....................................../////.===Shadow-Here===./////................................................ > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < ------------------------------------------------------------------------------------------------------------------- /////////////////////////////////////////////////////////////////////////////////////////////////////////////////// RIFF¤ WEBPVP8 ˜ ðÑ *ôô>‘HŸK¥¤"§£±¨àð enü¹%½_F‘åè¿2ºQú³íªú`N¿­3ÿƒügµJžaÿ¯ÿ°~¼ÎùnúîÞÖô•òíôÁÉß®Sm¥Ü/ ‡ó˜f£Ùà<˜„xëJ¢Ù€SO3x<ªÔ©4¿+ç¶A`q@Ì“Úñè™ÍÿJÌ´ª-˜ÆtÊÛL]Ïq*‘Ý”ì#ŸÌÏãY]@ê`¿ /ªfkØB4·®£ó z—Üw¥Pxù–ÞLШKÇN¾AkÙTf½è'‰g gÆv›Øuh~ a˜Z— ïj*á¥t d£“uÒ ¨`K˜¹ßþ]b>˜]_ÏÔ6W—è2r4x•íÖ…"ƒÖNîä!¦å Ú}ýxGøÌ —@ ;ÆÚŠ=ɾ1ý8lªË¥ô ^yf®Œ¢u&2©nÙÇ›ñÂñŒ³ aPo['½»øFùà­+4ê“$!lövlüÞ=;N®3ð‚õ›DÉKòÞ>ÄÍ ¥ˆuߤ#ˆ$6ù™¥îŠ‡y’ÍB¼ çxÛ;X"WL£R÷͝*ó-¶Zu}º.s¸sšXqù–DþÿvªhüïwyŸ ¯é³lÀ:KCûÄ£Ëá\…­ ~—ýóî ¼ûûÜTÓüÇy…ŽÆvc»¾×U ñ¸žþоP÷¦ó:Ò¨¨5;Ð#&#ÖúñläÿÁœ GxÉ­/ñ‡áQðìYÉtÒwŽ¼GÔ´zàÒò ð*ëzƒ•4~H]Ø‹f ñÓÈñ`NåWçs'ÆÏW^ø¹!XžµmQ5ÃËoLœÎ: ÞËÍ¥J ù…î èo£ßPÎñ¶ž8.Œ]ʵ~5›ÙË-ù*8ÙÖß±~ ©¹rÓê‚j¶d¸{^Q'˜±Crß ÚH—#¥¥QlÀ×ëã‡DÜ«èî þ&Çæžî;ŽÏºò6ÒLÃXy&ZŒ'j‚¢Ù€IßÚù+–MGi‰*jE€‘JcÜ ÓÌ EÏÚj]o˜ Þr <¾U ûŪæÍ/šÝH¥˜b”¼ ÁñßX GP›ï2›4WŠÏà×£…íÓk†¦H·ÅíMh–*nó÷à]ÁjCº€b7<ب‹¨5車bp2:Á[UªM„QŒçiNMa#<5›áËó¸HýÊ"…×Éw¹¦ì2º–x<›»a±¸3Weü®FÝ⑱ö–î–³|LPÈ~çð~Çå‡|º kD¢µÏàÆAI %1À% ¹Ò – ”ϝS¦‰4&¶£°à Öý”û_Ò Áw°A«Å€?mÇÛgHÉ/8)á¾ÛìáöŽP í¨PŸNÙµº¦‡§Ùš"ÿ«>+ªÕ`Ê÷‡‚ß Õû˜þãÇ-PÍ.¾XV‘€ dÜ"þ4¹ ±Oú‘©t¥¦FªÄÃÄ•b‚znýu½—#cDs˜ÃiÑOˆñ×QO=*IAÊ,¶ŽZƒ;‡wøXè%EÐk:F±Ú” .Ѽ+Áu&Ç`."pÈÉw o&¿dE6‘’EqTuK@Ì¥ã™À(Êk(h‰,H}RÀIXÛš3µ1©_OqÚÒJAñ$ÊÙÜ;D3çŒ[þùœh¬Ã³™ö6ç†NY".