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filelib.php
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filelib.php
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<?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/>.
/**
* Functions for file handling.
*
* @package core_files
* @copyright 1999 onwards Martin Dougiamas (http://dougiamas.com)
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* BYTESERVING_BOUNDARY - string unique string constant.
*/
define('BYTESERVING_BOUNDARY', 's1k2o3d4a5k6s7');
/**
* Unlimited area size constant
*/
define('FILE_AREA_MAX_BYTES_UNLIMITED', -1);
require_once("$CFG->libdir/filestorage/file_exceptions.php");
require_once("$CFG->libdir/filestorage/file_storage.php");
require_once("$CFG->libdir/filestorage/zip_packer.php");
require_once("$CFG->libdir/filebrowser/file_browser.php");
/**
* Encodes file serving url
*
* @deprecated use moodle_url factory methods instead
*
* @todo MDL-31071 deprecate this function
* @global stdClass $CFG
* @param string $urlbase
* @param string $path /filearea/itemid/dir/dir/file.exe
* @param bool $forcedownload
* @param bool $https https url required
* @return string encoded file url
*/
function file_encode_url($urlbase, $path, $forcedownload=false, $https=false) {
global $CFG;
//TODO: deprecate this
if ($CFG->slasharguments) {
$parts = explode('/', $path);
$parts = array_map('rawurlencode', $parts);
$path = implode('/', $parts);
$return = $urlbase.$path;
if ($forcedownload) {
$return .= '?forcedownload=1';
}
} else {
$path = rawurlencode($path);
$return = $urlbase.'?file='.$path;
if ($forcedownload) {
$return .= '&forcedownload=1';
}
}
if ($https) {
$return = str_replace('http://', 'https://', $return);
}
return $return;
}
/**
* Detects if area contains subdirs,
* this is intended for file areas that are attached to content
* migrated from 1.x where subdirs were allowed everywhere.
*
* @param context $context
* @param string $component
* @param string $filearea
* @param string $itemid
* @return bool
*/
function file_area_contains_subdirs(context $context, $component, $filearea, $itemid) {
global $DB;
if (!isset($itemid)) {
// Not initialised yet.
return false;
}
// Detect if any directories are already present, this is necessary for content upgraded from 1.x.
$select = "contextid = :contextid AND component = :component AND filearea = :filearea AND itemid = :itemid AND filepath <> '/' AND filename = '.'";
$params = array('contextid'=>$context->id, 'component'=>$component, 'filearea'=>$filearea, 'itemid'=>$itemid);
return $DB->record_exists_select('files', $select, $params);
}
/**
* Prepares 'editor' formslib element from data in database
*
* The passed $data record must contain field foobar, foobarformat and optionally foobartrust. This
* function then copies the embedded files into draft area (assigning itemids automatically),
* creates the form element foobar_editor and rewrites the URLs so the embedded images can be
* displayed.
* In your mform definition, you must have an 'editor' element called foobar_editor. Then you call
* your mform's set_data() supplying the object returned by this function.
*
* @category files
* @param stdClass $data database field that holds the html text with embedded media
* @param string $field the name of the database field that holds the html text with embedded media
* @param array $options editor options (like maxifiles, maxbytes etc.)
* @param stdClass $context context of the editor
* @param string $component
* @param string $filearea file area name
* @param int $itemid item id, required if item exists
* @return stdClass modified data object
*/
function file_prepare_standard_editor($data, $field, array $options, $context=null, $component=null, $filearea=null, $itemid=null) {
$options = (array)$options;
if (!isset($options['trusttext'])) {
$options['trusttext'] = false;
}
if (!isset($options['forcehttps'])) {
$options['forcehttps'] = false;
}
if (!isset($options['subdirs'])) {
$options['subdirs'] = false;
}
if (!isset($options['maxfiles'])) {
$options['maxfiles'] = 0; // no files by default
}
if (!isset($options['noclean'])) {
$options['noclean'] = false;
}
//sanity check for passed context. This function doesn't expect $option['context'] to be set
//But this function is called before creating editor hence, this is one of the best places to check
//if context is used properly. This check notify developer that they missed passing context to editor.
if (isset($context) && !isset($options['context'])) {
//if $context is not null then make sure $option['context'] is also set.
