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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/>.
/**
* Core file storage class definition.
*
* @package core_files
* @copyright 2008 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
require_once("$CFG->libdir/filestorage/stored_file.php");
/**
* File storage class used for low level access to stored files.
*
* Only owner of file area may use this class to access own files,
* for example only code in mod/assignment/* may access assignment
* attachments. When some other part of moodle needs to access
* files of modules it has to use file_browser class instead or there
* has to be some callback API.
*
* @package core_files
* @category files
* @copyright 2008 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @since Moodle 2.0
*/
class file_storage {
/** @var string Directory with file contents */
private $filedir;
/** @var string Contents of deleted files not needed any more */
private $trashdir;
/** @var string tempdir */
private $tempdir;
/** @var int Permissions for new directories */
private $dirpermissions;
/** @var int Permissions for new files */
private $filepermissions;
/**
* Constructor - do not use directly use {@link get_file_storage()} call instead.
*
* @param string $filedir full path to pool directory
* @param string $trashdir temporary storage of deleted area
* @param string $tempdir temporary storage of various files
* @param int $dirpermissions new directory permissions
* @param int $filepermissions new file permissions
*/
public function __construct($filedir, $trashdir, $tempdir, $dirpermissions, $filepermissions) {
global $CFG;
$this->filedir = $filedir;
$this->trashdir = $trashdir;
$this->tempdir = $tempdir;
$this->dirpermissions = $dirpermissions;
$this->filepermissions = $filepermissions;
// make sure the file pool directory exists
if (!is_dir($this->filedir)) {
if (!mkdir($this->filedir, $this->dirpermissions, true)) {
throw new file_exception('storedfilecannotcreatefiledirs'); // permission trouble
}
// place warning file in file pool root
if (!file_exists($this->filedir.'/warning.txt')) {
file_put_contents($this->filedir.'/warning.txt',
'This directory contains the content of uploaded files and is controlled by Moodle code. Do not manually move, change or rename any of the files and subdirectories here.');
chmod($this->filedir.'/warning.txt', $CFG->filepermissions);
}
}
// make sure the file pool directory exists
if (!is_dir($this->trashdir)) {
if (!mkdir($this->trashdir, $this->dirpermissions, true)) {
throw new file_exception('storedfilecannotcreatefiledirs'); // permission trouble
}
}
}
/**
* Calculates sha1 hash of unique full path name information.
*
* This hash is a unique file identifier - it is used to improve
* performance and overcome db index size limits.
*
* @param int $contextid context ID
* @param string $component component
* @param string $filearea file area
* @param int $itemid item ID
* @param string $filepath file path
* @param string $filename file name
* @return string sha1 hash
*/
public static function get_pathname_hash($contextid, $component, $filearea, $itemid, $filepath, $filename) {
return sha1("/$contextid/$component/$filearea/$itemid".$filepath.$filename);
}
/**
* Does this file exist?
*
* @param int $contextid context ID
* @param string $component component
* @param string $filearea file area
* @param int $itemid item ID
* @param string $filepath file path
* @param string $filename file name
* @return bool
*/
public function file_exists($contextid, $component, $filearea, $itemid, $filepath, $filename) {
$filepath = clean_param($filepath, PARAM_PATH);
$filename = clean_param($filename, PARAM_FILE);
if ($filename === '') {
$filename = '.';
}
$pathnamehash = $this->get_pathname_hash($contextid, $component, $filearea, $itemid, $filepath, $filename);
return $this->file_exists_by_hash($pathnamehash);
}
/**
* Whether or not the file exist
*
* @param string $pathnamehash path name hash
* @return bool
*/
public function file_exists_by_hash($pathnamehash) {
global $DB;
return $DB->record_exists('files', array('pathnamehash'=>$pathnamehash));
}
/**
* Create instance of file class from database record.
*
* @param stdClass $filerecord record from the files table left join files_reference table
* @return stored_file instance of file abstraction class
*/
public function get_file_instance(stdClass $filerecord) {
$storedfile = new stored_file($this, $filerecord, $this->filedir);
return $storedfile;
}
/**
* Returns an image file that represent the given stored file as a preview
*
* At the moment, only GIF, JPEG and PNG files are supported to have previews. In the
* future, the support for other mimetypes can be added, too (eg. generate an image
* preview of PDF, text documents etc).
*
* @param stored_file $file the file we want to preview
* @param string $mode preview mode, eg. 'thumb'
* @return stored_file|bool false if unable to create the preview, stored file otherwise
*/
public function get_file_preview(stored_file $file, $mode) {
$context = context_system::instance();
$path = '/' . trim($mode, '/') . '/';
$preview = $this->get_file($context->id, 'core', 'preview', 0, $path, $file->get_contenthash());
if (!$preview) {
$preview = $this->create_file_preview($file, $mode);
if (!$preview) {
return false;
}
}
return $preview;
}
/**
* Return an available file name.
*
* This will return the next available file name in the area, adding/incrementing a suffix
* of the file, ie: file.txt > file (1).txt > file (2).txt > etc...
*
* If the file name passed is available without modification, it is returned as is.
*
* @param int $contextid context ID.
* @param string $component component.
* @param string $filearea file area.
* @param int $itemid area item ID.
* @param string $filepath the file path.
* @param string $filename the file name.
* @return string available file name.
* @throws coding_exception if the file name is invalid.
* @since Moodle 2.5
*/
public function get_unused_filename($contextid, $component, $filearea, $itemid, $filepath, $filename) {
global $DB;
// Do not accept '.' or an empty file name (zero is acceptable).
if ($filename == '.' || (empty($filename) && !is_numeric($filename))) {
throw new coding_exception('Invalid file name passed', $filename);
}
// The file does not exist, we return the same file name.
if (!$this->file_exists($contextid, $component, $filearea, $itemid, $filepath, $filename)) {
return $filename;
}
// Trying to locate a file name using the used pattern. We remove the used pattern from the file name first.
$pathinfo = pathinfo($filename);
$basename = $pathinfo['filename'];
$matches = array();
if (preg_match('~^(.+) \(([0-9]+)\)$~', $basename, $matches)) {
$basename = $matches[1];
}
$filenamelike = $DB->sql_like_escape($basename) . ' (%)';
if (isset($pathinfo['extension'])) {
$filenamelike .= '.' . $DB->sql_like_escape($pathinfo['extension']);
}
$filenamelikesql = $DB->sql_like('f.filename', ':filenamelike');
$filenamelen = $DB->sql_length('f.filename');
$sql = "SELECT filename
FROM {files} f
WHERE
f.contextid = :contextid AND
f.component = :component AND
f.filearea = :filearea AND
f.itemid = :itemid AND
f.filepath = :filepath AND
$filenamelikesql
ORDER BY
$filenamelen DESC,
f.filename DESC";
$params = array('contextid' => $contextid, 'component' => $component, 'filearea' => $filearea, 'itemid' => $itemid,
'filepath' => $filepath, 'filenamelike' => $filenamelike);
$results = $DB->get_fieldset_sql($sql, $params, IGNORE_MULTIPLE);
// Loop over the results to make sure we are working on a valid file name. Because 'file (1).txt' and 'file (copy).txt'
// would both be returned, but only the one only containing digits should be used.
$number = 1;
foreach ($results as $result) {
$resultbasename = pathinfo($result, PATHINFO_FILENAME);
$matches = array();
if (preg_match('~^(.+) \(([0-9]+)\)$~', $resultbasename, $matches)) {
$number = $matches[2] + 1;
break;
}
}
// Constructing the new filename.
$newfilename = $basename . ' (' . $number . ')';
if (isset($pathinfo['extension'])) {
$newfilename .= '.' . $pathinfo['extension'];
}
return $newfilename;
}
/**
* Return an available directory name.
*
* This will return the next available directory name in the area, adding/incrementing a suffix
* of the last portion of path, ie: /path/ > /path (1)/ > /path (2)/ > etc...
*
* If the file path passed is available without modification, it is returned as is.
*
* @param int $contextid context ID.
* @param string $component component.
* @param string $filearea file area.
* @param int $itemid area item ID.
* @param string $suggestedpath the suggested file path.
* @return string available file path
* @since Moodle 2.5
*/
public function get_unused_dirname($contextid, $component, $filearea, $itemid, $suggestedpath) {
global $DB;
// Ensure suggestedpath has trailing '/'
$suggestedpath = rtrim($suggestedpath, '/'). '/';
// The directory does not exist, we return the same file path.
if (!$this->file_exists($contextid, $component, $filearea, $itemid, $suggestedpath, '.')) {
return $suggestedpath;
}
// Trying to locate a file path using the used pattern. We remove the used pattern from the path first.
if (preg_match('~^(/.+) \(([0-9]+)\)/$~', $suggestedpath, $matches)) {
$suggestedpath = $matches[1]. '/';
}
$filepathlike = $DB->sql_like_escape(rtrim($suggestedpath, '/')) . ' (%)/';
$filepathlikesql = $DB->sql_like('f.filepath', ':filepathlike');
$filepathlen = $DB->sql_length('f.filepath');
$sql = "SELECT filepath
FROM {files} f
WHERE
f.contextid = :contextid AND
f.component = :component AND
f.filearea = :filearea AND
f.itemid = :itemid AND
f.filename = :filename AND
$filepathlikesql
ORDER BY
$filepathlen DESC,
f.filepath DESC";
$params = array('contextid' => $contextid, 'component' => $component, 'filearea' => $filearea, 'itemid' => $itemid,
'filename' => '.', 'filepathlike' => $filepathlike);
$results = $DB->get_fieldset_sql($sql, $params, IGNORE_MULTIPLE);
// Loop over the results to make sure we are working on a valid file path. Because '/path (1)/' and '/path (copy)/'
// would both be returned, but only the one only containing digits should be used.