Ú‰ï[ªŸŒ '²Ð öø_¨ÂÉ9u鶳ÒŠõTàîMØ#û¯gN‡bÙ놚X„ö …ÉeüÌ^J ‹€.œ$Æ)βÄeæW#óüßĺŸ€ ÀzwV 9oä»f4V*uB «Ë†¹ì¯žR霓æHXa=&“I4K;¯ç‹h×·"UŠ~<•â•ªVêª&ÍSÃÆÅ?ÔqÎ*mTM ˜›µwêd#[C¡©§‘D<©àb†–ÁœøvH/,í:¯( ²£|4-„Æövv„Yͼ™^Á$ˆ„¢Û[6yB.åH*V¨æ?$=˜Ñ€•î¦ñ·­(VlŸ‘ nÀt8W÷´Bûba?q9ú¶Xƒl«ÿ\ù¶’þòUÐj/õ¢Ìµ³g$ƒÎR!¸»|Oߍë’BhîÚÑ¢ñåŒJ„®„£2Ð3•ô02Nt…!£Í]Ïc½Qÿ?ˆ<&ÃA¾Ú,JˆijÌ#5yz„‰Î|ÊŽ5QÏ:‹ÐaóVÔxW—CpeÏzÐïíçôÿÅ_[hãsÐ_/ŽTÝ?BîˆííV$<¿i>²F¬_Eß¿ †bÊŒº­ÿ®Z H“C}”¬,Mp ý/Bá£w>˜YV°aƒúh+cŠ- r/[%|üUMHäQ°X»|û/@|°¥Ð !BÔ Ç¢Ä©š+Õì D«7ìN¶ŽðÔ " ƶ’ÖçtA‰Û×}{tþz­¾GÍ›k¹OEJR$ Â׃ «ëÁ"oÉôž$oUK(Ä)Ãz³Ê-‹êN[Ò3Œñbï8P 4ƒ×q¢bo|?<ÛX¬òÄÍ°L–±›(™ûG?ýË©ÚÄ–ÂDØÐ_Ç¡ô ¾–ÄÏø ×e8Ë©$ÄF¹Å‹ì[©óìl:F¾f´‹‹Xì²ï®\¬ôùƒ ÿat¥óèÒùHß0äe‚;ü×h:ÆWðHž=Ã8骣"kœ'Y?³}Tûè€>?0l›e1Lòñ„aæKÆw…hÖŠùW…ÈÆÄ0ši·›[pcwËþñiêíY/~-Á5˜!¿†A›™Mÿþ(±“t@â“ö2­´TG5yé]çå僳 .·ÍïçÝ7UÚ±Ð/Nè»,_Ï ùdj7\ï Wì4›„»c¸àešg#ÒÊ⥭áØo5‘?ÌdÝô¯ ¹kzsƒ=´#ëÉK›Ø´±-¥eW?‡çßtòTã…$Ý+qÿ±ƒ÷_3Ô¥í÷:æ–ž<·Ö‡‰Å¢ š‡%Ô—utÌÈìðžgÖÀz²À—ï÷Óîäõ{K'´È÷³yaÏÁjƒô}ž§®æÊydÕÈë5¯èˆõvÕ©ã*çD„ “z„Ó‡^^xÂ3M§A´JG‚öï 3W'ˆ.OvXè¡ÊÕª?5º7†˜(˜Ç¶#çê’¶!ÌdZK§æ 0fãaN]òY³RV ™î$®K2R¨`W!1Ôó\;Ý ýB%qæK•&ÓÈe9È0êI±žeŸß -ú@žQr¦ ö4»M¼Áè¹µmw 9 EÆE_°2ó„ŸXKWÁ×Hóì^´²GѝF©óäR†¦‰ç"V»eØ<3ùd3ÿÚ¤Žú“Gi" —‘_ÙËÎ~Üö¯¥½Î»üŸEÚŽåmÞþí ;ÞólËΦMzA"Âf(´òá;Éï(/7½ûñÌ­cïÕçлþÝz¾-ÍvÑ“pH­–ðÓj$¸Äû¤‚‘ãUBË-n“2åPkS5&‹Â|+g^œ®Ì͆d!OïäîU«c;{Û!ÅŽ«ëZ9Ókóˆ]¯ƒ›né `ÇÒ+tÆš (ØKá¾—=3œ®•vuMñg²\ï Ec€ 05±d™‡×iÇ×›UúvÌ¢£Èþ¡ÕØô¶ßÎA"ß±#Ö²ˆÊŸ¦*Ä~ij|àø.-¼'»Ú¥£h ofº¦‡VsR=N½„Î v˜Z*SÌ{=jÑB‹tê…;’HžH¯8–îDù8ñ¢|Q•bÛçš–‹m³“ê¨ åÏ^m¬Žãþ©ïêO‡½6] µÆ„Ooòü ²x}N¦Ë3ïé¿»€›HA˜m%çÞ/¿í7Fø“‹léUk)É°Œµ8Q8›:ÀŠeT*šõ~ôڝG6 ¢}`ùH­–”¡k ‰P1>š†®9z11!X wKfmÁ¦xÑ,N1Q”–æB¶M…ÒÃv6SMˆhU¬ÊPŽï‘öj=·CŒ¯u¹ƒVIЃsx4’ömÛýc塶7ßŠß 57^\wÒÐÆ k§h,Œý î«q^R½3]J¸ÇðN ‚çU¬ôº^Áì} ³f©Õœ§ˆã:FÄÈ‚é(€™?