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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
* @subpackage file
* @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();
/** @var string unique string constant. */
define('BYTESERVING_BOUNDARY', 's1k2o3d4a5k6s7');
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
*
* @global object
* @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;
}
/**
* 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.
*
* @param object $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 object $context context of the editor
* @param string $component
* @param string $filearea file area name
* @param int $itemid item id, required if item exists
* @return object modified data object
*/
function file_prepare_standard_editor($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'])) {
$options['noclean'] = false;
}
if (is_null($itemid) or is_null($context)) {
$contextid = null;
$itemid = null;
if (!isset($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.
*
* @param object $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 object $context context, required for existing data
* @param string component
* @param string $filearea file area name
* @param int $itemid item id, required if item exists
* @return object modified data object
*/
function file_postupdate_standard_editor($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
*
* @param object $data $database entry field
* @param string $field name of data field
* @param array $options various options
* @param object $context context - must already exist
* @param string $component
* @param string $filearea file area name
* @param int $itemid must already exist, usually means data is in db
* @return object modified data obejct
*/
function file_prepare_standard_filemanager($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
*
* @param object $data $database entry field
* @param string $field name of data field
* @param array $options various options
* @param object $context context - must already exist
* @param string $component
* @param string $filearea file area name
* @param int $itemid must already exist, usually means data is in db
* @return object modified data obejct
*/
function file_postupdate_standard_filemanager($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;
}
/**
*
* @global object
* @global object
* @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 = get_context_instance(CONTEXT_USER, $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 $draftitemid by calling file_get_submitted_draft_itemid('elementname');
*
* @global object
* @global object
* @param int &$draftitemid the id of the draft area to use, or 0 to create a new one, in which case this parameter is updated.
* @param integer $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 integer $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 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;
$options = (array)$options;
if (!isset($options['subdirs'])) {
$options['subdirs'] = false;
}
if (!isset($options['forcehttps'])) {
$options['forcehttps'] = false;
}
$usercontext = get_context_instance(CONTEXT_USER, $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;
}
$fs->create_file_from_storedfile($file_record, $file);
}
}
} else {
// nothing to do
}
if (is_null($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.
*
* @global object
* @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 integer $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 integer $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 object
* @global object
* @param integer $draftitemid the draft area item id.
* @return array with the following entries:
* 'filecount' => number of files in the draft area.
* (more information will be added as needed).
*/
function file_get_draft_area_info($draftitemid) {
global $CFG, $USER;
$usercontext = get_context_instance(CONTEXT_USER, $USER->id);
$fs = get_file_storage();
$results = array();
// The number of files
$draftfiles = $fs->get_area_files($usercontext->id, 'user', 'draft', $draftitemid, 'id', false);
$results['filecount'] = count($draftfiles);
$results['filesize'] = 0;
foreach ($draftfiles as $file) {
$results['filesize'] += $file->get_filesize();
}
return $results;
}
/**
* Get used space of files
* @return int total bytes
*/
function file_get_user_used_space() {
global $DB, $USER;
$usercontext = get_context_instance(CONTEXT_USER, $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
* @param string $str
* @return string path
*/
function file_correct_filepath($str) { //TODO: what is this? (skodak)
if ($str == '/' or empty($str)) {
return '/';
} else {
return '/'.trim($str, './@#$ ').'/';
}
}
/**
* Generate a folder tree of draft area of current USER recursively
* @param int $itemid
* @param string $filepath
* @param mixed $data //TODO: use normal return value instead, this does not fit the rest of api here (skodak)
*/
function file_get_drafarea_folders($draftitemid, $filepath, &$data) {
global $USER, $OUTPUT, $CFG;
$data->children = array();
$context = get_context_instance(CONTEXT_USER, $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 $filepath
* @return mixed
*/
function file_get_drafarea_files($draftitemid, $filepath = '/') {
global $USER, $OUTPUT, $CFG;
$context = get_context_instance(CONTEXT_USER, $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->filesize = $filesize ? display_size($filesize) : '';
$icon = mimeinfo_from_type('icon', $file->get_mimetype());
$item->icon = $OUTPUT->pix_url('f/' . $icon)->out();
$item->sortorder = $file->get_sortorder();
if ($icon == 'zip') {
$item->type = 'zip';
} else {
$item->type = 'file';
}
if ($file->is_directory()) {
$item->filesize = 0;
$item->icon = $OUTPUT->pix_url('f/folder')->out();
$item->type = 'folder';
$foldername = explode('/', trim($item->filepath, '/'));
$item->fullname = trim(array_pop($foldername), '/');
} else {
// do NOT use file browser here!