$number = 1;
foreach ($results as $result) {
if (preg_match('~ \(([0-9]+)\)/$~', $result, $matches)) {
$number = (int)($matches[1]) + 1;
break;
}
}
return rtrim($suggestedpath, '/'). ' (' . $number . ')/';
}
/**
* Generates a preview image for the stored file
*
* @param stored_file $file the file we want to preview
* @param string $mode preview mode, eg. 'thumb'
* @return stored_file|bool the newly created preview file or false
*/
protected function create_file_preview(stored_file $file, $mode) {
$mimetype = $file->get_mimetype();
if ($mimetype === 'image/gif' or $mimetype === 'image/jpeg' or $mimetype === 'image/png') {
// make a preview of the image
$data = $this->create_imagefile_preview($file, $mode);
} else {
// unable to create the preview of this mimetype yet
return false;
}
if (empty($data)) {
return false;
}
$context = context_system::instance();
$record = array(
'contextid' => $context->id,
'component' => 'core',
'filearea' => 'preview',
'itemid' => 0,
'filepath' => '/' . trim($mode, '/') . '/',
'filename' => $file->get_contenthash(),
);
$imageinfo = getimagesizefromstring($data);
if ($imageinfo) {
$record['mimetype'] = $imageinfo['mime'];
}
return $this->create_file_from_string($record, $data);
}
/**
* Generates a preview for the stored image file
*
* @param stored_file $file the image we want to preview
* @param string $mode preview mode, eg. 'thumb'
* @return string|bool false if a problem occurs, the thumbnail image data otherwise
*/
protected function create_imagefile_preview(stored_file $file, $mode) {
global $CFG;
require_once($CFG->libdir.'/gdlib.php');
if ($mode === 'tinyicon') {
$data = $file->generate_image_thumbnail(24, 24);
} else if ($mode === 'thumb') {
$data = $file->generate_image_thumbnail(90, 90);
} else if ($mode === 'bigthumb') {
$data = $file->generate_image_thumbnail(250, 250);
} else {
throw new file_exception('storedfileproblem', 'Invalid preview mode requested');
}
return $data;
}
/**
* Fetch file using local file id.
*
* Please do not rely on file ids, it is usually easier to use
* pathname hashes instead.
*
* @param int $fileid file ID
* @return stored_file|bool stored_file instance if exists, false if not
*/
public function get_file_by_id($fileid) {
global $DB;
$sql = "SELECT ".self::instance_sql_fields('f', 'r')."
FROM {files} f
LEFT JOIN {files_reference} r
ON f.referencefileid = r.id
WHERE f.id = ?";
if ($filerecord = $DB->get_record_sql($sql, array($fileid))) {
return $this->get_file_instance($filerecord);
} else {
return false;
}
}
/**
* Fetch file using local file full pathname hash
*
* @param string $pathnamehash path name hash
* @return stored_file|bool stored_file instance if exists, false if not
*/
public function get_file_by_hash($pathnamehash) {
global $DB;
$sql = "SELECT ".self::instance_sql_fields('f', 'r')."
FROM {files} f
LEFT JOIN {files_reference} r
ON f.referencefileid = r.id
WHERE f.pathnamehash = ?";
if ($filerecord = $DB->get_record_sql($sql, array($pathnamehash))) {
return $this->get_file_instance($filerecord);
} else {
return false;
}
}
/**
* Fetch locally stored file.
*
* @param int $contextid context ID
* @param string $component component
* @param string $filearea file area
* @param int $itemid item ID
* @param string $filepath file path
* @param string $filename file name
* @return stored_file|bool stored_file instance if exists, false if not
*/
public function get_file($contextid, $component, $filearea, $itemid, $filepath, $filename) {
$filepath = clean_param($filepath, PARAM_PATH);
$filename = clean_param($filename, PARAM_FILE);
if ($filename === '') {
$filename = '.';
}
$pathnamehash = $this->get_pathname_hash($contextid, $component, $filearea, $itemid, $filepath, $filename);
return $this->get_file_by_hash($pathnamehash);
}
/**
* Are there any files (or directories)
*
* @param int $contextid context ID
* @param string $component component
* @param string $filearea file area
* @param bool|int $itemid item id or false if all items
* @param bool $ignoredirs whether or not ignore directories
* @return bool empty
*/
public function is_area_empty($contextid, $component, $filearea, $itemid = false, $ignoredirs = true) {
global $DB;
$params = array('contextid'=>$contextid, 'component'=>$component, 'filearea'=>$filearea);
$where = "contextid = :contextid AND component = :component AND filearea = :filearea";
if ($itemid !== false) {
$params['itemid'] = $itemid;
$where .= " AND itemid = :itemid";
}
if ($ignoredirs) {
$sql = "SELECT 'x'
FROM {files}
WHERE $where AND filename <> '.'";
} else {
$sql = "SELECT 'x'
FROM {files}
WHERE $where AND (filename <> '.' OR filepath <> '/')";
}
return !$DB->record_exists_sql($sql, $params);
}
/**
* Returns all files belonging to given repository
*
* @param int $repositoryid
* @param string $sort A fragment of SQL to use for sorting
*/
public function get_external_files($repositoryid, $sort = '') {
global $DB;
$sql = "SELECT ".self::instance_sql_fields('f', 'r')."
FROM {files} f
LEFT JOIN {files_reference} r
ON f.referencefileid = r.id
WHERE r.repositoryid = ?";
if (!empty($sort)) {
$sql .= " ORDER BY {$sort}";
}
$result = array();
$filerecords = $DB->get_records_sql($sql, array($repositoryid));
foreach ($filerecords as $filerecord) {
$result[$filerecord->pathnamehash] = $this->get_file_instance($filerecord);
}
return $result;
}
/**
* Returns all area files (optionally limited by itemid)
*
* @param int $contextid context ID
* @param string $component component
* @param string $filearea file area
* @param int $itemid item ID or all files if not specified
* @param string $sort A fragment of SQL to use for sorting
* @param bool $includedirs whether or not include directories
* @return stored_file[] array of stored_files indexed by pathanmehash
*/
public function get_area_files($contextid, $component, $filearea, $itemid = false, $sort = "itemid, filepath, filename", $includedirs = true) {
global $DB;
$conditions = array('contextid'=>$contextid, 'component'=>$component, 'filearea'=>$filearea);
if ($itemid !== false) {
$itemidsql = ' AND f.itemid = :itemid ';
$conditions['itemid'] = $itemid;
} else {
$itemidsql = '';
}
$sql = "SELECT ".self::instance_sql_fields('f', 'r')."
FROM {files} f
LEFT JOIN {files_reference} r
ON f.referencefileid = r.id
WHERE f.contextid = :contextid
AND f.component = :component
AND f.filearea = :filearea
$itemidsql";
if (!empty($sort)) {
$sql .= " ORDER BY {$sort}";
}
$result = array();
$filerecords = $DB->get_records_sql($sql, $conditions);
foreach ($filerecords as $filerecord) {
if (!$includedirs and $filerecord->filename === '.') {
continue;
}
$result[$filerecord->pathnamehash] = $this->get_file_instance($filerecord);
}
return $result;
}
/**
* Returns array based tree structure of area files
*
* @param int $contextid context ID
* @param string $component component
* @param string $filearea file area
* @param int $itemid item ID
* @return array each dir represented by dirname, subdirs, files and dirfile array elements
*/
public function get_area_tree($contextid, $component, $filearea, $itemid) {
$result = array('dirname'=>'', 'dirfile'=>null, 'subdirs'=>array(), 'files'=>array());
$files = $this->get_area_files($contextid, $component, $filearea, $itemid, '', true);
// first create directory structure
foreach ($files as $hash=>$dir) {
if (!$dir->is_directory()) {
continue;
}
unset($files[$hash]);
if ($dir->get_filepath() === '/') {
$result['dirfile'] = $dir;
continue;
}
$parts = explode('/', trim($dir->get_filepath(),'/'));
$pointer =& $result;
foreach ($parts as $part) {
if ($part === '') {
continue;
}
if (!isset($pointer['subdirs'][$part])) {
$pointer['subdirs'][$part] = array('dirname'=>$part, 'dirfile'=>null, 'subdirs'=>array(), 'files'=>array());
}
$pointer =& $pointer['subdirs'][$part];
}
$pointer['dirfile'] = $dir;
unset($pointer);
}
foreach ($files as $hash=>$file) {
$parts = explode('/', trim($file->get_filepath(),'/'));
$pointer =& $result;
foreach ($parts as $part) {
if ($part === '') {
continue;
}
$pointer =& $pointer['subdirs'][$part];
}
$pointer['files'][$file->get_filename()] = $file;
unset($pointer);
}
$result = $this->sort_area_tree($result);
return $result;
}
/**
* Sorts the result of {@link file_storage::get_area_tree()}.
*
* @param array $tree Array of results provided by {@link file_storage::get_area_tree()}
* @return array of sorted results
*/
protected function sort_area_tree($tree) {
foreach ($tree as $key => &$value) {
if ($key == 'subdirs') {
core_collator::ksort($value, core_collator::SORT_NATURAL);
foreach ($value as $subdirname => &$subtree) {
$subtree = $this->sort_area_tree($subtree);
}
} else if ($key == 'files') {
core_collator::ksort($value, core_collator::SORT_NATURAL);
}
}
return $tree;
}
/**
* Returns all files and optionally directories
*
* @param int $contextid context ID
* @param string $component component
* @param string $filearea file area
* @param int $itemid item ID
* @param int $filepath directory path
* @param bool $recursive include all subdirectories
* @param bool $includedirs include files and directories
* @param string $sort A fragment of SQL to use for sorting
* @return array of stored_files indexed by pathanmehash
*/
public function get_directory_files($contextid, $component, $filearea, $itemid, $filepath, $recursive = false, $includedirs = true, $sort = "filepath, filename") {
global $DB;
if (!$directory = $this->get_file($contextid, $component, $filearea, $itemid, $filepath, '.')) {
return array();
}
$orderby = (!empty($sort)) ? " ORDER BY {$sort}" : '';
if ($recursive) {
$dirs = $includedirs ? "" : "AND filename <> '.'";
$length = core_text::strlen($filepath);
$sql = "SELECT ".self::instance_sql_fields('f', 'r')."