àýÓüè1Gô£¼éj‚OÅñ  #>×—ßtà 0G¥Åa뀐kßhc™À_ÉñÞ#±)GD" YîäË-ÿÙ̪ ¹™a¯´¢E\ÝÒö‚;™„ë]_ p8‰o¡ñ+^÷ 3‘'dT4œŽ ðVë½° :¬víÑ«£tßÚS-3¶“þ2 †üüʨòrš¹M{É_¤`Û¨0ìjœøJ‡:÷ÃáZ˜†@GP&œÑDGÏs¡þ¦þDGú‘1Yá9Ôþ¼ ûø…§÷8&–ÜÑnÄ_m®^üÆ`;ÉVÁJ£?â€-ßê}suÍ2sõA NÌúA磸‘îÿÚ»ƒìö·á¿±tÑÐ"Tÿü˜[@/äj¬€uüªìù¥Ý˜á8Ý´sõj 8@rˆð äþZÇD®ÿUÏ2ùôõrBzÆÏÞž>Ì™xœ“ wiÎ×7_… ¸ \#€MɁV¶¥üÕÿPÔ9Z‡ø§É8#H:ƒ5ÀÝå9ÍIŒ5åKÙŠ÷qÄ>1AÈøžj"µÂд/ªnÀ qªã}"iŸBå˜ÓÛŽ¦…&ݧ;G@—³b¯“•"´4í¨ôM¨åñC‹ïùÉó¯ÓsSH2Ý@ßáM‡ˆKÀªÛUeø/4\gnm¥‹ŸŒ qÄ b9ÞwÒNÏ_4Ég³ú=܆‚´ •â¥õeíþkjz>éÚyU«Íӝ݃6"8/ø{=Ô¢»G¥ äUw°W«,ô—¿ãㆅү¢³xŠUû™yŒ (øSópÐ 9\åTâ»—*oG$/×ÍT†Y¿1¤Þ¢_‡ ¼ „±ÍçèSaÓ 3ÛMÁBkxs‰’R/¡¤ˆÙçª(*õ„üXÌ´ƒ E§´¬EF"Ù”R/ÐNyÆÂ^°?™6¡œïJ·±$§?º>ÖüœcNÌù¯G ‹ñ2ŠBB„^·úìaz¨k:#¨Æ¨8LÎõލ£^§S&cŒÐU€ü(‡F±Š¼&P>8ÙÁ ‰ p5?0ÊƃZl¸aô š¼¡}gÿ¶zÆC²¹¬ÎÖG*HB¡O<º2#ñŒAƒ–¡B˜´É$¥›É:FÀÔx¾u?XÜÏÓvN©RS{2ʈãk9rmP¼Qq̳ è¼ÐFׄ^¡Öì fE“F4A…!ì/…¦Lƒ… … $%´¾yã@CI¬ á—3PþBÏNÿ<ý°4Ü ËÃ#ØÍ~âW«rEñw‹eùMMHß²`¬Öó½íf³:‹k˜¯÷}Z!ã¿<¥,\#öµÀ¯aÒNÆIé,Ћ–lŽ#Àæ9ÀÒS·I’½-Ïp Äz¤Š Â* ­íÄ9­< h>׍3ZkËU¹§˜ŒŠ±f­’¤º³Q ÏB?‹#µíÃ¥®@(Gs«†vI¥Mµ‹Á©e~2ú³ÁP4ìÕi‚²Ê^ö@-DþÓàlÜOÍ]n"µã:žpsŽ¢:! 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Current File : /var/www/html/formation/lib/filestorage/file_system_filedir.php
<?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 system class definition.
 *
 * @package   core_files
 * @copyright 2017 Andrew Nicols <andrew@nicols.co.uk>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

