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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 -
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} \.(jpg|jpeg|gif|png)$
RewriteCond /srv/www/htdocs/override/%{REQUEST_FILENAME} -f
RewriteRule ^(.+) /override/$1 [L]
</IfModule>
<Directory /srv/www/htdocs/override>
Order allow,deny
Allow from all
</Directory>
- to the vhost entry for our OpenGroupware instance and we can overload any reference to a request ending in jpg, jpeg, gif or png. But this only happens if a file of the same name exists in our overload directory.
So a request for -
https://tor.morrison.iserv.net/OpenGroupware11.woa/WebServerResources/English.lproj/homepage2.gif
- gets rewritten to -
https://tor.morrison.iserv.net/override/OpenGroupware11.woa/WebServerResources/English.lproj/homepage2.gif
- if and only if a file with a path and name of -
/srv/www/htdocs/override/OpenGroupware11.woa/WebServerResources/English.lproj/homepage2.gif
- exists. Otherwise the file is delivered from the usual place via the Alias directive in you ogo-webui.conf file included into your Apache configuration.
Alias /OpenGroupware11.woa/WebServerResources/ /usr/local/share/opengroupware.org-1.1/www/
<Directory /usr/local/share/opengroupware.org-1.1/www>
Order allow,deny
Allow from all
</Directory>
Adding -
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} \.(jpg|jpeg|gif|png)$
RewriteCond /srv/www/htdocs/override/%{REQUEST_FILENAME} -f
RewriteRule ^(.+) /override/$1 [L]
</IfModule>
<Directory /srv/www/htdocs/override>
Order allow,deny
Allow from all
</Directory>
- 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/
<Directory /usr/local/share/opengroupware.org-1.1/www>
Order allow,deny
Allow from all
</Directory>