debugging('Context for editor is not set in editoroptions. Hence editor will not respect editor filters', DEBUG_DEVELOPER);
} else if (isset($options['context']) && isset($context)) {
//If both are passed then they should be equal.
if ($options['context']->id != $context->id) {
$exceptionmsg = 'Editor context ['.$options['context']->id.'] is not equal to passed context ['.$context->id.']';
throw new coding_exception($exceptionmsg);
}
}
if (is_null($itemid) or is_null($context)) {
$contextid = null;
$itemid = null;
if (!isset($data)) {
$data = new stdClass();
}
if (!isset($data->{$field})) {
$data->{$field} = '';
}
if (!isset($data->{$field.'format'})) {
$data->{$field.'format'} = editors_get_preferred_format();
}
if (!$options['noclean']) {
$data->{$field} = clean_text($data->{$field}, $data->{$field.'format'});
}
} else {
if ($options['trusttext']) {
// noclean ignored if trusttext enabled
if (!isset($data->{$field.'trust'})) {
$data->{$field.'trust'} = 0;
}
$data = trusttext_pre_edit($data, $field, $context);
} else {
if (!$options['noclean']) {
$data->{$field} = clean_text($data->{$field}, $data->{$field.'format'});
}
}
$contextid = $context->id;
}
if ($options['maxfiles'] != 0) {
$draftid_editor = file_get_submitted_draft_itemid($field);
$currenttext = file_prepare_draft_area($draftid_editor, $contextid, $component, $filearea, $itemid, $options, $data->{$field});
$data->{$field.'_editor'} = array('text'=>$currenttext, 'format'=>$data->{$field.'format'}, 'itemid'=>$draftid_editor);
} else {
$data->{$field.'_editor'} = array('text'=>$data->{$field}, 'format'=>$data->{$field.'format'}, 'itemid'=>0);
}
return $data;
}
/**
* Prepares the content of the 'editor' form element with embedded media files to be saved in database
*
* This function moves files from draft area to the destination area and
* encodes URLs to the draft files so they can be safely saved into DB. The
* form has to contain the 'editor' element named foobar_editor, where 'foobar'
* is the name of the database field to hold the wysiwyg editor content. The
* editor data comes as an array with text, format and itemid properties. This
* function automatically adds $data properties foobar, foobarformat and
* foobartrust, where foobar has URL to embedded files encoded.
*
* @category files
* @param stdClass $data raw data submitted by the form
* @param string $field name of the database field containing the html with embedded media files
* @param array $options editor options (trusttext, subdirs, maxfiles, maxbytes etc.)
* @param stdClass $context context, required for existing data
* @param string $component file component
* @param string $filearea file area name
* @param int $itemid item id, required if item exists
* @return stdClass modified data object
*/
function file_postupdate_standard_editor($data, $field, array $options, $context, $component=null, $filearea=null, $itemid=null) {
$options = (array)$options;
if (!isset($options['trusttext'])) {
$options['trusttext'] = false;
}
if (!isset($options['forcehttps'])) {
$options['forcehttps'] = false;
}
if (!isset($options['subdirs'])) {
$options['subdirs'] = false;
}
if (!isset($options['maxfiles'])) {
$options['maxfiles'] = 0; // no files by default
}
if (!isset($options['maxbytes'])) {
$options['maxbytes'] = 0; // unlimited
}
if ($options['trusttext']) {
$data->{$field.'trust'} = trusttext_trusted($context);
} else {
$data->{$field.'trust'} = 0;
}
$editor = $data->{$field.'_editor'};
if ($options['maxfiles'] == 0 or is_null($filearea) or is_null($itemid) or empty($editor['itemid'])) {
$data->{$field} = $editor['text'];
} else {
$data->{$field} = file_save_draft_area_files($editor['itemid'], $context->id, $component, $filearea, $itemid, $options, $editor['text'], $options['forcehttps']);
}
$data->{$field.'format'} = $editor['format'];
return $data;
}
/**
* Saves text and files modified by Editor formslib element
