Block other sites from uploading my images

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How do I block other domains from uploading my images?

nginx

  • What you’re looking for is a way to ban Hotlinking, look for HTTP_REFERER, there are some techniques to avoid this.

1 answer

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A strategy for what you want, would create an intermediary page to load your images, with this you can detect the origin of the request, below I will put an example in PHP.

<?php
if(isset($_SERVER['HTTP_REFERER']) && strpos($_SERVER['HTTP_REFERER'], 'http://www.seusite.com.br') === 0 && isset($_GET['img'])){
    $name = './imagens/' . $_GET['img'];
    $fp = fopen($name, 'rb');

    header("Content-Type: " . mime_content_type($name));
    header("Content-Length: " . filesize($name));

    fpassthru($fp);
    exit;
}
?>

Example of a page using the image:

<img src="imagens.php?img=icone.jpg" />

To be more effect you have to block apache direct access to image folder and its files.

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