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Prevent hotlinking on images

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Adrian Ursu Dynamicweb Employee
Adrian Ursu
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Posted on 12/05/2022 16:33:03

Hi guys,

I have a B2C website that seems to be affected by spammy websites using their Image links as backlinks.

Is there any way I can prevent this? Some Robots rule or web.config or Url Rewrite?

Thank you,
Adrian


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Scott Forsyth Dynamicweb Employee
Scott Forsyth
Posted on 12/05/2022 17:40:29
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This post has been marked as an answer

Hi Adrian,

URL Rewrite is the way to go. Here's an example rule that I have for one of our projects. It looks like I planned for possible exceptions with the whitelist. You can leave that out if you don't have a need for it, or leave it in since it gives future flexibility. 

<rewrite>
<rewriteMaps>
<rewriteMap name="Hotlink Whitelist">
<add key="some-future-url.mydwsite2.com" value="allow" />
</rewriteMap>
</rewriteMaps>
<rules>
<rule name="Prevent Hotlinking" stopProcessing="true">
<match url="(?:jpg|jpeg|png|gif|bmp|GetImage.ashx)" />
<conditions trackAllCaptures="true">
<add input="{HTTP_REFERER}" pattern="^https?://(.+?)/.*$" />
<add input="{Hotlink Whitelist:{C:1}}" pattern="allow" negate="true" />
<add input="{HTTP_HOST}|{C:1}" pattern="([^\|]+)\|\1" negate="true" />
<add input="{REQUEST_FILENAME}" pattern="nohotlinking.jpg" negate="true" />
<add input="{HTTP_HOST}" pattern="(.*)" />
</conditions>
<action type="Redirect" url="https://{C:3}/files/images/nohotlinking.jpg" redirectType="Temporary" />
</rule>
</rules>
</rewrite>

Best Regards,

Scott
Votes for this answer: 1
 
Adrian Ursu Dynamicweb Employee
Adrian Ursu
Posted on 13/05/2022 08:56:08
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Hi Scott,

This is exactly what I was looking for.

Thank you very much.

Adrian

 

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