FROM {files} f
LEFT JOIN {files_reference} r
ON f.referencefileid = r.id
WHERE f.contextid = :contextid AND f.component = :component AND f.filearea = :filearea AND f.itemid = :itemid
AND ".$DB->sql_substr("f.filepath", 1, $length)." = :filepath
AND f.id <> :dirid
$dirs
$orderby";
$params = array('contextid'=>$contextid, 'component'=>$component, 'filearea'=>$filearea, 'itemid'=>$itemid, 'filepath'=>$filepath, 'dirid'=>$directory->get_id());
$files = array();
$dirs = array();
$filerecords = $DB->get_records_sql($sql, $params);
foreach ($filerecords as $filerecord) {
if ($filerecord->filename == '.') {
$dirs[$filerecord->pathnamehash] = $this->get_file_instance($filerecord);
} else {
$files[$filerecord->pathnamehash] = $this->get_file_instance($filerecord);
}
}
$result = array_merge($dirs, $files);
} else {
$result = array();
$params = array('contextid'=>$contextid, 'component'=>$component, 'filearea'=>$filearea, 'itemid'=>$itemid, 'filepath'=>$filepath, 'dirid'=>$directory->get_id());
$length = core_text::strlen($filepath);
if ($includedirs) {
$sql = "SELECT ".self::instance_sql_fields('f', 'r')."
FROM {files} f
LEFT JOIN {files_reference} r
ON f.referencefileid = r.id
WHERE f.contextid = :contextid AND f.component = :component AND f.filearea = :filearea
AND f.itemid = :itemid AND f.filename = '.'
AND ".$DB->sql_substr("f.filepath", 1, $length)." = :filepath
AND f.id <> :dirid
$orderby";
$reqlevel = substr_count($filepath, '/') + 1;
$filerecords = $DB->get_records_sql($sql, $params);
foreach ($filerecords as $filerecord) {
if (substr_count($filerecord->filepath, '/') !== $reqlevel) {
continue;
}
$result[$filerecord->pathnamehash] = $this->get_file_instance($filerecord);
}
}
$sql = "SELECT ".self::instance_sql_fields('f', 'r')."
FROM {files} f
LEFT JOIN {files_reference} r
ON f.referencefileid = r.id
WHERE f.contextid = :contextid AND f.component = :component AND f.filearea = :filearea AND f.itemid = :itemid
AND f.filepath = :filepath AND f.filename <> '.'
$orderby";
$filerecords = $DB->get_records_sql($sql, $params);
foreach ($filerecords as $filerecord) {
$result[$filerecord->pathnamehash] = $this->get_file_instance($filerecord);
}
}
return $result;
}
/**
* Delete all area files (optionally limited by itemid).
*
* @param int $contextid context ID
* @param string $component component
* @param string $filearea file area or all areas in context if not specified
* @param int $itemid item ID or all files if not specified
* @return bool success
*/
public function delete_area_files($contextid, $component = false, $filearea = false, $itemid = false) {
global $DB;
$conditions = array('contextid'=>$contextid);
if ($component !== false) {
$conditions['component'] = $component;
}
if ($filearea !== false) {
$conditions['filearea'] = $filearea;
}
if ($itemid !== false) {
$conditions['itemid'] = $itemid;
}
$filerecords = $DB->get_records('files', $conditions);
foreach ($filerecords as $filerecord) {
$this->get_file_instance($filerecord)->delete();
}
return true; // BC only
}
/**
* Delete all the files from certain areas where itemid is limited by an
* arbitrary bit of SQL.
*
* @param int $contextid the id of the context the files belong to. Must be given.
* @param string $component the owning component. Must be given.
* @param string $filearea the file area name. Must be given.
* @param string $itemidstest an SQL fragment that the itemid must match. Used
* in the query like WHERE itemid $itemidstest. Must used named parameters,
* and may not used named parameters called contextid, component or filearea.
* @param array $params any query params used by $itemidstest.
*/
public function delete_area_files_select($contextid, $component,
$filearea, $itemidstest, array $params = null) {
global $DB;
$where = "contextid = :contextid
AND component = :component
AND filearea = :filearea
AND itemid $itemidstest";
$params['contextid'] = $contextid;
$params['component'] = $component;
$params['filearea'] = $filearea;
$filerecords = $DB->get_recordset_select('files', $where, $params);
foreach ($filerecords as $filerecord) {
$this->get_file_instance($filerecord)->delete();
}
$filerecords->close();
}
/**
* Delete all files associated with the given component.
*
* @param string $component the component owning the file
*/
public function delete_component_files($component) {
global $DB;
$filerecords = $DB->get_recordset('files', array('component' => $component));
foreach ($filerecords as $filerecord) {
$this->get_file_instance($filerecord)->delete();
}
$filerecords->close();
}
/**
* Move all the files in a file area from one context to another.
*
* @param int $oldcontextid the context the files are being moved from.
* @param int $newcontextid the context the files are being moved to.
* @param string $component the plugin that these files belong to.
* @param string $filearea the name of the file area.
* @param int $itemid file item ID
* @return int the number of files moved, for information.
*/
public function move_area_files_to_new_context($oldcontextid, $newcontextid, $component, $filearea, $itemid = false) {
// Note, this code is based on some code that Petr wrote in
// forum_move_attachments in mod/forum/lib.php. I moved it here because
// I needed it in the question code too.
$count = 0;
$oldfiles = $this->get_area_files($oldcontextid, $component, $filearea, $itemid, 'id', false);
foreach ($oldfiles as $oldfile) {
$filerecord = new stdClass();
$filerecord->contextid = $newcontextid;
$this->create_file_from_storedfile($filerecord, $oldfile);
$count += 1;
}
if ($count) {
$this->delete_area_files($oldcontextid, $component, $filearea, $itemid);
}
return $count;
}
/**
* Recursively creates directory.
*
* @param int $contextid context ID
* @param string $component component
* @param string $filearea file area
* @param int $itemid item ID
* @param string $filepath file path
* @param int $userid the user ID
* @return bool success
*/
public function create_directory($contextid, $component, $filearea, $itemid, $filepath, $userid = null) {
global $DB;
// validate all parameters, we do not want any rubbish stored in database, right?
if (!is_number($contextid) or $contextid < 1) {
throw new file_exception('storedfileproblem', 'Invalid contextid');
}
$component = clean_param($component, PARAM_COMPONENT);
if (empty($component)) {
throw new file_exception('storedfileproblem', 'Invalid component');
}
$filearea = clean_param($filearea, PARAM_AREA);
if (empty($filearea)) {
throw new file_exception('storedfileproblem', 'Invalid filearea');
}
if (!is_number($itemid) or $itemid < 0) {
throw new file_exception('storedfileproblem', 'Invalid itemid');
}
$filepath = clean_param($filepath, PARAM_PATH);
if (strpos($filepath, '/') !== 0 or strrpos($filepath, '/') !== strlen($filepath)-1) {
// path must start and end with '/'
throw new file_exception('storedfileproblem', 'Invalid file path');
}
$pathnamehash = $this->get_pathname_hash($contextid, $component, $filearea, $itemid, $filepath, '.');
if ($dir_info = $this->get_file_by_hash($pathnamehash)) {
return $dir_info;
}
static $contenthash = null;
if (!$contenthash) {
$this->add_string_to_pool('');
$contenthash = sha1('');
}
$now = time();
$dir_record = new stdClass();
$dir_record->contextid = $contextid;
$dir_record->component = $component;
$dir_record->filearea = $filearea;
$dir_record->itemid = $itemid;
$dir_record->filepath = $filepath;
$dir_record->filename = '.';
$dir_record->contenthash = $contenthash;
$dir_record->filesize = 0;
$dir_record->timecreated = $now;
$dir_record->timemodified = $now;
$dir_record->mimetype = null;
$dir_record->userid = $userid;
$dir_record->pathnamehash = $pathnamehash;
$DB->insert_record('files', $dir_record);
$dir_info = $this->get_file_by_hash($pathnamehash);
if ($filepath !== '/') {
//recurse to parent dirs
$filepath = trim($filepath, '/');
$filepath = explode('/', $filepath);
array_pop($filepath);
$filepath = implode('/', $filepath);
$filepath = ($filepath === '') ? '/' : "/$filepath/";
$this->create_directory($contextid, $component, $filearea, $itemid, $filepath, $userid);
}
return $dir_info;
}
/**
* Add new local file based on existing local file.
*
* @param stdClass|array $filerecord object or array describing changes
* @param stored_file|int $fileorid id or stored_file instance of the existing local file
* @return stored_file instance of newly created file
*/
public function create_file_from_storedfile($filerecord, $fileorid) {
global $DB;
if ($fileorid instanceof stored_file) {
$fid = $fileorid->get_id();
} else {
$fid = $fileorid;
}
$filerecord = (array)$filerecord; // We support arrays too, do not modify the submitted record!
unset($filerecord['id']);
unset($filerecord['filesize']);
unset($filerecord['contenthash']);
unset($filerecord['pathnamehash']);
$sql = "SELECT ".self::instance_sql_fields('f', 'r')."
