<?php
/* For licensing terms, see /license.txt */

/**
 * FILE UPLOAD LIBRARY
 *
 * This is the file upload library for Chamilo.
 * Include/require it in your code to use its functionality.
 *
 * @package chamilo.library
 * @todo test and reorganise
 */

/**
 * Changes the file name extension from .php to .phps
 * Useful for securing a site.
 *
 * @author Hugues Peeters <peeters@ipm.ucl.ac.be>
 * @param string $file_name Name of a file
 * @return string the filename phps'ized
 */
function php2phps($file_name)
{
    return preg_replace('/\.(php.?|phtml.?)(\.){0,1}.*$/i', '.phps', $file_name);
}

/**
 * Renames .htaccess & .HTACCESS to htaccess.txt
 *
 * @param string $filename
 * @return string
 */
function htaccess2txt($filename)
{
    return str_replace(array('.htaccess', '.HTACCESS'), array('htaccess.txt', 'htaccess.txt'), $filename);
}

/**
 * This function executes our safety precautions
 * more functions can be added
 *
 * @param string $filename
 * @return string
 * @see php2phps()
 * @see htaccess2txt()
 */
function disable_dangerous_file($filename)
{
    return htaccess2txt(php2phps($filename));
}

/**
 * Returns the name without extension, used for the title
 *
 * @param string $name
 * @return name without the extension
 */
function get_document_title($name)
{
    // If they upload .htaccess...
    $name = disable_dangerous_file($name);
    $ext = substr(strrchr($name, '.'), 0);
    return substr($name, 0, strlen($name) - strlen(strstr($name, $ext)));
}

/**
 * This function checks if the upload succeeded
 *
 * @param array $uploaded_file ($_FILES)
 * @return true if upload succeeded
 */
function process_uploaded_file($uploaded_file, $show_output = true)
{
    // Checking the error code sent with the file upload.
    if (isset($uploaded_file['error'])) {
        switch ($uploaded_file['error']) {
            case 1:
                // The uploaded file exceeds the upload_max_filesize directive in php.ini.
                if ($show_output) {
                    Display::addFlash(
                        Display::return_message(
                            get_lang('UplExceedMaxServerUpload').ini_get('upload_max_filesize'),
                            'error'
                        )
                    );
                }

                return false;
            case 2:
                // The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.
                // Not used at the moment, but could be handy if we want to limit the size of an upload
                // (e.g. image upload in html editor).
                $max_file_size = intval($_POST['MAX_FILE_SIZE']);
                if ($show_output) {
                    Display::addFlash(
                        Display::return_message(
                            get_lang('UplExceedMaxPostSize').format_file_size($max_file_size),
                            'error'
                        )
                    );
                }

                return false;
            case 3:
                // The uploaded file was only partially uploaded.
                if ($show_output) {
                    Display::addFlash(
                        Display::return_message(
                            get_lang('UplPartialUpload').' '.get_lang('PleaseTryAgain'),
                            'error'
                        )
                    );
                }

                return false;
            case 4:
                // No file was uploaded.
                if ($show_output) {
                    Display::addFlash(
                        Display::return_message(
                            get_lang('UplNoFileUploaded').' '.get_lang('UplSelectFileFirst'),
                            'error'
                        )
                    );
                }

                return false;
        }
    }

    if (!file_exists($uploaded_file['tmp_name'])) {
        // No file was uploaded.
        if ($show_output) {
            Display::addFlash(Display::return_message(get_lang('UplUploadFailed'), 'error'));
        }
        return false;
    }

    if (file_exists($uploaded_file['tmp_name'])) {
        $filesize = filesize($uploaded_file['tmp_name']);
        if (empty($filesize)) {
            // No file was uploaded.
            if ($show_output) {
                Display::addFlash(
                    Display::return_message(
                        get_lang('UplUploadFailedSizeIsZero'),
                        'error'
                    )
                );
            }

            return false;
        }
    }

    $course_id = api_get_course_id();

    //Checking course quota if we are in a course
    if (!empty($course_id)) {
        $max_filled_space = DocumentManager::get_course_quota();
        // Check if there is enough space to save the file
        if (!DocumentManager::enough_space($uploaded_file['size'], $max_filled_space)) {
            if ($show_output) {
                Display::addFlash(
                    Display::return_message(
                        get_lang('UplNotEnoughSpace'),
                        'error'
                    )
                );
            }

            return false;
        }
    }

    // case 0: default: We assume there is no error, the file uploaded with success.
    return true;
}

/**
 * This function does the save-work for the documents.
 * It handles the uploaded file and adds the properties to the database
 * If unzip=1 and the file is a zipfile, it is extracted
 * If we decide to save ALL kinds of documents in one database,
 * we could extend this with a $type='document', 'scormdocument',...
 *
 * @param array $courseInfo
 * @param array $uploadedFile ($_FILES)
 * array(
 *  'name' => 'picture.jpg',
 *  'tmp_name' => '...', // absolute path
 * );
 * @param string $documentDir Example: /var/www/chamilo/courses/ABC/document
 * @param string $uploadPath Example: /folder1/folder2/
 * @param int $userId
 * @param int $groupId group.id
 * @param int $toUserId, NULL for everybody
 * @param int $unzip 1/0
 * @param string $whatIfFileExists overwrite, rename or warn if exists (default)
 * @param boolean $output Optional output parameter.
 * @param bool $onlyUploadFile
 * @param string $comment
 * @param int $sessionId
 * @param bool $treat_spaces_as_hyphens
 *
 * So far only use for unzip_uploaded_document function.
 * If no output wanted on success, set to false.
 * @param string $comment
 * @return string path of the saved file
 */
function handle_uploaded_document(
    $courseInfo,
    $uploadedFile,
    $documentDir,
    $uploadPath,
    $userId,
    $groupId = 0,
    $toUserId = null,
    $unzip = 0,
    $whatIfFileExists = '',
    $output = true,
    $onlyUploadFile = false,
    $comment = null,
    $sessionId = null,
    $treat_spaces_as_hyphens = true
) {
    if (!$userId) {
        return false;
    }

    $userInfo = api_get_user_info();
    $uploadedFile['name'] = stripslashes($uploadedFile['name']);
    // Add extension to files without one (if possible)
    $uploadedFile['name'] = add_ext_on_mime($uploadedFile['name'], $uploadedFile['type']);

    if (empty($sessionId)) {
        $sessionId = api_get_session_id();
    } else {
        $sessionId = intval($sessionId);
    }

    $groupInfo = [];
    if (!empty($groupId)) {
        $groupInfo = GroupManager::get_group_properties($groupId);
    }

    // Just in case process_uploaded_file is not called
    $maxSpace = DocumentManager::get_course_quota();

    // Check if there is enough space to save the file
    if (!DocumentManager::enough_space($uploadedFile['size'], $maxSpace)) {
        if ($output) {
            Display::addFlash(Display::return_message(get_lang('UplNotEnoughSpace'), 'error'));
        }

        return false;
    }

    // If the want to unzip, check if the file has a .zip (or ZIP,Zip,ZiP,...) extension
    if ($unzip == 1 && preg_match('/.zip$/', strtolower($uploadedFile['name']))) {
        return unzip_uploaded_document(
            $courseInfo,
            $userInfo,
            $uploadedFile,
            $uploadPath,
            $documentDir,
            $maxSpace,
            $sessionId,
            $groupId,
            $output,
            $onlyUploadFile
        );
    } elseif ($unzip == 1 && !preg_match('/.zip$/', strtolower($uploadedFile['name']))) {
        // We can only unzip ZIP files (no gz, tar,...)
        if ($output) {
            Display::addFlash(
                Display::return_message(get_lang('UplNotAZip')." ".get_lang('PleaseTryAgain'), 'error')
            );
        }

        return false;
    } else {
        // Clean up the name, only ASCII characters should stay. (and strict)
        $cleanName = api_replace_dangerous_char($uploadedFile['name'], $treat_spaces_as_hyphens);