*
* @category files
* @param stdClass $data $database entry field
* @param string $field name of data field
* @param array $options various options
* @param stdClass $context context - must already exist
* @param string $component
* @param string $filearea file area name
* @param int $itemid must already exist, usually means data is in db
* @return stdClass modified data obejct
*/
function file_prepare_standard_filemanager($data, $field, array $options, $context=null, $component=null, $filearea=null, $itemid=null) {
$options = (array)$options;
if (!isset($options['subdirs'])) {
$options['subdirs'] = false;
}
if (is_null($itemid) or is_null($context)) {
$itemid = null;
$contextid = null;
} else {
$contextid = $context->id;
}
$draftid_editor = file_get_submitted_draft_itemid($field.'_filemanager');
file_prepare_draft_area($draftid_editor, $contextid, $component, $filearea, $itemid, $options);
$data->{$field.'_filemanager'} = $draftid_editor;
return $data;
}
/**
* Saves files modified by File manager formslib element
*
* @todo MDL-31073 review this function
* @category files
* @param stdClass $data $database entry field
* @param string $field name of data field
* @param array $options various options
* @param stdClass $context context - must already exist
* @param string $component
* @param string $filearea file area name
* @param int $itemid must already exist, usually means data is in db
* @return stdClass modified data obejct
*/
function file_postupdate_standard_filemanager($data, $field, array $options, $context, $component, $filearea, $itemid) {
$options = (array)$options;
if (!isset($options['subdirs'])) {
$options['subdirs'] = false;
}
if (!isset($options['maxfiles'])) {
$options['maxfiles'] = -1; // unlimited
}
if (!isset($options['maxbytes'])) {
$options['maxbytes'] = 0; // unlimited
}
if (empty($data->{$field.'_filemanager'})) {
$data->$field = '';
} else {
file_save_draft_area_files($data->{$field.'_filemanager'}, $context->id, $component, $filearea, $itemid, $options);
$fs = get_file_storage();
if ($fs->get_area_files($context->id, $component, $filearea, $itemid)) {
$data->$field = '1'; // TODO: this is an ugly hack (skodak)
} else {
$data->$field = '';
}
}
return $data;
}
/**
* Generate a draft itemid
*
* @category files
* @global moodle_database $DB
* @global stdClass $USER
* @return int a random but available draft itemid that can be used to create a new draft
* file area.
*/
function file_get_unused_draft_itemid() {
global $DB, $USER;
if (isguestuser() or !isloggedin()) {
// guests and not-logged-in users can not be allowed to upload anything!!!!!!
print_error('noguest');
}
$contextid = context_user::instance($USER->id)->id;
$fs = get_file_storage();
$draftitemid = rand(1, 999999999);
while ($files = $fs->get_area_files($contextid, 'user', 'draft', $draftitemid)) {
$draftitemid = rand(1, 999999999);
}
return $draftitemid;
}
/**
* Initialise a draft file area from a real one by copying the files. A draft
* area will be created if one does not already exist. Normally you should
* get $draftitemid by calling file_get_submitted_draft_itemid('elementname');
*
* @category files
* @global stdClass $CFG
* @global stdClass $USER
* @param int $draftitemid the id of the draft area to use, or 0 to create a new one, in which case this parameter is updated.
* @param int $contextid This parameter and the next two identify the file area to copy files from.
* @param string $component
* @param string $filearea helps indentify the file area.
* @param int $itemid helps identify the file area. Can be null if there are no files yet.
* @param array $options text and file options ('subdirs'=>false, 'forcehttps'=>false)
* @param string $text some html content that needs to have embedded links rewritten to point to the draft area.
* @return string|null returns string if $text was passed in, the rewritten $text is returned. Otherwise NULL.
