简易防盗链

Prevent_hotlinking.php

<?php
$name = $_GET['n']; //获取文件名
$Extension = substr(strrchr($name, "."), 1);    //获取格式名

$Pictures = array("png","jpg","jpeg","gif","svg");
$Audios = array("mp3","m4v","m4a","wav","mpa");
$Videos = array("mp4","mov","ogv","ogg","webm");

if (in_array($Extension,$Videos)) { //判断格式设置对应文件夹
    $Folder = "videos/";
} else if(in_array($Extension,$Audios)) {
    $Folder = "audios/";
} else if($Extension === "zip") {
    $Folder = "archive/";
} else if(in_array($Extension,$Pictures)) {
    $Folder = "images/";
} else {
    # code...
}

$url = $Folder.$name.".".$Extension;    //完整路径
$save_name = "file.".$Extension;    //保存的文件名

// 检查文件是否存在
if(file_exists($url)) 
{  
    $file = @fopen($url,"r"); // 打开文件
    $file_data = fread($file,filesize($url));
    fclose($file);  
    // 输入文件标签 
    Header("Accept-Length: ".filesize($url));  
    if (in_array($Extension,$Videos)) { //声明文件头
        Header("Content-type: video/".$Extension); 
    } else if (in_array($Extension,$Audios)) {
        Header("Content-type: audio/".$Extension); 
    } else {
        Header("Content-type: application/octet-stream"); 
        Header("Accept-Ranges: bytes");
        Header("Content-Disposition: attachment; filename=".$save_name);
    }
    print_r($file_data);
    exit;
} else {
    header('HTTP/1.1 404 Not Found');
    header("status: 404 Not Found");
    Header("location: ../404.shtml");
    exit;  
}

?>