESSION['paint_dir'];

$contents = file_get_contents($urlcontents);

//Security. Verify that the URL is pointing to a file @ pixlr.com domain or an ip @ pixlr.com. Comment because sometimes return a ip number
/*
if (strpos($urlcontents, "pixlr.com") === 0){
	echo "Invalid referrer";
	exit;
}
*/

//Security. Allway get from pixlr.com. Comment because for now this does not run
/*
$urlcontents1='http://pixlr.com/';
$urlcontents2 = strstr($urlcontents, '_temp');
$urlcontents_to_save=$urlcontents1.$urlcontents2;
$contents = file_get_contents($urlcontents_to_save);//replace line 45.
*/

//a bit title security
$filename = addslashes(trim($filename));
$filename = Security::remove_XSS($filename);
$filename = replace_dangerous_char($filename, 'strict');
$filename = FileManager::disable_dangerous_file($filename);

if (strlen(trim($filename)) == 0) {
    echo "The title is empty"; //if title is empty, headers Content-Type = application/octet-stream, then not create a new title here please
    exit;
}

//check file_get_contents
if ($contents === false) {
    echo "I cannot read: ".$urlcontents;
    exit;
}

// Extension security
if ($extension != 'jpg' && $extension != 'png' && $extension != 'pxd') {
    die();
}
if ($extension == 'pxd') {
    echo "pxd file type does not supported"; // not secure because check security headers and finfo() return  Content-Type = application/octet-stream
    exit;
}

//Verify that the file is an image. Headers method
$headers = get_headers($urlcontents, 1);
$content_type = explode("/", $headers['Content-Type']);
if ($content_type[0] != "image") {
    echo "Invalid file type";
    exit;
}

//Verify that the file is an image. Fileinfo method
$finfo = new finfo(FILEINFO_MIME);
$current_mime = $finfo->buffer($contents);
finfo_close($finfo);
if (strpos($current_mime, 'image') === false) {
    echo "Invalid mime type file";
    exit;
}


//make a temporal file for get the file size
$tmpfname = tempnam("/tmp", "CTF");
$handle = fopen($tmpfname, "w");
fwrite($handle, $contents);
fclose($handle);

// Check if there is enough space in the course to save the file
if (!DocumentManager::enough_space(filesize($tmpfname), DocumentManager::get_course_quota())) {
    unlink($tmpfname);
    die(get_lang('UplNotEnoughSpace'));
}

//erase temporal file
unlink($tmpfname);


//path, file and title
$paintFileName = $filename.'.'.$extension;
$title = $title.'.'.$extension;

if ($currentTool == 'document/createpaint') {
    //check save as and prevent rewrite an older file with same name
    if (0 != $groupId) {
        $group_properties = GroupManager :: get_group_properties($groupId);
        $groupPath = $group_properties['directory'];
    } else {
        $groupPath = '';
    }

    if (file_exists($saveDir.'/'.$filename.'.'.$extension)) {
        $i = 1;
        while (file_exists($saveDir.'/'.$filename.'_'.$i.'.'.$extension)) {
            $i++;
        }
        $paintFileName = $filename.'_'.$i.'.'.$extension;
        $title = $filename.'_'.$i.'.'.$extension;
    }

    //
    $documentPath = $saveDir.'/'.$paintFileName;
    //add new document to disk
    file_put_contents($documentPath, $contents);
    //add document to database
    $doc_id = FileManager::add_document(
        $_course,
        $relativeUrlPath.'/'.$paintFileName,
        'file',
        filesize($documentPath),
        $title
    );
    api_item_property_update(
        $_course,
        TOOL_DOCUMENT,
        $doc_id,
        'DocumentAdded',
        $_user['user_id'],
        $groupId,
        null,
        null,
        null,
        $current_session_id
    );

} elseif ($currentTool == 'document/editpaint') {

    $documentPath = $saveDir.'/'.$paintFileName;
    //add new document to disk
    file_put_contents($documentPath, $contents);

    //check path
    if (!isset($_SESSION['paint_file'])) {
        api_not_allowed();
        die();
    }
    if ($_SESSION['paint_file'] == $paintFileName) {
        $document_id = DocumentManager::get_document_id($_course, $relativeUrlPath.'/'.$paintFileName);
        FileManager::update_existing_document($_course, $document_id, filesize($documentPath), null);
        api_item_property_update(
            $_course,
            TOOL_DOCUMENT,
            $document_id,
            'DocumentUpdated',
            $_user['user_id'],
            $groupId,
            null,
            null,
            null,
            $current_session_id
        );
    } else {
        //add a new document
        $doc_id = FileManager::add_document(
            $_course,
            $relativeUrlPath.'/'.$paintFileName,
            'file',
            filesize($documentPath),
            $title
        );
        api_item_property_update(
            $_course,
            TOOL_DOCUMENT,
            $doc_id,
            'DocumentAdded',
            $_user['user_id'],
            $groupId,
            null,
            null,
            null,
            $current_session_id
        );
    }
}


//delete temporal file
$temp_file_2delete = $_SESSION['temp_realpath_image'];
unlink($temp_file_2delete);

//Clean sessions and return to Chamilo file list
unset($_SESSION['paint_dir']);
unset($_SESSION['paint_file']);
unset($_SESSION['whereami']);
unset($_SESSION['temp_realpath_image']);

if (!isset($_SESSION['exit_pixlr'])) {
    $location = api_get_path(WEB_CODE_PATH).'document/document.php';
    echo '<script>window.parent.location.href="'.$location.'"</script>';
    api_not_allowed(true);
} else {
    echo '<div align="center" style="padding-top:150; font-family:Arial, Helvetica, Sans-serif;font-size:25px;color:#aaa;font-weight:bold;">'.get_lang(
        'PleaseStandBy'
    ).'</div>';
    $location = api_get_path(WEB_CODE_PATH).'document/document.php?id='.Security::remove_XSS($_SESSION['exit_pixlr']);
    echo '<script>window.parent.location.href="'.$location.'"</script>';
    unset($_SESSION['exit_pixlr']);
}