FROM {files} f
LEFT JOIN {files_reference} r
ON f.referencefileid = r.id
WHERE f.id = ?";
if (!$newrecord = $DB->get_record_sql($sql, array($fid))) {
throw new file_exception('storedfileproblem', 'File does not exist');
}
unset($newrecord->id);
foreach ($filerecord as $key => $value) {
// validate all parameters, we do not want any rubbish stored in database, right?
if ($key == 'contextid' and (!is_number($value) or $value < 1)) {
throw new file_exception('storedfileproblem', 'Invalid contextid');
}
if ($key == 'component') {
$value = clean_param($value, PARAM_COMPONENT);
if (empty($value)) {
throw new file_exception('storedfileproblem', 'Invalid component');
}
}
if ($key == 'filearea') {
$value = clean_param($value, PARAM_AREA);
if (empty($value)) {
throw new file_exception('storedfileproblem', 'Invalid filearea');
}
}
if ($key == 'itemid' and (!is_number($value) or $value < 0)) {
throw new file_exception('storedfileproblem', 'Invalid itemid');
}
if ($key == 'filepath') {
$value = clean_param($value, PARAM_PATH);
if (strpos($value, '/') !== 0 or strrpos($value, '/') !== strlen($value)-1) {
// path must start and end with '/'
throw new file_exception('storedfileproblem', 'Invalid file path');
}
}
if ($key == 'filename') {
$value = clean_param($value, PARAM_FILE);
if ($value === '') {
// path must start and end with '/'
throw new file_exception('storedfileproblem', 'Invalid file name');
}
}
if ($key === 'timecreated' or $key === 'timemodified') {
if (!is_number($value)) {
throw new file_exception('storedfileproblem', 'Invalid file '.$key);
}
if ($value < 0) {
//NOTE: unfortunately I make a mistake when creating the "files" table, we can not have negative numbers there, on the other hand no file should be older than 1970, right? (skodak)
$value = 0;
}
}
if ($key == 'referencefileid' or $key == 'referencelastsync') {
$value = clean_param($value, PARAM_INT);
}
$newrecord->$key = $value;
}
$newrecord->pathnamehash = $this->get_pathname_hash($newrecord->contextid, $newrecord->component, $newrecord->filearea, $newrecord->itemid, $newrecord->filepath, $newrecord->filename);
if ($newrecord->filename === '.') {
// special case - only this function supports directories ;-)
$directory = $this->create_directory($newrecord->contextid, $newrecord->component, $newrecord->filearea, $newrecord->itemid, $newrecord->filepath, $newrecord->userid);
// update the existing directory with the new data
$newrecord->id = $directory->get_id();
$DB->update_record('files', $newrecord);
return $this->get_file_instance($newrecord);
}
// note: referencefileid is copied from the original file so that
// creating a new file from an existing alias creates new alias implicitly.
// here we just check the database consistency.
if (!empty($newrecord->repositoryid)) {
if ($newrecord->referencefileid != $this->get_referencefileid($newrecord->repositoryid, $newrecord->reference, MUST_EXIST)) {
throw new file_reference_exception($newrecord->repositoryid, $newrecord->reference, $newrecord->referencefileid);
}
}
try {
$newrecord->id = $DB->insert_record('files', $newrecord);
} catch (dml_exception $e) {
throw new stored_file_creation_exception($newrecord->contextid, $newrecord->component, $newrecord->filearea, $newrecord->itemid,
$newrecord->filepath, $newrecord->filename, $e->debuginfo);
}
$this->create_directory($newrecord->contextid, $newrecord->component, $newrecord->filearea, $newrecord->itemid, $newrecord->filepath, $newrecord->userid);
return $this->get_file_instance($newrecord);
}
/**
* Add new local file.
*
* @param stdClass|array $filerecord object or array describing file
* @param string $url the URL to the file
* @param array $options {@link download_file_content()} options
* @param bool $usetempfile use temporary file for download, may prevent out of memory problems
* @return stored_file
*/
public function create_file_from_url($filerecord, $url, array $options = null, $usetempfile = false) {
$filerecord = (array)$filerecord; // Do not modify the submitted record, this cast unlinks objects.
$filerecord = (object)$filerecord; // We support arrays too.
$headers = isset($options['headers']) ? $options['headers'] : null;
$postdata = isset($options['postdata']) ? $options['postdata'] : null;
$fullresponse = isset($options['fullresponse']) ? $options['fullresponse'] : false;
$timeout = isset($options['timeout']) ? $options['timeout'] : 300;
$connecttimeout = isset($options['connecttimeout']) ? $options['connecttimeout'] : 20;
$skipcertverify = isset($options['skipcertverify']) ? $options['skipcertverify'] : false;
$calctimeout = isset($options['calctimeout']) ? $options['calctimeout'] : false;
if (!isset($filerecord->filename)) {
$parts = explode('/', $url);
$filename = array_pop($parts);
$filerecord->filename = clean_param($filename, PARAM_FILE);
}
$source = !empty($filerecord->source) ? $filerecord->source : $url;
$filerecord->source = clean_param($source, PARAM_URL);
if ($usetempfile) {
check_dir_exists($this->tempdir);
$tmpfile = tempnam($this->tempdir, 'newfromurl');
$content = download_file_content($url, $headers, $postdata, $fullresponse, $timeout, $connecttimeout, $skipcertverify, $tmpfile, $calctimeout);
if ($content === false) {
throw new file_exception('storedfileproblem', 'Can not fetch file form URL');
}
try {
$newfile = $this->create_file_from_pathname($filerecord, $tmpfile);
@unlink($tmpfile);
return $newfile;
} catch (Exception $e) {
@unlink($tmpfile);
throw $e;
}
} else {
$content = download_file_content($url, $headers, $postdata, $fullresponse, $timeout, $connecttimeout, $skipcertverify, NULL, $calctimeout);
if ($content === false) {
throw new file_exception('storedfileproblem', 'Can not fetch file form URL');
}
return $this->create_file_from_string($filerecord, $content);
}
}
/**
* Add new local file.
*
* @param stdClass|array $filerecord object or array describing file
* @param string $pathname path to file or content of file
* @return stored_file
*/
public function create_file_from_pathname($filerecord, $pathname) {
global $DB;
$filerecord = (array)$filerecord; // Do not modify the submitted record, this cast unlinks objects.
$filerecord = (object)$filerecord; // We support arrays too.
// validate all parameters, we do not want any rubbish stored in database, right?
if (!is_number($filerecord->contextid) or $filerecord->contextid < 1) {
throw new file_exception('storedfileproblem', 'Invalid contextid');
}
$filerecord->component = clean_param($filerecord->component, PARAM_COMPONENT);
if (empty($filerecord->component)) {
throw new file_exception('storedfileproblem', 'Invalid component');
}
$filerecord->filearea = clean_param($filerecord->filearea, PARAM_AREA);
if (empty($filerecord->filearea)) {
throw new file_exception('storedfileproblem', 'Invalid filearea');
}
if (!is_number($filerecord->itemid) or $filerecord->itemid < 0) {
throw new file_exception('storedfileproblem', 'Invalid itemid');
}
if (!empty($filerecord->sortorder)) {
if (!is_number($filerecord->sortorder) or $filerecord->sortorder < 0) {
$filerecord->sortorder = 0;
}
} else {
$filerecord->sortorder = 0;
}
$filerecord->filepath = clean_param($filerecord->filepath, PARAM_PATH);
if (strpos($filerecord->filepath, '/') !== 0 or strrpos($filerecord->filepath, '/') !== strlen($filerecord->filepath)-1) {
// path must start and end with '/'
throw new file_exception('storedfileproblem', 'Invalid file path');
}
$filerecord->filename = clean_param($filerecord->filename, PARAM_FILE);
if ($filerecord->filename === '') {
// filename must not be empty
throw new file_exception('storedfileproblem', 'Invalid file name');
}
$now = time();
if (isset($filerecord->timecreated)) {
if (!is_number($filerecord->timecreated)) {
throw new file_exception('storedfileproblem', 'Invalid file timecreated');
}
if ($filerecord->timecreated < 0) {
//NOTE: unfortunately I make a mistake when creating the "files" table, we can not have negative numbers there, on the other hand no file should be older than 1970, right? (skodak)
$filerecord->timecreated = 0;
}
} else {
$filerecord->timecreated = $now;
}
if (isset($filerecord->timemodified)) {
if (!is_number($filerecord->timemodified)) {
throw new file_exception('storedfileproblem', 'Invalid file timemodified');
}
if ($filerecord->timemodified < 0) {
//NOTE: unfortunately I make a mistake when creating the "files" table, we can not have negative numbers there, on the other hand no file should be older than 1970, right? (skodak)
$filerecord->timemodified = 0;
}
} else {
$filerecord->timemodified = $now;
}
$newrecord = new stdClass();
$newrecord->contextid = $filerecord->contextid;
$newrecord->component = $filerecord->component;
$newrecord->filearea = $filerecord->filearea;
$newrecord->itemid = $filerecord->itemid;
$newrecord->filepath = $filerecord->filepath;
$newrecord->filename = $filerecord->filename;
$newrecord->timecreated = $filerecord->timecreated;
$newrecord->timemodified = $filerecord->timemodified;
$newrecord->mimetype = empty($filerecord->mimetype) ? $this->mimetype($pathname, $filerecord->filename) : $filerecord->mimetype;
$newrecord->userid = empty($filerecord->userid) ? null : $filerecord->userid;
$newrecord->source = empty($filerecord->source) ? null : $filerecord->source;
$newrecord->author = empty($filerecord->author) ? null : $filerecord->author;
$newrecord->license = empty($filerecord->license) ? null : $filerecord->license;
$newrecord->status = empty($filerecord->status) ? 0 : $filerecord->status;
$newrecord->sortorder = $filerecord->sortorder;
list($newrecord->contenthash, $newrecord->filesize, $newfile) = $this->add_file_to_pool($pathname);
$newrecord->pathnamehash = $this->get_pathname_hash($newrecord->contextid, $newrecord->component, $newrecord->filearea, $newrecord->itemid, $newrecord->filepath, $newrecord->filename);
try {
$newrecord->id = $DB->insert_record('files', $newrecord);
} catch (dml_exception $e) {
if ($newfile) {
$this->deleted_file_cleanup($newrecord->contenthash);
}
throw new stored_file_creation_exception($newrecord->contextid, $newrecord->component, $newrecord->filearea, $newrecord->itemid,
$newrecord->filepath, $newrecord->filename, $e->debuginfo);
}
$this->create_directory($newrecord->contextid, $newrecord->component, $newrecord->filearea, $newrecord->itemid, $newrecord->filepath, $newrecord->userid);
return $this->get_file_instance($newrecord);
}
/**
* Add new local file.