$item->url = moodle_url::make_draftfile_url($draftitemid, $item->filepath, $item->filename)->out();
}
$list[] = $item;
}
}
$data->itemid = $draftitemid;
$data->list = $list;
return $data;
}
/**
* Returns draft area itemid for a given element.
*
* @param string $elname name of formlib editor element, or a hidden form field that stores the draft area item id, etc.
* @return integer the itemid, or 0 if there is not one yet.
*/
function file_get_submitted_draft_itemid($elname) {
$param = optional_param($elname, 0, PARAM_INT);
if ($param) {
require_sesskey();
}
if (is_array($param)) {
if (!empty($param['itemid'])) {
$param = $param['itemid'];
} else {
debugging('Missing itemid, maybe caused by unset maxfiles option', DEBUG_DEVELOPER);
return false;
}
}
return $param;
}
/**
* 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.
*
* @global object
* @global object
* @param integer $draftitemid the id of the draft area to use. Normally obtained
* from file_get_submitted_draft_itemid('elementname') or similar.
* @param integer $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 integer $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 boolean $forcehttps force https urls.
* @return string 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 $CFG, $USER;
$usercontext = get_context_instance(CONTEXT_USER, $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'] = 0; // unlimited
}
$draftfiles = $fs->get_area_files($usercontext->id, 'user', 'draft', $draftitemid, 'id');
$oldfiles = $fs->get_area_files($contextid, $component, $filearea, $itemid, 'id');
if (count($draftfiles) < 2) {
// means there are no files - one file means root dir only ;-)
$fs->delete_area_files($contextid, $component, $filearea, $itemid);
} else if (count($oldfiles) < 2) {
$filecount = 0;
// there were no files before - one file means root dir only ;-)
$file_record = array('contextid'=>$contextid, 'component'=>$component, 'filearea'=>$filearea, 'itemid'=>$itemid);
foreach ($draftfiles as $file) {
if (!$options['subdirs']) {
if ($file->get_filepath() !== '/' or $file->is_directory()) {
continue;
}
}
if ($options['maxbytes'] and $options['maxbytes'] < $file->get_filesize()) {
// oversized file - should not get here at all
continue;
}
if ($options['maxfiles'] != -1 and $options['maxfiles'] <= $filecount) {
// more files - should not get here at all
break;
}
if (!$file->is_directory()) {
$filecount++;
}
$fs->create_file_from_storedfile($file_record, $file);
}
} else {
// 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
$file_record = array('contextid'=>$contextid, 'component'=>$component, 'filearea'=>$filearea, 'itemid'=>$itemid, 'timemodified'=>time());
$newhashes = array();
foreach ($draftfiles as $file) {
$newhash = $fs->get_pathname_hash($contextid, $component, $filearea, $itemid, $file->get_filepath(), $file->get_filename());
$newhashes[$newhash] = $file;
}
$filecount = 0;
foreach ($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];
if ($oldfile->get_contenthash() != $newfile->get_contenthash() or $oldfile->get_sortorder() != $newfile->get_sortorder()
or $oldfile->get_status() != $newfile->get_status() or $oldfile->get_license() != $newfile->get_license()
or $oldfile->get_author() != $newfile->get_author() or $oldfile->get_source() != $newfile->get_source()) {
// file was changed, use updated with new timemodified data
$oldfile->delete();
continue;
}
// unchanged file or directory - we keep it as is
unset($newhashes[$oldhash]);
if (!$oldfile->is_directory()) {
$filecount++;
}
}
// now add new/changed files
// the size and subdirectory tests are extra safety only, the UI should prevent it
foreach ($newhashes as $file) {
if (!$options['subdirs']) {
if ($file->get_filepath() !== '/' or $file->is_directory()) {
continue;
}
}
if ($options['maxbytes'] and $options['maxbytes'] < $file->get_filesize()) {
// oversized file - should not get here at all
continue;
}
if ($options['maxfiles'] != -1 and $options['maxfiles'] <= $filecount) {
// more files - should not get here at all
break;
}
if (!$file->is_directory()) {
$filecount++;
}
$fs->create_file_from_storedfile($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;
}
// relink embedded files if text submitted - no absolute links allowed in database!
if ($CFG->slasharguments) {
$draftbase = "$CFG->wwwroot/draftfile.php/$usercontext->id/user/draft/$draftitemid/";
} else {
$draftbase = "$CFG->wwwroot/draftfile.php?file=/$usercontext->id/user/draft/$draftitemid/";
}
if ($forcehttps) {
$draftbase = str_replace('http://', 'https://', $draftbase);
}
$text = str_ireplace($draftbase, '@@PLUGINFILE@@/', $text);
return $text;
}
/**
* Set file sort order
* @global object $DB
* @param integer $contextid the context id
* @param string $component
* @param string $filearea file area.