/**
 * File system class used for low level access to real files in filedir.
 *
 * @package   core_files
 * @category  files
 * @copyright 2017 Andrew Nicols <andrew@nicols.co.uk>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class file_system_filedir extends file_system {

    /**
     * @var string The path to the local copy of the filedir.
     */
    protected $filedir = null;

    /**
     * @var string The path to the trashdir.
     */
    protected $trashdir = null;

    /**
     * @var string Default directory permissions for new dirs.
     */
    protected $dirpermissions = null;

    /**
     * @var string Default file permissions for new files.
     */
    protected $filepermissions = null;


    /**
     * Perform any custom setup for this type of file_system.
     */
    public function __construct() {
        global $CFG;

        if (isset($CFG->filedir)) {
            $this->filedir = $CFG->filedir;
        } else {
            $this->filedir = $CFG->dataroot.'/filedir';
        }

        if (isset($CFG->trashdir)) {
            $this->trashdir = $CFG->trashdir;
        } else {
            $this->trashdir = $CFG->dataroot.'/trashdir';
        }

        $this->dirpermissions = $CFG->directorypermissions;
        $this->filepermissions = $CFG->filepermissions;

        // Make sure the file pool directory exists.
        if (!is_dir($this->filedir)) {
            if (!mkdir($this->filedir, $this->dirpermissions, true)) {
                // Permission trouble.
                throw new file_exception('storedfilecannotcreatefiledirs');
            }

            // 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', $this->filepermissions);
            }
        }

        // Make sure the trashdir directory exists too.
        if (!is_dir($this->trashdir)) {
            if (!mkdir($this->trashdir, $this->dirpermissions, true)) {
                // Permission trouble.
                throw new file_exception('storedfilecannotcreatefiledirs');
            }
        }
    }

    /**
     * Get the full path for the specified hash, including the path to the filedir.
     *
     * @param string $contenthash The content hash
     * @param bool $fetchifnotfound Whether to attempt to fetch from the remote path if not found.
     * @return string The full path to the content file
     */
    protected function get_local_path_from_hash($contenthash, $fetchifnotfound = false) {
        return $this->get_fulldir_from_hash($contenthash) . '/' .$contenthash;
    }

    /**
     * Get a remote filepath for the specified stored file.
     *
     * @param stored_file $file The file to fetch the path for
     * @param bool $fetchifnotfound Whether to attempt to fetch from the remote path if not found.
     * @return string The full path to the content file
     */
    public function get_local_path_from_storedfile(stored_file $file, $fetchifnotfound = false) {
        $filepath = $this->get_local_path_from_hash($file->get_contenthash(), $fetchifnotfound);

