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Replacing Images With mod_rewrite

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How to replace images in the OpenGroupware UI using Apache's mod_rewrite so that you can customize the user interface without modifying the files installed by packages.

The key to using mod_rewrite to overload image references is that mod_rewrite supports the chaining of conditions [RewriteConf] so rewriting rules can only apply to certain requests.

Adding - RewriteEngine on RewriteCond %{REQUEST_FILENAME} \.(jpg|jpeg|gif|png)$ RewriteCond /srv/www/htdocs/override/%{REQUEST_FILENAME} -f RewriteRule ^(.+) /override/$1 [L] Order allow,deny Allow from all - to the vhost entry for our OpenGroupware instance and we can overload any reference to a request ending in jpg, jpeg, gif or png. But this only happens if a file of the same name exists in our overload directory.

So a request for - https://tor.morrison.iserv.net/OpenGroupware11.woa/WebServerResources/English.lproj/homepage2.gif - gets rewritten to - https://tor.morrison.iserv.net/override/OpenGroupware11.woa/WebServerResources/English.lproj/homepage2.gif - if and only if a file with a path and name of - /srv/www/htdocs/override/OpenGroupware11.woa/WebServerResources/English.lproj/homepage2.gif - exists. Otherwise the file is delivered from the usual place via the Alias directive in you ogo-webui.conf file included into your Apache configuration.

Alias /OpenGroupware11.woa/WebServerResources/ /usr/local/share/opengroupware.org-1.1/www/ Order allow,deny Allow from all

Created by whitemice
Last modified 2005-09-20 11:08 PM
 
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