* @param integer $itemid itemid.
* @param string $filepath file path.
* @param string $filename file name.
* @param integer $sortorer the sort order of file.
* @return boolean
*/
function file_set_sortorder($contextid, $component, $filearea, $itemid, $filepath, $filename, $sortorder) {
global $DB;
$conditions = array('contextid'=>$contextid, 'component'=>$component, 'filearea'=>$filearea, 'itemid'=>$itemid, 'filepath'=>$filepath, 'filename'=>$filename);
if ($file_record = $DB->get_record('files', $conditions)) {
$sortorder = (int)$sortorder;
$file_record->sortorder = $sortorder;
$DB->update_record('files', $file_record);
return true;
}
return false;
}
/**
* reset file sort order number to 0
* @global object $DB
* @param integer $contextid the context id
* @param string $component
* @param string $filearea file area.
* @param integer $itemid itemid.
* @return boolean
*/
function file_reset_sortorder($contextid, $component, $filearea, $itemid=false) {
global $DB;
$conditions = array('contextid'=>$contextid, 'component'=>$component, 'filearea'=>$filearea);
if ($itemid !== false) {
$conditions['itemid'] = $itemid;
}
$file_records = $DB->get_records('files', $conditions);
foreach ($file_records as $file_record) {
$file_record->sortorder = 0;
$DB->update_record('files', $file_record);
}
return true;
}
/**
* Returns description of upload error
*
* @param int $errorcode found in $_FILES['filename.ext']['error']
* @return string error description string, '' if ok
*/
function file_get_upload_error($errorcode) {
switch ($errorcode) {
case 0: // UPLOAD_ERR_OK - no error
$errmessage = '';
break;
case 1: // UPLOAD_ERR_INI_SIZE
$errmessage = get_string('uploadserverlimit');
break;
case 2: // UPLOAD_ERR_FORM_SIZE
$errmessage = get_string('uploadformlimit');
break;
case 3: // UPLOAD_ERR_PARTIAL
$errmessage = get_string('uploadpartialfile');
break;
case 4: // UPLOAD_ERR_NO_FILE
$errmessage = get_string('uploadnofilefound');
break;
// Note: there is no error with a value of 5
case 6: // UPLOAD_ERR_NO_TMP_DIR
$errmessage = get_string('uploadnotempdir');
break;
case 7: // UPLOAD_ERR_CANT_WRITE
$errmessage = get_string('uploadcantwrite');
break;
case 8: // UPLOAD_ERR_EXTENSION
$errmessage = get_string('uploadextension');
break;
default:
$errmessage = get_string('uploadproblem');
}
return $errmessage;
}
/**
* Recursive function formating an array in POST parameter
* @param array $arraydata - the array that we are going to format and add into &$data array
* @param string $currentdata - a row of the final postdata array at instant T
* when finish, it's assign to $data under this format: name[keyname][][]...[]='value'
* @param array $data - the final data array containing all POST parameters : 1 row = 1 parameter
*/
function format_array_postdata_for_curlcall($arraydata, $currentdata, &$data) {
foreach ($arraydata as $k=>$v) {
$newcurrentdata = $currentdata;
if (is_array($v)) { //the value is an array, call the function recursively
$newcurrentdata = $newcurrentdata.'['.urlencode($k).']';
format_array_postdata_for_curlcall($v, $newcurrentdata, $data);
} else { //add the POST parameter to the $data array
$data[] = $newcurrentdata.'['.urlencode($k).']='.urlencode($v);
}
}
}
/**
* Transform a PHP array into POST parameter
* (see the recursive function format_array_postdata_for_curlcall)
* @param array $postdata
* @return array containing all POST parameters (1 row = 1 POST parameter)
*/
function format_postdata_for_curlcall($postdata) {
$data = array();
foreach ($postdata as $k=>$v) {
if (is_array($v)) {
$currentdata = urlencode($k);
format_array_postdata_for_curlcall($v, $currentdata, $data);
} else {
$data[] = urlencode($k).'='.urlencode($v);
}
}
$convertedpostdata = implode('&', $data);
return $convertedpostdata;
}
/**
* Fetches content of file from Internet (using proxy if defined). Uses cURL extension if present.
