getimagesize()在流而不是字符串

Question

我正在使用Valum的文件上传器用 AJAX上传图像.这个脚本以我不完全理解的方式将文件提交给我的服务器,因此最好通过显示我的服务器端代码来解释:

$pathToFile = $path . $filename;

//Here I get a file not found error, because the file is not yet at this address
getimagesize($pathToFile);

$input = fopen('php://input', 'r');
$temp = tmpfile();
$realSize = stream_copy_to_stream($input, $temp);

//Here I get a string expected, resource given error 
getimagesize($input);

fclose($input);

$target = fopen($pathToFile, 'w');
fseek($temp, 0, SEEK_SET);

//Here I get a file not found error, because the image is not at the $target yet
getimagesize($pathToFile);

stream_copy_to_stream($temp, $target);
fclose($target);

//Here it works, because the image is at the desired location so I'm able to access it with $pathToFile. However, the (potentially) malicious file is already in my server.
getimagesize($pathToFile);

问题是我想在这里使用getimagesize()执行一些文件验证.getimagesize只支持一个字符串,我只有资源可用,这导致错误:getimagesize需要一个字符串,给定资源.

当我在脚本结束时执行getimagesize($ pathTofile)时它确实有效,但是图像已经上传并且损坏已经完成了.执行此操作并在之后执行检查然后可能删除te文件对我来说似乎是不好的做法.

$ _REQUEST中唯一的东西是文件名,我用它来var $ pathToFile.$ _FILES是空的.

如何在流上执行文件验证？

编辑: 解决方案是首先将文件放在临时目录中,然后在临时文件上执行验证,然后再将其复制到目标目录.

// Store the file in tmp dir, to validate it before storing it in destination dir
$input = fopen('php://input', 'r');
$tmpPath = tempnam(sys_get_temp_dir(), 'upl'); // upl is 3-letter prefix for upload
$tmpStream = fopen($tmpPath, 'w'); // For writing it to tmp dir
stream_copy_to_stream($input, $tmpStream);
fclose($input);
fclose($tmpStream);

// Store the file in destination dir, after validation
$pathToFile = $path . $filename;
$destination = fopen($pathToFile, 'w');
$tmpStream = fopen($tmpPath, 'r'); // For reading it from tmp dir
stream_copy_to_stream($tmpStream, $destination);
fclose($destination);
fclose($tmpStream);

Answer 1

PHP 5.4现在支持 getimagesizefromstring

请参阅文档:http: //php.net/manual/pt_BR/function.getimagesizefromstring.php

你可以尝试:

$input = fopen('php://input', 'r');
$string = stream_get_contents($input);
fclose($input);

getimagesizefromstring($string);

Answer 2

tmpfile()您可以使用tempnam()andsys_get_temp_dir()创建临时路径，而不是使用。

然后使用fopen()它来获取它的句柄，复制流。

然后你就得到了一个字符串和一个用于你需要执行的操作的句柄。

//Copy PHP's input stream data into a temporary file

$inputStream   = fopen('php://input', 'r');
$tempDir       = sys_get_temp_dir();
$tempExtension = '.upload';

$tempFile   = tempnam($tempDir, $tempExtension);
$tempStream = fopen($tempFile, "w");
$realSize   = stream_copy_to_stream($inputStream, $tempStream);

fclose($tempStream);

getimagesize($tempFile);