        // No "dangerous" files
        $cleanName = disable_dangerous_file($cleanName);

        // Checking file extension
        if (!filter_extension($cleanName)) {
            if ($output) {
                Display::addFlash(
                    Display::return_message(get_lang('UplUnableToSaveFileFilteredExtension'), 'error')
                );
            }

            return false;
        } else {
            // If the upload path differs from / (= root) it will need a slash at the end
            if ($uploadPath != '/') {
                $uploadPath = $uploadPath.'/';
            }

            // Full path to where we want to store the file with trailing slash
            $whereToSave = $documentDir.$uploadPath;

            // At least if the directory doesn't exist, tell so
            if (!is_dir($whereToSave)) {
                if (!mkdir($whereToSave, api_get_permissions_for_new_directories())) {
                    if ($output) {
                        Display::addFlash(
                            Display::return_message(
                                get_lang('DestDirectoryDoesntExist').' ('.$uploadPath.')',
                                'error'
                            )
                        );
                    }

                    return false;
                }
            }

            // Just upload the file "as is"
            if ($onlyUploadFile) {
                $errorResult = moveUploadedFile($uploadedFile, $whereToSave.$cleanName);
                if ($errorResult) {
                    return $whereToSave.$cleanName;
                } else {
                    return $errorResult;
                }
            }

            /*
                Based in the clean name we generate a new filesystem name
                Using the session_id and group_id if values are not empty
            */
            $fileSystemName = DocumentManager::fixDocumentName(
                $cleanName,
                'file',
                $courseInfo,
                $sessionId,
                $groupId
            );

            // Name of the document without the extension (for the title)
            $documentTitle = get_document_title($uploadedFile['name']);

            // Size of the uploaded file (in bytes)
            $fileSize = $uploadedFile['size'];

            // File permissions
            $filePermissions = api_get_permissions_for_new_files();

            // Example: /var/www/chamilo/courses/xxx/document/folder/picture.jpg
            $fullPath = $whereToSave.$fileSystemName;

            // Example: /folder/picture.jpg
            $filePath = $uploadPath.$fileSystemName;

            $docId = DocumentManager::get_document_id(
                $courseInfo,
                $filePath,
                $sessionId
            );

            $documentList = DocumentManager::getDocumentByPathInCourse(
                $courseInfo,
                $filePath //$filePath
            );

            // This means that the path already exists in this course.
            if (!empty($documentList) && $whatIfFileExists != 'overwrite') {
                //$found = false;
                // Checking if we are talking about the same course + session
                /*foreach ($documentList as $document) {
                    if ($document['session_id'] == $sessionId) {
                        $found = true;
                        break;
                    }
                }*/

                //if ($found == false) {
                    $whatIfFileExists = 'rename';
                //}
            }

            // What to do if the target file exists
            switch ($whatIfFileExists) {
                // Overwrite the file if it exists
                case 'overwrite':
                    // Check if the target file exists, so we can give another message
                    $fileExists = file_exists($fullPath);

                    if (moveUploadedFile($uploadedFile, $fullPath)) {
                        chmod($fullPath, $filePermissions);

                        if ($fileExists && $docId) {
                            // UPDATE DATABASE
                            $documentId = DocumentManager::get_document_id(
                                $courseInfo,
                                $filePath
                            );
                            if (is_numeric($documentId)) {
                                // Update file size
                                update_existing_document(
                                    $courseInfo,
                                    $documentId,
                                    $uploadedFile['size']
                                );

                                // Update document item_property
                                api_item_property_update(
                                    $courseInfo,
                                    TOOL_DOCUMENT,
                                    $documentId,
                                    'DocumentUpdated',
                                    $userId,
                                    $groupInfo,
                                    $toUserId,
                                    null,
                                    null,
                                    $sessionId
                                );

                                // Redo visibility
                                api_set_default_visibility(
                                    $documentId,
                                    TOOL_DOCUMENT,
                                    null,
                                    $courseInfo
                                );
                            } else {
                                // There might be cases where the file exists on disk but there is no registration of
                                // that in the database
                                // In this case, and if we are in overwrite mode, overwrite and create the db record
                                $documentId = add_document(
                                    $courseInfo,
                                    $filePath,
                                    'file',
                                    $fileSize,
                                    $documentTitle,
                                    $comment,
                                    0,
                                    true,
                                    $groupId,
                                    $sessionId
                                );

                                if ($documentId) {
                                    // Put the document in item_property update
                                    api_item_property_update(
                                        $courseInfo,
                                        TOOL_DOCUMENT,
                                        $documentId,
                                        'DocumentAdded',
                                        $userId,
                                        $groupInfo,
                                        $toUserId,
                                        null,
                                        null,
                                        $sessionId
                                    );

                                    // Redo visibility
                                    api_set_default_visibility(
                                        $documentId,
                                        TOOL_DOCUMENT,
                                        null,
                                        $courseInfo
                                    );
                                }
                            }

                            // If the file is in a folder, we need to update all parent folders
                            item_property_update_on_folder($courseInfo, $uploadPath, $userId);
                            // Display success message with extra info to user
                            if ($output) {
                                Display::addFlash(
                                    Display::return_message(
                                        get_lang('UplUploadSucceeded').'<br /> '.$documentTitle.' '.get_lang('UplFileOverwritten'),
                                        'confirmation',
                                        false
                                    )
                                );
                            }

                            return $filePath;
                        } else {
                            // Put the document data in the database
                            $documentId = add_document(
                                $courseInfo,
                                $filePath,
                                'file',
                                $fileSize,
                                $documentTitle,
                                $comment,
                                0,
                                true,
                                $groupId,
                                $sessionId
                            );

                            if ($documentId) {
                                // Put the document in item_property update
                                api_item_property_update(
                                    $courseInfo,
                                    TOOL_DOCUMENT,
                                    $documentId,
                                    'DocumentAdded',
                                    $userId,
                                    $groupInfo,
                                    $toUserId,
                                    null,
                                    null,
                                    $sessionId
                                );

                                // Redo visibility
                                api_set_default_visibility($documentId, TOOL_DOCUMENT, null, $courseInfo);
                            }

                            // If the file is in a folder, we need to update all parent folders
                            item_property_update_on_folder($courseInfo, $uploadPath, $userId);

                            // Display success message to user
                            if ($output) {
                                Display::addFlash(
                                    Display::return_message(
                                        get_lang('UplUploadSucceeded').'<br /> '.$documentTitle,
                                        'confirmation',
                                        false
                                    )
                                );
                            }

                            return $filePath;
                        }
                    } else {
                        if ($output) {
                            Display::addFlash(
                                Display::return_message(
                                    get_lang('UplUnableToSaveFile'),
                                    'error',
                                    false
                                )
                            );
                        }

