drbii0359
2016-01-06 01:16 阅读 69
已采纳

使用Laravel中的加密文件(如何下载解密文件)

In my webapp, users can upload files. Before being saved and stored, the contents of the file are encrypted using something like this:

Crypt::encrypt(file_get_contents($file->getRealPath()));

I then use the file system that comes with Laravel to move the file

Storage::put($filePath, $encryptedFile);

I have a table to store information about each file with columns such as:

  • id
  • file_path
  • file_name
  • original_name (includes the extension)

Now I want the user to be able to download this encrypted file. However, I'm having trouble decrypting the file and returning it to the user. In the file downloads response section of the Laravel documentation, it suggests to do this:

return response()->download($pathToFile, $name, $headers);

It wants a file path which is fine, but at which point can I decrypt the file contents so that it is actually readable?

I do seem to be able to do this:

$encryptedContents = Storage::get($fileRecord->file_path);
$decryptedContents = Crypt::decrypt($encryptedContents);

... but I don't know how to return it as a download with a specified file name.

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2条回答 默认 最新

  • 已采纳
    dongtangjie0495 dongtangjie0495 2016-01-06 01:35

    You could manually create the response like so:

    $encryptedContents = Storage::get($fileRecord->file_path);
    $decryptedContents = Crypt::decrypt($encryptedContents);
    
    return response()->make($decryptedContents, 200, array(
        'Content-Type' => (new finfo(FILEINFO_MIME))->buffer($decryptedContents),
        'Content-Disposition' => 'attachment; filename="' . pathinfo($fileRecord->file_path, PATHINFO_BASENAME) . '"'
    ));
    

    You can check out the Laravel API for more info on what the parameters of the make method are. The pathinfo function is also used to extract the filename from the path so it sends the correct filename with the response.

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  • dpb75177 dpb75177 2018-07-19 21:09

    Laravel 5.6 allows you to use streams for downloads: https://laravel.com/docs/5.6/responses#file-downloads

    So in your case:

    return $response()->streamDownload(function() use $decryptedContents {
        echo $decryptedContents;
    }, $fileName);
    
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