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Is  there a way to add an exception to a prevent hotlinking RewriteCond?

Posted on 2010-08-24
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Last Modified: 2016-03-18
I would like to be able to use the images on the server for my constant contact email marketing account so that anything coming from http://campaign.constantcontact.com/ would be allowed.  Below is the code I'm using in my .htaccess file from the root of my site.

Thanks for the help
Jules
#Preventing hot linking of images and other file types
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?dc-acupuncture.com/.*$ [NC]
RewriteRule \.(gif|png|jpg|js|css)$ - [F]

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Question by:Jules Webb
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4 Comments
 
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Expert Comment

by:arober11
ID: 33525302
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Author Comment

by:Jules Webb
ID: 33525545
Hi arober11, thanks for your reply:-)

Do you mean add another RewriteCond under the dc-acupuncture?  Obviously I don't want to block my own site.  

Also I'm wondering what the *$ [NC] means and it's not included on the constant contact url.  Since the constant contact url ends up with a whole string of trailing characters. Here is an example from the most recent newsletter:
http://campaign.constantcontact.com/render?v=001IP2wby2XJMKBMVUHbqzukjHKoH2ZeCqa3rgXkiD15O__MsOf2vqTaxmIPQvrsHcFFkA0Elx-_mdWUOqmKdRJ8ewdVbf9Y6bCbExnSkhiW6O-MYb8KVr2gpHHew6O1nH7

And image links for some reason end up like this: http://ih.constantcontact.com/fs005/1103523274156/img/7.jpg even though within constant contact the link is to the website image folder.

I appreciate you taking the time to educate me a bit:-)
Jules
#Preventing hot linking of images and other file types
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?dc-acupuncture.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://campaign\.constantcontact\.com/
RewriteRule \.(gif|png|jpg|js|css)$ - [F]

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Accepted Solution

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arober11 earned 500 total points
ID: 33526795
If "dc-acupuncture.com" also requires access, then line could read:

RewriteCond %{HTTP_REFERER}   !(dc-acupuncture|campaign\.constantcontact)\.com/   [NC]

As to what ".*$ [NC]"  signifies, the:
.*$    asks it to allow anything else up to the end of the line, and is superfluous, as it will do that anyway.
[NC]  indicates it should ignore case (NO CASE Sensitivity].

see: http://httpd.apache.org/docs/current/mod/mod_rewrite.html
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Author Closing Comment

by:Jules Webb
ID: 33527039
Thank You Thank You! That worked perfectly.  And thanks for the mod_rewrite link!
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