*
* @param stdClass|array $filerecord object or array describing file
* @param string $content content of file
* @return stored_file
*/
public function create_file_from_string($filerecord, $content) {
global $DB;
$filerecord = (array)$filerecord; // Do not modify the submitted record, this cast unlinks objects.
$filerecord = (object)$filerecord; // We support arrays too.
// validate all parameters, we do not want any rubbish stored in database, right?
if (!is_number($filerecord->contextid) or $filerecord->contextid < 1) {
throw new file_exception('storedfileproblem', 'Invalid contextid');
}
$filerecord->component = clean_param($filerecord->component, PARAM_COMPONENT);
if (empty($filerecord->component)) {
throw new file_exception('storedfileproblem', 'Invalid component');
}
$filerecord->filearea = clean_param($filerecord->filearea, PARAM_AREA);
if (empty($filerecord->filearea)) {
throw new file_exception('storedfileproblem', 'Invalid filearea');
}
if (!is_number($filerecord->itemid) or $filerecord->itemid < 0) {
throw new file_exception('storedfileproblem', 'Invalid itemid');
}
if (!empty($filerecord->sortorder)) {
if (!is_number($filerecord->sortorder) or $filerecord->sortorder < 0) {
$filerecord->sortorder = 0;
}
} else {
$filerecord->sortorder = 0;
}
$filerecord->filepath = clean_param($filerecord->filepath, PARAM_PATH);
if (strpos($filerecord->filepath, '/') !== 0 or strrpos($filerecord->filepath, '/') !== strlen($filerecord->filepath)-1) {
// path must start and end with '/'
throw new file_exception('storedfileproblem', 'Invalid file path');
}
$filerecord->filename = clean_param($filerecord->filename, PARAM_FILE);
if ($filerecord->filename === '') {
// path must start and end with '/'
throw new file_exception('storedfileproblem', 'Invalid file name');
}
$now = time();
if (isset($filerecord->timecreated)) {
if (!is_number($filerecord->timecreated)) {
throw new file_exception('storedfileproblem', 'Invalid file timecreated');
}
if ($filerecord->timecreated < 0) {
//NOTE: unfortunately I make a mistake when creating the "files" table, we can not have negative numbers there, on the other hand no file should be older than 1970, right? (skodak)
$filerecord->timecreated = 0;
}
} else {
$filerecord->timecreated = $now;
}
if (isset($filerecord->timemodified)) {
if (!is_number($filerecord->timemodified)) {
throw new file_exception('storedfileproblem', 'Invalid file timemodified');
}
if ($filerecord->timemodified < 0) {
//NOTE: unfortunately I make a mistake when creating the "files" table, we can not have negative numbers there, on the other hand no file should be older than 1970, right? (skodak)
$filerecord->timemodified = 0;
}
} else {
$filerecord->timemodified = $now;
}
$newrecord = new stdClass();
$newrecord->contextid = $filerecord->contextid;
$newrecord->component = $filerecord->component;
$newrecord->filearea = $filerecord->filearea;
$newrecord->itemid = $filerecord->itemid;
$newrecord->filepath = $filerecord->filepath;
$newrecord->filename = $filerecord->filename;
$newrecord->timecreated = $filerecord->timecreated;
$newrecord->timemodified = $filerecord->timemodified;
$newrecord->userid = empty($filerecord->userid) ? null : $filerecord->userid;
$newrecord->source = empty($filerecord->source) ? null : $filerecord->source;
$newrecord->author = empty($filerecord->author) ? null : $filerecord->author;
$newrecord->license = empty($filerecord->license) ? null : $filerecord->license;
$newrecord->status = empty($filerecord->status) ? 0 : $filerecord->status;
$newrecord->sortorder = $filerecord->sortorder;
list($newrecord->contenthash, $newrecord->filesize, $newfile) = $this->add_string_to_pool($content);
$filepathname = $this->path_from_hash($newrecord->contenthash) . '/' . $newrecord->contenthash;
// get mimetype by magic bytes
$newrecord->mimetype = empty($filerecord->mimetype) ? $this->mimetype($filepathname, $filerecord->filename) : $filerecord->mimetype;
$newrecord->pathnamehash = $this->get_pathname_hash($newrecord->contextid, $newrecord->component, $newrecord->filearea, $newrecord->itemid, $newrecord->filepath, $newrecord->filename);
try {
$newrecord->id = $DB->insert_record('files', $newrecord);
} catch (dml_exception $e) {
if ($newfile) {
$this->deleted_file_cleanup($newrecord->contenthash);
}
throw new stored_file_creation_exception($newrecord->contextid, $newrecord->component, $newrecord->filearea, $newrecord->itemid,
$newrecord->filepath, $newrecord->filename, $e->debuginfo);
}
$this->create_directory($newrecord->contextid, $newrecord->component, $newrecord->filearea, $newrecord->itemid, $newrecord->filepath, $newrecord->userid);
return $this->get_file_instance($newrecord);
}
/**
* Create a new alias/shortcut file from file reference information
*
* @param stdClass|array $filerecord object or array describing the new file
* @param int $repositoryid the id of the repository that provides the original file
* @param string $reference the information required by the repository to locate the original file
* @param array $options options for creating the new file
* @return stored_file
*/
public function create_file_from_reference($filerecord, $repositoryid, $reference, $options = array()) {
global $DB;
$filerecord = (array)$filerecord; // Do not modify the submitted record, this cast unlinks objects.
$filerecord = (object)$filerecord; // We support arrays too.
// validate all parameters, we do not want any rubbish stored in database, right?
if (!is_number($filerecord->contextid) or $filerecord->contextid < 1) {
throw new file_exception('storedfileproblem', 'Invalid contextid');
}
$filerecord->component = clean_param($filerecord->component, PARAM_COMPONENT);
if (empty($filerecord->component)) {
throw new file_exception('storedfileproblem', 'Invalid component');
}
$filerecord->filearea = clean_param($filerecord->filearea, PARAM_AREA);
if (empty($filerecord->filearea)) {
throw new file_exception('storedfileproblem', 'Invalid filearea');
}
if (!is_number($filerecord->itemid) or $filerecord->itemid < 0) {
throw new file_exception('storedfileproblem', 'Invalid itemid');
}
if (!empty($filerecord->sortorder)) {
if (!is_number($filerecord->sortorder) or $filerecord->sortorder < 0) {
$filerecord->sortorder = 0;
}
} else {
$filerecord->sortorder = 0;
}
$filerecord->mimetype = empty($filerecord->mimetype) ? $this->mimetype($filerecord->filename) : $filerecord->mimetype;
$filerecord->userid = empty($filerecord->userid) ? null : $filerecord->userid;
$filerecord->source = empty($filerecord->source) ? null : $filerecord->source;
$filerecord->author = empty($filerecord->author) ? null : $filerecord->author;
$filerecord->license = empty($filerecord->license) ? null : $filerecord->license;
$filerecord->status = empty($filerecord->status) ? 0 : $filerecord->status;
$filerecord->filepath = clean_param($filerecord->filepath, PARAM_PATH);
if (strpos($filerecord->filepath, '/') !== 0 or strrpos($filerecord->filepath, '/') !== strlen($filerecord->filepath)-1) {
// Path must start and end with '/'.
throw new file_exception('storedfileproblem', 'Invalid file path');
}
$filerecord->filename = clean_param($filerecord->filename, PARAM_FILE);
if ($filerecord->filename === '') {
// Path must start and end with '/'.
throw new file_exception('storedfileproblem', 'Invalid file name');
}
$now = time();
if (isset($filerecord->timecreated)) {
if (!is_number($filerecord->timecreated)) {
throw new file_exception('storedfileproblem', 'Invalid file timecreated');
}
if ($filerecord->timecreated < 0) {
// NOTE: unfortunately I make a mistake when creating the "files" table, we can not have negative numbers there, on the other hand no file should be older than 1970, right? (skodak)
$filerecord->timecreated = 0;
}
} else {
$filerecord->timecreated = $now;
}
if (isset($filerecord->timemodified)) {
if (!is_number($filerecord->timemodified)) {
throw new file_exception('storedfileproblem', 'Invalid file timemodified');
}
if ($filerecord->timemodified < 0) {
// NOTE: unfortunately I make a mistake when creating the "files" table, we can not have negative numbers there, on the other hand no file should be older than 1970, right? (skodak)
$filerecord->timemodified = 0;
}
} else {
$filerecord->timemodified = $now;
}
$transaction = $DB->start_delegated_transaction();
try {
$filerecord->referencefileid = $this->get_or_create_referencefileid($repositoryid, $reference);
} catch (Exception $e) {
throw new file_reference_exception($repositoryid, $reference, null, null, $e->getMessage());
}
if (isset($filerecord->contenthash) && $this->content_exists($filerecord->contenthash)) {
// there was specified the contenthash for a file already stored in moodle filepool
if (empty($filerecord->filesize)) {
$filepathname = $this->path_from_hash($filerecord->contenthash) . '/' . $filerecord->contenthash;
$filerecord->filesize = filesize($filepathname);
} else {
$filerecord->filesize = clean_param($filerecord->filesize, PARAM_INT);
}
} else {
// atempt to get the result of last synchronisation for this reference
$lastcontent = $DB->get_record('files', array('referencefileid' => $filerecord->referencefileid),
'id, contenthash, filesize', IGNORE_MULTIPLE);
if ($lastcontent) {
$filerecord->contenthash = $lastcontent->contenthash;
$filerecord->filesize = $lastcontent->filesize;
} else {
// External file doesn't have content in moodle.