                        return false;
                    }
                    break;
                case 'rename':
                    // Rename the file if it exists
                    // Always rename.
                    $cleanName = DocumentManager::getUniqueFileName(
                        $uploadPath,
                        $cleanName,
                        $courseInfo,
                        $sessionId,
                        $groupId
                    );

                    $fileSystemName = DocumentManager::fixDocumentName(
                        $cleanName,
                        'file',
                        $courseInfo,
                        $sessionId,
                        $groupId
                    );

                    $documentTitle = get_document_title($cleanName);
                    $fullPath = $whereToSave.$fileSystemName;
                    $filePath = $uploadPath.$fileSystemName;

                    if (moveUploadedFile($uploadedFile, $fullPath)) {
                        chmod($fullPath, $filePermissions);
                        // Put the document data in the database
                        $documentId = add_document(
                            $courseInfo,
                            $filePath,
                            'file',
                            $fileSize,
                            $documentTitle,
                            $comment, // comment
                            0, // read only
                            true, // save visibility
                            $groupId,
                            $sessionId
                        );

                        if ($documentId) {
                            // Update document item_property
                            api_item_property_update(
                                $courseInfo,
                                TOOL_DOCUMENT,
                                $documentId,
                                'DocumentAdded',
                                $userId,
                                $groupInfo,
                                $toUserId,
                                null,
                                null,
                                $sessionId
                            );

                            // Redo visibility
                            api_set_default_visibility($documentId, TOOL_DOCUMENT, null, $courseInfo);
                        }

                        // If the file is in a folder, we need to update all parent folders
                        item_property_update_on_folder($courseInfo, $uploadPath, $userId);

                        // Display success message to user
                        if ($output) {
                            Display::addFlash(
                                Display::return_message(
                                    get_lang('UplUploadSucceeded').'<br />'.get_lang('UplFileSavedAs').' '.$documentTitle,
                                    'success',
                                    false
                                )
                            );
                        }

                        return $filePath;
                    } else {
                        if ($output) {
                            Display::addFlash(
                                Display::return_message(
                                    get_lang('UplUnableToSaveFile'),
                                    'error',
                                    false
                                )
                            );
                        }

                        return false;
                    }
                    break;
                default:
                    // Only save the file if it doesn't exist or warn user if it does exist
                    if (file_exists($fullPath) && $docId) {
                        if ($output) {
                            Display::addFlash(
                                Display::return_message($cleanName.' '.get_lang('UplAlreadyExists'), 'error', false)
                            );
                        }
                    } else {
                        if (moveUploadedFile($uploadedFile, $fullPath)) {
                            chmod($fullPath, $filePermissions);

                            // Put the document data in the database
                            $documentId = add_document(
                                $courseInfo,
                                $filePath,
                                'file',
                                $fileSize,
                                $documentTitle,
                                $comment,
                                0,
                                true,
                                $groupId,
                                $sessionId
                            );

                            if ($documentId) {
                                // Update document item_property
                                api_item_property_update(
                                    $courseInfo,
                                    TOOL_DOCUMENT,
                                    $documentId,
                                    'DocumentAdded',
                                    $userId,
                                    $groupInfo,
                                    $toUserId,
                                    null,
                                    null,
                                    $sessionId
                                );
                                // Redo visibility
                                api_set_default_visibility($documentId, TOOL_DOCUMENT, null, $courseInfo);
                            }

                            // If the file is in a folder, we need to update all parent folders
                            item_property_update_on_folder(
                                $courseInfo,
                                $uploadPath,
                                $userId
                            );

                            // Display success message to user
                            if ($output) {
                                Display::addFlash(
                                    Display::display_confirmation_message(
                                        get_lang('UplUploadSucceeded').'<br /> '.$documentTitle,
                                        false,
                                        true
                                    )
                                );
                            }

                            return $filePath;
                        } else {
                            if ($output) {
                                Display::addFlash(
                                    Display::return_message(
                                        get_lang('UplUnableToSaveFile'),
                                        'error',
                                        false
                                    )
                                );
                            }

                            return false;
                        }
                    }
                    break;
            }
        }
    }
}

/**
 * @param string $file
 * @param string $storePath
 *
 * @return bool
 */
function moveUploadedFile($file, $storePath)
{
    $handleFromFile = isset($file['from_file']) && $file['from_file'] ? true : false;
    $moveFile = isset($file['move_file']) && $file['move_file'] ? true : false;
    if ($moveFile) {
        copy($file['tmp_name'], $storePath);
    }
    if ($handleFromFile) {
        return file_exists($file['tmp_name']);
    } else {
        return move_uploaded_file($file['tmp_name'], $storePath);
    }
}

/**
 * Checks if there is enough place to add a file on a directory
 * on the base of a maximum directory size allowed
 * deprecated: use enough_space instead!
 * @author Hugues Peeters <peeters@ipm.ucl.ac.be>
 * @param  int $file_size Size of the file in byte
 * @param  string $dir Path of the directory where the file should be added
 * @param  int $max_dir_space Maximum size of the diretory in byte
 * @return boolean true if there is enough space, false otherwise
 * @see enough_size() uses  dir_total_space() function
 */
function enough_size($file_size, $dir, $max_dir_space)
{
    // If the directory is the archive directory, safely ignore the size limit
    if (api_get_path(SYS_ARCHIVE_PATH) == $dir) {
        return true;
    }

    if ($max_dir_space) {
        $already_filled_space = dir_total_space($dir);
        if (($file_size + $already_filled_space) > $max_dir_space) {
            return false;
        }
    }

    return true;
}

/**
 * Computes the size already occupied by a directory and is subdirectories
 *
 * @author Hugues Peeters <peeters@ipm.ucl.ac.be>
 * @param string $dir_path Size of the file in byte
 * @return int Return the directory size in bytes
 */
function dir_total_space($dir_path)
{
    $save_dir = getcwd();
    chdir($dir_path);
    $handle = opendir($dir_path);
    $sumSize = 0;
    $dirList = array();
    while ($element = readdir($handle)) {
        if ($element == '.' || $element == '..') {
            continue; // Skip the current and parent directories
        }
        if (is_file($element)) {
            $sumSize += filesize($element);
        }
        if (is_dir($element)) {
            $dirList[] = $dir_path.'/'.$element;
        }
    }

    closedir($handle);

    if (sizeof($dirList) > 0) {
        foreach ($dirList as $j) {
            $sizeDir = dir_total_space($j); // Recursivity
            $sumSize += $sizeDir;
        }
    }
    chdir($save_dir); // Return to initial position

    return $sumSize;
}

/**
 * Tries to add an extension to files without extension
 * Some applications on Macintosh computers don't add an extension to the files.
 * This subroutine try to fix this on the basis of the MIME type sent
 * by the browser.
 *
 * Note : some browsers don't send the MIME Type (e.g. Netscape 4).
 *        We don't have solution for this kind of situation
 *
 * @author Hugues Peeters <peeters@ipm.ucl.ac.be>
 * @author Bert Vanderkimpen
 * @param  string $file_name Name of the file
 * @param  string $file_type Type of the file
 * @return string File name
 */
function add_ext_on_mime($file_name, $file_type)
{
    // Check whether the file has an extension AND whether the browser has sent a MIME Type

    if (!preg_match('/^.*\.[a-zA-Z_0-9]+$/', $file_name) && $file_type) {

        // Build a "MIME-types / extensions" connection table

        static $mime_type = array();