        // Try content recovery.
        if ($fetchifnotfound && !is_readable($filepath)) {
            $this->recover_file($file);
        }

        return $filepath;
    }

    /**
     * Get a remote filepath for the specified stored file.
     *
     * @param stored_file $file The file to serve.
     * @return string full path to pool file with file content
     */
    public function get_remote_path_from_storedfile(stored_file $file) {
        return $this->get_local_path_from_storedfile($file, false);
    }

    /**
     * Get the full path for the specified hash, including the path to the filedir.
     *
     * @param string $contenthash The content hash
     * @return string The full path to the content file
     */
    protected function get_remote_path_from_hash($contenthash) {
        return $this->get_local_path_from_hash($contenthash, false);
    }

    /**
     * Get the full directory to the stored file, including the path to the
     * filedir, and the directory which the file is actually in.
     *
     * Note: This function does not ensure that the file is present on disk.
     *
     * @param stored_file $file The file to fetch details for.
     * @return string The full path to the content directory
     */
    protected function get_fulldir_from_storedfile(stored_file $file) {
        return $this->get_fulldir_from_hash($file->get_contenthash());
    }

    /**
     * Get the full directory to the stored file, including the path to the
     * filedir, and the directory which the file is actually in.
     *
     * @param string $contenthash The content hash
     * @return string The full path to the content directory
     */
    protected function get_fulldir_from_hash($contenthash) {
        return $this->filedir . '/' . $this->get_contentdir_from_hash($contenthash);
    }

    /**
     * Get the content directory for the specified content hash.
     * This is the directory that the file will be in, but without the
     * fulldir.
     *
     * @param string $contenthash The content hash
     * @return string The directory within filedir
     */
    protected function get_contentdir_from_hash($contenthash) {
        $l1 = $contenthash[0] . $contenthash[1];
        $l2 = $contenthash[2] . $contenthash[3];
        return "$l1/$l2";
    }

    /**
     * Get the content path for the specified content hash within filedir.
     *
     * This does not include the filedir, and is often used by file systems
     * as the object key for storage and retrieval.
     *
     * @param string $contenthash The content hash
     * @return string The filepath within filedir
     */
    protected function get_contentpath_from_hash($contenthash) {
        return $this->get_contentdir_from_hash($contenthash) . '/' . $contenthash;
    }

    /**
     * Get the full directory for the specified hash in the trash, including the path to the
     * trashdir, and the directory which the file is actually in.
     *
     * @param string $contenthash The content hash
     * @return string The full path to the trash directory
     */
    protected function get_trash_fulldir_from_hash($contenthash) {
        return $this->trashdir . '/' . $this->get_contentdir_from_hash($contenthash);
    }

    /**
     * Get the full path for the specified hash in the trash, including the path to the trashdir.
     *
     * @param string $contenthash The content hash
     * @return string The full path to the trash file
     */
    protected function get_trash_fullpath_from_hash($contenthash) {
        return $this->trashdir . '/' . $this->get_contentpath_from_hash($contenthash);
    }

    /**
     * Copy content of file to given pathname.
     *
     * @param stored_file $file The file to be copied
     * @param string $target real path to the new file
     * @return bool success
     */
    public function copy_content_from_storedfile(stored_file $file, $target) {
        $source = $this->get_local_path_from_storedfile($file, true);
        return copy($source, $target);
    }

    /**
     * Tries to recover missing content of file from trash.
     *
     * @param stored_file $file stored_file instance
     * @return bool success
     */
    protected function recover_file(stored_file $file) {
        $contentfile = $this->get_local_path_from_storedfile($file, false);

        if (file_exists($contentfile)) {
            // The file already exists on the file system. No need to recover.
            return true;
        }

