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File: fstream.inc.php
<?php
/**
 * Copyright (C) 2014 Arie Nugraha (dicarve@gmail.com), Hendro Wicaksono (hendrowicaksono@gmail.com)
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

use Ramsey\Uuid\Uuid;

// be sure that this file not accessed directly
if (!defined('INDEX_AUTH')) {
  die("can not access this file directly");
} elseif (INDEX_AUTH != 1) {
  die("can not access this file directly");
}

if (isset($_POST['init'])) {
  echo base64_encode($_SESSION[$_POST['init']].$_POST['init']) ?? '';
  exit;
}

/* File Viewer */

// get file ID
$fileID = isset($_GET['fid']) ? (integer)$_GET['fid'] : 0;
// get biblioID
$biblioID = isset($_GET['bid']) ? (integer)$_GET['bid'] : 0;
$memberID = isset($_SESSION['mid']) ? $_SESSION['mid'] : 0;
$userID = isset($_SESSION['uid']) ? $_SESSION['uid'] : 0;

// query file to database
$sql_q = 'SELECT att.*, f.*, b.title FROM biblio_attachment AS att
  LEFT JOIN files AS f ON att.file_id=f.file_id
  LEFT JOIN biblio b on att.biblio_id = b.biblio_id
  WHERE att.file_id=' . $fileID . ' AND att.biblio_id=' . $biblioID . ' AND att.access_type=\'public\'';
$file_q = $dbs->query($sql_q);
$file_d = $file_q->fetch_assoc();

if ($file_q->num_rows > 0) {
  \SLiMS\Plugins::getInstance()->execute('fstream_all_before_download', ['data' => array('fileID' => $fileID, 'memberID' => $memberID, 'userID' => $userID, 'biblioID' => $biblioID, 'file_d' => $file_d)]);
  $file_loc_url = SWB . 'index.php?p=fstream&fid=' . $fileID . '&bid=' . $biblioID;
  $file_loc = REPOBS . ($file_d['file_dir'] ? $file_d['file_dir'] . '/' : '') . $file_d['file_name'];
  if (file_exists($file_loc)) {
    // check access limit
    if ($file_d['access_limit']) {
      if (utility::isMemberLogin()) {
        $allowed_mem_types = @unserialize($file_d['access_limit']);
        if (!in_array($_SESSION['m_member_type_id'], $allowed_mem_types)) {
          # Access to file restricted
          # Member logged in but doesnt have privilege to download
          header("location:index.php?p=error&errnum=601");
          exit();
        }
      } else {
        $referto = SWB . 'index.php?p=member&destination=index.php?p=fstream&fid=' . $fileID . '&bid=' . $biblioID;
        header("location:$referto");
        exit();
      }
    }
    if ($file_d['mime_type'] == 'application/pdf') {
      if ($sysconf['pdf']['viewer'] == 'pdfjs') {
        $file_loc_url = SWB . 'index.php?p=fstream-pdf&fid=' . $fileID . '&bid=' . $biblioID;
        $uuid = Uuid::uuid4()->toString();
        $_SESSION[$uuid] = base64_encode($file_d['file_key']??'');
        $loader_init = $uuid;
        \SLiMS\Plugins::getInstance()->execute('fstream_pdf_before_download', ['data' => array('fileID' => $fileID, 'memberID' => $memberID, 'userID' => $userID, 'biblioID' => $biblioID, 'file_d' => $file_d)]);

        if (utility::isMobileBrowser()) {
            require './js/pdfjs/mobile/index.php';
        } else {
            require './js/pdfjs/web/viewer.php';
        }

        \SLiMS\Plugins::getInstance()->execute('fstream_pdf_after_download', ['data' => array('fileID' => $fileID, 'memberID' => $memberID, 'userID' => $userID, 'biblioID' => $biblioID, 'file_d' => $file_d)]);
    		utility::dlCount($dbs, $fileID, $memberID, $userID);
        exit();
      }
    } else if (preg_match('@(image)/.+@i', $file_d['mime_type'])) {
      \SLiMS\Plugins::getInstance()->execute('fstream_img_before_download', ['data' => array('fileID' => $fileID, 'memberID' => $memberID, 'userID' => $userID, 'biblioID' => $biblioID, 'file_d' => $file_d)]);
	    utility::dlCount($dbs, $fileID, $memberID, $userID);
      header('Content-Disposition: inline; filename="' . basename($file_loc) . '"');
      header('Content-Type: ' . $file_d['mime_type']);
      echo file_get_contents($file_loc);
      \SLiMS\Plugins::getInstance()->execute('fstream_img_after_download', ['data' => array('fileID' => $fileID, 'memberID' => $memberID, 'userID' => $userID, 'biblioID' => $biblioID, 'file_d' => $file_d)]);
      exit();
    } else {
      if (strpos($file_d['mime_type'], 'video') !== false) {
        require_once LIB . 'VideoStream.php';
        $stream = new VideoStream($file_loc, $file_d['mime_type']);
        $stream->start();
      } else {
        \SLiMS\Plugins::getInstance()->execute('fstream_oth_before_download', ['data' => array('fileID' => $fileID, 'memberID' => $memberID, 'userID' => $userID, 'biblioID' => $biblioID, 'file_d' => $file_d)]);
        header('Content-Disposition: Attachment; filename="' . basename($file_loc) . '"');
        header('Content-Type: ' . $file_d['mime_type']);
        echo file_get_contents($file_loc);
        \SLiMS\Plugins::getInstance()->execute('fstream_oth_after_download', ['data' => array('fileID' => $fileID, 'memberID' => $memberID, 'userID' => $userID, 'biblioID' => $biblioID, 'file_d' => $file_d)]);
      }
      exit();
    }
  }
  #exit();
} else {
  die('<div class="errorBox">File Not Found!</div>');
}