        $mime_type[] = 'application/msword'; $extension[] = '.doc';
        $mime_type[] = 'application/rtf'; $extension[] = '.rtf';
        $mime_type[] = 'application/vnd.ms-powerpoint'; $extension[] = '.ppt';
        $mime_type[] = 'application/vnd.ms-excel'; $extension[] = '.xls';
        $mime_type[] = 'application/pdf'; $extension[] = '.pdf';
        $mime_type[] = 'application/postscript'; $extension[] = '.ps';
        $mime_type[] = 'application/mac-binhex40'; $extension[] = '.hqx';
        $mime_type[] = 'application/x-gzip'; $extension[] = 'tar.gz';
        $mime_type[] = 'application/x-shockwave-flash'; $extension[] = '.swf';
        $mime_type[] = 'application/x-stuffit'; $extension[] = '.sit';
        $mime_type[] = 'application/x-tar'; $extension[] = '.tar';
        $mime_type[] = 'application/zip'; $extension[] = '.zip';
        $mime_type[] = 'application/x-tar'; $extension[] = '.tar';
        $mime_type[] = 'text/html'; $extension[] = '.html';
        $mime_type[] = 'text/plain'; $extension[] = '.txt';
        $mime_type[] = 'text/rtf'; $extension[] = '.rtf';
        $mime_type[] = 'img/gif'; $extension[] = '.gif';
        $mime_type[] = 'img/jpeg'; $extension[] = '.jpg';
        $mime_type[] = 'img/png'; $extension[] = '.png';
        $mime_type[] = 'audio/midi'; $extension[] = '.mid';
        $mime_type[] = 'audio/mpeg'; $extension[] = '.mp3';
        $mime_type[] = 'audio/x-aiff'; $extension[] = '.aif';
        $mime_type[] = 'audio/x-pn-realaudio'; $extension[] = '.rm';
        $mime_type[] = 'audio/x-pn-realaudio-plugin'; $extension[] = '.rpm';
        $mime_type[] = 'audio/x-wav'; $extension[] = '.wav';
        $mime_type[] = 'video/mpeg'; $extension[] = '.mpg';
        $mime_type[] = 'video/mpeg4-generic'; $extension[] = '.mp4';
        $mime_type[] = 'video/quicktime'; $extension[] = '.mov';
        $mime_type[] = 'video/x-msvideo'; $extension[] = '.avi';

        $mime_type[] = 'video/x-ms-wmv'; $extension[] = '.wmv';
        $mime_type[] = 'video/x-flv'; $extension[] = '.flv';
        $mime_type[] = 'image/svg+xml'; $extension[] = '.svg';
        $mime_type[] = 'image/svg+xml'; $extension[] = '.svgz';
        $mime_type[] = 'video/ogg'; $extension[] = '.ogv';
        $mime_type[] = 'audio/ogg'; $extension[] = '.oga';
        $mime_type[] = 'application/ogg'; $extension[] = '.ogg';
        $mime_type[] = 'application/ogg'; $extension[] = '.ogx';
        $mime_type[] = 'application/x-freemind'; $extension[] = '.mm';

        $mime_type[] = 'application/vnd.ms-word.document.macroEnabled.12'; $extension[] = '.docm';
        $mime_type[] = 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'; $extension[] = '.docx';
        $mime_type[] = 'application/vnd.ms-word.template.macroEnabled.12'; $extension[] = '.dotm';
        $mime_type[] = 'application/vnd.openxmlformats-officedocument.wordprocessingml.template'; $extension[] = '.dotx';
        $mime_type[] = 'application/vnd.ms-powerpoint.template.macroEnabled.12'; $extension[] = '.potm';
        $mime_type[] = 'application/vnd.openxmlformats-officedocument.presentationml.template'; $extension[] = '.potx';
        $mime_type[] = 'application/vnd.ms-powerpoint.addin.macroEnabled.12'; $extension[] = '.ppam';
        $mime_type[] = 'application/vnd.ms-powerpoint.slideshow.macroEnabled.12'; $extension[] = '.ppsm';
        $mime_type[] = 'application/vnd.openxmlformats-officedocument.presentationml.slideshow'; $extension[] = '.ppsx';
        $mime_type[] = 'application/vnd.ms-powerpoint.presentation.macroEnabled.12'; $extension[] = '.pptm';
        $mime_type[] = 'application/vnd.openxmlformats-officedocument.presentationml.presentation'; $extension[] = '.pptx';
        $mime_type[] = 'application/vnd.ms-excel.addin.macroEnabled.12'; $extension[] = '.xlam';
        $mime_type[] = 'application/vnd.ms-excel.sheet.binary.macroEnabled.12'; $extension[] = '.xlsb';
        $mime_type[] = 'application/vnd.ms-excel.sheet.macroEnabled.12'; $extension[] = '.xlsm';
        $mime_type[] = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'; $extension[] = '.xlsx';
        $mime_type[] = 'application/vnd.ms-excel.template.macroEnabled.12'; $extension[] = '.xltm';
        $mime_type[] = 'application/vnd.openxmlformats-officedocument.spreadsheetml.template'; $extension[] = '.xltx';

        // Test on PC (files with no extension get application/octet-stream)
        //$mime_type[] = 'application/octet-stream';      $extension[] = '.ext';

        // Check whether the MIME type sent by the browser is within the table

        foreach ($mime_type as $key => & $type) {
            if ($type == $file_type) {
                $file_name .= $extension[$key];
                break;
            }
        }

        unset($mime_type, $extension, $type, $key); // Delete to eschew possible collisions
    }

    return $file_name;
}

/**
 * Manages all the unzipping process of an uploaded file
 *
 * @author Hugues Peeters <hugues.peeters@claroline.net>
 *
 * @param  array  $uploaded_file - follows the $_FILES Structure
 * @param  string $upload_path   - destination of the upload.
 *                                This path is to append to $base_work_dir
 * @param  string $base_work_dir  - base working directory of the module
 * @param  int $max_filled_space  - amount of bytes to not exceed in the base
 *                                working directory
 *
 * @return boolean true if it succeeds false otherwise
 */
function unzip_uploaded_file($uploaded_file, $upload_path, $base_work_dir, $max_filled_space)
{
    $zip_file = new PclZip($uploaded_file['tmp_name']);