        $contenthash = $file->get_contenthash();
        $contentdir = $this->get_fulldir_from_storedfile($file);
        $trashfile = $this->get_trash_fullpath_from_hash($contenthash);
        $alttrashfile = "{$this->trashdir}/{$contenthash}";

        if (!is_readable($trashfile)) {
            // The trash file was not found. Check the alternative trash file too just in case.
            if (!is_readable($alttrashfile)) {
                return false;
            }
            // The alternative trash file in trash root exists.
            $trashfile = $alttrashfile;
        }

        if (filesize($trashfile) != $file->get_filesize() or file_storage::hash_from_path($trashfile) != $contenthash) {
            // The files are different. Leave this one in trash - something seems to be wrong with it.
            return false;
        }

        if (!is_dir($contentdir)) {
            if (!mkdir($contentdir, $this->dirpermissions, true)) {
                // Unable to create the target directory.
                return false;
            }
        }

        // Perform a rename - these are generally atomic which gives us big
        // performance wins, especially for large files.
        return rename($trashfile, $contentfile);
    }

    /**
     * Marks pool file as candidate for deleting.
     *
     * @param string $contenthash
     */
    public function remove_file($contenthash) {
        if (!self::is_file_removable($contenthash)) {
            // Don't remove the file - it's still in use.
            return;
        }

        if (!$this->is_file_readable_remotely_by_hash($contenthash)) {
            // The file wasn't found in the first place. Just ignore it.
            return;
        }

        $trashpath  = $this->get_trash_fulldir_from_hash($contenthash);
        $trashfile  = $this->get_trash_fullpath_from_hash($contenthash);
        $contentfile = $this->get_local_path_from_hash($contenthash, true);

        if (!is_dir($trashpath)) {
            mkdir($trashpath, $this->dirpermissions, true);
        }

        if (file_exists($trashfile)) {
            // A copy of this file is already in the trash.
            // Remove the old version.
            unlink($contentfile);
            return;
        }

        // Move the contentfile to the trash, and fix permissions as required.
        rename($contentfile, $trashfile);

        // Fix permissions, only if needed.
        $currentperms = octdec(substr(decoct(fileperms($trashfile)), -4));
        if ((int)$this->filepermissions !== $currentperms) {
            chmod($trashfile, $this->filepermissions);
        }
    }

    /**
     * Cleanup the trash directory.
     */
    public function cron() {
        $this->empty_trash();
    }

    protected function empty_trash() {
        fulldelete($this->trashdir);
        set_config('fileslastcleanup', time());
    }

    /**
     * Add the supplied file to the file system.
     *
     * Note: If overriding this function, it is advisable to store the file
     * in the path returned by get_local_path_from_hash as there may be
     * subsequent uses of the file in the same request.
     *
     * @param string $pathname Path to file currently on disk
     * @param string $contenthash SHA1 hash of content if known (performance only)
     * @return array (contenthash, filesize, newfile)
     */
    public function add_file_from_path($pathname, $contenthash = null) {

        list($contenthash, $filesize) = $this->validate_hash_and_file_size($contenthash, $pathname);

        $hashpath = $this->get_fulldir_from_hash($contenthash);
        $hashfile = $this->get_local_path_from_hash($contenthash, false);

        $newfile = true;

        $hashsize = self::check_file_exists_and_get_size($hashfile);
        if ($hashsize !== null) {
            if ($hashsize === $filesize) {
                return array($contenthash, $filesize, false);
            }
            if (file_storage::hash_from_path($hashfile) === $contenthash) {
                // Jackpot! We have a hash collision.
                mkdir("$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.