*/
function file_prepare_draft_area(&$draftitemid, $contextid, $component, $filearea, $itemid, array $options=null, $text=null) {
global $CFG, $USER, $CFG;
$options = (array)$options;
if (!isset($options['subdirs'])) {
$options['subdirs'] = false;
}
if (!isset($options['forcehttps'])) {
$options['forcehttps'] = false;
}
$usercontext = context_user::instance($USER->id);
$fs = get_file_storage();
if (empty($draftitemid)) {
// create a new area and copy existing files into
$draftitemid = file_get_unused_draft_itemid();
$file_record = array('contextid'=>$usercontext->id, 'component'=>'user', 'filearea'=>'draft', 'itemid'=>$draftitemid);
if (!is_null($itemid) and $files = $fs->get_area_files($contextid, $component, $filearea, $itemid)) {
foreach ($files as $file) {
if ($file->is_directory() and $file->get_filepath() === '/') {
// we need a way to mark the age of each draft area,
// by not copying the root dir we force it to be created automatically with current timestamp
continue;
}
if (!$options['subdirs'] and ($file->is_directory() or $file->get_filepath() !== '/')) {
continue;
}
$draftfile = $fs->create_file_from_storedfile($file_record, $file);
// XXX: This is a hack for file manager (MDL-28666)
// File manager needs to know the original file information before copying
// to draft area, so we append these information in mdl_files.source field
// {@link file_storage::search_references()}
// {@link file_storage::search_references_count()}
$sourcefield = $file->get_source();
$newsourcefield = new stdClass;
$newsourcefield->source = $sourcefield;
$original = new stdClass;
$original->contextid = $contextid;
$original->component = $component;
$original->filearea = $filearea;
$original->itemid = $itemid;
$original->filename = $file->get_filename();
$original->filepath = $file->get_filepath();
$newsourcefield->original = file_storage::pack_reference($original);
$draftfile->set_source(serialize($newsourcefield));
// End of file manager hack
}
}
if (!is_null($text)) {
// at this point there should not be any draftfile links yet,
// because this is a new text from database that should still contain the @@pluginfile@@ links
// this happens when developers forget to post process the text
$text = str_replace("\"$CFG->httpswwwroot/draftfile.php", "\"$CFG->httpswwwroot/brokenfile.php#", $text);
}
} else {
// nothing to do
}
if (is_null($text)) {
return null;
}
// relink embedded files - editor can not handle @@PLUGINFILE@@ !
return file_rewrite_pluginfile_urls($text, 'draftfile.php', $usercontext->id, 'user', 'draft', $draftitemid, $options);
}
/**
* Convert encoded URLs in $text from the @@PLUGINFILE@@/... form to an actual URL.
*
* @category files
* @global stdClass $CFG
* @param string $text The content that may contain ULRs in need of rewriting.
* @param string $file The script that should be used to serve these files. pluginfile.php, draftfile.php, etc.
* @param int $contextid This parameter and the next two identify the file area to use.
* @param string $component
* @param string $filearea helps identify the file area.
* @param int $itemid helps identify the file area.
* @param array $options text and file options ('forcehttps'=>false)
* @return string the processed text.
*/
function file_rewrite_pluginfile_urls($text, $file, $contextid, $component, $filearea, $itemid, array $options=null) {
global $CFG;
$options = (array)$options;
if (!isset($options['forcehttps'])) {
$options['forcehttps'] = false;
}
if (!$CFG->slasharguments) {
$file = $file . '?file=';
}
$baseurl = "$CFG->wwwroot/$file/$contextid/$component/$filearea/";
if ($itemid !== null) {
$baseurl .= "$itemid/";
}
if ($options['forcehttps']) {
$baseurl = str_replace('http://', 'https://', $baseurl);
}
return str_replace('@@PLUGINFILE@@/', $baseurl, $text);
}
/**
* Returns information about files in a draft area.
*
* @global stdClass $CFG
* @global stdClass $USER
* @param int $draftitemid the draft area item id.
* @param string $filepath path to the directory from which the information have to be retrieved.
* @return array with the following entries:
* 'filecount' => number of files in the draft area.
* 'filesize' => total size of the files in the draft area.
* 'foldercount' => number of folders in the draft area.
* 'filesize_without_references' => total size of the area excluding file references.
* (more information will be added as needed).
*/
function file_get_draft_area_info($draftitemid, $filepath = '/') {
global $CFG, $USER;
$usercontext = context_user::instance($USER->id);
$fs = get_file_storage();
$results = array(
'filecount' => 0,
'foldercount' => 0,
'filesize' => 0,
'filesize_without_references' => 0
);
if ($filepath != '/') {
$draftfiles = $fs->get_directory_files($usercontext->id, 'user', 'draft', $draftitemid, $filepath, true, true);
} else {
$draftfiles = $fs->get_area_files($usercontext->id, 'user', 'draft', $draftitemid, 'id', true);
}
foreach ($draftfiles as $file) {
if ($file->is_directory()) {
$results['foldercount'] += 1;
} else {
$results['filecount'] += 1;
}
$filesize = $file->get_filesize();
$results['filesize'] += $filesize;
if (!$file->is_external_file()) {
$results['filesize_without_references'] += $filesize;
}
}
return $results;
}
/**
* Returns whether a draft area has exceeded/will exceed its size limit.