    // Check the zip content (real size and file extension)
    if (file_exists($uploaded_file['tmp_name'])) {
        $zip_content_array = $zip_file->listContent();
        $ok_scorm = false;
        $realFileSize = 0;
        foreach ($zip_content_array as & $this_content) {
            if (preg_match('~.(php.*|phtml)$~i', $this_content['filename'])) {
                Display::addFlash(
                    Display::return_message(get_lang('ZipNoPhp'))
                );

                return false;
            } elseif (stristr($this_content['filename'], 'imsmanifest.xml')) {
                $ok_scorm = true;
            } elseif (stristr($this_content['filename'], 'LMS')) {
                $ok_plantyn_scorm1 = true;
            } elseif (stristr($this_content['filename'], 'REF')) {
                $ok_plantyn_scorm2 = true;
            } elseif (stristr($this_content['filename'], 'SCO')) {
                $ok_plantyn_scorm3 = true;
            } elseif (stristr($this_content['filename'], 'AICC')) {
                $ok_aicc_scorm = true;
            }
            $realFileSize += $this_content['size'];
        }

        if (($ok_plantyn_scorm1 && $ok_plantyn_scorm2 && $ok_plantyn_scorm3) || $ok_aicc_scorm) {
            $ok_scorm = true;
        }

        if (!$ok_scorm && defined('CHECK_FOR_SCORM') && CHECK_FOR_SCORM) {
            Display::addFlash(
                Display::return_message(get_lang('NotScormContent'))
            );

            return false;
        }

        if (!enough_size($realFileSize, $base_work_dir, $max_filled_space)) {
            Display::addFlash(
                Display::return_message(get_lang('NoSpace'))
            );

            return false;
        }

        // It happens on Linux that $upload_path sometimes doesn't start with '/'
        if ($upload_path[0] != '/' && substr($base_work_dir, -1, 1) != '/') {
            $upload_path = '/'.$upload_path;
        }

        if ($upload_path[strlen($upload_path) - 1] == '/') {
            $upload_path = substr($upload_path, 0, -1);
        }

        /*	Uncompressing phase */

        /*
            The first version, using OS unzip, is not used anymore
            because it does not return enough information.
            We need to process each individual file in the zip archive to
            - add it to the database
            - parse & change relative html links
        */
        if (PHP_OS == 'Linux' && !get_cfg_var('safe_mode') && false) { // *** UGent, changed by OC ***
            // Shell Method - if this is possible, it gains some speed
            exec("unzip -d \"".$base_work_dir.$upload_path."/\"".$uploaded_file['name']." ".$uploaded_file['tmp_name']);
        } else {
            // PHP method - slower...
            $save_dir = getcwd();
            chdir($base_work_dir.$upload_path);
            $unzippingState = $zip_file->extract();
            for ($j = 0; $j < count($unzippingState); $j++) {
                $state = $unzippingState[$j];

                // Fix relative links in html files
                $extension = strrchr($state['stored_filename'], '.');
            }
            if ($dir = @opendir($base_work_dir.$upload_path)) {
                while ($file = readdir($dir)) {
                    if ($file != '.' && $file != '..') {

                        $filetype = 'file';
                        if (is_dir($base_work_dir.$upload_path.'/'.$file)) $filetype = 'folder';

                        $safe_file = api_replace_dangerous_char($file);
                        @rename($base_work_dir.$upload_path.'/'.$file, $base_work_dir.$upload_path.'/'.$safe_file);
                        set_default_settings($upload_path, $safe_file, $filetype);
                    }
                }

                closedir($dir);
            } else {
                error_log('Could not create directory '.$base_work_dir.$upload_path.' to unzip files');
            }
            chdir($save_dir); // Back to previous dir position
        }
    }

    return true;
}

/**
 * Manages all the unzipping process of an uploaded document
 * This uses the item_property table for properties of documents
 *
 * @author Hugues Peeters <hugues.peeters@claroline.net>
 * @author Bert Vanderkimpen
 *
 * @param array  $courseInfo
 * @param array  $userInfo
 * @param array  $uploaded_file - follows the $_FILES Structure
 * @param string $uploadPath   - destination of the upload.
 *                               This path is to append to $base_work_dir
 * @param string $base_work_dir  - base working directory of the module
 * @param int    $maxFilledSpace  - amount of bytes to not exceed in the base
 *                                working directory
 * @param int $sessionId
 * @param int $groupId group.id
 * @param bool $output Optional. If no output not wanted on success, set to false.
 * @param bool $onlyUploadFile
 *
 * @return boolean true if it succeeds false otherwise
 */
function unzip_uploaded_document(
    $courseInfo,
    $userInfo,
    $uploaded_file,
    $uploadPath,
    $base_work_dir,
    $maxFilledSpace,
    $sessionId = 0,
    $groupId = 0,
    $output = true,
    $onlyUploadFile = false
) {
    $zip = new PclZip($uploaded_file['tmp_name']);

    // Check the zip content (real size and file extension)
    $zip_content_array = (array) $zip->listContent();

    $realSize = 0;
    foreach ($zip_content_array as & $this_content) {
        $realSize += $this_content['size'];
    }

    if (!DocumentManager::enough_space($realSize, $maxFilledSpace)) {
        Display::display_error_message(get_lang('UplNotEnoughSpace'));
        return false;
    }

    $folder = api_get_unique_id();
    $destinationDir = api_get_path(SYS_ARCHIVE_PATH).$folder;
    mkdir($destinationDir, api_get_permissions_for_new_directories(), true);

    /*	Uncompress zip file*/
    // We extract using a callback function that "cleans" the path
    $zip->extract(
        PCLZIP_OPT_PATH,
        $destinationDir,
        PCLZIP_CB_PRE_EXTRACT,
        'clean_up_files_in_zip',
        PCLZIP_OPT_REPLACE_NEWER
    );

    if ($onlyUploadFile === false) {
        // Add all documents in the unzipped folder to the database
        add_all_documents_in_folder_to_database(
            $courseInfo,
            $userInfo,
            $base_work_dir,
            $destinationDir,
            $sessionId,
            $groupId,
            $output,
            array('path' => $uploadPath)
        );
    } else {
        // Copy result
        $fs = new \Symfony\Component\Filesystem\Filesystem();
        $fs->mirror($destinationDir, $base_work_dir.$uploadPath, null, ['overwrite']);
    }

    if (is_dir($destinationDir)) {
        rmdirr($destinationDir);
    }

    return true;
}

/**
 * This function is a callback function that is used while extracting a zipfile
 * http://www.phpconcept.net/pclzip/man/en/index.php?options-pclzip_cb_pre_extract
 *
 * @param array $p_event
 * @param array $p_header
 * @return int (If the function returns 1, then the extraction is resumed, if 0 the path was skipped)
 */
function clean_up_files_in_zip($p_event, &$p_header)
{
    $originalStoredFileName = $p_header['stored_filename'];
    $modifiedStoredFileName = clean_up_path($originalStoredFileName);
    $p_header['filename'] = str_replace($originalStoredFileName, $modifiedStoredFileName, $p_header['filename']);

    return 1;
}

/**
 * This function cleans up a given path
 * by eliminating dangerous file names and cleaning them
 *
 * @param string $path
 *
 * @return string
 *
 * @see disable_dangerous_file()
 * @see api_replace_dangerous_char()
 */
function clean_up_path($path)
{
    // Split the path in folders and files
    $path_array = explode('/', $path);
    // Clean up every folder and filename in the path
    foreach ($path_array as $key => & $val) {
        // We don't want to lose the dots in ././folder/file (cfr. zipfile)
        if ($val != '.') {
            $val = disable_dangerous_file(api_replace_dangerous_char($val));
        }
    }
    // Join the "cleaned" path (modified in-place as passed by reference)
    $path = implode('/', $path_array);
    filter_extension($path);

    return $path;
}

/**
 * Checks if the file is dangerous, based on extension and/or mimetype.
 * The list of extensions accepted/rejected can be found from
 * api_get_setting('upload_extensions_exclude') and api_get_setting('upload_extensions_include')
 * @param	string 	filename passed by reference. The filename will be modified
 * if filter rules say so! (you can include path but the filename should look like 'abc.html')
 * @return	int		0 to skip file, 1 to keep file
 */
function filter_extension(&$filename)
{
    if (substr($filename, -1) == '/') {
        return 1; // Authorize directories
    }
    $blacklist = api_get_setting('upload_extensions_list_type');
    if ($blacklist != 'whitelist') { // if = blacklist
        $extensions = explode(';', strtolower(api_get_setting('upload_extensions_blacklist')));