// So we create an empty file for it.
list($filerecord->contenthash, $filerecord->filesize, $newfile) = $this->add_string_to_pool(null);
}
}
$filerecord->pathnamehash = $this->get_pathname_hash($filerecord->contextid, $filerecord->component, $filerecord->filearea, $filerecord->itemid, $filerecord->filepath, $filerecord->filename);
try {
$filerecord->id = $DB->insert_record('files', $filerecord);
} catch (dml_exception $e) {
if (!empty($newfile)) {
$this->deleted_file_cleanup($filerecord->contenthash);
}
throw new stored_file_creation_exception($filerecord->contextid, $filerecord->component, $filerecord->filearea, $filerecord->itemid,
$filerecord->filepath, $filerecord->filename, $e->debuginfo);
}
$this->create_directory($filerecord->contextid, $filerecord->component, $filerecord->filearea, $filerecord->itemid, $filerecord->filepath, $filerecord->userid);
$transaction->allow_commit();
// this will retrieve all reference information from DB as well
return $this->get_file_by_id($filerecord->id);
}
/**
* Creates new image file from existing.
*
* @param stdClass|array $filerecord object or array describing new file
* @param int|stored_file $fid file id or stored file object
* @param int $newwidth in pixels
* @param int $newheight in pixels
* @param bool $keepaspectratio whether or not keep aspect ratio
* @param int $quality depending on image type 0-100 for jpeg, 0-9 (0 means no compression) for png
* @return stored_file
*/
public function convert_image($filerecord, $fid, $newwidth = null, $newheight = null, $keepaspectratio = true, $quality = null) {
if (!function_exists('imagecreatefromstring')) {
//Most likely the GD php extension isn't installed
//image conversion cannot succeed
throw new file_exception('storedfileproblem', 'imagecreatefromstring() doesnt exist. The PHP extension "GD" must be installed for image conversion.');
}
if ($fid instanceof stored_file) {
$fid = $fid->get_id();
}
$filerecord = (array)$filerecord; // We support arrays too, do not modify the submitted record!
if (!$file = $this->get_file_by_id($fid)) { // Make sure file really exists and we we correct data.
throw new file_exception('storedfileproblem', 'File does not exist');
}
if (!$imageinfo = $file->get_imageinfo()) {
throw new file_exception('storedfileproblem', 'File is not an image');
}
if (!isset($filerecord['filename'])) {
$filerecord['filename'] = $file->get_filename();
}
if (!isset($filerecord['mimetype'])) {
$filerecord['mimetype'] = $imageinfo['mimetype'];
}
$width = $imageinfo['width'];
$height = $imageinfo['height'];
$mimetype = $imageinfo['mimetype'];
if ($keepaspectratio) {
if (0 >= $newwidth and 0 >= $newheight) {
// no sizes specified
$newwidth = $width;
$newheight = $height;
} else if (0 < $newwidth and 0 < $newheight) {
$xheight = ($newwidth*($height/$width));
if ($xheight < $newheight) {
$newheight = (int)$xheight;
} else {
$newwidth = (int)($newheight*($width/$height));
}
} else if (0 < $newwidth) {
$newheight = (int)($newwidth*($height/$width));
} else { //0 < $newheight
$newwidth = (int)($newheight*($width/$height));
}
} else {
if (0 >= $newwidth) {
$newwidth = $width;
}
if (0 >= $newheight) {
$newheight = $height;
}
}
$img = imagecreatefromstring($file->get_content());
if ($height != $newheight or $width != $newwidth) {
$newimg = imagecreatetruecolor($newwidth, $newheight);
if (!imagecopyresized($newimg, $img, 0, 0, 0, 0, $newwidth, $newheight, $width, $height)) {
// weird
throw new file_exception('storedfileproblem', 'Can not resize image');
}
imagedestroy($img);
$img = $newimg;
}
ob_start();
switch ($filerecord['mimetype']) {
case 'image/gif':
imagegif($img);
break;
case 'image/jpeg':
if (is_null($quality)) {
imagejpeg($img);
} else {
imagejpeg($img, NULL, $quality);
}
break;
case 'image/png':
$quality = (int)$quality;
imagepng($img, NULL, $quality, NULL);
break;
default:
throw new file_exception('storedfileproblem', 'Unsupported mime type');
}
$content = ob_get_contents();
ob_end_clean();
imagedestroy($img);
if (!$content) {
throw new file_exception('storedfileproblem', 'Can not convert image');
}
return $this->create_file_from_string($filerecord, $content);
}
/**
* Add file content to sha1 pool.
*
* @param string $pathname path to file
* @param string $contenthash sha1 hash of content if known (performance only)
* @return array (contenthash, filesize, newfile)
*/
public function add_file_to_pool($pathname, $contenthash = NULL) {
global $CFG;
if (!is_readable($pathname)) {
throw new file_exception('storedfilecannotread', '', $pathname);
}
$filesize = filesize($pathname);
if ($filesize === false) {
throw new file_exception('storedfilecannotread', '', $pathname);
}
if (is_null($contenthash)) {
$contenthash = sha1_file($pathname);
} else if ($CFG->debugdeveloper) {
$filehash = sha1_file($pathname);
if ($filehash === false) {
throw new file_exception('storedfilecannotread', '', $pathname);
}
if ($filehash !== $contenthash) {
// Hopefully this never happens, if yes we need to fix calling code.
debugging("Invalid contenthash submitted for file $pathname", DEBUG_DEVELOPER);
$contenthash = $filehash;
}
}
if ($contenthash === false) {
throw new file_exception('storedfilecannotread', '', $pathname);
}
if ($filesize > 0 and $contenthash === sha1('')) {
// Did the file change or is sha1_file() borked for this file?
clearstatcache();
$contenthash = sha1_file($pathname);
$filesize = filesize($pathname);
if ($contenthash === false or $filesize === false) {
throw new file_exception('storedfilecannotread', '', $pathname);
}
if ($filesize > 0 and $contenthash === sha1('')) {
// This is very weird...
throw new file_exception('storedfilecannotread', '', $pathname);
}
}
$hashpath = $this->path_from_hash($contenthash);
$hashfile = "$hashpath/$contenthash";
$newfile = true;
if (file_exists($hashfile)) {
if (filesize($hashfile) === $filesize) {
return array($contenthash, $filesize, false);
}
if (sha1_file($hashfile) === $contenthash) {
// Jackpot! We have a sha1 collision.
mkdir("$this->filedir/jackpot/", $this->dirpermissions, true);
copy($pathname, "$this->filedir/jackpot/{$contenthash}_1");
copy($hashfile, "$this->filedir/jackpot/{$contenthash}_2");
throw new file_pool_content_exception($contenthash);
}
debugging("Replacing invalid content file $contenthash");
unlink($hashfile);
$newfile = false;
}
if (!is_dir($hashpath)) {
if (!mkdir($hashpath, $this->dirpermissions, true)) {
// Permission trouble.
throw new file_exception('storedfilecannotcreatefiledirs');
}
}
// Let's try to prevent some race conditions.
$prev = ignore_user_abort(true);
@unlink($hashfile.'.tmp');
if (!copy($pathname, $hashfile.'.tmp')) {
// Borked permissions or out of disk space.
ignore_user_abort($prev);
throw new file_exception('storedfilecannotcreatefile');
}
if (filesize($hashfile.'.tmp') !== $filesize) {
// This should not happen.
unlink($hashfile.'.tmp');
ignore_user_abort($prev);
throw new file_exception('storedfilecannotcreatefile');
}
rename($hashfile.'.tmp', $hashfile);
chmod($hashfile, $this->filepermissions); // Fix permissions if needed.
@unlink($hashfile.'.tmp'); // Just in case anything fails in a weird way.
ignore_user_abort($prev);
return array($contenthash, $filesize, $newfile);
}
/**
* Add string content to sha1 pool.
*
* @param string $content file content - binary string
* @return array (contenthash, filesize, newfile)
*/
public function add_string_to_pool($content) {
global $CFG;
$contenthash = sha1($content);
$filesize = strlen($content); // binary length
$hashpath = $this->path_from_hash($contenthash);
$hashfile = "$hashpath/$contenthash";
$newfile = true;
if (file_exists($hashfile)) {
if (filesize($hashfile) === $filesize) {
return array($contenthash, $filesize, false);
}
if (sha1_file($hashfile) === $contenthash) {
// Jackpot! We have a sha1 collision.
mkdir("$this->filedir/jackpot/", $this->dirpermissions, true);
copy($hashfile, "$this->filedir/jackpot/{$contenthash}_1");
file_put_contents("$this->filedir/jackpot/{$contenthash}_2", $content);
throw new file_pool_content_exception($contenthash);
}
debugging("Replacing invalid content file $contenthash");
unlink($hashfile);
$newfile = false;
}
if (!is_dir($hashpath)) {
if (!mkdir($hashpath, $this->dirpermissions, true)) {
// Permission trouble.
throw new file_exception('storedfilecannotcreatefiledirs');
}
}
// Hopefully this works around most potential race conditions.
$prev = ignore_user_abort(true);
if (!empty($CFG->preventfilelocking)) {
$newsize = file_put_contents($hashfile.'.tmp', $content);
} else {
$newsize = file_put_contents($hashfile.'.tmp', $content, LOCK_EX);
}
if ($newsize === false) {
// Borked permissions most likely.
ignore_user_abort($prev);
throw new file_exception('storedfilecannotcreatefile');
}
if (filesize($hashfile.'.tmp') !== $filesize) {
// Out of disk space?
unlink($hashfile.'.tmp');
ignore_user_abort($prev);
throw new file_exception('storedfilecannotcreatefile');
}
rename($hashfile.'.tmp', $hashfile);
chmod($hashfile, $this->filepermissions); // Fix permissions if needed.
@unlink($hashfile.'.tmp'); // Just in case anything fails in a weird way.
ignore_user_abort($prev);
return array($contenthash, $filesize, $newfile);
}
/**
* Serve file content using X-Sendfile header.
* Please make sure that all headers are already sent
* and the all access control checks passed.