*
* Please note that the unlimited value for $areamaxbytes is -1 {@link FILE_AREA_MAX_BYTES_UNLIMITED}, not 0.
*
* @param int $draftitemid the draft area item id.
* @param int $areamaxbytes the maximum size allowed in this draft area.
* @param int $newfilesize the size that would be added to the current area.
* @param bool $includereferences true to include the size of the references in the area size.
* @return bool true if the area will/has exceeded its limit.
* @since 2.4
*/
function file_is_draft_area_limit_reached($draftitemid, $areamaxbytes, $newfilesize = 0, $includereferences = false) {
if ($areamaxbytes != FILE_AREA_MAX_BYTES_UNLIMITED) {
$draftinfo = file_get_draft_area_info($draftitemid);
$areasize = $draftinfo['filesize_without_references'];
if ($includereferences) {
$areasize = $draftinfo['filesize'];
}
if ($areasize + $newfilesize > $areamaxbytes) {
return true;
}
}
return false;
}
/**
* Get used space of files
* @global moodle_database $DB
* @global stdClass $USER
* @return int total bytes
*/
function file_get_user_used_space() {
global $DB, $USER;
$usercontext = context_user::instance($USER->id);
$sql = "SELECT SUM(files1.filesize) AS totalbytes FROM {files} files1
JOIN (SELECT contenthash, filename, MAX(id) AS id
FROM {files}
WHERE contextid = ? AND component = ? AND filearea != ?
GROUP BY contenthash, filename) files2 ON files1.id = files2.id";
$params = array('contextid'=>$usercontext->id, 'component'=>'user', 'filearea'=>'draft');
$record = $DB->get_record_sql($sql, $params);
return (int)$record->totalbytes;
}
/**
* Convert any string to a valid filepath
* @todo review this function
* @param string $str
* @return string path
*/
function file_correct_filepath($str) { //TODO: what is this? (skodak) - No idea (Fred)
if ($str == '/' or empty($str)) {
return '/';
} else {
return '/'.trim($str, '/').'/';
}
}
/**
* Generate a folder tree of draft area of current USER recursively
*
* @todo MDL-31073 use normal return value instead, this does not fit the rest of api here (skodak)
* @param int $draftitemid
* @param string $filepath
* @param mixed $data
*/
function file_get_drafarea_folders($draftitemid, $filepath, &$data) {
global $USER, $OUTPUT, $CFG;
$data->children = array();
$context = context_user::instance($USER->id);
$fs = get_file_storage();
if ($files = $fs->get_directory_files($context->id, 'user', 'draft', $draftitemid, $filepath, false)) {
foreach ($files as $file) {
if ($file->is_directory()) {
$item = new stdClass();
$item->sortorder = $file->get_sortorder();
$item->filepath = $file->get_filepath();
$foldername = explode('/', trim($item->filepath, '/'));
$item->fullname = trim(array_pop($foldername), '/');
$item->id = uniqid();
file_get_drafarea_folders($draftitemid, $item->filepath, $item);
$data->children[] = $item;
} else {
continue;
}
}
}
}
/**
* Listing all files (including folders) in current path (draft area)
* used by file manager
* @param int $draftitemid
* @param string $filepath
* @return stdClass
*/
function file_get_drafarea_files($draftitemid, $filepath = '/') {
global $USER, $OUTPUT, $CFG;
$context = context_user::instance($USER->id);
$fs = get_file_storage();
$data = new stdClass();
$data->path = array();
$data->path[] = array('name'=>get_string('files'), 'path'=>'/');
// will be used to build breadcrumb
$trail = '/';
if ($filepath !== '/') {
$filepath = file_correct_filepath($filepath);
$parts = explode('/', $filepath);
foreach ($parts as $part) {
if ($part != '' && $part != null) {
$trail .= ($part.'/');
$data->path[] = array('name'=>$part, 'path'=>$trail);
}
}
}
$list = array();
$maxlength = 12;
if ($files = $fs->get_directory_files($context->id, 'user', 'draft', $draftitemid, $filepath, false)) {
foreach ($files as $file) {
$item = new stdClass();
$item->filename = $file->get_filename();
$item->filepath = $file->get_filepath();
$item->fullname = trim($item->filename, '/');