        $skip = api_get_setting('upload_extensions_skip');
        $ext = strrchr($filename, '.');
        $ext = substr($ext, 1);
        if (empty($ext)) {
            return 1; // We're in blacklist mode, so accept empty extensions
        }
        if (in_array(strtolower($ext), $extensions)) {
            if ($skip == 'true') {
                return 0;
            } else {
                $new_ext = api_get_setting('upload_extensions_replace_by');
                $filename = str_replace('.'.$ext, '.'.$new_ext, $filename);
                return 1;
            }
        } else {
            return 1;
        }
    } else {
        $extensions = explode(';', strtolower(api_get_setting('upload_extensions_whitelist')));
        $skip = api_get_setting('upload_extensions_skip');
        $ext = strrchr($filename, '.');
        $ext = substr($ext, 1);
        if (empty($ext)) {
            return 1; // Accept empty extensions
        }
        if (!in_array(strtolower($ext), $extensions)) {
            if ($skip == 'true') {
                return 0;
            } else {
                $new_ext = api_get_setting('upload_extensions_replace_by');
                $filename = str_replace('.'.$ext, '.'.$new_ext, $filename);
                return 1;
            }
        } else {
            return 1;
        }
    }
}

/**
 * Adds a new document to the database
 *
 * @param array $_course
 * @param string $path
 * @param string $filetype
 * @param int $filesize
 * @param string $title
 * @param string $comment
 * @param int $readonly
 * @param bool $save_visibility
 * @param int $group_id group.id
 * @param int $session_id Session ID, if any
 * @param int $userId creator id
 *
 * @return int id if inserted document
 */
function add_document(
    $_course,
    $path,
    $filetype,
    $filesize,
    $title,
    $comment = null,
    $readonly = 0,
    $save_visibility = true,
    $group_id = null,
    $session_id = 0,
    $userId = 0
) {
    $session_id = empty($session_id) ? api_get_session_id() : $session_id;
    $userId = empty($userId) ? api_get_user_id() : $userId;

    $readonly = intval($readonly);
    $c_id = $_course['real_id'];
    $table_document = Database::get_course_table(TABLE_DOCUMENT);

    $params = [
        'c_id' => $c_id,
        'path' => $path,
        'filetype' => $filetype,
        'size' => $filesize,
        'title' => $title,
        'comment' => $comment,
        'readonly' => $readonly,
        'session_id' => $session_id,
    ];
    $documentId = Database::insert($table_document, $params);
    if ($documentId) {
        $sql = "UPDATE $table_document SET id = iid WHERE iid = $documentId";
        Database::query($sql);

        if ($save_visibility) {
            api_set_default_visibility(
                $documentId,
                TOOL_DOCUMENT,
                $group_id,
                $_course,
                $session_id,
                $userId
            );
        }

        return $documentId;
    } else {
        return false;
    }
}

/**
 * Updates an existing document in the database
 * as the file exists, we only need to change the size
 *
 * @param array $_course
 * @param int $documentId
 * @param int $filesize
 * @param int $readonly
 * @return boolean true /false
 */
function update_existing_document($_course, $documentId, $filesize, $readonly = 0)
{
    $document_table = Database::get_course_table(TABLE_DOCUMENT);
    $documentId = intval($documentId);
    $filesize = intval($filesize);
    $readonly = intval($readonly);
    $course_id = $_course['real_id'];

    $sql = "UPDATE $document_table SET
            size = '$filesize',
            readonly = '$readonly'
			WHERE c_id = $course_id AND id = $documentId";
    if (Database::query($sql)) {
        return true;
    } else {
        return false;
    }
}

/**
 * This function updates the last_edit_date, last edit user id on all folders in a given path
 *
 * @param array $_course
 * @param string $path
 * @param int $user_id
 */
function item_property_update_on_folder($_course, $path, $user_id)
{
    // If we are in the root, just return... no need to update anything
    if ($path == '/') {
        return;
    }

    $user_id = intval($user_id);

    // If the given path ends with a / we remove it
    $endchar = substr($path, strlen($path) - 1, 1);
    if ($endchar == '/') {
        $path = substr($path, 0, strlen($path) - 1);
    }

    $table = Database::get_course_table(TABLE_ITEM_PROPERTY);

    // Get the time
    $time = date('Y-m-d H:i:s', time());

    // Det all paths in the given path
    // /folder/subfolder/subsubfolder/file
    // if file is updated, subsubfolder, subfolder and folder are updated

    $exploded_path = explode('/', $path);
    $course_id = api_get_course_int_id();
    $newpath = '';
    foreach ($exploded_path as $key => & $value) {
        // We don't want a slash before our first slash
        if ($key != 0) {
            $newpath .= '/'.$value;

            //echo 'path= '.$newpath.'<br />';
            // Select ID of given folder
            $folder_id = DocumentManager::get_document_id($_course, $newpath);

            if ($folder_id) {
                $sql = "UPDATE $table SET
				        lastedit_date='$time',lastedit_type='DocumentInFolderUpdated', lastedit_user_id='$user_id'
						WHERE c_id = $course_id AND tool='".TOOL_DOCUMENT."' AND ref='$folder_id'";
                Database::query($sql);
            }
        }
    }
}

/**
 * Returns the directory depth of the file.
 *
 * @author	Olivier Cauberghe <olivier.cauberghe@ugent.be>
 * @param	path+filename eg: /main/document/document.php
 * @return	The directory depth
 */
function get_levels($filename) {
    $levels = explode('/', $filename);
    if (empty($levels[count($levels) - 1])) {
        unset($levels[count($levels) - 1]);
    }
    return count($levels);
}

/**
 * Adds file to document table in database
 * deprecated: use file_set_default_settings instead
 *
 * @author	Olivier Cauberghe <olivier.cauberghe@ugent.be>
 * @param	path,filename
 * action:	Adds an entry to the document table with the default settings.
 */
function set_default_settings($upload_path, $filename, $filetype = 'file')
{
    $dbTable = Database::get_course_table(TABLE_DOCUMENT);
    global $default_visibility;

    if (!$default_visibility) {
        $default_visibility = 'v';
    }
    $filetype = Database::escape_string($filetype);

    $upload_path = str_replace('\\', '/', $upload_path);
    $upload_path = str_replace('//', '/', $upload_path);

    if ($upload_path == '/') {
        $upload_path = '';
    } elseif (!empty($upload_path) && $upload_path[0] != '/') {
        $upload_path = "/$upload_path";
    }

    $endchar = substr($filename, strlen($filename) - 1, 1);

    if ($endchar == '/') {
        $filename = substr($filename, 0, -1);
    }
    $filename = Database::escape_string($filename);
    $query = "SELECT count(*) as bestaat FROM $dbTable
              WHERE path='$upload_path/$filename'";
    $result = Database::query($query);
    $row = Database::fetch_array($result);
    if ($row['bestaat'] > 0) {
        $query = "UPDATE $dbTable SET
		            path='$upload_path/$filename',
		            visibility='$default_visibility',
		            filetype='$filetype'
		          WHERE path='$upload_path/$filename'";
    } else {
        $query = "INSERT INTO $dbTable (path,visibility,filetype)
		          VALUES('$upload_path/$filename','$default_visibility','$filetype')";
    }
    Database::query($query);
}

