43 lines
1.3 KiB
PHP
43 lines
1.3 KiB
PHP
<?php
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session_start();
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// Allow legal person to download files instead of using direct URL access
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// Adapted from https://www.runoob.com/w3cnote/php-download-file.html
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// 修改这一行设置你的文件下载目录
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// IMPORTANT: Do not delete the following conditional test
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if (strpos($_GET['file'], "../") != false) { // 检查是否有 ../，防止用户构造路径，访问某个他不应该访问的目录
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die("Sorry. Nothing to download.");
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}
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$file = "./../../lrr_submission".$_GET['file'];
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$filename = basename($file);
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// 判断文件是否存在
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if(!file_exists($file)) die("File does not exist.");
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// 文件类型，作为头部发送给浏览器
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$type = filetype($file);
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// 获取时间和日期
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$today = date("F j, Y, g:i a");
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$time = time();
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if ((isset($_SESSION["user_student_id"]) && strpos($file, $_SESSION["user_student_id"]) > 0) || $_SESSION['user_type'] == "Lecturer" || $_SESSION['user_type'] == "TA" ) {
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// 发送文件头部
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header("Content-type: $type");
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header('Content-Disposition: attachment;filename="'.urldecode($filename).'"');
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header("Content-Transfer-Encoding: binary");
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header('Pragma: no-cache');
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header('Expires: 0');
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// 发送文件内容
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set_time_limit(0);
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readfile($file);
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} else {
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echo "Nothing to download. Contact lanhui _at_ zjnu.edu.cn if you think otherwise.";
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}
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?>
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