$filesize = $file->get_filesize();
$item->size = $filesize ? $filesize : null;
$item->filesize = $filesize ? display_size($filesize) : '';
$item->sortorder = $file->get_sortorder();
$item->author = $file->get_author();
$item->license = $file->get_license();
$item->datemodified = $file->get_timemodified();
$item->datecreated = $file->get_timecreated();
$item->isref = $file->is_external_file();
if ($item->isref && $file->get_status() == 666) {
$item->originalmissing = true;
}
// find the file this draft file was created from and count all references in local
// system pointing to that file
$source = @unserialize($file->get_source());
if (isset($source->original)) {
$item->refcount = $fs->search_references_count($source->original);
}
if ($file->is_directory()) {
$item->filesize = 0;
$item->icon = $OUTPUT->pix_url(file_folder_icon(24))->out(false);
$item->type = 'folder';
$foldername = explode('/', trim($item->filepath, '/'));
$item->fullname = trim(array_pop($foldername), '/');
$item->thumbnail = $OUTPUT->pix_url(file_folder_icon(90))->out(false);
} else {
// do NOT use file browser here!
$item->mimetype = get_mimetype_description($file);
if (file_extension_in_typegroup($file->get_filename(), 'archive')) {
$item->type = 'zip';
} else {
$item->type = 'file';
}
$itemurl = moodle_url::make_draftfile_url($draftitemid, $item->filepath, $item->filename);
$item->url = $itemurl->out();
$item->icon = $OUTPUT->pix_url(file_file_icon($file, 24))->out(false);
$item->thumbnail = $OUTPUT->pix_url(file_file_icon($file, 90))->out(false);
if ($imageinfo = $file->get_imageinfo()) {
$item->realthumbnail = $itemurl->out(false, array('preview' => 'thumb', 'oid' => $file->get_timemodified()));
$item->realicon = $itemurl->out(false, array('preview' => 'tinyicon', 'oid' => $file->get_timemodified()));
$item->image_width = $imageinfo['width'];
$item->image_height = $imageinfo['height'];
}
}
$list[] = $item;
}
}
$data->itemid = $draftitemid;
$data->list = $list;
return $data;
}
/**
* Returns draft area itemid for a given element.
*
* @category files
* @param string $elname name of formlib editor element, or a hidden form field that stores the draft area item id, etc.
* @return int the itemid, or 0 if there is not one yet.
*/
function file_get_submitted_draft_itemid($elname) {
// this is a nasty hack, ideally all new elements should use arrays here or there should be a new parameter
if (!isset($_REQUEST[$elname])) {
return 0;
}
if (is_array($_REQUEST[$elname])) {
$param = optional_param_array($elname, 0, PARAM_INT);
if (!empty($param['itemid'])) {
$param = $param['itemid'];
} else {
debugging('Missing itemid, maybe caused by unset maxfiles option', DEBUG_DEVELOPER);
return false;
}
} else {
$param = optional_param($elname, 0, PARAM_INT);
}
if ($param) {
require_sesskey();
}
return $param;
}
/**
* Restore the original source field from draft files
*
* Do not use this function because it makes field files.source inconsistent
* for draft area files. This function will be deprecated in 2.6
*
* @param stored_file $storedfile This only works with draft files
* @return stored_file
*/
function file_restore_source_field_from_draft_file($storedfile) {
$source = @unserialize($storedfile->get_source());
if (!empty($source)) {
if (is_object($source)) {
$restoredsource = $source->source;
$storedfile->set_source($restoredsource);
} else {
throw new moodle_exception('invalidsourcefield', 'error');
}
}
return $storedfile;
}
/**
* Saves files from a draft file area to a real one (merging the list of files).
* Can rewrite URLs in some content at the same time if desired.
*
* @category files
* @global stdClass $USER
* @param int $draftitemid the id of the draft area to use. Normally obtained
* from file_get_submitted_draft_itemid('elementname') or similar.
* @param int $contextid This parameter and the next two identify the file area to save to.