* Due to security concerns only downloads from http(s) sources are supported.
*
* @global object
* @param string $url file url starting with http(s)://
* @param array $headers http headers, null if none. If set, should be an
* associative array of header name => value pairs.
* @param array $postdata array means use POST request with given parameters
* @param bool $fullresponse return headers, responses, etc in a similar way snoopy does
* (if false, just returns content)
* @param int $timeout timeout for complete download process including all file transfer
* (default 5 minutes)
* @param int $connecttimeout timeout for connection to server; this is the timeout that
* usually happens if the remote server is completely down (default 20 seconds);
* may not work when using proxy
* @param bool $skipcertverify If true, the peer's SSL certificate will not be checked. Only use this when already in a trusted location.
* @param string $tofile store the downloaded content to file instead of returning it
* @return mixed false if request failed or content of the file as string if ok. true if file downloaded into $tofile successfully.
*/
function download_file_content($url, $headers=null, $postdata=null, $fullresponse=false, $timeout=300, $connecttimeout=20, $skipcertverify=false, $tofile=NULL) {
global $CFG;
// some extra security
$newlines = array("\r", "\n");
if (is_array($headers) ) {
foreach ($headers as $key => $value) {
$headers[$key] = str_replace($newlines, '', $value);
}
}
$url = str_replace($newlines, '', $url);
if (!preg_match('|^https?://|i', $url)) {
if ($fullresponse) {
$response = new stdClass();
$response->status = 0;
$response->headers = array();
$response->response_code = 'Invalid protocol specified in url';
$response->results = '';
$response->error = 'Invalid protocol specified in url';
return $response;
} else {
return false;
}
}
// check if proxy (if used) should be bypassed for this url
$proxybypass = is_proxybypass($url);
if (!$ch = curl_init($url)) {
debugging('Can not init curl.');
return false;
}
// set extra headers
if (is_array($headers) ) {
$headers2 = array();
foreach ($headers as $key => $value) {
$headers2[] = "$key: $value";
}
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers2);
}
if ($skipcertverify) {
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
}
// use POST if requested
if (is_array($postdata)) {
$postdata = format_postdata_for_curlcall($postdata);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata);
}
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $connecttimeout);
curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
if (!ini_get('open_basedir') and !ini_get('safe_mode')) {
// TODO: add version test for '7.10.5'
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_MAXREDIRS, 5);
}
if (!empty($CFG->proxyhost) and !$proxybypass) {
// SOCKS supported in PHP5 only
if (!empty($CFG->proxytype) and ($CFG->proxytype == 'SOCKS5')) {
if (defined('CURLPROXY_SOCKS5')) {
curl_setopt($ch, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
} else {
curl_close($ch);
if ($fullresponse) {
$response = new stdClass();
$response->status = '0';
$response->headers = array();
$response->response_code = 'SOCKS5 proxy is not supported in PHP4';
$response->results = '';
$response->error = 'SOCKS5 proxy is not supported in PHP4';
return $response;
} else {
debugging("SOCKS5 proxy is not supported in PHP4.", DEBUG_ALL);
return false;
}
}
}
curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, false);
if (empty($CFG->proxyport)) {
curl_setopt($ch, CURLOPT_PROXY, $CFG->proxyhost);
} else {
curl_setopt($ch, CURLOPT_PROXY, $CFG->proxyhost.':'.$CFG->proxyport);
}
if (!empty($CFG->proxyuser) and !empty($CFG->proxypassword)) {
curl_setopt($ch, CURLOPT_PROXYUSERPWD, $CFG->proxyuser.':'.$CFG->proxypassword);
if (defined('CURLOPT_PROXYAUTH')) {
// any proxy authentication if PHP 5.1
curl_setopt($ch, CURLOPT_PROXYAUTH, CURLAUTH_BASIC | CURLAUTH_NTLM);
}
}
}
// set up header and content handlers
$received = new stdClass();
$received->headers = array(); // received headers array
$received->tofile = $tofile;
$received->fh = null;