/**
 * Retrieves the image path list in a html file
 *
 * @author Hugues Peeters <hugues.peeters@claroline.net>
 * @param  string $html_file
 * @return array -  images path list
 */
function search_img_from_html($html_file) {

    $img_path_list = array();

    if (!$fp = fopen($html_file, 'r')) {
        return;
    }

    // Aearch and store occurences of the <img> tag in an array
    $size_file = (filesize($html_file) === 0) ? 1 : filesize($html_file);
    if (isset($fp) && $fp !== false) {
        $buffer = fread($fp, $size_file);
        if (strlen($buffer) >= 0 && $buffer !== false) {
            //
        } else {
            die('<center>Can not read file.</center>');
        }
    } else {
        die('<center>Can not read file.</center>');
    }
    $matches = array();
    if (preg_match_all('~<[[:space:]]*img[^>]*>~i', $buffer, $matches)) {
        $img_tag_list = $matches[0];
    }

    fclose($fp);
    unset($buffer);

    // Search the image file path from all the <IMG> tag detected

    if (sizeof($img_tag_list) > 0) {
        foreach ($img_tag_list as & $this_img_tag) {
            if (preg_match('~src[[:space:]]*=[[:space:]]*[\"]{1}([^\"]+)[\"]{1}~i', $this_img_tag, $matches)) {
                $img_path_list[] = $matches[1];
            }
        }
        $img_path_list = array_unique($img_path_list); // Remove duplicate entries
    }

    return $img_path_list;
}

/**
 * Creates a new directory trying to find a directory name
 * that doesn't already exist
 *
 * @author  Hugues Peeters <hugues.peeters@claroline.net>
 * @author  Bert Vanderkimpen
 * @param   array   $_course current course information
 * @param   int     $user_id current user id
 * @param   int     $session_id
 * @param   int     $to_group_id group.id
 * @param   int     $to_user_id
 * @param   string  $base_work_dir /var/www/chamilo/courses/ABC/document
 * @param   string  $desired_dir_name complete path of the desired name
 * Example: /folder1/folder2
 * @param   string  $title "folder2"
 * @param   int     $visibility (0 for invisible, 1 for visible, 2 for deleted)
 * @param   bool $generateNewNameIfExists
 * @return  string  actual directory name if it succeeds,
 *          boolean false otherwise
 */
function create_unexisting_directory(
    $_course,
    $user_id,
    $session_id,
    $to_group_id,
    $to_user_id,
    $base_work_dir,
    $desired_dir_name,
    $title = null,
    $visibility = null,
    $generateNewNameIfExists = false
) {
    $course_id = $_course['real_id'];
    $session_id = intval($session_id);

    $folderExists = DocumentManager::folderExists(
        $desired_dir_name,
        $_course,
        $session_id,
        $to_group_id
    );

    if ($folderExists === true) {
        if ($generateNewNameIfExists) {
            $counter = 1;
            while (1) {
                $folderExists = DocumentManager::folderExists(
                    $desired_dir_name.'_'.$counter,
                    $_course,
                    $session_id,
                    $to_group_id
                );

                if ($folderExists === false) {
                    break;
                }
                $counter++;
            }
            $desired_dir_name = $desired_dir_name.'_'.$counter;
        } else {

            return false;
        }
    }

    $systemFolderName = $desired_dir_name;

    // Adding suffix
    $suffix = DocumentManager::getDocumentSuffix(
        $_course,
        $session_id,
        $to_group_id
    );

    $systemFolderName .= $suffix;

    if ($title == null) {
        $title = basename($desired_dir_name);
    }

    if (!is_dir($base_work_dir.$systemFolderName)) {
        $result = mkdir(
            $base_work_dir.$systemFolderName,
            api_get_permissions_for_new_directories(),
            true
        );

        if ($result) {

            // Check if pathname already exists inside document table
            $tbl_document = Database::get_course_table(TABLE_DOCUMENT);
            $sql = "SELECT id, path FROM $tbl_document
                    WHERE
                        c_id = $course_id AND
                        (
                            path = '".Database::escape_string($systemFolderName)."'
                        )
            ";

            $groupInfo = [];
            if (!empty($to_group_id)) {
                $groupInfo = GroupManager::get_group_properties($to_group_id);
            }

            $rs = Database::query($sql);
            if (Database::num_rows($rs) == 0) {
                $document_id = add_document(
                    $_course,
                    $systemFolderName,
                    'folder',
                    0,
                    $title,
                    null,
                    0,
                    true,
                    $to_group_id,
                    $session_id,
                    $user_id
                );

                if ($document_id) {
                    // Update document item_property
                    if (!empty($visibility)) {
                        $visibilities = array(
                            0 => 'invisible',
                            1 => 'visible',
                            2 => 'delete'
                        );
                        api_item_property_update(
                            $_course,
                            TOOL_DOCUMENT,
                            $document_id,
                            $visibilities[$visibility],
                            $user_id,
                            $groupInfo,
                            $to_user_id,
                            null,
                            null,
                            $session_id
                        );
                    } else {
                        api_item_property_update(
                            $_course,
                            TOOL_DOCUMENT,
                            $document_id,
                            'FolderCreated',
                            $user_id,
                            $groupInfo,
                            $to_user_id,
                            null,
                            null,
                            $session_id
                        );
                    }

                    $documentData = DocumentManager::get_document_data_by_id(
                        $document_id,
                        $_course['code'],
                        false,
                        $session_id
                    );

                    return $documentData;
                }
            } else {
                $document = Database::fetch_array($rs);
                $documentData = DocumentManager::get_document_data_by_id(
                    $document['id'],
                    $_course['code'],
                    false,
                    $session_id
                );

                /* This means the folder NOT exist in the filesystem
                 (now this was created) but there is a record in the Database*/

                return $documentData;
            }
        }
    }

    return false;
}

/**
 * Handles uploaded missing images
 *
 * @author Hugues Peeters <hugues.peeters@claroline.net>
 * @author Bert Vanderkimpen
 * @param array $_course
 * @param array $uploaded_file_collection - follows the $_FILES Structure
 * @param string $base_work_dir
 * @param string $missing_files_dir
 * @param int $user_id
 * @param int $to_group_id group.id
 */
function move_uploaded_file_collection_into_directory(
    $_course,
    $uploaded_file_collection,
    $base_work_dir,
    $missing_files_dir,
    $user_id,
    $to_group_id,
    $to_user_id,
    $max_filled_space
) {
    $number_of_uploaded_images = count($uploaded_file_collection['name']);
    $new_file_list = array();
    for ($i = 0; $i < $number_of_uploaded_images; $i++) {
        $missing_file['name'] = $uploaded_file_collection['name'][$i];
        $missing_file['type'] = $uploaded_file_collection['type'][$i];
        $missing_file['tmp_name'] = $uploaded_file_collection['tmp_name'][$i];
        $missing_file['error'] = $uploaded_file_collection['error'][$i];
        $missing_file['size'] = $uploaded_file_collection['size'][$i];