* @param string $component
* @param string $filearea indentifies the file area.
* @param int $itemid helps identifies the file area.
* @param array $options area options (subdirs=>false, maxfiles=-1, maxbytes=0)
* @param string $text some html content that needs to have embedded links rewritten
* to the @@PLUGINFILE@@ form for saving in the database.
* @param bool $forcehttps force https urls.
* @return string|null if $text was passed in, the rewritten $text is returned. Otherwise NULL.
*/
function file_save_draft_area_files($draftitemid, $contextid, $component, $filearea, $itemid, array $options=null, $text=null, $forcehttps=false) {
global $USER;
$usercontext = context_user::instance($USER->id);
$fs = get_file_storage();
$options = (array)$options;
if (!isset($options['subdirs'])) {
$options['subdirs'] = false;
}
if (!isset($options['maxfiles'])) {
$options['maxfiles'] = -1; // unlimited
}
if (!isset($options['maxbytes']) || $options['maxbytes'] == USER_CAN_IGNORE_FILE_SIZE_LIMITS) {
$options['maxbytes'] = 0; // unlimited
}
if (!isset($options['areamaxbytes'])) {
$options['areamaxbytes'] = FILE_AREA_MAX_BYTES_UNLIMITED; // Unlimited.
}
$allowreferences = true;
if (isset($options['return_types']) && !($options['return_types'] & FILE_REFERENCE)) {
// we assume that if $options['return_types'] is NOT specified, we DO allow references.
// this is not exactly right. BUT there are many places in code where filemanager options
// are not passed to file_save_draft_area_files()
$allowreferences = false;
}
// Check if the draft area has exceeded the authorised limit. This should never happen as validation
// should have taken place before, unless the user is doing something nauthly. If so, let's just not save
// anything at all in the next area.
if (file_is_draft_area_limit_reached($draftitemid, $options['areamaxbytes'])) {
return null;
}
$draftfiles = $fs->get_area_files($usercontext->id, 'user', 'draft', $draftitemid, 'id');
$oldfiles = $fs->get_area_files($contextid, $component, $filearea, $itemid, 'id');
// One file in filearea means it is empty (it has only top-level directory '.').
if (count($draftfiles) > 1 || count($oldfiles) > 1) {
// we have to merge old and new files - we want to keep file ids for files that were not changed
// we change time modified for all new and changed files, we keep time created as is
$newhashes = array();
$filecount = 0;
foreach ($draftfiles as $file) {
if (!$options['subdirs'] && $file->get_filepath() !== '/') {
continue;
}
if (!$allowreferences && $file->is_external_file()) {
continue;
}
if (!$file->is_directory()) {
if ($options['maxbytes'] and $options['maxbytes'] < $file->get_filesize()) {
// oversized file - should not get here at all
continue;
}
if ($options['maxfiles'] != -1 and $options['maxfiles'] <= $filecount) {
// more files - should not get here at all
continue;
}
$filecount++;
}
$newhash = $fs->get_pathname_hash($contextid, $component, $filearea, $itemid, $file->get_filepath(), $file->get_filename());
$newhashes[$newhash] = $file;
}
// Loop through oldfiles and decide which we need to delete and which to update.
// After this cycle the array $newhashes will only contain the files that need to be added.
foreach ($oldfiles as $oldfile) {
$oldhash = $oldfile->get_pathnamehash();
if (!isset($newhashes[$oldhash])) {
// delete files not needed any more - deleted by user
$oldfile->delete();
continue;
}
$newfile = $newhashes[$oldhash];
// Now we know that we have $oldfile and $newfile for the same path.
// Let's check if we can update this file or we need to delete and create.
if ($newfile->is_directory()) {
// Directories are always ok to just update.
} else if (($source = @unserialize($newfile->get_source())) && isset($source->original)) {
// File has the 'original' - we need to update the file (it may even have not been changed at all).
$original = file_storage::unpack_reference($source->original);
if ($original['filename'] !== $oldfile->get_filename() || $original['filepath'] !== $oldfile->get_filepath()) {
// Very odd, original points to another file. Delete and create file.
$oldfile->delete();
continue;
}
} else {
// The same file name but absence of 'original' means that file was deteled and uploaded again.