*
* @param string $contenthash sah1 hash of the file content to be served
* @return bool success
*/
public function xsendfile($contenthash) {
global $CFG;
require_once("$CFG->libdir/xsendfilelib.php");
$hashpath = $this->path_from_hash($contenthash);
return xsendfile("$hashpath/$contenthash");
}
/**
* Content exists
*
* @param string $contenthash
* @return bool
*/
public function content_exists($contenthash) {
$dir = $this->path_from_hash($contenthash);
$filepath = $dir . '/' . $contenthash;
return file_exists($filepath);
}
/**
* Return path to file with given hash.
*
* NOTE: must not be public, files in pool must not be modified
*
* @param string $contenthash content hash
* @return string expected file location
*/
protected function path_from_hash($contenthash) {
$l1 = $contenthash[0].$contenthash[1];
$l2 = $contenthash[2].$contenthash[3];
return "$this->filedir/$l1/$l2";
}
/**
* Return path to file with given hash.
*
* NOTE: must not be public, files in pool must not be modified
*
* @param string $contenthash content hash
* @return string expected file location
*/
protected function trash_path_from_hash($contenthash) {
$l1 = $contenthash[0].$contenthash[1];
$l2 = $contenthash[2].$contenthash[3];
return "$this->trashdir/$l1/$l2";
}
/**
* Tries to recover missing content of file from trash.
*
* @param stored_file $file stored_file instance
* @return bool success
*/
public function try_content_recovery($file) {
$contenthash = $file->get_contenthash();
$trashfile = $this->trash_path_from_hash($contenthash).'/'.$contenthash;
if (!is_readable($trashfile)) {
if (!is_readable($this->trashdir.'/'.$contenthash)) {
return false;
}
// nice, at least alternative trash file in trash root exists
$trashfile = $this->trashdir.'/'.$contenthash;
}
if (filesize($trashfile) != $file->get_filesize() or sha1_file($trashfile) != $contenthash) {
//weird, better fail early
return false;
}
$contentdir = $this->path_from_hash($contenthash);
$contentfile = $contentdir.'/'.$contenthash;
if (file_exists($contentfile)) {
//strange, no need to recover anything
return true;
}
if (!is_dir($contentdir)) {
if (!mkdir($contentdir, $this->dirpermissions, true)) {
return false;
}
}
return rename($trashfile, $contentfile);
}
/**
* Marks pool file as candidate for deleting.
*
* DO NOT call directly - reserved for core!!
*
* @param string $contenthash
*/
public function deleted_file_cleanup($contenthash) {
global $DB;
if ($contenthash === sha1('')) {
// No need to delete empty content file with sha1('') content hash.
return;
}
//Note: this section is critical - in theory file could be reused at the same
// time, if this happens we can still recover the file from trash
if ($DB->record_exists('files', array('contenthash'=>$contenthash))) {
// file content is still used
return;
}
//move content file to trash
$contentfile = $this->path_from_hash($contenthash).'/'.$contenthash;
if (!file_exists($contentfile)) {
//weird, but no problem
return;
}
$trashpath = $this->trash_path_from_hash($contenthash);
$trashfile = $trashpath.'/'.$contenthash;
if (file_exists($trashfile)) {
// we already have this content in trash, no need to move it there
unlink($contentfile);
return;
}
if (!is_dir($trashpath)) {
mkdir($trashpath, $this->dirpermissions, true);
}
rename($contentfile, $trashfile);
chmod($trashfile, $this->filepermissions); // fix permissions if needed
}
/**
* When user referring to a moodle file, we build the reference field
*
* @param array $params
* @return string
*/
public static function pack_reference($params) {
$params = (array)$params;
$reference = array();
$reference['contextid'] = is_null($params['contextid']) ? null : clean_param($params['contextid'], PARAM_INT);
$reference['component'] = is_null($params['component']) ? null : clean_param($params['component'], PARAM_COMPONENT);
$reference['itemid'] = is_null($params['itemid']) ? null : clean_param($params['itemid'], PARAM_INT);
$reference['filearea'] = is_null($params['filearea']) ? null : clean_param($params['filearea'], PARAM_AREA);
$reference['filepath'] = is_null($params['filepath']) ? null : clean_param($params['filepath'], PARAM_PATH);
$reference['filename'] = is_null($params['filename']) ? null : clean_param($params['filename'], PARAM_FILE);
return base64_encode(serialize($reference));
}
/**
* Unpack reference field
*
* @param string $str
* @param bool $cleanparams if set to true, array elements will be passed through {@link clean_param()}
* @throws file_reference_exception if the $str does not have the expected format
* @return array
*/
public static function unpack_reference($str, $cleanparams = false) {
$decoded = base64_decode($str, true);
if ($decoded === false) {
throw new file_reference_exception(null, $str, null, null, 'Invalid base64 format');
}
$params = @unserialize($decoded); // hide E_NOTICE
if ($params === false) {
throw new file_reference_exception(null, $decoded, null, null, 'Not an unserializeable value');
}
if (is_array($params) && $cleanparams) {
$params = array(
'component' => is_null($params['component']) ? '' : clean_param($params['component'], PARAM_COMPONENT),
'filearea' => is_null($params['filearea']) ? '' : clean_param($params['filearea'], PARAM_AREA),
'itemid' => is_null($params['itemid']) ? 0 : clean_param($params['itemid'], PARAM_INT),
'filename' => is_null($params['filename']) ? null : clean_param($params['filename'], PARAM_FILE),
'filepath' => is_null($params['filepath']) ? null : clean_param($params['filepath'], PARAM_PATH),
'contextid' => is_null($params['contextid']) ? null : clean_param($params['contextid'], PARAM_INT)
);
}
return $params;
}
/**
* Search through the server files.
*
* The query parameter will be used in conjuction with the SQL directive
* LIKE, so include '%' in it if you need to. This search will always ignore
* user files and directories. Note that the search is case insensitive.
*
* This query can quickly become inefficient so use it sparignly.
*
* @param string $query The string used with SQL LIKE.
* @param integer $from The offset to start the search at.
* @param integer $limit The maximum number of results.
* @param boolean $count When true this methods returns the number of results availabe,
* disregarding the parameters $from and $limit.
* @return int|array Integer when count, otherwise array of stored_file objects.
*/
public function search_server_files($query, $from = 0, $limit = 20, $count = false) {
global $DB;
$params = array(
'contextlevel' => CONTEXT_USER,
'directory' => '.',
'query' => $query
);
if ($count) {
$select = 'COUNT(1)';
} else {
$select = self::instance_sql_fields('f', 'r');
}
$like = $DB->sql_like('f.filename', ':query', false);
$sql = "SELECT $select
FROM {files} f
LEFT JOIN {files_reference} r
ON f.referencefileid = r.id
JOIN {context} c
ON f.contextid = c.id
WHERE c.contextlevel <> :contextlevel
AND f.filename <> :directory
AND " . $like . "";
if ($count) {
return $DB->count_records_sql($sql, $params);
}
$sql .= " ORDER BY f.filename";
$result = array();
$filerecords = $DB->get_recordset_sql($sql, $params, $from, $limit);
foreach ($filerecords as $filerecord) {
$result[$filerecord->pathnamehash] = $this->get_file_instance($filerecord);
}
$filerecords->close();
return $result;
}
/**
* Returns all aliases that refer to some stored_file via the given reference
*
* All repositories that provide access to a stored_file are expected to use
* {@link self::pack_reference()}. This method can't be used if the given reference
* does not use this format or if you are looking for references to an external file
* (for example it can't be used to search for all aliases that refer to a given
* Dropbox or Box.net file).
*
* Aliases in user draft areas are excluded from the returned list.
*
* @param string $reference identification of the referenced file
* @return array of stored_file indexed by its pathnamehash
*/
public function search_references($reference) {
global $DB;
if (is_null($reference)) {
throw new coding_exception('NULL is not a valid reference to an external file');
}
// Give {@link self::unpack_reference()} a chance to throw exception if the
// reference is not in a valid format.
self::unpack_reference($reference);
$referencehash = sha1($reference);
$sql = "SELECT ".self::instance_sql_fields('f', 'r')."
FROM {files} f
JOIN {files_reference} r ON f.referencefileid = r.id
JOIN {repository_instances} ri ON r.repositoryid = ri.id
WHERE r.referencehash = ?
AND (f.component <> ? OR f.filearea <> ?)";
$rs = $DB->get_recordset_sql($sql, array($referencehash, 'user', 'draft'));
$files = array();
foreach ($rs as $filerecord) {
$files[$filerecord->pathnamehash] = $this->get_file_instance($filerecord);
}
return $files;
}
/**
* Returns the number of aliases that refer to some stored_file via the given reference
*
* All repositories that provide access to a stored_file are expected to use
* {@link self::pack_reference()}. This method can't be used if the given reference
* does not use this format or if you are looking for references to an external file
* (for example it can't be used to count aliases that refer to a given Dropbox or
* Box.net file).
*
* Aliases in user draft areas are not counted.
*
* @param string $reference identification of the referenced file
* @return int
*/
public function search_references_count($reference) {
global $DB;
if (is_null($reference)) {
throw new coding_exception('NULL is not a valid reference to an external file');
}
// Give {@link self::unpack_reference()} a chance to throw exception if the
// reference is not in a valid format.
self::unpack_reference($reference);
$referencehash = sha1($reference);
$sql = "SELECT COUNT(f.id)
FROM {files} f
JOIN {files_reference} r ON f.referencefileid = r.id
JOIN {repository_instances} ri ON r.repositoryid = ri.id
WHERE r.referencehash = ?
AND (f.component <> ? OR f.filearea <> ?)";
return (int)$DB->count_records_sql($sql, array($referencehash, 'user', 'draft'));
}
/**
* Returns all aliases that link to the given stored_file
*
* Aliases in user draft areas are excluded from the returned list.