        $upload_ok = process_uploaded_file($missing_file);
        if ($upload_ok) {
            $new_file_list[] = handle_uploaded_document(
                $_course,
                $missing_file,
                $base_work_dir,
                $missing_files_dir,
                $user_id,
                $to_group_id,
                $to_user_id,
                $max_filled_space,
                0,
                'overwrite'
            );
        }
        unset($missing_file);
    }
    return $new_file_list;
}

/**
 * Opens the old html file and replace the src path into the img tag
 * This also works for files in subdirectories.
 * @param $original_img_path is an array
 * @param $new_img_path is an array
 */
function replace_img_path_in_html_file($original_img_path, $new_img_path, $html_file)
{
    // Open the file

    $fp = fopen($html_file, 'r');
    $buffer = fread($fp, filesize($html_file));
    $new_html_content = '';

    // Fix the image tags

    for ($i = 0, $fileNb = count($original_img_path); $i < $fileNb; $i++) {
        $replace_what = $original_img_path[$i];
        // We only need the directory and the filename /path/to/file_html_files/missing_file.gif -> file_html_files/missing_file.gif
        $exploded_file_path = explode('/', $new_img_path[$i]);
        $replace_by = $exploded_file_path[count($exploded_file_path) - 2].'/'.$exploded_file_path[count($exploded_file_path) - 1];
        $buffer = str_replace($replace_what, $replace_by, $buffer);
    }

    $new_html_content .= $buffer;

    @fclose($fp);

    // Write the resulted new file

    if (!$fp = fopen($html_file, 'w')) {
        return;
    }

    if (!fwrite($fp, $new_html_content)) {
        return;
    }
}

/**
 * Creates a file containing an html redirection to a given url
 *
 * @author Hugues Peeters <hugues.peeters@claroline.net>
 * @param string $file_path
 * @param string $url
 * @return void
 */
function create_link_file($file_path, $url)
{
    $file_content = '<html>'
        .'<head>'
        .'<meta http-equiv="refresh" content="1;url='.$url.'">'
        .'</head>'
        .'<body>'
        .'</body>'
        .'</html>';
    if (file_exists($file_path)) {
        if (!($fp = fopen($file_path, 'w'))) {
            return false;
        }
        return fwrite($fp, $file_content);
    }
}

/**
 * Checks the extension of a file, if it's .htm or .html
 * we use search_img_from_html to get all image paths in the file
 *
 * @param string $file
 * @return array paths
 * @see check_for_missing_files() uses search_img_from_html()
 */
function check_for_missing_files($file)
{
    if (strrchr($file, '.') == '.htm' || strrchr($file, '.') == '.html') {
        $img_file_path = search_img_from_html($file);
        return $img_file_path;
    }
    return false;
}

/**
 * This function builds a form that asks for the missing images in a html file
 * maybe we should do this another way?
 *
 * @param array $missing_files
 * @param string $upload_path
 * @param string $file_name
 * @return string the form
 */
function build_missing_files_form($missing_files, $upload_path, $file_name)
{
    // Do we need a / or not?
    $added_slash = ($upload_path == '/') ? '' : '/';
    $folder_id = DocumentManager::get_document_id(api_get_course_info(), $upload_path);
    // Build the form
    $form = "<p><strong>".get_lang('MissingImagesDetected')."</strong></p>"
        ."<form method=\"post\" action=\"".api_get_self()."\" enctype=\"multipart/form-data\">"
        // Related_file is the path to the file that has missing images
        ."<input type=\"hidden\" name=\"related_file\" value=\"".$upload_path.$added_slash.$file_name."\" />"
        ."<input type=\"hidden\" name=\"upload_path\" value=\"".$upload_path."\" />"
        ."<input type=\"hidden\" name=\"id\" value=\"".$folder_id."\" />"
        ."<table border=\"0\">";
    foreach ($missing_files as & $this_img_file_path) {
        $form .= "<tr>"
            ."<td>".basename($this_img_file_path)." : </td>"
            ."<td>"
            ."<input type=\"file\" name=\"img_file[]\"/>"
            ."<input type=\"hidden\" name=\"img_file_path[]\" value=\"".$this_img_file_path."\" />"
            ."</td>"
            ."</tr>";
    }
    $form .= "</table>"
        ."<button type='submit' name=\"cancel_submit_image\" value=\"".get_lang('Cancel')."\" class=\"cancel\">".get_lang('Cancel')."</button>"
        ."<button type='submit' name=\"submit_image\" value=\"".get_lang('Ok')."\" class=\"save\">".get_lang('Ok')."</button>"
        ."</form>";
    return $form;
}

/**
 * This recursive function can be used during the upgrade process form older
 * versions of Chamilo
 * It crawls the given directory, checks if the file is in the DB and adds
 * it if it's not
 *
 * @param array $courseInfo
 * @param array $userInfo
 * @param string $base_work_dir
 * @param string $folderPath
 * @param int $sessionId
 * @param int $groupId group.id
 * @param bool $output
 * @param array $parent
 * @param string $uploadPath
 *
 */
function add_all_documents_in_folder_to_database(
    $courseInfo,
    $userInfo,
    $base_work_dir,
    $folderPath,
    $sessionId = 0,
    $groupId = 0,
    $output = false,
    $parent = array()
) {
    if (empty($userInfo) || empty($courseInfo)) {

        return false;
    }

    $userId = $userInfo['user_id'];

    // Open dir
    $handle = opendir($folderPath);

    if (is_dir($folderPath)) {
        // Run trough
        while ($file = readdir($handle)) {

            if ($file == '.' || $file == '..') {
                continue;
            }

            $parentPath = null;

            if (!empty($parent) && isset($parent['path'])) {
                $parentPath = $parent['path'];
                if ($parentPath == '/') {
                    $parentPath = null;
                }
            }

            $completePath = $parentPath.'/'.$file;
            $sysFolderPath = $folderPath.'/'.$file;

            // Is directory?
            if (is_dir($sysFolderPath)) {

                $folderExists = DocumentManager::folderExists(
                    $completePath,
                    $courseInfo,
                    $sessionId,
                    $groupId
                );

                if ($folderExists === true) {
                    $documentId = DocumentManager::get_document_id($courseInfo, $completePath, $sessionId);
                    if ($documentId) {
                        $newFolderData = DocumentManager::get_document_data_by_id(
                            $documentId,
                            $courseInfo,
                            false,
                            $sessionId
                        );
                    }
                } else {
                    $newFolderData = create_unexisting_directory(
                        $courseInfo,
                        $userId,
                        $sessionId,
                        $groupId,
                        null,
                        $base_work_dir,
                        $completePath,
                        null,
                        null,
                        false
                    );
                }

                // Recursive
                add_all_documents_in_folder_to_database(
                    $courseInfo,
                    $userInfo,
                    $base_work_dir,
                    $sysFolderPath,
                    $sessionId,
                    $groupId,
                    $output,
                    $newFolderData
                );
            } else {
                // Rename
                $uploadedFile = array(
                    'name' => $file,
                    'tmp_name' => $sysFolderPath,
                    'size' => filesize($sysFolderPath),
                    'type' => null,
                    'from_file' => true,
                    'move_file' => true
                );

                handle_uploaded_document(
                    $courseInfo,
                    $uploadedFile,
                    $base_work_dir,
                    $parentPath,
                    $userId,
                    $groupId,
                    null,
                    0,
                    'overwrite',
                    $output,
                    false,
                    null,
                    $sessionId
                );
            }
        }
    }
}