// By deleting and creating new file we properly manage all existing references.
$oldfile->delete();
continue;
}
// status changed, we delete old file, and create a new one
if ($oldfile->get_status() != $newfile->get_status()) {
// file was changed, use updated with new timemodified data
$oldfile->delete();
// This file will be added later
continue;
}
// Updated author
if ($oldfile->get_author() != $newfile->get_author()) {
$oldfile->set_author($newfile->get_author());
}
// Updated license
if ($oldfile->get_license() != $newfile->get_license()) {
$oldfile->set_license($newfile->get_license());
}
// Updated file source
// Field files.source for draftarea files contains serialised object with source and original information.
// We only store the source part of it for non-draft file area.
$newsource = $newfile->get_source();
if ($source = @unserialize($newfile->get_source())) {
$newsource = $source->source;
}
if ($oldfile->get_source() !== $newsource) {
$oldfile->set_source($newsource);
}
// Updated sort order
if ($oldfile->get_sortorder() != $newfile->get_sortorder()) {
$oldfile->set_sortorder($newfile->get_sortorder());
}
// Update file timemodified
if ($oldfile->get_timemodified() != $newfile->get_timemodified()) {
$oldfile->set_timemodified($newfile->get_timemodified());
}
// Replaced file content
if (!$oldfile->is_directory() &&
($oldfile->get_contenthash() != $newfile->get_contenthash() ||
$oldfile->get_filesize() != $newfile->get_filesize() ||
$oldfile->get_referencefileid() != $newfile->get_referencefileid() ||
$oldfile->get_userid() != $newfile->get_userid())) {
$oldfile->replace_file_with($newfile);
}
// unchanged file or directory - we keep it as is
unset($newhashes[$oldhash]);
}
// Add fresh file or the file which has changed status
// the size and subdirectory tests are extra safety only, the UI should prevent it
foreach ($newhashes as $file) {
$file_record = array('contextid'=>$contextid, 'component'=>$component, 'filearea'=>$filearea, 'itemid'=>$itemid, 'timemodified'=>time());
if ($source = @unserialize($file->get_source())) {
// Field files.source for draftarea files contains serialised object with source and original information.
// We only store the source part of it for non-draft file area.
$file_record['source'] = $source->source;
}
if ($file->is_external_file()) {
$repoid = $file->get_repository_id();
if (!empty($repoid)) {
$file_record['repositoryid'] = $repoid;
$file_record['reference'] = $file->get_reference();
}
}
$fs->create_file_from_storedfile($file_record, $file);
}
}
// note: do not purge the draft area - we clean up areas later in cron,
// the reason is that user might press submit twice and they would loose the files,
// also sometimes we might want to use hacks that save files into two different areas
if (is_null($text)) {
return null;
} else {
return file_rewrite_urls_to_pluginfile($text, $draftitemid, $forcehttps);
}
}
/**
* Convert the draft file area URLs in some content to @@PLUGINFILE@@ tokens
* ready to be saved in the database. Normally, this is done automatically by
* {@link file_save_draft_area_files()}.
*
* @category files
* @param string $text the content to process.
* @param int $draftitemid the draft file area the content was using.
* @param bool $forcehttps whether the content contains https URLs. Default false.
* @return string the processed content.
*/
function file_rewrite_urls_to_pluginfile($text, $draftitemid, $forcehttps = false) {
global $CFG, $USER;
$usercontext = context_user::instance($USER->id);
$wwwroot = $CFG->wwwroot;
if ($forcehttps) {
$wwwroot = str_replace('http://', 'https://', $wwwroot);
}
// relink embedded files if text submitted - no absolute links allowed in database!
$text = str_ireplace("$wwwroot/draftfile.php/$usercontext->id/user/draft/$draftitemid/", '@@PLUGINFILE@@/', $text);
if (strpos($text, 'draftfile.php?file=') !== false) {
$matches = array();
preg_match_all("!$wwwroot/draftfile.php\?file=%2F{$usercontext->id}%2Fuser%2Fdraft%2F{$draftitemid}%2F[^'\",&<>|`\s:\\\\]+!iu", $text, $matches);
if ($matches) {
foreach ($matches[0] as $match) {
$replace = str_ireplace('%2F', '/', $match);
$text = str_replace($match, $replace, $text);