        $prev = ignore_user_abort(true);
        if (file_exists($hashfile.'.tmp')) {
            @unlink($hashfile.'.tmp');
        }
        if (!copy($pathname, $hashfile.'.tmp')) {
            // Borked permissions or out of disk space.
            @unlink($hashfile.'.tmp');
            ignore_user_abort($prev);
            throw new file_exception('storedfilecannotcreatefile');
        }
        if (file_storage::hash_from_path($hashfile.'.tmp') !== $contenthash) {
            // Highly unlikely edge case, but this can happen on an NFS volume with no space remaining.
            @unlink($hashfile.'.tmp');
            ignore_user_abort($prev);
            throw new file_exception('storedfilecannotcreatefile');
        }
        if (!rename($hashfile.'.tmp', $hashfile)) {
            // Something very strange went wrong.
            @unlink($hashfile . '.tmp');
            // Note, we don't try to clean up $hashfile. Almost certainly, if it exists
            // (e.g. written by another process?) it will be right, so don't wipe it.
            ignore_user_abort($prev);
            throw new file_exception('storedfilecannotcreatefile');
        }
        chmod($hashfile, $this->filepermissions); // Fix permissions if needed.
        if (file_exists($hashfile.'.tmp')) {
            // Just in case anything fails in a weird way.
            @unlink($hashfile.'.tmp');
        }
        ignore_user_abort($prev);

        return array($contenthash, $filesize, $newfile);
    }

    /**
     * Checks if the file exists and gets its size. This function avoids a specific issue with
     * networked file systems if they incorrectly report the file exists, but then decide it doesn't
     * as soon as you try to get the file size.
     *
     * @param string $hashfile File to check
     * @return int|null Null if the file does not exist, or the result of filesize(), or -1 if error
     */
    protected static function check_file_exists_and_get_size(string $hashfile): ?int {
        if (!file_exists($hashfile)) {
            // The file does not exist, return null.
            return null;
        }

        // In some networked file systems, it's possible that file_exists will return true when
        // the file doesn't exist (due to caching), but filesize will then return false because
        // it doesn't exist.
        $hashsize = @filesize($hashfile);
        if ($hashsize !== false) {
            // We successfully got a file size. Return it.
            return $hashsize;
        }

        // If we can't get the filesize, let's check existence again to see if we really
        // for sure think it exists.
        clearstatcache();
        if (!file_exists($hashfile)) {
            // The file doesn't exist any more, so return null.
            return null;
        }

        // It still thinks the file exists, but filesize failed, so we had better return an invalid
        // value for filesize.
        return -1;
    }

    /**
     * Add a file with the supplied content to the file system.
     *
     * Note: If overriding this function, it is advisable to store the file
     * in the path returned by get_local_path_from_hash as there may be
     * subsequent uses of the file in the same request.
     *
     * @param string $content file content - binary string
     * @return array (contenthash, filesize, newfile)
     */
    public function add_file_from_string($content) {
        global $CFG;

        $contenthash = file_storage::hash_from_string($content);
        // Binary length.
        $filesize = strlen($content ?? '');

        $hashpath = $this->get_fulldir_from_hash($contenthash);
        $hashfile = $this->get_local_path_from_hash($contenthash, false);

        $newfile = true;

        $hashsize = self::check_file_exists_and_get_size($hashfile);
        if ($hashsize !== null) {
            if ($hashsize === $filesize) {
                return array($contenthash, $filesize, false);
            }
            if (file_storage::hash_from_path($hashfile) === $contenthash) {
                // Jackpot! We have a hash collision.
                mkdir("$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($prev);
            throw new file_exception('storedfilecannotcreatefile');
        }
        if (!rename($hashfile.'.tmp', $hashfile)) {
            // Something very strange went wrong.
            @unlink($hashfile . '.tmp');
            // Note, we don't try to clean up $hashfile. Almost certainly, if it exists
            // (e.g. written by another process?) it will be right, so don't wipe it.
            ignore_user_abort($prev);
            throw new file_exception('storedfilecannotcreatefile');
        }
        chmod($hashfile, $this->filepermissions); // Fix permissions if needed.
        if (file_exists($hashfile.'.tmp')) {
            // Just in case anything fails in a weird way.
            @unlink($hashfile.'.tmp');
        }
        ignore_user_abort($prev);

        return array($contenthash, $filesize, $newfile);
    }

}

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