*
* @param stored_file $storedfile
* @return array of stored_file
*/
public function get_references_by_storedfile(stored_file $storedfile) {
global $DB;
$params = array();
$params['contextid'] = $storedfile->get_contextid();
$params['component'] = $storedfile->get_component();
$params['filearea'] = $storedfile->get_filearea();
$params['itemid'] = $storedfile->get_itemid();
$params['filename'] = $storedfile->get_filename();
$params['filepath'] = $storedfile->get_filepath();
return $this->search_references(self::pack_reference($params));
}
/**
* Returns the number of aliases that link to the given stored_file
*
* Aliases in user draft areas are not counted.
*
* @param stored_file $storedfile
* @return int
*/
public function get_references_count_by_storedfile(stored_file $storedfile) {
global $DB;
$params = array();
$params['contextid'] = $storedfile->get_contextid();
$params['component'] = $storedfile->get_component();
$params['filearea'] = $storedfile->get_filearea();
$params['itemid'] = $storedfile->get_itemid();
$params['filename'] = $storedfile->get_filename();
$params['filepath'] = $storedfile->get_filepath();
return $this->search_references_count(self::pack_reference($params));
}
/**
* Updates all files that are referencing this file with the new contenthash
* and filesize
*
* @param stored_file $storedfile
*/
public function update_references_to_storedfile(stored_file $storedfile) {
global $CFG, $DB;
$params = array();
$params['contextid'] = $storedfile->get_contextid();
$params['component'] = $storedfile->get_component();
$params['filearea'] = $storedfile->get_filearea();
$params['itemid'] = $storedfile->get_itemid();
$params['filename'] = $storedfile->get_filename();
$params['filepath'] = $storedfile->get_filepath();
$reference = self::pack_reference($params);
$referencehash = sha1($reference);
$sql = "SELECT repositoryid, id FROM {files_reference}
WHERE referencehash = ?";
$rs = $DB->get_recordset_sql($sql, array($referencehash));
$now = time();
foreach ($rs as $record) {
$this->update_references($record->id, $now, null,
$storedfile->get_contenthash(), $storedfile->get_filesize(), 0);
}
$rs->close();
}
/**
* Convert file alias to local file
*
* @throws moodle_exception if file could not be downloaded
*
* @param stored_file $storedfile a stored_file instances
* @param int $maxbytes throw an exception if file size is bigger than $maxbytes (0 means no limit)
* @return stored_file stored_file
*/
public function import_external_file(stored_file $storedfile, $maxbytes = 0) {
global $CFG;
$storedfile->import_external_file_contents($maxbytes);
$storedfile->delete_reference();
return $storedfile;
}
/**
* Return mimetype by given file pathname
*
* If file has a known extension, we return the mimetype based on extension.
* Otherwise (when possible) we try to get the mimetype from file contents.
*
* @param string $pathname full path to the file
* @param string $filename correct file name with extension, if omitted will be taken from $path
* @return string
*/
public static function mimetype($pathname, $filename = null) {
if (empty($filename)) {
$filename = $pathname;
}
$type = mimeinfo('type', $filename);
if ($type === 'document/unknown' && class_exists('finfo') && file_exists($pathname)) {
$finfo = new finfo(FILEINFO_MIME_TYPE);
$type = mimeinfo_from_type('type', $finfo->file($pathname));
}
return $type;
}
/**
* Cron cleanup job.
*/
public function cron() {
global $CFG, $DB;
require_once($CFG->libdir.'/cronlib.php');
// find out all stale draft areas (older than 4 days) and purge them
// those are identified by time stamp of the /. root dir
mtrace('Deleting old draft files... ', '');
cron_trace_time_and_memory();
$old = time() - 60*60*24*4;
$sql = "SELECT *
FROM {files}
WHERE component = 'user' AND filearea = 'draft' AND filepath = '/' AND filename = '.'
AND timecreated < :old";
$rs = $DB->get_recordset_sql($sql, array('old'=>$old));
foreach ($rs as $dir) {
$this->delete_area_files($dir->contextid, $dir->component, $dir->filearea, $dir->itemid);
}
$rs->close();
mtrace('done.');
// remove orphaned preview files (that is files in the core preview filearea without
// the existing original file)
mtrace('Deleting orphaned preview files... ', '');
cron_trace_time_and_memory();
$sql = "SELECT p.*
FROM {files} p
LEFT JOIN {files} o ON (p.filename = o.contenthash)
WHERE p.contextid = ? AND p.component = 'core' AND p.filearea = 'preview' AND p.itemid = 0
AND o.id IS NULL";
$syscontext = context_system::instance();
$rs = $DB->get_recordset_sql($sql, array($syscontext->id));
foreach ($rs as $orphan) {
$file = $this->get_file_instance($orphan);
if (!$file->is_directory()) {
$file->delete();
}
}
$rs->close();
mtrace('done.');
// remove trash pool files once a day
// if you want to disable purging of trash put $CFG->fileslastcleanup=time(); into config.php
if (empty($CFG->fileslastcleanup) or $CFG->fileslastcleanup < time() - 60*60*24) {
require_once($CFG->libdir.'/filelib.php');
// Delete files that are associated with a context that no longer exists.
mtrace('Cleaning up files from deleted contexts... ', '');
cron_trace_time_and_memory();
$sql = "SELECT DISTINCT f.contextid
FROM {files} f
LEFT OUTER JOIN {context} c ON f.contextid = c.id
WHERE c.id IS NULL";
$rs = $DB->get_recordset_sql($sql);
if ($rs->valid()) {
$fs = get_file_storage();
foreach ($rs as $ctx) {
$fs->delete_area_files($ctx->contextid);
}
}
$rs->close();
mtrace('done.');
mtrace('Deleting trash files... ', '');
cron_trace_time_and_memory();
fulldelete($this->trashdir);
set_config('fileslastcleanup', time());
mtrace('done.');
}
}
/**
* Get the sql formated fields for a file instance to be created from a
* {files} and {files_refernece} join.
*
* @param string $filesprefix the table prefix for the {files} table
* @param string $filesreferenceprefix the table prefix for the {files_reference} table
* @return string the sql to go after a SELECT
*/
private static function instance_sql_fields($filesprefix, $filesreferenceprefix) {
// Note, these fieldnames MUST NOT overlap between the two tables,
// else problems like MDL-33172 occur.
$filefields = array('contenthash', 'pathnamehash', 'contextid', 'component', 'filearea',
'itemid', 'filepath', 'filename', 'userid', 'filesize', 'mimetype', 'status', 'source',
'author', 'license', 'timecreated', 'timemodified', 'sortorder', 'referencefileid');
$referencefields = array('repositoryid' => 'repositoryid',
'reference' => 'reference',
'lastsync' => 'referencelastsync');
// id is specifically named to prevent overlaping between the two tables.
$fields = array();
$fields[] = $filesprefix.'.id AS id';
foreach ($filefields as $field) {
$fields[] = "{$filesprefix}.{$field}";
}
foreach ($referencefields as $field => $alias) {
$fields[] = "{$filesreferenceprefix}.{$field} AS {$alias}";
}
return implode(', ', $fields);
}
/**
* Returns the id of the record in {files_reference} that matches the passed repositoryid and reference
*
* If the record already exists, its id is returned. If there is no such record yet,
* new one is created (using the lastsync provided, too) and its id is returned.
*
* @param int $repositoryid
* @param string $reference
* @param int $lastsync
* @param int $lifetime argument not used any more
* @return int
*/
private function get_or_create_referencefileid($repositoryid, $reference, $lastsync = null, $lifetime = null) {
global $DB;
$id = $this->get_referencefileid($repositoryid, $reference, IGNORE_MISSING);
if ($id !== false) {
// bah, that was easy
return $id;
}
// no such record yet, create one
try {
$id = $DB->insert_record('files_reference', array(
'repositoryid' => $repositoryid,
'reference' => $reference,
'referencehash' => sha1($reference),
'lastsync' => $lastsync));
} catch (dml_exception $e) {
// if inserting the new record failed, chances are that the race condition has just
// occured and the unique index did not allow to create the second record with the same
// repositoryid + reference combo
$id = $this->get_referencefileid($repositoryid, $reference, MUST_EXIST);
}
return $id;
}
/**
* Returns the id of the record in {files_reference} that matches the passed parameters
*
* Depending on the required strictness, false can be returned. The behaviour is consistent
* with standard DML methods.
*
* @param int $repositoryid
* @param string $reference
* @param int $strictness either {@link IGNORE_MISSING}, {@link IGNORE_MULTIPLE} or {@link MUST_EXIST}
* @return int|bool
*/
private function get_referencefileid($repositoryid, $reference, $strictness) {
global $DB;
return $DB->get_field('files_reference', 'id',
array('repositoryid' => $repositoryid, 'referencehash' => sha1($reference)), $strictness);
}
/**
* Updates a reference to the external resource and all files that use it
*
* This function is called after synchronisation of an external file and updates the
* contenthash, filesize and status of all files that reference this external file
* as well as time last synchronised.
*
* @param int $referencefileid
* @param int $lastsync
* @param int $lifetime argument not used any more, liefetime is returned by repository
* @param string $contenthash
* @param int $filesize
* @param int $status 0 if ok or 666 if source is missing
*/
public function update_references($referencefileid, $lastsync, $lifetime, $contenthash, $filesize, $status) {
global $DB;
$referencefileid = clean_param($referencefileid, PARAM_INT);
$lastsync = clean_param($lastsync, PARAM_INT);
validate_param($contenthash, PARAM_TEXT, NULL_NOT_ALLOWED);
$filesize = clean_param($filesize, PARAM_INT);
$status = clean_param($status, PARAM_INT);
$params = array('contenthash' => $contenthash,
'filesize' => $filesize,
'status' => $status,
'referencefileid' => $referencefileid);
$DB->execute('UPDATE {files} SET contenthash = :contenthash, filesize = :filesize,
status = :status
WHERE referencefileid = :referencefileid', $params);
$data = array('id' => $referencefileid, 'lastsync' => $lastsync);
$DB->update_record('files_reference', (object)$data);
}
}
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